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Search Publications

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Displaying 17701 - 17725 of 74061

Prediction and Validation of Diffusion Coefficients in a Model Drug Delivery System Using Microsecond Atomistic Molecular Dynamics Simulation and Vapor Sorption Analysis

October 21, 2014
Author(s)
Christopher Forrey, D M. Saylor, Joshua S. Silverstein, Jack F. Douglas, Eric Davis, Yossef A. Elabd
Diffusion of small to medium sized molecules in polymeric medical device materials underlies a broad range of public health concerns related to unintended leaching from or uptake into implantable medical devices. Knowledge of diffusion rates is thus

Tunable Cobalt Vacancies and Related Properties in LaCo x As 2

October 21, 2014
Author(s)
Shijie Shen, Gang Wang, Shifeng Jin, Qingzhen Huang, Tianping Ying, Dandan Li, Xiaofang Lai, Tingting Zhou, Han Zhang, Zhiping Lin, Xiaozhi Wu, Xiaolong Chen
The origin of transition metal vacancies and their effects on the properties of ThCr 2Si 2-type compounds have been less studied and poorly understood. Here we carefully investigate the structure, physical properties, and electronic structure for a series

Nucleation of Graphene and Its Conversion to Single Walled Carbon Nanotube

October 20, 2014
Author(s)
Matthieu C. Picher, Pin A. Lin, Gomez-Ballesteros L. Jose, Perla Balbuena, Renu Sharma
Nucleation is a critical stage for controlling the molecular building blocks into desired functional crystalline structures. For example, chirality of a single-walled carbon nanotube is determined at nucleation stage when the growing graphene sheet wraps

Structural Model of an mRNA in Complex with the Bacterial Chaperone Hfq

October 20, 2014
Author(s)
Yi Peng, Joseph E. Curtis, Xianyang Fang, Sarah A. Woodson
Small non-coding (s)RNAs and their chaperone protein Hfq regulate bacterial gene expression in response to stress and other environmental signals. Hfq binds specific RNA sequence motifs and facilitates base pairing between complementary sRNA-mRNA pairs

Structure of Flocs of Latex Particles Formed by Addition of Protein from Moringa Seeds

October 20, 2014
Author(s)
Maja S. Hellsing, Habauka M. Kwaambwa, Fiona M. Nermark, Bonang B. M. Nkoane, Andrew J. Jackson, Matthew John Wasbrough, Ida Berts, Lionel Porcar, Adrian R. Rennie
Proteins extracted from the seeds of Moringa trees are effective flocculents for particles dispersed in water and they are attractive as a natural and sustainable product for water purification. Studies with a model system consisting of polystyrene latex

Streamlining the Additive Manufacturing Digital Spectrum: A Systems Approach

October 18, 2014
Author(s)
Duck B. Kim, Paul Witherell, Robert R. Lipman, Shaw C. Feng
Additive Manufacturing (AM) provides great potential for industrial manufacturers who require low volume and functional, highly complex end use products. Given AM's potential, numerous research efforts are underway to reduce the time and improve the

Digital Repository of Mathematical Formulae

October 17, 2014
Author(s)
Howard S. Cohl, Marjorie A. McClain, Bonita V. Saunders, Moritz Schubotz, Janelle Williams
The purpose of the NIST Digital Repository of Mathematical Formulae (DRMF) is to create a digital compendium of mathematical formulae for orthogonal polynomials and special functions (OPSF) and of associated mathematical data. The DRMF addresses needs of

Simulations of an Attic Fire in a Wood Frame Residential Structure-Chicago, IL

October 17, 2014
Author(s)
Craig G. Weinschenk, Daniel M. Madrzykowski, Kristopher J. Overholt
The Fire Dynamics Simulator (FDS) fire model, which is developed and maintained by the National Institute of Standards and Technology (NIST), was used to provide insight into the dynamics of a fire that occurred on November 2, 2012, within a 2 1⁄2 story

A geometric description of nonreciprocity in coupled two-mode systems

October 16, 2014
Author(s)
Leonardo M. Ranzani, Jose A. Aumentado
We explore the concept of nonreciprocity in coupled two-mode systems using a geometric mapping to the Poincaré sphere. From this perspective, we recast the requirements for nonreciprocity in terms of rotation and inversion symmetry arguments for the vector

Challenges of Irradiance-mode Spectral Response Measurements

October 16, 2014
Author(s)
Behrang H. Hamadani, John F. Roller, Brian P. Dougherty, Howard W. Yoon
Irradiance-mode spectral response measurements of solar cells are important because they provide a direct, reliable and accurate route for determination of the short circuit current (Isc) of solar cells under air mass 1.5 standard reference spectrum. In

Faceting Control in Core/Shell GaN micropillars using Selective Epitaxy

October 15, 2014
Author(s)
Sergiy Krylyuk, Heayoung Yoon, Baomei Wen, Abhishek Motayed, Albert Davydov, Matt N. King
We report on fabricating large-area, vertically aligned GaN epitaxial core-shell micropillar arrays. The two-step process consisted of inductively coupled plasma (ICP) etch of lithographically patterned n-type GaN substrate followed by selective growth of

gamma-prime Phase Stability and Phase Equilibrium in Ternary Co-W-Al at 900 degC

October 15, 2014
Author(s)
Eric Lass, Maureen E. Williams, Carelyn E. Campbell, Kil-Won Moon, Ursula R. Kattner
Phase equilibria at 900 °C in the Co-rich Co-W-Al ternary system is investigated through isothermal annealing of six alloy compositions for times up to 8000 h. The volume fraction of the L12-gamma-prime phase co-existing with disordered FCC-gamma, B2 and

High-Power and High-Linearity Photodetector Modules for Microwave Photonic Applications

October 15, 2014
Author(s)
Frederick N. Baynes, Efthymios Rouvalis, Xiaojun Xie, Qiugui Zhou, Franklyn J. Quinlan, Tara M. Fortier, Scott A. Diddams, Andreas G. Steffan, Andreas Beling, Joe C. Campbell
We demonstrate hermetically packaged InGaAs/InP photodetector modules for high performance microwave photonic applications. The devices employ an advanced photodiode epitaxial layer known as the modified uni-traveling carrier photodiode (MUTC-PD) with

Mechanical property changes in porous low-k dielectric thin films during processing

October 15, 2014
Author(s)
Gheorghe Stan, Richard S. Gates, Premsagar P. Kavuri, Jessica Torres, David Michalak, Canay Ege, Jeff Bielefeld, Sean W. King
The design of future generations of Cu-low-k dielectric interconnects with reduced electronic crosstalk often requires engineering materials with an optimal trade off between their dielectric constant and elastic modulus. This is because the benefits

Modeling RP-1 fuel advanced distillation data using comprehensive two-dimensional gas chromatography coupled with time-of-flight mass spectrometry and partial least squares analysis

October 15, 2014
Author(s)
Thomas J. Bruno, Benjamin Kehimkar, Brendon Parsons, Jamin C. Hoggard, M. C. Billingsley, R. E. Synovec
Recent efforts in predicting rocket propulsion (RP-1) fuel performance through modeling put greater emphasis on obtaining detailed and accurate fuel properties, as well as to elucidate the relationships between fuel composition and their properties. Herein
Displaying 17701 - 17725 of 74061