WorldCat Identities

U.S. Army Research Laboratory

Overview
Works: 1,621 works in 1,970 publications in 1 language and 118,916 library holdings
Genres: Periodicals 
Classifications: U394.A34, 355.070973
Publication Timeline
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Publications about U.S. Army Research Laboratory Publications about U.S. Army Research Laboratory
Publications by U.S. Army Research Laboratory Publications by U.S. Army Research Laboratory
Most widely held works about U.S. Army Research Laboratory
 
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Most widely held works by U.S. Army Research Laboratory
Annual review ( )
in English and held by 260 WorldCat member libraries worldwide
Preserving the environment through technology ( Book )
3 editions published between 1993 and 1995 in English and held by 229 WorldCat member libraries worldwide
Applying the principles of the Government Performance and Results Act to the research and development function a case study submitted to the Office of Management and Budget by U.S. Army Research Laboratory ( )
1 edition published in 1996 in English and held by 211 WorldCat member libraries worldwide
An investigation of factors affecting multi-task performance by Teresa A Branscome ( )
2 editions published in 2007 in English and held by 211 WorldCat member libraries worldwide
"This report presents the results of the first in a series of investigations designed to increase fundamental knowledge and understanding of the factors affecting multi-task performance in a military environment. The primary objective of this laboratory experiment was to measure and quantify the effects of individual differences on human performance in a multi-task environment. The secondary objective was to observe the effects of previous computer experience and practice and to determine which relationships, if any, exist between personality and self-efficacy traits and multi-task performance. In this study, each of 76 civilian and military participants completed a battery of questionnaires designed to gather information about individual differences. Included were a demographics questionnaire that solicited information regarding age, gender, vision and hearing, military service, and computer use and experience; the Zuckerman-Kuhlman Personality Questionnaire Form III which identifies five components of personality in five subscales including activity, aggression-hostility, sociability, neuroticism-anxiety, and impulsive risktaking; the polychronicity scale which measures the extent to which individuals prefer working on several tasks at once as opposed to working on only one task at a time; and the Situational Self-Efficacy (SSE) scale which measures the participants' level of confidence in their ability to do a task well. After completion of the questionnaires, multi-task performance was measured using SYNWORK (Synthetic Work Environment), a computer-based synthetic work environment that runs on a personal computer or a laptop (Elsmore, 1994). Participants were required to work simultaneously on four distinct tasks that were presented on a computer screen: Sternberg memory, three-column addition, visual tracking, and signal discrimination. These tasks required continuous attention and involved memory, arithmetic processing, and visual and auditory monitoring. Pearson correlation coefficients were computed to determine relationships between questionnaire responses and SYNWORK scores. Overall SYNWORK scores showed a significant negative correlation with age group, neuroticism, and impulsivity, and a significant positive correlation with trial. In addition, significant positive correlations existed between total SYNWORK scores and components of the polychronicity scale. Results indicated that participants who preferred working on several projects at a time scored higher overall on the SYNWORK task. Multivariate analyses conducted on individual and overall task performance measures indicated a significant interaction between age group and trial. Consistent with our expectations, it was found that initially, younger adults performed better on multi-task performance, but all age groups improved performance with practice. Multiple regression analyses were conducted on overall task performance measures. The variable that is consistently retained at the end of the stepwise regression analyses is the N-Anxiety subscale of the personality questionnaire. Those less prone to emotional upsets or worrying performed better at multi-task monitoring than people who were more reactive and sensitive to criticism. When age, education level, and neuroticism were included in the model, 32.5% of the variance was explained. Cluster analysis was used to examine the effect of individual differences on the performance outcome. An analysis of the SSE variable revealed two distinct groups of individuals with high and low levels of confidence in their ability to do well. Post hoc analyses indicated that people who reported high SSE performed significantly better at multitask monitoring than those who reported lower SSE level."
Army Research Laboratory, ARL : providing America's soldiers the technology edge ( Book )
4 editions published in 1993 in English and held by 209 WorldCat member libraries worldwide
Describes the Army Research Laboratory (ARL) at the Aberdeen Proving Ground (Maryland) information server, which proposes to enable scientists and researchers from government, academia, and industry to discover information about the ARL. Provides information about ARL online services, technology transfer opportunities, announcements and directories. Also features general information and announcements about the Department of Defense High Performance Computing Modernization Program, the Future Technologies Institute, and ARL facilities and research, as well as information about the directorates of the Army Research Laboratory
Owning the Weather ( Book )
2 editions published between 1993 and 1994 in English and held by 197 WorldCat member libraries worldwide
The present state of amperometric nanowire sensors for chemical and biological detection by M. H Ervin ( )
2 editions published in 2006 in English and held by 193 WorldCat member libraries worldwide
This report reviews the research in chemical sensing at the nanometer scale using amperometric detection focusing on publications from January 2004 to September 2005. The devices discussed fall into two categories: chemresistors and chemFETs. In either configuration, the number of carriers available in the channel, and hence the device's transconductance, changes as a function of analyte exposure. Devices based on inorganic nanowires (specifically limited to metal oxides and silicon), conductive organic polymer fibers, and carbon nanotubes are discussed as issues of sensitivity, selectivity, response/refresh times, etc
Evaluation of a high resolution wind model over a complex terrain surface by Sam S Chang ( )
2 editions published in 2009 in English and held by 159 WorldCat member libraries worldwide
A complete and comprehensive description of the high resolution wind (HRW) model is presented. The HRW model has been in development at the U.S. Army Research Laboratory, formerly U.S. Army Atmospheric Sciences Laboratory, since 1978. This model is a two-dimensional, diagnostic atmospheric surface-layer wind model with a horizontal grid spacing of the order of 100 m over a domain of about 5 by 5 km. It uses Gauss? principle of least constraint and a direct variational relaxation method to adjust an initially uniform wind field to conform with topography, mass conservation, and buoyancy forces. A distinctive feature of the model is the use of a non-orthogonal, terrain following, warped coordinate system. A valuable observational dataset of surface wind has been provided from the field study of Meteorology and Diffusion Over Non-Uniform Areas (MADONA) at Porton Down, Salisbury, England during September and October 1992. Using the MADONA data, a critical evaluation for the HRW model for 39 cases has been carried out. The results of this study are presented, indicating both the range of validity and the limitations of the HRW model
Modeling and design of mixed-coherence optical stacks by William Beck ( )
2 editions published in 2012 in English and held by 158 WorldCat member libraries worldwide
A new high-speed, high-cycle, gear-tooth bending fatigue test capability ( )
1 edition published in 2011 in English and held by 148 WorldCat member libraries worldwide
An experimental investigation of the influence of the lubricant viscosity and additives on gear wear by T. L Krantz ( )
1 edition published in 2005 in English and held by 147 WorldCat member libraries worldwide
Evaluation of carburized and ground face gears ( )
1 edition published in 1999 in English and held by 147 WorldCat member libraries worldwide
Experimental durability tests were performed on carburized and ground AISI 9310 steel face gears. The tests were in support of a Defense Advanced Research Projects Agency (DARPA) Technology Reinvestment Program (TRP) to enhance face-gear technology. The tests were conducted in the NASA Glenn spiral-bevel-gear/face-gear test facility. Tests were run at 2300 rpm face gear speed and at loads of 64, 76, 88, 100, and 112-percent of the design torque of 377 N-m (3340 in-lb). The carburized and ground face gears demonstrated the required durability when run for ten-million cycles at each of the applied loads. Proper installation was critical for the successful operation of the spur pinions and face gears. A large amount of backlash produced tooth contact patterns that approached the inner-diameter edge of the face-gear tooth. Low backlash produced tooth contact patterns that approached the outer-diameter edge of the face-gear tooth. Measured backlashes in the range of 0.178 to 0.254 mm (0.007 to 0.010 in) produced acceptable tooth contact patterns
Stabilizing gyroscopic modes in magnetic-bearing-supported flywheels by using cross-axis proportional gains ( )
1 edition published in 2006 in English and held by 147 WorldCat member libraries worldwide
Effects of gas turbine component performance on engine and rotary wing vehicle size and performance by Gregory Paul Herrick ( )
1 edition published in 2010 in English and held by 146 WorldCat member libraries worldwide
Application of a Constant Gain Extended Kalman Filter for in-flight estimation of aircraft engine performance parameters by Takahisa Kobayashi ( )
1 edition published in 2005 in English and held by 146 WorldCat member libraries worldwide
Numerical comparison of NASA's dual Brayton power generation system performance using CO₂ or N₂ as the working fluid by Albert K Owen ( )
1 edition published in 2010 in English and held by 146 WorldCat member libraries worldwide
Simulating fatigue crack growth in spiral bevel pinion by Ani Ural ( )
1 edition published in 2003 in English and held by 145 WorldCat member libraries worldwide
New results for predicting crack trajectory and fatigue life for a spiral bevel pinion using the Finite Element Method (FEM) are reported. The predictions presented are based on linear elastic fracture mechanics combined with the FEM, incorporating plasticity induced fatigue crack closure and moving gear tooth loads. The analyses were carried out using a parallel FEM solver, which calculates stress intensity factors using equivalent domain J-integral method. Fatigue life predictions were made based on a modified Paris model incorporating crack closure. To obtain a more detailed understanding of the contact between a cracked pinion tooth in mesh with an uncracked gear tooth, three-dimensional contact analyses were performed on a spiral bevel gear set incorporating a crack. The goal in carrying out these analyses was to capture the redistribution of contact loads due to crack growth. Results of these analyses showed the expected trend of decreasing tooth loads carried by the cracked tooth with increasing crack length. It was also showed that this decrease in contact loads bad an impact on the stress intensity factor values and therefore would also affect the crack trajectory and fatigue life predictions
Stability limits of a PD controller for a flywheel supported on rigid rotor and magnetic bearings ( )
1 edition published in 2006 in English and held by 145 WorldCat member libraries worldwide
ARL annual review ( )
in English and held by 139 WorldCat member libraries worldwide
Hot-metal simulating igniter for in-bed thermal initiation of granular charges by Stephen L Howard ( )
1 edition published in 2010 in English and held by 137 WorldCat member libraries worldwide
An igniter simulating the effects of penetrating hot-metal fragments into a granular propellant bed was designed, constructed, and tested. This primer was designed to facilitate the characterization of the ignition and early-time combustion processes in a large-caliber propellant charge confined in a closed chamber which was initiated by an in-bed hot ignition source. The primer was used to simulate the situation when charge ignition occurs by a hot fragment that penetrated the chamber wall and remained within the propellant bed. Experiments showed that an igniter composed of micron-sized particle thermite powder (Al/Fe2O3) surrounded by ball powder propellant contained in a cloth tube initiated simultaneously by multiple electrical matches was capable of providing proper ignition stimulus to the propellant charge
 
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Alternative Names

controlled identity U.S. Army Ballistic Research Laboratory

controlled identity United States. Army Laboratory Command

AMSRL
ARL
ARL Abkuerzung
Army Research Laboratory (U.S.)
Australia. Aeronautical Research Laboratory
Australia. Dept. of Defence. Aeronautical Research Laboratory
United States. Aeronautical Research Laboratories
United States. Aeronautical Research Laboratory
United States. Air Force. Aeronautical Research Laboratories
United States. Army. Research Laboratory
United States Research Laboratory
United States. Wright Air Development Division. Aeronautical Research Laboratory
US Army Research Laboratory
USA Air Force Research Division Aeronautical Research Laboratory
USARL
Languages
English (70)
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