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Articles 19501 - 19530 of 21925
Full-Text Articles in Entire DC Network
National Transportation Priorities And The 1991 Federal Highway Program Proposals, Eugene Mccormick
National Transportation Priorities And The 1991 Federal Highway Program Proposals, Eugene Mccormick
Purdue Road School
No abstract provided.
Preface, Purdue Road School
If You're Not Managing Your Department, Then Who Is?, Kent O. Lande
If You're Not Managing Your Department, Then Who Is?, Kent O. Lande
Purdue Road School
No abstract provided.
Indiana's Goals On Cost-Effective Delivery Of Transportation Services, Christine Letts
Indiana's Goals On Cost-Effective Delivery Of Transportation Services, Christine Letts
Purdue Road School
No abstract provided.
Front Matter, Purdue Road School
Shape Recovery From Robot Contour Tracking With Force Feedback, Shaheen Ahmad, Chuan N. Lee
Shape Recovery From Robot Contour Tracking With Force Feedback, Shaheen Ahmad, Chuan N. Lee
Department of Electrical and Computer Engineering Technical Reports
In this paper we describe a process for shape recovery from robot contour-tracking operations with force feedback. Shape recovery is an important task for self-teaching robots and for exploratory operations in unknown environments. An algorithm which directs a position controlled robot around an unknown planar contour using the steady state contact force information is described in this paper. The shape recovery from the planar contouring is not a trivial problem. It is experimentally found that there is significant distortion of the original contour if direct kinematics is used to recover the object’s shape, as we are unable to recover the …
Father’S Care – Involvement, Influence, And Affection: Three Keys To Father-Child Relationships, Charles A. Smith
Father’S Care – Involvement, Influence, And Affection: Three Keys To Father-Child Relationships, Charles A. Smith
Historical Documents of the Purdue Cooperative Extension Service Archive
Though they may sometimes find it difficult to express their feelings, most fathers care about their children and families. In a 1980 Gallup poll, six out of ten fathers said their families were “the most important element of my life at this time.” Only 8 percent said their families were unimportant to them. When asked what they found most satisfying about their families, fathers rated “children,” “closeness,” and “being together” as personally important.
Supporting Queries In The O-Raid Object-Oriented Database System, James G. Mullen, Jagannathan Srinivasan, Prasun Dewan, Bharat Bhargava
Supporting Queries In The O-Raid Object-Oriented Database System, James G. Mullen, Jagannathan Srinivasan, Prasun Dewan, Bharat Bhargava
Department of Computer Science Technical Reports
No abstract provided.
The Uniform Soybean Tests: Northern States 1990, J. R. Wilcox
The Uniform Soybean Tests: Northern States 1990, J. R. Wilcox
Uniform Soybean Tests Northern Region
No abstract provided.
1990 Directory Of Indiana State, County, City And Town Officials Responsible For Road And Street Work, Herpicc
Indiana Local Technical Assistance Program (LTAP) Directory
Contact information for agency officials and employees responsible for Indiana’s local road infrastructure.
Administration And Management Of Local Streets And Roads (1990 Update)—Chapter 8 Road Revenues, Herpicc
Administration And Management Of Local Streets And Roads (1990 Update)—Chapter 8 Road Revenues, Herpicc
Indiana Local Technical Assistance Program (LTAP) Publications
Funding highway, road and street work is a never-ending challenge. Local officials must be aware of the numerous sources of funds and the procedures involved in the acquisition and distribution of these dollars to local levels of government. Sources of funds are discussed. Answers to a number of road revenue questions are provided.
New Chemical Alternative Refrigerants, J. L. Adcock, S. B. Mathur, W. A. Van Hook, B. H. Wang
New Chemical Alternative Refrigerants, J. L. Adcock, S. B. Mathur, W. A. Van Hook, B. H. Wang
International Refrigeration and Air Conditioning Conference
No abstract provided.
Thermophysical Properties Of Some Selected Alternative Refrigerants, L. A. Weber
Thermophysical Properties Of Some Selected Alternative Refrigerants, L. A. Weber
International Refrigeration and Air Conditioning Conference
No abstract provided.
Projet De Recherche Agricole Appliquée Au Niger (Contrat Aid 683-0256-C-00-8024-00) Rapport De Mission D'Assistance Technique, E. Stewart Saunders
Projet De Recherche Agricole Appliquée Au Niger (Contrat Aid 683-0256-C-00-8024-00) Rapport De Mission D'Assistance Technique, E. Stewart Saunders
Libraries Faculty and Staff Supplemental Materials
Evaluation et recommendations pour les centres de documentation de l'Institut National de Recherche Agronomique du Niger effectués en 1990.
Niger Applied Agricultural Research Project. Contract Aid 683-0256-C-00-8024-00. Consultancy Report., E. Stewart Saunders
Niger Applied Agricultural Research Project. Contract Aid 683-0256-C-00-8024-00. Consultancy Report., E. Stewart Saunders
Libraries Faculty and Staff Supplemental Materials
Evaluation and recommendations for the documentation centers of the Institut National de Recherche Agronomique du Niger carried out in 1990.
Simulation Of Free Radical Reactions In Biology And Medicine: A New Two-Compartment Kinetic Model Of Intracellular Lipid Peroxidation, Charles F. Babbs, Melissa Gale Steiner
Simulation Of Free Radical Reactions In Biology And Medicine: A New Two-Compartment Kinetic Model Of Intracellular Lipid Peroxidation, Charles F. Babbs, Melissa Gale Steiner
Weldon School of Biomedical Engineering Faculty Publications
To explore mechanisms of free radical reactions leading to intracellular lipid peroxidation in living systems, we developed a computational model of up to 109 simultaneous enzymatic and free radical reactions thought to be involved in the initiation, propagation, and termination of membrane lipid peroxidation. Rate constants for the various reactions were obtained from the published literature. The simulation model included a lipid membrane compartment and an aqueous cytosolic compartment, between which various chemical species were partitioned. Lipid peroxidation was initiated by the iron-catalyzed, superoxide-driven Fenton reaction. A "C"-language computer program implemented numerical solution of the steady-state rate equations for concentrations …
Transistor-Based Measurements Of Electron Injection Currents In P-Type Gaas Doped 1018–1020 Cm-3, M. E. Klausmeier-Brown, M. R. Melloch, Mark S. Lundstrom
Transistor-Based Measurements Of Electron Injection Currents In P-Type Gaas Doped 1018–1020 Cm-3, M. E. Klausmeier-Brown, M. R. Melloch, Mark S. Lundstrom
Department of Electrical and Computer Engineering Faculty Publications
Measurements of electron currents injected into p+‐GaAs are presented for molecular beam epitaxially grown material doped from 2×1018 to 8×1019 cm−3 with Be. The collector current versus base‐emitter voltage characteristics of n‐p+‐n GaAs homojunction bipolar transistors are analyzed, and the results are interpreted in terms of the quantity (n0Dn), where n0 is the equilibrium minority‐carrier concentration and Dn is the minority‐carrier diffusion coefficient. The results are consistent with earlier measurements of (n0Dn) made using metalorganic chemical vapor deposited p+‐n GaAs solar …
High‐Efficiency Al0.22ga0.78as Solar Cells Grown By Molecular Beam Epitaxy, Michael R. Melloch, S. P. Tobin, C. Bajgar, A. Keshavarzi, T. B. Stellwag, G. B. Lush, Mark S. Lundstrom, K. Emery
High‐Efficiency Al0.22ga0.78as Solar Cells Grown By Molecular Beam Epitaxy, Michael R. Melloch, S. P. Tobin, C. Bajgar, A. Keshavarzi, T. B. Stellwag, G. B. Lush, Mark S. Lundstrom, K. Emery
Department of Electrical and Computer Engineering Faculty Publications
The quality of pn junction photodetectors made of Al0.2Ga0.8As has been investigated as a first step in the optimization of tandem solar cells. We have obtained 1 sun AM1.5 efficiencies of 16.1% for 0.25 cm2 Al0.22Ga0.78As solar cellsfabricated from molecular beam epitaxy (MBE) material. This efficiency is 3.2 percentage points higher than the previously best reported efficiency of 12.9% for an Al0.2Ga0.8As solar cell fabricated from MBE material.
Distributed And Non-Steadv State Modelling Of An Air Cooler, H. W. Wang, S. Touber
Distributed And Non-Steadv State Modelling Of An Air Cooler, H. W. Wang, S. Touber
International Refrigeration and Air Conditioning Conference
No abstract provided.
Opening Address, Worldwide Compressor Engineering Conference, Purdue University, 17-19 July, 1990, F. V. Honnold
Opening Address, Worldwide Compressor Engineering Conference, Purdue University, 17-19 July, 1990, F. V. Honnold
International Compressor Engineering Conference
No abstract provided.
Automatic Parallelization Of Database Queries, Myong H. Kang, Henry G. Dietz
Automatic Parallelization Of Database Queries, Myong H. Kang, Henry G. Dietz
Department of Electrical and Computer Engineering Technical Reports
Although automatic parallelization of conventional language programs is now widely accepted, relatively little emphasis has been placed on automatic parallelization of database query programs (sometimes referred to as “multiple queries” ). In this paper, we discuss the unique problems associated with automatic parallelization of database programs. From this discussion, we derive a complete approach to automatic parallelization of database programs. Beside integrating a number of existing techniques, our approach relies heavily on several new concepts, including the concepts of “algorithm-level” analysis and hybrid static/dynamic scheduling.
The R-134a Energy Efficiency Problem: Factor Fiction, N. Behrens, T. W. Dekleva, J. G. Hartley, F. T. Murphy, R. L. Powell
The R-134a Energy Efficiency Problem: Factor Fiction, N. Behrens, T. W. Dekleva, J. G. Hartley, F. T. Murphy, R. L. Powell
International Refrigeration and Air Conditioning Conference
No abstract provided.
Free Radicals And The Etiology Of Colon Cancer, Charles F. Babbs
Free Radicals And The Etiology Of Colon Cancer, Charles F. Babbs
Weldon School of Biomedical Engineering Faculty Publications
This hypothesis paper reviews diverse evidence suggesting that intracolonic production of oxygen radicals may play a role in carcinogenesis. The hypothesis began to evolve when the author made the chance discovery that 1/10,000 dilutions of feces generated detectable quantities of highly reactive hydroxyl radicals (HO). The rate of HO formation, detected using DMSO as a molecular probe, was quite remarkable, corresponding to that which would be produced by over 10,000 rads of gamma irradiation per day, absorbed in the periphery of the fecal mass adjacent to the mucosa. The relatively high concentrations of iron in feces, together with the ability …
Accuracy And Precision Of Computer-Simulated Tissue Temperatures In Individual Human Intracranial Tumours Treated With Interstitial Hyperthermia, J A. Deford, Charles F. Babbs, U H. Patel, N E. Fearnot, J A. Marchosky, C J. Moran
Accuracy And Precision Of Computer-Simulated Tissue Temperatures In Individual Human Intracranial Tumours Treated With Interstitial Hyperthermia, J A. Deford, Charles F. Babbs, U H. Patel, N E. Fearnot, J A. Marchosky, C J. Moran
Weldon School of Biomedical Engineering Faculty Publications
Accurate knowledge of tissue temperature is necessary for effective delivery of clinical hyperthermia in the treatment of malignant tumours. This report compares computer-predicted versus measured intratumoral temperatures in 11 human subjects with intracranial tumours, treated with a conceptually simple 'conductive' interstitial hyperthermia system. Interstitial hyperthermia was achieved by the use of parallel arrays of implanted, electrically heated catheters. The tissue was warmed by thermal conduction and blood convection. Simulation of intratumoral temperatures was achieved by solving a modified bioheat transfer equation on a digital computer using a finite difference method. Comparison of intratumoral temperatures from simulations and measured values differed …
Surface Passivation Effects Of As2s3 Glass On Self‐Aligned Algaas/Gaas Heterojunction Bipolar Transistors, H. L. Chuang, M. S. Carpenter, Michael R. Melloch, Mark S. Lundstrom, E. Yablonovitch, T. J. Gmitter
Surface Passivation Effects Of As2s3 Glass On Self‐Aligned Algaas/Gaas Heterojunction Bipolar Transistors, H. L. Chuang, M. S. Carpenter, Michael R. Melloch, Mark S. Lundstrom, E. Yablonovitch, T. J. Gmitter
Department of Electrical and Computer Engineering Faculty Publications
A recently developed As2S3 chemical treatment was used to passivate the perimeters of self‐aligned heterojunction bipolar transistors (HBTs). The As2S3chemical treatment significantly lowered the base current resulting in a two order of magnitude reduction in the collector current density at which dc current gain was observed (β=1). No degradation with time has been observed in the electrical characteristics of the chemically treated HBTs. This absence of degradation is attributed to the impermeability to oxygen of the As2S3 glass which coats the perimeter of the HBT after chemical treatment.
Orientation-Dependent Perimeter Recombination In Gaas Diodes, T. B. Stellwag, Michael R. Melloch, Mark S. Lundstrom, M. S. Carpenter, R. F. Pierret
Orientation-Dependent Perimeter Recombination In Gaas Diodes, T. B. Stellwag, Michael R. Melloch, Mark S. Lundstrom, M. S. Carpenter, R. F. Pierret
Department of Electrical and Computer Engineering Faculty Publications
Perimeter recombination currents affect the performance of GaAs-based devices such as solar cells, heterojunction bipolar transistors, and injection lasers. We report that the n SEf 2 perimeter recombination current has a strong orientation dependence. More than a factor of five variation in the surface recombination current at mesa-etched edges has been observed. These results suggest that with proper device design, perimeter recombination currents could be substantially reduced.
Heat Transfer And Fluid Flow Considerations In Automatic Valves Of Reciprocating Compressors, A. T. Prata, R. T. S. Ferreira
Heat Transfer And Fluid Flow Considerations In Automatic Valves Of Reciprocating Compressors, A. T. Prata, R. T. S. Ferreira
International Compressor Engineering Conference
No abstract provided.
The Flow Work Compressor, J. F. Weinbrecht
The Flow Work Compressor, J. F. Weinbrecht
International Compressor Engineering Conference
No abstract provided.
Cfc Alternatives: Recent Information Concerning Costs And Efficiency, T. G. Statt
Cfc Alternatives: Recent Information Concerning Costs And Efficiency, T. G. Statt
International Refrigeration and Air Conditioning Conference
No abstract provided.
Organization For Applied Scientific Research Tno, The Netherlands, "Alternative, Environmentally Acceptable Refrigerating Cycles: A Solution For The Cfc Issue?, R. J. M. Van Gerwen
Organization For Applied Scientific Research Tno, The Netherlands, "Alternative, Environmentally Acceptable Refrigerating Cycles: A Solution For The Cfc Issue?, R. J. M. Van Gerwen
International Refrigeration and Air Conditioning Conference
No abstract provided.