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4,851 Matching Results
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Controlled fabrication of nanowire sensors.
We present a simple top down approach based on nanoimprint lithography to create dense arrays of silicon nanowires over large areas. Metallic contacts to the nanowires and a bottom gate allow the operation of the array as a field-effect transistor with very large on/off ratios. When exposed to ammonia gas or cyclohexane solutions containing nitrobenzene or phenol, the threshold voltage of the field-effect transistor is shifted, a signature of charge transfer between the analytes and the nanowires. The threshold voltage shift is proportional to the Hammett parameter and the concentration of the nitrobenzene and phenol analytes. For the liquid analytes considered, we find binding energies of 400 meV, indicating strong physisorption. Such values of the binding energies are ideal for stable and reusable sensors.
Date:
October 1, 2007
Creator:
Leonard, Francois
Object Type:
Report
System:
The UNT Digital Library
Controlled Hydrogen Fleet and Infrastructure Analysis
This presentation by Keith Wipke at the 2007 DOE Hydrogen Program Annual Merit Review Meeting provides information about NREL's Controlled Hydrogen Fleet and Infrastructure Analysis Project.
Date:
May 17, 2007
Creator:
Wipke, K.
Object Type:
Presentation
System:
The UNT Digital Library
New advances in three-dimensional controlled-sourceelectromagnetic inversion
New techniques for improving both the computational andimaging performance of the three dimensional (3D) electromagnetic inverseproblem are presented. A non-linear conjugate gradient algorithm is theframework of the inversion scheme. Full wave equation modelling forcontrolled sources is utilized for data simulation along with anefficient gradient computation approach for the model update. Improvingthe modelling efficiency of the 3D finite difference method involves theseparation of the potentially large modelling mesh, defining the set ofmodel parameters, from the computational finite difference meshes usedfor field simulation. Grid spacings and thus overall grid sizes can bereduced and optimized according to source frequencies and source-receiveroffsets of a given input data set. Further computational efficiency isobtained by combining different levels of parallelization. While theparallel scheme allows for an arbitrarily large number of parallel tasks,the relative amount of message passing is kept constant. Imageenhancement is achieved by model parameter transformation functions,which enforce bounded conductivity parameters and thus prevent parameterovershoots. Further, a remedy for treating distorted data within theinversion process is presented. Data distortions simulated here includepositioning errors and a highly conductive overburden, hiding the desiredtarget signal. The methods are demonstrated using both synthetic andfield data.
Date:
May 19, 2007
Creator:
Commer, Michael & Newman, Gregory A.
Object Type:
Article
System:
The UNT Digital Library
Final Report: Biological and Synthetic Nanostructures Controlled at the Atomistic Level
Nanotechnology holds great promise for many application fields, ranging from the semiconductor industry to medical research and national security. Novel, nanostructured materials are the fundamental building blocks upon which all these future nanotechnologies will be based. In this Strategic Initiative (SI) we conducted a combined theoretical and experimental investigation of the modeling, synthesis, characterization, and design techniques which are required to fabricate semiconducting and metallic nanostructures with enhanced properties. We focused on developing capabilities that have broad applicability to a wide range of materials and can be applied both to nanomaterials that are currently being developed for nanotechnology applications and also to new, yet to be discovered, nanomaterials. During this 3 year SI project we have made excellent scientific progress in each of the components of this project. We have developed first-principles techniques for modeling the structural, electronic, optical, and transport properties of materials at the nanoscale. For the first time, we have simulated nanomaterials both in vacuum and in aqueous solution. These simulation capabilities harness the worldleading computational resources available at LLNL to model, at the quantum mechanical level, systems containing hundreds of atoms and thousands of electrons. Significant advances in the density functional and quantum Monte Carlo techniques …
Date:
February 21, 2007
Creator:
Williamson, A & van Buuren, T
Object Type:
Report
System:
The UNT Digital Library
Biodegradation of BTEX and Other Petroleum Hydrocarbons by Enhanced and Controlled Sulfate Reduction
High concentrations of sulfide in the groundwater at a field site near South Lovedale, OK, were inhibiting sulfate reducing bacteria (SRB) that are known to degrade contaminants including benzene, toluene, ethylbenzene, and m+p-xylenes (BTEX). Microcosms were established in the laboratory using groundwater and sediment collected from the field site and amended with various nutrient, substrate, and inhibitor treatments. All microcosms were initially amended with FeCl{sub 2} to induce FeS precipitation and, thereby, reduce sulfide concentrations. Complete removal of BTEX was observed within 39 days in treatments with various combinations of nutrient and substrate amendments. Results indicate that elevated concentration of sulfide is a limiting factor to BTEX biodegradation at this site, and that treating the groundwater with FeCl{sub 2} is an effective remedy to facilitate and enhance BTEX degradation by the indigenous SRB population. On another site in Moore, OK, studies were conducted to investigate barium in the groundwater. BTEX biodegradation by SRB is suspected to mobilize barium from its precipitants in groundwater. Data from microcosms demonstrated instantaneous precipitation of barium when sulfate was added; however, barium was detected redissolving for a short period and precipitating eventually, when active sulfate reduction was occurring and BTEX was degraded through the process. …
Date:
July 1, 2007
Creator:
Jin, Song
Object Type:
Report
System:
The UNT Digital Library
Security Classified and Controlled Information: History, Status, and Emerging Management Issues
None
Date:
March 8, 2007
Creator:
Relyea, Harold C.
Object Type:
Report
System:
The UNT Digital Library
North Korea: Terrorism List Removal?
None
Date:
April 6, 2007
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
North Korea: Terrorism List Removal?
None
Date:
December 11, 2007
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Innovative Methodology for Detection of Fracture-Controlled Sweet Spots in the Northern Appalachian Basin
None
Date:
March 31, 2007
Creator:
Jacobi, Robert
Object Type:
Report
System:
The UNT Digital Library
Innovative Methodology for Detection of Fracture-Controlled Sweet Spots in the Northern Appalachian Basin
None
Date:
March 31, 2007
Creator:
Jacobi, Robert
Object Type:
Report
System:
The UNT Digital Library
Innovative Methodology for Detection of Fractured-Controlled Sweet Spots in the Northern Appalachian Basin
None
Date:
March 31, 2007
Creator:
Jacobi, Robert
Object Type:
Report
System:
The UNT Digital Library
Innovative Methodology for Detection of Fracture-Controlled Sweet Spots in the Northern Appalachian Basin
None
Date:
March 31, 2007
Creator:
Jacobi, Robert
Object Type:
Report
System:
The UNT Digital Library
Innovative Methodology for Detection of Fracture-Controlled Sweet Spots in the Northern Appalachian Basin
None
Date:
March 31, 2007
Creator:
Jacobi, Robert
Object Type:
Report
System:
The UNT Digital Library
Innovative Methodology for Detection of Fracture-Controlled Sweet Spots in the Northern Appalachian Basin
None
Date:
March 31, 2007
Creator:
Jacobi, Robert
Object Type:
Report
System:
The UNT Digital Library
Innovative Methodology for Detection of Fracture-Controlled Sweet Spots in the Northern Appalachian Basin
None
Date:
March 31, 2007
Creator:
Jacobi, Robert
Object Type:
Report
System:
The UNT Digital Library
Innovative Methodology for Detection of Fracture-Controlled Sweet Spots in the Northern Appalachian Basin
For two consecutive years, 2004 and 2005, the largest natural gas well (in terms of gas flow/day) drilled onshore USA targeted the Ordovician Trenton/Black River (T/BR) play in the Appalachian Basin of New York State (NYS). Yet, little data were available concerning the characteristics of the play, or how to recognize and track T/BR prospects across the region. Traditional exploration techniques for entry into a hot play were of limited use here, since existing deep well logs and public domain seismic were almost non-existent. To help mitigate this problem, this research project was conceived with two objectives: (1) to demonstrate that integrative traditional and innovative techniques could be used as a cost-effective reconnaissance exploration methodology in this, and other, areas where existing data in targeted fracture-play horizons are almost non-existent, and (2) determine critical characteristics of the T/BR fields. The research region between Seneca and Cayuga lakes (in the Finger Lakes of NYS) is on strike and east of the discovery fields, and the southern boundary of the field area is about 8 km north of more recently discovered T/BR fields. Phase I, completed in 2004, consisted of integrating detailed outcrop fracture analyses with detailed soil gas analyses, lineaments, stratigraphy, …
Date:
March 31, 2007
Creator:
Jacobi, Robert; Fountain, John; Loewenstein, Stuart; DeRidder, Edward & Hart, Bruce
Object Type:
Report
System:
The UNT Digital Library
Sanctioned and Controlled Message Propagation in a Restrictive Information Environment: The Small World of Clandestine Radio Broadcasting
This dissertation seeks to identify the elements that inform the model for competing message propagation systems in a restrictive environment. It pays attention to message propagation by sanctioned and clandestine radio stations in pre- and post-independent Zimbabwe. This dissertation uses two models of message propagation in a limiting information environment: Sturges' information model of national liberation struggle and Chatman's small world information model. All the message propagation elements in the Sturges and Chatman's models are present in the broadcast texts analyzed. However, the findings of this dissertation indicate that communication in a restrictive information environment is designed such that its participants make sense of their situation, and come up with ways to solve the challenges of their small world. Also, a restrictive information environment is situational, and message propagators operating in it are subject to tactical changes at different times, accordingly altering their cognitive maps. The two models fail to address these concerns. This dissertation focused on message propagation in Zimbabwe because there is military belligerence involved in the information warfare. It therefore provides an extreme situation, which can help our understanding of more everyday instances of communication and interference of communication. Findings of this dissertation recommend the need to …
Date:
December 2007
Creator:
Wachanga, David Ndirangu
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Mexico's Drug Cartels
This report details Mexican Cartels, their ties to gangs, use of financial corruption, and their cells within the United States of America. As well as, the policies that are used to eradicate drug trafficking and violence.
Date:
October 16, 2007
Creator:
Cook, Colleen W.
Object Type:
Report
System:
The UNT Digital Library
Enhancing the Quality of Metadata: Modular Approach to Digital Resource Lifecycle Management
This Tech Talk presentation discusses digital resource management. Templates, validation, controlled vocabularies, analysis tools, graphical reports, and more are explained in this presentation.
Date:
March 16, 2007
Creator:
Alemneh, Daniel Gelaw & Phillips, Mark Edward
Object Type:
Presentation
System:
The UNT Digital Library
Novel Cleanup Agents Designed Exclusively for Oil Field Membrane Filtration Systems Low Cost Field Demonstrations of Cleanup Agents in Controlled Experimental Environments
The goal of our project is to develop innovative processes and novel cleaning agents for water treatment facilities designed to remove fouling materials and restore micro-filter and reverse osmosis (RO) membrane performance. This project is part of Texas A&M University's comprehensive study of the treatment and reuse of oilfield brine for beneficial purposes. Before waste water can be used for any beneficial purpose, it must be processed to remove contaminants, including oily wastes such as residual petroleum hydrocarbons. An effective way of removing petroleum from brines is the use of membrane filters to separate oily waste from the brine. Texas A&M and its partners have developed highly efficient membrane treatment and RO desalination for waste water including oil field produced water. We have also developed novel and new cleaning agents for membrane filters utilizing environmentally friendly materials so that the water from the treatment process will meet U.S. EPA drinking water standards. Prototype micellar cleaning agents perform better and use less clean water than alternate systems. While not yet optimized, the new system restores essentially complete membrane flux and separation efficiency after cleaning. Significantly the amount of desalinated water that is required to clean the membranes is reduced by more …
Date:
August 31, 2007
Creator:
Burnett, David & Vance, Harold
Object Type:
Report
System:
The UNT Digital Library
TECHNICAL BASIS DOCUMENT OF MARSSIM FIELD CALIBRATION FOR QUANTIFICATION OF CS-137 VOLUMETRICALLY CONTAMINATED SOILS IN THE BC CONTROLLED AREA USING 2 BY 2 SODIUM IODIDE DETECTORS
The purpose of this paper is to provide the Technical Basis and Documentation for Field Calibrations of radiation measurement equipment for use in the MARSSIM Seeping Surveys of the BC Controlled Area (BCCA). The Be Controlled Area is bounded on tt1e north by (but does not include) the BCCribs & Trenches and is bounded on the south by Army Loop Road. Parts of the BC Controlled Area are posted as a Contamination Area and the remainder is posted as a Soil Contamination Area. The area is approximately 13 square miles and divided into three zones (Zone A , Zone B. and Zone C). A map from reference 1 which shows the 3 zones is attached. The MARSSIM Scoping Surveys are intended 10 better identify the boundaries of the three zones based on the volumetric (pCi/g) contamination levels in the soil. The MARSSIM Field Calibration. reference 2. of radiation survey instrumentation will determine the Minimum Detectable Concentration (MDC) and an algorithm for converting counts to pCi/g. The instrumentation and corresponding results are not intended for occupational radiation protection decisions or for the release of property per DOE Order 5400.5.
Date:
October 26, 2007
Creator:
JL, PAPPIN
Object Type:
Report
System:
The UNT Digital Library
TECHNICAL BASIS DOCUMENT OF MARSSIM FIELD CALIBRATION FOR QUANTIFICATION OF CS-137 VOLUMETRICALLY CONTAMINTED SOILS IN THE BC CONTROLLED AREA USING A 4 BY 4 BY 16 INCH SODIUM IODIDE DETECTOR
The purpose of this paper is to provide the Technical Basis and Documentation for Field Calibrations of radiation measurement equipment for use in the MARSSIM Seeping Surveys of the BC Controlled Area (BCCA). The Be Controlled Area is bounded on tt1e north by (but does not include) the BCCribs & Trenches and is bounded on the south by Army Loop Road. Parts of the BC Controlled Area are posted as a Contamination Area and the remainder is posted as a Soil Contamination Area. The area is approximately 13 square miles and divided into three zones (Zone A , Zone B. and Zone C). A map from reference 1 which shows the 3 zones is attached. The MARSSIM Scoping Surveys are intended 10 better identify the boundaries of the three zones based on the volumetric (pCi/g) contamination levels in the soil. The MARSSIM Field Calibration. reference 2. of radiation survey instrumentation will determine the Minimum Detectable Concentration (MDC) and an algorithm for converting counts to pCi/g. The instrumentation and corresponding results are not intended for occupational radiation protection decisions or for the release of property per DOE Order 5400.5.
Date:
October 26, 2007
Creator:
JL, PAPPIN
Object Type:
Report
System:
The UNT Digital Library
Aviation Security: TSA's Change to Its Prohibited Items List Has Not Resulted in Any Reported Security Incidents, but the Impact of the Change on Screening Operations Is Inconclusive
Correspondence issued by the Government Accountability Office with an abstract that begins "The alleged August 2006 terrorist plot to detonate liquid explosives onboard multiple commercial aircraft bound for the United States from the United Kingdom has highlighted both the continued importance of securing the civil aviation system and the potential that improvised explosive devices (IED) may be smuggled onboard passenger aircraft. The Transportation Security Administration (TSA) has primary responsibility for ensuring the security of civil aviation, which includes the safety of passengers and flight crew. One measure TSA uses to protect the aviation system is prohibiting individuals from carrying items that it determines to be a threat to the aircraft and its passengers into an airport sterile area or onboard an aircraft either in their carry-on bag or on their person. To implement this measure, TSA maintains a prohibited items list that informs both the Transportation Security Officers (TSO) who conduct passenger screening and the traveling public of items that will not be allowed into an airport sterile area or onboard an aircraft. In December 2005, TSA revised its prohibited items list to allow passengers to carry: (1) metal scissors with pointed tips and a blade 4 inches or less …
Date:
April 25, 2007
Creator:
United States. Government Accountability Office.
Object Type:
Text
System:
The UNT Digital Library
80th Texas Legislature, Regular Session, Senate Bill 1879, Chapter 1391
Bill introduced by the Texas Senate relating to the regulation of controlled substances; providing an administrative penalty.
Date:
June 15, 2007
Creator:
Texas. Legislature. Senate.
Object Type:
Legislative Document
System:
The Portal to Texas History