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611 Matching Results
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Strontium and barium iodide high light yield scintillators
Europium-doped strontium and barium iodide are found to be readily growable by the Bridgman method and to produce high scintillation light yields.
Date:
April 18, 2008
Creator:
Moses, William W; Cherepy, Nerine; Hull, Giulia; Drobshoff, Alexander; Payne, Stephen; van Loef, Edgar et al.
Object Type:
Article
System:
The UNT Digital Library
The Kinematics of Molecular Cloud Cores in the Presence of Driven and Decaying Turbulence: Comparisons with Observations
In this study we investigate the formation and properties of prestellar and protostellar cores using hydrodynamic, self-gravitating Adaptive Mesh Refinement simulations, comparing the cases where turbulence is continually driven and where it is allowed to decay. We model observations of these cores in the C{sup 18}O(2 {yields} 1), NH{sub 3}(1,1), and N{sub 2}H{sup +} (1 {yields} 0) lines, and from the simulated observations we measure the linewidths of individual cores, the linewidths of the surrounding gas, and the motions of the cores relative to one another. Some of these distributions are significantly different in the driven and decaying runs, making them potential diagnostics for determining whether the turbulence in observed star-forming clouds is driven or decaying. Comparing our simulations with observed cores in the Perseus and {rho} Ophiuchus clouds shows reasonably good agreement between the observed and simulated core-to-core velocity dispersions for both the driven and decaying cases. However, we find that the linewidths through protostellar cores in both simulations are too large compared to the observations. The disagreement is noticeably worse for the decaying simulation, in which cores show highly supersonic infall signatures in their centers that decrease toward their edges, a pattern not seen in the observed regions. …
Date:
April 18, 2008
Creator:
Offner, S R; Krumholz, M R; Klein, R I & McKee, C F
Object Type:
Report
System:
The UNT Digital Library
Interference effect in elastic parton energy loss in a finitemedium
Similar to the radiative parton energy loss due to gluonbremsstrahlung, elastic energy loss of a parton undergoing multiplescattering in a finite medium is demonstrated to be sensitive tointerference effect. The interference between amplitudes of elasticscattering via a gluon exchange and that of gluon radiation reduces theeffective elastic energy loss in a finite medium and gives rise to anon-trivial length dependence. The reduction is most significant for apropagation length L<4/\pi T in a medium with a temperature T. Thoughthe finite size effect is not significant for the average partonpropagation in the most central heavy-ion collisions, it will affect thecentrality dependence of its effect on jet quenching.
Date:
April 18, 2005
Creator:
Wang, Xin-Nian
Object Type:
Article
System:
The UNT Digital Library
Stewarding a Reduced Stockpile
The future of the US nuclear arsenal continues to be guided by two distinct drivers: the preservation of world peace and the prevention of further proliferation through our extended deterrent umbrella. Timely implementation of US nuclear policy decisions depends, in part, on the current state of stockpile weapons, their delivery systems, and the supporting infrastructure within the Department of Defense (DoD) and the Department of Energy's National Nuclear Security Administration (NNSA). In turn, the present is a product of past choices and world events. Now more than ever, the nuclear weapons program must respond to the changing global security environment and to increasing budget pressures with innovation and sound investments. As the nation transitions to a reduced stockpile, the successes of the Stockpile Stewardship Program (SSP) present options to transition to a sustainable complex better suited to stockpile size, national strategic goals and budgetary realities. Under any stockpile size, we must maintain essential human capital, forefront capabilities, and have a right-sized effective production capacity. We present new concepts for maintaining high confidence at low stockpile numbers and to effectively eliminate the reserve weapons within an optimized complex. We, as a nation, have choices to make on how we will achieve …
Date:
April 18, 2008
Creator:
Goodwin, B. T. & Mara, G.
Object Type:
Article
System:
The UNT Digital Library
Can Handheld Plastic Detectors Do Both Gamma and Neutron Isotopic Identification with Directional Source Location?
This paper demonstrates, through MCNPX simulations, that a compact hexagonal array of detectors can be utilized to do both gamma isotopic identification (ID) along with neutron identification while simultaneously finding the direction of the source relative to the detector array. The detector array itself is composed of seven borated polyvinyl toluene (PVT) hexagonal light pipes approximately 4 inches long and with a 1.25 inch face-to-face thickness assembled in a tight configuration. The gamma ID capability is realized through judicious windowing algorithms as is the neutron spectral unfolding. By having multiple detectors in different relative positions, directional determination of the source can be realized. By further adding multiplicity counters to the neutron counts, fission events can be measured.
Date:
April 18, 2008
Creator:
Hayes, Robert
Object Type:
Article
System:
The UNT Digital Library
Greensheet (Houston, Tex.), Vol. 37, No. 122, Ed. 1 Tuesday, April 18, 2006
Free weekly newspaper that includes business and classified advertising.
Date:
April 18, 2006
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 39, No. 130, Ed. 1 Friday, April 18, 2008
Free weekly newspaper that includes business and classified advertising.
Date:
April 18, 2008
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 39, No. 132, Ed. 1 Friday, April 18, 2008
Free weekly newspaper that includes business and classified advertising.
Date:
April 18, 2008
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
[Email from Catherine A. Murphy to Friends, April 18, 2006]
Printout of an email from Catherine A. Murphy to her friends advising them of her new email address and fax number. Two of the email addresses are underlined in blue ink.
Date:
April 18, 2006
Creator:
Murphy, Catherine A.
Object Type:
Letter
System:
The Portal to Texas History
[Email From David Stallman to Marianne Wood, April 18, 2009]
Electronic message from David Stallman to Marianne Wood, sent on Saturday, April 18, 2009 discussing Helen Snapp's confirmation of the source of several photographs that Stallman gives to Wood to use. It includes a printed Excel document with the personal information of several Women Airforce Service Pilots, all collected by Stallman, in addition to Women Pilots' Statistics and several pages of photographs of WASPs in both black and white and color.
Date:
April 18, 2009
Creator:
Stallman, David
Object Type:
Text
System:
The Portal to Texas History
Cherokeean Herald (Rusk, Tex.), Vol. 158, No. 8, Ed. 1 Wednesday, April 18, 2007
Weekly newspaper from Rusk, Texas that includes local, state and national news along with extensive advertising.
Date:
April 18, 2007
Creator:
Whitehead, Marie
Object Type:
Newspaper
System:
The Portal to Texas History
North Texas Daily (Denton, Tex.), Vol. 90, No. 103, Ed. 1 Tuesday, April 18, 2006
Daily student newspaper from the University of North Texas in Denton, Texas that includes local, state and campus news along with advertising.
Date:
April 18, 2006
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Scene: North Texas Daily (Denton, Tex.), Vol. 91, No. 52, Ed. 1 Friday, April 18, 2008
Weekly magazine edition of the daily student newspaper from the University of North Texas in Denton, Texas that includes local, state and campus news along with advertising.
Date:
April 18, 2008
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
North Texas Daily (Denton, Tex.), Vol. 91, No. 73, Ed. 1 Wednesday, April 18, 2007
Daily student newspaper from the University of North Texas in Denton, Texas that includes local, state and campus news along with advertising.
Date:
April 18, 2007
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The University News (Irving, Tex.), Vol. 37, No. 17, Ed. 1 Wednesday, April 18, 2007
Weekly student newspaper from the University of Dallas in Irving, Texas that includes campus news and commentaries along with advertising.
Date:
April 18, 2007
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Texas Attorney General Opinion: GA-0423
Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Greg Abbott, regarding a legal question submitted for clarification; Whether a physician, psychiatrist, licensed professional counselor, licensed marriage and family therapist, or social worker must be licensed by the Council on Sex Offender Treatment to provide rehabilitation services or act as a sex offender treatment provider (RQ-0405-GA)
Date:
April 18, 2006
Creator:
Texas. Attorney-General's Office.
Object Type:
Text
System:
The Portal to Texas History
[First aid skills are taught in the Early Education Program]
Mothers learn first aid skills as part of the Early Education Program in Fort Worth, Texas.
Date:
April 18, 2005
Creator:
Castillo, José L.
Object Type:
Photograph
System:
The UNT Digital Library
[Parents work in groups during a first aid class]
Parents work in groups during a first aid class that is part of the Early Education Program in Fort Worth, Texas.
Date:
April 18, 2006
Creator:
Castillo, José L.
Object Type:
Photograph
System:
The UNT Digital Library
[Parents participate in an Early Education Program class]
Parents receive instruction in first aid during an Early Education Program class in Fort Worth, Texas.
Date:
April 18, 2006
Creator:
Castillo, José L.
Object Type:
Photograph
System:
The UNT Digital Library
[Instructor helps mothers during a first aid class]
Mothers participate in a first aid class that is part of the Early Education Program in Fort Worth, Texas. The program is designed to help parents prepare their children for school.
Date:
April 18, 2005
Creator:
Castillo, José L.
Object Type:
Photograph
System:
The UNT Digital Library
[First aid class is taught as part of the Early Education Program]
First aid is taught as part of the Early Education Program in Fort Worth, Texas. The program is designed to help parents prepare their children for school.
Date:
April 18, 2005
Creator:
Castillo, José L.
Object Type:
Photograph
System:
The UNT Digital Library
[Parents take part in a first aid class]
Parents participate in a first aid class that is part of the Early Education Program of Fort Worth, Texas. The program seeks to help parents help prepare their children for school.
Date:
April 18, 2005
Creator:
Castillo, José L.
Object Type:
Photograph
System:
The UNT Digital Library
[Instructor talks a parent through first aid training]
An instructor talks a parent through a first aid class. The class is part of the Early Education Program of Fort Worth, Texas which seeks to help parents prepare their children for school.
Date:
April 18, 2006
Creator:
Castillo, José L.
Object Type:
Photograph
System:
The UNT Digital Library
[Instructor monitors a mother's progress learning first aid]
An instructor monitors a mother's performance during a first aid class. The class is part of the Early education Program of Fort Worth, Texas. The program helps parents acquire the skills to prepare their children for school
Date:
April 18, 2006
Creator:
Castillo, José L.
Object Type:
Photograph
System:
The UNT Digital Library