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264,824 Matching Results

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Results: 1 - 24 of 264,824 next
Best Match Title Creator Date Created (Newest) Date Created (Oldest) Date Added (Newest) Date Added (Oldest)
0.7-eV GaInAs Junction for a GaInP/GaAs/GaInAs(1-eV)/GaInAs(0.7-eV) Four-Junction Solar Cell: Preprint (open access)

0.7-eV GaInAs Junction for a GaInP/GaAs/GaInAs(1-eV)/GaInAs(0.7-eV) Four-Junction Solar Cell: Preprint

We discuss recent developments in III-V multijunction solar cells, focusing on adding a fourth junction to the Ga0.5In0.5P/GaAs/Ga0.75In0.25As inverted three-junction cell. This cell, grown inverted on GaAs so that the lattice-mismatched Ga0.75In0.25As third junction is the last one grown, has demonstrated 38% efficiency, and 40% is likely in the near future. To achieve still further gains, a lower-bandgap GaxIn1-xAs fourth junction could be added to the three-junction structure for a four-junction cell whose efficiency could exceed 45% under concentration. Here, we present the initial development of the GaxIn1-xAs fourth junction. Junctions of various bandgaps ranging from 0.88 to 0.73 eV were grown, in order to study the effect of the different amounts of lattice mismatch. At a bandgap of 0.88 eV, junctions were obtained with very encouraging {approx}80% quantum efficiency, 57% fill factor, and 0.36 eV open-circuit voltage. The device performance degrades with decreasing bandgap (i.e., increasing lattice mismatch). We model the four-junction device efficiency vs. fourth junction bandgap to show that an 0.7-eV fourth-junction bandgap, while optimal if it could be achieved in practice, is not necessary; an 0.9-eV bandgap would still permit significant gains in multijunction cell efficiency while being easier to achieve than the lower-bandgap junction.
Date: May 1, 2006
Creator: Friedman, D. J.; Geisz, J. F.; Norman, A. G.; Wanlass, M. W. & Kurtz, S. R.
Object Type: Article
System: The UNT Digital Library
The 0.22 Percent Across-the-Board Cut in FY2001 Appropriations (open access)

The 0.22 Percent Across-the-Board Cut in FY2001 Appropriations

Report describing changes that affected the government budget for the 2001 fiscal year under the Consolidated Appropriations Act.
Date: May 31, 2001
Creator: Keith, Robert
Object Type: Report
System: The UNT Digital Library
1,000 Gal Lubricating Oil Tanks Forward Side Bulkhead 104 - Port & Starboard Engine Rooms - Structure Details & Foundation

1,000 Gal Lubricating Oil Tanks Forward Side Bulkhead 104 - Port & Starboard Engine Rooms - Structure Details & Foundation

Blueprint depicting technical details of Battleship Texas.
Date: May 6, 1935
Creator: unknown
Object Type: Technical Drawing
System: The Portal to Texas History
1,2- Hydroxypyridonates as Contrast Agents for Magnetic ResonanceImaging: TREN-1,2-HOPO (open access)

1,2- Hydroxypyridonates as Contrast Agents for Magnetic ResonanceImaging: TREN-1,2-HOPO

1,2-Hydroxypyridinones (1,2-HOPO) form very stable lanthanide complexes that may be useful as contrast agents for Magnetic Resonance Imaging (MRI). X-ray diffraction of single crystals established that the solid state structures of the Eu(III) and the previously reported [Inorg. Chem. 2004, 43, 5452] Gd(III) complex are identical. The recently discovered sensitizing properties of 1,2-HOPO chelates for Eu(III) luminescence allow direct measurement of the number if water molecules in the metal complex. Fluorescence measurements of the Eu(III) complex corroborate that in solution two water molecules coordinate the lanthanide (q = 2) as proposed from the analysis of NMRD profiles. In addition, fluorescence measurements have verified the anion binding interactions of lanthanide TREN-1,2-HOPO complexes in solution, studied by relaxivity, revealing only very weak oxalate binding (K{sub A} = 82.7 {+-} 6.5 M{sup -1}). Solution thermodynamic studies of the metal complex and free ligand have been carried out using potentiometry, spectrophotometry and fluorescence spectroscopy. The metal ion selectivity of TREN-1,2-HOPO supports the feasibility of using 1,2-HOPO ligands for selective lanthanide binding [pGd = 19.3 (2); pZn = 15.2 (2), pCa = 8.8 (3)].
Date: May 8, 2007
Creator: Jocher, Christoph J.; Moore, Evan G.; Xu, Jide; Avedano, Stefano; Botta, Mauro; Aime, Silvio et al.
Object Type: Article
System: The UNT Digital Library
E-1 (5-6-20)

E-1 (5-6-20)

None
Date: May 6, 2020
Creator: unknown
Object Type: Photograph
System: The Gateway to Oklahoma History
E-1 (5-8-18)

E-1 (5-8-18)

Photograph of Dickson FD Engine 1. Photo taken behind Ardmore FD HQ station.
Date: May 8, 2018
Creator: unknown
Object Type: Photograph
System: The Gateway to Oklahoma History
E-1 (5-10-21)

E-1 (5-10-21)

Photograph of MFD E-1, a 1990 Pierce pumper.
Date: May 10, 2021
Creator: unknown
Object Type: Photograph
System: The Gateway to Oklahoma History
E-1 (5-14-15)

E-1 (5-14-15)

Photograph of Erick FD Engine 1. Photo taken at the Western Technology Center in Elk City.
Date: May 14, 2015
Creator: unknown
Object Type: Photograph
System: The Gateway to Oklahoma History
E-1 (5-14-18)

E-1 (5-14-18)

Photograph of Bethany E-1 in front of the station.
Date: May 14, 2018
Creator: unknown
Object Type: Photograph
System: The Gateway to Oklahoma History
A 1.5 GeV compact light source with superconducting bending magnets (open access)

A 1.5 GeV compact light source with superconducting bending magnets

This paper describes the design of a compact electron synchrotron light source for producing X-rays for medical imaging, protein crystallography, nano-machining and other uses up to 35 keV. The source will provide synchrotron light from six 6.9 tesla superconducting 60{degree} bending magnet stations. In addition the ring, contains conventional quadrupoles and sextupoles. The light source has a circumference of 26 meters, which permits it to be located in a variety of industrial and medical facilities.
Date: May 1995
Creator: Garren, A. A.; Cline, D. B.; Kolonko, J. J.; Green, M. A.; Johnson, D. E.; Leung, E. M. et al.
Object Type: Article
System: The UNT Digital Library
1.5" heavy pressure valve

1.5" heavy pressure valve

Blueprint depicting technical details of Battleship Texas.
Date: May 9, 1912
Creator: unknown
Object Type: Technical Drawing
System: The Portal to Texas History
1.5" IPS (2" Bore) Master High Pressure Quick Closing Gate Valve - Fuel Oil System

1.5" IPS (2" Bore) Master High Pressure Quick Closing Gate Valve - Fuel Oil System

Blueprint depicting technical details of Battleship Texas.
Date: May 7, 1935
Creator: unknown
Object Type: Technical Drawing
System: The Portal to Texas History
A 1.8 Mev K+ injector for the high current beam transport experiment fusion (open access)

A 1.8 Mev K+ injector for the high current beam transport experiment fusion

For the High Current Beam Transport Experiment (HCX) at LBNL, an injector is required to deliver up to 1.8 MV of 0.6 A K{sup +} beam with an emittance of {approx}1 p-mm-mrad. We have successfully operated a 10-cm diameter surface ionization source together with an electrostatic quadrupole (ESQ) accelerator to meet these requirements. The pulse length is {approx}4 {micro}s, firing at once every 10-15 seconds. By optimizing the extraction diode and the ESQ voltages, we have obtained an output beam with good current density uniformity, except for a small increase near the beam edge. Characterization of the beam emerging from the injector included measurements of the intensity profile, beam imaging, and transverse phase space. These data along with comparison to computer simulations provide the knowledge base for designing and understanding future HCX experiments.
Date: May 20, 2002
Creator: Kwan, J. W.; Bieniosek, F. M.; Henestroza, E.; Prost, L. & Seidl, P.
Object Type: Article
System: The UNT Digital Library
E-1 1989 E-One (5-1-21)

E-1 1989 E-One (5-1-21)

Photograph of Grady County FD Engine 1, a 1989 E-One pumper. This truck is housed at the Bradley station.
Date: May 1, 2021
Creator: unknown
Object Type: Photograph
System: The Gateway to Oklahoma History
1-Benzyl-3,5-bis(4-chlorobenzylidene)-piperidin-4-one (open access)

1-Benzyl-3,5-bis(4-chlorobenzylidene)-piperidin-4-one

The title compound, C₂₆H₂₁Cl₂NO, crystallizes with two symmetry-independent molecules in the asymmetric unit.
Date: May 16, 2011
Creator: Nesterov, Volodymyr V.; Sarkisov, Sergey S.; Shulaev, Vladimir & Nesterov, Vladimir N.
Object Type: Article
System: The UNT Digital Library
E-1 Ford-ALF (5-27-16)

E-1 Ford-ALF (5-27-16)

Photograph of Deer Creek FD (Grant County, OK) Engine -1. This is a Ford-American LaFrance rig. Photo taken in Medford, OK.
Date: May 27, 2016
Creator: unknown
Object Type: Photograph
System: The Gateway to Oklahoma History
1 GeV CW nonscaling FFAG for ADS, and magnet parameters (open access)

1 GeV CW nonscaling FFAG for ADS, and magnet parameters

Multi-MW proton driver capability remains a challenging, critical technology for many core HEP programs, particularly the neutrino ones such as the Muon Collider and Neutrino factory, and for high-profile energy applications such as Accelerator Driven Subcritical Reactors (ADS) and Accelerator Transmutation of Waste for nuclear power and waste management. Work is focused almost exclusively on an SRF linac, as, to date, no re-circulating accelerator can attain the 10-20 MW capability necessary for the nuclear applications. Recently, the concept of isochronous orbits has been explored and developed for nonscaling FFAGs using powerful new methodologies in FFAG accelerator design. Work is progressing on a stable, high-intensity, 1 GeV isochronous FFAG. Initial specifications of novel magnets with the nonlinear radial fields required to support isochronous operation are also reported here.
Date: May 20, 2012
Creator: Johnstone, C.; Meot, F.; Snopok, P. & Weng, W.
Object Type: Article
System: The UNT Digital Library
1" light and heavy pressure valve

1" light and heavy pressure valve

Blueprint depicting technical details of Battleship Texas.
Date: May 4, 1912
Creator: unknown
Object Type: Technical Drawing
System: The Portal to Texas History
1" light and heavy pressure valve

1" light and heavy pressure valve

Blueprint depicting technical details of Battleship Texas.
Date: May 4, 1912
Creator: unknown
Object Type: Technical Drawing
System: The Portal to Texas History
1-MeV-Electron Irradiation of GaInAsN Cells: Preprint (open access)

1-MeV-Electron Irradiation of GaInAsN Cells: Preprint

This conference paper describes the GaInAsN cells that are measured to retain 933% and 894% of their original efficiency after exposure to 5 X 1014 and 1 X 1015 cm-2 1-MeV electrons, respectively. The rate of degradation is not correlated with the performance at beginning of life (BOL). The depletion width remains essentially unchanged, increasing by< 1%. Temperature-coefficient data for GaInAsN cells are also presented. These numbers are used to project the efficiency of GaInAsN-containing multijunction cells. The GaInAsN junction is not currently predicted to increase the efficiencies of the multijunction cells. Nevertheless, GaInAsN-containing multijunction cell efficiencies are predicted to be comparable to those of the conventional structures, and even small improvements in the GaInAsN cell may lead to higher multijunction cell efficiencies, especially for high-radiation applications and when cell operating temperature is low.
Date: May 1, 2002
Creator: Kurtz, Sarah; King, R. R.; Edmondson, K. M.; Friedman, D. J. & Karam, N. H.
Object Type: Article
System: The UNT Digital Library
1 mil gold bond wire study. (open access)

1 mil gold bond wire study.

In microcircuit fabrication, the diameter and length of a bond wire have been shown to both affect the current versus fusing time ratio of a bond wire as well as the gap length of the fused wire. This study investigated the impact of current level on the time-to-open and gap length of 1 mil by 60 mil gold bond wires. During the experiments, constant current was provided for a control set of bond wires for 250ms, 410ms and until the wire fused; non-destructively pull-tested wires for 250ms; and notched wires. The key findings were that as the current increases, the gap length increases and 73% of the bond wires will fuse at 1.8A, and 100% of the wires fuse at 1.9A within 60ms. Due to the limited scope of experiments and limited data analyzed, further investigation is encouraged to confirm these observations.
Date: May 1, 2013
Creator: Huff, Johnathon; McLean, Michael B.; Jenkins, Mark W. & Rutherford, Brian Milne
Object Type: Report
System: The UNT Digital Library
L-1 Pierce (5-8-21)

L-1 Pierce (5-8-21)

Photograph of MFD Ladder 1, a 2020 Pierce Velocity. 2000 gpm pump, 300 gallon tank, and a 100' midship-mounted platform ladder.
Date: May 8, 2021
Creator: unknown
Object Type: Photograph
System: The Gateway to Oklahoma History
E-1 pump test (5-1-18)

E-1 pump test (5-1-18)

Photograph of Elk City FD E-1 during a pump test in Ackley Park.
Date: May 1, 2018
Creator: unknown
Object Type: Photograph
System: The Gateway to Oklahoma History
E-1 (Quality) (5-4-18)

E-1 (Quality) (5-4-18)

None
Date: May 4, 2018
Creator: unknown
Object Type: Photograph
System: The Gateway to Oklahoma History