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Nanotechnology

Photosynthesis no longer limited to plants thanks to new advances in nanotechnology

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Photosynthesis is a very important natural process that allows plants and bacteria to convert carbon dioxide into oxygen with the help of sun light and water. Without this process, humans and other animals would find it very hard to breath because as we all know, oxygen is essential for both vertebrates and invertebrates. In a way, photosynthesis can be looked as a symbiotic process between plants and animals given that the O2 produced and exhaled by plants is then assimilated by animals, which in turn transform it back into CO2 to be used by plants again. This wonderful cycle is a prime example of just how ingenious nature can be with her designs and now it’s also a testament to mankind’s extraordinary ability of replicating such complex natural processes.

Specifically, in a very impressive feat of nanoengineering scientists from the Lawrence Berkeley National Laboratory and the University of California have managed to replicate the process of photosynthesis by merging together silicon and titanium oxide nanowires with anaerobic bacteria. Unlike the real things, this artificial photosynthetic system will not be focused on producing oxygen, of which there is thankfully still plenty to go around for everybody. Rather, scientists are using the system in order to synthesize various chemicals and biofuels. The potential applications for this technology are pretty vast, but the focus will initially be on helping to create drugs and reliable sources of renewable energy.

The artificial photosynthesis system is not very efficient just yet, with its solar-to-chemical conversion sitting at only 3%. However, the scientists are confident that with some improvements they can get that percentage up to 10% at some point in the future. When that happens, the innovative technology will be commercially viable, according to Peidong Yang, one of the chemists who is leading the study, which was published earlier this month in the journal Nano Letters.

artificial-photosynthesis-system

This break-through artificial photosynthesis system has four general components: (1) harvesting solar energy, (2) generating reducing equivalents, (3) reducing CO2 to biosynthetic intermediates, and (4) producing value-added chemicals. Photo courtesy of Lawrence Berkeley National Laboratory.

Although George has many hobbies, he likes nothing more than to play around with cameras and other photography equipment.

Nanotechnology

The US Navy plans to conduct a test of a high-power microwave weapon designed to disable drones in the year 2026

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It is possible that the US Navy will try its first powerful microwave weapon on a ship as early as 2026. The experimental weapons, which are part of Project METEOR, will send out beams of very strong electromagnetic energy that will damage drone electronics.

According to the Navy’s Fiscal Year 2025 budget documents, METEOR will “provide capability with low cost-per-shot, deep magazine, tactically significant range, short time engagement for multi-target approach, and dual deception and defeat capability.” The USA Naval Institute News reported on this.

The US military is interested in directed energy systems, a new type of weapon that can hurt targets without using solid bullets. Microwave weapons are one type of these systems. These are things like lasers, soundwaves, and even particle beams, along with microwaves.

A very high-frequency wave of electromagnetic energy is used by powerful microwave weapons to harm equipment. If the equipment was used to aim at a drone, the waves would quickly destroy it. Each shot is pretty cheap (at least in theory) compared to rockets, bullets, and other flying weapons of mass destruction.

Part of the push for microwave weapons and other directed energy systems is a reaction to the rise of cheap drones, which have completely changed the way modern wars are fought, as the conflict between Russia and Ukraine, the war in Gaza, and the crisis in the Red Sea all show. Small armies and guerilla groups can use new drone technologies that are cheap, easy to get, and can be changed to do a lot of damage and trouble for even the strongest troops in the world.

One of the most dangerous threats is drone swarms, which are groups of dozens or even hundreds or thousands of machines that work together to launch an attack. In the years to come, this kind of technology is likely to become more and more connected with artificial intelligence (AI), which will make things even more dangerous.

Using regular weapons to fight this kind of enemy is expensive, but directed energy weapons could cut down on that cost while still being very effective.

According to DefenseScoop, Dr. Frank Peterkin, the Principal Director for Directed Energy in the Office of the Under Secretary of Defense for Research and Engineering, said in a recent webinar, “Directed energy is basically electromagnetic radiation, whether it’s light or RF [radio frequency] energy, and therefore travels at the speed of light.”

“For those of you who haven’t read a physics book in a while, hypersonic threats are really, really fast—that’s around 5 to 15 Mach.” The speed of light is 100,000 times faster than any hypersonic machine we or anyone else is working on. He also said, “It’s really fast.”

A lot of other countries are also making their focused energy weapons stronger. The UK recently showed off its DragonFire system, which is basically a big laser gun that can shoot down targets in the air. The UK Ministry of Defence (MOD) showed off the weapons in a film and said they could hit a target the size of a penny from 1 km away.

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Nanotechnology

The identification of vulnerabilities in virtual reality systems

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A group of computer scientists affiliated with the University of Chicago has identified a plausible weakness within virtual reality systems. According to the researchers, this flaw has the potential to let a hacker add an “inception layer” between a user’s virtual reality home screen and their virtual reality user or server. The research team has published a scholarly article detailing their methodology and outcomes on the arXiv preprint repository.

Virtual reality (VR) systems enable users to engage in interactive experiences within a simulated environment, wherein a wide range of conceivable scenarios can be simulated. In this novel endeavor, the research team envisioned a hypothetical situation wherein hackers may implant an application onto a user’s virtual reality (VR) headset, thereby deceiving users into engaging in actions that could potentially expose confidential data to the hackers.

The underlying concept of the application is to introduce an additional dimension that separates the user from the virtual environment often encountered through their virtual reality (VR) gear. It is known as an “inception layer,” after the movie in which Leonardo DiCaprio plays a character who experiences the downloading of a modified layer of reality into his brain.

According to the researchers, this layer has the potential to enable hackers to capture data, such as a passcode inputted into a virtual ATM. Additionally, it has the capability to intercept and modify data, such as monetary sums allocated for a transaction, and redirect the disparity to the hacker’s financial account.

It has the potential to incorporate visual elements into the virtual reality environment, such as characters embodying acquaintances or relatives, and employ this deception to establish confidence or obtain privileges. Essentially, it has the capability to observe or modify gestures, vocal emissions, internet surfing behavior, and social or professional engagements.

According to the research team, it is possible for a user to download such an application onto their virtual reality (VR) device in the event that they successfully breach their WiFi network or obtain physical entry. Once implemented, it has the capability to operate autonomously without user intervention. The researchers recruited 28 participants to play a game using a demonstration virtual reality headset in order to examine the aforementioned hypothesis.

The researchers proceeded to download an application onto the devices, imitating a hacking incident. Subsequently, the volunteers were queried regarding any observations they may have made, as the download and activation procedures resulted in a slight flashing sound. Merely 10 volunteers observed, and just one of them raised doubts regarding the presence of any malicious activity.

The research team informed Meta, the manufacturer of the Meta Quest virtual reality (VR) system utilized in the experiment, of their findings. In response, Meta expressed their intention to investigate the potential vulnerability and rectify it if it is verified. Additionally, the researchers acknowledge that these vulnerabilities are likely to be present in other systems and applications that similarly aim to establish a connection between users and their virtual reality gadgets.

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Engineering

Exploring the Depths: The Quest for Dark Matter Beneath the Earth’s Surface

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Based on observations made by astronomers studying the observable universe, it has been determined that approximately 5 percent of the universe consists of matter. The remaining portion, or the vast majority of it, consists of dark matter (approximately 27 percent) and dark energy (approximately 68 percent).

Dark matter is a type of matter that cannot be detected through its own light emission. It only interacts with regular matter through the force of gravity. This interaction can be observed in galaxies and galaxy clusters, providing evidence for its existence. However, considering the abundance of this mysterious substance compared to regular matter, it is only natural for scientists to actively search for concrete proof of its presence.

One way to locate it, which may seem surprising since dark matter accounts for what we observe in the stars and galaxies, is to go underground.

Scientists around the world conduct research in various underground facilities to study phenomena like weakly interacting massive particles (WIMPs) and the impact of neutrinos. It is believed that the WIMPs are constantly passing through the Earth as it moves through space. To detect them, we require highly sensitive detectors capable of capturing these subtle interactions.

“In the Stanford LUX-ZEPLIN experiment, an electric field is applied across the volume of liquid, causing the released electrons to be pushed towards the liquid’s surface,” explained Hugh Lippincott, a physics professor at the University of California, Santa Barbara, in an article for The Conversation.

When they break through the surface, an additional electric field propels them into the xenon-filled space above the liquid, where they produce a second burst of light. Two extensive arrays of light sensors capture the two bursts of light, enabling researchers to reconstruct the precise location, energy, and nature of the interaction that occurred.

They are very good scanners, and even if they don’t find dark matter, they can help narrow down what it isn’t. It’s just that putting them on the surface would make them pick up way too much noise.

“On Earth, however, we are constantly surrounded by low, nondangerous levels of radioactivity coming from trace elements—mainly uranium and thorium—in the environment, as well as cosmic rays from space,” Lippincott said. “The goal in hunting for dark matter is to build as sensitive a detector as possible, so it can see the dark matter, and to put it in as quiet a place as possible, so the dark matter signal can be seen over the background radioactivity.”

They are put deep below the ground so they can find dark matter. SNOLAB is the world’s deepest and cleanest lab. Every day, scientists have to go 2 kilometers (1.24 miles) underground and then walk further inside a working mine to get there.

The LUX-ZEPLIN project, which is deep in the Black Hills of South Dakota, has been recording about five events a day. This is a lot less than the trillion events it would pick up at the surface. Scientists have ruled out dark matter as a possible cause for all of them, though. But as long as the tests keep going, there is still hope that they will find proof of all the lost stuff in the universe deep underground.

 

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