Laboratory Devices

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Source: www.guardian.co.uk --- 22 days ago
A novel nuclear technology is making a comeback - but why are the researchers keeping quiet about it? There was uproar in the scientific community in 2003 when it emerged that the US military was funding research into miniature warheads based on nuclear isomers. The science behind the project was attacked and even ridiculed. Nuclear isomers are atoms with a "metastable" nucleus. Perhaps the best analogy is to consider the nucleons as snooker balls. In a normal atom, the balls are all flat on the table. In a metastable isomer, they are piled in a pyramid, ready to collapse and release energy, given the right sort of prod. Everyone agrees that nuclear isomers can store vast amounts of energy - less than is released in other nuclear reactions, but thousands of times more than chemical fuels. The question is whether the isomeric decay is random, or whether it can be triggered by interaction with an x-ray or other high-energy photon. Triggering could release an intense burst of gamma rays, lethal to both humans and electronic Devices. The planned weapon was dubbed "the death ray bomb" and "the atomic hand grenade" ( US military pioneers death ray bomb , August 2003). Trigger happy Triggering of the 178m2 isomer of Hafnium was reported by Carl Collins of the University of Texas in 1999. But others, notably the Argonne National Laboratory, were not able to repeat his results. Academic opposition was intense, and a panel of scientists ur ...

Source: www.afterdawn.com --- 14 days ago
Back in 2006, Dr. Marin Soljacic at the MIT Department of Physics and Research Laboratory of Electronics demonstrated the transmission of Electricity using using magnetic resonance. On Thursday, Intel was to demonstrate some progress in the wireless charging technology, which could be used to charge laptops, MP3 players and mobile phones without the need to connect any wires. Intel was to demonstrate that it has cut the previous 50% loss in power to between 40% and 25% loss. However, Dr. Izahr Matzkevich , cofounder of wireless developer WildCharge , warned that the technology still has a long way to go before it becomes more efficient and more practical in use. Soljacic's original demonstrations could transmit electricity to portable Devices up to 7 feet. Present technology requires that wireless rechargers must be in contact with recharging bases or recharging mats. "Resonance technology like the MIT demonstration requires a heavy infrastructure -- right now, with coils of at least two feet -- to accomplish even a small distance, " he said. "Add to that a 35 percent loss in power, this is not insignificant." There is also the problem of interference with other electrical equipment. Nevertheless, the technology is still worth developing. Permalink | Comments ...

Source: www.newscientist.com --- 12 days ago
US shipping ports receive about 6 million cargo containers each year. Officials would like to be able to check each one for smuggled nuclear material, but today's detectors cannot process such numbers in a reasonable time. These Devices typically require an officer to search inside each container. The gamma rays produced by radioactive materials can pass through containers relatively easily, but uranium produces only small amounts of such radiation. Joseph Farmer and colleagues at the Lawrence Livermore National Laboratory in California have produced a new detector sensitive even to low levels of gamma radiation. Their device is set to speed up screening times. It doesn't directly detect gamma rays themselves, but instead looks for the hydrogen peroxide generated when the rays interact with water. The detector consists of an "electronic nose" chip coated with a thin layer of water that is condensed onto its surface. When gamma rays strike water molecules in that layer the nose chip detects any hydrogen peroxide formed. The inventors say that as well as being more sensitive their design can pick up a wider range of gamma ray energies than conventional detectors. Read the full electronic nose radiation sniffer patent application. Justin Mullins, New Scientist consultant ...

Source: www.springerlink.com --- 28 days ago
Abstract   Graphitic carbon nitride (g-C 3 N 4 ) has been synthesized via a two-step pyrolysis of melamine (C 3 H 6 N 6 ) at 800°C for 2 h under vacuum conditions. X-ray diffraction (XRD) patterns strongly indicate that the synthesized sample is g-C 3 N 4 . Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) morphologies indicate that the product is mainly composed of graphitic carbon nitride. The stoichiometric ratio of C:N is determined to be 0.72 by elemental analysis (EA). Chemical bonding of the sample has been investigated by X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR). Electron energy loss spectroscopy (EELS) verifies the bonding state between carbon and nitrogen atoms. Optical properties of the g-C 3 N 4 were investigated by PL (photoluminescence) measurements and UV–Vis (ultraviolet–visible) absorption spectra. We suppose its luminescent properties may have potential application as component of optical nanoscale Devices. Thermogravimetric analysis (TGA) and differential thermal analysis (DTA) were also performed. Content Type Journal Article DOI 10.1007/s00339-008-4816-4 Authors Xuefei Li, Jilin University National Laboratory of Superhard Materials Changchun 130012 China Jian Zhang, Jilin University National Laboratory of Superhard Materials Changchun 130012 China Longhai Shen, Jilin University National Laboratory of Superhard Materials Changchun 130012 Ch ...

Source: www.springerlink.com --- 11 days ago
Abstract   Atomic Force Microscopy (AFM) mechanical lithography is a simple but significant method for nanofabrication. In this work, we used this method to construct nanostructures on Pt/Cu bilayer metal electrodes under ambient conditions in air. The influence of various scratch parameters, such as the applied force, scan velocity and circle times, on the lithography patterns was investigated. The Pt-Cu-Cu x O-Cu-Pt nanostructure was constructed by choosing suitable scratch parameters and oxidation at room temperature. The properties of the scratched regions were also investigated by friction force microscopy and conductive AFM (C-AFM). The I–V curves show symmetric and linear properties, and Ohmic contacts were formed. These results indicate that AFM mechanical lithography is a powerful tool for fabricating novel metal-semiconductor nanoelectronic Devices. Content Type Journal Article DOI 10.1007/s11433-008-0155-x Authors XiaoYang Zhu, Henan University Key Laboratory for Special Functional Materials Kaifeng 475004 China Gang Cheng, Henan University Key Laboratory for Special Functional Materials Kaifeng 475004 China ShuJie Wang, Henan University Key Laboratory for Special Functional Materials Kaifeng 475004 China ShuXi Dai, Henan University Key Laboratory for Special Functional Materials Kaifeng 475004 China ShaoMing Wan, Henan University Key Laboratory for Special Functional Materials Kaifeng 475004 China XingTang Zhang, Henan Uni ...

Source: www.marketwire.com --- 2 days ago
EVERETT, WA (MARKET WIRE) Fluke Corporation has introduced the Fluke A40B Precision Current Shunt Set, an array of precision Devices designed to simplify the task of making precision current measurements in the Laboratory. ...

Source: www.marketwire.com --- 1 day ago
EVERETT, WA (MARKET WIRE) Fluke Corporation has introduced the Fluke A40B Precision Current Shunt Set, an array of precision Devices designed to simplify the task of making precision current measurements in the Laboratory. ...

Source: www.ajc.com --- 1 day ago
"Why can't I remember that?" John Frangioni said recently as he puzzled over one of the important figures from his childhood: Did the bionic man on the '70s television show cost $6 million or $7 million? Either way, the money is a side note (Steve Austin was the "Six Million Dollar Man," by the way). What was important was "the idea that you could help people by building Devices," Frangioni said recently in his basement Laboratory in Boston's Beth Israel Deaconess Medical Center, where he is building a device that could potentially help lots and lots of people. "That show had a huge influence on me," he said, laughing. "But really, the idea has stayed with me - that you could have an impact by applying physical sciences to medicine." ...

Source: stacks.iop.org --- 18 days ago
Author(s): Luan Su-Zhen and Liu Hong-Xia Affiliation(s): School of Microelectronics, Xidian University, Xi'an 710071, China; Key Laboratory of Ministry of Education for Wide Band-Gap Semiconductor Materials and Devices, Xi'an 710071, China ...

Source: stacks.iop.org --- 18 days ago
Author(s): Zhang Li, He Qing, Xu Chuan-Ming, Xue Yu-Ming, Li Chang-Jian and Sun Yun Affiliation(s): The Tianjin Key Laboratory for Photoelectronic Thin Film Devices and Technology, Nankai University, Tianjin 300071, China ...

Source: www.physorg.com --- 31 days ago
Scientists at the U.S. Department of Energy's Lawrence Berkeley National Laboratory and the University of California at Berkeley have created the world's first all-integrated sensor circuit based on nanowire arrays, combining light sensors and electronics made of different crystalline materials. Their method can be used to reproduce numerous such Devices with high uniformity. ...