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Displaying 31426 - 31450 of 143806

Frequency-tunable Superconducting Resonators via Nonlinear Kinetic Inductance

August 13, 2015

Author(s)

Michael Vissers, Johannes Hubmayr, Jiansong Gao, Martin Sandberg, Saptarshi Chaudhuri, Clint Bockstiegel

We have designed, fabricated and tested a frequency-tunable high-Q superconducting resonator made from niobium titanium nitride film. The frequency tunability is achieved by injecting a DC current through a special current-directing circuit into the

Implementing and Managing Policy Rules in Attribute Based Access Control

August 13, 2015

Author(s)

Chung Tong Hu, David F. Ferraiolo, David R. Kuhn, Raghu N. Kacker, Yu Lei

Attribute Based Access Control (ABAC) is a popular approach to enterprise-wide access control that provides flexibility suitable for today's dynamic distributed systems. ABAC controls access to objects by evaluating policy rules against the attributes of

Physical implementation of coherently-coupled oscillator networks

August 13, 2015

Author(s)

Matthew R. Pufall, William H. Rippard, Gyorgy Csaba, Wolfgang Porod, George Bourianoff, Dmitri Nikonov

We present a combined experimental and simulation study of the physical implementation of coherently coupled oscillator networks composed of spin-torque oscillators (STOs). Based on published works and on our recent experiments, we review the behavior of

Recommendation for Random Number Generation Using Deterministic Random Bit Generators

August 13, 2015

Author(s)

Elaine B. Barker, Larry Feldman, Gregory A. Witte

This bulletin summarizes the information presented in NIST SP 800-90A, Revision 1. The publication specifies mechanisms for the generation of random bits using deterministic methods. The methods provided are based on either hash functions or block cipher

Reference Correlations of the Thermal Conductivity of Cyclopentane, iso-Pentane, and n-Pentane

August 13, 2015

Author(s)

Cristina M. Vassiliou, Marc J. Assael, Marcia L. Huber, Richard A. Perkins

New, wide range reference equations for the thermal conductivity of cyclopentane, iso-pentane and n-pentane are presented. The equations are based in part upon a body of experimental data that has been critically assessed for internal consistency and for

Uncoordinated Scheduling Strategies for BAN-to-BAN Interference Mitigation

August 13, 2015

Author(s)

Kamran Sayrafian, Martina Barbi, Mehdi Alasti

A Body Area Network (BAN) is a radio standard for wireless connectivity of wearable and implantable sensors located inside or in close proximity to the human body. Medical and some other applications impose stringent constraints on battery powered BAN

A Flexible Microporous Hydrogen-Bonded Organic Framework for Gas Sorption and Separation

August 12, 2015

Author(s)

Hailong Wang, Bin Li, Hui Wu, Tong-Liang Hu, Zizhu Yao, Wei Zhou, Shengchang Xiang, Banglin Chen

A microporous three-dimensional hydrogen-bonded organic framework (HOF-5) has been constructed from a new organic linker 4,4'r", r"'(2,4-diamino-1,3,5-triazin-6-yl)tetraphenylethene. Activated HOF-4a exhibits a stepwise N 2 adsorption isotherm at 77 K

Additive Manufacturing Round Robin Protocols: A Pilot Study

August 12, 2015

Author(s)

Shawn P. Moylan, Joshua Land, Antonio M. Possolo

As the number of users of additive manufacturing (AM) steadily increases, and considering their demand for material and process specifications, the need for standard protocols for round robin studies is increasing accordingly. Researchers at the National

Post hoc Interlaboratory Comparison of Single Particle ICP-MS Size Measurements of NIST Gold Nanoparticle Reference Materials

August 12, 2015

Author(s)

Antonio R. Montoro Bustos, Elijah J. Petersen, Antonio M. Possolo, Michael R. Winchester

Single particle inductively coupled plasma-mass spectrometry (spICP-MS) is an emerging technique that enables simultaneous measurement of nanoparticle size and number quantification of metal-containing nanoparticles at realistic environmental exposure

Stable explicit stepwise marching scheme in ill-posed time-reversed viscous wave equations

August 12, 2015

Author(s)

Alfred S. Carasso

The numerical computation of ill-posed, nonlinear, multidimensional initial value problems presents considerable difficulties. Conventional stepwise marching schemes for such problems, whether explicit or implicit, are necessarily unconditionally unstable

Tolerance Specification and Related Issues for Additively Manufactured Products

August 12, 2015

Author(s)

Gaurav Ameta, Robert R. Lipman, Paul W. Witherell, Shawn P. Moylan

Additive manufacturing (AM) has gained increased attention in the last decade as a versatile manufacturing process for customized products. AM process can create complex free-form shapes, internal cavities and lattices, which are either not feasible or

TOWARDS AN INTEGRATED DATA SCHEMA DESIGN FOR ADDITIVE MANUFACTURING: CONCEPTUAL MODELING

August 12, 2015

Author(s)

Yan Lu, Sangsu Choi, Paul W. Witherell

Large amounts of data are generated, exchanged, and used during an additive manufacturing (AM) build. While the AM data from a single build is essential for establishing part traceability, when methodically collected, the full processing history of

Calibration of Cryogenic Resistance Thermometers between 0.65 K and 165 K on the International Temperature Scale of 1990

August 11, 2015

Author(s)

Weston L. Tew

Calibrations of cryogenic resistance thermometers at NIST are performed by comparison to standard thermometers on the International Temperature Scale of 1990 (ITS-90). The NIST Low Temperature Calibration Facility (LTCF) can accommodate most capsule and

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