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80,130 Matching Results

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(open access)

A Measurement of the Spatial Distribution of Diffuse TeV Gamma Ray Emission from the Galactic Plane with Milagro

Diffuse {gamma}-ray emission produced by the interaction of cosmic-ray particles with matter and radiation in the Galaxy can be used to probe the distribution of cosmic rays and their sources in different regions of the Galaxy. With its large field of view and long observation time, the Milagro Gamma Ray Observatory is an ideal instrument for surveying large regions of the Northern Hemisphere sky and for detecting diffuse {gamma}-ray emission at very high energies. Here, the spatial distribution and the flux of the diffuse {gamma}-ray emission in the TeV energy range with a median energy of 15 TeV for Galactic longitudes between 30{sup o} and 110{sup o} and between 136{sup o} and 216{sup o} and for Galactic latitudes between -10{sup o} and 10{sup o} are determined. The measured fluxes are consistent with predictions of the GALPROP model everywhere except for the Cygnus region (l {element_of} [65{sup o}, 85{sup o}]). For the Cygnus region, the flux is twice the predicted value. This excess can be explained by the presence of active cosmic ray sources accelerating hadrons which interact with the local dense interstellar medium and produce gamma rays through pion decay.

Date: May 14, 2008

Creator: Abdo, A. A.; Allen, B.; Aune, T.; Berley, D.; Blaufuss, E.; Casanova, S. et al.

Object Type: Article

System: The UNT Digital Library

(open access)

Measurement of the Cosmic Ray e+ plus e- Spectrum from 20 GeV to 1 TeV with the Fermi Large Area Telescope

Designed as a high-sensitivity gamma-ray observatory, the Fermi Large Area Telescope is also an electron detector with a large acceptance exceeding 2 m{sup 2}sr at 300 GeV. Building on the gamma-ray analysis, we have developed an efficient electron detection strategy which provides sufficient background rejection for measurement of the steeply-falling electron spectrum up to 1 TeV. Our high precision data show that the electron spectrum falls with energy as E{sup -3.0} and does not exhibit prominent spectral features. Interpretations in terms of a conventional diffusive model as well as a potential local extra component are briefly discussed.

Date: May 14, 2012

Creator: Abdo, Aous A.; /Naval Research Lab, Wash., D.C.; Ackermann, M.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Ajello, M.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. et al.

Object Type: Article

System: The UNT Digital Library

(open access)

Direct Measurement of A{sub c} using Inclusive Charm Tagging at the SLD Detector

We report a new measurement of A{sub c} using data obtained by SLD in 1993-98. This measurement uses a vertex tag technique, where the selection of a c hemisphere is based on the reconstructed mass of the charm hadron decay vertex. The method uses the 3D vertexing capabilities of SLD's CCD vertex detector and the small and stable SLC beams to obtain a high c-event tagging efficiency and purity of 28% and 82%, respectively. Charged kaons identified by the CRID detector and the charge of the reconstructed vertex provide an efficient quark-antiquark tag, with the analyzing power calibrated from the data. We obtain a preliminary result of A{sub c} = 0.603 {+-} 0.028 {+-} 0.023.

Date: July 14, 1999

Creator: Abe, K

Object Type: Report

System: The UNT Digital Library

(open access)

Current Performance of the SLD VXD3

During 1996, the SLD collaboration completed construction and began operation of a new charge-coupled device (CCD) vertex detector (VXD3). Since then, its performance has been studied in detail and a new topological vertexing technique has been developed. In this paper, we discuss the design of VXD3, procedures for aligning it, and the tracking and vertexing improvements that have led to its world-record performance.

Date: September 14, 1999

Creator: Abe, Toshinori

Object Type: Report

System: The UNT Digital Library

(open access)

Electricity: The Road Toward Restructuring

The Public Utility Holding Company Act of 1935 (PUHCA) and the Federal Power Act (FPA) were enacted to eliminate unfair practices and other abuses by electricity and gas holding companies by requiring federal control and regulation of interstate public utility holding companies. Comprehensive energy legislation has passed the House and Senate. The House passed H.R. 6 on April 11, 2003. On July 31, 2003, the Senate suspended debate on S. 14, inserted the text of H.R. 4 (107th Congress) as a substitute, and passed H.R. 6. A conference agreement was reached November 17, 2003, and passed by the House the next day. H.R. 6 includes an electricity title that would, in part, repeal PUHCA, would prospectively repeal the mandatory purchase requirement under PURPA, and would create an electric reliability organization. On June 15, 2004, H.R. 4503, a comprehensive energy policy bill, passed the House.

Date: March 14, 2003

Creator: Abel, Amy & Parker, Larry

Object Type: Report

System: The UNT Digital Library

(open access)

[Letter from Julie Abel to William McCarter, June 14, 1995]

Letter from Julie Abel to William McCarter acknowledging two enclosed original grant copies for NTIEVA.

Date: June 14, 1995

Creator: Abel, Julie

Object Type: Letter

System: The UNT Digital Library

(open access)

[RE: Arts Education Assessment Consortium, September 14, 1994]

Photocopy of a letter from Julie Abel, the Getty Center, to the Regional Institute Directors, in regards to the upcoming arts assessment. The Arts Education Assessment Consortium, AEAC, is administered by the Council of Chief State School Officers to all the RIG states. The Center is providing support to the AEAC to develop assessment prototypes in the visual and performing arts and believes that if the DBAE, discipline-based art education, is embedded in the assessment prototypes it will strengthen the impact within the state and nationally. A list of state contacts is attached to the letter.

Date: September 14, 1994

Creator: Abel, Julie

Object Type: Letter

System: The UNT Digital Library

(open access)

[RE: Goals 2000 Arts Education Partnership Meeting Notes]

Photocopy of a memo from Julie Abel, program associate of the Getty Center for Education in the Arts, to the Regional Institute Grant Directors. The memo is in regards to the key points and recommendations from the September 20, 1996 Goals 2000 Arts Educational Leadership fund meeting. Attached with the memo is the meeting report.

Date: October 14, 1996

Creator: Abel, Julie

Object Type: Letter

System: The UNT Digital Library

(open access)

[RE: Ground Transpiration Information]

A memo from Julie Abel, program associate for Getty Center for Education in the Arts, to the participants in the Regional Institute Directors' Meeting. The memo is in regards to prior correspondence from Vicki Rosenberg, who gave the directors information on the upcoming director's meeting, Abel's memo is about ground transportation for the directors from the Santa Barbara airport to the El Encanto Hotel.

Date: January 14, 1992

Creator: Abel, Julie

Object Type: Letter

System: The UNT Digital Library

(open access)

[RE: Surf the Net for the first Rig Directors Forum!]

E-mail correspondence from Julie Abel, Program Associate, Getty Center for Education in the Arts, to the Regional Institute Directors. The e-mail is in regards to the January 1995 Director's meeting about findings from the 1994 Cross-Site report as a way to begin communicating in cyberspace. Abel requests that the directors share their thoughts and ideas about and solutions to major issues discussed in the report between March 15 and April 14. cc'd in the letter are Julie Abel, Candy Borland, David Pankratz, Blanche Rubin, Miki Baumgarten, Lani Duke, Vicki Rosenberg and Brent Wilson.

Date: April 14, 1995

Creator: Abel, Julie

Object Type: Letter

System: The UNT Digital Library

(open access)

[Letter to Dr. R. William McCarter from Julie Anne Abel, with attached grant offer letter, budget, guidelines, and timeline - June 14, 1995]

A letter to Dr. R. William McCarter from Julie Anne Abel regarding a grant from the Getty Education Institute for the Arts to the North Texas Institute for Educators on the Visual Arts (NTIEVA). Attached documents appear as follows: Grant offer letter; "Approved FY96 Budget"; "FY96 Reporting Guidelines"; "FY97 Grant Guidelines and Application Procedures"; "FY96 RIG Travel Fund Grant Guidelines"; and "Important Dates."

Date: June 14, 1995

Creator: Abel, Julie A.

Object Type: Letter

System: The UNT Digital Library

(open access)

[Letter from Julie Anne Abel to Nancy Berry, July 14, 1997]

A letter from Julie Anne Abel to Nancy Berry about clarifying objects for a proposal for the National Center for Art Museum/School Collaborations during the 1998 fiscal year. Attached documents include a letter from Nancy Berry to Julie Anne Abel and Vicki Rosenberg.

Date: July 14, 1997

Creator: Abel, Julie Anne

Object Type: Letter

System: The UNT Digital Library

(open access)

[E-mail from Julie Anne Abel to D. Jack Davis and R. William McCarter, September 14, 1994]

An e-mail from Julie Anne Abel to D. Jack Davis and R. William McCarter about informing them that the Getty Center for Education in the Arts has approved their National Specialty Program development grant. Attached document is a budget.

Date: September 14, 1994

Creator: Abel, Julie Anne

Object Type: Letter

System: The UNT Digital Library

(open access)

300 Degree C GaN/AlGaN Heterojunction Bipolar Transistor

A GaN/AIGaN heterojunction bipolar transistor has been fabricated using C12/Ar dry etching for mesa formation. As the hole concentration increases due to more efficient ionization of the Mg acceptors at elevated temperatures (> 250oC), the device shows improved gain. Future efforts which are briefly summarized. should focus on methods for reducing base resistance.

Date: October 14, 1998

Creator: Abernathy, C. R.; Baca, A. G.; Cho, H.; Chow, P. P.; Han, J.; Hichman, R. A. et al.

Object Type: Article

System: The UNT Digital Library

(open access)

Effect of Temperature on GaGdO/GaN Metal Oxide Semiconductor Field Effect Transistors

GaGdO was deposited on GaN for use as a gate dielectric in order to fabricate a depletion metal oxide semiconductor field effect transistor (MOSFET). This is the fmt demonstration of such a device in the III-Nitride system. Analysis of the effect of temperature on the device shows that gate leakage is significantly reduced at elevated temperature relative to a conventional metal semiconductor field effeet transistor (MESFET) fabricated on the same GaN layer. MOSFET device operation in fact improved upon heating to 400 C. Modeling of the effeet of temperature on contact resistance suggests that the improvement is due to a reduction in the parasitic resistances present in the device.

Date: October 14, 1998

Creator: Abernathy, C. R.; Baca, A.; Chu, S. N. G.; Hong, M.; Lothian, J. R.; Marcus, M. A. et al.

Object Type: Article

System: The UNT Digital Library

(open access)

Damage to III-V Devices During Electron Cyclotron Resonance Chemical Vapor Deposition

GaAs-based metal semiconductor field effect transistors (MESFETS), heterojunction bipolar transistors (HBTs) and high electron mobility transistors (HEMTs) have been exposed to ECR SiJ&/NH3 discharges for deposition of SiNX passivating layers. The effect of source power, rf chuck power, pressure and plasma composition have been investigated. Effects due to both ion damage and hydrogenation of dopants are observed. For both HEMTs and MESFETS there are no conditions where substantial increases in channel sheet resistivity are not observed, due primarily to (Si-H)O complex formation. In HBTs the carbon-doped base layer is the most susceptible layer to hydrogenation. Ion damage in all three devices is minimized at low rf chuck power, moderate ECR source power and high deposition rates.

Date: October 14, 1998

Creator: Abernathy, C.R.; Hahn, Y.B.; Hays, D.C.; Johnson, D.; Lee, J.W.; MacKenzie, K. et al.

Object Type: Article

System: The UNT Digital Library

(open access)

[Abilene City Council Minutes: 1896-1909]

Ledger containing minutes of the City Council in Abilene, Texas documenting the group's discussions and activities from April 14, 1896 to April 20, 1909.

Date: 1896-04-14/1909-04-20

Creator: Abilene (Tex.)

Object Type: Book

System: The Portal to Texas History

(open access)

[Abilene City Council Minutes: 1980-1982]

Ledger containing minutes of the City Council in Abilene, Texas documenting the group's discussions and activities from August 1980 through February 1982.

Date: 1980-08-14/1982-02-11

Creator: Abilene (Tex.)

Object Type: Book

System: The Portal to Texas History

(open access)

[Abilene City Council Minutes: 1988]

Ledger containing minutes of the City Council in Abilene, Texas documenting the group's discussions and activities from January to December 1988.

Date: 1988-01-14/1988-12-15

Creator: Abilene (Tex.)

Object Type: Book

System: The Portal to Texas History

(open access)

[Abilene City Council Minutes: 1999]

Ledger containing minutes of the City Council in Abilene, Texas documenting the group's discussions and activities from January 14, 1999 to December 16, 1999.

Date: 1999-01-14/1999-12-16

Creator: Abilene (Tex.)

Object Type: Book

System: The Portal to Texas History

(open access)

[Abilene City Council Minutes: 2010]

Ledger containing minutes of the City Council in Abilene, Texas documenting the group's discussions and activities from January 14, 2010 to December 16, 2010.

Date: 2010-01-14/2010-12-16

Creator: Abilene (Tex.)

Object Type: Book

System: The Portal to Texas History

(open access)

[Letter from the Abilene Fire & Casualty Exchange to Truett Latimer, February 14, 1955]

Letter from the Abilene Fire & Casualty Exchange to Truett Latimer discussing support for Texas House Bill #173 without any amendments.

Date: February 14, 1955

Creator: Abilene Fire & Casualty Exchange

Object Type: Letter

System: The Portal to Texas History

(open access)

The Redbird (Beaumont, Tex.), Vol. 5, No. 5, Ed. 1 Thursday, March 14, 1946

Monthly newspaper from Lamar College in Beaumont, Texas that includes local and campus news along with advertising.

Date: March 14, 1946

Creator: Abood, George

Object Type: Newspaper

System: The Portal to Texas History

(open access)

Corrosion testing of stainless steel-zirconium metal waste form.

Stainless steel-zirconium (SS-Zr) alloys are being considered as waste forms for the disposition of metallic waste generated during the electrometallurgical treatment of spent nuclear fuel. The waste forms contain irradiated cladding hulls, components of the alloy fuel, noble metal fission products, and actinide elements. The baseline waste form is a stainless steel-15 wt% zirconium (SS-15Zr) alloy. This article presents microstructure and some of the corrosion studies being conducted on the waste form alloys. Electrochemical corrosion, immersion corrosion, and vapor hydration tests have been performed on various alloy compositions to evaluate corrosion behavior and resistance to selective leaching of simulated fission products. The SS-Zr waste forms are successful at the immobilization and retention of fission products and show potential for acceptance as high-level nuclear waste forms.

Date: December 14, 1998

Creator: Abraham, D. P.

Object Type: Article

System: The UNT Digital Library

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