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Engineering evaluation of the proposed boiler addition for Minnegasco Energy Center, Minneapolis, Minnesota. Final draft report
The results are reported of a technical evaluation of alternate fuels for the proposed oil and natural gas fired No. 3 boiler at the Minnegasco Energy Center (MEC) located in Minneapolis, Minnesota. This report has been prepared for the Department of Energy, Office of Fuels Conversion for their use in considering an alternate fuel exemption petition submitted by MEC. The fuels considered for the proposed boiler include oil, natural gas, bituminous coal, petroleum coke/coal mixture, refuse-derived fuel (RDF), coal-oil mixtures, and coal/oil dual fuel fired. The purchase of steam from the Northern States Power Company (NSPCo) was also considered as an alternative to construction of another boiler at MEC. Evaluation of each fuel included review of the overall plant design, estimates of capital and O and M costs, salvage value, useful life, and quantities of solid waste produced. The MEC supplies steam and chilled water to the downtown Minneapolis area for building heating and cooling using two presently owned and operated 200,000 lb/h oil/natural gas fired boilers. If the proposed boiler is permitted to burn oil and natural gas, it will be identical in design to the existing boilers. The evaluation showed that the use of oil, natural gas, coal, …
Date:
March 16, 1981
Creator:
Abendroth, H.R. & Poon, A.
Object Type:
Report
System:
The UNT Digital Library
Growth and Fabrication of GaN/AlGaN Heterojunction Bipolar Transistor
A GaN/AlGaN heterojunction bipolar transistor structure with Mg doping in the base and Si Doping in the emitter and collector regions was grown by Metal Organic Chemical Vapor Deposition in c-axis Al(2)O(3). Secondary Ion Mass Spectrometry measurements showed no increase in the O concentration (2-3x10(18) cm(-3)) in the AlGaN emitter and fairly low levels of C (~4-5x10(17) cm (-3)) throughout the structure. Due to the non-ohmic behavior of the base contact at room temperature, the current gain of large area (~90 um diameter) devices was <3. Increasing the device operating temperature led to higher ionization fractions of the mg acceptors in the base, and current gains of ~10 were obtained at 300 degree C.
Date:
March 16, 1999
Creator:
Abernathy, C. R.; Baca, A. G.; Cao, X. A.; Cho, H.; Dang, G. T.; Donovan, S. M. et al.
Object Type:
Article
System:
The UNT Digital Library
Nozzle.
Patent for a hose nozzle with increased capacity and efficiency. Includes instructions and illustrations.
Date:
March 16, 1897
Creator:
Adams, Don B.
Object Type:
Patent
System:
The Portal to Texas History
International Symposium on Systems and Human Science - SSR2005
None
Date:
March 16, 2005
Creator:
Addison, K J
Object Type:
Article
System:
The UNT Digital Library
Noise Performance Evaluation of the Candidate Digitizers for the MAJORANA DEMONSTRATOR
The noise performance evaluation of the two digitizer cards being considered for the MAJORANA DEMONSTRATOR (MJD) is presented in this document. The procurement of the data acquisition electronics for the MJD is scheduled to happen this year. At the time of writing this document, there are two candidate digitizer electronic boards. One aspect that is being considered by the collaboration is the feasibility of using the MJD for dark matter searches. The feasibility of using the MJD for this application is going to be dictated by the ability of the demonstrator to reach sub-keV energy resolution. One of the potential sources of noise in the MJD is the data acquisition system. This document will is concluded with a recommendation for the final digitizer board by comparing the noise performance of the two electronics systems. Noise parameters such as the effective number of bits, input range linearity and signal to noise ratio are experimentally determined. The two digitizer cards feature different on-board digital signal processing and these features are compared. The experimental set-up was also used to identify sources of noise. This paper describes these sources of noise in the data acquisition system, along with mitigation strategies. Issues such as grounding …
Date:
March 16, 2011
Creator:
Aguayo Navarrete, Estanislao
Object Type:
Report
System:
The UNT Digital Library
Broom or Brush
Patent for metal brooms or brushes that are "strong and durable, relatively light in weight, and can be inexpensively manufactured" (line 13-15). It is intended for "sweeping snow, mud, slush, and the like" (line 16-17). The patent can also be applied for smaller version of metal brooms or brushes for other purposes.
Date:
March 16, 1915
Creator:
Airhart, Noah S.
Object Type:
Patent
System:
The Portal to Texas History
HAPs-Rx: Precombustion Removal of Hazardous Air Pollutant Precursors
CQ Inc. and its project team members--Howard University, PrepTech Inc., Fossil Fuel Sciences, the United States Geological Survey (USGS), and industry advisors--are applying mature coal cleaning and scientific principles to the new purpose of removing potentially hazardous air pollutants from coal. The team uniquely combines mineral processing, chemical engineering, and geochemical expertise. This project meets more than 11 goals of the U.S. Department of Energy (DOE), the National Energy Strategy, and the 1993 Climate Change Action Plan. During this project: (1) Equations were developed to predict the concentration of trace elements in as-mined and cleaned coals. These equations, which address both conventional and advanced cleaning processes, can be used to increase the removal of hazardous air pollutant precursors (HAPs) by existing cleaning plants and to improve the design of new cleaning plants. (2) A promising chemical method of removing mercury and other HAPs was developed. At bench-scale, mercury reductions of over 50 percent were achieved on coal that had already been cleaned by froth flotation. The processing cost of this technology is projected to be less than $3.00 per ton ($3.30 per tonne). (3) Projections were made of the average trace element concentration in cleaning plant solid waste streams from …
Date:
March 16, 1998
Creator:
Akers, David J. & Raleigh, Clifford E.
Object Type:
Report
System:
The UNT Digital Library
Quantum Well Width Dependence of Threshold Current Density in InGaN Lasers
The quantum confined Stark effect was found to result in a strong quantum well width dependence of threshold current density in strained group-III nitride quantum well lasers. For an In{sub 0.2}Ga{sub 0.8}N/GaN structure with quantum well width in the neighborhood of 3.5nm, our analysis shows that the reduction in spontaneous emission loss by the electron-hole spatial separation outweighs the corresponding reduction in gain to produce a threshold current density minimum.
Date:
March 16, 1999
Creator:
Amano, H.; Chow, W.W.; Han, J. & Takeuchi, T.
Object Type:
Article
System:
The UNT Digital Library
Fire-Alarm System.
Patent for "an alarm system consisting of an electric circuit within which as thermally operated circuit closer was placed, which was adapted to sound an alarm when the circuit closer had been closed by an operation of the thermal elements of the circuit closer." (lines 78-84) including instructions and illustrations.
Date:
March 16, 1915
Creator:
Ammons, John B.
Object Type:
Patent
System:
The Portal to Texas History
Automatic Fire-Alarm System.
Patent for an automatic fire alarm system with a simple arrangement of alarm devices (positioned throughout different rooms) with sound or visual indicators for fire awareness and closer thermal circuits (assisted with spring contact and circuit closer). The automatic fire alarm system will have a more immediate reaction by making an alert noise or visual and propping open the spring contact.
Date:
March 16, 1915
Creator:
Ammons, John Burck; Ammons, Evander & McGaffey, Otis
Object Type:
Patent
System:
The Portal to Texas History
Heater for Gaseous Fluids.
Patent for "an attachment for use in connection with internal combustion engines whereby heavy oil...may be advantageously used as fuel" (lines 9-12) including instructions and illustrations.
Date:
March 16, 1915
Creator:
Anderau, Joseph Engelbert
Object Type:
Patent
System:
The Portal to Texas History
Terrorist Attacks in Europe and Mounting Security Concerns
This report briefly discusses the European policy response to recent terrorist attacks.
Date:
March 16, 2015
Creator:
Archick, Kristin & Belkin, Paul
Object Type:
Report
System:
The UNT Digital Library
Anomalies on orbifolds
We discuss the form of the chiral anomaly on an S1/Z2 orbifold with chiral boundary conditions. We find that the 4-divergence of the higher-dimensional current evaluated at a given point in the extra dimension is proportional to the probability of finding the chiral zero mode there. Nevertheless the anomaly, appropriately defined as the five dimensional divergence of the current, lives entirely on the orbifold fixed planes and is independent of the shape of the zero mode. Therefore long distance four dimensional anomaly cancellation ensures the consistency of the higher dimensional orbifold theory.
Date:
March 16, 2001
Creator:
Arkani-Hamed, Nima; Cohen, Andrew G. & Georgi, Howard
Object Type:
Article
System:
The UNT Digital Library
Recovery of weapon plutonium as feed material for reactor fuel
This report presents preliminary considerations for recovering and converting weapon plutonium from various US weapon forms into feed material for fabrication of reactor fuel elements. An ongoing DOE study addresses the disposition of excess weapon plutonium through its use as fuel for nuclear power reactors and subsequent disposal as spent fuel. The spent fuel would have characteristics similar to those of commercial power spent fuel and could be similarly disposed of in a geologic repository.
Date:
March 16, 1994
Creator:
Armantrout, G. A.; Bronson, M. A. & Choi, Jor-Shan
Object Type:
Report
System:
The UNT Digital Library
Post driver
Patent for a portable post driver.
Date:
March 16, 1900
Creator:
Armstrong, Joseph Milton
Object Type:
Patent
System:
The Portal to Texas History
Search for the rare decay B to pi l+ l-
The authors have performed a search for the flavor-changing neutral-current decays B {yields} {pi}{ell}{sup +}{ell}{sup -}, where {ell}{sup +}{ell}{sup -} is either e{sup +}e{sup -} or {mu}{sup +}{mu}{sup -}, using a sample of 230 million {Upsilon}(4S) {yields} B{bar B} decays collected with the BABAR detector. They observe no evidence of a signal and measure the upper limit on the isospin-averaged branching fraction to be {Beta}(B {yields} {pi}{ell}{sup +}{ell}{sup -}) < 9.1 x 10{sup -8} at 90% confidence level. They also search for the lepton-flavor-violating decays B {yields} {pi}e{sup {+-}} {mu}{sup {-+}} and measure an upper limit on the isospin-averaged branching fraction of {Beta}(B {yields} {pi}e{sup {+-}} {mu}{sup {-+}}) < 9.2 x 10{sup -8} at 90% confidence level.
Date:
March 16, 2007
Creator:
Aubert, B.
Object Type:
Article
System:
The UNT Digital Library
Double Shell Tank (DST) Monitor and Control Subsystem Definition Report
The system description of the Double-Shell Tank (DST) Monitor and Control Subsystem establishes the system boundaries and describes the interface of the DST Monitor and Control Subsystem with new and existing systems that are required to accomplish the Waste Feed Delivery (WFD) mission.
Date:
March 16, 2000
Creator:
Bafus, Ron R.
Object Type:
Report
System:
The UNT Digital Library
Measurement/Evaluation Techniques and Nuclear Data Associated with Fission of 239Pu by Fission Spectrum Neutrons
This Panel was chartered to review and assess new evaluations of work on fission product data, as well as the evaluation process used by the two U.S. nuclear weapons physics laboratories. The work focuses on fission product yields resulting from fission spectrum neutrons incident on plutonium, and includes data from measurements that had not been previously published as well as new or revised fission product cumulative yield data, and related quantities such as Q values and R values. This report documents the Panel's assessment of the work presented by Los Alamos National Laboratory (LANL) and Lawrence Livermore National Laboratory (LLNL). Based on the work presented we have seven key observations: (1) Experiments conducted in the 1970s at LANL, some of which were performed in association with a larger, NIST-led, program, have recently been documented. A preliminary assessment of this work, which will be referred to in this document as ILRR-LANL, shows it to be technically sound. (2) LLNL has done a thorough, unbiased review and evaluation of the available literature and is in the process of incorporating the previously unavailable LANL data into its evaluation of key fission product yields. The results of the LLNL effort, which includes a preliminary …
Date:
March 16, 2010
Creator:
Baisden, Patricia; Bauge, Eric; Ferguson, James; Gilliam, David; Granier, Thierry; Jeanloz, Raymond et al.
Object Type:
Report
System:
The UNT Digital Library
The International Criminal Court (ICC): Jurisdiction, Extradition, and U.S. Policy
This report focuses on the process by which the Office of the Prosecutor investigates allegations of war crimes and second on U.S policy towards the International Criminal Court (ICC) and how the court might assert jurisdiction over U.S. nationals.
Date:
March 16, 2010
Creator:
Barbour, Emily C. & Weed, Matthew C.
Object Type:
Report
System:
The UNT Digital Library
Energy and particle flow in low temperature plasmas
Increased interest in the development of high density plasma sources for ultra large scale integrated circuit manufacturing with varying geometry and power coupling strategies require the development of 2D models for accurate plasma reactor studies. An objective of their research was to develop a computationally efficient numerical code that would be useful as a design tool for inductively coupled plasma reactors. To achieve that goal the authors created a 2D fluid model (INDUCT2D) of an argon discharge. As uniformity is a primary issue in wafer manufacturing they have used INDUCT2D to investigate the effect of pressure and reactor geometry on the spatial uniformity of the etching ion flux. They have found that the optimum pressure for maximum uniformity depends upon the spatial profile of the inductive heating, and decreases with the reactor aspect ratio.
Date:
March 16, 1995
Creator:
Bardsley, J.N.; Hewett, D.W. & Vitello, P.
Object Type:
Report
System:
The UNT Digital Library
Trolley-Pole.
Patent for a trolley pole, which attaches easily to the wire and can be placed on it by the operator without him leaving his station on the trolley.
Date:
March 16, 1909
Creator:
Barr, George T., Sr.
Object Type:
Patent
System:
The Portal to Texas History
Knee-Protector
Patent for a knee protector "adapted to be worn by cotton pickers, miners, and other workmen who are required to walk or labor while resting on the knees. The present invention contemplates the provision of a knee protector of unique construction...the present device while applied to the knee, permitting the wearer to walk conveniently either while standing or kneeling."
Date:
March 16, 1915
Creator:
Bassett, Rufus C.
Object Type:
Patent
System:
The Portal to Texas History
Status of Issues in U.S. Edge-Plasma Research and Priority Topics for the Next Five Years
The Edge Coordinating Committee (ECC) was formed in July 14-15, 2004 when OFES Theory Team invited 14 plasma researchers to a two-day meeting in Germantown, MD to discuss the state of edge-plasma research in the U.S. with a focus on theory and modeling (see http://www.mfescience.org/ecc/ ecc/). At that time, OFES tasked the ECC with providing, in about a six month period, a report on the present status of key issues in this area together with a roadmap of what range of activities should be undertaken in the next five years to resolve these issues. This document is a response to that charge. Future edge-plasma research described here is assumed to fit into a budget constraint of a ''flat budget,'' with some additional activities cited for budget increases of as much as 50%. To obtain some measure of the relative fraction of OFES Theory funding presently devoted to edge plasma research, the OFES Theory Team informally surveyed funded work they support in this area at National Labs, Universities, and industry. John Mandrekas reported to us that approximately 10% of the present budget goes to edge-physics areas at 10 institutions, for a total of {approx}$2.5M each year. While not explicitly estimated, we …
Date:
March 16, 2005
Creator:
Bateman, G.; Chang, C.; Fenstermacher, M.; Guzdar, P.; Hahm, T. S.; Krasheninnikov, S. et al.
Object Type:
Report
System:
The UNT Digital Library
Chromosome-specific DNA Repeat Probes
In research as well as in clinical applications, fluorescence in situ hybridization (FISH) has gained increasing popularity as a highly sensitive technique to study cytogenetic changes. Today, hundreds of commercially available DNA probes serve the basic needs of the biomedical research community. Widespread applications, however, are often limited by the lack of appropriately labeled, specific nucleic acid probes. We describe two approaches for an expeditious preparation of chromosome-specific DNAs and the subsequent probe labeling with reporter molecules of choice. The described techniques allow the preparation of highly specific DNA repeat probes suitable for enumeration of chromosomes in interphase cell nuclei or tissue sections. In addition, there is no need for chromosome enrichment by flow cytometry and sorting or molecular cloning. Our PCR-based method uses either bacterial artificial chromosomes or human genomic DNA as templates with {alpha}-satellite-specific primers. Here we demonstrate the production of fluorochrome-labeled DNA repeat probes specific for human chromosomes 17 and 18 in just a few days without the need for highly specialized equipment and without the limitation to only a few fluorochrome labels.
Date:
March 16, 2006
Creator:
Baumgartner, Adolf; Weier, Jingly Fung & Weier, Heinz-Ulrich G.
Object Type:
Article
System:
The UNT Digital Library