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Displaying 176 - 200 of 550

Electrochemical capacitance of CO-terminated Pt(111) is dominated by CO-solvent gap

October 17, 2017
Author(s)
Ravishankar Sundararaman, Marta C. Figueiredo, Marc Koper, Kathleen Schwarz
The distribution of electric fields within the electrochemical double layer depends on both the electrode and electrolyte in complex ways. These fields strongly influence chemical dynamics in the electrode-electrolyte interface, but cannot be measured

Towards Detecting Data Integrity Attacks in Smart Grid

October 6, 2017
Author(s)
Linqiang Ge, Wei Yu, Paul Moulema, Guobin Xu, David W. Griffith, Nada T. Golmie
An effective operation of the smart grid relies on the integration of sensing, computing, and communication. Attempting to disrupt the system, an adversary may launch cyber-attacks against the smart grid by compromising components, including meters

Small Changes Yield Large Results at NIST's Net-Zero Energy Residential Test Facility

September 28, 2017
Author(s)
Arthur H. Fanney, William V. Payne, Joshua D. Kneifel, Lisa C. Ng, Brian P. Dougherty, Tania Ullah, William M. Healy, Farhad Omar
The National Institute of Standards and Technology (NIST) has embarked on a multi-year project to establish that a residence can generate, through the use of renewables, the same amount of energy as it consumes while meeting the energy needs of a typical

Crystallographic Studies of Ba12Nb8-xTaxCo4O36 (x=1,3,4,5,7)

July 21, 2017
Author(s)
Winnie K. Wong-Ng, Guangyao Liu, Igor Levin, Izaak Williamson, James A. Kaduk, Lan Li, Andres C. Hernandez
Crystal structures and X-ray reference powder diffraction patterns have been determined for the Ba12Nb8-xTaxCo4O36 (x = 1, 3, 4, 5, 7) series. Ba12Nb8-xTaxCo4O36 crystallize in the cubic perovskite structure with a space group Pm3m (No. 221) and the

Frequency response of the external quantum efficiency in multijunction solar cells

June 29, 2017
Author(s)
Nicolas Marquez Peraca, D T. Bilir, Behrang Hamadani
The frequency dependence of the external quantum efficiency (EQE) of high-quality multijunction solar cells was examined by the modulated photocurrent spectroscopy method via an optical setup comprised of a light-pipe-coupled compact LED array. The optical

CYBER-PHYSICAL SYSTEM DEVELOPMENT ENVIRONMENT FOR ENERGY APPLICATIONS

June 28, 2017
Author(s)
Thomas P. Roth, Yuyin Song, Martin J. Burns, Himanshu Neema, William Emfinger, Janos Sztipanovits
Cyber-physical systems (CPS) are smart systems that consist of highly interconnected networks of physical and computational components. The tight integration of a wide range of heterogeneous components enables new functionality and quality of life

Chamber for Mechanical Testing in H2 with Observation by Neutron Scattering

June 1, 2017
Author(s)
Matthew J. Connolly, Peter E. Bradley, Andrew J. Slifka, Elizabeth S. Drexler
A gas-pressure chamber has been designed, constructed, and tested at a moderate pressure (3.4 MPa, 500 psi) and has the capability of mechanical loading of steel specimens for neutron scattering measurements. The chamber will allow a variety of in situ

CH3NH3PbI3 perovskites: Ferroelasticity revealed

April 14, 2017
Author(s)
Evgheni Strelcov, Qingfeng Dong, Tao Li, Jungseok Chae, Yuchuan Shao, Yehao Deng, Alexei Gruveman, Jinsong Huang, Andrea Centrone
Ferrolectricity has been proposed as a plausible meachanism to explain the high photovoltaic conversion efficiency in organic-inorganic perovskites; however, convincing experimental evidence in support to this hypothesis is still missing. Identifying and

Space-Time Approach for Disturbance Detection and Classification

March 9, 2017
Author(s)
Hamid Gharavi
A major challenge facing future grid systems is to identify the source of abnormal behaviors caused by faults or voltage instability. In this paper Phasor Measurement Units (PMUs) have been considered for detecting disturbances and degradation in the grid

Deconvoluting the Influences of 3D Structure on the Performance of Photoelectrodes for Solar-Driven Water Splitting

February 7, 2017
Author(s)
Daniel V. Esposito, Youngmin Lee, Heayoung Yoon, Paul M. Haney, Natalie Labrador, Thomas P. Moffat, A. A. Talin, Veronika A. Szalai
Abstract Three-dimensionally (3D) structured photoelectrodes offer a number of potential benefits for solar fuels production compared to conventional planar photoelectrodes, including decreased optical losses, higher surface area for catalysis, more facile

Tuning flexibility to control selectivity in soft porous crystals

January 31, 2017
Author(s)
Nathan Mahynski, Vincent K. Shen
We use flat-histogram Monte Carlo simulations to study how changing the flexibility of soft porous crystals (SPCs) affects their selective adsorption of a binary, size-asymmetric supercritical fluid. Specifically, we consider mesoporous SPCs which have

Transactive Energy Application Landscape Scenarios

December 15, 2016
Author(s)
David G. Holmberg, David Hardin, Ronald Melton, Ron Cunningham, Steve Widergren
This paper presents an analysis of the transactive energy (TE) application landscape, specifically examining the transactive process, business functions, actors in different smart grid (SG) application domains, and time scales. These process steps
Displaying 176 - 200 of 550