Tech

It may not be intuitive, but a coating of reflective metal can actually make something less visible, engineers at Stanford and UPenn have shown. They have created an invisible, light-detecting device that can "see without being seen."

At the heart of the device are silicon nanowires covered by a thin cap of gold. By adjusting the ratio of metal to silicon – a technique the engineers refer to as tuning the geometries – they capitalize on favorable nanoscale physics in which the reflected light from the two materials cancel each other to make the device invisible.

Modern day soldiers who mutilate enemy corpses or take body-parts as trophies are usually thought to be suffering from the extreme stresses of battle. But, research funded by the Economic and Social Research Council (ESRC) shows that this sort of misconduct has most often been carried out by fighters who viewed the enemy as racially different from themselves and used images of the hunt to describe their actions.

Los Angeles, CA (May 18, 2012) More than 5,000 people die each year in vehicle crashes caused by distracted driving, many who were texting and talking on cellphones behind the wheel, according to the May 4 issue of CQ Researcher (published by CQ Press, an imprint of SAGE). Teen drivers appear to be especially susceptible to distraction.

Vacuum tubes have been retro for decades. They almost completely disappeared from the electronics scene when consumers exchanged their old cathode ray tube monitors for flat screen TVs. Their replacement – the semiconductor – is generally the cheaper, lighter, more efficient, and easier to manufacture of the two technologies.

But vacuum tubes are more robust in high-radiation environments such as outer space. And since electrons travel faster in a vacuum than through a semiconductor, vacuum tubes are an intrinsically better medium for electricity.

Laser technology uses light. Light can be rapidly and precisely deflected, shaped and focused. If we pulse laser light and reduce pulse duration more and more, the laser tool works even more precisely. A benefit: The material being processed heats up less and less. High-power, ultra-short pulses, then, are the ideal solution for medical applications, in brain surgery for instance, as the cerebral membrane is not damaged. Or for removing tumor tissue thereby conserving the surrounding tissue and blood vessels.

When manufacturing products, the coating technology is a key innovation driver for almost all areas of daily life – for example, for making scratch-proof displays for smart phones or anti-bacterial surfaces in refrigerators. Other coatings protect components from corrosion or aging, for example in a solar cell module or a car engine, without the end user noticing their existence. In industry today, wet chemical processes or vacuum plasma processes are primarily used for coating applications. Both have drawbacks.

Metalworking plays a key role in industry. Drilling, milling, turning and grinding operations all use lubricants to prevent work pieces and tools from overheating and from excess wear. Standard lubricants today are based on mineral oil. This has drawbacks: fossil mineral oils come from finite resources, transport relatively little heat away from the work piece, are harmful to health and are flammable. All of this calls for extreme technical efforts, for occupational safety, fire safety and disposal, for example. So there's a need for alternative lubricants.

Laser systems can be used to implement highly precise and ultra-fast measuring processes. Railway measuring technology has a huge worldwide need here. One prerequisite for its use is that nobody is damaged or suffers irritations by the laser. Dr. Heinrich Höfler and Dipl.-Ing. Harald Wölfelschneider from the Fraunhofer Institute for Physical Measurement Techniques IPM in Freiburg have worked with their team to develop a 3D laser scanner. It can be used outdoors without hesitation.

The first purely silicon oxide-based 'Resistive RAM' memory chip that can operate in ambient conditions – opening up the possibility of new super-fast memory - has been developed by researchers at UCL.

Resistive RAM (or 'ReRAM') memory chips are based on materials, most often oxides of metals, whose electrical resistance changes when a voltage is applied – and they "remember" this change even when the power is turned off.

Flat computers, powerful cell phones and tablets – the integrated circuits, our computers' power centers, are becoming increasingly smaller and more complex. The microchips in today's computers already contain some two billion transistors. To get the chip density right, the structures are exposed onto the chips by means of lithography. To be able to meet future requirements, the semi-conductor industry is planning to convert the exposure using a wavelength of 193 nm to a wavelength of just 13.5 nm. This can be achieved only with completely new radiation sources.

ANN ARBOR, Mich.--- Across history and cultures, religion increases trust within groups but also may increase conflict with other groups, according to an article in a special issue of Science.

"Moralizing gods, emerging over the last few millennia, have enabled large-scale cooperation and sociopolitical conquest even without war," says University of Michigan anthropologist Scott Atran, lead author of the article with Jeremy Ginges of the New School for Social Research.

New research from Kennedy Krieger finds that a simple pull-to-sit task at six months of age may predict risk of an autism spectrum disorder. Researchers at Kennedy Krieger identified weak head and neck control as a red flag for autism and language and/or social developmental delays. This video is an example of the weak head and neck control; the infant is unable to maintain head alignment when being carefully, yet firmly, pulled by the arms from lying flat on his/her back to a sitting position.

HOUSTON -- (May 17, 2012) -- Researchers have unveiled an "inexact" computer chip that challenges the industry's dogmatic 50-year pursuit of accuracy. The design improves power and resource efficiency by allowing for occasional errors. Prototypes unveiled this week at the ACM International Conference on Computing Frontiers in Cagliari, Italy, are at least 15 times more efficient than today's technology.

ANN ARBOR, Mich.—Returning extra medicine to the pharmacy for disposal might not be worth the extra time, money or greenhouse gas emissions, according to a University of Michigan study that is the first to look at the net effects of so-called take-back programs.

The new evidence suggests that discarding unused drugs in the trash is a better option to limit the risk of poisoning and at the same time curb pollution of both water and air.

With epidemics of Type 2 diabetes looming in rural India, China and other areas of the world where poverty limits the availability of health care, scientists are reporting development of an inexpensive and easy-to-use urine test ideally suited for such areas. The report describing the paper-based device, which also could be adapted for the diagnosis and monitoring of other conditions and the environment, appears in ACS' journal Analytical Chemistry.