Author Archives: Srinivas Chakravarty

Bitcoin Mining: Researchers find it environmentally unsustainable, threat to future energy

Posted on by
Reply

Taken as a share of the market price, the climate change impacts of mining the digital cryptocurrency Bitcoin is more comparable to the impacts of extracting and refining crude oil than mining gold, according to an analysis published in Scientific Reports by researchers at The University of New Mexico.

The authors suggest that rather than being considered akin to ‘digital gold’, Bitcoin should instead be compared to much more energy-intensive products such as beef, natural gas, and crude oil.

“We find no evidence that Bitcoin mining is becoming more sustainable over time,” said UNM Economics Associate Professor Benjamin A. Jones. “Rather, our results suggest the opposite: Bitcoin mining is becoming dirtier and more damaging to the climate over time. In short, Bitcoin’s environmental footprint is moving in the wrong direction.”

In December 2021, Bitcoin had an approximately 960 billion US dollars market capitalization with a roughly 41 percent global market share among cryptocurrencies. Although known to be energy intensive, the extent of Bitcoin’s climate damages is unclear.

Researchers at The University of New Mexico find digital cryptocurrency Bitcoin is more comparable to the impacts of extracting and refining crude oil than mining gold./CREDIT:
University of New Mexico

Jones and colleagues Robert Berrens and Andrew Goodkind present economic estimates of climate damages from Bitcoin mining between January 2016 and December 2021. They report that in 2020 Bitcoin mining used 75.4 terawatt hours of electricity (TWh) – higher electricity usage than Austria (69.9 TWh) or Portugal (48.4 TWh) in that year.

“Globally, the mining, or production, of Bitcoin is using tremendous amounts of electricity, mostly from fossil fuels, such as coal and natural gas. This is causing huge amounts of air pollution and carbon emissions, which is negatively impacting our global climate and our health,” said Jones. “We find several instances between 2016-2021 where Bitcoin is more damaging to the climate than a single Bitcoin is actually worth. Put differently, Bitcoin mining, in some instances, creates climate damages in excess of a coin’s value. This is extremely troubling from a sustainability perspective.”

The authors assessed Bitcoin climate damages according to three sustainability criteria: whether the estimated climate damages are increasing over time; whether the climate damages of Bitcoin exceeds the market price; and how the climate damages as a share of market price compare to other sectors and commodities.

They find that the CO2 equivalent emissions from electricity generation for Bitcoin mining have increased 126-fold from 0.9 tonnes per coin in 2016, to 113 tonnes per coin in 2021. Calculations suggest each Bitcoin mined in 2021 generated 11,314 US Dollars (USD) in climate damages, with total global damages exceeding 12 billion USD between 2016 and 2021. Damages peaked at 156% of the coin price in May 2020, suggesting that each 1 USD of Bitcoin market value generated led to 1.56 USD in global climate damages that month.

“Across the class of digitally scarce goods, our focus is on those cryptocurrencies that rely on proof-of-work (POW) production techniques, which can be highly energy intensive,” said Regents Professor of Economics Robert Berrens. “Within broader efforts to mitigate climate change, the policy challenge is creating governance mechanisms for an emergent, decentralized industry, which includes energy-intensive POW cryptocurrencies. We believe that such efforts would be aided by measurable, empirical signals concerning potentially unsustainable climate damages, in monetary terms.”

Finally, the authors compared Bitcoin climate damages to damages from other industries and products such as electricity generation from renewable and non-renewable sources, crude oil processing, agricultural meat production, and precious metal mining. Climate damages for Bitcoin averaged 35% of its market value between 2016 and 2021. This share for Bitcoin was slightly less than the climate damages as a share of market value of electricity produced by natural gas (46%) and gasoline produced from crude oil (41%), but more than those of beef production (33%) and gold mining (4%).

The authors conclude that Bitcoin does not meet any of the three key sustainability criteria they assessed it against.  Absent voluntary switching away from proof-of-work mining, as very recently done for the cryptocurrency Ether, then potential regulation may be required to make Bitcoin mining sustainable.

Also Read:

Where do high-energy particles that endanger satellites, astronauts, airplanes come from?

Asian tiger mosquito, native to warm climate is now gaining ground in Illinois’s harsh winter

Soon new material to replace rogue plastic; It biodegrades in ocean water within 4 weeks

Webb Telescope, Hubble Telescope Capture Detailed images of DART Impact

Posted on by
Reply

Two of NASA’s Great Observatories, the James Webb Space Telescope and the Hubble Space Telescope, have captured views of a unique NASA experiment designed to intentionally smash a spacecraft into a small asteroid in the world’s first-ever in-space test for planetary defense. These observations of NASA’s Double Asteroid Redirection Test (DART) impact mark the first time that Webb and Hubble simultaneously observed the same celestial target.

On Sept. 26, 2022, at 7:14 pm EDT, DART intentionally crashed into Dimorphos, the asteroid moonlet in the double-asteroid system of Didymos. It was the world’s first test of the kinetic impact mitigation technique, using a spacecraft to deflect an asteroid that poses no threat to Earth, and modifying the object’s orbit. DART is a test for defending Earth against potential asteroid or comet hazards.

The coordinated Hubble and Webb observations are more than just an operational milestone for each telescope – there are also key science questions relating to the makeup and history of our solar system that researchers can explore when combining the capabilities of these observatories.

“Webb and Hubble show what we’ve always known to be true at NASA: We learn more when we work together,” said NASA Administrator Bill Nelson. “For the first time, Webb and Hubble have simultaneously captured imagery from the same target in the cosmos: an asteroid that was impacted by a spacecraft after a seven-million-mile journey. All of humanity eagerly awaits the discoveries to come from Webb, Hubble, and our ground-based telescopes – about the DART mission and beyond.”

Observations from Webb and Hubble together will allow scientists to gain knowledge about the nature of the surface of Dimorphos, how much material was ejected by the collision, and how fast it was ejected. Additionally, Webb and Hubble captured the impact in different wavelengths of light – Webb in infrared and Hubble in visible. Observing the impact across a wide array of wavelengths will reveal the distribution of particle sizes in the expanding dust cloud, helping to determine whether it threw off lots of big chunks or mostly fine dust. Combining this information, along with ground-based telescope observations, will help scientists to understand how effectively a kinetic impact can modify an asteroid’s orbit.

Webb Captures Impact Site Before and After Collision

Webb took one observation of the impact location before the collision took place, then several observations over the next few hours. Images from Webb’s Near-Infrared Camera (NIRCam) show a tight, compact core, with plumes of material appearing as wisps streaming away from the center of where the impact took place.

Observing the impact with Webb presented the flight operations, planning, and science teams with unique challenges, because of the asteroid’s speed of travel across the sky. As DART approached its target, the teams performed additional work in the weeks leading up to the impact to enable and test a method of tracking asteroids moving over three times faster than the original speed limit set for Webb.

“I have nothing but tremendous admiration for the Webb Mission Operations folks that made this a reality,” said principal investigator Cristina Thomas of Northern Arizona University in Flagstaff, Arizona. “We have been planning these observations for years, then in detail for weeks, and I’m tremendously happy this has come to fruition.”

Scientists also plan to observe the asteroid system in the coming months using Webb’s Mid-Infrared Instrument (MIRI) and Webb’s Near-Infrared Spectrograph (NIRSpec). Spectroscopic data will provide researchers with insight into the asteroid’s chemical composition.

Webb observed the impact over five hours total and captured 10 images. The data was collected as part of Webb’s Cycle 1 Guaranteed Time Observation Program 1245 led by Heidi Hammel of the Association of Universities for Research in Astronomy (AURA).

Hubble Images Show Movement of Ejecta After Impact

Hubble also captured observations of the binary system ahead of the impact, then again 15 minutes after DART hit the surface of Dimorphos. Images from Hubble’s Wide Field Camera 3 show the impact in visible light. Ejecta from the impact appear as rays stretching out from the body of the asteroid. The bolder, fanned-out spike of ejecta to the left of the asteroid is in the general direction from which DART approached.

Some of the rays appear to be curved slightly, but astronomers need to take a closer look to determine what this could mean. In the Hubble images, astronomers estimate that the brightness of the system increased by three times after impact, and saw that brightness hold steady, even eight hours after impact.

Description of the above images:  These images from NASA’s Hubble Space Telescope, taken (left to right) 22 minutes, 5 hours, and 8.2 hours after NASA’s Double Asteroid Redirection Test (DART) intentionally impacted Dimorphos, show expanding plumes of ejecta from the asteroid’s body. The Hubble images show ejecta from the impact that appear as rays stretching out from the body of the asteroid. The bolder, fanned-out spike of ejecta to the left of the asteroid is in the general direction from which DART approached. These observations, when combined with data from NASA’s James Webb Space Telescope, will allow scientists to gain knowledge about the nature of the surface of Dimorphos, how much material was ejected by the collision, how fast it was ejected, and the distribution of particle sizes in the expanding dust cloud.
Credits: Science: NASA, ESA, Jian-Yang Li (PSI); image processing: Alyssa Pagan (STScI)

Hubble plans to monitor the Didymos-Dimorphos system 10 more times over the next three weeks. These regular, relatively long-term observations as the ejecta cloud expands and fades over time will paint a more complete picture of the cloud’s expansion from the ejection to its disappearance.

“When I saw the data, I was literally speechless, stunned by the amazing detail of the ejecta that Hubble captured,” said Jian-Yang Li of the Planetary Science Institute in Tucson, Arizona, who led the Hubble observations. “I feel lucky to witness this moment and be part of the team that made this happen.”

Hubble captured 45 images in the time immediately before and following DART’s impact with Dimorphos. The Hubble data was collected as part of Cycle 29 General Observers Program 16674.

“This is an unprecedented view of an unprecedented event,” summarized Andy Rivkin, DART investigation team lead of the Johns Hopkins University Applied Physics Laboratory in Laurel, Maryland.

The James Webb Space Telescope is the world’s premier space science observatory. Webb will solve mysteries in our solar system, look beyond to distant worlds around other stars, and probe the mysterious structures and origins of our universe and our place in it. Webb is an international program led by NASA with its partners, ESA (European Space Agency) and CSA (Canadian Space Agency).

The Hubble Space Telescope is a project of international cooperation between NASA and ESA. NASA’s Goddard Space Flight Center in Greenbelt, Maryland, manages the telescope. The Space Telescope Science Institute (STScI) in Baltimore, Maryland, conducts Hubble and Webb science operations. STScI is operated for NASA by the Association of Universities for Research in Astronomy, in Washington, D.C.

Astronomers Detect Protective Shield Defending Pair of ‘Dwarf Galaxies’ with help of FUSE, Hubble

Posted on by
Reply

For billions of years, the Milky Way’s largest satellite galaxies – the Large and Small Magellanic Clouds – have followed a perilous journey. Orbiting one another as they are pulled in toward our home galaxy, they have begun to unravel, leaving behind trails of gaseous debris. And yet – to the puzzlement of astronomers – these dwarf galaxies remain intact, with ongoing vigorous star formation.

“A lot of people were struggling to explain how these streams of material could be there,” said Dhanesh Krishnarao, assistant professor at Colorado College. “If this gas was removed from these galaxies, how are they still forming stars?”

With the help of data from NASA’s Hubble Space Telescope and a retired satellite called the Far Ultraviolet Spectroscopic Explorer (FUSE), a team of astronomers led by Krishnarao has finally found the answer: the Magellanic system is surrounded by a corona, a protective shield of hot supercharged gas. This cocoons the two galaxies, preventing their gas supplies from being siphoned off by the Milky Way, and therefore allowing them to continue forming new stars.

Description of the above image:

Researchers have used spectroscopic observations of ultraviolet light from quasars to detect and map out the Magellanic Corona, a diffuse halo of hot, supercharged gas surrounding the Small and Large Magellanic Clouds. Shown here in purple, the corona stretches more than 100,000 light-years from the main mass of stars, gas, and dust that make up the Magellanic Clouds, intermingling with the hotter and more extensive corona that surrounds the Milky Way. The Magellanic Clouds, dwarf galaxies roughly 160,000 light-years from Earth, are the largest of the Milky Way’s satellites and are thought to be on their first in-falling passage around the Milky Way. This journey has begun to unravel what were once barred spirals with multiple arms into more irregular-shaped galaxies with long tails of debris. The corona is thought to act as a buffer protecting the dwarf galaxies’ vital star-forming gas from the gravitational pull of the much larger Milky Way. The detection of the Magellanic Corona was made by analyzing patterns in ultraviolet light from 28 distant background quasars. As the quasar light passes through the corona, certain wavelengths (colors) of ultraviolet light are absorbed. The quasar spectra become imprinted with the distinct signatures of carbon, oxygen, and silicon ions that make up the corona gas. Because each quasar probes a different part of the corona, the research team was also able to show that the amount of gas decreases with distance from the center of the Large Magellanic Cloud. This study used archival observations of quasars from Hubble’s Cosmic Origins Spectrograph (COS) and the Far Ultraviolet Spectroscopic Explorer (FUSE). Quasars have also been used to probe the Magellanic Stream, outflows from the Milky Way , and the halo surrounding the Andromeda Galaxy./Illustration Credits: STScI, Leah Hustak

 

This discovery, which was just published in Nature, addresses a novel aspect of galaxy evolution. “Galaxies envelope themselves in gaseous cocoons, which act as defensive shields against other galaxies,” said co-investigator Andrew Fox of the Space Telescope Science Institute in Baltimore, Maryland.

Astronomers predicted the corona’s existence several years ago. “We discovered that if we included a corona in the simulations of the Magellanic Clouds falling onto the Milky Way, we could explain the mass of extracted gas for the first time,” explained Elena D’Onghia, a co-investigator at the University of Wisconsin–Madison. “We knew that the Large Magellanic Cloud should be massive enough to have a corona.”

But although the corona stretches more than 100,000 light-years from the Magellanic clouds and covers a huge portion of the southern sky, it is effectively invisible. Mapping it out required scouring through 30 years of archived data for suitable measurements.

Researchers think that a galaxy’s corona is a remnant of the primordial cloud of gas that collapsed to form the galaxy billions of years ago. Although coronas have been seen around more distant dwarf galaxies, astronomers had never before been able to probe one in as much detail as this.

There’re lots of predictions from computer simulations about what they should look like, how they should interact over billions of years, but observationally we can’t really test most of them because dwarf galaxies are typically just too hard to detect,” said Krishnarao. Because they are right on our doorstep, the Magellanic Clouds provide an ideal opportunity to study how dwarf galaxies interact and evolve.

In search of direct evidence of the Magellanic Corona, the team combed through the Hubble and FUSE archives for ultraviolet observations of quasars located billions of light-years behind it. Quasars are the extremely bright cores of galaxies harboring massive active black holes. The team reasoned that although the corona would be too dim to see on its own, it should be visible as a sort of fog obscuring and absorbing distinct patterns of bright light from quasars in the background. Hubble observations of quasars were used in the past to map the corona surrounding the Andromeda galaxy.

By analyzing patterns in ultraviolet light from 28 quasars, the team was able to detect and characterize the material surrounding the Large Magellanic Cloud and confirm that the corona exists. As predicted, the quasar spectra are imprinted with the distinct signatures of carbon, oxygen, and silicon that make up the halo of hot plasma that surrounds the galaxy.

The ability to detect the corona required extremely detailed ultraviolet spectra. “The resolution of Hubble and FUSE were crucial for this study,” explained Krishnarao. “The corona gas is so diffuse, it’s barely even there.” In addition, it is mixed with other gases, including the streams pulled from the Magellanic Clouds and material originating in the Milky Way.

By mapping the results, the team also discovered that the amount of gas decreases with distance from the center of the Large Magellanic Cloud. “It’s a perfect telltale signature that this corona is really there,” said Krishnarao. “It really is cocooning the galaxy and protecting it.”

How can such a thin shroud of gas protect a galaxy from destruction?

“Anything that tries to pass into the galaxy has to pass through this material first, so it can absorb some of that impact,” explained Krishnarao. “In addition, the corona is the first material that can be extracted. While giving up a little bit of the corona, you’re protecting the gas that’s inside of the galaxy itself and able to form new stars.”

Did the pandemic change our personalities? Increased neuroticism among young adults seen: Study

Posted on by
Reply

Despite a long-standing hypothesis that personality traits are relatively impervious to environmental pressures, the COVID-19 pandemic may have altered the trajectory of personality across the United States, especially in younger adults, according to a new study published this week in the open-access journal PLOS ONE by Angelina Sutin of Florida State University College of Medicine, and colleagues.

Previous studies have generally found no associations between collective stressful events—such as earthquakes and hurricanes—and personality change. However, the coronavirus pandemic has affected the entire globe and nearly every aspect of life.

In the new study, the researchers used longitudinal assessments of personality from 7,109 people enrolled in the online Understanding America Study. They compared five-factor model personality traits—neuroticism, extraversion, openness, agreeableness and conscientiousness—between pre-pandemic measurements (May 2014 – February 2020) and assessments early (March – December 2020) or later (2021-2022) in the pandemic. A total of 18,623 assessments, or a mean of 2.62 per participant, were analyzed. Participants were 41.2% male and ranged in age from 18 to 109.

A crowd of people at a pedestrian crossing./CREDIT:Brian Merrill, Pixabay, CC0(https://creativecommons.org/publicdomain/zero/1.0/)

Consistent with other studies, there were relatively few changes between pre-pandemic and 2020 personality traits, with only a small decline in neuroticism. However, there were declines in extraversion, openness, agreeableness, and conscientiousness when 2021-2022 data was compared to pre-pandemic personality. The changes were about one-tenth of a standard deviation, which is equivalent to about one decade of normative personality change. The changes were moderated by age, with younger adults showing disrupted maturity in the form of increased neuroticism and decreased agreeableness and conscientiousness, and the oldest group of adults showing no statistically significant changes in traits.

The authors conclude that if these changes are enduring, it suggests that population-wide stressful events can slightly bend the trajectory of personality, especially in younger adults.

The authors add: “There was limited personality change early in the pandemic but striking changes starting in 2021. Of most note, the personality of young adults changed the most, with marked increases in neuroticism and declines in agreeableness and conscientiousness. That is, younger adults became moodier and more prone to stress, less cooperative and trusting, and less restrained and responsible.”

Celebrate ‘International Observe the Moon Night’ with NASA [Details]

Posted on by
Reply

The public is invited to participate in NASA’s celebration of “International Observe the Moon Night” on Saturday, Oct. 1. This annual, worldwide public engagement event takes place when the Moon is close to first quarter – a great phase for evening observing.  Last year about 500,000 people participated from 122 countries and all seven continents.

This celebration provides opportunities to learn about lunar science and exploration, observe celestial bodies, and honor personal and cultural connections to the Moon.

How to participate:

  • Host an event in your community; participate in an event; or observe with your family, friends, or on your own. Events can be in-person, virtual, or hybrid.
  • Register your participation to add yourself to the map of lunar observers worldwide.
  • Connect  with lunar enthusiasts around the world and share your Moon viewing experience on social media, tagging #ObserveTheMoon.
  • On October 1, tune into a NASA TV Broadcast from 7p.m.–8p.m. EST and find views of the Moon from telescopes around the world on the program’s Live Streams page.
  • Find more information and resources on moon.nasa.gov/observe.

Refer to NASA’s Moon viewing guides, activity guides, and custom 2022 program Moon maps to make the most of your observations:

The Moon is a stepping stone to learning more about our solar system, galaxy, and universe. NASA is preparing to launch its Artemis I test flight to the Moon, a major step forward in a new era of human deep-space exploration.

Celebrate ‘International Observe the Moon Night’ with NASA/Credits: NASA/Vi Nguyen

Through Artemis missions, NASA will land the first woman and the first person of color on the Moon, using innovative technologies to explore more of the lunar surface than ever before for the benefit of all.

International Observe the Moon Night is sponsored by NASA’s Lunar Reconnaissance Orbiter (LRO) mission and the Solar System Exploration Division of NASA’s Goddard Space Flight Center in Greenbelt, Maryland, with support from many partners. Launched on June 18, 2009, LRO has collected a treasure trove of data with its seven powerful instruments, making an invaluable contribution to our knowledge about the Moon. LRO is managed by NASA Goddard for the Science Mission Directorate at NASA Headquarters in Washington, D.C.

For more information about International Observe the Moon Night, visit: https://moon.nasa.gov/observe

For more information about the Oct. 1 live streams, visit: https://moon.nasa.gov/observe-the-moon-night/participate/live-streams/

For more information about the Artemis program, visit: https://www.nasa.gov/specials/artemis/

For more information about the Moon, visit: https://moon.nasa.gov

For more information about LRO, visit: https://www.nasa.gov/lro

Voice control smart devices might hinder children’s social, emotional development: Study

Posted on by
Reply

Voice control smart devices, such as Alexa, Siri, and Google Home, might hinder children’s social and emotional development, argues an expert in the use of artificial intelligence and machine learning in healthcare, in a viewpoint published online in the Archives of Disease in Childhood.

These devices might have long term effects by impeding children’s critical thinking, capacity for empathy and compassion, and their learning skills, says Anmol Arora of the University of Cambridge.

While voice control devices may act as ‘friends’ and help to improve children’s reading and communication skills, their advanced AI and ‘human’ sounding voices have prompted concerns about the potential long term effects on children’s brains at a crucial stage of development.

There are three broad areas of concern, explains the author. These comprise inappropriate responses; impeding social development; and hindering learning.

He cites some well publicised examples of inappropriate responses, including a device suggesting that a 10-year old should try touching a live plug with a coin.

Children-wikipedia

“It is difficult to enforce robust parental controls on such devices without severely affecting their functionality,” he suggests, adding that privacy issues have also arisen in respect of the recording of private conversations.

These devices can’t teach children how to behave politely, because there’s no expectation of a “please” or “thank you”, and no need to consider the tone of voice, he points out.

“The lack of ability to engage in non-verbal communication makes use of the devices a poor method of learning social interaction,” he writes. “While in normal human interactions, a child would usually receive constructive feedback if they were to behave inappropriately, this is beyond the scope of a smart device.”

Preliminary research on the use of voice assistants as social companions for lonely adults is encouraging. But it’s not at all clear if this also applies to children, he notes.

“This is particularly important at a time when children might already have had social development impaired as a result of COVID-19 restrictions and when [they] might have been spending more time isolated with smart devices at home,” he emphasises.

Devices are designed to search for requested information and provide a concise, specific answer, but this may hinder traditional processes by which children learn and absorb information, the author suggests.

When children ask adults questions, the adult can request contextual information, explain the limitations of their knowledge and probe the child’s reasoning—a process that these devices can’t replicate, he says.

Searching for information is also an important learning experience, which teaches critical thinking and logical reasoning, he explains.

“The rise of voice devices has provided great benefit to the population. Their abilities to provide information rapidly, assist with daily activities, and act as a social companion to lonely adults are both important and useful, the author acknowledges.

“However, urgent research is required into the long-term consequences for children interacting with such devices,” he insists.

“Interacting with the devices at a crucial stage in social and emotional development might have long-term consequences on empathy, compassion, and critical thinking,” he concludes.

 

WhatsApp’s critical bug found, fixed, re-install now, advises Meta

Posted on by
Reply

WhatsApp owner Meta has revealed that a critical bug in older installations was fixed now and advised all users to update their devices with latest software version.

It said the vulnerability could allow an attacker to exploit a code error known as an integer overflow. “An integer overflow in WhatsApp for Android prior to v2.22.16.12, Business for Android prior to v2.22.16.12, iOS prior to v2.22.16.12, Business for iOS prior to v2.22.16.12 could result in remote code execution in an established video call,” WhatsApp said in an update.

Remote code executions (RCEs) usually occur due to malicious malware downloaded by the host and can happen regardless of the device’s geographic location and a hacker can remotely execute commands on someone else’s computing device.


The recently disclosed vulnerability called CVE-2022-36934, with a severity score of 9.8 out of 10 on the CVE scale and another bug that could have caused remote code execution when receiving a crafted video file – have been patched in the latest WhatsApp version, said the company.

WhatsApp is also rolling out Call Links to make it easier to start and join a call in just one tap and is testing secured and encrypted group video calls for up to 32 people on WhatsApp.

Sundar Pichai defends ‘aggressive’ cost saving, job cuts at Google

Posted on by
Reply

Alphabet and Google CEO Sundar Pichai has defended the company’s move to save costs of the company and advised employees not to see earning money alone as fun as little things in life can bring more joy than what money can do.

In a reply when asked why the company has shifted from “rapidly hiring and spending to equally aggressive cost saving,” he said: “”I’m a bit concerned that you think what we’ve done is what you would define as aggressive cost saving. I think it’s important we don’t get disconnected. You need to take a long-term view through conditions like this.”

Pichai plans to make the company 20 per cent more efficient, hinting at job cuts and going by reports, Google and its parent Alphabet are giving some workers 60 days time to apply for a new role at the company if their jobs are set to be cut.

in August, Google fired more than 50 workers at its incubator Area 120 and gave them extra 30 days to find another job at the company and a Google spokesman said that nearly 95 per cent of those employees found new roles within the notice period.

Pichai said the company is “still investing in long-term projects like quantum computing.” He added, “We’re committed to taking care of our employees. I think we’re just working through a tough moment macroeconomically and I think it’s important we as a company align and work together,” said Pichai.

Earlier, at the Code Conference, Pichai said that the more the company tries to understand the macroeconomic conditions, the more uncertain it is about it. “The macroeconomic performance is correlated to ad spend, consumer spend and so on,” he told the audience.

Google has suspended hiring new employees and reportedly told some existing employees to “shape up or ship out” if they fail to meet expectations.

How Titanic missed the iceberg warning by SS Mesaba before it sank?

Posted on by
Reply

Just before it sank, the RMS Titanic ship was sent an iceberg warning by other ships but the message never reached the bridge on the fateful night of 15th April 1912.  Ironic, one merchant steamship SS Mesaba which had sent the message also met with similar fate six years later.

In 1912 the merchant steamship SS Mesaba was crossing the Atlantic and sent a warning radio message to the RMS Titanic, the supposedly unsinkable ship that was destined to sink on its first voyage after it hit an iceberg, taking 1,500 lives and becoming the world’s most infamous shipwreck that prompted the blockbuster movie The Titanic.

According to Geoffrey Marcus, author of The Maiden Voyage, the message never reached the bridge, but instead was shoved under a paperweight.

The SS Mesaba continued as a merchant ship over the next six years before being torpedoed whilst in convoy in 1918. Using state-of-the art multibeam sonar, researchers at Bangor University have finally been able to positively identify the wreck and have revealed her position for the first time.

For the marine archaeologist, multibeam sonar has the potential to be as impactful as the use of aerial photography was for landscape archaeology. Multibeam sonar enables seabed mapping of such detail that superstructure details can be revealed on the sonar images.

Multibeam sonar image of the SS Mesaba lying on the sea bed in the Irish Sea./CREDIT:Bangor University

Currently, the SS Mesaba was one among 273 shipwrecks lying in 7,500 square miles of Irish Sea, which were scanned and cross-referenced against the UK Hydrographic Office’s database of wrecks and other sources.

It was thought that 101 wrecks were unidentified, but the number of newly identified wrecks was far higher, as many, the SS Mesaba included, had been wrongly identified in the past.

Details of all the wrecks have been published in a new book, Echoes from the Deep by Dr Innes McCartney of Bangor University, conducted under a Leverhulme Fellowship while at Bournemouth University.

Titanic/wikipedia

Innes said, “The results of the work described in the book has validated the multidisciplinary technique employed and it is a ‘game-changer’ for marine archaeology.

“Previously we would be able to dive to a few sites a year to visually identify wrecks. The Prince Madog’s unique sonar capabilities has enabled us to develop a relatively low-cost means of examining the wrecks. We can connect this back to the historical information without costly physical interaction with each site.”

Dr Michael Roberts who led the sonar surveys at the University’s School of Ocean Sciences explained:

Titanic/wikipedia

“The expertise and unique resources we have at Bangor University, such as the ‘Prince Madog’ enable us to deliver high quality scientific research in an extremely cost-effective manner.  Identifying shipwrecks such as those documented in the publication for historical research and environmental impact studies is just one example of this.”

Stressful life make people focus more on their romantic partner’s negative behavior

Posted on by
Reply

Stressful life circumstances can affect how married couples interact, but can they affect how partners see each other? A person experiencing stress is more likely to notice their spouse’s negative behavior than positive, according to a new study published in Social Psychological and Personality Science.

Prior research has focused on how stress influences behavior, but this study suggests that stress could affect what actions partners notice in the first place. The negative actions being monitored included a spouse breaking a promise, showing anger or impatience, or criticizing their partner.

“We found that individuals who reported experiencing more stressful life events outside of their relationship, such as problems at work, were especially likely to notice if their partner behaved in an inconsiderate manner,” says lead author Dr. Lisa Neff, of the University of Texas at Austin.

Researchers asked 79 heterosexual newlywed couples to complete a short survey each night for 10 days, in which they documented both their own and their partner’s behavior. Before beginning this portion of the study, participants completed a questionnaire in which they shared details on stressful events in their life.

Stress

Studying newlyweds drives home the significance of the results, Dr. Neff notes, because couples are especially likely to focus on each other’s positive behavior and overlook negative actions during the “honeymoon” period.

“For many people, the past few years have been difficult – and the stress of the pandemic continues to linger,” says Dr. Neff. “If stress focuses individuals’ attention toward their partner’s more inconsiderate behaviors, this is likely to take a toll on the relationship.”

Researchers noted a single stressful day was not enough to make someone zero in on their partner’s negative behavior, but a longer accumulation of stressful life circumstances could cause this shift in focus. The findings also suggest that those under stress were not any less likely to notice their partner’s positive behavior, but they were more likely to notice inconsiderate actions.

While it’s possible that being aware of the effects of stress could allow couples to correct their behavior and limit harm to the relationship, Dr. Neff notes that this will remain speculation until it is studied further. She also says that future research would do well to expand this study beyond the honeymoon phase.

“One direction would be to examine if the harmful effects of stress might be even stronger among couples no longer in the newlywed phase of their relationships,” says Dr. Neff, “but the fact that we found these effects in a sample of newlyweds speaks to how impactful the effects of stress can be.”

MIT engineers build a battery-free, wireless underwater camera; captures color photos even in unclear environment

Posted on by
Reply

Scientists estimate that more than 95 percent of Earth’s oceans have never been observed, which means we have seen less of our planet’s ocean than we have the far side of the moon or the surface of Mars.

The high cost of powering an underwater camera for a long time, by tethering it to a research vessel or sending a ship to recharge its batteries, is a steep challenge preventing widespread undersea exploration.

MIT researchers have taken a major step to overcome this problem by developing a battery-free, wireless underwater camera that is about 100,000 times more energy-efficient than other undersea cameras. The device takes color photos, even in dark underwater environments, and transmits image data wirelessly through the water.

The autonomous camera is powered by sound. It converts mechanical energy from sound waves traveling through water into electrical energy that powers its imaging and communications equipment. After capturing and encoding image data, the camera also uses sound waves to transmit data to a receiver that reconstructs the image.

Because it doesn’t need a power source, the camera could run for weeks on end before retrieval, enabling scientists to search remote parts of the ocean for new species. It could also be used to capture images of ocean pollution or monitor the health and growth of fish raised in aquaculture farms.

“One of the most exciting applications of this camera for me personally is in the context of climate monitoring. We are building climate models, but we are missing data from over 95 percent of the ocean. This technology could help us build more accurate climate models and better understand how climate change impacts the underwater world,” says Fadel Adib, associate professor in the Department of Electrical Engineering and Computer Science and director of the Signal Kinetics group in the MIT Media Lab, and senior author of the paper.

Joining Adib on the paper are co-lead authors and Signal Kinetics group research assistants Sayed Saad Afzal, Waleed Akbar, and Osvy Rodriguez, as well as research scientist Unsoo Ha, and former group researchers Mario Doumet and Reza Ghaffarivardavagh. The paper is published in Nature Communications.

The battery-free, wireless underwater camera could help scientists explore unknown regions of the ocean, track pollution, or monitor the effects of climate change./CREDIT-Image: Adam Glanzman

Going battery-free

To build a camera that could operate autonomously for long periods, the researchers needed a device that could harvest energy underwater on its own while consuming very little power.

The camera acquires energy using transducers made from piezoelectric materials that are placed around its exterior. Piezoelectric materials produce an electric signal when a mechanical force is applied to them. When a sound wave traveling through the water hits the transducers, they vibrate and convert that mechanical energy into electrical energy.

Those sound waves could come from any source, like a passing ship or marine life. The camera stores harvested energy until it has built up enough to power the electronics that take photos and communicate data.

To keep power consumption as a low as possible, the researchers used off-the-shelf, ultra-low-power imaging sensors. But these sensors only capture grayscale images. And since most underwater environments lack a light source, they needed to develop a low-power flash, too.

They solved both problems simultaneously using red, green, and blue LEDs. When the camera captures an image, it shines a red LED and then uses image sensors to take the photo. It repeats the same process with green and blue LEDs.

Even though the image looks black and white, the red, green, and blue colored light is reflected in the white part of each photo, Akbar explains. When the image data are combined in post-processing, the color image can be reconstructed.

Nature/water/Ians

Sending data with sound

Once image data are captured, they are encoded as bits (1s and 0s) and sent to a receiver one bit at a time using a process called underwater backscatter. The receiver transmits sound waves through the water to the camera, which acts as a mirror to reflect those waves. The camera either reflects a wave back to the receiver or changes its mirror to an absorber so that it does not reflect back.

A hydrophone next to the transmitter senses if a signal is reflected back from the camera. If it receives a signal, that is a bit-1, and if there is no signal, that is a bit-0. The system uses this binary information to reconstruct and post-process the image.

“This whole process, since it just requires a single switch to convert the device from a nonreflective state to a reflective state, consumes five orders of magnitude less power than typical underwater communications systems,” Afzal says.

The researchers tested the camera in several underwater environments. In one, they captured color images of plastic bottles floating in a New Hampshire pond. They were also able to take such high-quality photos of an African starfish that tiny tubercles along its arms were clearly visible. The device was also effective at repeatedly imaging the underwater plant Aponogeton ulvaceus in a dark environment over the course of a week to monitor its growth.

Now that they have demonstrated a working prototype, the researchers plan to enhance the device so it is practical for deployment in real-world settings. They want to increase the camera’s memory so it could capture photos in real-time, stream images, or even shoot underwater video.

They also want to extend the camera’s range. They successfully transmitted data 40 meters from the receiver, but pushing that range wider would enable the camera to be used in more underwater settings.

This research is supported, in part, by the Office of Naval Research, the Sloan Research Fellowship, the National Science Foundation, the MIT Media Lab, and the Doherty Chair in Ocean Utilization.

 

Space News: Planetary-scale ‘heat wave’ discovered in Jupiter’s atmosphere

Posted on by
Reply

An unexpected ‘heat wave’ of 700 degrees Celsius, extending 130,000 kilometres (10 Earth diameters) in Jupiter’s atmosphere, has been discovered. James O’Donoghue, of the Japanese Aerospace Exploration Agency (JAXA), has presented the results this week at the Europlanet Science Congress (EPSC) 2022 in Granada.

Jupiter’s atmosphere, famous for its characteristic multicoloured vortices, is also unexpectedly hot: in fact, it is hundreds of degrees hotter than models predict. Due to its orbital distance millions of kilometres from the Sun, the giant planet receives under 4% of the amount of sunlight compared to Earth, and its upper atmosphere should theoretically be a frigid -70 degrees Celsius. Instead, its cloud tops are measured everywhere at over 400 degrees Celsius.

“Last year we produced – and presented at EPSC2021 – the first maps of Jupiter’s upper atmosphere capable of identifying the dominant heat sources,” said Dr O’Donoghue. “Thanks to these maps, we demonstrated that Jupiter’s auroras were a possible mechanism that could explain these temperatures.”

Just like the Earth, Jupiter experiences auroras around its poles as an effect of the solar wind. However, while Earth’s auroras are transient and only occur when solar activity is intense, auroras at Jupiter are permanent and have a variable intensity. The powerful auroras can heat the region around the poles to over 700 degrees Celsius, and global winds can redistribute the heat globally around Jupiter.

A panning-view of Jupiter’s upper atmospheric temperatures, 1000 kilometers above the cloud tops. Jupiter is shown on top of a visible image for context. In this snapshot, the auroral region (near the northern pole, in yellow/white) appears to have shed a massive, planetary-scale wave of heating towards the equator. The feature is over 130,000 kilometers long, or 10-Earth diameters, and is hundreds of degrees warmer than the background. For video see: https://youtu.be/gWT0QwSoVls/CREDIT:Hubble / NASA / ESA / A. Simon (NASA GSFC) / J. Schmidt. Credit: James O’Donoghue

Looking more deeply through their data, Dr O’Donoghue and his team discovered the spectacular ‘heat wave’ just below the northern aurora, and found that it was travelling towards the equator at a speed of thousands of kilometres per hour.

The heat wave was probably triggered by a pulse of enhanced solar wind plasma impacting Jupiter’s magnetic field, which boosted auroral heating and forced hot gases to expand and spill out towards the equator.

“While the auroras continuously deliver heat to the rest of the planet, these heat wave ‘events’ represent an additional, significant energy source,” added Dr O’Donoghue. “These findings add to our knowledge of Jupiter’s upper-atmospheric weather and climate, and are a great help in trying to solve the ‘energy crisis’ problem that plagues research into the giant planets.”

Washable, wearable sensors made from ‘PECOTEX’ styled into t-shirts and face masks to monitor body activities

Posted on by
Reply

Wearable sensors styled into t-shirts and face masks

Imperial researchers have embedded new low-cost sensors that monitor breathing, heart rate, and ammonia into t-shirts and face masks.

Potential applications range from monitoring exercise, sleep, and stress to diagnosing and monitoring disease through breath and vital signs.

Spun from a new Imperial-developed cotton-based conductive thread called PECOTEX, the sensors cost little to manufacture. Just $0.15 produces a metre of thread to seamlessly integrate more than ten sensors into clothing, and PECOTEX is compatible with industry-standard computerised embroidery machines.

First author of the research Fahad Alshabouna, PhD candidate at Imperial’s Department of Bioengineering, said: “The flexible medium of clothing means our sensors have a wide range of applications. They’re also relatively easy to produce which means we could scale up manufacturing and usher in a new generation of wearables in clothing.”

The research team embroidered the sensors into a face mask to monitor breathing, a t-shirt to monitor heart activity, and textiles to monitor gases like ammonia, a component of the breath that can be used to track liver and kidney function. The ammonia sensors were developed to test whether gas sensors could also be manufactured using embroidery.

Fahad added: “We demonstrated applications in monitoring cardiac activity and breathing, and sensing gases. Future potential applications include diagnosing and monitoring disease and treatment, monitoring the body during exercise, sleep, and stress, and use in batteries, heaters, anti-static clothing.”

The research is published today in Materials Today. 

Mask

Seamless sensors 

Wearable sensors, like those on smartwatches, let us continuously monitor our health and wellbeing non-invasively. Until now, however, there has been a lack of suitable conductive threads, which explains why wearable sensors seamlessly integrated into in clothing aren’t yet widely available.

Enter PECOTEX. Developed and spun into sensors by Imperial researchers, the material is machine washable, and is less breakable and more electrically conductive than commercially available silver-based conductive threads, meaning more layers can be added for to create complex types of sensor.[1]

Lead author Dr Firat Guder, also of the Department of Bioengineering, said: “PECOTEX is high-performing, strong, and adaptable to different needs. It’s readily scalable, meaning we can produce large volumes inexpensively using both domestic and industrial computerised embroidery machines.

“Our research opens up exciting possibilities for wearable sensors in everyday clothing. By monitoring breathing, heart rate, and gases, they can already be seamlessly integrated, and might even be able to help diagnose and monitor treatments of disease in the future.”

Next, the researchers will explore new application areas like energy storage, energy harvesting and biochemical sensing, as well as finding partners for commercialisation.

This study was funded by the Saudi Ministry of Education, Engineering and Physical Sciences Research Council (EPSRC, part of the UKRI), Cytiva, Imperial’s Department of Bioengineering, Bill and Melinda Gates Foundation, and the US Army.

Imperial College London press release.

Evidence that babies react to taste, smell in the womb; Carrot for “laughter-face” response, kale for “cry-face” response: Study

Posted on by
Reply

A study led by Durham University’s Fetal and Neonatal Research Lab, UK, took 4D ultrasound scans of 100 pregnant women to see how their unborn babies responded after being exposed to flavours from foods eaten by their mothers.

Researchers looked at how the fetuses reacted to either carrot or kale flavours just a short time after the flavours had been ingested by the mothers.

Fetuses exposed to carrot showed more “laughter-face” responses while those exposed to kale showed more “cry-face” responses.

Their findings could further our understanding of the development of human taste and smell receptors.

The researchers also believe that what pregnant women eat might influence babies’ taste preferences after birth and potentially have implications for establishing healthy eating habits.

The study is published in the journal Psychological Science.

pregnant lady/Commons.wikimedia.org

Humans experience flavour through a combination of taste and smell. In fetuses it is thought that this might happen through inhaling and swallowing the amniotic fluid in the womb.

Lead researcher Beyza Ustun, a postgraduate researcher in the Fetal and Neonatal Research Lab, Department of Psychology, Durham University, said: “A number of studies have suggested that babies can taste and smell in the womb, but they are based on post-birth outcomes while our study is the first to see these reactions prior to birth.

“As a result, we think that this repeated exposure to flavours before birth could help to establish food preferences post-birth, which could be important when thinking about messaging around healthy eating and the potential for avoiding ‘food-fussiness’ when weaning.

“It was really amazing to see unborn babies’ reaction to kale or carrot flavours during the scans and share those moments with their parents.”

The research team, which also included scientists from Aston University, Birmingham, UK, and the National Centre for Scientific Research-University of Burgundy, France, scanned the mothers, aged 18 to 40, at both 32 weeks and 36 weeks of pregnancy to see fetal facial reactions to the kale and carrot flavours.

Mothers were given a single capsule containing approximately 400mg of carrot or 400mg kale powder around 20 minutes before each scan. They were asked not to consume any food or flavoured drinks one hour before their scans.

A 4D scan image of a fetus showing a neutral face/CREDIT: FETAP (Fetal Taste Preferences) Study, Fetal and Neonatal Research Lab, Durham University.

The mothers also did not eat or drink anything containing carrot or kale on the day of their scans to control for factors that could affect fetal reactions.

Facial reactions seen in both flavour groups, compared with fetuses in a control group who were not exposed to either flavour, showed that exposure to just a small amount of carrot or kale flavour was enough to stimulate a reaction.

Co-author Professor Nadja Reissland, head of the Fetal and Neonatal Research Lab, Department of Psychology, Durham University, supervised Beyza Ustun’s research. She said: “Previous research conducted in my lab has suggested that 4D ultrasound scans are a way of monitoring fetal reactions to understand how they respond to maternal health behaviours such as smoking, and their mental health including stress, depression, and anxiety.

“This latest study could have important implications for understanding the earliest evidence for fetal abilities to sense and discriminate different flavours and smells from the foods ingested by their mothers.”

Co-author Professor Benoist Schaal, of the National Centre for Scientific Research-University of Burgundy, France, said: “Looking at fetuses’ facial reactions we can assume that a range of chemical stimuli pass through maternal diet into the fetal environment.

“This could have important implications for our understanding of the development of our taste and smell receptors, and related perception and memory.”

The researchers say their findings might also help with information given to mothers about the importance of taste and healthy diets during pregnancy.

They have now begun a follow-up study with the same babies post-birth to see if the influence of flavours they experienced in the womb affects their acceptance of different foods.

Research co-author Professor Jackie Blissett, of Aston University, said: “It could be argued that repeated prenatal flavour exposures may lead to preferences for those flavours experienced postnatally. In other words, exposing the fetus to less ‘liked’ flavours, such as kale, might mean they get used to those flavours in utero.

“The next step is to examine whether fetuses show less ‘negative’ responses to these flavours over time, resulting in greater acceptance of those flavours when babies first taste them outside of the womb.”

Related: http://dx.doi.org/10.1177/09567976221105460

 

Colorful Diapers smell bad? Soon new diapers lock not just liquid but odour too: Study

Posted on by
Reply

Activated carbon is used in kitchen fans to eliminate food odours. A new dissertation from the University of Gothenburg shows that activated carbon could also eliminate the smell of urine from diapers. Experiments with the odour molecule p-cresol show that activated carbon, which largely consists of the carbon variant graphene, can lock in odour instead of it being released to the surroundings.

Modern diapers can absorb and lock in a lot of liquid, meaning they do not have to be changed as often as in the past. But odour is still a problem. In a dissertation by Isabelle Simonsson at the University of Gothenburg, she looked at a specific odour molecule and discovered that in the right setting, it can choose to remain in the liquid and not cause foul odour.

“The odour molecule is called p-cresol and is an organic, volatile hydrocarbon. It’s what causes the strong odour associated with pig farming and horse stables. p-Cresol is also found in human urine and is hydrophobic, which means it avoids water. That’s one of the reasons why it is released from urine into the surrounding air, in other words, that the odour spreads,” says Isabelle Simonsson.

Electrically charged surfaces can adsorb odour

Manufacturers of diapers and other hygiene products have long known that an electrically charged surface can adsorb odour. There is even an old patent covering this, but a great deal has involved conducting tests on different materials and seeing what works. The tests have not resulted in a solution.

The main goal of the dissertation is to investigate what material properties are important for adsorbing odour molecules in urine. One of the materials used was activated carbon, which is found in almost every kitchen fan these days to neutralise odour; it is also an inexpensive and environmentally friendly material.

Tests with carbon materials that had been manipulated in various ways showed that carbon with the least charge was most effective at attracting p-cresol molecules from the liquid, resulting in less odour. Activated carbon, consisting mainly of the carbon variant graphene, was best at capturing the odour molecule.

“Our findings show a direct ‘ion-specific effect’ on the material’s properties and adsorption capability in synthetic urine. Activated carbon has a large surface area, which is good at adsorbing odour molecules,” says Simonsson.

Baby Diapers/wikipedia

Salts in urine enhance the effect

The same effect was not achieved in tests in which p-cresol was dissolved in water, which is due to the salts in urine. The salt ions, including sodium, reduce the water solubility of organic molecules, which then bind to the activated carbon instead.

The dissertation primarily involved fundamental research, but its findings may be useful in many industrial processes, including for the mining industry, water and sewage treatment, the development of new hygiene products, pharmaceuticals and construction materials.

“These results are promising, but there are obstacles to developing an odourless diaper. Like colour. Can you sell a diaper that’s black?”

Scent, sweat from human skin attract disease-spreading mosquitoes

Posted on by
Reply

Mosquitoes that spread Zika, dengue and yellow fever are guided toward their victims by a scent from human skin. The exact composition of that scent has not been identified until now.

A UC Riverside-led team discovered that the combination of carbon dioxide plus two chemicals, 2-ketoglutaric and lactic acids, elicits a scent that causes a mosquito to locate and land on its victim. This chemical cocktail also encourages probing, the use of piercing mouthparts to find blood.

This chemical mixture appears to specifically attract female Aedes aegypti mosquitoes, vectors of Zika as well as chikungunya, dengue, and yellow fever viruses. This mosquito originated in Africa, but has spread to tropical and subtropical regions worldwide, including the U.S.

Mosquitoes use a variety of cues to locate their victims, including carbon dioxide, sight, temperature, and humidity. However, Cardé’s recent research shows skin odors are even more important for pinpointing a biting site.

Aedes aegyptii mosquito biting a person./CREDIT CDC

“We demonstrated that mosquitoes land on visually indistinct targets imbued with these two odors, and these targets aren’t associated with heat or moisture,” Cardé said. “That leaves skin odor as the key guiding factor.”

Given the significance of odor in helping mosquitoes successfully feed on humans, Cardé wanted to discover the exact chemicals that make our scent so potent for the insects. Part of the equation, lactic acid, was identified as one chemical element in the odor cocktail as long ago as 1968.

Since then, several studies have identified that carbon dioxide combined with ammonia, and other chemicals produced by humans also attract these mosquitoes. However, Cardé, who has studied mosquitoes for 26 years, felt these other chemicals were not strong attractants.

Methods that chemists typically use to identify these chemicals would not have worked for 2-ketoglutaric acid, Cardé said. Gas chromatography, which separates chemicals by their molecular weight and polarity, would have missed this acid.

“I think that these chemicals may not have been found before because of the complexity of the human odor profile and the minute amounts of these compounds present in sweat,” said chemist Jan Bello, formerly of UCR and now with insect pest control company Provivi.

Searching for mosquito attractors, Cardé turned to Bello, who extracted compounds from the sweat in his own feet. He filled his socks with glass beads and walked around with the beads in his socks for four hours per odor collection.

Credit: MINDY TAKAMIYA/KYOTO UNIVERSITY ICEMS

“Wearing the beads felt almost like a massage, like squeezing stress balls full of sand, but with your feet,” said Bello. ‘The most frustrating part of doing it for a long time is that they would get stuck in between your toes, so it would be uncomfortable after a while.”

The inconvenience was worth the investment. Bello isolated chemicals from the sweat deposited on the sock beads and observed the mosquitoes’ response to those chemicals. In this way, the most active combination emerged.

Future studies are planned to determine whether the same compound is effective for any other mosquitoes, and why there is such variation in how individuals are apt to be bitten. “Some are more attractive than others to these mosquitoes, but no one’s yet established why this is so,” Cardé said.

Though this discovery may not lead to insights for the development of new repellants, the research team is hopeful their discovery can be used to attract, trap, and potentially kill disease-spreading mosquitoes.

On Track: Artemis I mission Cryogenic Demonstration Test Today at 4.45 Pm IST [Live schedule]

Posted on by
Reply

NASA Television will provide live coverage of the upcoming Artemis I cryogenic demonstration test on NASA TV beginning at 7:15 a.m. EDT or 4.30 pm IST on Wednesday, Sept. 21.

The demonstration test will allow teams to confirm the repair to a hydrogen leak seen during an early September Artemis I launch attempt, evaluate updated propellant loading procedures, and conduct additional evaluations. The demonstration will conclude when the objectives for the test have been met.

NASA remains on track for an Artemis I cryogenic demonstration test.In the days since the previous launch attempt, teams have analyzed the seals that were replaced on an interface for the liquid hydrogen fuel line between the Space Launch System (SLS) rocket and the mobile launcher and adjusted procedures for loading cryogenic, or supercold, propellants into the rocket. Engineers identified a small indentation found on the eight-inch-diameter liquid hydrogen seal that may have been a contributing factor to the leak on the previous launch attempt.

NASA’s Cryogenic Demonstration Test .Photo Credit: (NASA/Joel Kowsky)

During the test, teams will load propellants into both the core stage and upper stage tanks, and Orion and the SLS boosters will remain unpowered. Meteorologists currently predict favorable weather for the test with a 15% chance of lightning within 5 nautical miles of the area, which meets criteria required for the test, and will continue to monitor expected conditions.

Not just chemotherapy, now phototherapy is here for cancer treatment [Details]

Posted on by
Reply

One approach to treating cancer is photodynamic therapy using photo-uncaging systems, in which light is used to activate a cancer-fighting agent in situ at the tumor. However, suitable agents must be stable under visible light, have an anti-tumor effect in low-oxygen environments, and have the ability to be activated by low-energy tissue-penetrative red light – a combination of properties that is difficult to achieve. Now, a team from The Institute of Industrial Science at The University of Tokyo has developed a new platform that uses, for the first time, organorhodium(III) phthalocyanine complexes to achieve this combination of traits.

Conventional photodynamic techniques depend on the formation of reactive oxygen species to destroy tumor cells, but many tumors contain environments that lack oxygen. Photo-uncaging systems, where the agent is administered in an inactive form and then activated, or “uncaged”, in the location of the tumor, address this issue. They uncage alkyl radicals, which are known to be capable of inducing cell death both with and without the presence of oxygen. Alkyl radicals are converted into terminal aldehydes in the presence of oxygen, and these terminal aldehydes can also induce cell death. The team used molecules called “organorhodium(III) phthalocyanine (Pc) complexes” to develop, for the first time, a novel platform for photo-uncaging therapy.

Researchers from The Institute of Industrial Science, The University of Tokyo have developed a streamlined photo-uncaging system for photodynamic cancer therapy, using a pulse of light for tumor-specific activation of a cancer-fighting agent/CREDIT
Institute of Industrial Science, The University of Tokyo

“The organorhodium(III) phthalocyanine (Pc) complexes we developed are highly stable under ambient light during the processes of synthesis, purification, and measurement, but can be activated by a laser that gives out nanosecond pulses of red light,” explains lead author Kei Murata. These nanosecond-pulsing lasers (pulsing for a billionth of a second) are relatively easy for medical staff to handle.

They went on to show that the compounds that were released after the organorhodium(III) phthalocyanine (Pc) complexes were activated showed toxicity to HeLa cells, a cell line developed from cancer, indicating that these compounds would have the ability to fight cancer if released inside a tumor.

“Our new technology could allow the photochemical generation of a wide variety of alkyl radicals and aldehydes, making possible the site-selective release of various bioactive molecules,” says senior author Kazuyuki Ishii. As an improvement on other photo-uncaging systems, it opens an exciting new avenue for the treatment of cancer by phototherapy.

Mars lander InSight’s power diminishing fast, end of mission in sight?

Posted on by
Reply

InSight, which has hit headlines this week with the realtime recording of sound from the Mars when meteoroids struck Mars’ surface at four places since its landing on the Red Planet in November 2018, is nearing the end of its mission by mid-2023.

The first NASA mission to explore Mars’ deep interior, InSight rover landed on Mars surface on Nov. 26, 2018, in the Elysium Planitia region and collected enormous data over the past four years.

To its credit, the lander has detected more than 1,300 marsquakes since touching down on Mars, providing information that has allowed scientists to measure the depth and composition of Mars’ crust, mantle, and core.

As power on the spacecraft diminishes, the InSight team hopes to maximize the science and increase the possibility of recording additional marsquakes.

However, the lander achieved a milestone when NASA released the sound of a meteoroid striking Mars that was captured by its Reconnaissance Orbiter’s High Resolution Imaging Science Experiment (HiRISE) camera. The sound resembled like a “bloop” due to a peculiar atmospheric effect and the sound can be heard three times.

In addition, the InSight lander has provided visuals of three craters created between 2020 and 2021, ranging between 53 and 180 miles (85 and 290 kilometers) at Elysium Planitia.

It has proved a point that Mars has escaped from many such meteoroids as its atmosphere is just 1 per cent as thick as Earth’s, and several meteoroids pass through it without disintegrating, according to NASA. InSight’s team also said other impacts may have been obscured by noise from wind or by seasonal changes in the atmosphere.

The data helps NASA scientists to know the impact rate and estimate the age of different surfaces by counting its impact craters. The more they find, the older is the surface.

Auto shutdown of seismometer deferred

Initially, the lander was to automatically shut down the seismometer, its last operational science instrument by the end of June in order to conserve energy, surviving on what power its dust-laden solar panels can generate until around December.

Now, the team plans to program the lander to keep the seismometer operate three more months though batteries get discharged sooner and cause the spacecraft to run out of power soon. The team hopes that it might enable the seismometer to detect additional marsquakes.

“InSight hasn’t finished teaching us about Mars yet,” said Lori Glaze, director of NASA’s Planetary Science Division in Washington. “We’re going to get every last bit of science we can before the lander concludes operations.”

This collage shows three other meteoroid impacts that were detected by the seismometer on NASA’s InSight lander and captured by the agency’s Mars Reconnaissance Orbiter using its HiRISE camera. / NASA/JPL

As of September 10, 2022, InSight was generating an average of 420 watt-hours of energy per Martian day, or sol. The tau, or level of dust cover in the atmosphere, was estimated at .80 (typical tau levels outside of dust season range from 0.6-0.7).

All instruments but the seismometer have already been powered down. Like other Mars spacecraft, InSight has a fault protection system that automatically triggers “safe mode” in threatening situations and shuts down all but its most essential functions, allowing engineers to assess the situation. Low power and temperatures beyond pre-determined limits can trigger safe mode.

Seisomometer helps detect more Marsquakes

To enable the seismometer to continue to run for as long as possible, the mission team is turning off InSight’s fault protection system. While this will enable the instrument to operate longer, it leaves the lander unprotected from sudden, unexpected events that ground controllers wouldn’t have time to respond to.

“The goal is to get scientific data all the way to the point where InSight can’t operate at all, rather than conserve energy and operate the lander with no science benefit,” said Chuck Scott, InSight’s project manager at NASA’s Jet Propulsion Laboratory in Southern California.

Mars lander records sound of meteoroids hitting Red Planet (Listen Now)

Posted on by
Reply

The Mars lander’s seismometer has picked up vibrations from four separate impacts in the past two years, which is the first of its kind to have recorded seismic and acoustic waves from an impact on the Red Planet.

NASA’s InSight lander has detected seismic waves from four space rocks that crashed on Mars in 2020 and 2021, detected by the spacecraft’s seismometer since its landing in 2018.

A new paper published Monday in Nature Geoscience details the impacts, which ranged between 53 and 180 miles (85 and 290 kilometers) from InSight’s location, a region of Mars called Elysium Planitia.

The first of the four confirmed meteoroids – the term used for space rocks before they hit the ground – made the most dramatic entrance: It entered Mars’ atmosphere on Sept. 5, 2021, exploding into at least three shards that each left a crater behind.

Credit: NASA/JPL-Caltech

Then, NASA’s Mars Reconnaissance Orbiter flew over the estimated impact site and confirmed the  location using its black-and-white Context Camera to find three darkened spots on the surface. After locating these spots, the orbiter used the High-Resolution Imaging Science Experiment camera, or HiRISE, to get a color close-up of the craters.

“After three years of InSight waiting to detect an impact, those craters looked beautiful,” said Ingrid Daubar of Brown University, a co-author of the paper and a specialist in Mars impacts. Finally, scientists confirmed three other impacts had occurred on May 27, 2020; Feb. 18, 2021; and Aug. 31, 2021.

Researchers have puzzled over why they haven’t detected more meteoroid impacts on Mars. The Red Planet is next to the solar system’s main asteroid belt, which provides an ample supply of space rocks to scar the planet’s surface. Because Mars’ atmosphere is just 1% as thick as Earth’s, more meteoroids pass through it without disintegrating.

InSight’s seismometer has also detected over 1,300 marsquakes. Provided by France’s space agency, the Centre National d’Études Spatiales, the instrument is so sensitive that it can detect seismic waves from thousands of miles away. But the Sept. 5, 2021, event marks the first time an impact was confirmed as the cause of such waves.

InSight’s team suspects that other impacts may have been obscured by noise from wind or by seasonal changes in the atmosphere. But now that the distinctive seismic signature of an impact on Mars has been discovered, scientists expect to find more hiding within InSight’s nearly four years of data.

Listen to a Meteoroid Hitting the Red Planet

The sound of a meteoroid striking Mars – created from data recorded by NASA’s InSight lander – is like a “bloop” due to a peculiar atmospheric effect. In this audio clip, the sound can be heard three times: when the meteoroid enters the Martian atmosphere, explodes into pieces, and impacts the surface.

The four meteoroid impacts confirmed so far produced small quakes with a magnitude of no more than 2.0. Those smaller quakes provide scientists with only a glimpse into the Martian crust, while seismic signals from larger quakes, like the magnitude 5 event that occurred in May 2022, can also reveal details about the planet’s mantle and core.

But the impacts will be critical to refining Mars’ timeline. “Impacts are the clocks of the solar system,” said the paper’s lead author, Raphael Garcia of Institut Supérieur de l’Aéronautique et de l’Espace in Toulouse, France. “We need to know the impact rate today to estimate the age of different surfaces.”

Scientists can approximate the age of a planet’s surface by counting its impact craters: The more they see, the older the surface. By calibrating their statistical models based on how often they see impacts occurring now, scientists can then estimate how many more impacts happened earlier in the solar system’s history.

InSight’s data, in combination with orbital images, can be used to rebuild a meteoroid’s trajectory and the size of its shock wave. Every meteoroid creates a shock wave as it hits the atmosphere and an explosion as it hits the ground. These events send sound waves through the atmosphere. The bigger the explosion, the more this sound wave tilts the ground when it reaches InSight. The lander’s seismometer is sensitive enough to measure how much the ground tilts from such an event and in what direction.

“We’re learning more about the impact process itself,” Garcia said. “We can match different sizes of craters to specific seismic and acoustic waves now.”

The lander still has time to study Mars. Dust buildup on the lander’s solar panels is reducing its power and will eventually lead to the spacecraft shutting down. Predicting precisely when is difficult, but based on the latest power readings, engineers now believe the lander could shut down between October of this year and January 2023.