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246,956 Matching Results

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Best Match Title Creator Date Created (Newest) Date Created (Oldest) Date Added (Newest) Date Added (Oldest)
3-D sedimentological and geophysical studies of clastic reservoir analogs: Facies architecture, reservoir properties, and flow behavior within delta front facies elements of the Cretaceous Wall Creek Member, Frontier Formation, Wyoming (open access)

3-D sedimentological and geophysical studies of clastic reservoir analogs: Facies architecture, reservoir properties, and flow behavior within delta front facies elements of the Cretaceous Wall Creek Member, Frontier Formation, Wyoming

None
Date: February 16, 2007
Creator: Bhattacharya, Janok P. & McMechan, George A.
Object Type: Report
System: The UNT Digital Library
3-D Seismic Imaging of Complex Geologies (open access)

3-D Seismic Imaging of Complex Geologies

We present three codes for the Intel Paragon that address the problem of three-dimensional seismic imaging of complex geologies. The first code models acoustic wave propagation and can be used to generate data sets to calibrate and validate seismic imaging codes. This code reported the fastest timings for acoustic wave propagation codes at a recent SEG (Society of Exploration Geophysicists) meeting. The second code implements a Kirchhoff method for pre-stack depth migration. Development of this code is almost complete, and preliminary results are presented. The third code implements a wave equation approach to seismic migration and is a Paragon implementation of a code from the ARCO Seismic Benchmark Suite.
Date: February 1, 1995
Creator: Womble, David E.; Dosanjh, Sudip S.; VanDyke, John P.; Oldfield, Ron A. & Greenberg, David S.
Object Type: Article
System: The UNT Digital Library
3-D slug flow heat transfer analysis of coupled coolant cells in finite LMFBR bundles (open access)

3-D slug flow heat transfer analysis of coupled coolant cells in finite LMFBR bundles

A three-dimensional single region slug flow heat transfer analysis for finite LMFBR rod bundles using a classical analytical solution method has been performed. According to the isolated single cell analysis, the results show that the peripheral clad temperature variation as well as the thermal entrance length are strongly dependent upon the degree of irregularity displayed by various coolant geometries. Since under the present LMFBR conditions, fully-developed temperature fields may hardly be established in such characteristic rod bundle regions, a 3-D heat transfer analysis seems to be mandatory. This implies that the results of fully developed heat transfer analyses are by far too conservative.
Date: February 1, 1978
Creator: Wong, C.N. & Wolf, L.
Object Type: Report
System: The UNT Digital Library
A 3-dimensional ray-trace model for predicting the performance of flashlamp-pumped laser amplifiers (open access)

A 3-dimensional ray-trace model for predicting the performance of flashlamp-pumped laser amplifiers

We have developed a fully three-dimensional model for the performance of flashlamp pumped laser amplifiers. The model uses a reverse ray-trace technique to calculate the pumping of the laser glass by the flashlamp radiation. We have discovered several different methods by which we can speed up the calculation of the gain profile in a amplifier. The model predicts the energy-storage performance of the Beamlet amplifiers to better than 5%. This model will be used in the optimization of the National Ignition Facility (NIF) amplifier design.
Date: February 13, 1997
Creator: Jancaitis, K.S.; Haney, S.W.; Munro, D.H.; Le Touze, G. & Cabourdin, O.
Object Type: Article
System: The UNT Digital Library
T-3 electron-beam-excited laser system (open access)

T-3 electron-beam-excited laser system

A laser system specifically designed to study the kinetics of electron-beam driven systems is described. Details of the system are given along with measurements of the electron-beam uniformity and deposition in the laser medium. Some HF laser results obtained with this system are also given.
Date: February 1, 1981
Creator: Klein, R. A.
Object Type: Report
System: The UNT Digital Library
3(omega) Damage: Growth Mitigation (open access)

3(omega) Damage: Growth Mitigation

The design of high power UV laser systems is limited to a large extent by the laser-initiated damage performance of transmissive fused silica optical components. The 3{omega} (i.e., the third harmonic of the primary laser frequency) damage growth mitigation LDRD effort focused on understanding and reducing the rapid growth of laser-initiated surface damage on fused silica optics. Laser-initiated damage can be discussed in terms of two key issues: damage initiated at some type of precursor and rapid damage growth of the damage due to subsequent laser pulses. The objective of the LDRD effort has been the elucidation of laser-induced damage processes in order to quantify and potentially reduce the risk of damage to fused silica surfaces. The emphasis of the first two years of this effort was the characterization and reduction of damage initiation. In spite of significant reductions in the density of damage sites on polished surfaces, statistically some amount of damage initiation should always be expected. The early effort therefore emphasized the development of testing techniques that quantified the statistical nature of damage initiation on optical surfaces. This work led to the development of an optics lifetime modeling strategy that has been adopted by the NIF project to …
Date: February 22, 2001
Creator: Kozlowski, M; Demos, S; Wu, Z-L; Wong, J; Penetrante, B & Hrubesh, L
Object Type: Report
System: The UNT Digital Library
4.5" heavy pressure valve

4.5" heavy pressure valve

Blueprint depicting technical details of Battleship Texas.
Date: February 13, 1914
Creator: unknown
Object Type: Technical Drawing
System: The Portal to Texas History
[-4 and 10 measurements]

[-4 and 10 measurements]

Photograph of measurements for a transmitter scope ranging from -4 to +10.
Date: February 21, 1973
Creator: WBAP-TV (Television station : Fort Worth, Tex.)
Object Type: Photograph
System: The UNT Digital Library
The 4-County News Bulletin (Castroville, Tex.), Vol. 19, No. 44, Ed. 1 Monday, February 6, 1978 (open access)

The 4-County News Bulletin (Castroville, Tex.), Vol. 19, No. 44, Ed. 1 Monday, February 6, 1978

Weekly newspaper from Castroville, Texas that includes local, state, and national news along with extensive advertising.
Date: February 6, 1978
Creator: Schott, Bobbie
Object Type: Newspaper
System: The Portal to Texas History
The 4-County News Bulletin (Castroville, Tex.), Vol. 19, No. 45, Ed. 1 Monday, February 13, 1978 (open access)

The 4-County News Bulletin (Castroville, Tex.), Vol. 19, No. 45, Ed. 1 Monday, February 13, 1978

Weekly newspaper from Castroville, Texas that includes local, state, and national news along with extensive advertising.
Date: February 13, 1978
Creator: Schott, Bobbie
Object Type: Newspaper
System: The Portal to Texas History
The 4-County News Bulletin (Castroville, Tex.), Vol. 19, No. 46, Ed. 1 Monday, February 20, 1978 (open access)

The 4-County News Bulletin (Castroville, Tex.), Vol. 19, No. 46, Ed. 1 Monday, February 20, 1978

Weekly newspaper from Castroville, Texas that includes local, state, and national news along with extensive advertising.
Date: February 20, 1978
Creator: Schott, Bobbie
Object Type: Newspaper
System: The Portal to Texas History
The 4-County News Bulletin (Castroville, Tex.), Vol. 19, No. 47, Ed. 1 Monday, February 27, 1978 (open access)

The 4-County News Bulletin (Castroville, Tex.), Vol. 19, No. 47, Ed. 1 Monday, February 27, 1978

Weekly newspaper from Castroville, Texas that includes local, state, and national news along with extensive advertising.
Date: February 27, 1978
Creator: Schott, Bobbie
Object Type: Newspaper
System: The Portal to Texas History
04-ERD-052-Final Report (open access)

04-ERD-052-Final Report

Generating the sequence of the human genome represents a colossal achievement for science and mankind. The technical use for the human genome project information holds great promise to cure disease, prevent bioterror threats, as well as to learn about human origins. Yet converting the sequence data into biological meaningful information has not been immediately obvious, and we are still in the preliminary stages of understanding how the genome is organized, what are the functional building blocks and how do these sequences mediate complex biological processes. The overarching goal of this program was to develop novel methods and high throughput strategies for determining the functions of ''anonymous'' human genes that are evolutionarily deeply conserved in other vertebrates. We coupled analytical tool development and computational predictions regarding gene function with novel high throughput experimental strategies and tested biological predictions in the laboratory. The tools required for comparative genomic data-mining are fundamentally the same whether they are applied to scientific studies of related microbes or the search for functions of novel human genes. For this reason the tools, conceptual framework and the coupled informatics-experimental biology paradigm we developed in this LDRD has many potential scientific applications relevant to LLNL multidisciplinary research in bio-defense, …
Date: February 26, 2007
Creator: Loots, G. G.; Ovcharenko, I.; Collette, N.; Babu, P.; Chang, J.; Stubbs, L. et al.
Object Type: Report
System: The UNT Digital Library
[4-H Members]

[4-H Members]

Photograph of a girl sitting at a desk and reading a book with the 4-H logo on the cover, and a boy standing behind her looking over her shoulder.
Date: February 1958
Creator: unknown
Object Type: Photograph
System: The Portal to Texas History
4 K to 20 K Rotational-Cooling Magnetic Refrigerator Capable of 1-Mw to >1-W Operation (open access)

4 K to 20 K Rotational-Cooling Magnetic Refrigerator Capable of 1-Mw to >1-W Operation

The low-temperature, magnetic entropy of certain single-crystal paramagnetic materials, such as DyPO/sub 4/, changes dramatically as the crystal rotates in a magnetic field. A new magnetic refrigerator design based on the anisotropic nature of such materials is presented. The key advantages of the rotational-cooling concept are (1) a single, rotary motion is required, (2) magnetic field shaping is not a problem because the entire working material is in a constant field, and (3) the refrigerator can be smaller than comparable magnetic refrigerators because the working material is entirely inside the magnet at all times. The main disadvantage of the rotational-cooling concept is that small-dimension single crystals are required.
Date: February 1, 1980
Creator: Barclay, J. A.
Object Type: Report
System: The UNT Digital Library
N >= 4 Supergravity Amplitudes from Gauge Theory at Two Loops (open access)

N >= 4 Supergravity Amplitudes from Gauge Theory at Two Loops

We present the full two-loop four-graviton amplitudes in N = 4, 5, 6 supergravity. These results were obtained using the double-copy structure of gravity, which follows from the recently conjectured color-kinematics duality in gauge theory. The two-loop four-gluon scattering amplitudes in N = 0, 1, 2 supersymmetric gauge theory are a second essential ingredient. The gravity amplitudes have the expected infrared behavior: the two-loop divergences are given in terms of the squares of the corresponding one-loop amplitudes. The finite remainders are presented in a compact form. The finite remainder for N = 8 supergravity is also presented, in a form that utilizes a pure function with a very simple symbol.
Date: February 15, 2012
Creator: Boucher-Veronneau, C. & Dixon, L. J.
Object Type: Article
System: The UNT Digital Library
5 1/2" Heavy Pressure Valve, Cast Steel (5 1/2" Dynamo Steam Stop)

5 1/2" Heavy Pressure Valve, Cast Steel (5 1/2" Dynamo Steam Stop)

Blueprint depicting technical details of Battleship Texas.
Date: February 4, 1913
Creator: unknown
Object Type: Technical Drawing
System: The Portal to Texas History
5.5" low pressure valve

5.5" low pressure valve

Blueprint depicting technical details of Battleship Texas.
Date: February 3, 1914
Creator: unknown
Object Type: Technical Drawing
System: The Portal to Texas History
5.5" low pressure valve

5.5" low pressure valve

Blueprint depicting technical details of Battleship Texas.
Date: February 3, 1914
Creator: unknown
Object Type: Technical Drawing
System: The Portal to Texas History
5-cm, no iron SSC 6-m dipole test program (open access)

5-cm, no iron SSC 6-m dipole test program

Magnet Design B for the Superconducting Super Collider (SSC) consists of a 5 cm diameter collared coil assembly 12 m long with concentric aluminum thermal shields at 10 K and 80 K, a G-10 post type support system and a minimal iron vacuum vessel located at a large radius from the coil. In order to determine the behavior of such a magnet under both direct current and quenching conditions, a 6 m model was built using Tevatron tooling to produce a 7.6 cm diameter coil. The dc operation demonstrated that the post type suspension has acceptable rigidity. Distortions in the aluminum thermal shield during quench resulted from stresses in the material below the yield values. Temperature increases in the thermal shield due to eddy currents were larger than those calculated using simple assumptions, demonstrating the value of using a model to verify eddy current behavior in complex situations.
Date: February 1, 1986
Creator: Mazur, P. O.; Carson, J. A.; Engler, N. H.; Fisk, H. E.; Gonczy, J. D.; Hanft, R. W. et al.
Object Type: Article
System: The UNT Digital Library
E-5 E-One (2-5-1992)

E-5 E-One (2-5-1992)

None
Date: February 5, 1992
Creator: unknown
Object Type: Photograph
System: The Gateway to Oklahoma History
(6)Li, (7)Li Nuclear Magnetic Resonance Investigation of Lithium Coordination in Binary Phosphate Glasses (open access)

(6)Li, (7)Li Nuclear Magnetic Resonance Investigation of Lithium Coordination in Binary Phosphate Glasses

{sup 6}Li and {sup 7}Li solid state magic angle spinning (MAS) nuclear magnetic resonance (NMR) spectroscopy has been used to investigate the local coordination environment of lithium in a series of xLi{sub 2}O {center_dot} (1-x)P{sub 2}O{sub 5} glasses, where 0.05 {le} x {le} 0.55. Both the {sup 6}Li and {sup 7}Li show chemical shift variations with changes in the Li{sub 2}O concentration, but the observed {sup 6}Li NMR chemical shifts closely approximate the true isotropic chemical shift and can provide a measure of the lithium bonding environment. The {sup 6}Li NMR results indicate that in this series of lithium phosphate glasses the Li atoms have an average coordination between four and five. The results for the metaphosphate glass agree with the coordination number and range of chemical shifts observed for crystalline LiPO{sub 3}. An increase in the {sup 6}Li NMR chemical shift with increasing Li{sub 2}O content was observed for the entire concentration range investigated, correlating with increased cross-linking of the phosphate tetrahedral network by O-Li-O bridges. The {sup 6}Li chemical shifts were also observed to vary monotonically through the anomalous glass transition temperature (T{sub g}) minimum. This continuous chemical shift variation shows that abrupt changes in the Li coordination …
Date: February 8, 1999
Creator: Alam, T.M.; Boyle, T.J.; Brow, R.K. & Conzone, S.
Object Type: Article
System: The UNT Digital Library
7 questions to ask when you buy or sell shelled corn by grade. (open access)

7 questions to ask when you buy or sell shelled corn by grade.

An explanation of corn grade requirements. Factors include insects, odors, moisture, weight-per-bushel, cleanliness, damaged kernels, and color.
Date: February 1952
Creator: United States. Extension Service.
Object Type: Book
System: The UNT Digital Library
[7 Seas advertising]

[7 Seas advertising]

Photograph of a slide displaying jars of 7 Seas products in front of a backdrop. The painted backdrop features trees, a ship, and a building. A light stand can be seen to the right of the image. To the far right, a man's back is facing the camera.
Date: February 1, 1951
Creator: WBAP-TV (Television station : Fort Worth, Tex.)
Object Type: Photograph
System: The UNT Digital Library