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Displaying 10351 - 10375 of 73755

Lower critical solution temperature in polyelectrolyte coacervates

February 26, 2019
Author(s)
Samim Ali, Markus Bleuel, Vivek Prabhu
Model linear oppositely-charged polyelectrolyte complexes exhibit a lower critical solution temperature. The coexist-ence curves narrow with increasing monovalent salt concentration (Cs) that lowers the polymer concentration (Cp) in the polymer-rich phase

Evidence for moire excitons in van der Waals heterostructures

February 25, 2019
Author(s)
Kha Tran, Galan Moody, Travis M. Autry, Kevin L. Silverman, Fengcheng Wu, Junho Choi, Akshay Singh, Jacob Embley, Andre Zepeda, Marshall Cambel, Kyoung Kim, Amritesh Rai, Daniel Sanchez, Takashi Taniguchi, Kenji Watanabe, Li Yang, Nanshu Lu, Sanjay Banerjee, emanuel tutuc, Allan H. MacDonald, Xiaoqin Li
Recent advances in the isolation and stacking of monolayers of van der Waals materials have provided approaches for the preparation of quantum materials in the ultimate two-dimensional limit. In van der Waals heterostructures formed by stacking two

Guide to Attribute Based Access Control (ABAC) Definition and Considerations

February 25, 2019
Author(s)
Chung Tong Hu, David F. Ferraiolo, David R. Kuhn, Adam Schnitzer, Kenneth Sandlin, Robert Miller, Karen Scarfone
[Includes updates as of February 25, 2019] This document provides Federal agencies with a definition of attribute based access control (ABAC). ABAC is a logical access control methodology where authorization to perform a set of operations is determined by

Identification of a mechanogenetic link between substrate stiffness and chemotherapeutic response in breast cancer

February 25, 2019
Author(s)
Brian G. Bush, Scott H. Medina, Emily Sevcik, Maggie Cam, Frank W. DelRio, Kaustav Nandy, Joel P. Schneider
Mechanical feedback from the tumor microenvironment regulates an array of processes underlying cancer biology. For example, increased stiffness of mammary extracellular matrix (ECM) drives malignancy and alters the phenotypes of breast cancer cells

Switchable detector array scheme to reduce the effect of single-photon detector's deadtime in a multi-bit/photon quantum link

February 25, 2019
Author(s)
Cong Liu, YONGXIONG Ren, Jiapeng Zhao, MOHAMMAD MIRHOSSEINI, SEYED RAFSANJANI, GUODONG XIE, Kai Pang, Zhe Zhao, Long Li, Joshua Bienfang, Alan L. Migdall, Todd Brun, Moshe Tur, Robert Boyd, Alan Wilner
We explore the use of a switchable single-photon detector (SPD) array to reduce the effect of individual SPDs' deadtime for a multi-bit/photon quantum link such as M-orbital-angular-momentum (OAM)-encoded one. Our method uses 􀡺 SPDs with a controllable 􀡹 ×

Trustworthy Email

February 25, 2019
Author(s)
Scott W. Rose, J. S. Nightingale, Simson Garfinkel, Ramaswamy Chandramouli
This document gives recommendations and guidelines for enhancing trust in email. The primary audience includes enterprise email administrators, information security specialists and network managers. This guideline applies to federal IT systems and will

Case Study - Exploring Children's Password Knowledge and Practices

February 23, 2019
Author(s)
Yee-Yin Choong, Mary Theofanos, Karen Renaud, Suzanne Prior
Children use technology from a very young age, and often have to authenticate themselves. Yet very little attention has been paid to designing authentication specifically for this particular target group. The usual practice is to deploy the ubiquitous

Femtosecond Optical Two-Way Time-Frequency Transfer in the Presence of Motion

February 22, 2019
Author(s)
Laura C. Sinclair, Hugo Bergeron, William C. Swann, Isaac H. Khader, Kevin C. Cossel, Michael A. Cermak, Nathan R. Newbury, Jean-Daniel Deschenes
Platform motion poses significant challenges to high-precision optical time and frequency transfer. We give a detailed description of these challenges and their solutions in comb-based optical two-way time and frequency transfer (O-TWTFT). Specifically, we

Methods to Characterize 3D Scanners for Forensic Applications

February 22, 2019
Author(s)
Prem K. Rachakonda, Balasubramanian Muralikrishnan
Forensic photography has been one of the most valuable tool for investigators over many decades. They preserve the history of the scene and provide a way for investigators to analyze the scene of interest. However, it is difficult to obtain any objective

A Metal-Organic Framework with Suitable Pore Size and Dual Functionalities for Highly Efficient Post-Combustion CO 2 Capture

February 21, 2019
Author(s)
Hui-Men Wen, Caijun Liao, Libo Li, Ali Alsalme, Zeid Alothman, Rajamani Krishna, Hui Wu, Wei Zhou, Jun Hu, Banglin Chen
Capturing carbon dioxide (Co 2) from flue gases with porous materials has been considered as a viable alternative technology to replace the traditional liquid amine adsorbents. A large number of microporous metal-organic frameworks (MOFs) have been

Mobile Device Security: Cloud and Hybrid Builds

February 21, 2019
Author(s)
Christopher J. Brown, Spike E. Dog, Sallie P. Edwards, Neil C. McNab, Matt Steele, Joshua M. Franklin
This document proposes a reference design on how to architect enterprise-class protection for mobile devices accessing corporate resources. The example solutions presented here can be used by any organization implementing an enterprise mobility management

Retro-Commissioning a Performing Arts Center using HVAC-Cx

February 21, 2019
Author(s)
Natascha S. Milesi-Ferretti, Michael A. Galler, Steven T. Bushby, Robert Leader, J. M. Whitcomb, David W. Rush
This paper presents the use of a semi-automated commissioning tool for the energy retro-commissioning of the Performing Arts Center at Montgomery College in Rockville, Maryland. Researchers and field practitioners collaborated to implement the HVAC-Cx

Scaling of Lipid Membrane Rigidity with Domain Area Fraction

February 21, 2019
Author(s)
Elizabeth G. Kelley, Michihiro Nagao, Paul D. Butler
The elastic properties of cell membranes play a vital role in controlling the morphology changes necessary for cell processes such as endocytosis and cell division. These elastic properties are highly sensitive to the lipid composition and distribution

Characterization of a high-brightness, laser-cooled Li+ ion source

February 20, 2019
Author(s)
Jamie R. Gardner, William R. McGehee, Jabez J. McClelland
Ion sources based on laser cooling have recently provided new pathways to high-resolution microscopy, ion milling, and ion implantation. Here, we present the design and detailed characterization of Li-7 magneto-optical trap ion source (MOTIS) with a peak

Comparison of volumetric and bead-based counting of CD34 cells by single-platform flow cytometry

February 20, 2019
Author(s)
Luisa Saraiva, Lili Wang, Martin Kammel, A. Kummrow, E Atkinson, J Y. Lee, B Yalcinkaya, M Akgoz, A Ruf, A Engel, Yu-Zhong Zhang, O O''Shea, M P. Sassi, C Divieto, T Lekishvili, J J. Campbell, Y Liu, J Wang, R Stebbings, Adolfas Gaigalas, P Rigsby, J Neukammer, S Vessillier
Background: Over 2000 people a year in the UK need a bone marrow or blood stem cell transplant. It is important to accurately quantify the haematopoietic stem cells to predict whether the transplant will be successful in replenishing the immune system

EBIT Observation of Low Charge State Ar Dielectronic Recombination Features Near the Unknown Faint X-Ray Feature Found in the Stacked Spectrum of Galaxy Clusters

February 20, 2019
Author(s)
A. Gall, A. Foster, R. Silwal, Joan M. Dreiling, A. Borovik, E. Kilgore, M. Ajello, John Gillaspy, Yuri Ralchenko, Endre Takacs
Motivated by possible atomic origins of the unidentified emission line detected at 3.55 keV - 3.57 keV in a stacked spectrum of galaxy clusters (Bulbul et al. 2014), an electron beam ion trap (EBIT) was used to investigate resonant dielectronic
Displaying 10351 - 10375 of 73755
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