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Displaying 30576 - 30600 of 74368

Primary Radioactive Gas Standards (Excluding Radon)

October 16, 2008
Author(s)
Michael P. Unterweger
This paper presents an overview of the primary calibration of radioactive gas standards using length-compensated internal gas counters. The principal of length compensation and the effects of high voltage, detector material, and gas pressure are discussed

Processing Phase Diagram of Melt-Dispersed Carbon-Nanotubes

October 16, 2008
Author(s)
Erik K. Hobbie, Jan Obrzut, H Wang, E A. Grulke, D J. Fry
We measure the processing 'phase diagram' of a model carbon-nanotube polymer melt composite in the parameter space of concentration, shear stress, and confinement. With decreasing strain rate, we observe a hierarchy of flow-induced structure, from flow

Progress on low-frequency active vibration isolation

October 16, 2008
Author(s)
S J. Richman
The gravity group at JILA is constructing a three-stage active isolation system to demonstrate useful reduction of low-frequency seismic noise for a gravitational wave interferometer. The control loops on the first two stages are now fully functional in

Properties of Calcium Phosphate Carbonate Cements

October 16, 2008
Author(s)
Milenko Markovic, Shozo Takagi, Laurence C. Chow
The physicochemical and mechanical properties of two calcium phosphate carbonate cements (CPCC-1 and CPCC-2) formed in solution reaction of (1) [alpha]-tricalcium phosphate ([alpha]-TCP),[alpha]-Ca 3(PO 4)d2^, with calcium carbonate, CaCO 3, and (2)

Prospects for a Truly Portable Absolute Gravimeter

October 16, 2008
Author(s)
J E. Faller, A L. Vitouchkine
Absolute gravity measurements offer teh possibility of measuring vertical height changes (the subject of this meeting) at the centimeter level. Today's absolute instruments, though capable of achieving the requisite level of accuracy (1-2 gals), are still

Prospects for mixed-isotope Bose-Einstein condensates in rubidium

October 16, 2008
Author(s)
J P. Burke, J L. Bohn, B D. Esry, C H. Greene
We present quantiative calculations of binary collision parameters for mixtures of ultracold gases of 85Rb and 87Rb atoms. The elastic cross section for pure 85Rb collisions is found to be unusually small in the important temperature range T=0.1-1mK for

Purcell and Local-Field Effects in Dielectric Microcavities

October 16, 2008
Author(s)
A Rahmani, Garnett W. Bryant
We present a general, semi-microscopic, self-consistent treatment of spontaneous emission for a two-level atom in a dielectric microcavity with arbitrary shape and size. Lossless and absorbing media are considered. The approach is based on linear-response

Put NIST Technology Services to Work for You

October 16, 2008
Author(s)
J L. Land
Brochure provides guide for business and industry to access National Institute of Standards and Technology (NIST) services available through Technology Services. Brochure provides contact information and websites and directory on inside back cover.

Quantitative Electron Probe Microanalysis of Rough Targets

October 16, 2008
Author(s)
Dale E. Newbury
Rough samples with topography on a scale that is much greater than the micrometer dimensions of the electron interaction volume present an extreme challenge to quantitative electron beam x-ray microanalysis with energy dispersive x-ray spectrometry

Quantized Rotation of Atoms From Photons With Orbital Angular Momentum

October 16, 2008
Author(s)
Mikkel Andersen, Changhyun Ryu, Pierre Clade, Vasant Natarajan, A Vaziri, Kristian Helmerson, William D. Phillips
Light can carry two kinds of angular momentum: Spin angular momentum (SAM) associated with its polarization and orbital angular momentum (OAM) associated with its spatial mode [1, 2]. The coupling of optical SAM to atoms has been known for over a century

Quantum Charge Fluctuations and the Polarizability of the Single Electron Box

October 16, 2008
Author(s)
Konrad Lehnert, B A. Turek, K Bladh, L F. Spietz, D Gunnarsson, P Delsing
We measure the average charge on a single-electron box, with an accuracy of 10 -3 e as a function of an externally applied potential. At this accuracy, we observe that the total capacitance of the box is a function of temperature, of external potential and

Quantum Teleportation Between Nanomechanical Modes

October 16, 2008
Author(s)
Lin Tian, Stephen Carr
We study a quantum teleportation scheme between two nanomechanical modes without local interaction. The nanomechanical modes are linearly coupled to and connected by the continuous variable modes of a superconducting circuit made of transmission line and
Displaying 30576 - 30600 of 74368
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