Digital Commons Network^™

The Magnification Factor For Sodium Chloride Liesegang Circles Established With An Aerosol Centrifuge, O. Preining, Josef Podzimek, P. Yue

Physics Faculty Research & Creative Works

Sodium chloride particles deposited on a gelatin film containing silver nitrate form in a humid environment clearly visible dark brown reaction spots (Liesegang circles) after development in u.v.-light. The size of these reaction spots depends on the mass of NaCl in the particles. To establish the spot size vs particle size relation, particles produced by nebulising NaCl-solutions and sea water were sampled in an aerosol centrifuge. The location of deposition yields the aerodynamic diameter of the particle, and the spot size is measured microscopically. In this way the spot size vs aerodynamic diameter relation is established experimentally in the so …

Mass Transfer To Drops Moving Through Power Law Fluids In The Intermediate Reynolds Number Region, Robert M. Wellek, Türker Gürkan

Chemical and Biochemical Engineering Faculty Research & Creative Works

The mass transfer rate to fluid spheres is calculated for power law and Newtonian fluids by using the intermediate Reynolds number stream functions of Nakano and Tien (1970) and Yamaguchi et al. (1974), respectively. The Sh increases with increases in Re and Pe and decreases in n. Better results are obtained with Nakano and Tien's functions when Re > 10 and with Yamaguchi's functions when Re < 10. Copyright © 1976 American Institute of Chemical Engineers

Process Optimization By Flow Sheet Simulation, L. D. Gaines, J. L. Gaddy

Chemical and Biochemical Engineering Faculty Research & Creative Works

Optimization of large or complex chemical processes often requires simplifying the system to reduce the mathematics to a form manageable by available algorithms or to reduce the time required to perform the computations. In many cases, such simplification alters the solution of the problem. Flow sheet simulation programs are ideally suited to the study of chemical processes, although the computational time is generally considered excessive for detailed optimization of complex systems by the usual procedures. This paper discusses the modifications needed to apply flow sheet simulation programs to the optimization of chemical processes. The advantages and disadvantages of the use …

Transition Boiling Of Normal Pentane From A Horizontal Flat Gold Surface At One Atmosphere Pressure, R. M. Canon, Efton Park

Chemical and Biochemical Engineering Faculty Research & Creative Works

No abstract provided.

The Internal Chemical Shift - A Key To Bonding In Aromatic Molecules. 2. Substituent Effects On The Carbon-13 Magnetic Resonance Spectra Of The 1,4-Disubstituted Benzenes, Donald W. Beistel, W. Dan Edwards

Chemistry Faculty Research & Creative Works

Carbon-13 magnetic resonance shifts were determined for six families of 1,4-disubstituted benzenes. Linear least-squares correlations between the internal shifts of the families suggest an additivity relationship for 13C substituent effects at all four nonidentical ring carbons and at the α position when one of the substituents has a central carbon. The correlation of 1H and 13C shifts for these compounds is also linear, implying that the additivity relationships derived in a previous 1H study can be generalized to 13C.

Absorption In The Infrared Of Surface Electromagnetic Waves By Adsorbed Molecules On A Copper Surface, K. Bhasin, D. Bryan, Ralph William Alexander, Robert John Bell

Physics Faculty Research & Creative Works

Experimental Observations Have Been Made for the First Time that Surface Electromagnetic Wave (SEW) Spectroscopy Can Be Used to Measure the Infrared Spectra of Adsorbed Molecules and Very Thin Films on Metal Surfaces. using a Tunable CO2 Laser (9.2-10.8 Μm Wavelength), the 975 and the 1037 Cm-1 Resonances of 5-25 Å Thick Physiosorbed Benzene on Copper Were Observed. Broadening of These Resonances for the Thinnest Layers of Benzene Was Observed. Also SEW Spectroscopy and Ellipsometry Were Used to Study Thin Films of Cellulose Acetate (15-75 Å) on Copper. Further, It Was Shown that Film Thicknesses Determined by SEW Spectroscopy Are …

Part I. Thermodynamic Acidities Of Substituted Phenylacetylenes. Part Ii. Mercury Accumulation In Trout Of Southern Missouri, Eric T. Lloyd

Masters Theses

"PART I: THERMODYNAMIC ACIDITIES OF SUBSTITUTED PHENYLACETYLENES The thermodynamic acidities (pKa) of phenylacetylene and several para substituted phenylacetylenes in methanol were determined at 25ºC. These acidity constants were determined using a quenching technique which involves converting the phenylacetylenic anion, present at equilibrium as sodium phenylacetylide, to the tritium labelled carbon acid. By liquid scintillation counting techniques, the concentration of the anion was determined and the pKa of the phenylacetylene compound calculated. The resulting pKa's are: p-nitrophenylacetylene, 17.98, p-bromophenylacetylene, 18.10, p-fluorophenylacetylene, 18.14, phenylacetylene, 18.50, and p-methylphenylacetylene, 18.60. The effect of a substituent in the para position on the relative acidities is …

Areal Geology, Brecciation, And Mineralization In The Trout Creek Area, Park And Chaffee Counties, Colorado, Barry Plin Mercer

Masters Theses

"The principle purpose of this thesis research has been to map rock types in an area selected for its occurrence of lead-zinc mineralization, and particularly to examine the character and origin of breccias present in the Leadville Limestone. The thesis area is located in Colorado along the east flank of the southernmost Mosquito Range, bounded by Buffalo Peaks Volcanic field on the north and Trout Creek on the south. Units mapped include the Sawatch Quartzite (Cambrian), Manitou Limestone (lower Ordovician), Harding Sandstone (middle Ordovician), Fremont Limestone (upper Ordovician), Parting Quartzite (Devonian), Dyer Dolomite (Devonian), and Leadville Limestone (Mississippian). The Leadville …

Planning A Kinetic And Mechanistic Study With Cerium (Iv), Samir B. Hanna, Robert R. Kessler, André Merbach, Steve Ruzicka

Chemistry Faculty Research & Creative Works

No abstract provided.

Interpretation Of Some Of The Basic Features Of Field-Ion Image Projections From A Hemispherical To A Planar Surface Using Moire Patterns, P. D. Ownby, Robert M. Doerr, Walter Bollmann

Materials Science and Engineering Faculty Research & Creative Works

No abstract provided.

Deformation Produced By A Simple Tensile Load In An Isotropic Elastic Body, R. C. Batra

Mechanical and Aerospace Engineering Faculty Research & Creative Works

It is shown that a simple tensile load produces a simple extension provided the empirical inequalities (Truesdell and Noll [1], eqn. 51.27) hold. © 1976 Noordhoff International Publishing.

Bit Penetration Into Rock-A Finite Element Study, J. K. Wang, T. F. Lehnhoff

Mechanical and Aerospace Engineering Faculty Research & Creative Works

The sequence of rock failure mechanisms and quantitative information on stress, displacement and material failure in the process of bit penetration have been obtained through computer simulation. A finite element approach has been developed to simulate bit penetration from bit-rock interaction to chip formation. A mathematical rock failure model, based on available rock failure experiments, has been proposed to represent post-failure rock behavior and applied in the penetration simulations. The finite element code was developed for two-dimensional plane strain problems to consider non-linear material properties, geometric non-linearity, and fracture propagation. An anistropic element as well as variable stiffness and stress …

The Effects Of Main-Flow Radial Velocity On The Stability Of Developing Laminar Pipe Flow, F. C.T. Shen, T. S. Chen, L. M. Huang

Mechanical and Aerospace Engineering Faculty Research & Creative Works

In studying the stability due to axisymmetric disturbances of the developing flow of an incompressible fluid in the entrance region of a circular tube, a generalized version of the Orr-Sommerfeld equation was derived which takes account of the radial velocity component in the main flow. The new terms in the generalized Orr-Sommerfeld equation are inversely proportional to the Reynolds number. The resulting eigenvalue problem consisting of the disturbance equation and the boundary conditions was solved by a direct numerical integration scheme along with an iteration procedure. Neutral stability curves and critical Reynolds numbers at various axial locations are presented. A …

Installation Induced Stresses For Grouted Roof Bolts, R. N. Nitzsche, Charles J. Haas

Mechanical and Aerospace Engineering Faculty Research & Creative Works

The judicious use of roof bolts in stabilizing underground openings necessitates the ability to determine the state of stress in and around such bolts. A method of modeling a system of roof bolts is presented. This method is then applied in the determination of the state of stress due to bolt tightening. Two specific roof bolt configurations are considered: a fully grouted post-tensioned bolt and a post-tensioned bolt with grouted-end anchorage. The analysis showed that the grout annulus transferred nearly all of the bolt load 3nto the rock within a distance of 12 hole diameters from the point of bolt …

Extremal Structure Of Convex Sets, J. C. Hankins

Doctoral Dissertations

"Let X be a locally compact closed convex subset of a locally convex Haus Dorff topological linear space E. It is shown that every exposed point, respectively, ray of Xis a strongly exposed point, respectively, ray of X. Also, every extreme point, respectively, ray of Xis a denting point, respectively, ray of X. When the above results are combined one can restate two well-known Krein Milman type theorems due to Klee. There exists a closed convex set that has an extreme point that is neither a denting point nor an exposed point.

In Banach spaces, necessary and sufficient conditions are …

Optimal Process Overdesign With A Flowsheet Simulator, Frank Joseph Doering

Doctoral Dissertations

"Overdesign is applied to chemical processes to include additional equipment for improved process reliability or to account for deviations from average conditions. An efficient method to optimize the overdesign of a complex chemical process is developed for use on a flowsheet simulation program. The effectiveness of the method is demonstrated by simulating the sulfuric acid process with metallurgical feed gas on the flowsheet program PROPS. The process is optimized for reliable and variable performance by the adaptive random search algorithm"-- Abstract, p. xi

Electrical Degradation In High Purity Barium Titanate, Jeffrey Duncan Keck

Doctoral Dissertations

"The stability of BaTiO₃-type insulators to DC fields has long been recognized as one of the important factors in determining the quality of a capacitor which uses such a material as its dielectric. The slow increase of the electrical conductivity of an insulator which is stressed by DC fields at levels below the breakdown strength is normally termed degradation. Since degradation is a very common malady to the ceramic capacitor manufacturers, many studies have been conducted over the past two decades in efforts to learn how to remedy the problem.

The results of previous studies have shown that …

The Missouri Miner, December 11, 1975

The Missouri Miner Newspaper

No abstract provided.

The Missouri Miner, December 04, 1975

The Missouri Miner Newspaper

No abstract provided.

Missouri S&T Magazine, December 1975, Miner Alumni Association

Missouri S&T Magazine

No abstract provided.

Computer Manpower In The United States - Supply And Demand, John Wesley Hamblen

Computer Science Faculty Research & Creative Works

At a time when new departments of computer science, data processing, information science, information systems, etc. are being created and existing departments are trying to grow and compete with more established disciplines for scarce resources, it seems imperative that we attempt to keep abreast of the needs of industry and government for the graduates of these programs. This need must be monitored and matched against the production of graduates at all appropriate levels. The author has assembled extensive data on the latter over the past eight years while at the Southern Regional Education Board in Atlanta, GA (USA) during the …

Saturation Effects In A Tunable Coherent Near-Infrared Source, Israel L. Tyler, R. (Ralph) W. Alexander, R. (Robert) J. (John) Bell

Physics Faculty Research & Creative Works

A Saturation Effect in a Tunable Infrared Source Utilizing Four-Wave Parametric Conversion in Potassium Vapor is Reported and is Shown to Be the Result of Parasitic Oscillations. a Hundredfold Increase over Previously Attained Power Levels Has Been Affected Via Elimination of These Oscillations.

Radiative Lifetime Of The B ²Σˉ State Of Ch, Richard A. Anderson, Jerry Peacher, David M. Wilcox

Physics Faculty Research & Creative Works

The radiative lifetimes of the N'=3 to 15 rotational states of the v'=0 level of the B ²Σ^- state of CH were measured. Emission lines were observed to N'=15, but no lines above this rotational state were observed. This result agrees with previous studies. The lifetimes of all rotational states were between 300 and 400 ns. Previous measurements have indicated that the N'=15 level might have a lifetime as short as 100 ns.

Anion Grain-Boundary Diffusion In Soidum Chloride, K. S. Sabharwal, J. Mimkes, Manfred Wuttig

Materials Science and Engineering Faculty Research & Creative Works

The grain-boundary diffusion of 131I in Harshaw pure and Ca-doped NaCl was investigated in the temperature range between 430 and 560°C. The Arrhenius plot of the grain-boundary diffusivity parameter Dδ displays a marked dip at around 510°C. It is proposed that this dip is due to a phase transformation occurring at the grain boundary, possibly calcium segregation.

The New Lead Belt In The Forested Ozarks Of Missouri, Bobby G. Wixson, J. Charles Jennett

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

No abstract provided.

High-Frequency Dielectric Measurements On Electro-Optic Single Crystals, J. R. Teague, R. R. Rice, Robert Gerson

Physics Faculty Research & Creative Works

A slotted line was used to measure the high-frequency dielectric constant and loss tangent of several electro-optic crystals useful for wide-band laser modulator applications. Dielectric measurements were made at 0.1, 0.3, 1.0, and 2.0 GHz.

The P-Nitrobenzyl System. Iv. Base-Induced Transformations In P-Nitrobenzyl Chloride, Bromide, Iodide, Tosylate, And Sulfonium Salts, Samir B. Hanna, Paul H. Ruehle

Chemistry Faculty Research & Creative Works

No abstract provided.

Proximity Of Contraflexure To Plate Buckling Load, H. H. Spencer, A. C. Walker

CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)

No abstract provided.

Load Tests On Steel-Stud Walls, J. F. Mcdermott

CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)

No abstract provided.

Failure Of Thin-Walled Members Under Patch Loading, M. Elgaaly

CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)

No abstract provided.