IMC Post: A Comparison of QC Tensile Tests, and Finite Element Analysis Results (open access)

IMC Post: A Comparison of QC Tensile Tests, and Finite Element Analysis Results

None
Date: December 25, 1991
Creator: Alforque, R. & Sondericker, J. H.
Object Type: Report
System: The UNT Digital Library
Analysis of community structure in networks of correlated data (open access)

Analysis of community structure in networks of correlated data

We present a reformulation of modularity that allows the analysis of the community structure in networks of correlated data. The new modularity preserves the probabilistic semantics of the original definition even when the network is directed, weighted, signed, and has self-loops. This is the most general condition one can find in the study of any network, in particular those defined from correlated data. We apply our results to a real network of correlated data between stores in the city of Lyon (France).
Date: December 25, 2008
Creator: Gomez, S.; Jensen, P. & Arenas, A.
Object Type: Article
System: The UNT Digital Library
Quantum efficiency characterization of LBNL CCD's Part 1: theQuantum Efficiency Machine (open access)

Quantum efficiency characterization of LBNL CCD's Part 1: theQuantum Efficiency Machine

Instrumentation was developed in 2004 and 2005 to measurethe quantum efficiency of the Lawrence Berkeley National Lab(LBNL)total-depletion CCD's, intended for astronomy and spaceapplications. This paper describes the basic instrument. Although it isconventional even to the parts list, there are important innovations. Axenon arc light source was chosen for its high blue/UV and low red/IRoutput as compared with a tungsten light. Intensity stabilization hasbeen difficult, but sinceonly flux ratios matter this is not critical.Between the light source andan Oriel MS257 monochromator are a shutterand two filter wheels. High-bandpass and low-bandpass filter pairsisolate the 150-nm wide bands appropriate to the wavelength, thusminimizing scattered light and providing order blocking. Light from theauxiliary port enters a 20-inch optical sphere, and the 4-inch outputport is at right angles to the input port. An 80 cm drift space producesnear-uniform illumination on the CCD. Next to the cold CCD inside thehorizontal dewar is a calibrated reference photodiode which is regulatedto the PD calibration temperature, 25$^\circ$ C. The ratio ofthe CCD andin-dewar reference PD signals provides the QE measurement. Additionalcross-calibration to a PD on the integrating spherepermitslower-intensity exposures.
Date: December 25, 2005
Creator: Groom, Donald E.; Bebek, Christopher J.; Fabricius, Maximilian; Karcher, Armin; Kolbe, William F.; Roe, Natalie A. et al.
Object Type: Article
System: The UNT Digital Library
Slag characterization and removal using pulse detonation for coal gasification. Quarterly research report, October--December, 1995 (open access)

Slag characterization and removal using pulse detonation for coal gasification. Quarterly research report, October--December, 1995

Experiments will mainly focus on breaking the bonds within the slag itself using detonation wave. For the experiments, initial suggestion was to build up slag deposit around a representative tube by placing it inside the convection pass of an actual boiler at the Northern States Power Company. But it was later concluded that once the tube is cooled to room condition, the thermal stress will greatly reduce the bonding between the heat transfer surface and the slag. It was concluded that the slag will be attached to the tube using high density epoxy resin. High density epoxy will be used so that they do not diffuse into the slag and strengthen the bonding within the slag. Suggestions on candidate epoxy are provided by MTI lab. MTI also provided PVAMU with different kinds of slags for testing. The deposits for characterization were from a subbituminous coal fired utility boiler.
Date: December 25, 1995
Creator: Huque, Z.; Zhou, J.; Mei, D. & Biney, P.O.
Object Type: Report
System: The UNT Digital Library
Environmental testing SNAP 10A fuel elements (open access)

Environmental testing SNAP 10A fuel elements

None
Date: December 25, 1965
Creator: Isaacs, J.L.
Object Type: Report
System: The UNT Digital Library
[Cloning-idependent mapping technology for genomic fidelity, contig linking, C-DNA site analysis, and gene detection]. Final report (open access)

[Cloning-idependent mapping technology for genomic fidelity, contig linking, C-DNA site analysis, and gene detection]. Final report

The project was designed to develop and apply a novel unconventional approach to genome mapping based on physical properties of DNA that are a sensitive function of the base sequence, and so does not depend on the clonability of the sequences to be mapped nor on the presence of particular restriction sites. We have shown that a broad array of DNA fragments are retarded at nearly the same level in denaturing gradient gel electrophoresis (DGGE) if the segment with the lowest thermal stability has the same melting temperature, regardless of the length of the fragment. The retarded pattern remain steady in the gel, changing little with continued field exposure. Mapping proceeds by the analysis of two-dimensional patterns produced by random fragmentation of genomic DNA and denaturing gradient gel electrophoresis. Random fragments are first separated according to length by conventional agarose electrophoresis. The result is a two- dimensional pattern which can be idealized as an array of nearly parallel, mostly separated lines of DNA. The pattern is blotted onto a membrane and probed sequentially with oligos or relevant DNA or RNA fragments. The endpoints on the fragment length scale of each line hybridizing with each probe, the distribution along each line, …
Date: December 25, 1994
Creator: Lerman, L. S.
Object Type: Report
System: The UNT Digital Library
Pump Outs, General and D0 Considerations (open access)

Pump Outs, General and D0 Considerations

Seal Pump Outs (PO) are provided by specifically designing and providing redundant, or double, seals to create an annular volume that can be '(vacuum) pumped out' to test the integrity of both seals. The value of the technique is most readily apparent in the construction of large piping systems or vessels whose closure is on a different schedule than the nozzle closures, or whose nozzles are serially closed. In the case of D0, for instance, the high voltage boxes were put in place and leak checked before the vessel was closed and independent of the other nozzles. PO use is by no means limited to cryogenics and the supporting vacuum systems, but the discussion here will be limited to cryogenic applications. POs come in two generic service types; installation, and installation and monitor. The above high voltage box is an example of a static installation service application. Once the item is installed the PO can be, and almost universally is, capped, and revisited only on disassembly and reassembly. POs are constantly monitored after installation only when their seals, through cooldown gradient induced motion, vibration, cyclic load bolt seating, or other dynamic phenomena may degrade in performance over time. PO seals …
Date: December 25, 1990
Creator: Mulholland, G.T.
Object Type: Report
System: The UNT Digital Library
RbGd{sub 2}Br{sub 7}:Ce scintillators for gamma ray and thermal neutron detection (open access)

RbGd{sub 2}Br{sub 7}:Ce scintillators for gamma ray and thermal neutron detection

In this paper, we report on gamma ray and thermal neutron detection with RbGd2Br7:Ce scintillators. RbGd2Br7:Ce (RGB) is a new scintillator material, which shows high light output (56,000 photons/MeV) and has a fast principal decay constant (45 ns) when doped with 10 percent Ce. These properties make RGB an attractive scintillator for g-ray detection. Also, due to the presence of Gd as a constituent, RGB has a high cross section for thermal neutron absorption and can achieve close to 100 percent stopping efficiency with 0.5 mm thick RGB crystals. Crystals of RGB with three different Ce concentrations (0.1, 5, and 10 percent) have been grown and their basic scintillation properties such as light output, decay time, and emission spectrum have been measured. In addition, high efficiency thermal neutron detection has been confirmed in our studies.
Date: December 25, 2001
Creator: Shah, Kanai S.; Cirignano, Leonard; Grazioso, Ronald; Klugerman, Misha; Bennett, Paul R.; Gupta, Tapan K. et al.
Object Type: Article
System: The UNT Digital Library