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NIST Authors in Bold

Displaying 36076 - 36100 of 73697

Technical Documentation for Survey Administration: Questionnaires, Interviews, and Focus Groups. Federal Building and Fire Safety Investigation of the World Trade Center Disaster (NIST NCSTAR 1-7B) ***DRAFT for Public Comments***

September 1, 2005
Author(s)
Johanna Zmud
This report documents the methods and outcomes of the telephone survey, face-to-face interviews, and focus groups that were conducted in support of the federal building and fire safety investigation of the World Trade Center disaster. In total, 803

Uncertainties in Scaling Factors for ab Initio Vibrational Frequencies

September 1, 2005
Author(s)
Karl K. Irikura, Russell D. Johnson III, Raghu N. Kacker
Vibrational frequencies determined from ab initio calculations are often scaled by empirical factors. An empirical scaling factor partially compensates for the errors arising from vibrational anharmonicity and incomplete treatment of electron correlation

Ventilation Rates in U.S. Office BuildingsFrom the EPA Base Study

September 1, 2005
Author(s)
Andrew K. Persily, J Gorfain, Greg Brunner
The EPA BASE study involved indoor environmental measurements in 100 U.S. office buildings. This paper presents an analysis of the measured outdoor air ventilation rates, including comparisons with the requirements in ASHRAE Standard 62. The outdoor

Visual Evidence, Damage Estimates, and Timeline Analysis (Chapters 1-8). Federal Building and Fire Safety Investigation of the World Trade Center Disaster (NIST NCSTAR 1-5A) ***DRAFT for Public Comments***

September 1, 2005
Author(s)
William M. Pitts, Kathryn M. Butler, Valentine Junker
This report summarizes the collection and analysis of visual material used for the National Institute of Standards and Technology (NIST) World Trade Center (WTC) Investigation. The task consisted of four major subtasks: 1) identification, collection, data

Visual Evidence, Damage Estimates, and Timeline Analysis (NIST NCSTAR 1-5A)Chapter 9-Appendices A-M. Federal Building and Fire Safety Investigation of the World Trade Center Disaster

September 1, 2005
Author(s)
William M. Pitts, Kathryn M. Butler, Valentine Junker
This report summarizes the collection and analysis of visual material used for the National Institute of Standards and Technology (NIST) World Trade Center (WTC) Investigation. The task consisted of four major subtasks: 1) identification, collection, data

What We Think We Know About Ventilation

September 1, 2005
Author(s)
Andrew K. Persily
The amount of outdoor air provided to occupied spaces is one of the most important determinants of indoor air quality, but many critical questions and misunderstandings still exist regarding outdoor air ventilation. First, given the importance of

Contact mechanics and tip shape in afm-based nanomechanical measurements

August 31, 2005
Author(s)
Malgorzata Kopycinska-Mueller, Roy H. Geiss, Donna C. Hurley
Stiffness-load curves obtained in quantitative atomic force acoustic microscopy (AFAM) measurements depend on both the elastic properties of the sample and the geometry of the atomic force microscope (AFM) tip. The geometry of silicon AFM tips changes when

Growth Habits and Defects in ZnO Nanowires Grown on GaN/Sapphire Substrates

August 31, 2005
Author(s)
Igor Levin, Albert Davydov, Babak Nikoobakht, Norman A. Sanford, Pavel Mogilevsky
Growth habits and defects in epitaxial ZnO nanowires grown from Au catalyst on (0001) GaN/sapphire substrate using Vapor-Liquid-Solid (VLS) technique were studied using electron microscopy and X-ray diffraction. The results revealed presence of both

Growth habits and defects in ZnO nanowires grown on GaN/sapphire substrates

August 31, 2005
Author(s)
Igor Levin, Albert Davydov, Babak Nikoobakht, Norman Sanford, Pavel Mogilevsky
Growth habits and defects in epitaxial ZnO nanowires grown from Au catalyst on (00.1) GaN/sapphire substrate using the vapor-liquid-solid (VLS) technique were studied using electron microscopy and x-ray diffraction. The results revealed presence of both

Impedance Control for Critically Coupled Cavities

August 31, 2005
Author(s)
Billy F. Riddle, Craig Nelson
Cavity resonators are often used in low phase noise oscillators that utilize carrier suppression. These oscillators are employed in systems that measure phase noise in frequencies as hight at 100 GHz. In order to achieve the maximum suppression needed in

Protected Elevators and the Disabled

August 31, 2005
Author(s)
Richard W. Bukowski
The NIST investigation into the World Trade Center attacks has renewed interest in the deployment of protected elevators that can be used to facilitate the evacuation of occupants and access by first responders during fires and other emergencies in tall

Relative Permittivity and Loss Tangent Measurement Using the NIST 60 mm Cylindrical Cavity

August 31, 2005
Author(s)
Michael D. Janezic, Jolene D. Splett, Kevin J. Coakley, Raian K. Kaiser, John H. Grosvenor Jr
In order to develop a dielectric Standard Reference Material (SRM), a measurement system for measuring the relative permittivity and loss tangent of dielectric materials is presented. To achieve the necessary level of measurement accuracy, we selected the

RoboCup 2004: Rescue Robot League

August 31, 2005
Author(s)
Adam S. Jacoff, S Tadokoro
This article discusses the RoboCupRescue Robot League competition held this year in Lisbon, Portugal. These annual competitions increase awareness of the challenges involved in urban search and rescue (USAR) applications, provide objective evaluation of

A Comparison of GPS Common-View Time Transfer to All-in-View

August 29, 2005
Author(s)
Marc A. Weiss, G. Petit, Zhiheng Jiang
All-in-view time transfer is being considered to replace common-view for computing the links of International Atomic Time (TAI). Components in all-in-view GPS time transfer that do not cancel as they do in the common-view technique are the satellite clock

A New Microwave Synthesis Chain for the Primary Frequency Standard NIST-F1

August 29, 2005
Author(s)
Thomas P. Heavner, Steven R. Jefferts, Elizabeth A. Donley, F Levi, Thomas E. Parker
We present the design and measurements of the microwave synthesis chain presently used in NIST-F1, the laser-cooled cesium fountain primary frequency standard in operation at NIST, Boulder, CO. This system has been used in two accuracy evaluations of NIST
Displaying 36076 - 36100 of 73697
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