feed info

280,123 articles from PhysOrg

Counting calories in the fossil record

Starting about 250 million years ago, at the end of the Permian period, brachiopod groups disappeared in large numbers, along with 90 percent of the planet's species. Today, only a few groups, or genera, of brachiopods remain. "Most people won't be familiar with brachiopods. They're pretty rare in the modern ocean," said Jonathan Payne, a paleobiologist at Stanford University.

Generator uses the human body as an electrode to power portable electronics

(Phys.org) —It's well-known that the human body is a good conductor of electricity, and now researchers have taken advantage of this fact to create a small generator that uses the body as an electrode to power portable devices without the need for batteries. The "body contact electrode" replaces a grounded electrode that was used in a previous version of the generator, which would have been...

Geologists study Yilgarn's western crust

A group of geologists working for the Geological Survey of Western Australia has confirmed a long-standing belief that most of the Yilgarn Craton has a similar crustal architecture.

Improved design of lasers on optoelectronic chips will advance optical communications

When it comes to data transmission, light is superior to electronics. An ability to transmit data in parallel by utilizing multiple light wavelengths allows optical fibers to carry more information than electrical cables. Computers are currently based on electronics, but they would benefit from employing optical signals. However, for this to become a reality, it needs to be implemented on a small...

MIT researchers develop Mylar – a platform for building secure web applications

(Phys.org) —A team of researchers at MIT, led by Raluca Ada Popa has developed a platform for building secure web applications that is based on ensuring data on servers is always encrypted—they call it Mylar. In announcing the new platform, the developers noted that Mylar can protect user data from snooping even if a hacker obtains full access to a server.

New battery technology employs multifunctional materials

Lithium-ion batteries power a vast array of modern devices, from cell phones, laptops, and laser pointers to thermometers, hearing aids, and pacemakers. The electrodes in these batteries typically comprise three components: active materials, conductive additives, and binders.

New magnetic materials for extracting energy from tides

The objective of the MAGNETIDE project is to develop a new type of generator that transforms the mechanical energy produced by the movement of the tides into electric energy. Researchers have modified the generator's design so that components manufactured using PIM, Powder Injection Moulding, could be installed. This would reduce the cost of these systems as well as increasing their efficiency by...

New storms on Jupiter look like Mickey Mouse

We told you this was going to be a good season to observe Jupiter, and astrophotographers in the northern hemisphere have been making the most of this time of opposition where Jupiter has been riding high in the sky. What we didn't know was that there was going to be a familiar face staring back at us.

Silicon-based probe microstructure could underpin safer neural implants

Neural probe arrays are expected to significantly benefit the lives of amputees and people affected by spinal cord injuries or severe neuromotor diseases. By providing a direct route of communication between the brain and artificial limbs, these arrays record and stimulate neurons in the cerebral cortex.

Technique to make human embryonic stem cells more closely resemble true epiblast cells

Human embryonic stem cells (hESCs) have the ability to both convert into any cell type in the human body and to proliferate indefinitely in the laboratory. However, cultured hESCs, which are plucked from the developing embryo and then grown in vitro, often display a number of biological differences when compared to the pluripotent epiblast cells in the early embryo from which they originated.

Turkish court orders halt to Twitter ban

A Turkish court ordered the telecommunications authority to restore access to Twitter on Wednesday, issuing a temporary injunction five days after the government blocked the social network in Turkey.

Using electron beams to encode data in nanocrystals

Ferroelectric materials have an intrinsic electrical polarization caused by a small shift in the position of some of their atoms that occurs below a critical point called the Curie temperature. This polarization can be switched by an external electric field, an effect exploited in some computer memory devices.

Why the bizarre ocean dandelion is like an ant colony on steroids

I was 12 when I first came across an ocean dandelion. I wish I had known then how strange these animals truly are. I was watching a documentary where researchers had collected a deep-sea dandelion using a submersible, but upon returning to the surface, the dandelion had disintegrated into nothing but "petals".