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Ambient-temperature Conditioning as a Probe of Double-C Transformation Mechanisms in Pu-2.0 at. % Ga

Description: The gallium-stabilized Pu-2.0 at. % Ga alloy undergoes a partial or incomplete low-temperature martensitic transformation from the metastable {delta} phase to the gallium-containing, monoclinic {alpha}{prime} phase near -100 C. This transformation has been shown to occur isothermally and it displays anomalous double-C kinetics in a time-temperature-transformation (TTT) diagram, where two nose temperatures anchoring an upper- and lower-C describe minima in the time for the initiation of transfor… more
Date: April 2, 2008
Creator: Jeffries, J R; Blobaum, K M; Wall, M A & Schwartz, A J
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Selective catalysis utilizing bifunctionalized MCM-41 mesoporous materials

Description: Selective catalysis is a field that has been under intense investigation for the last 100 years. The most widely used method involves catalysts with stereochemical selectivity. In this type of catalysis, the catalyst controls which reactants will be transformed into the desired product. The secret to employing this type of catalysis, though, is to design the proper catalyst, which can be difficult. One may spend as much time developing the catalyst as spent separating the various products achie… more
Date: May 1, 2005
Creator: Strosahl, Kasey Jean
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries Government Documents Department
open access

Direct laboratory tensile testing of select yielding rock bolt systems

Description: Yielding rock bolt support systems have been developed to accommodate ground movement in shifting ground such as in coal operations; in creeping ground such as salt, trona, and potash; and in swelling ground associated with some clays. These systems, designed to remain intact despite ground movement, should enhance mine safety and help contain costs in areas where rebolting of rigid non-yielding systems is typically required. Four such systems were tested in straight tensile pulls in the labora… more
Date: August 1, 1996
Creator: VandeKraats, J. D. & Watson, S. O.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

HSQ double patterning process for 12 nm resolution x-ray zone plates

Description: Soft x-ray zone plate microscopy is a powerful nano-analytic technique used for a wide variety of scientific and technological studies. Pushing its spatial resolution to 10 nm and below is highly desired and feasible due to the short wavelength of soft x-rays. Instruments using Fresnel zone plate lenses achieve a spatial resolution approximately equal to the smallest, outer most zone width. We developed a double patterning zone plate fabrication process based on a high-resolution resist, hydrog… more
Date: June 16, 2009
Creator: Chao, Weilun; Kim, Jihoon; Rekawa, Senajith; Fischer, Peter & Anderson, Erik H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Modeling AFM Induced Mechanical Deformation of Living Cells

Description: Finite element modeling has been applied to study deformation of living cells in Atomic Force Microscopy (AFM) and particularly Recognition Force Microscopy (RFM). The abstract mechanical problem of interest is the response to RFM point loads of an incompressible medium enclosed in a fluid membrane. Cells are soft systems, susceptible to large deformations in the course of an RFM measurement. Often the local properties such as receptor anchoring forces, the reason for the measurement, are obscu… more
Date: November 15, 2002
Creator: Rudd, Robert E.; McElfresh, Michael; Balhorn, Rod; Allen, Michael J. & Belak, James
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Evaluation of Roof Bolting Requirements Based on In-Mine Bolter Drilling Progress Report

Description: In this quarter, the field, theoretical and programming works have been performed toward achieving the research goals set in the proposal. The main accomplishments in this quarter included: (1) two more sets of field tests have been conducted in an underground coal mine, (2) optimization studies of the control parameters have been conducted, (3) method to use torque to thrust ratio as indicator of rock relative hardness has also been explored, and (3) about 97% of the development work for the r… more
Date: September 15, 2004
Creator: Peng, Syd S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Evaluation of Roof Bolting Requirements Based on In-Mine Bolter Drilling Progress Report

Description: In this quarter, the field, theoretical and programming works have been performed toward achieving the research goals set in the proposal. The main accomplishments in this quarter included: (1) one more field test has been conducted in an underground coal mine, (2) optimization studies of the control parameters have been conducted, (3) the relationship among feed pressure, penetration rate and rotation rate seems to be a good indicator for estimating rock strength when both penetration rate and… more
Date: April 15, 2005
Creator: Peng, Syd S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Evaluation of Roof Bolting Requirements Based on In-Mine Bolter Drilling Progress Report

Description: In this quarter, the field, theoretical and programming works have been performed toward achieving the research goals set in the proposal. The main accomplishments in this quarter included: (1) laboratory tests have been conducted, (2) with the added trendline analysis method, the accuracy of the data interpretation methodology will be improved, (3) method to use torque to thrust ratio as indicator of rock relative hardness has also been explored, and (3) about one half of the development work … more
Date: October 15, 2003
Creator: Peng, Syd S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

CAM operated tool for proximate or remote holding of an object

Description: A tool for releasably holding an object includes a receptacle having an outer sleeve and a rotatable inner sleeve. The inner sleeve is coaxially positioned within the outer sleeve and includes a locking member. An insert which is adapted to be operably associated with the receptacle includes a cam. The cam includes a guide and a slot so that when the cam is inserted into the inner sleeve, the guide aligns the locking member with the slot allowing the locking member to engage the slot thereby ho… more
Date: December 31, 1995
Creator: Schrum, P.B. & Gajdzik, G.P. Jr.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
open access

Bio-functional subwavelength optical waveguides for biodetection

Description: We report a versatile biofunctional subwavelength photonic device platform for real-time detection of biological molecules. Our devices contain lipid bilayer membranes fused onto metal oxide nanowire waveguides stretched across polymeric flow channels. The lipid bilayers incorporating target receptors are submersed in the propagating evanescent field of the optical cavity. We show that the lipid bilayers in our devices are continuous, have very high mobile fraction, and are resistant to fouling… more
Date: July 10, 2007
Creator: Sirbuly, Donald J.; Fischer, Nicholas; Huang, Shih-Chieh; Artyukhin, Alexander; Tok, Jeff & Bakajin, Olgica
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Monitoring the Migrations of Wild Snake River Spring/Summer Chinook Salmon Juveniles, 2007-2008

Description: This report provides results from an ongoing project to monitor the migration behavior and survival of wild juvenile spring/summer Chinook salmon in the Snake River Basin. Data reported is from detections of PIT tagged fish during late summer 2007 through mid-2008. Fish were tagged in summer 2007 by the National Marine Fisheries Service (NMFS) in Idaho and by the Oregon Department of Fish and Wildlife (ODFW) in Oregon. Our analyses include migration behavior and estimated survival of fish at in… more
Date: July 9, 2009
Creator: Achord, Stephen; Sandford, Benjamin P. & Hockersmith, Eric E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Fiber Tracking Cylinder Nesting

Description: The fiber tracker consists of 8 concentric carbon fiber cylinders of varying diameters, from 399mm to 1032.2mm and two different lengths. 1.66 and 2.52 meters. Each completed cylinder is covered over the entire o.d. with scintillating fiber ribbons with a connector on each ribbon. These ribbons are axial (parallel to the beam line) at one end and stereo (at 3 deg. to the beam line) at the other. The ribbon connectors have dowel pins which are used to match with the connectors on the wave guide … more
Date: March 30, 1999
Creator: Stredde, H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Dynamic Analysis of the Bulk Tritium Shipping Package Subjected to Closure Torques and Sequential Impacts

Description: This paper presents a finite-element technique to simulate the structural responses and to evaluate the cumulative damage of a radioactive material packaging requiring bolt closure-tightening torque and subjected to the scenarios of the Hypothetical Accident Conditions (HAC) defined in the Code of Federal Regulations Title 10 part 71 (10CFR71). Existing finite-element methods for modeling closure stresses from bolt pre-load are not readily adaptable to dynamic analyses. The HAC events are requi… more
Date: July 9, 2007
Creator: Wu, T.; Paul Blanton, P. & Kurt Eberl, K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Evaluation of Roof Bolting Requirements Based on In-Mine Bolter Drilling Progress Report

Description: In this quarter, the field, theoretical and programming works have been performed toward achieving the research goals set in the proposal. The main accomplishments in this quarter included: (1) one more field test has been conducted in an underground coal mine, (2) optimization studies of the control parameters have been conducted, (3) method to use torque to thrust ratio as indicator of rock relative hardness has also been explored, and (4) about 98% of the development work for the roof geolog… more
Date: January 15, 2005
Creator: Peng, Syd S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Monitoring the Migrations of Wild Snake River Spring/Summer Chinook Salmon Juveniles, 2007-2008 Report of Research.

Description: This report provides results from an ongoing project to monitor the migration behavior and survival of wild juvenile spring/summer Chinook salmon in the Snake River Basin. Data reported is from detections of PIT tagged fish during late summer 2007 through mid-2008. Fish were tagged in summer 2007 by the National Marine Fisheries Service (NMFS) in Idaho and by the Oregon Department of Fish and Wildlife (ODFW) in Oregon. Our analyses include migration behavior and estimated survival of fish at in… more
Date: May 26, 2009
Creator: Achord, Stephen; Sandford, Benjamin P. & Hockersmith, Eric E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Testing of Compact Bolted Fasteners with Insulation and Friction-Enhanced Shims for NCSX

Description: The fastening of the National Compact Stellarator Experiment's (NCSX) modular coils presented a number of engineering and manufacturing challenges due to the high magnetic forces, need to control induced currents, tight tolerances and restrictive space envelope. A fastening method using high strength studs, jack nuts, insulating spacers, bushings and alumina coated shims was developed which met the requirements. A test program was conducted to verify the design. The tests included measurements … more
Date: February 4, 2009
Creator: L. E. Dudek, J.H. Chrzanowski, G. Gettelfinger, P. Heitzenroeder, S. Jurczynski, M. Viola and K. Freudenberg
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Stability Regimes of Turbulent Nitrogen-Diluted Hydrogen Jet Flames

Description: One option for combustion in zero-emission Integrated Gasification Combined Cycle (IGCC) power plants is non-premixed combustion of nitrogen-diluted hydrogen in air. An important aspect to non-premixed combustion is flame stability or anchoring, though only a few fundamental stability studies of these flames have taken place to date. The following paper presents the results of experiments investigating the effects of nitrogen diluent fraction, jet diameter, and exit velocity on the static stabi… more
Date: March 1, 2007
Creator: Weiland, N. T. & Strakey, P. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Evaluation of Roof Bolting Requirements Based on In-Mine Bolter Drilling Progress Report

Description: In this quarter, the field, theoretical and programming works have been performed toward achieving the research goals set in the proposal. The main accomplishments in this quarter included: (1) laboratory tests have been conducted, (2) with the added trendline analysis method, the accuracy of the data interpretation methodology will be improved and the interfaces and voids can be more reliably detected, (3) method to use torque to thrust ratio as indicator of rock relative hardness has also bee… more
Date: January 15, 2003
Creator: Peng, Syd S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Evaluation of Roof Bolting Requirements Based on In-Mine Bolter Drilling Progress Report

Description: Roof bolting is the most popular method for underground openings in the mining industry, especially in the bedded deposits such as coal, potash, salt etc. In fact, all U.S. underground coal mine entries are roof-bolted as required by law. However, roof falls still occur frequently in the roof bolted entries. The two possible reasons are: the lack of knowledge of and technology to detect the roof geological conditions in advance of mining, and lack of roof bolting design criteria for modern roof… more
Date: April 15, 2002
Creator: Peng, Syd S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Evaluation of Roof Bolting Requirements Based on In-Mine Bolter Drilling Progress Report

Description: Roof bolting is the most popular method for underground openings in the mining industry, especially in the bedded deposits such as coal, potash, salt etc. In fact, all U.S. underground coal mine entries are roof-bolted as required by law. However, roof falls still occur frequently in the roof bolted entries. The two possible reasons are: the lack of knowledge of and technology to detect the roof geological conditions in advance of mining, and lack of roof bolting design criteria for modern roof… more
Date: October 15, 2001
Creator: Peng, Syd S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Evaluation of Roof Bolting Requirements Based on In-Mine Bolter Drilling Progress Report

Description: Roof bolting is the most popular method for underground openings in the mining industry, especially in the bedded deposits such as coal, potash, salt etc. In fact, all U.S. underground coal mine entries are roof-bolted as required by law. However, roof falls still occur frequently in the roof bolted entries. The two possible reasons are: the lack of knowledge of and technology to detect the roof geological conditions in advance of mining, and lack of roof bolting design criteria for modern roof… more
Date: July 15, 2001
Creator: Peng, Syd S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Evaluation of Roof Bolting Requirements Based on In-Mine Bolter Drilling Progress Report

Description: Roof bolting is the most popular method for underground openings in the mining industry, especially in the bedded deposits such as coal, potash, salt etc. In fact, all U.S. underground coal mine entries are roof-bolted as required by law. However, roof falls still occur frequently in the roof bolted entries. The two possible reasons are: the lack of knowledge of and technology to detect the roof geological conditions in advance of mining, and lack of roof bolting design criteria for modern roof… more
Date: January 15, 2002
Creator: Peng, Syd S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Special remote tooling developed and utilized to tighten TFTR TF coil casing bolts

Description: Special tooling has been developed and used to tighten toroidal field (TF) coil casing bolts that have loosened from years of Tokamak Fusion Test Reactor (TFTR) operation. Due to their location, many of the TF casing bolts cannot be directly accessed or viewed; their condition was first discovered during unrelated inspections in 1988. Engineering solutions were, sought until 1992, when a remotely operated wrench concept was successfully demonstrated on a TF coil mockup. The concept was develope… more
Date: October 1, 1993
Creator: Burgess, T. W.; Walton, G. R.; Meighan, T. G. & Paul, B. L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Evaluation of Roof Bolting Requirements Based on In-Mine Bolter Drilling Progress Report

Description: Roof bolting is the most popular method for underground openings in the mining industry, especially in the bedded deposits such as coal, potash, salt etc. In fact, all U.S. underground coal mine entries are roof-bolted as required by law. However, roof falls still occur frequently in the roof bolted entries. The two possible reasons are: the lack of knowledge of and technology to detect the roof geological conditions in advance of mining, and lack of roof bolting design criteria for modern roof… more
Date: October 15, 2002
Creator: Peng, Syd S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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