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Enhancement of Equilibrium Shift in Dehydrogenation Reactions Using a Novel Membrane Reactor Semi-Annual Report
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Higher harmonics of Radial Vibrations in Short Hollow Cylinders of Barium Titanate
This paper discusses the forbidden and allowed harmonics of a hollow cylinder of barium titanate vibrating in the radial mode.
Date:
March 9, 1955
Creator:
Stephenson, C.V.
Object Type:
Report
System:
The UNT Digital Library
Annual Report of the Boy Scouts of America: 1963
Annual report submitted by the Boy Scouts of America to Congress describing highlights from 1963 activities, finance, public relations, honors, service, organizational leadership, and other information about scouting programs.
Date:
March 9, 1964
Creator:
Boy Scouts of America
Object Type:
Report
System:
The Portal to Texas History
The Blast Cleaning Process as an Aid to Visual Weld Inspection
Late in 1958 it became apparent that some fuel elements were failing in the Hanford reactors as a result of water entering through the weld. The mode of entry appeared to be first through a void in the weld, then through a non-wet area or a train of voids in the braze, and finally to the uranium core. Defective closures of a similar nature were also typical of many fuel elements which have failed in the autoclaving operation as shown in Figure 1.
Date:
March 9, 1960
Creator:
Hanson, G. R.
Object Type:
Report
System:
The UNT Digital Library
Photographic Observations of the Growth of Uranium Dioxide Crystals by Vapor Deposition
Photographic observations of the behavior of uranium dioxide at high temperatures are of great value in designing and evaluating fuel elements. This paper reports the growth of uranium dioxide crystals by vapor deposition during out-of-reactor and in-reactor experiments.
Date:
March 9, 1959
Creator:
Bates, J. L. & Newkirk, H. W.
Object Type:
Report
System:
The UNT Digital Library
Simulation of an Electromagnetic Nondestructive Test on an Analog Computer
The purpose of this report is to show the impedance of an approximate equivalent circuit on a complex plan for various constant frequencies and different metals. The equivalent circuit represents a testing coil driven with an AC voltage and a network to represent the impedance of the metal.
Date:
March 9, 1959
Creator:
Cameron, W. D.
Object Type:
Report
System:
The UNT Digital Library
Churn.
Patent for improvements in churns, "specifically a churn disclosed in Patent No. 1268766, L. M. Payne, R. A. Thompson and L. P. Morris, June 4, 1918."
Date:
March 9, 1919
Creator:
Wilson, William W.
Object Type:
Patent
System:
The Portal to Texas History
Bottle-Cap
Patent for Louis Skala's improvement on the bottle cap. This design features a clampable bottlecap design for better functionality and a better seal
Date:
March 9, 1918
Creator:
Skala, Louis
Object Type:
Patent
System:
The Portal to Texas History
CANAL-GATE.
Patent for an improvement to canal-gates that is "a simple and comparatively inexpensive contrivance for receiving a handle of the shank of a handle which is attached to the lock or gate" (lines 18-22) including an illustration.
Date:
March 9, 1920
Creator:
Perry, Charles Franklin
Object Type:
Patent
System:
The Portal to Texas History
Hot-Air Mixer
Patent for a device that will create hot air to be delivered to the manifold of gas-powered engines in motor vehicles when the operator pushes a plunger that will open an intake valve.
Date:
March 9, 1920
Creator:
Ingraham, Jerome H.
Object Type:
Patent
System:
The Portal to Texas History
Hat Shape Retainer and Loss Preventing Device.
Patent, with illustrations, for an apparatus attached to the sweat band of a hat with the purpose of hat loss prevention and maintaining the hat's shape.
Date:
March 9, 1920
Creator:
Huling, Clint Henry
Object Type:
Patent
System:
The Portal to Texas History
Pipe-Tongs
Patent for an improvement on the existing design of pipe tongs, the improvement will allow for one individual to hold the tongs, adjust the size around the pipes, and screw or unscrew the pipe alone. Previous designs required two or three individuals.
Date:
March 9, 1920
Creator:
Hill, Richard Dennie
Object Type:
Patent
System:
The Portal to Texas History
Furnace.
Patent for a furnace capable of burning rice hulls, sawdust, chaff, and more "in connection with the boiler for generating steam and which will entirely consume such products without contaminating the surrounding air with the ashes given off" (lines 31-34).
Date:
March 9, 1920
Creator:
Ewing, William E.
Object Type:
Patent
System:
The Portal to Texas History
Wire-Forming Machine.
Patent for a wire forming machine that takes wire from an intake and automatically forms the wire into clothes pins. This machine also improves the wire feeding mechanism in older models of this type of machine, and it forms a ring that the pins can attach to for the purpose of suspending the pin from a clothes line.
Date:
March 9, 1920
Creator:
Werner, Henry E. & Mitchell, Jordan H.
Object Type:
Patent
System:
The Portal to Texas History
Hydrogeochemical and Stream Sediment Reconnaissance Basic Data for Wichita NTMS Quadrangle, Kansas
This report presents the results of a reconnaissance geochemical survey of the Wichita quadrangle, Kansas. Field laboratory data is provided for 741 groundwater and 765 stream sediment samples.
Date:
March 9, 1979
Creator:
National Uranium Resource Evaluation Program
Object Type:
Report
System:
The UNT Digital Library
Integro-differential equation analysis and radioisotope imaging systems. Research proposal. [Testing of radioisotope imaging system in phantoms]
Design modifications of a five-probe focusing collimator coincidence radioisotope scanning system are described. Clinical applications of the system were tested in phantoms using radioisotopes with short biological half-lives, including /sup 75/Se, /sup 192/Ir, /sup 43/K, /sup 130/I, and /sup 82/Br. Data processing methods are also described. (CH)
Date:
March 9, 1976
Creator:
Hart, H.
Object Type:
Report
System:
The UNT Digital Library
Texas Preventable Disease News, Volume 45, Number 10, March 9, 1985
Newsletter of the Texas Bureau of Disease Control and Epidemiology discussing the news, activities, and events of the organization and other information related to health in Texas.
Date:
March 9, 1985
Creator:
Texas. Bureau of Disease Control and Epidemiology.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Investigating the Affinities and Persistence of VX Nerve Agent in Environmental Matrices
Laboratory experiments were conducted to determine environmental variables that affect the affinities and persistence of the nerve agent O-ethyl S-(2-diisopropylaminoethyl) methylphosphonothiolate (VX) at dilute concentrations in environmental matrices. Quantitative analyses of VX and its degradation products were performed using LC-MS. Batch hydrolysis experiments demonstrated an increasing hydrolysis rate as pH increased, as shown in previous studies, but also indicated that dissolved aqueous constituents can cause significant differences in the absolute hydrolysis rate. Adsorption isotherms from batch aqueous experiments revealed that VX has a high affinity for hydrophobic organics, a moderate affinity for montmorillonite clay, and a very low affinity for an iron-oxyhydroxide soil mineral, goethite. The adsorption on goethite was increased with the presence of dissolved organic matter in solution. VX degraded rapidly when dried onto goethite, when an inner-sphere complex was forced. No enhanced degradation occurred with goethite in small amounts water. These results suggest that aqueous conditions have important controls on VX adsorption and degradation in the environment and a more mechanistic understanding of these controls is needed in order to enable accurate predictions of its long-term fate and persistence.
Date:
March 9, 2004
Creator:
Love, A H; Vance, A L; Reynolds, J G & Davisson, M L
Object Type:
Article
System:
The UNT Digital Library
Normalized Texture Motifs and Their Application to Statistical Object Modeling
A fundamental challenge in applying texture features to statistical object modeling is recognizing differently oriented spatial patterns. Rows of moored boats in remote sensed images of harbors should be consistently labeled regardless of the orientation of the harbors, or of the boats within the harbors. This is not straightforward to do, however, when using anisotropic texture features to characterize the spatial patterns. We here propose an elegant solution, termed normalized texture motifs, that uses a parametric statistical model to characterize the patterns regardless of their orientation. The models are learned in an unsupervised fashion from arbitrarily orientated training samples. The proposed approach is general enough to be used with a large category of orientation-selective texture features.
Date:
March 9, 2004
Creator:
Newsam, S D
Object Type:
Article
System:
The UNT Digital Library
A technique for accelerating the convergence of restarted GMRES
We have observed that the residual vectors at the end of each restart cycle of restarted GMRES often alternate direction in a cyclic fashion, thereby slowing convergence. We present a new technique for accelerating the convergence of restarted GMRES by disrupting this alternating pattern. The new algorithm resembles a full conjugate gradient method with polynomial preconditioning, and its implementation requires minimal changes to the standard restarted GMRES algorithm.
Date:
March 9, 2004
Creator:
Baker, A H; Jessup, E R & Manteuffel, T
Object Type:
Article
System:
The UNT Digital Library
The Effects of Radiation Induced Carbon Contamination on the Performance of an EUV Lithographic Optic
Carbon deposition in EUVL is known to occur when optical surfaces in a hydrocarbon environment are exposed to EUV light. Carbon contamination on EUV optical elements affects both the absorption and phase of the reflected light. Because the carbon deposition alters the phase structure of the reflected EUV light it effectively alters the figure of these optics and, thus, the aberrations as well. Absorption by deposited carbon not only reduces throughput but also leads to apodisation of the pupil, which in turn affects imaging performance.
Date:
March 9, 2003
Creator:
Barty, A. & Goldberg, K.
Object Type:
Article
System:
The UNT Digital Library
Evaluation of Nevada Test Site Ground Motion and Rock Property Data to Bound Ground Motions at the Yucca Mountain Repository
Yucca Mountain licensing will require estimation of ground motions from probabilistic seismic hazard analyses (PSHA) with annual probabilities of exceedance on the order of 10{sup -6} to 10{sup -7} per year or smaller, which correspond to much longer earthquake return periods than most previous PSHA studies. These long return periods for the Yucca Mountain PSHA result in estimates of ground motion that are extremely high ({approx} 10 g) and that are believed to be physically unrealizable. However, there is at present no generally accepted method to bound ground motions either by showing that the physical properties of materials cannot maintain such extreme motions, or the energy release by the source for such large motions is physically impossible. The purpose of this feasibility study is to examine recorded ground motion and rock property data from nuclear explosions to determine its usefulness for studying the ground motion from extreme earthquakes. The premise is that nuclear explosions are an extreme energy density source, and that the recorded ground motion will provide useful information about the limits of ground motion from extreme earthquakes. The data were categorized by the source and rock properties, and evaluated as to what extent non-linearity in the material has …
Date:
March 9, 2005
Creator:
Hutchings, L. H.; Foxall, W.; Rambo, J. & Wagoner, J. L.
Object Type:
Report
System:
The UNT Digital Library
A High Order Mixed Vector Finite Element Method for Solving the Time Dependent Maxwell Equations on Unstructured Grids
We present a mixed vector finite element method for solving the time dependent coupled Ampere and Faraday laws of Maxwell's equations on unstructured hexahedral grids that employs high order discretization in both space and time. The method is of arbitrary order accuracy in space and up to 5th order accurate in time, making it well suited for electrically large problems where grid anisotropy and numerical dispersion have plagued other methods. In addition, the method correctly models both the jump discontinuities and the divergence-free properties of the electric and magnetic fields, is charge and energy conserving, conditionally stable, and free of spurious modes. Several computational experiments are performed to demonstrate the accuracy, efficiency and benefits of the method.
Date:
March 9, 2004
Creator:
Rieben, R. N.; Rodrigue, G. H. & White, D. A.
Object Type:
Article
System:
The UNT Digital Library
Silicon Nanocrystal Laser
The purpose of this feasibility study project was to attempt to demonstrate the silicon-nanocrystal-based laser. Such a silicon laser (made using conventional silicon-manufacturing technologies) would provide the crucial missing link that would enable a completely-silicon-based photonic system. We prepared thin layers of silicon nanocrystal material by ion-implanting Si in fused silica substrates, followed by a high temperature anneal process. These Si nanocrystals produced intense photoluminescence when optically pumped with ultraviolet light. Laser structures based on Fabry-Perot cavity and distributed feedback (DFB) designs were fabricated using the Si nanocrystals as the ''lasing'' medium. We optically pumped the samples with CW lasers at 413nm wavelength to quickly assess the feasibility of making lasers out of the Nanocrystal Si material and to verify the gain coefficients reported by other research groups.
Date:
March 9, 2005
Creator:
Yu, J
Object Type:
Report
System:
The UNT Digital Library
Species Diffusion in ALE3D
ALE3D is a finite element arbitrary Lagrange-Eulerian hydro code with thermal transport and chemical reactions. In order to consider problems of aging a species diffusion capability was added. Species diffusion is the process whereby species move under potential flow from one location in the system to another. The diffusion method needed to work with element-centered concentrations. In order to fit within the ALE3D scheme, the method also needed to work on an arbitrarily connected hexahedral mesh. Since the rate of species diffusion is usually slow compared to other processes, it an explicit method is sufficient. Finally, the method must conserve total species concentration. Three separate finite volume algorithms were developed. These methods share the following characteristics: species fluxes of mass and energy are defined at each face. A second order predictor corrector scheme is used, with the ratio between the corrected mass flux and the predicted mass flux being used to define an accuracy time step constraint. The courant like diffusivity constraint is used for the stability constraint. Examples are shown.
Date:
March 9, 2005
Creator:
Nichols, A. L.
Object Type:
Article
System:
The UNT Digital Library