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458 Matching Results
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Phase I Report: DARPA Exoskeleton Program
The Defense Advanced Research Projects Agency (DARPA) inaugurated a program addressing research and development for an Exoskeleton for Human Performance Augmentation in FY!2001. A team consisting of Oak Ridge National Laboratory, the prime contractor, AeroVironment, Inc., the Army Research Laboratory, the University of Minnesota, and the Virginia Polytechnic Institute has recently completed an 18-month Phase I effort in support of this DARPA program. The Phase I effort focused on the development and proof-of-concept demonstrations for key enabling technologies, laying the foundation for subsequently building and demonstrating a prototype exoskeleton. The overall approach was driven by the need to optimize energy efficiency while providing a system that augmented the operator in as transparent manner as possible (non-impeding). These needs led to the evolution of two key distinguishing features of this team's approach. The first is the ''no knee contact'' concept. This concept is dependent on a unique Cartesian-based control scheme that uses force sensing at the foot and backpack attachments to allow the exoskeleton to closely follow the operator while avoiding the difficulty of connecting and sensing position at the knee. The second is an emphasis on energy efficiency manifested by an energetic, power, actuation and controls approach designed to enhance …
Date:
January 21, 2004
Creator:
Jansen, J.F.
Object Type:
Report
System:
The UNT Digital Library
Lithographically-directed self-assembly of nanostructures
The combination of lithography and self-assembly provides apowerful means of organizing solution-synthesized nanostructures for awide variety of applications. We have developed a fluidic assembly methodthat relies on the local pinning of a moving liquid contact line bylithographically produced topographic features to concentratenanoparticles at those features. The final stages of the assembly processare controlled first by long-range immersion capillary forces and then bythe short-range electrostatic and Van der Waal's interactions. We havesuccessfully assembled nanoparticles from 50 nm to 2 nm in size usingthis technique and have also demonstrated the controlled positioning ofmore complex nanotetrapod structures. We have used this process toassemble Au nanoparticles into pre-patterned electrode structures andhave performed preliminary electrical characterization of the devices soformed. The fluidic assembly method is capable of very high yield, interms of positioning nanostructures at each lithographically-definedlocation, and of excellent specificity, with essentially no particledeposition between features.
Date:
September 21, 2004
Creator:
Liddle, J. Alexander; Cui, Yi & Alivisatos, Paul
Object Type:
Article
System:
The UNT Digital Library
Computing Path Tables for Quickest Multipaths In Computer Networks
We consider the transmission of a message from a source node to a terminal node in a network with n nodes and m links where the message is divided into parts and each part is transmitted over a different path in a set of paths from the source node to the terminal node. Here each link is characterized by a bandwidth and delay. The set of paths together with their transmission rates used for the message is referred to as a multipath. We present two algorithms that produce a minimum-end-to-end message delay multipath path table that, for every message length, specifies a multipath that will achieve the minimum end-to-end delay. The algorithms also generate a function that maps the minimum end-to-end message delay to the message length. The time complexities of the algorithms are O(n{sup 2}((n{sup 2}/logn) + m)min(D{sub max}, C{sub max})) and O(nm(C{sub max} + nmin(D{sub max}, C{sub max}))) when the link delays and bandwidths are non-negative integers. Here D{sub max} and C{sub max} are respectively the maximum link delay and maximum link bandwidth and C{sub max} and D{sub max} are greater than zero.
Date:
December 21, 2004
Creator:
Grimmell, W.C.
Object Type:
Report
System:
The UNT Digital Library
Community Land Model Version 3.0 (CLM3.0) Developer's Guide
This document describes the guidelines adopted for software development of the Community Land Model (CLM) and serves as a reference to the entire code base of the released version of the model. The version of the code described here is Version 3.0 which was released in the summer of 2004. This document, the Community Land Model Version 3.0 (CLM3.0) User's Guide (Vertenstein et al., 2004), the Technical Description of the Community Land Model (CLM) (Oleson et al., 2004), and the Community Land Model's Dynamic Global Vegetation Model (CLM-DGVM): Technical Description and User's Guide (Levis et al., 2004) provide the developer, user, or researcher with details of implementation, instructions for using the model, a scientific description of the model, and a scientific description of the Dynamic Global Vegetation Model integrated with CLM respectively. The CLM is a single column (snow-soil-vegetation) biogeophysical model of the land surface which can be run serially (on a laptop or personal computer) or in parallel (using distributed or shared memory processors or both) on both vector and scalar computer architectures. Written in Fortran 90, CLM can be run offline (i.e., run in isolation using stored atmospheric forcing data), coupled to an atmospheric model (e.g., the Community …
Date:
December 21, 2004
Creator:
Hoffman, FM
Object Type:
Report
System:
The UNT Digital Library
WIPP Subsidence Monument Leveling Survey - 2004
Sections 2 through 7 of this report define the result of the 2004 leveling survey through the subsidence monuments at the WIPP site. Approximately 15 miles of leveling was completed through nine vertical control loops. The 2004 survey includes the determination of elevation on each of the 48 existing subsidence monuments and the WIPP baseline survey, and 14 of the National Geodetic Survey's (NGS) vertical control points. The field observations were completed during August through November of 2004 by personnel from the WashingtonTRU Solutions (WTS) Surveying Group, Mine Engineering Department. Additional rod personnel were provided by the Geotechnical Engineering department. Digital leveling techniques were utilized to achieve better than Second Order Class II loop closures as outlined by the Federal Geodetic Control Subcommittee (FGCS). Because it is important to perform the subsidence survey in exactly the same manner each year, WIPP procedure (WP 09-ES4001) details each step of the survey. Starting with the 2002 survey this procedure has been used to perform the subsidence survey. Starting with the survey of the year 2001, Loop 1 and redundant survey connections among the various loops were removed from the survey and report. This resulted in a reduction of fieldwork with no loss …
Date:
December 21, 2004
Creator:
Westinghouse TRU Solutions LLC
Object Type:
Report
System:
The UNT Digital Library
Marble Malls Independent School District: Management and Performance Review
This report "reviews the management and performance of the Marble Falls Independent School District's (MFISD's) educational,financial, and operations. functions" (Legislative Budget Board Letter).
Date:
April 21, 2004
Creator:
Texas. Legislative Budget Board.
Object Type:
Report
System:
The Portal to Texas History
University Press (Beaumont, Tex.), Vol. 80, No. 44, Ed. 1 Wednesday, April 21, 2004
Semiweekly newspaper from Lamar University in Beaumont, Texas that includes local, national, and campus news along with advertising.
Date:
April 21, 2004
Creator:
Gurski, Patrick
Object Type:
Newspaper
System:
The Portal to Texas History
Impacts of Stable Element Intake on C and I Dose Estimates - Implications for Proposed Yucca Mountain Repository
The purpose of this study was to evaluate the influence of the intake of stable isotopes of carbon and iodine on the committed doses due to the ingestion of {sup 14}C and {sup 129}I. This was accomplished through the application of two different computational approaches. The first was based on the assumption that ground (drinking) water was the only source of intake of both {sup 14}C and {sup 129}I and stable carbon and stable iodine. For purposes of the second approach, the intake of {sup 14}C and {sup 129}I was still assumed to be only that in the ground (drinking) water, but the intake of stable carbon and stable iodine was assumed to be that in the drinking water plus other components of the diet. The doses were estimated using either a conversion formula or the applicable dose coefficients in Federal Guidance Reports No. 11 and No. 13. Serving as input for the analyses was the estimated maximum concentration of {sup 14}C or {sup 129}I that would be present in the ground water due to potential releases from the proposed Yucca Mountain high-level radioactive waste repository during the first 10,000 years after closure. The estimated concentrations of stable carbon and …
Date:
December 21, 2004
Creator:
Moeller, Dade W.; Ryan, Michael T.; Sun, Lin-Shen C. & Cherry, Robert N., Jr.
Object Type:
Report
System:
The UNT Digital Library
Mannford Eagle (Mannford, Okla.), Vol. 23, No. 12, Ed. 1 Wednesday, July 21, 2004
Weekly newspaper from Mannford, Oklahoma that includes local, state, and national news along with advertising.
Date:
July 21, 2004
Creator:
Retherford, Bill R.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Cherokeean Herald (Rusk, Tex.), Vol. 154, No. 48, Ed. 1 Wednesday, January 21, 2004
Weekly newspaper from Rusk, Texas that includes local, state and national news along with extensive advertising.
Date:
January 21, 2004
Creator:
Whitehead, Marie
Object Type:
Newspaper
System:
The Portal to Texas History
Cherokeean Herald (Rusk, Tex.), Vol. 155, No. 22, Ed. 1 Wednesday, July 21, 2004
Weekly newspaper from Rusk, Texas that includes local, state and national news along with extensive advertising.
Date:
July 21, 2004
Creator:
Whitehead, Marie
Object Type:
Newspaper
System:
The Portal to Texas History
Cherokeean Herald (Rusk, Tex.), Vol. 155, No. 9, Ed. 1 Wednesday, April 21, 2004
Weekly newspaper from Rusk, Texas that includes local, state and national news along with extensive advertising.
Date:
April 21, 2004
Creator:
Whitehead, Marie
Object Type:
Newspaper
System:
The Portal to Texas History
North Texas Daily (Denton, Tex.), Vol. 88, No. 61, Ed. 1 Wednesday, January 21, 2004
Daily student newspaper from the University of North Texas in Denton, Texas that includes local, state and campus news along with advertising.
Date:
January 21, 2004
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The University News (Irving, Tex.), Vol. 33, No. 22, Ed. 1 Wednesday, April 21, 2004
Weekly student newspaper from the University of Dallas in Irving, Texas that includes campus news and commentaries along with advertising.
Date:
April 21, 2004
Creator:
Kuckelman, Meghan
Object Type:
Newspaper
System:
The Portal to Texas History
Texas Attorney General Opinion: GA-0261
Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Greg Abbott, regarding a legal question submitted for clarification; Whether Texas Code of Criminal Procedure article 43.10 authorizes a county to use county inmate labor at an event that are a joint venture between the county and nonprofit organization (RQ-0217-GA)
Date:
October 21, 2004
Creator:
Texas. Attorney-General's Office.
Object Type:
Text
System:
The Portal to Texas History
Texas Attorney General Opinion: GA-0262
Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Greg Abbott, regarding a legal question submitted for clarification; Deposit and administration of crime control and prevention district's funds under chapter 363 of the Local Government Code (RQ-0219-GA)
Date:
October 21, 2004
Creator:
Texas. Attorney-General's Office.
Object Type:
Text
System:
The Portal to Texas History
The Rambler (Fort Worth, Tex.), Vol. 91, No. 12, Ed. 1 Wednesday, April 21, 2004
Weekly student newspaper from Texas Wesleyan University in Fort Worth, Texas that includes campus and local news along with advertising.
Date:
April 21, 2004
Creator:
Nettles, Marc
Object Type:
Newspaper
System:
The Portal to Texas History
Texas Attorney General Opinion: GA-0182
Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Greg Abbott, regarding a legal question submitted for clarification: Whether the Texas Parks and Wildlife Department may convey real property or an interest in real property the State received under a court-approved final judgement “solely for the use and benefit of the … Department, acting in the public Trust … only for the public park purposes, for promoting public beach access, and for off-beach parking” (RQ-0131-GA)
Date:
April 21, 2004
Creator:
Texas. Attorney-General's Office.
Object Type:
Text
System:
The Portal to Texas History
Texas Attorney General Opinion: GA-0138
Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Greg Abbott, regarding a legal question submitted for clarification; Whether individual county commissioners are entitled to access medical insurance coverage information regarding a former commissioner and his wife (RQ-0077-GA)
Date:
January 21, 2004
Creator:
Texas. Attorney-General's Office.
Object Type:
Text
System:
The Portal to Texas History
Texas Attorney General Opinion: GA-0181
Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Greg Abbott, regarding a legal question submitted for clarification: Whether a licensed crab fisherman must obtain permission from the owner submerged land in order to place crab traps at that location (RQ-0130-GA)
Date:
April 21, 2004
Creator:
Texas. Attorney-General's Office.
Object Type:
Text
System:
The Portal to Texas History
Probability Density and CFAR Threshold Estimation for Hyperspectral Imaging
The work reported here shows the proof of principle (using a small data set) for a suite of algorithms designed to estimate the probability density function of hyperspectral background data and compute the appropriate Constant False Alarm Rate (CFAR) matched filter decision threshold for a chemical plume detector. Future work will provide a thorough demonstration of the algorithms and their performance with a large data set. The LASI (Large Aperture Search Initiative) Project involves instrumentation and image processing for hyperspectral images of chemical plumes in the atmosphere. The work reported here involves research and development on algorithms for reducing the false alarm rate in chemical plume detection and identification algorithms operating on hyperspectral image cubes. The chemical plume detection algorithms to date have used matched filters designed using generalized maximum likelihood ratio hypothesis testing algorithms [1, 2, 5, 6, 7, 12, 10, 11, 13]. One of the key challenges in hyperspectral imaging research is the high false alarm rate that often results from the plume detector [1, 2]. The overall goal of this work is to extend the classical matched filter detector to apply Constant False Alarm Rate (CFAR) methods to reduce the false alarm rate, or Probability of False …
Date:
September 21, 2004
Creator:
Clark, G A
Object Type:
Report
System:
The UNT Digital Library
Quantitative Evaluation of Bio-Aerosol Mass Spectrometry for the Real-Time Detection of Individual Airborne Mycobacterium Tuberculosis H37Ra Particles
None
Date:
May 21, 2004
Creator:
Tobias, H; Schafer, M; Pitesky, M; Horn, J & Frank, M
Object Type:
Article
System:
The UNT Digital Library
Nuclear Weapons in Russia: Safety, Security, and Control Issues
This report provides background information on the location of nuclear weapons at the time of the demise of the Soviet Union and their subsequent relocation to storage and deployment areas in Russia. It also provides a description of the safety, security, and control issues raised in 1991 and in more recent years. It includes a brief listing of the cooperative programs and assistance the United States has provided to Russia and the other former Soviet states in an effort to address concerns about the safety and security of nuclear weapons and materials.
Date:
January 21, 2004
Creator:
Woolf, Amy F.
Object Type:
Report
System:
The UNT Digital Library
Near-infrared Adaptive Optics Imaging of the Satellites and Individual Rings of Uranus from the W.M. Keck Observatory
None
Date:
January 21, 2004
Creator:
Gibbard, S G; de Pater, I & Hammel, H B
Object Type:
Article
System:
The UNT Digital Library