Engineering Commons^™

An Introduction To Linear Time-Variant Digital Filtering Of Seismic Data, Richard Harold Lassley

Doctoral Dissertations

"The exploration geophysicist is constantly searching for new and better methods for analyzing seismic data. The primary purpose of this dissertation is to introduce linear time-variant digital filters as a technique for the filtering of seismic data. Methods of characterizing linear time-variant digital filters are discussed in general terms. The advantages of the different impulse and frequency responses are cited. In addition, the meanings and possible interpretations of the time and frequency variables introduced are considered. The concept of linear time-variant digital delay filters is presented along with their relationship to impulse responses. A pictorial diagram of discrete time-variant impulse …

Permeability And Additive Absorption And Extraction In Lubricating Greases, Eugene Hsiung-Jen Tu

Masters Theses

"A permeability apparatus was used to measure the permeability coefficients of eight Lithium-Calcium greases and ten Baragel greases in which the viscosity and type of the oil component were varied. The oil present in each grease was used for its permeability measurement.

An improved sample packing technique was developed to improve the repeatability of permeability measurements. Repeatability of ± 3% was achieved. In general the permeability coefficients of the non-soap Baragel greases were higher than those of the lithium-calcium greases with comparable oil components, and those of greases containing paraffinic oils were higher than these containing naphthenic oils. The effect …

The Prediction Of Mix Design Properties For Dense Graded Bituminous Mixtures, Robert Ernest Weeks

Masters Theses

"The purpose of this investigation was to ascertain the feasibility of interpolating values of the physical properties of a dense graded bituminous mix between known values. Also the effects of limestone mineral filler on the properties of a dense graded mix are evaluated. The variables in this study were mineral filler and asphalt cement. Control mixes were established at 2, 6 and 10 percent mineral filler and experimental mixes were prepared at 4 and 8 percent filler. The aggregate consisted of limestone and was mixed with an asphalt cement of 85-100 grade penetration. Al mixes were tested by the Marshall …

A Circularly Polarized Corner Reflector Antenna, Walter Ronald Koenig

Masters Theses

"Image theory is used to develop the far field and polarization equations for a ninety degree corner reflector antenna. These equations are in terms of spherical coordinates, the length of the dipole element, the distance of the dipole from the corner of the reflector, and the angle of tilt of the dipole element with the apex of the corner. The equations are simplified to give the far fields in the vertical and horizontal planes for the special case of a half-wavelength dipole. An expression to calculate the distance of the dipole from the corner necessary to give circular polarization broadside …

Radial Water Encroachment - An Approximation, Tommie C. Wilson

Masters Theses

"This presentation consists of the application of empirical equations for the calculation of the water influx into a radial oil reservoir in which the history of the rate and cumulative water influx are equated to the pressure decrements and time. This new analysis, based on William Hurst's solution for the steady-state water influx, yields an accurate method for determining water influx through the application of simple linear empirical equations. These linear approximations reproduce the rigorous influx solutions to a maximum deviation of 1.6 per cent"--Abstract, page ii.

Stability Determination By Liapunov's Method In Nonlinear Control Systems, Neng-Chung Liao

Masters Theses

"An introduction to Liapunov's second method as it applies to control system stability is presented in this work. Main theorems and definitions of Liapunov's method are treated. In particular, Lur'e's method and Szego's method for testing the stability of a nonlinear system are presented, and several examples are used to illustrate these procedures"--Abstract, page ii.

Use Of Spent Sulphite Liquor For Stabilization Of Fractured Rock And Sealing Off Water Bearing Formations, Laxman Singh Sunda

Masters Theses

"The paper industry, in its process of manufacturing pulp from wood, produces large quantities of a substance called lignin, lignin sulphite, or lignosulphonate. This material has been disposed of as a waste product; however, it does have many potential uses. In this investigation, lignosulfonates were used as agents for bonding rock sections together and, as the chief component of gels, for filling the pores of artificial rock cores. The purposes of these tests were to find how this substance could be used in the mining industry, for stabilizing fractured ground around mine openings and for sealing off water influx into …

Effect Of Calcium Lignosulfonate On Properties Of Concrete At Early Ages, Lawrence Kong-Pu Wang

Masters Theses

"The objective of this investigation was to determine the effects of calcium lignosulfonate on the physical properties of concrete. Calcium lignosulfonate used as an admixture was tested for its effect on the tensile and compressive strength of plain concrete cylinders, and for its effect on the flexural strength of plain concrete beams. The effect of the admixture on shrinkage, slump, air content and unit weight was also studied. the test results showed that calcium lignosulfonate reduces the amount of water required to make a workable concrete mix; a more workable mix saves money because it is easier to place, thus …

Solid Solubility Of Sulfur, Selenium, And Tellurium In Molybdenum At 1100°C, Lattice Constants Thermal Expansion Coefficients, And Densities Of Molybdenum And The Molybdenum-Base Alloys, Ramesh Purushottamdas Shodhan

Masters Theses

"With the ever increasing requirement for engineering materials having adequate mechanical properties at ever higher temperatures there has been, in quite recent years, a considerable increase in the study of molybdenum and molybdenum-rich alloys. Since 1945 extensive information on the engineering properties of molybdenum and molybdenum-base alloys has gradually become more available ... The present work involves the determination of solid solubility of elements with large atoms such as sulfur, selenium, and tellurium in molybdenum at 1100°C using the parametric method. Furthermore, the thermal expansion coefficients of pure molybdenum and of molybdenum-base solid solutions containing the elements just mentioned were …

Discharge Characteristics Of Side Weirs, Edgar Snowden

Masters Theses

"The purpose of this study is to investigate the division of flow of water in a flume of rectangular cross-section when the flume is provided with a side weir. An equation has been derived so that the quantity of water flowing over the side weir compared to the quantity of water flowing in the main channel can be predicted. This ratio is acceptable only within the ranges of heads, velocities, and weir lengths imposed by the geometry of the system tested"--Abstract, page ii.

The Effect Of Cadmium On Anaerobic Digestion, Lyle Lynn Pruitt

Masters Theses

"The main purpose of this study was to determine the effect of cadmium on anaerobic digestion. Metal concentrations in the form of regular and slug doses were considered. The possibility of acclimating anaerobic bacteria to higher cadmium levels was studied, and attempts were made to reestablish digestive action through re-seeding in digesters overcome by high cadmium concentrations"--Abstract, page [ii].

The Design Of A Sensitive Probe For Mass Flux Measurements Of Water Vapor In Air, Devendra Vaikunthlal Mehta

Masters Theses

"This investigation pertains to the construction and investigation of a sensitive probe to determine the possibility of measuring the mass flux of water vapor in air under non-flow steady state conditions. The probe was a small electrolysis cell is which the electrolyte (partially hydrated phosphorus pentoxide) was used as the sensing element. The rate of mass transfer was determined by measuring the amount of direct current flowing through the acid film"--Abstract, page i.

Linvill's Model As Applied To P-N Junction Photo-Diodes, Rudy Michael Chittenden

Masters Theses

"The problem undertaken in this study is to present a performance evaluation of Linvill's model as it pertains to the p-n junction photo-diode. The evaluation is performed by comparing the distributed mathematical solutions, the solution obtained using Linvill's lumped model, and the experimental measurement of the transient voltage rise across a photo-diode due to a unit-step pulse of light incident on the junction. Despite the absence of a suitable light source for use in the experimental measurement, it is concluded that Linvill's model provides an excellent means to determine the risetime of a photo-diode. This is provided that the photo-diode …

The Effect Of Varying Sea Coal Fineness On Sea Coal Activity In Molding Sands, Laurence A. Cooley

Masters Theses

"An experiment was conducted in an attempt to establish a relation between sea coal activity in a facing sand and the particle size of the sea coal added to the sand. It was felt that if a sufficient difference in distribution of volatiles was detected, a correlation between particle size and activity of the sea coal within the test specimens might be established. The lack of positive evidence to support such a relationship is indicative that a variation in particle size does not promote volatile re-deposition within the range of particle sizes investigated for the particular weight per cent of …

Anodic Dissolution And Disintegration Of Tin And Valency Of The Tin Ions Going Into Solution, Mrityunjoy Dutta

Masters Theses

"The increased demand for protective coatings on metals and for non-corrosive alloys has stimulated extensive research on the fundamental behavior of metals in corrosive media. One of the problems still unsolved is the nature of the mechanism of the anodic dissolution of metals like beryllium, zinc, magnesium, cadmium, tin, aluminum, iron in aqueous salt solutions. It has been reported in the literature that these metals show discrepancies which often arise between coulometric data and the weight loss of metal electrodes in various media. Several investigators have proposed different and opposing theories to explain the above deviation. The purpose of the …

A Study Of Sulfide Inclusions In Medium Carbon Steels, Shane Shiang Yen

Masters Theses

"Sulfur is a very important component in steel. Usually is it present as an impurity in commercial steels. In these materials the sulfur content is 0.05 percent maximum but may be higher or lower than this in some steels...It is generally believed that sulfur has a deleterious effect on the mechanical properties of steels. Originally this investigation was to deal with this aspect of sulfur in steels but the work did not progress to this stage. An effort was made to vary the nature of the sulfides in several experimental heats of steel by controlling their composition. Variation in the …

The Eccentric Orifice As A Flow Measuring Device In Small Diameter Pipes, James E. Casale

Masters Theses

"This thesis reports and evaluates the use of an eccentrically placed orifice as a flow measuring device in small pipe sizes. The orifice is placed in a concentric location and moved to increasingly eccentric locations until full eccentricity is reached. At full eccentricity the circumference of the orifice is tangent to the circumference of the pipe. The effects of increasing eccentricity are evaluated for four orifices...Flow coefficients for the orifices in different locations are plotted against Reynolds numbers. The eccentric orifice is a reliable, accurate flow measuring device for metering or controlling the flow of fluids. Design criteria can be …

Thermal Degradation Of Poly (Methyl Methacrylate) In Solution In Various Solvents, Ya-Chih Chen

Masters Theses

"A study has been made of the thermal degradation of poly (methyl methacrylate) of different molecular weights in toluene, ethyl acetate and chloroform. Four poly (methyl methacrylate) samples having molecular weights of 2,210,000, 733,000, 320,000, and 43,00, respectively were studied in this investigation. The results indicated that the polymer having a molecular weight of 2,210,000 undergoes degradation while the low molecular weight polymers having molecular weights of 733,000, 320,000, 43,000 undergo reverse polymerization"--Abstract, page [ii].

Finite Difference Solution For Triangular Plates, Hao-Yang Huang

Masters Theses

"In this thesis the finite difference method is used to solve triangular plates with uniformly distributed transverse load. As a matter of convenience triangular coordinates are used. The supporting conditions as well as the shape of plate are varied. All calculations are performed by digital computer. The patterns of differential operators in triangular coordinates, the deflections of plates, and the moment distributions are shown and discussed. The results obtained for some special cases are compared with published solutions"--Abstract, page i.

Model Study Of A Folded Plate Roof, Graham G. Sutherland

Masters Theses

"The purpose of this study was to conduct a model study of a folded plate roof in order to determine the feasability [sic] of using model studies as a method of design. Dimensional analysis was used to derive prediction equations for determining the stresses in two prototype structures, when the stresses in the model were known. One model and two prototype folded plate roofs were constructed of plexiglas [sic]. SR-4 strain gages were attached to the structures and strain readings taken as a uniform vertical load was applied in increments. From the strains the stresses at various points in the …

Test 930: John Deere 4020 Syncro-Range Diesel, Nebraska Tractor Test Lab

Nebraska Tractor Tests

No abstract provided.

Test 899: Massey-Ferguson Mf 135 (Gasoline), Nebraska Tractor Test Lab

Nebraska Tractor Tests

EXPLANATION OF TEST REPORT GENERAL CONDITIONS East tractor is a production model equipped for common usage. Power consuming accessories can be disconnected only when it is convenient for the operator to do so in practice. Additional weight can be added as ballast if the manufacturer regularly supplies it for sale. The static tire loads and the inflation pressures muse conform to recommendations in the Tire Standards published by the Society of Automotive Engineers. PREPARATION FOR PERFORMANCE RUNS The engine crank case is drained and refilled with a measured amount of new oil conforming to specifications in the operator’s manual. The …

Weed Control In Irrigation Channels, Geoffrey A. Pearce

Journal of the Department of Agriculture, Western Australia, Series 4

Probably the major task involved in maintaining drainage and irrigation channels is the regular removal of weed growth.

The cost of hand chipping a standard head channel is approximately 10s. per chain.

The use of suitable chemicals could reduce this cost considerably.

Good Facilities Help T.B. Testing, Department Of Agriculture, Western Australia

Journal of the Department of Agriculture, Western Australia, Series 4

Owner co-operation is needed for the smooth working of the tuberclin testing of cattle, compulsory in the South-West Land Division.

This article describes suitable facilities for the testing and how they operate.

Lot Feeding Of Beef Cattle. 3. Facilities Required For A Feed Lot, W J O Wilkie

Journal of the Department of Agriculture, Western Australia, Series 4

MANY THINGS must be considered in planning a feed lot.

The site must be well chosen, fencing, gates and yards must be adequate for the cattle carried and feeding and watering facilities should be of a high standard.

Other things to consider are the provision of shelter and shade for the cattle and buildings for feed storage and other purposes.

Impact Of Kokomo By-Pass From 1950-1964 : Technical Paper, Eugene G. Evans, Harold L. Michael

JTRP Technical Reports

No abstract provided.

Design Of A Photoelectric Transient Torque And Speed Meter, Raojibhai A. Patel

Masters Theses

"There are many situations in which it is desirable to know the speed of the shaft and the torque it is transmitting, when it is equally undesirable to make any mechanical connection to the shaft. This thesis describes the development and design of a device for measuring the torque and speed by photo-electric means. The basic principle is that a light beam parallel to the shaft may be used to pick up the desired information without adding friction to the system. The deflection of a torque tube inserted in the shaft opens or closes a set of apertures arranged in …

The Effect Of Lubri-Coolant Application At The Tool-Chip Interface On Tool Forces, Bomi Ardeshir Hathikhanavala

Masters Theses

"The purpose of this experiment was to determine the effectiveness of a lubri-coolant directed in such a way that it impinged just below the chip at the tool-chip interface in an orthogonal cutting process. This was compared to the conventional method of flooding lubri-coolant around the tool-chip area ... The results obtained show that the forces required to cut a material were less if the lubri-coolant was directed on the tool-chip interface when larger values of feed and depth of cut were used, and that with smaller values of feed and depth of cut, the method of flooding was equal …

Detection Of Stress Corrosion Cracking In U-Bend Brass Specimens By An Electro-Mechanical Method, Floyd Elwin Loftin

Masters Theses

"An apparatus was designed and built which held two u-bend specimens. When the specimens were exposed to a corrodent, losses in strength were detected as a result of stress corrosion cracking. The apparatus was used to study time to failure of cartridge brass u-bend specimens exposed to ammoniacal copper sulfate solutions which varied in pH. A minimum time to failure, 1.06 hours, was detected at pH 7.2. The maximum time to failure, for the range studied, was 28.36 hours at pH 7.7.

No useful data were obtained in the range from pH 6.6 - 6.8. thick, black surface coatings were …

Test 881: Ford 3000 8-Speed (Diesel), Nebraska Tractor Test Lab

Nebraska Tractor Tests

EXPLANATION OF TEST REPORT GENERAL CONDITIONS East tractor is a production model equipped for common usage. Power consuming accessories can be disconnected only when it is convenient for the operator to do so in practice. Additional weight can be added as ballast if the manufacturer regularly supplies it for sale. The static tire loads and the inflation pressures muse conform to recommendations in the Tire Standards published by the Society of Automotive Engineers. PREPARATION FOR PERFORMANCE RUNS The engine crank case is drained and refilled with a measured amount of new oil conforming to specifications in the operator’s manual. The …