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415 Matching Results

Start Over Access Open Access Year 1993 Day 5th Language English

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(open access)

The coordination and atom transfer chemistry of titanium porphyrin complexes

Preparation, characterization, and reactivity of ({eta}{sup 2}- alkyne)(meso-tetratolylpoprphrinato)titanium(II) complexes are described, along with inetermetal oxygen atom transfer reactions involving Ti(IV) and Ti(III) porphyrin complexes. The {eta}{sup 2}- alkyne complexes are prepared by reaction of (TTP)TiCl{sub 2} with LiAlH{sub 4} in presence of alkyne. Structure of (OEP)Ti({eta}{sup 2}-Ph-C{triple_bond}C-Ph) (OEP=octaethylporphryin) was determined by XRD. The compounds undergo simple substitution to displace the alkyne and produce doubly substituted complexes. Structure of (TTP)Ti(4-picoline){sub 2} was also determined by XRD. Reaction of (TTP)Ti{double_bond}O with (OEP)Ti-Cl yields intermetal O/Cl exchange, which is a one-electron redox process mediated by O atom transfer. Also a zero-electron redox process mediated by atom transfer is observed when (TTP)TiCl{sub 2} is reacted with (OEP)Ti{double_bond}O.

Date: November 5, 1993

Creator: Hays, J. A.

Object Type: Thesis or Dissertation

System: The UNT Digital Library

(open access)

Status of {alpha}{sub s} measurements

I review the current determinations of {alpha}{sub s}. Attention is given to the theoretical uncertainties inherent in most determinations. all current determinations are consistent with an average of {alpha}{sub s}(M{sub Z}) = 0.119{plus_minus}0.005. Prospects for reduction of the errors in the future are discussed.

Date: May 5, 1993

Creator: Hinchliffe, I.

Object Type: Article

System: The UNT Digital Library

(open access)

South Texas Catholic (Corpus Christi, Tex.), Vol. 28, No. 3, Ed. 1 Friday, February 5, 1993

Bi-weekly newspaper from Corpus Christi, Texas published by the Diocese of Corpus Christi that includes news of interest to Diocese members along with advertising.

Date: February 5, 1993

Creator: Horseman, Pete & Vega, John Michael

Object Type: Newspaper

System: The Portal to Texas History

(open access)

South Texas Catholic (Corpus Christi, Tex.), Vol. 28, No. 5, Ed. 1 Friday, March 5, 1993

Bi-weekly newspaper from Corpus Christi, Texas published by the Diocese of Corpus Christi that includes news of interest to Diocese members along with advertising.

Date: March 5, 1993

Creator: Horseman, Pete & Vega, John Michael

Object Type: Newspaper

System: The Portal to Texas History

(open access)

The Rice Thresher (Houston, Tex.), Vol. 81, No. 11, Ed. 1 Friday, November 5, 1993

A weekly student newspaper from the Rice University in Houston, Texas that includes campus news and commentaries along with advertising.

Date: November 5, 1993

Creator: Howley, Peter & Epperson, Kraettli

Object Type: Newspaper

System: The Portal to Texas History

(open access)

Relativistic heavy-ion collisions. 1993 annual report

This is a brief report on the work done last year from November 1992 to October 1993. Out of the various areas of research proposed for the three-year period 1993--96, we have successfully carried out investigation in three topics: quark-hadron phase transition, hadron production, and multifractal structure. The results are summarized.

Date: November 5, 1993

Creator: Hwa, R. C.

Object Type: Report

System: The UNT Digital Library

(open access)

Anaerobic biprocessing of low rank coals. Final technical report, September 12, 1990--August 10, 1993

Coal solubilization under aerobic conditions results in oxygenated coal product which, in turn, makes the coal poorer fuel than the starting material. A novel approach has been made in this project is to remove oxygen from coal by reductive decarboxylation. In Wyodak subbituminous coal the major oxygen functionality is carboxylic groups which exist predominantly as carboxylate anions strongly chelating metal cations like Ca{sup 2+} and forming strong macromolecular crosslinks which contribute in large measure to network polymer structure. Removal of the carboxylic groups at ambient temperature by anaerobic organisms would unravel the macromoleculer network, resulting in smaller coal macromolecules with increased H/C ratio which has better fuel value and better processing prospects. These studies described here sought to find biological methods to remove carboxylic functionalities from low rank coals under ambient conditions and to assess the properties of these modified coals towards coal liquefaction. Efforts were made to establish anaerobic microbial consortia having decarboxylating ability, decarboxylate coal with the adapted microbial consortia, isolate the organisms, and characterize the biotreated coal products. Production of CO{sup 2} was used as the primary indicator for possible coal decarboxylation.

Date: August 5, 1993

Creator: Jain, M. K. & Narayan, R.

Object Type: Report

System: The UNT Digital Library

(open access)

Measurement of source tube radial position in cast EMC testbeam module

Using a {sup 137}Cs source we have determined the position of two of the source tubes embedded in the Pb absorber in the cast EMC module used in the Fermilab test beam. Two scintillator tiles placed in the gaps on both sides of an absorber containing a source tube were readout into independent phototubes. The difference in scintillator response was measured in two towers at two different source tube layers. We find the source tube to be displaced towards the (radial) front of the EMC by about 1.6 mm in both measurements. Work is proceeding now to check other source tubes in other locations.

Date: May 5, 1993

Creator: Jankowski, D. J. & Stanek, R.

Object Type: Report

System: The UNT Digital Library

(open access)

Environmental Release Prevention and Control Plan (ERP and CP) annual review and update for 1993

In the Environmental Release Prevention and Control Plan (ERP and CP), WSRC made a commitment to conduct the following follow-up activities and actions: (1) Complete the action items developed in response to the findings and recommendation of the Environmental Release Prevention Taskteam (WSRC-RP-92-356). (2) Complete all batch and continuous release procedure revisions to incorporate the attributes that WSRC senior management required of each procedure. (3) DOE-SR Assistance Managers and WSRC counterparts to reach consensus and closure on the identified engineered solutions documented in the ERP and CP, develop and drive implementation of facility changes per the agreements. (4) Continue to analyze releases and monitor performance in accordance with the ERP and CP, and utilize the ALARA Release Guides Committee to drive improvements. (5) Conduct annual re-evaluations of the cost benefit analyses of the identified engineered solutions, and identify new options and alternatives for each outfall in response to site mission and facility changes. This report documents the efforts that have been completed over the past year in response to these commitments.

Date: October 5, 1993

Creator: Jannik, G.T.; Mamatey, A. & Arnett, M.

Object Type: Report

System: The UNT Digital Library

(open access)

2000 and Beyond: Can the Government Govern?

Text for a speech given by Barbara C. Jordan for the National Association of Purchasing Management in San Antonio, Texas. The speech is about the upcoming end of the 20th century and its implications for the American government.

Date: May 5, 1993

Creator: Jordan, Barbara C.

Object Type: Text

System: The Portal to Texas History

(open access)

Port Aransas South Jetty (Port Aransas, Tex.), Vol. 23, No. 31, Ed. 1 Thursday, August 5, 1993

Weekly newspaper from Port Aransas, Texas on Mustang Island that includes local, state and national news along with extensive advertising.

Date: August 5, 1993

Creator: Judson, Mary

Object Type: Newspaper

System: The Portal to Texas History

captions transcript

[News Clip: American Airlines]

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.

Date: February 5, 1993, 6:00 p.m.

Creator: KXAS-TV (Television station : Fort Worth, Tex.)

Object Type: Video

System: The UNT Digital Library

captions transcript

[News Clip: American Airlines]

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.

Date: February 5, 1993, 6:00 p.m.

Creator: KXAS-TV (Television station : Fort Worth, Tex.)

Object Type: Video

System: The UNT Digital Library

captions transcript

[News Clip: Arlington Stadium Parrots]

Video footage from the KXAS-TV television station in Fort Worth, Texas, covering a news story.

Date: October 5, 1993, 5:00 p.m.

Creator: KXAS-TV (Television station : Fort Worth, Tex.)

Object Type: Video

System: The UNT Digital Library

captions transcript

[News Clip: ATF Funerals]

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story about the death of and memorial for Alcohol, Tobacco, and Firearms (ATF) agent Steve Willis of Houston who was killed in the raid of the Branch Davidian compound. This story aired at 5 PM.

Date: March 5, 1993

Creator: KXAS-TV (Television station : Fort Worth, Tex.)

Object Type: Video

System: The UNT Digital Library

captions transcript

[News Clip: ATF Newser]

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story about recent developments in the standoff between federal agents and Branch Davidians in Waco, Texas following a raid by Alcohol Tobacco and Firearms (ATF) agents. This footage includes a press conference with ATF agent Dan Conroy, FBI Assistant Special Agent in Charge Bob Ricks, and one unidentified man. This story was broadcast at noon.

Date: March 5, 1993

Creator: KXAS-TV (Television station : Fort Worth, Tex.)

Object Type: Video

System: The UNT Digital Library

captions transcript

[News Clip: ATF Newser]

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story about conversations with Branch Davidian leader David Koresh and conversations between Koresh and the FBI. This footage includes a press conference with FBI Assistant Special Agent in Charge Bob Ricks and footage of children released. This story was broadcast at 5 PM.

Date: March 5, 1993

Creator: KXAS-TV (Television station : Fort Worth, Tex.)

Object Type: Video

System: The UNT Digital Library