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671 Matching Results

Start Over Year 2006 Day 4th

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Results: 1 - 24 of 671 next

(open access)

Assessing Terrorist Motivations for Attacking Critical Infrastructure

Certain types of infrastructure--critical infrastructure (CI)--play vital roles in underpinning our economy, security and way of life. These complex and often interconnected systems have become so ubiquitous and essential to day-to-day life that they are easily taken for granted. Often it is only when the important services provided by such infrastructure are interrupted--when we lose easy access to electricity, health care, telecommunications, transportation or water, for example--that we are conscious of our great dependence on these networks and of the vulnerabilities that stem from such dependence. Unfortunately, it must be assumed that many terrorists are all too aware that CI facilities pose high-value targets that, if successfully attacked, have the potential to dramatically disrupt the normal rhythm of society, cause public fear and intimidation, and generate significant publicity. Indeed, revelations emerging at the time of this writing about Al Qaida's efforts to prepare for possible attacks on major financial facilities in New York, New Jersey, and the District of Columbia remind us just how real and immediate such threats to CI may be. Simply being aware that our nation's critical infrastructure presents terrorists with a plethora of targets, however, does little to mitigate the dangers of CI attacks. In order …

Date: December 4, 2006

Creator: Ackerman, G.; Abhayaratne, P.; Bale, J.; Bhattacharjee, A.; Blair, C.; Hansell, L. et al.

Object Type: Report

System: The UNT Digital Library

(open access)

Timpson & Tenaha News (Timpson, Tex.), Vol. 22, No. 18, Ed. 1 Thursday, May 4, 2006

Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.

Date: May 4, 2006

Creator: Alexander, Nancy

Object Type: Newspaper

System: The Portal to Texas History

transcript

Oral History Interview with Peter Almond, June 4, 2004

Interview with Dr. Peter Almond talking about the history radiation therapy. He outlines the various treatments including the x-ray, cobolt-60, betatron, magnetron, klystron and cyclotron. He also talks about the emerging field of proton therapy. He also describes the early history of radiotherapy at MD Anderson especially under the direction of Drs. Gilbert Fletcher and Leonard Grimmet.

Date: June 4, 2006

Creator: Almond, Peter; Brunet, Lesley Williams & Olson, James Stuart

Object Type: Sound

System: The Portal to Texas History

(open access)

Coordination of 1,4-Diazabutadiene Ligands to Decamethylytterbocene: Additional Examples of Spin Coupling in Ytterbocene Complexes

The paramagnetic 1:1 coordination complexes of (C5Me5)2Yb with a series of diazabutadiene ligands, RN=C(R')C(R')=NR, where R= CMe3, CHMe2, adamantyl, p-tolyl, p-anisyl, and mesityl when R'=H, and R= p-anisyl when R'= Me, have been prepared. The complexes are paramagnetic, but their magnetic moments are less than expected for the two uncoupled spin carriers, (C5Me5)2Yb(III, 4f13) and the diazabutadiene radical anions (S=1/2), which implies exchange coupling between the spins. The variable temperature 1H NMR spectra show that rotation about the R-N bond is hindered and these barriers are estimated. The barriers are largely determined by steric effects but electronic effects are not unimportant.

Date: November 4, 2006

Creator: Andersen, Richard; Walter, Marc D.; Berg, David J. & Andersen, Richard A.

Object Type: Article

System: The UNT Digital Library

(open access)

Reimbursement of Local Private Nonprofit Organizations Under the Stafford Act

None

Date: January 4, 2006

Creator: Angelheart, Ann

Object Type: Report

System: The UNT Digital Library

(open access)

Assessing the Effects of Radiation Damage on Ni-base Alloys for the Prometheus Space Reactor System

Ni-base alloys were considered for the Prometheus space reactor pressure vessel with operational parameters of {approx}900 K for 15 years and fluences up to 160 x 10{sup 20} n/cm{sup 2} (E > 0.1 MeV). This paper reviews the effects of irradiation on the behavior of Ni-base alloys and shows that radiation-induced swelling and creep are minor considerations compared to significant embrittlement with neutron exposure. While the mechanism responsible for radiation-induced embrittlement is not fully understood, it is likely a combination of helium embrittlement and solute segregation that can be highly dependent on the alloy composition and exposure conditions. Transmutation calculations show that detrimental helium levels would be expected at the end of life for the inner safety rod vessel (thimble) and possibly the outer pressure vessel, primarily from high energy (E > 1 MeV) n,{alpha} reactions with {sup 58}Ni. Helium from {sup 10}B is significant only for the outer vessel due to the proximity of the outer vessel to the BeO control elements. Recommendations for further assessments of the material behavior and methods to minimize the effects of radiation damage through alloy design are provided.

Date: April 4, 2006

Creator: Angeliu, T.; Ward, J. & Witter, J.

Object Type: Report

System: The UNT Digital Library