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Articles 2551 - 2571 of 2571
Full-Text Articles in Chemistry
Multiple Trace Element Assay By X-Ray Fluorescence, Richard Pierre Koshakji
Multiple Trace Element Assay By X-Ray Fluorescence, Richard Pierre Koshakji
Archived Theses and Dissertations
No abstract provided.
Use Of Neutron Activation Analysis In The Study Of Biological Disposition Of Antimony Compounds, Moustafa Mahmoud Mansour
Use Of Neutron Activation Analysis In The Study Of Biological Disposition Of Antimony Compounds, Moustafa Mahmoud Mansour
Archived Theses and Dissertations
No abstract provided.
Elementary Chemical Calculations, Edward S. Amis
Elementary Chemical Calculations, Edward S. Amis
Journal of the Arkansas Academy of Science
No abstract provided.
Benzoylation Studies With A Compound Reported To Be Benzoyl Acid Sulfate And Analytical Studies On The Sample, Robert J. Peanasky
Benzoylation Studies With A Compound Reported To Be Benzoyl Acid Sulfate And Analytical Studies On The Sample, Robert J. Peanasky
Bachelors’ Theses
A very valuable reagent in organic characterization work is benzoyl chloride. By interacting benzoyl chloride with any one of the general classes of compounds termed phenols, alcohols, and amines, solid and very satisfactory derivatives are usually produced. However, the action of this compound occurs rather slowly and the operator, unless especially careful, suffers from the lachrimatory effects of the reagent, benzoyl chloride. A sample was submitted to my major professor, Dr. C. R. Haymaker, by Gene LaFave who claimed that it was benzoyl acid sulfate. This compound was a solid not difficult to manipulate in contradistinction to the lachrimatory liquid …
Statistical Evaluations Of Copper Determination, Waldemar A. Rosenthal
Statistical Evaluations Of Copper Determination, Waldemar A. Rosenthal
Bachelors’ Theses
In the field of applied Analytical Chemistry, where the amount of material is continually being determined, it is valuable to know whether or not the particular method in use is both accurate and precise. Basic course work in college provided the author an appreciation of numerical facts, but there always remained unanswered questions as to how these numerical facts could be employed to best represent the correct results. The difficulties were resolved by this thesis which will show how the evaluation of numerical data was considered with reference to the method used in determining the amount of copper present in …
Statistical Evaluation Of Laboratory Data Obtained From Two Methods Of Volumetric Analysis Of Titanium Compounds, Louis S. Winter
Statistical Evaluation Of Laboratory Data Obtained From Two Methods Of Volumetric Analysis Of Titanium Compounds, Louis S. Winter
Bachelors’ Theses
Titanium at last has entered the sphere of scientific practicality and general usefulness. It has overcome its position as an orphan of chemical interest and has been showered with the foistings of many industries. With this in mind, it is soon evident that a rapid and feasible system of analysis must be set up. Titanium presents a number of problems in the field of analytics, which are seldom, if ever, encountered when dealing with the commoner elements as iron, copper and tin. The purpose here is to study two methods of determination from the many which chemists have suggested and …
The Preparation Of Ammonium Tetrachloro Diiodo Stannate, Stanley M. Polewski
The Preparation Of Ammonium Tetrachloro Diiodo Stannate, Stanley M. Polewski
Bachelors’ Theses
The commercial application of mixed halogen compounds in comparison to that of mono-halogen compounds is very limited. It is probably for this reason that the amount of work done in the attempt to prepare mixed halogen compounds has been very small. The author has tried, in a small way, to help fill this large gap by attempting to prepare the compound, ammonium tetrachloro diiodo stannate.
The Determination Of Interfacial Tension Using Pendant Drop Method, Katherine Tellor
The Determination Of Interfacial Tension Using Pendant Drop Method, Katherine Tellor
Bachelors’ Theses
Boundary tension is a measure of the free energy of a fluid interface. It is a term derived from the superficial analogy between the surface of a liquid and a stretched membrane. Just as the potential energy of a fluid mass in foot pound per pound is spoken of as a "head" in feet, so it is useful to speak of free energy of a fluid surface in ergs per square centimeter as a "tension" in dynes per centimeter.
The Effect Of Time, Temperature, And Pressure On The Hydrogenation Of A Mixture Of Linoleic And Oleic Acids, Gordon S. Wepfer
The Effect Of Time, Temperature, And Pressure On The Hydrogenation Of A Mixture Of Linoleic And Oleic Acids, Gordon S. Wepfer
Bachelors’ Theses
During the past few years interest and experimentation in the field of hydrogenation of different fats and oils has increased enormously. Strides made in the oil-hardening industry have surpassed all expectations. These advances were brought about by simplifying old methods and creating new ones. The probable reasons for this impetus in research is due to the fact that unexpected uses for hydrogenated oils and fats have been found and will continue to be found. With the increase in use of these products the market for them will also increase. Recently, the resin industries have produced useful products by condensing pure …
A Study Of Resins From Carbohydrates, Edward F. Sullivan
A Study Of Resins From Carbohydrates, Edward F. Sullivan
Bachelors’ Theses
The availability of large amounts of carbohydrates, and the need in the past years of larger markets for the available supplies of sugar have lead a number of sugar companies to investigate the possibilities of synthetic resins from carbohydrates. Although in the last ten or twelve years, a number of steps have been taken in the investigation of sugar resins, the information available has been restricted to a few patents. Consequently, information on the chemistry of the problem has been neglected. Thus, this work, for the most part, covers partially the possibilities of producing alkyd resins from saccharides, as well …
Modification Of The Qualitative Procedure For Lead, L. B. Roberts, Edwin Roberts
Modification Of The Qualitative Procedure For Lead, L. B. Roberts, Edwin Roberts
Journal of the Arkansas Academy of Science
No abstract provided.
A Method For Comparing And Measuring The Drying Time Of Glues, William C. Strutz
A Method For Comparing And Measuring The Drying Time Of Glues, William C. Strutz
Bachelors’ Theses
The measurements or quality in glue testing are arbitrary and are of value only when compared to a standard glue or when comparing one glue to another. Glues have been used for hundreds of years, but it has been only in the last forty or fifty years that any scientific investigations of any consequence have been made. Prior to this time glues were made by rule of thumb by practical men who learned the art of glue making from other practical men in the business and by contact with the industry. "When the United States entered the Great War and …
The Preparation Of Calcium And Barium Gluconate, Ronald Anthony Plzak
The Preparation Of Calcium And Barium Gluconate, Ronald Anthony Plzak
Bachelors’ Theses
The privilege of working on this subject is one which the author has sincerely appreciated, as it has given him the opportunity of incorporating many of the more recent contributions along the line of oxidizing aldose sugars. In reviewing these contributions, he has abstained from conveying an impression of finality and has attempted to show the many possibilities which the free sugar acids offer for the future. The experience of the last few years has proved that even long-cherished conceptions and apparently well-established facts may at any time undergo drastic revision. For this reason, the author has referred directly to …
A Comparison Of The Caffeine Content Of Various Coffees, Emil J. Petrusek
A Comparison Of The Caffeine Content Of Various Coffees, Emil J. Petrusek
Bachelors’ Theses
Coffee must be rated as one of the most important commodities in the commercial world due to the statistics or output and consumption. There are various brands and kinds of coffee produced by the different growers and roasters. Now to sell the brands, the various concerns base their advertising upon the flavor and price of the coffee. It is a fact that the flavor of coffee is in some way affected by the caffeine present. One popular brand is advertised as decaffeinated, that is, the caffeine has been removed. Confronted with these facts, it occurred to the author to test …
The Extraction Of Tantalum And Columbium From Tantalite, Stanley P. Wisniewski
The Extraction Of Tantalum And Columbium From Tantalite, Stanley P. Wisniewski
Bachelors’ Theses
In the summer of 1932, the Milwaukee Public Museum, sent an expedition to the Bad Lands and Black Hills of South Dakota, under the direction of Dr. Ira Edwards, Curator of Geology in that institution. It was at this time that the author, a member of this group, while studying the pegmatites of the Black Hills, became interested in the tantalum-columbium bearing minerals of that region, namely tantalite and columbite. At that time the writer made a detailed mineralogical study of these two minerals, as well as a thorough investigation of their occurrence in that region. In the fall of …
Wax Analysis With Special Reference To Montan, Spermaceti, And Chinese Insect Wax, Margaret M. Plonsker, Margaret E. Seippel
Wax Analysis With Special Reference To Montan, Spermaceti, And Chinese Insect Wax, Margaret M. Plonsker, Margaret E. Seippel
Bachelors’ Theses
The presentation of this thesis under joint authorship finds its justification in the fact that much of the experimental work, though performed individually, is of such a nature as to warrant a unified description. In this way the reader is afforded a better representation and clearer conception of the problem, and a substantial guide for further investigation. Though much work has been done in the field of wax analysis, little is known of the higher fatty acids and alcohols of many of the waxes. Their isolation has been infrequent, and few if any of their derivatives have been formed. It …
Hardness And Porosity In Chromium Plating, Waldemar Wick
Hardness And Porosity In Chromium Plating, Waldemar Wick
Bachelors’ Theses
In recent years chromium plating has been subjected to much research due to its ever-increasing demand. The results of these investigations have demonstrated the valuable properties of this plate. Of its many advantageous properties, hardness is one of the outstanding ones, but its application in industry is as yet not fully realized. This being due to the fact that it is difficult to produce a plate that is uniform and does not chip. Many chemists have investigated the porosity of the chromium plate in order to produce a coating that could be used for protective purposes, but there seems to …
The Study Of The Effects Of Different Metallic Soaps On The Water Content Of Water-In-Gasoline Emulsions, Lynn D. Wilson
The Study Of The Effects Of Different Metallic Soaps On The Water Content Of Water-In-Gasoline Emulsions, Lynn D. Wilson
Bachelors’ Theses
The study of emulsions and emulsification is of very great theoretical and practical interest. From the standpoint of pure science it throws much light on the problems of surface tension, surface concentration, absorption, surface films, electrical double layers. Brownian movement, and the general theory of disperse systems and colloids. It is also of importance in biological science, e.g., the adsorption of fats and the permeability of membranes. When industrial and applied science are considered, it is remarkable how many subjects of interest and importance are dependent on a knowledge of the formation, behavior, and stability of emulsions. In this connection, …
A Study Of Phytosterol Obtained From Cocoa Beans And Cocoa Butter, Norman Anthony Pokorny
A Study Of Phytosterol Obtained From Cocoa Beans And Cocoa Butter, Norman Anthony Pokorny
Bachelors’ Theses
Despite the fact that considerable work has been done on cholesterol, relatively little is known about its isomer, phytosterol. Both cholesterol and phytosterol belong to the general group of sterols. Cholesterol is described as an aromatic sterol, a mono~atomic secondary alcohol, containing an iso-propyl and a vinyl group, with a terpene-like structure. Cholesterol was first discovered by Conradi in 1775, then by Gren (1788) in biliary calculi. In 1785 Fourcroy isolated cholesterol from gall-stones, one variety of which is composed almost wholly of it, but it was confused with adipocere, until Chevreul (1814) discovered its true nature, when he declared …
The Determination Of Sulphuric Acid In The Presence Of Iron, Louis George Karl. Clarner Jr.
The Determination Of Sulphuric Acid In The Presence Of Iron, Louis George Karl. Clarner Jr.
Student and Lippitt Prize Essays
This essay attempts to determine the best way to detect sulfuric acid in the presence of iron by investigating the already existing methods and reviewing other chemists’ procedures.
Wearable Electrochemical Sensors For Monitoring Performance Athletes, Kevin J. Fraser, Vincenzo F. Curtin, Shirley Coyle, Benjamin Schazmann, Robert Byrne, Fernando Benito-Lopez, Roisin M. Owens, George C. Malliaras, Dermot Diamond
Wearable Electrochemical Sensors For Monitoring Performance Athletes, Kevin J. Fraser, Vincenzo F. Curtin, Shirley Coyle, Benjamin Schazmann, Robert Byrne, Fernando Benito-Lopez, Roisin M. Owens, George C. Malliaras, Dermot Diamond
Conference Papers
Nowadays, wearable sensors such as heart rate monitors and pedometers are in common use. The use of wearable systems such as these for personalized exercise regimes for health and rehabilitation is particularly interesting. In particular, the true potential of wearable chemical sensors, which for the real-time ambulatory monitoring of bodily fluids such as tears, sweat, urine and blood has not been realized. Here we present a brief introduction into the fields of ionogels and organic electrochemical transistors, and in particular, the concept of an OECT transistor incorporated into a sticking-plaster, along with a printable “ionogel” to provide a wearable biosensor …