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Displaying 25226 - 25250 of 73885

Searching for applications with a fine-toothed comb

April 1, 2011
Author(s)
Nathan R. Newbury
Frequency combs, like many ground-breaking technologies, are simple in concept; they results from the spectrum of any regular train of optical pulses. What is remarkable is that this simple picture can be actually realized in a number of different

Wolter Optics for Neutron Focusing

April 1, 2011
Author(s)
David F. Mildner, M. V. Gubarev
Focusing optics based on Wolter optical geometries developed for x-ray grazing incidence beams can be designed for neutron beams. Wolter optics are formed by grazing incidence reflections from two concentric conic sections (for example, a paraboloid and a

Information Leakage Through the Domain Name System

March 31, 2011
Author(s)
Scott W. Rose, Anastase Nakassis, Ramaswamy Chandramouli
The Domain Name System (DNS) is the global lookup service for network resources. It is often the first step in an Internet transaction as well as a network attack. An attacker can query an organization's DNS as reconnaissance before attacking hosts on a

Introduction of a DC Bias into a High-Q Superconducting Microwave Cavity

March 31, 2011
Author(s)
Rimberg J. Alex, Fei Chen, Adam J. Sirois, Raymond Simmonds
We report a technique for applying a dc voltage or current bias to the center conductor of a high-quality factor superconducting microwave cavity without significantly disturbing selected cavity modes. This is accomplished by incorporating dc bias lines

X-ray Emission Spectroscopy of Nitrogen-rich Compounds

March 31, 2011
Author(s)
Terrence J. Jach, Fernando D. Vila, W. T. Elam, J. D. Denlinger, John J. Rehr
Non-resonant x-ray emission spectroscopy was used to compare the nitrogen-rich compounds ammonium nitrate, trinitrotoluene, and cyclotrimethylene-trinitramine. They are representative of crystalline and molecular structures of special importance in

An electronic measurement of the Boltzmann constant

March 30, 2011
Author(s)
Samuel P. Benz, Alessio Pollarolo, Jifeng Qu, Horst Rogalla, Chiharu Urano, Weston L. Tew, Paul D. Dresselhaus, D. R. White
The Boltzmann constant was measured by comparing the Johnson noise of a resistor at the triple point of water with a quantum-based voltage reference signal generated with a superconducting Josephson-junction waveform synthesizer. The measured value of k =

Electron Ionization Mass Spectra of Alkylated Sulfabenzamides

March 30, 2011
Author(s)
Nino G. Todua, Kirill V. Tretyakov, Roman S. Borisov, Dmitry I. Zhilyaev, Vladimir G. Zaikin, Stephen E. Stein, Anzor I. Mikaia
Mono-, di- and trialkyl derivatives of "sulfabenzamide" (N-4-aminophenylsulfonyl-benzamide) are prepared and their EI mass spectra are examined. It is found that the fragmentation of N- alkylsulfabenzamides (Alkyl = CH3 to n-C5H11) proceeds via a very

Ozone-Depleting Substances (ODSs) and Related Chemicals, Chapter 1 in Scientific Assessment of Ozone Depletion: 2010, Global Ozone Research and Monitoring Project-Report No.52, 516 pp., World Meteorological Organization, Geneva, Switzerland, 2011.

March 30, 2011
Author(s)
Stephen A. Montzka, S. Reimannander, Andreas Engel, Kirstin Kruger, O?Doherty Simon, William T. Sturges , Donald R. Blake , Marcel Dorf Dorf, Paul J. Fraser , Lucien Froidevaux , Kenneth Jucks, Karin Kreher, Michael J. Kurylo III, Abdelwahid Mellouki , John Miller , Ole J. Nielsen , Vladimir L. Orkin, Ronald G. Prinn , Robert Rhew , Michelle L. Santee , Andreas Stohl , Daniel P. Verdonik
The present document will be part of the information upon which the Parties to the United Nations Montreal Protocol will base their future decisions regarding protection of the stratospheric ozone layer. OVERVIEW It has been recognized since the 1970s that

Quantification and Compensation of Unintentional Analyte Aggregation in Electrospray Sampling

March 30, 2011
Author(s)
Mingdong M. Li, Suvajyoti S. Guha, Rebecca A. Zangmeister, Michael J. Tarlov, Michael R. Zachariah
Electrospray (ES) sources are commonly used to introduce non-volatile materials (e.g. nanoparticles, proteins, etc.) in to the gas phase for characterization by mass spectrometry and ion mobility. Recent studies in our group using electrospray ion mobility

The 2010 Materials Research Society (MRS) Fall Meeting

March 30, 2011
Author(s)
Winnie Wong-Ng
The 2010 Materials Research Society (MRS) Fall Meeting took place in the Hynes Convention Center and the Sheraton Boston Hotel, starting the weekend following the Thanksgiving Holidays from November 27 to December 3. This large-scale meeting included forty

Influence of Periodic Patterning on the Magnetization Response of Micromagnetic Structures

March 29, 2011
Author(s)
SangHyun S. Lim, Thomas M. Wallis, Atif A. Imtiaz, Dazhen Gu, Thomas Cecil, Pavel Kabos, Pavol Krivoski
The magnetization dynamics of a single, patterned, thin-film Permalloy (Ni80Fe20, Py) elements embedded in a coplanar waveguide (CPW) are investigated. The anisotropic magnetoresistance (AMR) effect serves as the detection mechanism in current-modulated

Magnetization Reversal Mechanisms in Heusler Alloy Spin Valves

March 29, 2011
Author(s)
T. P. Ginley, Julie Borchers, Brian Kirby, Cindi L. Dennis, Matthew J. Carey, J. R. Childress
Ferromagnetic layers composed of Heusler alloys, which are predicted to be 100% spin polarized in bulk, have been incorporated into spin-valve sensors to improve performance. Transport studies of spin valves containing Co 2MnGe (CMG) in the free and pinned

Effects of shape distortions and imperfections on mode frequencies and collective linewidths in nanomagnets

March 28, 2011
Author(s)
Hans T. Nembach, Justin M. Shaw, Thomas J. Silva, Ward L. Johnson, Sudook A. Kim, Robert D. McMichael, Pavel Kabos
We used Brillouin light scattering to show that shape distortions in Ni80Fe20 nanoelements can have a dramatic effect on the measured linewidth of certain modes. By intentionally introducing an amount of “egg-like” shape distortion to an ideal elliptical
Displaying 25226 - 25250 of 73885
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