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16,000-rpm Interior Permanent Magnet Reluctance Machine with Brushless Field Excitation
The reluctance interior permanent magnet (RIPM) motor is currently used by many leading auto manufacturers for hybrid vehicles. The power density for this type of motor is high compared with that of induction motors and switched reluctance motors. The primary drawback of the RIPM motor is the permanent magnet (PM) because during high-speed operation, the fixed PM produces a huge back electromotive force (emf) that must be reduced before the current will pass through the stator windings. This reduction in back-emf is accomplished with a significant direct-axis (d-axis) demagnetization current, which opposes the PM's flux to reduce the flux seen by the stator wires. This may lower the power factor and efficiency of the motor and raise the requirement on the alternate current (ac) power supply; consequently, bigger inverter switching components, thicker motor winding conductors, and heavier cables are required. The direct current (dc) link capacitor is also affected when it must accommodate heavier harmonic currents. It is commonly agreed that, for synchronous machines, the power factor can be optimized by varying the field excitation to minimize the current. The field produced by the PM is fixed and cannot be adjusted. What can be adjusted is reactive current to the …
Date:
October 31, 2007
Creator:
Hsu, J. S.; Burress, T. A.; Lee, S. T.; Wiles, R. H.; Coomer, C. L.; McKeever, J.W. et al.
Object Type:
Report
System:
The UNT Digital Library
15th Street News (Midwest City, Okla.), Vol. 37, No. 2, Ed. 1 Friday, August 31, 2007
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
August 31, 2007
Creator:
Pace, Joshua
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
2007 Annual Report Summer Research Institute Interfacial and Condensed Phase Chemical Physics
The Pacific Northwest National Laboratory (PNNL) hosted its fourth annual Summer Research Institute in Interfacial and Condensed Phase Chemical Physics from April through September 2007. During this time, 21 PNNL scientists hosted 23 participants from 20 different universities. Of the 23 participants, 20 were graduate students, 1 was a postdoctoral fellow, and 2 were university faculty members. This report covers the essense of the program and the research the participants performed.
Date:
October 31, 2007
Creator:
Beck, Kenneth M.
Object Type:
Report
System:
The UNT Digital Library
80th Texas Legislature, Regular Session, House Concurrent Resolution 241
Concurrent resolution introduced by the Texas House of Representatives and Senate relating to in memory of Heidi Lynn Fender of Mount Pleasant.
Date:
May 31, 2007
Creator:
Texas. Legislature. House of Representatives.
Object Type:
Legislative Document
System:
The Portal to Texas History
Accurate Iterative Analysis Solution of theKapchinskij-Vladimirskij Equations for the Case of a Matched Beam
The well-known Kapchinskij-Vladimirskij (KV) equations are difficult to solve in general, but the problem is simplified for the matched-beam case with sufficient symmetry. They show that the interdependence of the two KV equations is eliminated, so that only one needs to be solved--a great simplification. They present an iterative method of solution which can potentially yield any desired level of accuracy. The lowest level, the well-known smooth approximation, yields simple, explicit results with good accuracy for weak or moderate focusing fields. The next level improves the accuracy for high fields; they previously showed [Part. Accel. 52, 133 (1996)] how to maintain a simple explicit format for the results. That paper used expansion in a small parameter to obtain results of second-level accuracy. The present paper, using straightforward iteration, obtains equations of first, second, and third levels of accuracy. For a periodic lattice with beam matched to lattice, they use the lattice and beam parameters as input and solve for phase advances and envelope functions. They find excellent agreement with numerical solutions over a wide range of beam emittances and intensities.
Date:
January 31, 2007
Creator:
Anderson, O. A.
Object Type:
Report
System:
The UNT Digital Library
Achieve Continuous Injection of Solid Fuels into Advanced Combustion System Pressures
The overall objective of this project is the development of a mechanical rotary-disk feeder, known as the Stamet Posimetric High Pressure Solids Feeder System, to demonstrate feeding of dry granular coal continuously and controllably into pressurized environments of up to 70 kg/cm2 (1,000 psi). This is the Phase III of the ongoing program. Earlier Phases 1 and II successfully demonstrated feeding into pressures up to 35 kg/cm{sup 2} (500 psi). The final report for those phases was submitted in April 2005. Based on the previous work done in Phases I & II using Powder River Basin coal provided by the PSDF facility in Wilsonville, AL, a Phase III feeder system was designed and built to accomplish the target of feeding the coal into a pressure of 70 kg/cm2 (1,000 psi) and to be capable of feed rates of up to 550 kilograms (1,200lbs) per hour. The drive motor system from Phase II was retained for use on Phase III since projected performance calculations indicated it should be capable of driving the Phase III pump to the target levels. The pump & motor system was installed in a custom built test rig comprising an inlet vessel containing an active live-wall hopper …
Date:
March 31, 2007
Creator:
Aldred, Derek L. & Saunders, Timothy
Object Type:
Report
System:
The UNT Digital Library
Advanced Branching Control and Characterization of Inorganic Semiconducting Nanocrystals
The ability to finely tune the size and shape of inorganic semiconducting nanocrystals is an area of great interest, as the more control one has, the more applications will be possible for their use. The first two basic shapes develped in nanocrystals were the sphere and the anistropic nanorod. the II_VI materials being used such as Cadmium Selenide (CdSe) and Cadmium Telluride (CdTe), exhibit polytypism, which allows them to form in either the hexagonally packed wurtzite or cubically packed zinc blende crystalline phase. The nanorods are wurtzite with the length of the rod growing along the c-axis. As this grows, stacking faults may form, which are layers of zinc blende in the otherwise wurtzite crystal. Using this polytypism, though, the first generation of branched crystals were developed in the form of the CdTe tetrapod. This is a nanocrystal that nucleates in the zincblend form, creating a tetrahedral core, on which four wurtzite arms are grown. This structure opened up the possibility of even more complex shapes and applications. This disseration investigates the advancement of branching control and further understanding the materials polytypism in the form of the stacking faults in nanorods.
Date:
December 31, 2007
Creator:
Hughes, Steven Michael
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Advanced Electric Systems and Aerodynamics for Efficiency Improvements in Heavy Duty Trucks
The Advanced Electric Systems and Aerodynamics for Efficiency Improvements in Heavy Duty Trucks program (DE-FC26-04NT42189), commonly referred to as the AES program, focused on areas that will primarily benefit fuel economy and improve heat rejection while driving over the road. The AES program objectives were to: (1) Analyze, design, build, and test a cooling system that provided a minimum of 10 percent greater heat rejection in the same frontal area with no increase in parasitic fan load. (2) Realize fuel savings with advanced power management and acceleration assist by utilizing an integrated starter/generator (ISG) and energy storage devices. (3) Quantify the effect of aerodynamic drag due to the frontal shape mandated by the area required for the cooling system. The program effort consisted of modeling and designing components for optimum fuel efficiency, completing fabrication of necessary components, integrating these components into the chassis test bed, completing controls programming, and performance testing the system both on a chassis dynamometer and on the road. Emission control measures for heavy-duty engines have resulted in increased engine heat loads, thus introducing added parasitic engine cooling loads. Truck electrification, in the form of thermal management, offers technological solutions to mitigate or even neutralize the effects …
Date:
October 31, 2007
Creator:
Slone, Larry & Birkel, Jeffrey
Object Type:
Report
System:
The UNT Digital Library
Advanced Fine Particulate Characterization Methods
The characterization and control of emissions from combustion sources are of significant importance in improving local and regional air quality. Such emissions include fine particulate matter, organic carbon compounds, and NO{sub x} and SO{sub 2} gases, along with mercury and other toxic metals. This project involved four activities including Further Development of Analytical Techniques for PM{sub 10} and PM{sub 2.5} Characterization and Source Apportionment and Management, Organic Carbonaceous Particulate and Metal Speciation for Source Apportionment Studies, Quantum Modeling, and High-Potassium Carbon Production with Biomass-Coal Blending. The key accomplishments included the development of improved automated methods to characterize the inorganic and organic components particulate matter. The methods involved the use of scanning electron microscopy and x-ray microanalysis for the inorganic fraction and a combination of extractive methods combined with near-edge x-ray absorption fine structure to characterize the organic fraction. These methods have direction application for source apportionment studies of PM because they provide detailed inorganic analysis along with total organic and elemental carbon (OC/EC) quantification. Quantum modeling using density functional theory (DFT) calculations was used to further elucidate a recently developed mechanistic model for mercury speciation in coal combustion systems and interactions on activated carbon. Reaction energies, enthalpies, free energies and …
Date:
January 31, 2007
Creator:
Benson, Steven; Kong, Lingbu; Azenkeng, Alexander; Laumb, Jason; Jensen, Robert; Olson, Edwin et al.
Object Type:
Report
System:
The UNT Digital Library
Advanced Multi-Product Coal Utilization By-Product Processing Plant
The objective of the project is to build a multi-product ash beneficiation plant at Kentucky Utilities 2,200-MW Ghent Generating Station, located in Carroll County, Kentucky. Phase 1 was completed successfully, but the project did not continue on to Phase 2 due to withdrawal of CEMEX from the project. Attempts at replacing CEMEX were not successful. Problematic to the continuation of the project was its location in the Ohio Valley which is oversupplied and has low prices for fly ash and the change in CEMEX priorities due to merger and acquisitions. Thus, CAER concurred with the DOE to conclude the project at the end of Budget Period 1, March 31, 2007.
Date:
March 31, 2007
Creator:
Robl, Thomas & Groppo, John
Object Type:
Report
System:
The UNT Digital Library
Advanced Oxyfuel Boilers and Process Heaters for Cost Effective CO2 Capture and Sequestration
The purpose of the advanced boilers and process heaters program is to assess the feasibility of integrating Oxygen Transport Membranes (OTM) into combustion processes for cost effective CO{sub 2} capture and sequestration. Introducing CO{sub 2} capture into traditional combustion processes can be expensive, and the pursuit of alternative methods, like the advanced boiler/process heater system, may yield a simple and cost effective solution. In order to assess the integration of an advanced boiler/process heater process, this program addressed the following tasks: Task 1--Conceptual Design; Task 2--Laboratory Scale Evaluation; Task 3--OTM Development; Task 4--Economic Evaluation and Commercialization Planning; and Task 5--Program Management. This Final report documents and summarizes all of the work performed for the DOE award DE-FC26-01NT41147 during the period from January 2002-March 2007. This report outlines accomplishments for the following tasks: conceptual design and economic analysis, oxygen transport membrane (OTM) development, laboratory scale evaluations, and program management.
Date:
March 31, 2007
Creator:
Christie, Max; Victor, Rick; Hassel, Bart van; Nagabushana, Nagendra; Li, Juan; Corpus, Joseph et al.
Object Type:
Report
System:
The UNT Digital Library
Advanced Process Heater for the Steel, Aluminum and Chemical Industries of the Future
The Roadmap for Process Heating Technology (March 16, 2001), identified the following priority R&D needs: “Improved performance of high temperature materials; improved methods for stabilizing low emission flames; heating technologies that simultaneously reduce emissions, increase efficiency, and increase heat transfer”. Radiant tubes are used in almost every industry of the future. Examples include Aluminum re-heat furnaces; Steel strip annealing furnaces, Petroleum cracking/ refining furnaces, Metal Casting/Heat Treating in atmosphere and fluidized bed furnaces, Glass lair annealing furnaces, Forest Products infrared paper driers, Chemical heat exchangers and immersion heaters, and the indirect grain driers in the Agriculture Industry. Several common needs among the industries are evident: (1) Energy Reductions, (2) Productivity Improvements, (3) Zero Emissions, and (4) Increased Component Life. The Category I award entitled “Proof of Concept of an Advanced Process Heater (APH) for Steel, Aluminum, and Petroleum Industries of the Future” met the technical feasibility goals of: (1) doubling the heat transfer rates (2) improving thermal efficiencies by 20%, (3) improving temperature uniformity by 100oF (38 oC) and (4) simultaneously reducing NOx and CO2 emissions. The APH addresses EERE’s primary mission of increasing efficiency/reducing fuel usage in energy intensive industries. The primary goal of this project was to design, …
Date:
October 31, 2007
Creator:
Briselden, Thomas D.
Object Type:
Report
System:
The UNT Digital Library
Advanced Reservoir Imaging Using Frequency-Dependent Seismic Attributes
Our report concerning advanced imaging and interpretation technology includes the development of theory, the implementation of laboratory experiments and the verification of results using field data. We investigated a reflectivity model for porous fluid-saturated reservoirs and demonstrated that the frequency-dependent component of the reflection coefficient is asymptotically proportional to the reservoir fluid mobility. We also analyzed seismic data using different azimuths and offsets over physical models of fractures filled with air and water. By comparing our physical model synthetics to numerical data we have identified several diagnostic indicators for quantifying the fractures. Finally, we developed reflectivity transforms for predicting pore fluid and lithology using rock-property statistics from 500 reservoirs in both the shelf and deep-water Gulf of Mexico. With these transforms and seismic AVO gathers across the prospect and its down-dip water-equivalent reservoir, fluid saturation can be estimated without a calibration well that ties the seismic. Our research provides the important additional mechanisms to recognize, delineate, and validate new hydrocarbon reserves and assist in the development of producing fields.
Date:
December 31, 2007
Creator:
Hilterman, Fred; Patzek, Tad; Goloshubin, Gennady; Silin, Dmitriy; Sullivan, Charlotte & Korneev, Valeri
Object Type:
Report
System:
The UNT Digital Library
Advanced Ultra-High Speed Motor for Drilling
Three (3) designs have been made for two sizes, 6.91 cm (2.72 inch) and 4.29 cm (1.69 inch) outer diameters, of a patented inverted configured Permanent Magnet Synchronous Machines (PMSM) electric motor specifically for drilling at ultra-high rotational speeds (10,000 rpm) and that can utilize advanced drilling methods. Benefits of these motors are stackable power sections, full control (speed and direction) of downhole motors, flow hydraulics independent of motor operation, application of advanced drilling methods (water jetting and abrasive slurry jetting), and the ability of signal/power electric wires through motor(s). Key features of the final designed motors are: fixed non-rotating shaft with stator coils attached; rotating housing with permanent magnet (PM) rotor attached; bit attached to rotating housing; internal channel(s) in a nonrotating shaft; electric components that are hydrostatically isolated from high internal pressure circulating fluids ('muds') by static metal to metal seals; liquid filled motor with smoothed features for minimized turbulence in the motor during operation; and new inverted coated metal-metal hydrodynamic bearings and seals. PMSM, Induction and Switched Reluctance Machines (SRM), all pulse modulated, were considered, but PMSM were determined to provide the highest power density for the shortest motors. Both radial and axial electric PMSM driven motors …
Date:
March 31, 2007
Creator:
LLC, Impact Technologies & Arlington, University of Texas at
Object Type:
Report
System:
The UNT Digital Library
Advanced Utility Mercury-Sorbent Field-Testing Program
This report summarizes the work conducted from September 1, 2003 through December 31, 2007 on the project entitled Advanced Utility Mercury-Sorbent Field-Testing Program. The project covers the testing at the Detroit Edison St. Clair Plant and the Duke Power Cliffside and Buck Stations. The St. Clair Plant used a blend of subbituminous and bituminous coal and controlled the particulate emissions by means of a cold-side ESP. The Duke Power Stations used bituminous coals and controlled their particulate emissions by means of hot-side ESPs. The testing at the Detroit Edison St. Clair Plant demonstrated that mercury sorbents could be used to achieve high mercury removal rates with low injection rates at facilities that burn subbituminous coal. A mercury removal rate of 94% was achieved at an injection rate of 3 lb/MMacf over the thirty day long-term test. Prior to this test, it was believed that the mercury in flue gas of this type would be the most difficult to capture. This is not the case. The testing at the two Duke Power Stations proved that carbon- based mercury sorbents can be used to control the mercury emissions from boilers with hot-side ESPs. It was known that plain PACs did not have …
Date:
December 31, 2007
Creator:
Landreth, Ronald
Object Type:
Report
System:
The UNT Digital Library
Advanced Waveform Simulation for Seismic Monitoring Events
This one page report is about Advanced Waveform Simulation for Seismic Monitoring Events.
Date:
January 31, 2007
Creator:
Helmberger, Donald V.; Tromp, Jeroen & Rodgers, Arthur J.
Object Type:
Report
System:
The UNT Digital Library
ADVANCED WAVEFORM SIMULATION FOR SEISMIC MONITORING EVENTS; REPORTING PERIOD NOVEMBER 1, 2006 - JANUARY 31, 2007
The amplitude fluctuations of seismic waves from point source radiation patterns are among the direct results of rupture propagation. However, these amplitude signals are seldom used for small earthquakes due to the large uncertainties in the focal mechanisms of the events or the empirical Green’s functions (EGFs). Moreover, it has been controversial if radiation patterns still exist at high frequencies, e.g., 10 Hz. We present an evidence for high frequency radiation patterns by showing that with accurately determined focal mechanism solutions, the broadband P wave records from a thrust event (M 3.0) can be turned into those from a distinctly different strike slip event of similar magnitude with simple radiation pattern corrections. Moreover, we observe systematic azimuthal variations in the P and S wave amplitude ratios between the records from unilateral magnitude 4 events and the EGF events, which suggest that these simple amplitude ratios can provide fast and useful indications of the rupture directivity. For further estimates of the fault dimension and rupture speed, we developed a forward modeling approach to retrieve apparent source time functions (ASTFs) of small earthquakes, where we assume simple Haskell model and take a grid search approach to find the ASTFs for each recording …
Date:
January 31, 2007
Creator:
Helmberger, Donald V.; Tromp, Jeroen & Rodgers, Arthur J.
Object Type:
Report
System:
The UNT Digital Library
Afterburning and Combustion in Explosions in Barometric Calorimeters
None
Date:
May 31, 2007
Creator:
Reichenbach, H; Neuwald, P & Kuhl, A L
Object Type:
Article
System:
The UNT Digital Library
Agricultural Exports and the 2007 Farm Bill
This report assesses 2007 farm bill trade title provisions for U.S. agricultural export programs. Moreover, the report considers the modifications made to both the Senate and House of Representatives version of the bill to meet World Trade Organization (WTO) regulations.
Date:
October 31, 2007
Creator:
Hanrahan, Charles E.
Object Type:
Report
System:
The UNT Digital Library
Air Pollution as a Commodity: Regulation of the Sulfur Dioxide Allowance Market
This report considers a variety of programs submitted to Congress to reduce greenhouse gases (GHGs). Specifically, programs that have market implications are getting the most attention. Moreover, the report compares these programs to the current Title IV programs.
Date:
October 31, 2007
Creator:
Parker, Larry & Jickling, Mark
Object Type:
Report
System:
The UNT Digital Library
Air Quality Issues and Animal Agriculture: A Primer
This report reviews the types of air emissions from livestock and poultry operations and their human health and environmental impacts. It then discusses provisions of several federal laws concerned with environmental impacts, beginning with the Clean Water Act, because protecting water resources has been the primary regulatory focus regarding livestock and animal operations.
Date:
August 31, 2007
Creator:
Copeland, Claudia
Object Type:
Report
System:
The UNT Digital Library
Air Quality Issues and Animal Agriculture: EPA’s Air Compliance Agreement
From an environmental quality standpoint, much of the interest in animal agriculture has focused on impacts on water resources, because animal waste, if not properly managed, can harm water quality through surface runoff, direct discharges, spills, and leaching into soil and groundwater. A more recent issue is the contribution of emissions from animal feeding operations (AFO), enterprises where animals are raised in confinement, to air pollution. AFOs can affect air quality through emissions of gases such as ammonia and hydrogen sulfide, particulate matter, volatile organic compounds, hazardous air pollutants, and odor. These pollutants and compounds have a number of environmental and human health effects. This report reviews key issues associated with the Air Compliance Agreement.
Date:
August 31, 2007
Creator:
Copeland, Claudia
Object Type:
Report
System:
The UNT Digital Library
The Albany News (Albany, Tex.), Vol. 132, No. 1, Ed. 1 Thursday, May 31, 2007
Weekly newspaper from Albany, Texas that includes local, county, and state news along with extensive advertising.
Date:
May 31, 2007
Creator:
Lucas, Melinda L.
Object Type:
Newspaper
System:
The Portal to Texas History
The Altus Times (Altus, Okla.), Vol. 108, No. 263, Ed. 1 Wednesday, January 31, 2007
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
January 31, 2007
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History