338 Matching Results

Search Results

Results: 1 - 24 next
open access

17.5% p-Type Silicon Heterojunction Solar Cells with HWCVD a-Si:H as the Emitter and Back Contact

Description: Thin hydrogenated amorphous silicon (a-Si:H) layers deposited by hot-wire chemical vapor deposition (HWCVD) are used as both emitters and back contacts in silicon heterojunction solar cells. Low interface recombination velocity and high open-circuit voltage are achieved by a low substrate temperature (<150 deg C) intrinsic a-Si:H deposition which ensures immediate amorphous silicon deposition. This is followed by deposition of doped a-Si:H at a higher temperature (>200 deg C) which appears to i… more
Date: November 1, 2005
Creator: Wang, T. H.; Page, M. R.; Iwaniczko, E.; Wang, Q.; Xu,Y.; Yan, Y. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

100/300 Area Aquifer Tube Task: Annual Sampling for Fiscal Year 2006, Hanford Site, Washington

Description: This letter report has been prepared to provide the U.S. Department of Energy, U.S. Environmental Protection Agency, Washington State Department of Ecology, and Hanford Site contractors with logistical information pertaining to the use of certain environmental monitoring sites. Although the distribution is not limited, It is not intended for general distribution beyond that audience.
Date: November 1, 2005
Creator: Peterson, Robert E.; Hartman, Mary J.; Raidl, Robert F. & Borghese, Jane V.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

15th Workshop on Crystalline Silicon Solar Cells and Modules: Materials and Processes; Extended Abstracts and Papers

Description: The National Center for Photovoltaics sponsored the 15th Workshop on Crystalline Silicon Solar Cells & Modules: Materials and Processes, held in Vail, CO, August 7-10, 2005. This meeting provided a forum for an informal exchange of technical and scientific information between international researchers in the photovoltaic and relevant non-photovoltaic fields. The workshop addressed the fundamental properties of PV silicon, new solar cell designs, and advanced solar cell processing techniques. A … more
Date: November 1, 2005
Creator: Sopori, B. L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

2004 Physics and Advanced Technologies In the News

Description: Several outstanding research activities in the Physics and Advanced Technology Directorate in 2004 were featured in ''Science & Technology Review'', the monthly publication of the Lawrence Livermore National Laboratory. Reprints of those articles accompany this report. Here we summarize other science and technology highlights, as well as the awards and recognition received by members of the Directorate in 2004.
Date: November 1, 2005
Creator: Hazi, Andrew
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

3D Active photonic crystal devices for integrated photonics and silicon photonics.

Description: Over the past 15 years, basic photonic crystals operating in optical wavelengths have been theoretically investigated and experimentally realized. New directions must now be set to understand fundamental photon-matter interactions and thus realize active photonic components for integrated and silicon-based photonic applications. This proposal aims at two key areas to study. They are: (1) Thermal emission and silicon photonic crystal lasers--an aspect of photon-phonon interaction. (2) Optical in… more
Date: November 1, 2005
Creator: Clem, Paul Gilbert; Chow, Weng Wah; Subramania,Ganapathi Subramanian; Fleming, James Grant; Wendt, Joel Robert & El-Kady, Ihab Fathy
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Achievement of Low Emissions by Engine Modification to Utilize Gas-to-Liquid Fuel and Advanced Emission Controls on a Class 8 Truck

Description: A 2002 Cummins ISM engine was modified to be optimized for operation on gas-to-liquid (GTL) fuel and advanced emission control devices. The engine modifications included increased exhaust gas recirculation (EGR), decreased compression ratio, and reshaped piston and bowl configuration.
Date: November 1, 2005
Creator: Alleman, T. L.; Tennant, C. J.; Hayes, R. R.; Miyasato, M.; Oshinuga, A.; Barton, G. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Adaptive optical zoom sensor.

Description: In order to optically vary the magnification of an imaging system, continuous mechanical zoom lenses require multiple optical elements and use fine mechanical motion to precisely adjust the separations between individual or groups of lenses. By incorporating active elements into the optical design, we have designed and demonstrated imaging systems that are capable of variable optical magnification with no macroscopic moving parts. Changing the effective focal length and magnification of an imag… more
Date: November 1, 2005
Creator: Sweatt, William C.; Bagwell, Brett E. & Wick, David Victor
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Adhesive Joint and Composites Modeling in SIERRA

Description: Polymers and fiber-reinforced polymer matrix composites play an important role in many Defense Program applications. Recently an advanced nonlinear viscoelastic model for polymers has been developed and incorporated into ADAGIO, Sandia's SIERRA-based quasi-static analysis code. Standard linear elastic shell and continuum models for fiber-reinforced polymer-matrix composites have also been added to ADAGIO. This report details the use of these models for advanced adhesive joint and composites sim… more
Date: November 1, 2005
Creator: Ohashi, Yuki; Brown, Arthur A.; Hammerand, Daniel Carl; Adolf, Douglas Brian; Chambers, Robert S. & Foulk, James W., III
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Advanced Intermediate Heat Transport Loop Design Configurations for Hydrogen Production Using High Temperature Nuclear Reactors

Description: The US Department of Energy is investigating the use of high-temperature nuclear reactors to produce hydrogen using either thermochemical cycles or high-temperature electrolysis. Although the hydrogen production processes are in an early stage of development, coupling either of these processes to the high-temperature reactor requires both efficient heat transfer and adequate separation of the facilities to assure that off-normal events in the production facility do not impact the nuclear power … more
Date: November 1, 2005
Creator: Oh, Chang; Davis, Cliff; Barner, Rober & Pickard, Paul
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Advances in CdTe R&D at NREL

Description: This paper summarizes the following R&D accomplishments at National Renewable Energy Laboratory (NREL): (1) Developed several novel materials and world-record high-efficiency CdTe solar cell, (2) Developed "one heat-up step" manufacturing processes, and (3) Demonstrated 13.9% transparent CdTe cell and 15.3% CdTe/CIS polycrystalline tandem solar cell. Cadmium telluride has been well recognized as a promising photovoltaic material for thin-film solar cells because of its near-optimum bandgap of ~… more
Date: November 1, 2005
Creator: Wu, X.; Zhou, J.; Keane, J. C.; Dhere, R. G.; Albin, D. S.; Gessert, T. A. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Advances in radiation modeling in ALEGRA :a final report for LDRD-67120, efficient implicit mulitgroup radiation calculations.

Description: The original LDRD proposal was to use a nonlinear diffusion solver to compute estimates for the material temperature that could then be used in a Implicit Monte Carlo (IMC) calculation. At the end of the first year of the project, it was determined that this was not going to be effective, partially due to the concept, and partially due to the fact that the radiation diffusion package was not as efficient as it could be. The second, and final year, of the project focused on improving the robustn… more
Date: November 1, 2005
Creator: Mehlhorn, Thomas Alan; Kurecka, Christopher J. (University of Michigan, Ann Arbor, MI); McClarren, Ryan (University of Michigan, Ann Arbor, MI); Brunner, Thomas A. & Holloway, James Paul (University of Michigan, Ann Arbor, MI)
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Agriculture and FY2006 Budget Reconciliation

Description: The FY2006 budget resolution (H.Con.Res. 95, H.Rept. 109-62) contains reconciliation instructions that require authorizing committees to report legislation to reduce spending on mandatory programs within each committee’s jurisdiction. The resolution instructed the House and Senate Agriculture Committees to report legislation reducing spending on USDA mandatory programs by $173 million in FY2006 and $3.0 billion over five years (FY2006-FY2010). The House and Senate Agriculture Committees have co… more
Date: November 1, 2005
Creator: Chite, Ralph M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department

An Alternative Approach to Interoperability Testing

Description: Presentation for the 2005 American Society for Information Science and Technology (ASIS&T) Annual Meeting. This presentation discusses an alternative approach to interoperability testing and the use of special diagnostic records in the context of Z39.50 and online library catalogs.
Date: November 1, 2005
Creator: Moen, William E. & Yoon, JungWon
Item Type: Refine your search to only Presentation
Partner: UNT College of Information
open access

Amchitka Island Environmental Analysis Phase 4 Actinide Analysis At Idaho National laboratory

Description: Idaho National Laboratory (INL) provided support to Vanderbilt University and Consortium for Risk Evaluation with Stakeholder Participation (CRESP) in their activites, supported by the Department of Energy (DOE), to assess the impact of past nuclear testing at Amchitka Island on the ecosystem of the island and surrounding ocean. INL participated in this project in four phases. INL support in the first three phases is documented in Report # INL/EXT-05-00361. The details of INL participation in P… more
Date: November 1, 2005
Creator: Elias, Gracy
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Application of Mass Lumped Higher Order Finite Elements

Description: There are many interesting phenomena in extended-MHD such as anisotropic transport, mhd, 2-fluid effects stellarator and hot particles. Any one of them challenges numerical analysts, and researchers are seeking for higher order methods, such as higher order finite difference, higher order finite elements and hp/spectral elements. It is true that these methods give more accurate solution than their linear counterparts. However, numerically they are prohibitively expensive. Here we give a success… more
Date: November 1, 2005
Creator: J. Chen, H.R. Strauss, S.C. Jardin, W. Park, L.E. Sugiyama, G. Fu, J. Breslau
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Architectural Advancements in RELAP5-3D

Description: As both the computer industry and field of nuclear science and engineering move forward, there is a need to improve the computing tools used in the nuclear industry to keep pace with these changes. By increasing the capability of the codes, the growing modeling needs of nuclear plant analysis will be met and advantage can be taken of more powerful computer languages and architecture. In the past eighteen months, improvements have been made to RELAP5-3D [1] for these reasons. These architectural… more
Date: November 1, 2005
Creator: Mesina, Dr. George L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Arctic National Wildlife Refuge (ANWR): Controversies for the 109th Congress

Description: This report discusses the ongoing debate about whether or not to approve energy development in the Arctic National Wildlife Refuge (ANWR). Current law forbids energy leasing in the Refuge. This report addresses several legislative options on the issue, as well as policymakers' arguments for and against development, especially in the wake of increasing terrorism since 2000-2001.
Date: November 1, 2005
Creator: Corn, M. Lynne; Gelb, Bernard A. & Baldwin, Pamela
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Assembling semiconductor nanocomposites using DNA replication technologies.

Description: Deoxyribonucleic acid (DNA) molecules represent Nature's genetic database, encoding the information necessary for all cellular processes. From a materials engineering perspective, DNA represents a nanoscale scaffold with highly refined structure, stability across a wide range of environmental conditions, and the ability to interact with a range of biomolecules. The ability to mass-manufacture functionalized DNA strands with Angstrom-level resolution through DNA replication technology, however, … more
Date: November 1, 2005
Creator: Heimer, Brandon W.; Crown, Kevin K. & Bachand, George David
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Assembly and actuation of nanomaterials using active biomolecules.

Description: The formation and functions of living materials and organisms are fundamentally different from those of synthetic materials and devices. Synthetic materials tend to have static structures, and are not capable of adapting to the functional needs of changing environments. In contrast, living systems utilize energy to create, heal, reconfigure, and dismantle materials in a dynamic, non-equilibrium fashion. The overall goal of the project was to organize and reconfigure functional assemblies of nan… more
Date: November 1, 2005
Creator: Spoerke, Erik David; Thayer, Gayle Echo; de Boer, Maarten Pieter; Bunker, Bruce Conrad; Liu, Jun; Corwin, Alex David et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Atmospheric propagation of THz radiation.

Description: In this investigation, we conduct a literature study of the best experimental and theoretical data available for thin and thick atmospheres on THz radiation propagation from 0.1 to 10 THz. We determined that for thick atmospheres no data exists beyond 450 GHz. For thin atmospheres data exists from 0.35 to 1.2 THz. We were successful in using FASE code with the HITRAN database to simulate the THz transmission spectrum for Mauna Kea from 0.1 to 2 THz. Lastly, we successfully measured the THz tran… more
Date: November 1, 2005
Creator: Wanke, Michael Clement; Mangan, Michael A. & Foltynowicz, Robert J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Atomic Structure and Electronic Properties of c-Si/a-Si:H Interfaces in Si Heterojunction Solar Cells

Description: The atomic structure and electronic properties of crystalline silicon/hydrogenated amorphous silicon (c-Si/a-Si:H) interfaces in silicon heterojunction (SHJ) solar cells are investigated by high-resolution transmission electron microscopy, atomic-resolution Z-contrast imaging, and electron energy loss spectroscopy. We find that all high-performance SHJ solar cells exhibit atomically abrupt and flat c-Si/a-Si:H interfaces and high disorder of the a-Si:H layers. These atomically abrupt and flat c… more
Date: November 1, 2005
Creator: Yan, Y.; Page, M.; Wang, Q.; Branz, H. M.; Wang, T. H. & Al-Jassim, M. M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
Back to Top of Screen