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Wednesday, February 1, 2012

ScienceDaily: Top Technology News

ScienceDaily: Top Technology News

'Your password is invalid': Improving website password practices

Posted: 31 Jan 2012 10:57 AM PST

Internet users are increasingly asked to register with a user name and password before being able to access the content of many sites. Researchers have now identified impediments to efficient password creation and provided design strategies for enhancing the user experience.

Risk-based passenger screening could make air travel safer

Posted: 31 Jan 2012 10:57 AM PST

Intensive screening of all airline passengers actually makes the system less secure by overtaxing security resources, while risk-based methods increase overall security, according to new research. The researchers developed three algorithms dealing with risk uncertainty in the passenger population. Then, they ran simulations to demonstrate how their algorithms could estimate risk in the overall passenger population and how errors in this estimation procedure can be mitigated to reduce the risk to the overall system.

Ultra-fast photodetector and terahertz generator

Posted: 31 Jan 2012 10:57 AM PST

Photodetectors made from graphene can process and conduct light signals as well as electric signals extremely fast. Within picoseconds the optical stimulation of graphene generates a photocurrent. Until now, none of the available methods were fast enough to measure these processes in graphene. Scientists have now developed a method to measure the temporal dynamics of this photo current. Furthermore they discovered that graphene can emit terahertz radiation.

IBEX spacecraft measures 'alien' particles from outside solar system

Posted: 31 Jan 2012 10:57 AM PST

Using data from NASA's Interstellar Boundary Explorer spacecraft, an international team of researchers has measured neutral "alien" particles entering our solar system from interstellar space. A suite of studies provides a first look at the constituents of the interstellar medium, the matter between star systems, and how they interact with our heliosphere.

Perfect nanotubes shine brightest: Researchers show how length, imperfections affect carbon nanotube fluorescence

Posted: 31 Jan 2012 09:24 AM PST

A painstaking study has brought a wealth of new information about single-walled carbon nanotubes through analysis of their fluorescence. The researchers found that the brightest nanotubes of the same length show consistent fluorescence intensity, and the longer the tube, the brighter.

Online news portals get credibility boost from trusted sources

Posted: 31 Jan 2012 09:18 AM PST

People who read news on the web tend to trust the gate even if there is no gatekeeper, according to researchers.

Microscopy reveals 'atomic antenna' behavior in graphene

Posted: 31 Jan 2012 09:12 AM PST

Atomic-level defects in graphene could be a path forward to smaller and faster electronic devices. With unique properties and potential applications in areas from electronics to biodevices, graphene, which consists of a single sheet of carbon atoms, has been hailed as a rising star in the materials world. Now, a new study suggests that point defects, composed of silicon atoms that replace individual carbon atoms in graphene, could aid attempts to transfer data on an atomic scale by coupling light with electrons.

'Cool' gas may form and strengthen sunspots

Posted: 31 Jan 2012 06:31 AM PST

Hydrogen molecules may act as a kind of energy sink that strengthens the magnetic grip that causes sunspots, according to scientists using a new infrared instrument on an old telescope.

Targeted DNA vaccine using an electric pulse

Posted: 30 Jan 2012 06:36 AM PST

The vaccines of the future against infections, influenza and cancer can be administered using an electrical pulse and a specially produced DNA code, new research suggests. The DNA code programs the body's own cells to produce a super-fast missile defense against the disease, researchers say.
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