Chemistry Commons^™

The Use Of Thermal Analysis In The Identification And Characterization Of Fibers Of Forensic Interest, Ronald J. Coffey

All-Inclusive List of Electronic Theses and Dissertations

This study investigates the use of thermal analysis for the identification and characterization of fibers for forensic purposes. Fibers such as polyesters, polyacrylics, polypropylenes and nylon were investigated by Differential Thermal Analysis (D.T.A.) and Thermogravimetric Analysis (T.G.A.) to see if their resulting thermograms were characteristic of each fiber. Also, infrared analysis was performed on each fiber. In addition, such factors as heating rate and sample size along with fiber blends were studied as to their effect on thermograms. As a result of this study several important conclusions may be drawn. Although it was found that for the most part D.T.A. …

Luminescence In Slipped And Dislocation-Free Laser-Annealed Silicon, R.H. Uebbing, P. Wagner, H. Baumgart, H. J. Queisser

Electrical & Computer Engineering Faculty Publications

Photoluminescence of cw laser-annealed silicon shows a dramatic difference in electronic behavior of the reconstructed material depending upon either creation or suppression of dislocations. Beyond a critical exposure time slip appears, and the luminescence of these samples is dominated by dislocation-related defect levels.

Nitrogenous Fertilisers For Cereal Production, M G. Mason

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

Among the many factors influencing crop response to nitrogen applications, the most important are the season, soil type, paddock history, time of application and source of nitrogen. Before deciding whether to use nitrogen on a cereal crop, which source to use and at what rate, the farmer needs some understanding of how these factors work.

Process Control Of Activated Sludge Treatment, Phase Ii, Richard I. Kermode, Robert W. J. Brett, Joseph D. Pault Jr.

KWRRI Research Reports

Material balances on substrate and microorganisms were derived in conjunction with various mixing configurations thought to accurately describe the activated sludge process. These models include the completely mixed with bypass, plug flow, and plug flow with bypass. Two sets of kinetic mechanisms for substrate utilization and bacterial growth were employed.

A feed forward controller was designed from linear approximations of the material balances derived in the completely mixed with bypass mixing model. Utilizing frequency response methods, the controller was found essentially identical to a completely mixed modeled controller developed in a prior investigation.

Through computer simulation the controller's effectiveness was …

On The Mechanism Of The Diels-Alder Reaction--Dimerization Of Trans-Phenylbutadiene, Michael Ward Mcnicholas

Dissertations and Theses

The Diels-Alder dimerization of trans-1-substituted butadienes is expected to yield a cyclohexene adduct with the substituents in the 3 and 4 positions cis to one another. This prediction is based on past observations of other Diels-Alder additions. The cis-isomer is the only one consistent with a two-stage mechanism proposed by Woodward and Katz.

In the case of trans-phenylbutadiene, the expected adduct is cis-3-phenyl 1-4-(trans-styry1) cyclohexene. Alder, Haydn and Vogt, however, reported that the corresponding trans-isomer is the dimerization product. There is reason to believe that the observation of the trans-isomer may have been the result of product isomerization during purification. …

Evidence For The Existence Of Two Stable Sites For Cobalt Impurity Atoms In Aluminum, Arun Venkatachar

Dissertations and Theses

Using Fe⁵⁷Mössbauer spectroscopy, two alternative sites occupied by cobalt (10^-4 at. % ) impurity atoms in aluminum have been isolated. The substitutional site A is the stable position after annealing the sample above 840 K, followed by a rapid quench. The impurity atoms in site A are characterized by a single line Mössbauer spectrum (indicative of a cubic environment), a room-temperature f = 0.502 (r. m. s. displ. 0.071 A) and an I. S. (reI. to Fe) = -0.421 mm/sec. For anneals below 770 K the cobalt atoms migrate to site B, which is characterized by a …

Investigation Of The Alpha-Sub-Gamma Phase In Alnico 6, Cortez Samuel

Dissertations and Theses

The purpose of this research project was to study the αᵧ phase in Alnico 6. Other phases were studies for comparison. Also the effect of an applied magnetic field on the formation of the αᵧ phase was investigated.

Three single crystals of Alnico 6 were heat treated for one hour--one at 1250°C, one at 1000°C, and one at 800°C--and water-quenched. The microstructure of each sample was observed with the optical microscope, and X-ray diffraction patterns were taken to determine the crystal structure of the phases present.

Several single crystal samples of Alnico 6 were heat treated at 1000°C and furnace-cooled. …

Sheep : Experimental Basis For Urea Feeding Recommendations, Department Of Agriculture, Western Australia

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

Recent scientific reviews have concluded that in spite of the great number of experimental observations recorded throughout the world there is no evidence yet to prove that urea can be used profitably for sheep on low quality roughages in genuine grazing conditions.

An experiment is in progress at Merredin Research Station this season, especially designed to demonstrate a response to urea by sheep grazing wheat stubbles, if such a response is possible.

The Control Of Weeds In Cereals, Geoffrey A. Pearce

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

PRACTICALLY all broadleaved weeds found in cereals can now be killed with herbicides and with most, the farmer has a choice of chemicals.

Two more new products are now available and these have several advantages over other herbicides.

Chemical Ploughing, Geoffrey A. Pearce

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

PROGRESS in the field of chemical weed control has been spectacular in recent years. One field that is attracting interest is the idea of replacing cultivation with chemical sprays.

Copper, Zinc And Molybdenum Fertilizers For New Land Crops And Pastures : 1969, J W. Gartrell, R. N. Glencross

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

Four years of intensive research into soil deficiencies in developing areas have resulted in a more comprehensive understanding of the need for trace elements in Western Australia.

Active Magnesium Oxide Prepared From Magnesium Oxalate Dihydrate, Jehane Nour El Dine Ragai

Archived Theses and Dissertations

No abstract provided.

Properties And Structure Of Some Chalcogenide Glasses, Amin Ismail Amin Abdel-Latif

Archived Theses and Dissertations

No abstract provided.

A Study Of Some Properties Of As2S3 Glass And The Test Of A New Theory Of Glass Formation, Edward Nashed Bolous

Archived Theses and Dissertations

No abstract provided.

Some Properties Of Cerium Borate And Phosphate Glasses In Relation To Structure, M Osama El-Bayoumi

Archived Theses and Dissertations

No abstract provided.

The Electrical Resistivity Of Different Types Of Glasses, Fadel Youssef Iskandar Assabghy

Archived Theses and Dissertations

No abstract provided.

Benzohydroxamic Acid As A Reagent For The Determination Of Aluminum And Copper, William E. West

Masters Theses

No abstract provided.

Soft Water For Dairy Cleaning, Department Of Agriculture, Western Australia

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

CLEAN utensils are essential for the production of high quality dairy products.

Cleanliness of dairy equipment depends a lot on how efficiently the detergent can do its job.

Investigation Of The Platinum-Rich Portion Of The Platinum-Tantalum Phase Diagram, Bob Dean Browning

Theses and Dissertations

The Pt-Ta binary system was investigated at two isotherms;1000°C and 1500°C, and at eleven alloy compositions in the range of 50 to 100 atomic percent platinum. The alloys were examined by x-ray diffraction and metallography. Three intermetallic compounds, Pt₂Ta, Pt₃Ta, and Pt₄Ta were found to exist in this composition range. The Pt₄Ta intermetallic appeared only at the 1500°C isotherm. Platinum dissolved tantalum substitutionally to 90 atomic percent at 1500 °C and to approximately 80 atomic percent at 1000 °C.

The Control Of Grasses With Chemicals, G R W Meadly

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

GRASSES are among man's greatest assets and usually he tries to encourage their growth.

The cereals, rice and many other grasses supply him with basic items of food and they are also important components of pastures which provide grazing for sheep and cattle.

Copper Minerals For Fertilizer Use, R N. Glencross

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

COPPER fertilizers have an important role in maintaining: and increasing Western Australia's agricultural production.

On many soils they are essential for cereal growing or pasture production and persistence and for animal health and wool quality.

They are also sometimes used for fruit trees, vines, and vegetables.

Feeding Pickled Wheat To Pigs, Department Of Agriculture, Western Australia

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

INQUIRIES are frequently received from farmers asking whether it is safe to feed pickled wheat to pigs, and if so, the quantities which would be suggested.

Until very recently there was no experimental information on the safety or possible dangers of these wheat pickling agents, but feeding trials completed last year at the Animal Health and Nutrition Laboratory, Nedlands, have provided some of the answers to these questions.

List Of Registered Fertilisers : 1959-60, H G. Cariss

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

TN accordance with the provisions of the Fertilisers Act, 1928-1955, it is required that—with the exception of bulk sales to a manufacturer and those made in accordance with a buyer's written prescription—all fertilisers sold are required to be registered annually, the registration year being from November 1 to October 31 following.

The list of fertilisers registered for the year commencing November 1, 1959, is set out herewith in tabular form.

Various Ways Of Preventing The Formation Of Scale In Sea Water Evaporators, James M. Stanek

Bachelors’ Theses

Previous work carried out at Marquette University has proved that the formation of scale in sea water evaporators can be prevented if such things as dehydrated alfalfa foliage or dehydrated corn, oats, peas, and grass foliage are added to the feed sea water. It has also been proved that the maturity of the plant from which the corn foliage has been stripped varies the scale preventing ability of the foliage, and that the storing of the corn foliage increases its scale preventing ability. The object of this work is to determine what effect the combination of various types of stainless …

The Analysis Of Brass And Bronze For Aluminum, Gordon Kenneth Gregory

Bachelors’ Theses

The problem of the analysis of brass and bronze for aluminum is one that has received the attention of analytical chemists for decades. The problem was originally proposed to me by Mr. H.E. Gregory of the American Brass Company. Since there appears to be no direct way of determining aluminum in brass and bronze, this thesis will concern itself with a comparison of four methods of determination with emphasis on their relative advantages and disadvantages. The gathering and arranging of the steps in the methods were done by the author, although the steps themselves have been described in chemical literature.

A Study Of The Equilibrium Distribution Of A Solute Between Two Immiscible Solvents, Francis A. Smith

Bachelors’ Theses

Because of the wide application of Distribution Law, for it should hold for the distribution of a dissolved substance between any two phases, for instance, liquid-liquid, gas-liquid, liquid-solid, and so forth, this subject was choosen for further investigation. The tendency for a solute to distribute itself between two immiscible solvents, so that the concentration ratio is a constant, is a direct consequence of the thermodynamic requirements for equilibrium. The reactions of various organic and inorganic acids distributed between water and several organic solvents will be studied.

Determination Of Saponification Rate By Change In Hydrogen Ion Concentration Measured With Quinhydrone And Glass Electrodes, Richard Porter

Bachelors’ Theses

The measurement or hydrogen ion concentration is becoming more important in all the fields of chemistry since the states or many chemical systems can to some extent be defined by their hydrogen ion concentration. If the hydrogen ion concentration or a particular solution can be measured accurately, in many cases other important relations and quantities may be determined. Methods or measurement are therefore important instruments or investigation.

When an ester is saponified by an alkali, the hydrogen ion concentration increases as the reaction proceeds. Thus, it the hydrogen ion concentration can be calculated at different intervals of time, some knowledge …

Preparation And Properties Of Diethylene Glycol Fumarate Resin, Marian Sargent

Bachelors’ Theses

Fumaric acid, an unsaturated acid , condensed with diethylene glycol forms diethylene glycol fumarate, a resinous product of high molecular weight. This reaction is typical of condensation reactions. Since this is only the first step in making suitable finished products, the author wished to make a study of the preparation and properties of this condensation product and determine which of the known polymerizing agents were best suited for practical use.

Concrete And Cement Surface Coatings, Gabriel J. Popovich

Bachelors’ Theses

It has been with difficulty that precise information of any kind regarding the surface coating of concrete and cement finishes had been found. In fact, there was limited information to be found after 1930. Having but a short time to conduct any research, it was impossible to delve too deeply into this branch of the thesis. It is sincerely hoped that in the very near future a more thorough, extensive and comprehensive study can be made on this subject. The purpose of this thesis is to determine the best composition of concrete and the best surface coating for it and …

An Experimental Study Of The Destruction Distillation Of Corn Cobs, Wendall Lee Perry

Bachelors’ Theses

The utilization of waste products is daily becoming more and more important. It has always been a big problem of industry to utilize its waste material; and as a result, limitless effort has been spent in the attempt to stress utility and economy in all forms of production. Under ordinary circumstances, the utilization of many waste products has been disregarded because of the large expense involved; but in critical times such as the present, expense becomes a secondary issue, and the actual production of necessary material becomes foremost. It is true that the waste connected with large industries is very …