Physical Sciences and Mathematics Commons^™

A Clinical Comparison Of Six Orthodontic Techniques, Erik H. Madsen

Loma Linda University Electronic Theses, Dissertations & Projects

Controversy exists concerning the relative superiority of various orthodontic techniques because of the difficulties encountered in making comparative clinical studies of these techniques which are scientific and statistically meaningful. The purpose of this study was to clinically compare six different orthodontic techniques which are currently being taught, relative to a number of criteria, and to do it in a scientifically significant manner.

In order to eliminate as many of the irrelevant variables as possible, the patients were required to pass a relatively stringent screening to participate. Among other things, the patients had to have first molars in Class I relation …

Assisting Mothers To Successfully Breast Feed Their Babies, Annabelle Moore

Loma Linda University Electronic Theses, Dissertations & Projects

This experimental study tested the effect of a teaching program on success of a group of mothers desiring to breast feed their babies. It was hypothesized that mothers receiving specific instructions on the physiology of lactation and the proper sucking technique would have greater success than mothers not so instructed.

To be categorized as successful the mothers had to have an adequate supply of milk and had to express satisfaction with breast feeding. Criteria for adequacy of milk supply consisted of weight gain of the infant within accepted norms without use of supplementary formula.

Twenty breast feeding mothers who delivered …

Selected Factors Related To Ability To Regain Bladder Function Following Indwelling Catheterization, Jongkolnee Padmasiri

Loma Linda University Electronic Theses, Dissertations & Projects

This exploratory retrospective study was designed to evaluate selected factors, including the ability to regain bladder function related to post indwelling urethral catheterization in an acute general hospital population.

The records of 107 patients who met the study criteria became the study population. These patients had three-way urethral catheters, continuous antibacterial irrigation and closed drainage system. Twenty patients died (19 percent) before the catheter was removed. Of the 87 patients who were alive, 37 percent (32 patients) had in-adequate bladder function. Of these 32 patients, no attempt was made to remove the catheter from 15 prior to their hospital discharge. …

Rhenium Catalyzed Hydrogenation Of Maleic Anhydride And Crotonaldehyde, William Russel Dixon

Theses and Dissertations

The preparation of a number of supported rhenium catalysts is reported. The determination of their activity and selectivity and of optimal reaction parameters for the reduction of maleic anhydride and crotonaldehyde is reported. Optimal time of hydrogenation was chosen as one hour and pressures were chosen as 2000 psig for crotonaldehyde and 3000 psig for maleic anhydride. Quantitative reduction of maleic anhydride to tetrahydrofuran occurred at 275° with charcoal supported rhenium catalysts. Lower temperatures (ca. 200°) produce quantitative amounts of butyrolactone. Unsupported catalysts at low temperatures (100°) selectively reduce crotonaldehyde to crotyl alcohol, but at very low conversion rates. Temperatures …

Toward Hydrogen Bonds Of Predictable Geometry, Robert Shao-Chih Hsu

Theses and Dissertations

A literature review on the geometry of hydrogen bonding showed that the geometry is often de-emphasized or even ignored, probably because of the inherent flexibility of many systems studied. Examination of molecular models suggested the geometrically constrained bicyclo [2, 2, 1] heptane system wherein hydrogen bond distances and angles might be more easily predicted. Dihydroboration-oxidation of norbornadiene was shown to yield exo, exo-2,5-norbornadiol, thus clarifying uncertainties in the literature. 2, 5-Norbornadiol was oxidized to the corresponding dione, heretofore inadequately characterized. Several derivatives of the dione were prepared, and spectral data were accumulated for the dione, its precursor, and its derivatives. …

Acid-Base Titrations In Sulfolane., Francine O. Lawrence

Chemistry and Chemical Biology ETDs

A study of the solvent effects of sulfolane (tetrahydrothiophene 1,1-dioxide, tetramethylene sulfone) upon a series of acids and several bases has been conducted. A procedure is presented for purifying sulfolane which results in a solvent of very low water content (5 x 10^-4 M ) and very few impurities, as shown by its cooling curve. Potentiometric and conductometric measurements of additions of acids and bases to purified sulfolane and of various acid-base titrations were made. The series of carboxylic acids included benzoic, orthomethoxybenzoic, and three different monochlorobenzoic acids. The bases investigated included sodium methoxide, pyridine, and diphenylguanidine. Interpretation of the …

84th Session Of The Iowa Academy Of Science, April 28-29, 1972, Iowa Academy Of Science

Iowa Academy of Science Documents

No abstract provided.

Abstracts Of Papers Presented At The 84th Session Of The Iowa Academy Of Science, April 28-29, 1972, Iowa Academy Of Science

Iowa Academy of Science Documents

Presentation abstracts from the annual meeting of the Iowa Academy of Science

19f Nmr And Bx3 Complexes, Nancy Toole Tucker

Morehead State Theses and Dissertations

A thesis presented to the faculty of the School of Sciences and Mathematics at Morehead State University in partial fulfillment of the requirements for the Degree of Master of Science in Chemistry by Nancy Toole Tucker on April 21, 1972.

Preparation And Reactions Of 2-Benzo [B] Thienylsodium, Larry Kennard

Morehead State Theses and Dissertations

A thesis presented to the faculty of the School of Science and Mathematics at Morehead State University in partial fulfillment of the requirements for the Degree of Master of Science in Chemistry by Larry Kennard on April 21, 1972.

Influence Of An External Electric Field On The Charge Transfer State Of The Tcne-Trans-Stilbene Molecular Complex, Craig J. Eckhardt

Craig J. Eckhardt Publications

An experimental investigation of the effect of an external electric field on the absorption spectrum of the tetracyanoethylene-trans-stilbene molecular complex in cyclohexane solution yielded values of 1.1±0.1 D for the ground state electric dipole moment and 10.5±0.9 D for the change of the electric dipole moment upon transition to the charge transfer excited state. The ground state electric dipole moment determined by the electro-optic effect is in agreement with the value of 1.4±0.5 D obtained from the dielectric constant measurements made on solutions of the complex. The directions of the transition moment, the ground state electric dipole moment, and the …

Schottky Defects In Alkali Halides, Paul D. Schulze, John R. Hardy

John R. Hardy Papers

The method of lattice statics and the deformation-dipole model have been applied to Schottky defects in ionic crystals in approximations higher than zero order. For an isolated vacancy, all host-lattice-ion potential energy functions for short-ranged repulsive and Coulomb-defect forces were expanded to terms quadratic in the displacements and dipole moments, and the resulting forces were allowed to act on the first and/or second neighbors to the vacancy. The zero-order Coulomb force was allowed to act on the remainder of the host-lattice ions past first and/or second neighbors. The vacancy and Schottky-pair-formation energies in the 12 Na, K, Rb halides have …

Government Oil Policy And Its Effect On Domestic & Offshore Oil Production, James Owers

Marine Affairs Theses and Major Papers

To date the petroleum industry is second only to the Department of Defense in its stimulation of ocean technology. By the end of 1968, American petroleum companies had invested over 13 billion dollars on the continental shelves of the United States. The development of submersibles, man in the sea, instruments, seismic surveys, mapping and charting, and development of ocean structures and engineering have all been profoundly effected by this massive injection of capital. It is obviously of interest, therefore, to consider policies which affect offshore oil exploration and development. This paper is confined to analyzing three such economic policies in …

Underwater Search And Rescue For Non-Military Submersibles, Peter A. Joseph

Marine Affairs Theses and Major Papers

A system of underwater search and rescue for non-military submersibles utilizing a helicopter delivered rescue submersible is proposed. In the last 10 years there has been a substantial increase in manned underwater endeavors. This expansion is expected to continue with increasingly greater emphasis in the recreational field. The necessity to overcome the relatively short iife support of the small recreation submersible dictates a rapid response. This system should be capable of providing the lift necessary to rescue the entrapped personnel by bringing the submersible to the surface. At the present time the Coast Guard must rely on other submersible operators …

Water Resources News, Volume 4, No. 4, April 1972

Water Current Newsletter

New Publications Available from NWRRI
Summer Short Course Planned
NRD's to Become a Reality
Interior Secretary Declares New Legislation Needs
USGS to Step Up Water Resource Investigations
Leagues of Cities Asks for Uniform Pollution Policy
House Passes WPC Bill
Erosion Booklet Released by EPA
Rainfall on Lake Ontario to be Gauged by Radar
Seminar on Coastal Zone
Senate Passes National Environmental Laboratory Law System
American Water Resources Conferences, Call for Papers
Water Pollution Laws Could Shut Marginal Plants
Committee Asks Cutback in Use of Phosphorous
Department Recommends Two Nebraska Projects
Hearing on WRC Principles and Standards
Underground Waste Storage Not …

Interferometric Studies Of Interstellar Calcium Lines, Laurence A. Marschall, L. M. Hobbs

Physics and Astronomy Faculty Publications

Interferometric, photoelectric scans of the interstellar calcium K-lines in the spectra of 65 stars are presented. The scans were obtained with a PEPSIOS spectrometer having a passband with a full half-intensity width of 1.0 kms(-1) or 0.013A. The fivefold improvement in resolution over that used by Adams reveals numerous line components which correspond very well to those of the interstellar sodium lines, apart from frequent differences in relative intensities.

Generalized Finite-Geometry Codes, Carlos R.P. Hartmann, Luther D. Rudolph

Electrical Engineering and Computer Science - Technical Reports

A technique is presented for constructing cyclic codes that retain many of the combinatorial properties of finite-geometry codes, but are often superior to geometry codes. It is shown that L-step orthogonalization is applicable to certain subclasses of these codes.

A Study Of The Kinetics Of Light Induced Modulation Of Absorption In Zinc Selenide, Herbert Seth Berman

Master's Theses

No abstract provided.

A Spectrophotometric Study Of The Reaction Between Benzoyl Peroxide And N, N-Dimethyl-P-Phenylenediamine, Bertha Cosby King

Master's Theses

A special need for methods to determine low concentrations of organic peroxides originated because of their hazardous and harmful effects, Even the small amounts of organic peroxide formed by autoxidation in ethers exposed to air make the ethers highly explosive and unsuitable for use as anesthesia or laboratory solvents. The formation of organic peroxides in fats and oils causes rancidity. They have been named as pollutants, and some of them are known to have detrimental physiological effects.

The purpose of this research was to improve this method of analysis and to determine better conditions for the measurement of color by …

Digital Computer Modeling Of Limestone Groundwater Systems, John Thrailkill, David P. Beiter

KWRRI Research Reports

Because limestone groundwater flows mainly In discrete openings, limestone aquifers are fundamentally different from aquifers In granular rocks. A digital computer program which simulates flow in a limestone aquifer as a pipe network was written and compared with the Sinkhole Plain aquifer of west-central Kentucky.

A reasonably good fit between observed parameters of the aquifer and those calculated were obtained under assumed conditions of both laminar and turbulent now In the aquifer. The Indicated gross permeablllty of the aquifer is 5600 melnzers with an assumed aquifer thickness of 100 feet. The location and discharge of springs along the streams bounding …

Abstract Papers

Journal of the Minnesota Academy of Science

No abstract provided.

Nuclear Quadrupole Coupling Of B-12 In A Single Be Crystal, R. L. Williams Jr., Richard C. Haskell, Leon Madansky

All HMC Faculty Publications and Research

Quadrupole resonance lines of β-unstable 12B have been distinctly resolved in a single crystal of Be, and have behaved properly under field reversal and variation of the angle θ between crystal c axis and external magnetic field.

Electronic Properties Of Fe2+ In Cubic Kmgf3 From Mössbauer Spectroscopy, Richard B. Frankel, J. Chappert, J. R. Regnard, A. Misetich, C. R. Abeledo

Physics

Iron-doped KMgF₃ single crystals have been studied by Mössbauer spectroscopy of Fe⁵⁷. Single lines due to Fe²⁺ and Fe³⁺ are observed at room temperature. For TK, the Fe²⁺ line splits into a quadrupole doublet with a splitting ΔE_Q=0.44±0.02 mm/sec. Comparison with a random-strain model due to Ham yields a value of 120 cm^-1 for the position of the first excited spin-orbit split level. Magnetic hyperfine structure in external magnetic fields at low temperature is observed and analysis yields a value of -495 ±30 kOe for the corepolarization hyperfine field …

Methodological And Validation Study Of Seed Reserves In Desert Soils, David W. Goodall, Stuart Childs, Herman Wiebe

Memorandum

The development of a method for separating seeds from desert soils, and enumerating them, is described.

In the Great Basin desert, species differed greatly in their depth distribution, some having a peak at or just below the surface, while others were still abundant below 5 cm. Much higher seed densities were found beneath the canopies of shrubs and of tussock grasses than in the inter-spaces; no consistent differences were found, however, associated with the species of the canopy plant, or with distance from its center.

Tentative estimates are given of the seed population in the four validation sites in Curlew …

The Major Contribution Of Leibniz To Infinitesimal Calculus, Carolyn Rhodes

Honors Theses

A study of the work of Leibniz is of importance for at least two reasons. In the first place, Leibniz was not alone among great men in presenting in his early works almost all the important mathematical ideas contained in his mature work, In the second place, the main ideas of his philosophy are to be attributed to his mathematical work, not vice versa. He was perhaps, the earliest to realize fully and correctly the important influence of a calculus on discovery. The almost mechanical operations which one goes through when one is using a calculus enables one to discover …

The Regular Polyhedra: A Study In Visual Aids For Teaching Geometry, Sammye Halbert

Honors Theses

Traditionally, mathematics, past simple addition, subtraction, multiplication, and division, has been taught of as being so boring, irrelevant, and in short, one of the unavoidable evils of school. An advertisement in The Mathematics Teacher expressed the general attitude of many students when it said, "mathematics was invented by an old magician in the desert who, with the help of his talking monkey, bakes equations and cupcakes in the hot sun." It seems that many students think mathematics is just one problem after another that has some mystical answer floating around in the air somewhere. The object is to get that …

The Relationship Between Degree Of Clay Dispersion And The Optical And Pore Properties Of Starch - Clay Coatings, Chinu S. Dalal

Masters Theses

No abstract provided.

Development Of An Ultra High Shear Recording Viscometer, David C. Thornton

Masters Theses

No abstract provided.

Scattering Spin 1/2 Particles By Nuclei, Pui-Wah Cheng

Masters Theses

No abstract provided.

Kinetics Of Free Radical-Initiated Polymerization Of Α-Methylstyrene In The Region Of The Ceiling Temperature, Fred E. Huang

Masters Theses

No abstract provided.