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Cloud to CAD
This paper documents work performed to convert scanned range data to CAD solid model representation. The work successfully developed surface fitting algorithms for quadric surfaces (e.g. plane, cone, cylinder, and sphere), and a segmentation algorithm based entirely on surface type, rather than on a differential metric like Gaussian curvature. Extraction of all CAD-required parameters for quadric surface representation was completed. Approximate face boundaries derived from the original point cloud were constructed. Work to extrapolate surfaces, compute exact edges and solid connectivity was begun, but left incomplete due to funding reductions. The surface fitting algorithms are robust in the face of noise and degenerate surface forms.
Date:
May 1, 2001
Creator:
AMES,ARLO L.
Object Type:
Report
System:
The UNT Digital Library
OPTIMUM ENERGY ABSORPTION OF A SHORT-PULSE LASER IN A DOPED DIELECTRIC SLAB
A model is used to calculate energy absorption efficiency when a short-pulse laser impinges on a dielectric slab doped with an impurity for which the electrons have a resonant line at the laser wavelength. The amount of the energy resonant absorption is due to the overlapping between laser spectrum and resonance spectrum. The energy absorption efficiency can be maximized for a certain degree of doping concentration (at a given pulselength) and also for a certain pulselength (at a given doping concentration). For a modest amount of impurity, the resonant absorption may increase the fraction of energy absorption up to tens of percent of laser energy at 100s optical cycles when the laser wavelength is tuned within 1% of the resonant line. Dimensionless parameters are constructed so that the scaling to various parameters: laser wavelength, laser pulselength, dielectric constant, slab thickness, impurity concentration, resonant linewidth, and separation between the laser wavelength and the line resonance, could easily be obtained.
Date:
May 1, 2001
Creator:
ANG, L.
Object Type:
Article
System:
The UNT Digital Library
Linear Collider Physics Resource Book for Snowmass 2001
The American particle physics community can look forward to a well-conceived and vital program of experimentation for the next ten years, using both colliders and fixed target beams to study a wide variety of pressing questions. Beyond 2010, these programs will be reaching the end of their expected lives. The CERN LHC will provide an experimental program of the first importance. But beyond the LHC, the American community needs a coherent plan. The Snowmass 2001 Workshop and the deliberations of the HEPAP subpanel offer a rare opportunity to engage the full community in planning our future for the next decade or more. A major accelerator project requires a decade from the beginning of an engineering design to the receipt of the first data. So it is now time to decide whether to begin a new accelerator project that will operate in the years soon after 2010. We believe that the world high-energy physics community needs such a project. With the great promise of discovery in physics at the next energy scale, and with the opportunity for the uncovering of profound insights, we cannot allow our field to contract to a single experimental program at a single laboratory in the world. …
Date:
May 3, 2001
Creator:
Abe, T.; Dawson, S.; Heinemeyer, S.; Marciano, W.; Paige, F.; Turcot, A. S. et al.
Object Type:
Report
System:
The UNT Digital Library
EARLY ENTRANCE COPRODUCTION PLANT
The overall objective of this project is the three-phase development of an Early Entrance Coproduction Plant (EECP) that produces at least one product from at least two of the following three categories: Electric power (or heat); Fuels; and Chemicals. The objective is to have these products produced by technologies capable of using synthesis gas derived from coal and/or some other carbonaceous feedstock, such as petroleum coke. The objective of Phase I was to determine the feasibility and define the concept for the EECP located at a specific site and to develop a Research, Development, and Testing (RD and T) Plan for implementation in Phase II. This objective has now been accomplished. A specific site, Motiva Refinery in Port Arthur, Texas, has been selected as the location best suited for the EECP. The accomplishments of Phase I are discussed in detail in this Phase I Concept Report. A RD and T Plan and a preliminary project financing plan have been developed and are submitted separately from this report.
Date:
May 17, 2001
Creator:
Abughazaleh, John S.; Ahmed, Mushtaq; Anand, Ashok; Anderson, John H.; Benham, Charles; Brent, Fred D. et al.
Object Type:
Report
System:
The UNT Digital Library
HCCl Combustion: Analysis and Experiments
Homogeneous charge compression ignition (HCCI) is a new combustion technology that may develop as an alternative to diesel engines with high efficiency and low NOx and particulate matter emissions. This paper describes the HCCI research activities being currently pursued at Lawrence Livermore National Laboratory and at the University of California Berkeley. Current activities include analysis as well as experimental work. On analysis, we have developed two powerful tools: a single zone model and a multi-zone model. The single zone model has proven very successful in predicting start of combustion and providing reasonable estimates for peak cylinder pressure, indicated efficiency and NOX emissions. This model is being applied to develop detailed engine performance maps and control strategies, and to analyze the problem of engine startability. The multi-zone model is capable of very accurate predictions of the combustion process, including HC and CO emissions. The multi-zone model has applicability to the optimization of combustion chamber geometry and operating conditions to achieve controlled combustion at high efficiency and low emissions. On experimental work, we have done a thorough evaluation of operating conditions in a 4-cylinder Volkswagen TDI engine. The engine has been operated over a wide range of conditions by adjusting the intake …
Date:
May 4, 2001
Creator:
Aceves, S. M.; Flowers, D. L.; Martinez-Frias, J.; Smith, J. R.; Dibble, R.; Au, M. et al.
Object Type:
Article
System:
The UNT Digital Library
HCCI Combustion: Analysis and Experiments
Homogeneous charge compression ignition (HCCI) is a new combustion technology that may develop as an alternative to diesel engines with high efficiency and low NOx and particulate matter emissions. This paper describes the HCCI research activities being currently pursued at Lawrence Livermore National Laboratory and at the University of California Berkeley. Current activities include analysis as well as experimental work. On analysis, we have developed two powerful tools: a single zone model and a multi-zone model. The single zone model has proven very successful in predicting start of combustion and providing reasonable estimates for peak cylinder pressure, indicated efficiency and NOX emissions. This model is being applied to develop detailed engine performance maps and control strategies, and to analyze the problem of engine startability. The multi-zone model is capable of very accurate predictions of the combustion process, including HC and CO emissions. The multi-zone model h as applicability to the optimization of combustion chamber geometry and operating conditions to achieve controlled combustion at high efficiency and low emissions. On experimental work, we have done a thorough evaluation of operating conditions in a 4-cylinder Volkswagen TDI engine. The engine has been operated over a wide range of conditions by adjusting the …
Date:
May 14, 2001
Creator:
Aceves, Salvador M.; Flowers, Daniel L.; Martinez-Frias, Joel; Smith, J. Ray; Dibble, Robert; Au, Michael et al.
Object Type:
Article
System:
The UNT Digital Library
Solubility of Anthracene in Binary Alcohol + Methyl Acetate Solvent Mixtures at 298.2 K
Article on the solubility of anthracene in binary alcohol + methyl acetate solvent mixtures at 298.2 K.
Date:
May 19, 2001
Creator:
Acree, William E. (William Eugene)
Object Type:
Article
System:
The UNT Digital Library
Studies of the Transformations of Sulfur Containing Heterocycles by Transition Metal Cluster Compounds. Final Report, June 1, 1995 - October 31, 1999
Report on results of research on the catalytic macrocyclization reactions of thietane and thiolactones by metal carbonyl complexes.
Date:
May 16, 2001
Creator:
Adams, Richard D.
Object Type:
Report
System:
The UNT Digital Library
Oral History Interview with Bob Addobate, May 18, 2001
The National Museum of the Pacific War presents an interview with Bob Addobate. Addobate joined the Navy in June of 1941. Beginning in August, he served as a Signalman Second-Class aboard the USS Solace (AH-5), arriving in Pearl Harbor in October. They were docked in the Harbor when the Japanese attacked. From March to August of 1942 they traveled through the Pacific to Australia, and discharged patients. From August of 1942 through May of 1943, they cared for fleet casualties and servicemen wounded in the island campaigns. From June through August, they operated as a station hospital at Noumea, New Caledonia. In April of 1945, during a typhoon, Addobate had his leg crushed by a crane, which had to be amputated. He returned to the US and was medically discharged in January of 1946.
Date:
May 18, 2001
Creator:
Addobate, Bob
Object Type:
Sound
System:
The Portal to Texas History
Oral History Interview with Bob Addobate, May 18, 2001
The National Museum of the Pacific War presents an interview with Bob Addobate. Addobate joined the Navy in June of 1941. Beginning in August, he served as a Signalman Second-Class aboard the USS Solace (AH-5), arriving in Pearl Harbor in October. They were docked in the Harbor when the Japanese attacked. From March to August of 1942 they traveled through the Pacific to Australia, and discharged patients. From August of 1942 through May of 1943, they cared for fleet casualties and servicemen wounded in the island campaigns. From June through August, they operated as a station hospital at Noumea, New Caledonia. In April of 1945, during a typhoon, Addobate had his leg crushed by a crane, which had to be amputated. He returned to the US and was medically discharged in January of 1946.
Date:
May 18, 2001
Creator:
Addobate, Bob
Object Type:
Text
System:
The Portal to Texas History
Paleo-Climate and Glaciological Reconstruction in Central Asia through the Collection and Analysis of Ice Cores and Instrumental Data from the Tien Shan
While the majority of ice core investigations have been undertaken in the polar regions, a few ice cores recovered from carefully selected high altitude/mid-to-low latitude glaciers have also provided valuable records of climate variability in these regions. A regional array of high resolution, multi-parameter ice core records developed from temperate and tropical regions of the globe can be used to document regional climate and environmental change in the latitudes which are home to the vase majority of the Earth's human population. In addition, these records can be directly compared with ice core records available from the polar regions and can therefore expand our understanding of inter-hemispheric dynamics of past climate changes. The main objectives of our paleoclimate research in the Tien Shan mountains of middle Asia combine the development of detailed paleoenvironmental records via the physical and chemical analysis of ice cores with the analysis of modern meteorological and hydrological data. The first step in this research was the collection of ice cores from the accumulation zone of the Inylchek Glacier and the collection of meteorological data from a variety of stations throughout the Tien Shan. The research effort described in this report was part of a collaborative effort with …
Date:
May 30, 2001
Creator:
Aizen, Vladimir; Bren, Donald; Kreutz, Karl & Wake, Cameron
Object Type:
Report
System:
The UNT Digital Library
Multicell CDMA Network Design
This article discusses multicell CDMA network design.
Date:
May 2001
Creator:
Akl, Robert G.; Hegde, Manju V.; Naraghi-Pour, Mort & Min, Paul S.
Object Type:
Article
System:
The UNT Digital Library
DEVELOPMENT OF IMPROVED CATALYSTS FOR THE SELECTIVE CATALYTIC REDUCTION OF NITROGEN OXIDES WITH HYDROCARBONS
Significant work has been done by the investigators on the cerium oxide-copper oxide based sorbent/catalysts for the combined removal of sulfur and nitrogen oxides from the flue gases of stationary sources. A relatively wide temperature window was established for the use of alumina-supported cerium oxide-copper oxide mixtures as regenerable sorbents for SO{sub 2} removal. Preliminary evaluation of these sorbents as catalysts for the selective reduction of NO{sub x} gave promising results with ammonia, but indicated low selectivity when methane was used as the reductant. Since the replacement of ammonia by another reductant is commercially very attractive, in this project, four research components will be undertaken. The investigation of the reaction mechanism, the first component, will help in the selection of promoters to improve the catalytic activity and selectivity of the sorbents in the SCR with methane. This will result in new catalyst formulations (second component). If this research is successful, the combined SO{sub 2}-NO{sub x} removal process based on alumina-supported copper oxide-ceria sorbent/catalysts will become very attractive for commercial applications. The objective of the third component of the project is to develop an alternative SCR process using another inexpensive fuel, residual fuel oil, instead of natural gas. This innovative proposal …
Date:
May 31, 2001
Creator:
Akyurtlu, Dr. Ates & Akyurtlu, Dr. Jale F.
Object Type:
Report
System:
The UNT Digital Library
Laboratory Directed Research and Development FY 2000 Annual Report
This Annual Report provides an overview of the FY2000 Laboratory Directed Research and Development (LDRD) Program at Lawrence Livermore National Laboratory (LLNL) and presents a summary of the results achieved by each project during the year.
Date:
May 24, 2001
Creator:
Al-Ayat, R
Object Type:
Report
System:
The UNT Digital Library
Radiation dose measurements of the insertion devices.
Results of radiation dose measurements of the insertion devices for the year 2000 have been added as Figures 29-35.
Date:
May 9, 2001
Creator:
Alderman, J.; Semones, E. & Job, P. K.
Object Type:
Report
System:
The UNT Digital Library
Development of a Procedure to Evaluate Groundwater Quality and Potential Sources of Contamination in the East Texas Basin
Access:
Use of this item is restricted to the UNT Community
This study contributes a procedure, based on data analysis and geostatistical methods, to evaluate the distribution of chemical ratios and differentiate natural and anthropogenic contaminant sources of groundwater quality in the East Texas Basin. Four aquifers were studied, Sparta, Queen City, Carrizo and Wilcox. In this study, Carrizo- Wilcox is considered as one aquifer, and Sparta-Queen City as another. These aquifers were divided into depth categories, 0-150 feet for Sparta-Queen City and 300-600 feet and 600-900 feet for Carrizo-Wilcox in order to identify individual sources of contamination. Natural sources include aquifer mineral make up, salt domes and lignite beds. Major anthropogenic sources include lignite and salt dome mining and oil-gas production. Chemical ratios selected were Na/Cl, Ca/Cl, Mg/Cl, SO4/Cl, (Na+Cl)/TDS, SO4/Ca and (Ca+Mg)/(Na+K). Ratio distributions and their relationships were examined to evaluate physical-chemical processes occurring in the study area. Potential contaminant sources were used to divide the Basin into three areas: Area 1 to the east, Area 2 in the west and Area 3 in the center. Bivariate analysis was used to uncover differences between the areas. The waters in Area 1 are potentially impacted primarily from oil field waters. Sources present in Area 2 include lignite beds and oil …
Date:
May 2001
Creator:
Alderman, John H.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
U.S. Department of Energy and Polish Institute for Ecology of Industrial Areas Joint Coordinating Committee for Environmental Systems FY00 Annual Report
The complexity of environmental pollution, not reported all over the world, increases the demand for novel, highly efficient and cost-effective rehabilitation technologies.
Date:
May 23, 2001
Creator:
Altman, D. J.
Object Type:
Report
System:
The UNT Digital Library
Oral History Interview with Dayton L. Alverson, May 10, 2001
Transcript of an oral inerview with Doctor Dayton L. Alverson. He was born in 1924 in the San Diego Naval Hospital. He joined the Navy and received training in radio interception. Went to Washington, DC where he volunteered for assignment to the Sino-American Cooperative Organization (SACO) as a Radioman First Class. Left Newport News in July 1944 and sailed to Bombay, India and took the train to Calcutta. He was flown on a DC-3 over "The Hump" and into Kunming, China. He volunteered for duty near Amoy Island, which was occupied by the Japanese and was flown to Zhangping and traveled to a small encampment 25 miles north of Amoy. He recounts his time intercepting Japanese code and sending it to Chungking and provides details about breaking the code. He next describes taking 38 days to travel 18,000 miles on foot, in sampans and on trucks to reach the camp. He describes the methods by which the Chinese moved the sampans up and down the rivers. He was then assigned to a group making a raid on a small island adjacent to Amoy. He traveled by sampan down the river to Shima, China in order to deliver two 50-caliber machine …
Date:
May 10, 2001
Creator:
Alverson, Dayton L.
Object Type:
Sound
System:
The Portal to Texas History
Oral History Interview with Dayton L. Alverson, May 10, 2001
Transcript of an oral inerview with Doctor Dayton L. Alverson. He was born in 1924 in the San Diego Naval Hospital. He joined the Navy and received training in radio interception. Went to Washington, DC where he volunteered for assignment to the Sino-American Cooperative Organization (SACO) as a Radioman First Class. Left Newport News in July 1944 and sailed to Bombay, India and took the train to Calcutta. He was flown on a DC-3 over "The Hump" and into Kunming, China. He volunteered for duty near Amoy Island, which was occupied by the Japanese and was flown to Zhangping and traveled to a small encampment 25 miles north of Amoy. He recounts his time intercepting Japanese code and sending it to Chungking and provides details about breaking the code. He next describes taking 38 days to travel 18,000 miles on foot, in sampans and on trucks to reach the camp. He describes the methods by which the Chinese moved the sampans up and down the rivers. He was then assigned to a group making a raid on a small island adjacent to Amoy. He traveled by sampan down the river to Shima, China in order to deliver two 50-caliber machine …
Date:
May 10, 2001
Creator:
Alverson, Dayton L.
Object Type:
Text
System:
The Portal to Texas History
The CLAS Forward Electromagnetic Calorimeter
The CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab utilizes six iron-free superconducting coils to provide an approximately toroidal magnetic field. The six sectors are instrumented individually to form six independent spectrometers. The forward region (8deg < (theta) < 45deg) of each sector is equipped with a lead-scintillator electromagnetic sampling calorimeter (EC), 16 radiation lengths thick, using a novel triangular geometry with stereo readout. With its good energy and position resolution, the EC is used to provide the primary electron trigger for CLAS. It is also used to reject pions, reconstruct pi-0 and eta decays and detect neutrons, This paper treats the design, construction and performance of the calorimeter.
Date:
May 1, 2001
Creator:
Amarian, M.; Asryan, Geram; Beard, Kevin; Brooks, Will; Burkert, Volker; Carstens, Tom et al.
Object Type:
Article
System:
The UNT Digital Library
Physical Characterization and Steam Chemical Reactivity of Carbon Fiber Composites
This report documents experiments and analyses that have been done at the Idaho National Engineering and Environmental Laboratory (INEEL) to measure the steam chemical reactivity of two types of carbon fiber composites, NS31 and NB31, proposed for use at the divertor strike points in an ITER-like tokamak. These materials are 3D CFCs constituted by a NOVOLTEX preform and densified by pyrocarbon infiltration and heat treatment. NS31 differs from NB31 in that the final infiltration was done with liquid silicon to reduce the porosity and enhance the thermal conductivity of the CFC. Our approach in this work was twofold: (1) physical characterization measurements of the specimens and (2) measurements of the chemical reactivity of specimens exposed to steam.
Date:
May 1, 2001
Creator:
Anderl, Robert Andrew; Pawelko, Robert James & Smolik, Galen Richard
Object Type:
Report
System:
The UNT Digital Library
The Tracings, Volume 19, Number 1, May 2001
Newsletter of the the Anderson County Genealogical Society containing genealogical information such as generation charts, family histories, and lists of records (births, deaths, church records, etc.).
Date:
May 2001
Creator:
Anderson County Genealogical Society
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Virtual Teams and Technology: The Relationship between Training and Team Effectiveness
The impact of training on virtual team effectiveness was assessed in five areas: communication, planning tasks and setting goals, solving problems and making decisions, resolving conflict, and responding to customer requirements. A 12-page survey was developed exploring all aspects of virtual teams. 180 surveys were distributed, 52 were returned representing 43 companies. Training led to higher effectiveness in planning tasks and setting goals, solving problems and making decisions, and conflict resolution, but not in communication and responding to customer requirements. Training may not solve all the problems that virtual teams will encounter; however, training will make the challenges easier to handle.
Date:
May 2001
Creator:
Andrews, Angelique
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
CO-FIRING COAL: FEEDLOT AND LITTER BIOMASS FUELS
The following are proposed activities for quarter 3 (12/15/00-3/14/01): (1) Conduct TGA and fuel characterization studies - Task 1; (2) Continue to perform re-burn experiments. - Task 2; (3) Design fixed bed combustor. - Task 3; and (4) Modify the PCGC2 code to include moisture evaporation model - Task 4. The following were achieved During Quarter 3 (12/15/0-3/14/01): (1) Conducted TGA and Fuel Characterization studies (Appendix I). A comparison of -fuel properties, TGA traces etc is given in Appendix I. Litter has 3 and 6 times more N compared to coal on mass and heat basis. The P of litter is almost 2 % (Task 1). Both litter biomass (LB) and feedlot biomass (FB) have been pulverized. The size distributions are similar for both litter and FB in that 75 % pass through 150 {micro}m sieve while for coal 75 % pass through 60 {micro}m sieve. Rosin Rammler curve parameters are given. The TGA characteristics of FB and LB are similar and pyrolysis starts at 100 C below that of coal; (2) Reburn experiments with litter and with FB have been performed (Appendix II) -Task 2. Litter is almost twice effective (almost 70--90 % reduction) compared to coal in reducing …
Date:
May 10, 2001
Creator:
Annamalai, Dr. Kalyan; Sweeten, Dr. John & Mukhtar, Dr. Sayeed
Object Type:
Report
System:
The UNT Digital Library