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Vertical cavity surface emitting laser emitting at 1.56 microns with AlGaAsSb/AlAsSb distributed Bragg reflectors

Description: The authors report 77K operation of an optically pumped vertical cavity surface emitting laser with an Sb-based cavity. The structure consists of 15 and 20 pair AlGaAsSb/AlAsSb top and bottom reflectors and a bulk InGaAs active region.
Date: July 1, 1998
Creator: Blum, O.; Klem, J. F.; Lear, K. L.; Vawter, G. A. & Kurtz, S. R.
Item Type: Refine your search to only Article
open access

Vertical coherent instabilities in bunched particle-beams

Description: The purpose of this paper is to study the vertical coherent instabilities which occur in bunched particle beams. The problem is complicated by the fact that the velocity of a single particle in a bunch is not constant, but rather consists of an equilibrium velocity and an oscillation about that. This synchrotron oscillation occurs at a frequency which is in general much less than the other characteristic frequencies of the system: the revolution frequency and the transverse betatron frequencies… more
Date: July 1, 1981
Creator: Ruth, R. D.
Item Type: Refine your search to only Report
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Vertical Distribution of Calcite at Yucca Mountain, Nevada, as an Indicator of Flow Through a Thick Unsaturated Zone

Description: Meteoric water percolating through 500 to 700 m of hydrologically unsaturated felsic tuffs provides a mechanism for release and transport of radionuclides from a potential high-level radioactive waste repository at Yucca Mountain, Nevada. Modern flow through the unsaturated zone (UZ) is low (probably <20 mm/year) and has not been observed directly. However, calcite formed from water percolating through fracture and lithophysal cavities over the last 12.8 million years provides, in part, a ti… more
Date: July 20, 2001
Creator: Paces, J. B. & Peterman, Z. E.
Item Type: Refine your search to only Report
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Vertical Drop of the Naval SNF Long Waste Package On Unyielding Surface

Description: The purpose of this calculation is to determine the structural response of a Naval SNF (Spent Nuclear Fuel) Long Waste Package (WP) subjected to 2 m-vertical drop on unyielding surface (US). The scope of this document is limited to reporting the calculation results in terms of maximum stress intensities. This calculation is associated with the waste package design; calculation is performed by the Waste Package Design group. AP-3.12Q, Revision 0, ICN 0, Calculations, is used to perform the calcu… more
Date: July 21, 2006
Creator: Mastilovic, S.
Item Type: Refine your search to only Report
open access

The Very deep hole concept: evaluation of an alternative for nuclear waste disposal

Description: One proposal for disposing of radioactive waste is to put it in drill holes or mined cavities so deep that the waste would be effectively isolated from the surface. Even if radioisotopes escaped from the disposal canister, they would be removed from the circulating groundwater system by sorption and/or chemical reaction in their transit on very long paths to the surface. This report summarizes the feasibilities and costs of making deep holes and deep mine shafts; estimates probable technologica… more
Date: July 1, 1979
Creator: O'Brien, M.T.; Cohen, L.H.; Narasimhan, T.N.; Simkin, T.L.; Wollenberg, H.A.; Brace, W.F. et al.
Item Type: Refine your search to only Report
open access

Very extended shapes in 108Cd: evidence for the occupation of 'hyper-intruder' orbitals

Description: High-spin states in {sup 108}Cd were studied following the reaction {sup 64} Ni({sup 48}Ca,4n) at a beam energy of 207 MeV. Gamma rays were detected using the Gammasphere array. Two rotational bands have been observed at very high angular momentum. Measurements of fractional Doppler shifts yielded lower limits for the quadrupole moments and showed that the observed structures are at least as deformed as the superdeformed structures e.g. in the A {approx} 150 region, and possibly exceed a 2:1 ax… more
Date: July 1, 2002
Creator: Gorgen, A.; Clark, R. M.; Fallon, P.; Cromaz, M.; Deleplanque, M. A.; Diamond, R. M. et al.
Item Type: Refine your search to only Article
open access

A VERY Informal Note on Cooling Pbars from the Main Injector

Description: For the Accelerator Upgrade (Phase I), we have chosen to upgrade the cooling in the following ways: (A) Increasing the existing 800 W system to 1600 W. (B) Adding momentum cooling (2x reduction in {Delta}p). (C) Increasing the electrode gap by {radical}(30/20). The electrode gap increase makes the yield greater at the price of reducing the cooling efficiency. The performance of the cooling system has been calculated in the approximation that the cooling process can be described by a Fokker-Plan… more
Date: July 3, 1989
Creator: Marriner, J.
Item Type: Refine your search to only Report
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A very-low-Q diffractometer for an advanced spallation source

Description: Proposals to build new, more powerful spallation sources and the introduction of advanced moderator concepts will result in neutron sources that are 20 times more luminous than the brightest available today. These developments provide opportunity and challenge to expand the capabilities of present low-Q instruments using new designs. A particularly interesting case is the design of an instrument capable of measurements to ``very low`` momentum transfer, say Q {approx} 0.0007 {Angstrom}{sup {min… more
Date: July 1, 1993
Creator: Seeger, P. A. & Hjelm, R. P.
Item Type: Refine your search to only Article
open access

Vessel support subsystem design description. Revision 1

Description: The Vessel Support Subsystem is one of three subsystems comprising the Vessel System of the Modular High Temperature Gas-Cooled Reactor 4 x 350 MW(t) Plant. The design of this subsystem has been developed by means of the Integrated Approach. This document establishes the functions and system design requirements of the Vessel Support Subsystem from the Functional Analysis, and includes institutional requirements from the Overall Plant Design Specification and the Vessel System Design Description… more
Date: July 1, 1987
Creator: Perry, R.A. & Mehta, D.D.
Item Type: Refine your search to only Report
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Veterans Affairs: Continued Action Needed to Reduce IT Equipment Losses and Correct Control Weaknesses

Description: A letter report issued by the Government Accountability Office with an abstract that begins "In July 2004, GAO reported that the six Department of Veterans Affairs (VA) medical centers it audited lacked a reliable property control database and effective inventory policies and procedures. In July 2007, GAO reported that continuing internal control weaknesses over IT equipment at four case study locations at VA resulted in an increased risk of theft, loss, and misappropriation of IT equipment ass… more
Date: July 31, 2008
Creator: United States. Government Accountability Office.
Item Type: Refine your search to only Report
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Veterans Affairs: Improved Planning Needed to Guide Development and Implementation of Education Benefits System

Description: A letter report issued by the Government Accountability Office with an abstract that begins "The Department of Veterans Affairs (VA) administers programs that provide educational resources to veterans, service members, reservists, and eligible family members of veterans. Under an initiative that the Veterans Benefits Administration (VBA) began in 1999, called The Education Expert System (TEES), VA is moving its education benefits claims processing systems to new technology platforms and replaci… more
Date: July 31, 2007
Creator: United States. Government Accountability Office.
Item Type: Refine your search to only Report
open access

Veterans Affairs: Inadequate Controls over IT Equipment at Selected VA Locations Pose Continuing Risk of Theft, Loss, and Misappropriation

Description: A letter report issued by the Government Accountability Office with an abstract that begins "In July 2004, GAO reported that the six Department of Veterans Affairs (VA) medical centers it audited lacked a reliable property control database and had problems with implementation of VA inventory policies and procedures. Fewer than half the items GAO selected for testing could be located. Most of the missing items were information technology (IT ) equipment. Given recent thefts of laptops and data b… more
Date: July 16, 2007
Creator: United States. Government Accountability Office.
Item Type: Refine your search to only Report
open access

Veterans Affairs: Lack of Accountability and Control Weaknesses over IT Equipment at Selected VA Locations

Description: Testimony issued by the Government Accountability Office with an abstract that begins "In July 2004, GAO reported that the six Department of Veterans Affairs (VA) medical centers it audited lacked a reliable property control database and had problems with implementation of VA inventory policies and procedures. Fewer than half the items GAO selected for testing could be located. Most of the missing items were information technology (IT) equipment. In light of these concerns and recent thefts of … more
Date: July 24, 2007
Creator: United States. Government Accountability Office.
Item Type: Refine your search to only Text
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Veterans Affairs: Opportunities Exist to Improve Potential Recipients' Awareness of the Temporary Residence Adaptation Grant

Description: A letter report issued by the Government Accountability Office with an abstract that begins "Adaptive housing assistance grants help eligible service members or veterans adapt or modify a residence to accommodate disabilities sustained through military service. The Veterans' Housing Opportunity and Benefits Improvement Act of 2006 authorized the Department of Veterans Affairs (VA) to expand its existing adaptive housing assistance grants to include eligible individuals temporarily living in a h… more
Date: July 15, 2010
Creator: United States. Government Accountability Office.
Item Type: Refine your search to only Report
open access

Veterans Benefits Administration: Process for Preventing Improper Payments to Deceased Veterans Can Be Improved

Description: A letter report issued by the General Accounting Office with an abstract that begins "In fiscal year 2002, the Veterans Benefits Administration (VBA) paid about $22.4 billion in disability compensation to over 2.6 million veterans and their survivors and about $3.3 billion in pension benefits to about 581,000 veterans and their survivors. To ensure that VBA makes proper payments under these programs, we reviewed the effectiveness of VBA efforts to prevent payments to deceased veterans by matchi… more
Date: July 24, 2003
Creator: United States. General Accounting Office.
Item Type: Refine your search to only Report
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Veterans' Benefits: VBA's Efforts to Implement the Veterans Claims Assistance Act Need Further Monitoring

Description: A letter report issued by the General Accounting Office with an abstract that begins "The Veterans Claims Assistance Act of 2000 was passed in response to concerns expressed by veterans, veterans service organizations, and Congress over a 1999 decision of the U.S. Court of Appeals for Veterans Claims that held that the VA did not have a duty to assist veterans in developing their claims unless they were "well-grounded." The Veterans' Benefits Administration (VBA) has taken a number of steps, in… more
Date: July 1, 2002
Creator: United States. General Accounting Office.
Item Type: Refine your search to only Report
open access

Veterans' Disability Benefits: Preliminary Findings on Claims Processing Trends and Improvement Efforts

Description: Testimony issued by the Government Accountability Office with an abstract that begins "The Senate Veterans' Affairs Committee asked GAO to present its preliminary findings on the Department of Veterans Affairs' (VA) disability claims process. This statement discusses (1) the trends in VA compensation claims and appeals, and (2) the steps VA is taking to improve disability claims processing. This testimony is based on ongoing work. GAO's findings are based largely on VA performance data and info… more
Date: July 29, 2009
Creator: United States. Government Accountability Office.
Item Type: Refine your search to only Text
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Veterans' Employment and Training Service: Strategic and Performance Plans Lack Vision and Clarity

Description: Testimony issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO discussed the Veterans' Employment and Training Service (VETS) and its planning activities under the Government Performance and Results Act of 1993, focusing on: (1) VETS' strategic plan for fiscal years (FY) 1999 through 2004; and (2) VETS' FY 2000 performance plan."
Date: July 29, 1999
Creator: United States. General Accounting Office.
Item Type: Refine your search to only Text
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