science + technology news

Mechanical Memory Switch Outstrips Chip Technology

October 4, 2004

Boston University researchers have built mechanical memory switches that vibrate at 24 megahertz and use only femtowatts to change between states, allowing faster and more efficient storage than conventional electronic or magneto-electronic storage.

The switches, built with electron-beam lithography, are also resilient in electrical and magnetic fields.

Boston University news release

Drugs Delivered By Robots in the Blood

October 4, 2004

A microscopic swimming robot unveiled by Chinese scientists could eventually be used for drug delivery or to clear arteries in humans.

The 3 mm by 2 mm by 0.4 mm triangular machine is propelled using an external magnetic field that controls its microscopic fins: the speed of the craft can be changed by altering the resonant frequency of the magnetic field.

The next model of the robot will… read more

Control of Molecular Switches Increased By Tailored Intermolecular Interactions

October 4, 2004

Penn State researchers have developed a method to stabilize OPEs (oligo phenlylene-ethynylene) molecular switches by changing their local chemical environment.

OPEs had previously been shown to switch randomly or with applied electric fields between conductive and non-conductive states. Their potential use as switches in computers and other electronic devices would depend on the ability to control these states. Random switching was reduced with the new method, a step towards… read more

Motion Detector 1,000 Times More Sensitive

October 1, 2004

Sandia National Laboratories researchers have developed a motion detector that allows for viewing a motion of 10 nm with the naked eye.

The device depends upon a formerly unrecognized property of optics: light diffracted from very small gratings that move very small lateral distances undergoes a relatively big, and thus easily measurable, change in reflection.

Sandia National Laboratories news release

Robot Uses Whiskers To Get Around

October 1, 2004

University of Tokyo and University of Zurich researchers have developed a robot that uses real mouse whiskers as sensors.

Each whisker is plugged directly into a capacitor microphone at the front of the robot. This capacitor can detect vibrations with acute sensitivity — up to 3 thousand vibrations per second (3 kiloHertz). The process imitates the way a real mouse uses its whiskers to sense, via the nerves in… read more

Time on a Chip: The Incredible Shrinking Atomic Clock

October 1, 2004

Researchers are developing atomic clocks 1,000 times more accurate than the best quartz oscillators and a cubic centimeter in size.

They could fit into future cell phones or hand-held computers.

New Surface Chemistry May Extend Life of Technology for Making Transistors

September 30, 2004

University of Illinois at Urbana-Champaign researchers developed a technique that uses surface chemistry to make tinier and more effective p-n junctions in silicon-based semiconductors.

The technique may lead to faster silicon-based transistors, helping to shrink the active region in p-n junctions from the current 25 nm down towards 10 nm thick.

University of Illinois news release

Angela Belcher, Nanotechnologist, awarded MacArthur Fellowship

September 30, 2004

Angela Belcher, associate professor of materials science at MIT, has received a 2004 MacArthur Fellowship.

The Fellowship, with its non-restricted stipend of $500,000, is intended for “individuals who show exceptional merit and promise for continued and enhanced creative work.” Along with other research projects, Belcher has genetically modified viruses to interact with solutions of inorganic semiconductors, yielding self-assembling metal films and wires with diameters in the low tens of… read more

DNA as Substrate Speeds Up Chemical Reaction Discovery Time

September 30, 2004

Harvard University scientists have developed a new way to test the reactions between multiple chemicals simultaneously by piggybacking collections of different small organic molecules onto short strands of DNA, which then gives the reactants the opportunity to react by zipping together.

This system for reaction discovery, driven by DNA-templated synthesis, is so efficient that a single researcher can evaluate thousands of potential chemical reactions in a two-day experiment.… read more

Scientists Bringing ‘Table Top’ Particle Accelerators a Step Closer

September 30, 2004

Three research teams announced new developments in producing relativistic electron beams using laser-produced plasmas to accelerate the beams.

The beams have a narrow energy spread and are focusable. These new developments could help to shrink the size and cost of future particle accelerators for fundamental physics experiments and applications in materials and biomedicine. Laser electron accelerators could eventually fit into a university basement.

All three research teams published… read more

Mobile with 360 Mbit/s

September 30, 2004

Siemens researchers have developed a new mobile data communication system that can transfer data at of up to 360 megabits per second — about 100 times faster than the most powerful DSL connection.

The system uses Orthogonal Frequency Division Multiplexing (OFDM) technology to eliminate multipathing interference and multi-hop stations, a combination of base station, amplifier and router.

British Researchers Apply for Licence to Generate Human Brain Cells

September 29, 2004

The scientists who cloned Dolly the sheep at Edinburgh’s Roslin Institute have formally applied for a license to clone human embryos to find a cure for amyotrophic lateral sclerosis (called MND or motor neurone disease in the UK).

The research team plans to take DNA from the skin or blood of a person with MND and implant it into a human egg from which the genetic material has been… read more

New Sequence Involved In DNA Replication Timing May Aid In Cancer Detection

September 29, 2004

Scientists have discovered a DNA sequence that is involved in controlling DNA replication timing.

Because alterations in DNA replication timing are associated with cancer, this discovery may lead to improved methods for cancer detection. In many cancer cells, the normal order of DNA replication is altered. Tests for DNA replication timing may eventually become a method for early detection of cancer.

Programmed Human Aging Supports Survival of Species

September 29, 2004

A University of Southern California researcher proposes that aging is programmed so that the majority of a population dies prematurely to provide nutrients for the sake of a few individuals who have acquired the genetic mutations that increase their chances of reproduction.

Valter Longo’s research, based on observations of programmed aging in baker’s yeast, could imply that humans die earlier than they have to due to programmed human aging.… read more

Nanotube Defects Detected Using Vibrations

September 29, 2004

Max Planck Institute researchers have measured the vibrational modes of carbon nanotubes with atomic resolution and demonstrated that the vibrations are substantially modified near defects.

Using a scanning tunneling microscopy technique, the vibrational modes of carbon nanotubes were mapped with sub-nanometer spatial resolution. This allows the study of the role of local defects in the flow of heat and electrical charge in carbon nanostructures.

Maxread more

close and return to Home