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1,380 Matching Results
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FY2004 Consolidated Appropriations Act: Reference Guide
None
Date:
August 10, 2004
Creator:
Keith, Robert
Object Type:
Report
System:
The UNT Digital Library
Implementation of a Comprehensive On-Line Closed-Loop Diagnostic System for Roll-to-Roll Amorphous Silicon Solar Cell Production: Phase I Annual Report, 23 April 2003--31 August 2003
This subcontract report describes how Energy Conversion Devices, Inc., has developed and built 7 generations of roll-to-roll amorphous silicon PV production equipment. In the ECD/United Solar production process, we deposit about a 1-mm-thick, 12-layer coating consisting of a metal/oxide backreflector, a 9-layer a-Si/a-SiGe alloy triple-junction solar cell, and top transparent conductive oxide coating onto 125-mm-thick, 35.5-cm-wide stainless-steel webs in a series of three roll-to-roll deposition machines. In the PV Manufacturing R&D 6 program, ECD is building upon these accomplishments to enhance the operation of the present production machine, and lay the foundation for improvements in the next-generation machine. ECD has completed the Phase I work for the first two Tasks, and will complete the Phase I work for the second two tasks within the next two months. In the following report, we summarize the Phase I work in each of these tasks. We have involved United Solar production personnel in each of these Tasks. This is important for two reasons: First, the collaboration of ECD and United Solar personnel keeps the projects responsive to the developing needs at United Solar; and most of the tasks affect operations and consequently need the support of United Solar production and QA/QC managers. In …
Date:
August 1, 2004
Creator:
Ellison, T.
Object Type:
Report
System:
The UNT Digital Library
Chlorine Free Technology for Solar-Grade Silicon Manufacturing: Preprint
Due to the development of the solar energy industry, a significant increase of polysilicon feedstock (PSF) production will be required in near future. The creation of special technology of solar grade polysilicon feedstock production is an important problem. Today, semiconductor-grade polysilicon is mainly manufactured using the trichlorosilane (SiHCl3) distillation and reduction. The feed-stock for trichlorosilane is metallurgical-grade silicon, the product of reduction of natural quartzite (silica). This polysilicon production method is characterized by high energy consumption and large amounts of wastes, containing environmentally harmful chlorine based compounds. In the former USSR the principles of industrial method for production of monosilane and polycrystalline silicon by thermal decomposition of monosilane were founded. This technology was proved in industrial scale at production of gaseous monosilane and PSF. We offered new chlorine free technology (CFT). Originality and novelty of the process were confirmed by Russian and US patents.
Date:
August 1, 2004
Creator:
Strebkov, D. S.; Pinov, A. P.; Zadde, V. V.; Lebedev, E. N.; Belov, E. P.; Efimov, N. K. et al.
Object Type:
Article
System:
The UNT Digital Library
Social Security Reform
None
Date:
August 16, 2004
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Intermodal Rail Freight: A Role for Federal Funding?
This report provides historical context and reviews some of the factors inspiring debate related to funding for rail freight.
Date:
August 18, 2004
Creator:
Frittelli, John F.
Object Type:
Report
System:
The UNT Digital Library
Project BioShield
None
Date:
August 3, 2004
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Fabrication of a Carbon Nanotube-Embedded Silicon Nitride Membrane for Studies of Nanometer-Scale Mass Transport
A membrane consisting of multiwall carbon nanotubes embedded in a silicon nitride matrix was fabricated for fluid mechanics studies on the nanometer scale. Characterization by tracer diffusion and scanning electron microscopy suggests that the membrane is free of large voids. An upper limit to the diffusive flux of D{sub 2}O of 2.4x10-{sup 8} mole/m{sup 2}-s was determined, indicating extremely slow transport. By contrast, hydrodynamic calculations of water flow across a nanotube membrane of similar specifications predict a much higher molar flux of 1.91 mole/m{sup 2}-s, suggesting that the nanotubes produced possess a 'bamboo' morphology. The carbon nanotube membranes were used to make nanoporous silicon nitride membranes, fabricated by sacrificial removal of the carbon. Nitrogen flow measurements on these structures give a membrane permeance of 4.7x10{sup -4} mole/m{sup 2}-s-Pa at a pore density of 4x10{sup 10} cm{sup -2}. Using a Knudsen diffusion model, the average pore size of this membrane is estimated to be 66 nm, which agrees well with TEM observations of the multiwall carbon nanotube outer diameter. These membranes are a robust platform for the study of confined molecular transport, with applications inseparations and chemical sensing.
Date:
August 25, 2004
Creator:
Holt, J K; Noy, A; Huser, T; Eaglesham, D & Bakajin, O
Object Type:
Article
System:
The UNT Digital Library
Proposal for Reduction of Transverse Emittance of Bnl 200 Mev Linac.
BNL has a plan to upgrade the AGS proton beam from the current 0.14 MW to higher than 1.0 MW and beyond for a neutrino facility which consists of two major subsystems. First is a 1.45 GeV superconducting linac (SCL) to replace the Booster as injector for the AGS. Second is the performance upgrade for the AGS itself for the higher intensity and repetition rate. For high intensity proton accelerators, such as the upgraded AGS, there are very stringent limitations on uncontrolled beam losses. A direct effect of increased linac beam emittance is the halohail generation in the circulating beam. Studies show the estimated halohail generation in the beam for the present normalized RMS emittance of the linac beam is unacceptable. To reduce the transverse emittance of the 200 MeV linac, the existing radio frequency quadrupole linac (RFQ) has to be relocated closer to drift tube linac (DTL) tank 1 to meet the emittance requirement for AGS injection with low loss. This paper will present the various options of matching between RFQ and DTL, and chopping options in the low energy beam transport (LEBT).
Date:
August 13, 2004
Creator:
Raparia, D.; Alessij.; Beebe-Wang, J. & Weng, W. T.
Object Type:
Article
System:
The UNT Digital Library
Modelling and Experimental Studies of the Effect of Water at the Polymer-Filler Interface in Silica-Filled Siloxane Rubbers
Silica-filled polydimethylsiloxane (PDMS) composite systems find a broad range of applications due to their chemical and environmental resilience and the ability to fine tune, through chemical and processing modifications, the chemical and mechanical properties resulting in a precise engineering property for the final component. Thus, requirements for, and life-performance predictions of, these materials require an understanding of the interaction between the silica filler and the polymer network. Because silica surfaces are well known to have a high affinity for water adsorption, and this water is a critical part of the interface between the silica particles and the polymer matrix, water at this interface has important consequences on the nature of the silica-polymer bonding and subsequently the mechanical behaviour. Previous studies have reported on the water speciation and long-term outgassing kinetics of common fumed and precipitated silicas used in silicone elastomers, and of one such copolymer system in particular. Several different water species were observed to be present with a range of desorption activation energies. The amount and type of species present were observed to be dependent on the thermal and chemical history of the filler and the composite. Solid state Nuclear Magnetic Resonance (NMR) methods based on quantification of residual …
Date:
August 23, 2004
Creator:
Dinh, L N; Schildbach, M A; Balazs, G B; Gee, R & Maxwell, R S
Object Type:
Article
System:
The UNT Digital Library
Preparing Successful ISTC Proposals for Radiological Monitoring Projects
The United States Science Centers Program exists because expertise relevant to the production or use of weapons of mass destruction (WMD) exists in the states formerly comprising the Soviet Union. We seek to deter the transfer of that knowledge to people or governments that would use it to do harm or terrorize. Working through the Science & Technology Centers in Moscow and Kyiv, we promote peaceful collaborative science as an alternative to the proliferation of WMD expertise. In concert, we believe that increasing the prosperity of scientists helps reduce the potential attraction of working for rogue states and groups. Therefore, we aim to help scientific groups become successful at developing stable sources of income. Towards that end, we hope to guide former WMD scientists in the successful preparation of not only research proposals to the Science Centers, but future proposals seeking other funding sources as they join the competitive global scientific community.
Date:
August 12, 2004
Creator:
Surano, K; Scheland, M & Witow, J
Object Type:
Article
System:
The UNT Digital Library
Present and Future Surface Climate in the Western U.S. as Simulated by 15 Global Climate Models
We analyze results of 15 global climate simulations contributed to the Coupled Model Intercomparison Project (CMIP). Focusing on the western U.S., we consider both present climate simulations and predicted responses to increasing atmospheric CO{sub 2}. The models vary in their ability to predict the present climate. Over the western U.S., a few models produce a seasonal cycle for spatially-averaged temperature and/or precipitation in good agreement with observational data. Other models tend to overpredict precipitation in the winter or exaggerate the amplitude of the seasonal cycle of temperature. The models also differ in their ability to reproduce the spatial patterns of temperature and precipitation in the U.S. Considering the monthly mean precipitation responses to doubled atmospheric CO{sub 2}, averaged over the western U.S., we find some models predict increases while others predict decreases. The predicted temperature response, on the other hand, is invariably positive over this region; however, for each month, the range of values given by the different models is large compared to the mean model response. We look for possible relationships between the models' temperature and precipitation responses to doubled CO{sub 2} concentration and their ability to simulate some aspects of the present climate. We find that these relationships …
Date:
August 9, 2004
Creator:
Coquard, J; Duffy, P B; Taylor, K E & Iorio, J P
Object Type:
Article
System:
The UNT Digital Library
The Law of the Sea Convention and U.S. Policy
This report includes information regarding the Law of the Sea Convention. The convention and U.S. interests, Part XI, and the 1994 Agreement are among topics discussed in this report.
Date:
August 19, 2004
Creator:
Browne, Marjorie Ann
Object Type:
Report
System:
The UNT Digital Library
Adaptive compensation of atmospheric turbulence utilizing an interferometric wave-front sensor and a high-resolution MEMS-based spatial light modulator
Horizontal path correction of optical beam propagation presents a severe challenge to adaptive optics systems due to the short transverse coherence length and the high degree of scintillation incurred by propagation along these paths. The system presented operates with nearly monochromatic light. It does not require a global reconstruction of the phase, thereby eliminating issues with branch points and making its performance relatively unaffected by scintillation. The systems pixel count, 1024, and relatively high correction speed, in excess of 800 Hz, enable its use for correction of horizontal path beam propagation. We present results from laboratory and field tests of the system in which we have achieved Strehl ratios greater than 0.5.
Date:
August 12, 2004
Creator:
Baker, K.; Stappaerts, E.; Gavel, D.; Tucker, J.; Silva, D.; Wilks, S. et al.
Object Type:
Article
System:
The UNT Digital Library
Pulse duration measurements of a picosecond laser-pumped 14.7 nm x-ray laser
The temporal dependence of the 14.7 nm Ni-like Pd ion x-ray laser is measured as a function of the laser drive conditions with a fast sub-picosecond x-ray streak camera. The chirped pulse amplification laser beam that pumps the inversion process is varied from 0.5 - 27 ps (FWHM) to determine the effect on the x-ray laser pulse duration. The average x-ray laser pulse duration varies by a relatively small factor of 2.5 times from 3.6 ps to 8.1 ps with traveling wave (TW) irradiation conditions. Slightly shorter pulse durations approaching 2 ps are observed with the x-ray laser operating below saturation. The x-ray laser is found to be 4 - 5 times transform-limited for 6 - 13 ps laser pumping conditions.
Date:
August 3, 2004
Creator:
Dunn, J; Smith, R F; Shepherd, R; Booth, R; Nilsen, J; Hunter, J R et al.
Object Type:
Article
System:
The UNT Digital Library
3rd order resonance at RHIC injection
N/A
Date:
August 1, 2004
Creator:
R., Toms
Object Type:
Report
System:
The UNT Digital Library
Principle of Global Decoupling on the Ramp
N/A
Date:
August 1, 2004
Creator:
Y., Luo; Pilat, F.; Trbojevic, D.; Roser, T. & Wei, J.
Object Type:
Report
System:
The UNT Digital Library
Effects of Altered Temperature & Precipitation on Soil Bacterial & Microfaunal Communities as Mediated by Biological Soil Crusts
With increased temperatures in our original pot study we observed a decline in lichen/moss crust cover and with that a decline in carbon and nitrogen fixation, and thus a probable decline of C and N input into crusts and soils. Soil bacteria and fauna were affected negatively by increased temperature in both light and dark crusts, and with movement from cool to hot and hot to hotter desert climates. Crust microbial biomass and relative abundance of diazotrophs was reduced greatly after one year, even in pots that were not moved from their original location, although no change in diazotroph community structure was observed. Populations of soil fauna moved from cool to hot deserts were affected more negatively than those moved from hot to hotter deserts.
Date:
August 31, 2004
Creator:
Neher, Deborah A.
Object Type:
Text
System:
The UNT Digital Library
Closure Report for Corrective Action Unit 271: Areas 25, 26, and 27 Septic Systems, Nevada Test Site, Nevada with Errata Sheet, Revision 0
The purpose of this CR is to document that closure activities have met the approved closure standards detailed in the NDEP-approved CAP for CAU 271. The purpose of the Errata Sheet is as follows: In Appendix G, Use Restriction (UR) Documentation, the UR form and drawing of the UR area do not reflect the correct coordinates. Since the original UR was put into place, the UR Form has been updated to include additional information that was not on the original form. This Errata Sheet replaces the original UR Form and drawing. In place of the drawing of the UR area, an aerial photograph is included which reflects the UR area and the correct coordinates for the UR area.
Date:
August 1, 2004
Creator:
Krauss, Mark
Object Type:
Report
System:
The UNT Digital Library
[Letter from Becky Levy to Campaign Treasurers of General-Purpose Committees]
Letter from Becky Levy to Campaign Treasurers of General-Purpose Committees on August 30, 2004, regarding filing deadlines for 2004 general election listing pre-election reports, electronic filing requirement for pre-election reports, changes in campaign finance law, telegram reports, timely filing, late-filing penalties, and questions. Included is a guideline to changes in campaign finance law.
Date:
August 30, 2004
Creator:
unknown
Object Type:
Letter
System:
The UNT Digital Library
A Test of a Strong Ground Motion Prediction Methodology for the 7 September 1999, Mw=6.0 Athens Earthquake
We test a methodology to predict the range of ground-motion hazard for a fixed magnitude earthquake along a specific fault or within a specific source volume, and we demonstrate how to incorporate this into probabilistic seismic hazard analyses (PSHA). We modeled ground motion with empirical Green's functions. We tested our methodology with the 7 September 1999, Mw=6.0 Athens earthquake, we: (1) developed constraints on rupture parameters based on prior knowledge of earthquake rupture processes and sources in the region; (2) generated impulsive point shear source empirical Green's functions by deconvolving out the source contribution of M < 4.0 aftershocks; (3) used aftershocks that occurred throughout the area and not necessarily along the fault to be modeled; (4) ran a sufficient number of scenario earthquakes to span the full variability of ground motion possible; (5) found that our distribution of synthesized ground motions span what actually occurred and their distribution is realistically narrow; (6) determined that one of our source models generates records that match observed time histories well; (7) found that certain combinations of rupture parameters produced ''extreme'' ground motions at some stations; (8) identified that the ''best fitting'' rupture models occurred in the vicinity of 38.05{sup o} N 23.60{sup …
Date:
August 6, 2004
Creator:
Hutchings, Lawrence; Ioannidou, Eleni; Voulgaris, Nicholas; Kalogeras, Ioannis; Savy, Jean; Foxall, William et al.
Object Type:
Article
System:
The UNT Digital Library
The Albany News (Albany, Tex.), Vol. 129, No. 11, Ed. 1 Thursday, August 12, 2004
Weekly newspaper from Albany, Texas that includes local, county, and state news along with extensive advertising.
Date:
August 12, 2004
Creator:
Lucas, Melinda L.
Object Type:
Newspaper
System:
The Portal to Texas History
The Albany News (Albany, Tex.), Vol. 129, No. 10, Ed. 1 Thursday, August 5, 2004
Weekly newspaper from Albany, Texas that includes local, county, and state news along with extensive advertising.
Date:
August 5, 2004
Creator:
Lucas, Melinda L.
Object Type:
Newspaper
System:
The Portal to Texas History
The Albany News (Albany, Tex.), Vol. 129, No. 13, Ed. 1 Thursday, August 26, 2004
Weekly newspaper from Albany, Texas that includes local, county, and state news along with extensive advertising.
Date:
August 26, 2004
Creator:
Lucas, Melinda L.
Object Type:
Newspaper
System:
The Portal to Texas History
Salinas primer.
Salinas provides a massively parallel implementation of structural dynamics finite element analysis. This capability is required for high fidelity, validated models used in modal, vibration, static and shock analysis of weapons systems. General capabilities for modal, statics and transient dynamics are provided. Salinas is similar to commercial codes like Nastran or Abaqus. It has some nonlinear capability, but excels in linear computation. It is different than the above commercial codes in that it is designed to operate efficiently in a massively parallel environment. Even for an experienced analyst, running a new finite element package can be a challenge. This little primer is intended to make part of this task easier by presenting the basic steps in a simple way. The analyst is referred to the theory manual for details of the mathematics behind the work. The User's Notes should be used for more complex inputs, and will have more details about the process (as well as many more examples). More information can be found on our web pages, 3 or 4. Finite element analysis can be deceptive. Any software can give the wrong answers if used improperly, and occasionally even when used properly. Certainly a solid background in structural mechanics …
Date:
August 1, 2004
Creator:
Walsh, Timothy Francis; Reese, Garth M. & Bhardwaj, Manoj Kumar
Object Type:
Report
System:
The UNT Digital Library