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500 Matching Results
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481 - 500 of
500
Immigration Application Fees: Current Fees Are Not Sufficient to Fund U.S. Citizenship and Immigration Services' Operations
Correspondence issued by the General Accounting Office with an abstract that begins "The Homeland Security Act of 2002 (HSA) established the Bureau of Citizenship and Immigration Services (CIS) within the Department of Homeland Security (DHS). CIS is responsible for several functions transferred from the former Immigration Services Division of the Immigration and Naturalization Service (INS) under the Department of Justice. CIS's functions include adjudicating and processing applications for U.S. citizenship and naturalization, administering work authorizations and other petitions, and providing services for new residents and citizens. CIS collects fees from applicants to process the various immigrationrelated applications and petitions. CIS also receives appropriated funds to pay for administrative and overhead costs such as records management and backlog reduction. HSA requires that we report on whether CIS is likely to derive sufficient funds from fees to carry out its functions in the absence of appropriated funds."
Date:
January 5, 2004
Creator:
United States. General Accounting Office.
Object Type:
Text
System:
The UNT Digital Library
Introduction to the National Ignition Facility
The National Ignition Facility (NIF) at the Lawrence Livermore National Laboratory is a stadium-sized facility containing a 192-beam, 1.8-Megajoule, 500-Terawatt, ultraviolet laser system together with a 10-meter diameter target chamber with room for nearly 100 experimental diagnostics. NIF will be the world's largest and most energetic laser experimental system, providing a scientific center to study inertial confinement fusion and matter at extreme energy densities and pressures. NIF's energetic laser beams will compress fusion targets to conditions required for thermonuclear bum, liberating more energy than required to initiate the fusion reactions. Other NIF experiments will study physical processes at temperatures approaching 10{sup 8} K and 10{sup 11} bar, conditions that exist naturally only in the interior of stars, planets and in nuclear weapons. NIF has completed the first phases of its laser commissioning program. The first four beams of NIF have generated 106 kilojoules of infrared light and over 16 kJ at the third harmonic (351 nm). NIF's target experimental systems are being commissioned and experiments have begun. This paper provides a detailed look the NIF laser systems, laser and optical performance and results from recent laser commissioning shots, and plans for commissioning diagnostics for experiments on NIF.
Date:
January 5, 2004
Creator:
Moses, E I
Object Type:
Article
System:
The UNT Digital Library
Largest Mergers and Acquisitions by Corporations: 2003
None
Date:
January 5, 2004
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Length-Limited Variable-to-Variable Length Codes for High-Performance Entropy Coding
Arithmetic coding achieves a superior coding rate when encoding a binary source, but its lack of speed makes it an inferior choice when true high-performance encoding is needed. We present our work on a practical implementation of fast entropy coders for binary messages utilizing only bit shifts and table lookups. To limit code table size we limit our code lengths with a type of variable-to-variable (VV) length code created from source string merging. We refer to these codes as ''merged codes''. With merged codes it is possible to achieve a desired level of speed by adjusting the number of bits read from the source at each step. The most efficient merged codes yield a coder with a worst-case inefficiency of 0.4%, relative to the Shannon entropy. Using a hybrid Golomb-VV Bin Coder we are able to achieve a compression ratio that is competitive with other state-of-the-art coders, at a superior throughput.
Date:
January 5, 2004
Creator:
Duchaineau, Mark; Senecal, Joshua & Joy, Kenneth I.
Object Type:
Article
System:
The UNT Digital Library
Magnetorheological Finishing for Imprinting Continuous Phase Plate Structure onto Optical Surfaces
Magnetorheological finishing (MRF) techniques have been developed to manufacture continuous phase plates (CPP's) and custom phase corrective structures on polished fused silica surfaces. These phase structures are important for laser applications requiring precise manipulation and control of beam-shape, energy distribution, and wavefront profile. The MRF's unique deterministic-sub-aperture polishing characteristics make it possible to imprint complex topographical information onto optical surfaces at spatial scale-lengths approaching 1 mm. In this study, we present the results of experiments and model calculations that explore imprinting two-dimensional sinusoidal structures. Results show how the MRF removal function impacts and limits imprint fidelity and what must be done to arrive at a high quality surface. We also present several examples of this imprinting technology for fabrication of phase correction plates and CPPs for use at high fluences.
Date:
January 5, 2004
Creator:
Menapace, J A; Dixit, S N; Genin, F Y & Brocious, W F
Object Type:
Article
System:
The UNT Digital Library
Military Retirement: Major Legislative Issues
This report includes information regarding the major legislative issues concerning military retirement. TERA, survivor benefit COLAs, and retirement budgeting are among topics discussed in this report.
Date:
January 5, 2004
Creator:
Goldich, Robert L.
Object Type:
Report
System:
The UNT Digital Library
The National Ignition Facility: Laser System, Beam Line Design and Construction
The construction of the National Ignition Facility (NIF) building and laser beampaths at the Lawrence Livermore National Laboratory has been completed. This 8-year design/construction effort has successfully erected a 450,000 sq ft building and filled its interior with a complex of large-scale optical benches. These benches support all of the large-aperture optic elements of the NIF and the environmentally controlled enclosures that protect each of the 192 laser beamlines as they propagate from the injection laser system, through large aperture amplification stages, and into the target chamber. Even though this facility is very large, nearly 200 m long, 100 m wide, and 30 m tall, stringent mechanical performance requirements have been achieved throughout including temperature control <0.3 C, laser-beam pointing stability on target < 50 {micro}rms, and level 100 surface cleanliness on internal components. This presentation will provide an historical perspective explaining the basis of the design, technical details describing the techniques of construction and a chronological progression of the construction activities from ground breaking to beampath completion.
Date:
January 5, 2004
Creator:
Sawicki, R H
Object Type:
Article
System:
The UNT Digital Library
The National Ignition Facility Wavefront Requirements and Optical Architecture
With the first four of its eventual 192 beams now executing shots, the National Ignition Facility (NIF) at the Lawrence Livermore National Laboratory is already the world's largest and most energetic laser. The optical system performance requirements that are in place for NIF are derived from the goals of the missions it is designed to serve. These missions include inertial confinement fusion (ICF) research and the study of matter at extreme energy densities and pressures. These mission requirements have led to a design strategy for achieving high quality focusable energy and power from the laser and to specifications on optics that are important for an ICF laser. The design of NIF utilizes a multipass architecture with a single large amplifier type that provides high gain, high extraction efficiency and high packing density. We have taken a systems engineering approach to the practical implementation of this design that specifies the wavefront parameters of individual optics in order to achieve the desired cumulative performance of the laser beamline. This presentation provides a detailed look at the causes and effects of performance degradation in large laser systems and how NIF has been designed to overcome these effects. We will also present results of …
Date:
January 5, 2004
Creator:
Spaeth, M. L.; Manes, K. R.; Widmayer, C. C.; Williams, W.; Whitman, P. A. & Henesian, M.
Object Type:
Article
System:
The UNT Digital Library
Perry Daily Journal (Perry, Okla.), Vol. 111, No. 2, Ed. 1 Monday, January 5, 2004
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
January 5, 2004
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Poroelastic Fluid Effects on Shear for Rocks with Soft Anisotropy
None
Date:
January 5, 2004
Creator:
Berger, E. L.
Object Type:
Article
System:
The UNT Digital Library
Posthearing Questions Related to the Department of Defense's Management of the Chemical Agents and Munitions Destruction Program
Correspondence issued by the General Accounting Office with an abstract that begins "Pursuant to a request by the Chairman and a Member of the Subcommittee on Terrorism, Unconventional Threats and Capabilities, House Committee on Armed Services, GAO responded to post-hearing questions concerning on DOD's Chemical Agents and Munitions Destruction Program."
Date:
January 5, 2004
Creator:
United States. General Accounting Office.
Object Type:
Text
System:
The UNT Digital Library
A relativistic O (a{sup 2}) improved action for heavy quarks
The authors extend the Fermilab formalism for heavy quarks to develop an {Omicron}(a{sup 2}) improved relativistic action. They discuss their construction of the action, including the identification of redundant operators and the calculation of the improvement coefficients.
Date:
January 5, 2004
Creator:
al., M. B. Oktay et
Object Type:
Article
System:
The UNT Digital Library
Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 88, No. 99, Ed. 1 Monday, January 5, 2004
Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.
Date:
January 5, 2004
Creator:
Broaddus, Matthew B.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
SCHIP: HHS Continues to Approve Waivers That Are Inconsistent with Program Goals
Correspondence issued by the General Accounting Office with an abstract that begins "States provide health care coverage to about 60 million low-income uninsured adults and children largely through two federal-state programs--Medicaid and the State Children's Health Insurance Program (SCHIP). Medicaid, established in title XIX of the Social Security Act, generally covers low-income families and elderly and disabled individuals, and SCHIP, established in title XXI of the act, covers children in families whose incomes, although low, are above Medicaid's eligibility requirements. In 2001, the Secretary of Health and Human Services announced a new initiative--the Health Insurance Flexibility and Accountability Initiative (HIFA)--under which states could expand coverage to uninsured populations using Medicaid and SCHIP funds. HIFA encourages states to develop coordinated public and private health insurance coverage options and to target program resources to uninsured individuals with incomes below 200 percent of the federal poverty level (FPL). Authority for this initiative comes from section 1115 of the Social Security Act, which allows the Secretary to waive many of the statutory requirements of Medicaid or SCHIP in the case of experimental, pilot, or demonstration projects that promote program objectives. Within the Department of Health and Human Services (HHS), the Centers for Medicare & …
Date:
January 5, 2004
Creator:
United States. General Accounting Office.
Object Type:
Text
System:
The UNT Digital Library
Search for New Physics at a Super-B Factory
The importance of a Super-B Factory in the search for New Physics, in particular, due to CP-od phase(s) from physics beyond the Standard Model is surveyed. The first point to emphasize is that we know now how to directly measure all three angles of the unitarity triangle very cleanly, i. e. without theoretical assumptions with irreducible theory error {le} 1%; however this requires much more luminosity than is currently available at B-factories. Direct searches via penguin-dominated hadronic modes as well as radiative, pair-leptonic and semi-leptonic decays are also discussed. Null tests of the SM are stressed as these will play a crucial role especially if the effects of BSM phase(s) on B-physics are small.
Date:
January 5, 2004
Creator:
Browder, T. E. & Soni, A.
Object Type:
Article
System:
The UNT Digital Library
Simple Derivation of the Hauser-Feshbach and Weisskopf-Ewing Formulae, with Application to Surrogate Reactions
The analysis of surrogate reactions, an indirect technique for determining cross sections on unstable nuclei, relies heavily on compound-nuclear reaction models. The purpose of this tutorial is to provide an introduction to the principal models, based on the Hauser-Feshbach and Weisskopf-Ewing formalisms, and to show how they are applied to surrogate reactions.
Date:
January 5, 2004
Creator:
Dietrich, F S
Object Type:
Report
System:
The UNT Digital Library
Summary of Texas Requirements For Entry of Livestock (Domestic and Exotic), Poultry and Ratites Into the State and into Shows, Fairs, Exhibitions, and Assemblies
Summarized laws and regulations related to livestock entering the state of Texas or livestock entries into various fairs and exhibitions. Regulations include quarantine procedures, veterinary inspections, permits, laws related to livestock from other states or from foreign countries, and other related information.
Date:
January 5, 2004
Creator:
Texas Animal Health Commission
Object Type:
Pamphlet
System:
The Portal to Texas History
Taste changing in staggered quarks
The authors present results from a systematic perturbative investigation of taste-changing in improved staggered quarks. They show one-loop taste-changing interactions can be removed perturbatively by an effective four-quark term and calculate the necessary coefficients.
Date:
January 5, 2004
Creator:
Mason, Quentin
Object Type:
Article
System:
The UNT Digital Library
Terahertz radiation from laser accelerated electron bunches
Coherent terahertz and millimeter wave radiation from laser accelerated electron bunches has been measured. The bunches were produced by tightly focusing (spot diameter {approx} 6 {micro}m) a high peak power (up to 10 TW), ultra-short ({ge}50 fs) laser pulse from a high repetition rate (10 Hz) laser system (0.8 {micro}m), onto a high density (>10{sup 19} cm{sup -3}) pulsed gas jet of length {approx} 1.5 mm. As the electrons exit the plasma, coherent transition radiation is generated at the plasma-vacuum boundary for wavelengths long compared to the bunch length. Radiation in the 0.3-19 THz range and at 94 GHz has been measured and found to depend quadratically on the bunch charge. The measured radiated energy for two different collection angles is in good agreement with theory. Modeling indicates that optimization of this table-top source could provide more than 100 {micro}J/pulse. Together with intrinsic synchronization to the laser pulse, this will enable numerous applications requiring intense terahertz radiation. This radiation can also be used as a powerful tool for measuring the properties of laser accelerated bunches at the exit of the plasma accelerator. Preliminary spectral measurements indicates that bunches as short as 30-50 fs have been produced in these laser driven …
Date:
January 5, 2004
Creator:
Leemans, W. P.; van Tilborg, J.; Faure, J.; Geddes, C. G. R.; Toth, Cs.; Schroe der, C. B. et al.
Object Type:
Article
System:
The UNT Digital Library
Three-dimensional Global Model Approaches to Understanding Stratospheric Impacts on Tropospheric Ozone
None
Date:
January 5, 2004
Creator:
Atherton, C; Bergmann, D; Cameron-Smith, P; Connell, P; Dignon, J; Rotman, D et al.
Object Type:
Article
System:
The UNT Digital Library