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Udder Preparation For Milking, W G. Robinson

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

REGULAR routine methods of preparing the udder for milking hare long been recognised as essential for good "let down" of milk.

The biggest problem so far has been to combat the spread of disease, in particular mastitis from udder to udder by the milker's hands or the udder washing cloths.

Some Advances In Milking Shed Installations And Techniques, G W. Scott

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

TklG improvements in milk quality and increases in the level of production have occurred in recent years.

This has been largely due to improved dairy premises, technical advances in machine milking and better shed husbandry.

Swing Fence Flood Crossing For Creeks In The Kimberleys, A L. Payne

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

FENCING is the basis of the regeneration programme on the eroded Ord River catchment area, and the fences constructed must cross numerous creeks.

But heavy downpours of short duration characterise the wet season experienced in this area.

Because the rain falls on to bare, compacted ground, run-off is intense and gullies and creeks rise rapidly, causing serious damage to conventional fences and flood gates across watercourses.

Well Designed Cattle Yards, W J O Wilkie

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

GOOD yards are those in which cattle can be handled quietly, safely and efficiently.

The manner of handling is as important as the design of the yards.

Too much dog or whip can make cattle difficult, in even the best of yards.

A Practical Guide To Building Contour Banks With A Road Grader, J E. Watson

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

THOUSANDS of miles of contour banks have been built in Western Australia, and most of this earthmoving has been done by tractor and disc plough* or by road grader.

This article describes the technique recommended for bank construction with the road grader.

Siphon Tubes For Furrow Irrigation In The Kimberleys, K S. Cole

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

Irrigation soils in the Ord River area have a high clay content and erode easily under the influence of running water.

To overcome the problem of erosion in cuts between the head channels and irrigation furrows polythene siphon tubes have been found the most satisfactory.

In this article K. S. Cole, B.Sc. (Agric), Agricultural Adviser, Kununurra, describes the use of siphon tubes for furrow irrigation in the Kimberleys.

Farm Dams In The Wheatbelt, J E. Watson

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

MANY new farm dams are sunk each year in the wheatbelt and much money is spent on them.

With continued development of new land, and increasing stock carrying capacity of older land under legume pastures, the need for more water supplies will continue for a long time.

Back Flushing On Milking Machine Teat Cups, G W R Scott, K. Needham

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

THE possibility of replacing the dipping of teat cups between cows with a system of back flushing with water has been investigated for some time by different workers.

Firebreaks Without Erosion : Hints To Prevent Firebreak Erosion, Department Of Agriculture, Western Australia

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

AGRICULTURAL fire risks are now greater than they have been in the past and are steadily increasing with the advance of agriculture in Western Australia.

During the past 20 years the area of cleared arable land and the area under crop have more than doubled.

The area of established pasture is four times as great as it was. Pastures and crops are much more productive —and more liable to carry destructive fires than they were.

Thermocouple Shape Influence On Response In A Dynamic Compressible Fluid Atmosphere, Philip J. Steger

Masters Theses

"This investigation was performed to determine whether the geometrical shape of a thermocouple used to measure the temperature of a dynamic fluid atmosphere had any affect on its recovery factor and time response.

A converging nozzle was used to establish a dynamic fluid stream in which shaped silver solder junctions of copper-constantan thermocouples were tested. The velocity of the working fluid, air, was about 1000 ft/sec at the test point.

The investigation was successful, within experimental limits, in determining that the recovery factor of a bare thermocouple junction is not influenced by geometrical shape The results agreed substantially with available …

A Study Of A Method For Determining Properties Of Metals At High Strain Rates., Warren Heidbreder

Masters Theses

"An experimental method has been developed for determining the tensile and other physical properties of metals under high loading rates. Experimental equipment was designed, fabricated and tested. It was desirable to keep the equipment simple and inexpensive so that it could be used by operators Lacking experience in electronics and high-speed photography which are required for some of the more sophisticated methods now in use. The energy for pulling the specimens is supplied by smokeless gun powder. The firing of a cartridge into a closed cylinder with movable piston accomplishes the breaking of the specimen. A record of the time, …

The Performance Of A Mechanically-Aided Countercurrent Extraction Column., Jerry James Carr

Masters Theses

"In recent years liquid extraction has become a major industrial method for the separation of liquid solutions. Liquid extraction has proven successful in some separations performed only with great difficulty by other, more common mass-transfer operations. Th e industrial utilization of liquid extraction has resulted in considerable interest in the design and performance correlations of high-capacity, high-efficiency extraction equipment.

Continuous countercurrent columns, filled with various packings, baffles, and plates, have been found to be relatively ineffective in liquid extract on service. The density difference of the contacted phases is generally insufficient to, by itself, cause the intimate contact necessary for …

Hydraulic Transportation Of Coal In Open Flumes., Nallapu Narayan Reddy

Masters Theses

"The objective of this study is to design a simplified form of hydraulic transportation system using open-flumes and operated by gravity in pitching coal seams. This type of system is to be used in conjunction with mining by hydraulic methods where the water used for the extraction of coal can also be used for the loading and transport functions"--Introduction p. 1

Determining Stability Of Nonlinear Control Systems Via Lyapunov's Method., John Joseph Komo

Masters Theses

"The problem undertaken in this thesis is to present Lyapunov's method of stability as i t applies to control systems and to use it in the stability analysis of nonlinear control systems. The variable gradient method of generating Lyapunov functions is presented since this seems the best general procedure for obtaining Lyapunov functions. Also, the integration of matrices method is presented as a comparison. ii

Procedures for the use of the variable gradient method and the integration of matrices method are written and several examples are used to illustrate these procedures.

It is concluded that Lyapunov's method is very definitely …

Swelling Properties Of Putnam Soil, Oscar M. Palma

Masters Theses

"Volume change of Putnam soil under different moisture contents and the swelling pressure developed by the soil at the same moisture contents were investigated using standard test procedures.

The theory of one dimensional consolidation of Terzaghi was reviewed as well as the literature on swelling and swell pressure.

It was found that swell depends mainly on the initial water content, while swelling pressure depends mainly on the dry density of the soil"--Abstract, page ii.

Liquid Mercury Embrittlement Of Thin-Walled 2024 Aluminum Tubes, Edward J. Beckemeyer

Masters Theses

"The dislocation theory, Zener-Stroh crack model, and the Petch relationship, which correlates fracture stress and grain size, were used to analyze the embrittlement of 2024 aluminum alloy tubes by liquid mercury.

Surface energy ratios, [formula], were determined for biaxial stress ratios of 1/2, 1, ∞. The values of the surface energy ratios considered were 4.24, 1.79, 1.46, respectively. As part of this study, an approximate Nabarro-Peierls frictional stress was calculated for each stress ratio"--Abstract, page 2.

Infrared Modulation Using The Field-Effect Properties Of Germanium., Lloyd E. Brunkhorst

Masters Theses

"The absorption of infrared radiation, by free carriers in germanium, has been used to amplitude modulate infrared radiation. In the experiment, a space charge layer consisting of free carriers is established at the inner surface of a germanium sample by using the field-effect technique. Infrared radiation of a wavelength to which the germanium is transparent is then Internally reflected from this surface. The infrared radiation passes twice through the space charge layer for each internal reflection. With each pass through the space charge layer, the amplitude of the transmitted infrared is decreased. Amplitude modulation of the transmitted infrared is accomplished …

Derivation Of A Method To Determine Reactions And Deflection Of A Continous Beam On An Elastic Foundation, Louis Richard Fuka

Masters Theses

“The purpose of this thesis is to develop a method for determining the reactions and deflection curve of continuous beams partially supported by an elastic foundation. The method involves representation of an arbitrary loading and the intermediate redundant reactions as Fourier Series. Redundant intermediate reactions are determined by the solution of an equal number of linear equations. The remaining reactions are determined by the application of statics.

This same method can be used for simply supported beams on an elastic foundation and for continuous beams without an elastic foundation”--Abstract, page ii.

A New Method Of Making Stainless Steel Powder By Electrochemical Disintegration, Mohammed Maher Saad

Masters Theses

"This paper describes a new method of making austenitic stainless steel (18/8) powder by electrochemical disintegration. The method used an external direct current applied to a heat-treated stainless steel anode, and a platinum cathode in an electrolyte of an aqueous solution of 20% HNO₃ and 1% H₂SO₄ by weight respectively.

Special attention has been paid to the size distribution of sieve and sub-sieve sizes, and the following ranges were found: approximately one-half lies between the limits of 200 and 325 mesh, and one third is finer than 325 mesh, with the remainder about +200 mesh, average …

A Rc Active Delay Time Network., Robert Sun-Wu Han

Masters Theses

"This thesis presents a method for performing an approximate synthesis of a variable delay time network by using RC elements and active analog computer circuits. The delay networks discussed here can provide delay times which range from zero to 96 milliseconds for inputs with frequencies which range between zero 2nd 5 cycles per second.

Basically, the procedure involves approximating the delay time transfer function, e^-jwTd , by the ratio of two polynomials each of which is represented by a finite series of terms. The ratio is then shown to be easily synthesized by RC elements and analog computer circuits. …

A Study Of The Angular Velocity In A Liquid Induced By A Vortex In An Emptying Container, James Paul Hartman

Masters Theses

"Previously a limited amount of investigation has been done to describe the rotational motion of fluid in a draining tank. To date tank design has been based on trial and error, since the physical mechanisms of actual draining have not been recognized. This investigation has been made to develop a technique for the measurement of the motion of the fluid during the draining process and to present the results of the observed surface velocity of the liquid as a function of depth of fluid and its distance from the center of the vortex core. Many previous investigators of vortex behavior …

Non-Ferrous Metal Mining And Smelting In Australia, H. R. Hanley

Missouri School of Mines and Metallurgy Bulletins

No abstract provided.

A Graphical Solution Method For The Tchebychev Elliptic Function Filter, Gene S. Luckfield

Masters Theses

"This thesis is concerned with the design of the Tchebychev elliptic function filter. The Darlington synthesis procedure is discussed and salient points from Darlington's paper needed for the design of this filter are presented.

It is shown that the design of the Tchebychev elliptic function filter requires a knowledge of the elliptic functions, particularly the elliptic sine. Since the use of these functions is not common, a brief review of their properties is presented.

Using the elliptic functions, a development of the equations describing the behavior of the Tchebychev elliptic function filter is given for the case of a normalized …

Determination Of The Standard Free Energy Of Formation Of Zr₃S₂, Peter E. Otten

Masters Theses

"The Knudsen effusion method was used to find the equilibrium magnesium pressure for the reaction

3 Zr (s) + 2 MgS (s) = 'Zr₃S₂' (s) + 2 Mg (v)

By using known standard free energy data for the formation of magnesium sulfide and by using the equilibrium magnesium pressure, the standard free energy of formation of Zr₃S₂ was calculated and could be expressed by the equation

Δ F° = -139,800 + 49.13 T cal/mole

in the temperature range 900 to 1100°C.

It was also found that Zr₃S₂ was the zirconium …

Stress And Deflection In An Elastic Mass Under Semiellipsoidal Loads : Informational Report, John Leonard Sanborn

JTRP Technical Reports

No abstract provided.

An Investigation Of Optimum Journal Bearings., Kulin Purshotam Maskai

Masters Theses

"Not much has been done towards calculating the "Optimum Bearing" from the point of view of maximum load capacity or minimum friction. It has been found that there 1 is not much difference in the "Optimum Bearing" proportions, as calculated, considering either minimum friction or maximum load capacity

Journal bearings are commonly used and they play a very important role in reducing friction and wear. Engineers use past experience in choosing a bearing for the given conditions. A bearing design can be obtained if 'Optium Bearing' proportions are calculated as suggested by Kingsbury (1) in his article on 'Optium Conditions …

Zinc Sulfide-Sulfate Reaction Pressures, William L. Hallerberg

Masters Theses

"A static manometric method was used to find the equilibrium reaction pressure as a function of temperature for the reaction:

11 ZnSO₄ + ZnS → 4 (ZnO·2ZnSO₄) + 4 SO₂

From the reaction pressures, the standard free energy of the reaction was found to be:

ΔF⁰ = + 51,320 - 36.68 T

Using thermodynamic data for ZnSO₄, ZnS and SO₂ the standard free energy of formation of the basic salt ZnO·2ZnSO₄ was found to be:

ΔF⁰ = - 377,000 - 65.9 T cal/mole

in the temperature range 350 to 420⁰ C.

Above …

A Study Of Rotational Critical Speeds For A Multi-Mass, Multi-Span System, Pravinchandra M. Upadhyay

Masters Theses

"It is well known that the unbalanced inertia forces present in rotating shafts set up violent vibrations in a transverse direction at certain speeds known as critical speeds, whirling speeds or whipping speeds. Therefore one who deals with the design of rotating machine parts, such as turbine rotors, multi-cylinder engine crankshafts etc., must consider transverse vibrations of rotating parts.

Practical solutions for finding the critical speeds of simple rotating systems, such as a single disk on a shaft with a single span, were derived by many authors. But as the number of loads and spans increases the problem becomes complex …

Investigation Of Ablation Materials, John Martyn Schattyn

Masters Theses

"The desired result of this paper is to determine what effect the physical and thermal properties of a material have on the ability of that material to act as an ablation heat shield. On the basis of their physical properties, five materials, nickel, beryllium, fused quartz, teflon, and phenolic-nylon, were chosen as examples.

The tools used for this study are heat transfer equations involving a change in material phase. The resulting criteria may be assumed applicable to any material exhibiting one of the four types of ablation processes"--Abstract, page 2.

Analysis Of A Char-Forming Ablator, William J. Reilly

Masters Theses

"The purpose of this thesis is to conduct an analytical analysis of a char-forming ablation material. This is one phase of ablation heat transfer.

Fourier's general equation for one dimensional heat conduction is transformed to moving coordinates and is then solved using the applicable boundary conditions. Solutions of this equation are valid for initial studies in ablation heat transfer"--Abstract, page ii.