Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network™

Open Access. Powered by Scholars. Published by Universities.®

Missouri University of Science and Technology

Discipline
Keyword
Publication Year
Publication
Publication Type
File Type

Articles 25561 - 25590 of 33645

Full-Text Articles in Entire DC Network

Optical Filtering Element, Gary Edward Mueller, Timothy D. Ziebarth Jan 1982

Optical Filtering Element, Gary Edward Mueller, Timothy D. Ziebarth

Nuclear Engineering and Radiation Science Faculty Research & Creative Works

Optical filtering elements having two opposed surfaces and including at least one thin layer of stable non-reflective fluorescent material provide transparent articles which, when exposed to incident electromagnetic radiation at one surface of the fluorescent layer, absorb certain wavelengths within the fluorescent layer and emit other wavelengths at the opposed surface of the fluorescent layer. In preferred embodiments, when radiation (light) in the visible range (about 400 nm to about 700 nm) is incident on the element from one side, certain wavelengths of radiation which transverse the element are absorbed in the fluorescent layer and other radiation of greater, but …


Optical Filtering Element Including Fluorescent Material, Gary Edward Mueller Jan 1982

Optical Filtering Element Including Fluorescent Material, Gary Edward Mueller

Nuclear Engineering and Radiation Science Faculty Research & Creative Works

Optical filtering elements having two opposed surfaces and including at least one thin layer of stable non-reflective fluorescent material provide transparent articles which, when exposed to incident electromagnetic radiation at one surface of the fluorescent layer, absorb certain wavelengths within the fluorescent layer and emit other wavelengths at the opposed surface of the fluorescent layer. In preferred embodiments, when radiation (light) in the visible range (about 400 nm to about 700 nm) is incident on the element from one side, certain wavelengths of radiation which transverse the element are absorbed in the fluorescent layer and other radiation of greater, but …


Deposition Of Cdte By Spray Pyrolysis, Jack L. Boone, Thomas P. Van Doren, Alok K. Berry Jan 1982

Deposition Of Cdte By Spray Pyrolysis, Jack L. Boone, Thomas P. Van Doren, Alok K. Berry

Electrical and Computer Engineering Faculty Research & Creative Works

We report the spray pyrolysis of thin films of CdTe which show promise as a base material for solar cell applications. The films predominately show a zinc blende structure and appear to be intrinsic. Microprobe analysis indicates an excess of cadmium but this is not detectable by X-ray diffraction or from electrical conduction measurements. Measurements indicate a nominal direct bandgap of 1.47 eV and an absorption coefficient of the order of 104 cm−1. The room temperature electrical resistivity is of the order of 107 Ω cm.


An Optimal Control Law By Eigenvalue Assignment For Improved Dynamic Stability In Power Systems, A. B.R. Kumar, Earl F. Richards Jan 1982

An Optimal Control Law By Eigenvalue Assignment For Improved Dynamic Stability In Power Systems, A. B.R. Kumar, Earl F. Richards

Electrical and Computer Engineering Faculty Research & Creative Works

No abstract provided.


An Optimal Control Law By Eigenvalue Assignment For Improved Dynamic Stability In Power Systems, A. B.R. Kumar, Earl F. Richards Jan 1982

An Optimal Control Law By Eigenvalue Assignment For Improved Dynamic Stability In Power Systems, A. B.R. Kumar, Earl F. Richards

Electrical and Computer Engineering Faculty Research & Creative Works

Whenever control laws are computed on the basis of linear optimal control theory and implemented on non-linear systems, such as power systems, the performance is not as good as expected because of saturation type non-linearities in the system components. The only way to ensure that a control law is adequate, short of actually testing the real system, is to observe the simulated behavior of the system. Departure between a calculated linear control law and the actual response can be minimized by (a) computing a feedback control law with gains of small magnitudes to achieve a pre-assigned set of eigenvalues for …


Conversion And Matched Filter Approximations For Serial Minimum-Shift Keyed Modulation, Carl R. Ryan, James H. Stilwell, Rodger E. Ziemer Jan 1982

Conversion And Matched Filter Approximations For Serial Minimum-Shift Keyed Modulation, Carl R. Ryan, James H. Stilwell, Rodger E. Ziemer

Electrical and Computer Engineering Faculty Research & Creative Works

Serial minimum-shift keyed (MSK) modulation, a technique for generating and detecting MSK using series filtering, is ideally suited for high data rate applications provided the required conversion and matched filters can be closely approximated. Low-pass implementations of these filters as parallel inphase-and quadrature-mixer structures are characterized in this paper in terms of signal-to-noise ratio (SNR) degradation from ideal and envelope deviation. Several hardware implementation techniques utilizing microwave devices or lumped elements are presented. Optimization of parameter values results in realizations whose SNR degradation is less than 0.5 dB at error probabilities of 10-6. © 1982 IEEE


Development Of A Friction Element For Metal Forming Analysis, W. D. Webster, Robert L. Davis Jan 1982

Development Of A Friction Element For Metal Forming Analysis, W. D. Webster, Robert L. Davis

Mechanical and Aerospace Engineering Faculty Research & Creative Works

A three-dimensional finite element friction element has been developed. The friction element has been used in the analysis of round-to-square forward extrusion.Comparison with some limited experimental data is presented. © 1982 by ASME.


A Mathematical Model Used In Conjunction With A Finite Element Analysis To Aid In The Design And Analysis Of Bourdon Tubes, R. C. Weber, Robert L. Davis Jan 1982

A Mathematical Model Used In Conjunction With A Finite Element Analysis To Aid In The Design And Analysis Of Bourdon Tubes, R. C. Weber, Robert L. Davis

Mechanical and Aerospace Engineering Faculty Research & Creative Works

A mathematical model that describes a variety of Bourdon tube geometries has been used for the three-dimensional analysis of Bourdon tubes. The variation of the stresses and tip deflections with respect to the variables used in the mathematical model are then presented as an aid in the design and analysis of the Bourdon tube. The finite element program represents a user-orientated package for calculation of tip deflections and stresses. Stresses and deflections are compared to both strain gage data and instrumented tip deflections as well as published data to establish the credibility of both the model and computer program. © …


2-Thiabicyclo[3.2.0]Hepta-3,6-Dienes. 1. Aluminum Chloride Catalyzed Thermal [2 + 2] Cycloaddition Of 2-Butynedinitrile With Alkyl-Substituted Thiophenes, Richard H. Hall, Herman J. Den Hertog, David N. Reinhoudt Jan 1982

2-Thiabicyclo[3.2.0]Hepta-3,6-Dienes. 1. Aluminum Chloride Catalyzed Thermal [2 + 2] Cycloaddition Of 2-Butynedinitrile With Alkyl-Substituted Thiophenes, Richard H. Hall, Herman J. Den Hertog, David N. Reinhoudt

Business and Information Technology Faculty Research & Creative Works

Tetra- and Trialkylthiophenes 4–6 React with 2-Butynedinitrile in the Presence of 1 Equiv of Aluminum Chloride in Dichloromethane at 0 °C Via [2 + 2] Cycloaddition to 2-3.2.0] hepta-3,6-Diene-6,7-Dicarbonitriles 7–10 as the Major Products. Reaction of 4 and 5 Also Gave Small Amounts (4% and 6%) of 1,2-Benzenedicarbonitriles 11 and 12 Which Result from [4 + 2] Cycloaddition and Subsequent Extrusion of Sulfur. 4,5,6,7-Tetrahydro-1,3-Dimethylbenzo[C]thiophene (6) Reacts with 2-Butynedinitrile under the Same Conditions to Give an "Ene" Adduct (13) in Addition to the [2 + 2] Cycloadduct 10. 2,5-Dimethylthiophene (3) Gave a 2:1 Reaction Product 14, the Formation of Which Can …


2-Thiabicyclo[3.2.0]Hepta-3,6-Dienes. 2. Thermal And Photochemical Isomerization Of 2-Thiabicyclo[3.2.0]Hepta-3,6-Dienes. An Example Of The Antarafacial-Antarafacial Cope Rearrangement, Richard H. Hall, Herman J. Den Hertog, David N. Reinhoudt Jan 1982

2-Thiabicyclo[3.2.0]Hepta-3,6-Dienes. 2. Thermal And Photochemical Isomerization Of 2-Thiabicyclo[3.2.0]Hepta-3,6-Dienes. An Example Of The Antarafacial-Antarafacial Cope Rearrangement, Richard H. Hall, Herman J. Den Hertog, David N. Reinhoudt

Business and Information Technology Faculty Research & Creative Works

Thermal Rearrangement of 2-3.2.0] hepta-3,6-Diene-6,7-Dicarbonitrile8 1–3 to their 4,5-Dicarbonitrile Isomers 4–6 Takes Place at 110–140 °C in Yields of 82–84%. the Reactions Are First Order with Rates Almost Independent of the Polarity of the Solvent. Activation Parameters (ΔH‡ = 120–140 KJ Mol−1 and ΔS‡ ≈ 0 J K−1 Mol−1) Are in Agreement with a Concerted Symmetry-Allowed Antarafacial-Antarafacial Cope Rearrangement. Compounds 1–3 Rearrange Photochemically Via Cleavage of the C-1-S Bond to the 1,7-Dicarbonitrile Isomers 7–9. Isomer 9 Rearranges Further on Prolonged Irradiation to Give 10. a Tentative Mechanism for This Rearrangement is Given. © 1982, American Chemical Society. All Rights Reserved.


2-Thiabicyclo[3.2.0]Hepta-3,6-Dienes. 3. Desulfuration And Sulfuration Of 2-Thiabicyclo[3.2.0]Hepta-3,6-Dienes And X-Ray Crystal Structure Of 3a,6,7,8,9,9a-Hexahydro-3a,5-Dimethylthieno[3,2-B][2]Benzothiophene-2,3-Dicarbonitrile, Richard H. Hall, Herman J. Den Hertog, David N. Reinhoudt, Sybolt Harkema, Gerrit J. Van Hummel, Jos W.H.M. Uiterwijk Jan 1982

2-Thiabicyclo[3.2.0]Hepta-3,6-Dienes. 3. Desulfuration And Sulfuration Of 2-Thiabicyclo[3.2.0]Hepta-3,6-Dienes And X-Ray Crystal Structure Of 3a,6,7,8,9,9a-Hexahydro-3a,5-Dimethylthieno[3,2-B][2]Benzothiophene-2,3-Dicarbonitrile, Richard H. Hall, Herman J. Den Hertog, David N. Reinhoudt, Sybolt Harkema, Gerrit J. Van Hummel, Jos W.H.M. Uiterwijk

Business and Information Technology Faculty Research & Creative Works

The 2-3.2.0] hepta-3,6-Dienes 1–7 Extrude Sulfur in Solution at 285 °C to Give the 1,2-Benzenedicarbonitriles 8–12 in Yields of 42–56%. 5-(1,1-Dimethylethyl)-3,6-Dimethyl-2-3.2.0] hepta-3,6-Diene-1,7-Dicarbonitrile (6) Reacts at 140 °C to Give a Mixture of the Cope-Rearranged Isomer 13, the 1,2-Benzenedicarbonitrile 11, and possibly a 3a,6a-Dihydrothieno[3,2-B] thiophene (14). Reaction of 2a,5,6,7,8,8a-Hexahydro-2a,4-Dimethylbenzo[C]cyclobuta[B]thiophene-L,2-Dicarbonitrile (15) at 140 °C Gives a Mixture of De8ulfurated (16) and Sulfureted (17) Products in Yields of 88% and 70%, Respectively. Single-Crystal X-Ray Analysis Proved the 3a,6,7,8,9,9a-Hexahydrothieno[3,2-B][2]benzothiophene Structure (17). the Possible Mechanism of the Insertion of Sulfur in the Carbon-Carbon Single Bond of 15 is Discussed. © 1982, American Chemical Society. All …


An Approximation Theory For Conjugate Surfaces And Solutions Of Elliptic Multiple Integral Problems: Application To Numerical Solutions Of Generalized Laplace's Equation, John Gregory, Ralph W. Wilkerson Jan 1982

An Approximation Theory For Conjugate Surfaces And Solutions Of Elliptic Multiple Integral Problems: Application To Numerical Solutions Of Generalized Laplace's Equation, John Gregory, Ralph W. Wilkerson

Computer Science Faculty Research & Creative Works

An Approximation Theory is Given for a Class of Elliptic Quadratic Forms Which Include the Study of Conjugate Surfaces for Elliptic Multiple Integral Problems. These Ideas Follow from the Quadratic Form Theory of Hestenes, Applied to Multiple Integral Problems by Dennemeyer, and Extended with Applications for Approximation Problems by Gregory. the Application of This Theory to a Variety of Approximation Problem Areas in This Setting is Given. These Include Conjugate Surfaces and Conjugate Solutions in the Calculus of Variations, Oscillation Problems for Elliptic Partial Differential Equations, Eigenvalue Problems for Compact Operators, Numerical Approximation Problems, And, Finally, the Intersection of These …


Origin Of The Term 'Shyster', Gerald Leonard Cohen Jan 1982

Origin Of The Term 'Shyster', Gerald Leonard Cohen

Arts, Languages and Philosophy Faculty Research & Creative Works

Shyster has been one of the most difficult items for etymologists of English, but a Rosetta Stone to its origin exists: the previously overlooked 1843-1844 material in a New York City newspaper. This material contains an all-important conversation on shyster at the moment of its inception and permits the unearthing of the detailed story behind this term; very briefly, shyster arose as part of the editor's crusade against legal and political corruption in NYC and the attempts of the authorities to silence him. The present monograph discusses the earlier unsuccessful attempts to find the term's etymology and then sets forth …


Applying Software Complexity Metrics To Program Maintenance, Kenneth Magel, Raymond Michael Kluczny, Warren A. Harrison, Arlan R. Dekock Jan 1982

Applying Software Complexity Metrics To Program Maintenance, Kenneth Magel, Raymond Michael Kluczny, Warren A. Harrison, Arlan R. Dekock

Business and Information Technology Faculty Research & Creative Works

No abstract provided.


Preparation Of Cationic Polymer Surfaces By Grafting Polymerization, H. Yasuda, B. Sherry, M. A. Ei‐Nokaly, Stig Friberg Jan 1982

Preparation Of Cationic Polymer Surfaces By Grafting Polymerization, H. Yasuda, B. Sherry, M. A. Ei‐Nokaly, Stig Friberg

Chemistry Faculty Research & Creative Works

A cationic polymer surface with extensive capacity for adsorption of anionic surfactants was prepared by graft polymerization of vinyl pyridine onto a plasma‐treated polypropylene surface. The nitrogen was quaternized in order to obtain the cationic sites. The concentration dependence of adsorption from high eletrolyte solution of the anionic surfactant was similar to the one a solid surface from solutions with no added electrolyte. The hydrophobic contribution to the adsorption was experienced at surfactant concentrations far below its critical micellization. Copyright © 1982 John Wiley & Sons, Inc.


Biomedical Applications Of Plasma Polymerization And Plasma Treatment Of Polymer Surfaces, H. Yasuda, M. Gazicki Jan 1982

Biomedical Applications Of Plasma Polymerization And Plasma Treatment Of Polymer Surfaces, H. Yasuda, M. Gazicki

Chemistry Faculty Research & Creative Works

Thin polymer films obtained by plasma polymerization usually show good biocompatibility when compared to classical biomaterials such as Silastic. The thicknesses of these films (from several hundreds of Å to several μm) make them suitable for the purpose of changing the surface properties of the substrate without altering its bulk properties. Both the above features together indicate the possible Biomedical use of plasma polymerization as well as plasma treatment of polymer surfaces processes. The purpose of this review is to present the most significant efforts to develop such applications with the specification of particular fields where these efforts are directed. …


Measurement Of The Wear Properties Of Metallic Solids With A Falex Lubricant Testing Machine, Edward Boyd Hale, Chun-Ping John Meng, Ronald A. Kohser Jan 1982

Measurement Of The Wear Properties Of Metallic Solids With A Falex Lubricant Testing Machine, Edward Boyd Hale, Chun-Ping John Meng, Ronald A. Kohser

Physics Faculty Research & Creative Works

A modified Falex Lubricant Testing Machine has been used to determine wear properties of metallic solids. In particular, wear mass loss, wear volume loss, wear rates, and other parameters have been determined for a basic steel, as heat treated and after ion implantation. Wear rate improvements of more than an order of magnitude were found in a nickel-chrome steel (SAE 3135) implanted with 2.5x1017 N+2/cm2. Wear tests were conducted with a cylinder-in-groove geometry in a mild lubricating oil with loads greater than 540 N, which corresponded to pressures which exceeded 108N/m2 …


Effects Of Varying Oxygen Partial Pressure On Molten Silicon-Ceramic Substrate Interactions, And Oxygen Partial Pressure Measurements Of Silicon Sheet Production Facilities, P. D. Ownby, Harold V. Romero Jan 1982

Effects Of Varying Oxygen Partial Pressure On Molten Silicon-Ceramic Substrate Interactions, And Oxygen Partial Pressure Measurements Of Silicon Sheet Production Facilities, P. D. Ownby, Harold V. Romero

Materials Science and Engineering Faculty Research & Creative Works

No abstract provided.


The Missouri Miner, December 10, 1981 Dec 1981

The Missouri Miner, December 10, 1981

The Missouri Miner Newspaper

No abstract provided.


The Missouri Miner, December 03, 1981 Dec 1981

The Missouri Miner, December 03, 1981

The Missouri Miner Newspaper

No abstract provided.


Precision Expansion Cloud Chamber For Homogeneous Nucleation Studies, John L. Schmitt Dec 1981

Precision Expansion Cloud Chamber For Homogeneous Nucleation Studies, John L. Schmitt

Physics Faculty Research & Creative Works

The author describes an expansion cloud chamber for the study of the nucleation of a single component vapor (homogeneous nucleation). The design draws on the many years of experience in this Center in construction of chambers for homogeneous nucleation of water. Design features of the chamber are exact control of temperature (±0.03° C), pressure (±0.5 mm Hg), and automatic control of cycling. Construction features are all construction materials are stainless steel, glass, or fluorocarbon plastics; the piston seal is a very flexible welded stainless-steel bellows; the chamber can be made very clean by heating under vacuum, and it is compatible …


Missouri S&T Magazine, December 1981, Miner Alumni Association Dec 1981

Missouri S&T Magazine, December 1981, Miner Alumni Association

Missouri S&T Magazine

No abstract provided.


Crystal Perfection Of Hgi2 Studied By Neutron And Gamma-Ray Diffraction, W. (William) B. Yelon, R. W. Alkire, M. M. Schieber, L. Van Den Berg, S. E. Rasmussen, H. Christensen, J. R. Schneider Dec 1981

Crystal Perfection Of Hgi2 Studied By Neutron And Gamma-Ray Diffraction, W. (William) B. Yelon, R. W. Alkire, M. M. Schieber, L. Van Den Berg, S. E. Rasmussen, H. Christensen, J. R. Schneider

Physics Faculty Research & Creative Works

The crystalline perfection of wire sawn pieces of vapor grown single crystals of mercuric iodide was compared with the perfection of (00l) cleaved sections of the same crystal from which nuclear radiation detectors have been fabricated. The crystalline perfection was studied using neutron and gamma-ray diffraction rocking curves. Most of the gamma-ray data were obtained using a high intensity source of 153Sm gamma rays with a wavelength of λ = 0.12 Å. Some of the data were obtained using highly penetrating 198Au gamma rays with a shorter wavelength of λ = 0.03 Å. The neutrons had a wavelength of λ …


Photoluminescence In Spray-Pyrolyzed Cdte, Bernard J. Feldman, J. (Jack) L. Boone, T. (Thomas) Van Doren Dec 1981

Photoluminescence In Spray-Pyrolyzed Cdte, Bernard J. Feldman, J. (Jack) L. Boone, T. (Thomas) Van Doren

Electrical and Computer Engineering Faculty Research & Creative Works

We report very intense photoluminescence in spray-pyrolyzed CdTe at 77 K. We also notice striking similarities in the luminescence spectra, decay, and temperature dependence between CdTe and other thin-film semiconductors, which we interpret in terms of recombination at defect sites in intergranular regions.


Hot-Wire Anemometer Behaviour In Low Velocity Air Flow, P. J. Christman, Josef Podzimek Dec 1981

Hot-Wire Anemometer Behaviour In Low Velocity Air Flow, P. J. Christman, Josef Podzimek

Physics Faculty Research & Creative Works

The behavior characteristics of a commercially available hot-wire anemometer have been examined in the presence of low velocities, lwss than 0.1 m/s for the most part, and in both horizontal and vertical air flows. The orientation of the probe in a horizontal flow has been found to have a definite effect on velocity measurements, and a lower limit to the reliable application of hot-wire anemometry has been evaluated for a particular type of probe. Vertical flow measurements have resulted in the discovery of the magnitude of natural convective velocity, and a possible method for determining the dimensions of the temperature …


The Missouri Miner, November, 19, 1981 Nov 1981

The Missouri Miner, November, 19, 1981

The Missouri Miner Newspaper

No abstract provided.


The Missouri Miner, November 12, 1981 Nov 1981

The Missouri Miner, November 12, 1981

The Missouri Miner Newspaper

No abstract provided.


The Missouri Miner, November 05, 1981 Nov 1981

The Missouri Miner, November 05, 1981

The Missouri Miner Newspaper

No abstract provided.


Eighth Annual Umr_Dnr Conference On Energy Proceedings, Multiple Authors Nov 1981

Eighth Annual Umr_Dnr Conference On Energy Proceedings, Multiple Authors

UMR-DNR Conference on Energy

No abstract provided.


Electrodeposition Of Photovolatic Cdte Films, Thomas P. Van Doren, Jack L. Boone, R. Engelken, Z. Maczenski Nov 1981

Electrodeposition Of Photovolatic Cdte Films, Thomas P. Van Doren, Jack L. Boone, R. Engelken, Z. Maczenski

UMR-DNR Conference on Energy

No abstract provided.