Preparation of low oxygen content yttrium fluoride

The purpose of this investigation was to determine the optimum conditions for the formation of very low oxygen. c. on tent yttrium fluoride

Microbiological study of imitation and filled dairy products and their components

Call number: LD2668 .T4 1969 M672Master of Scienc

Separation of niobium and tantalum - a literature survey

During recent years increased interest has been shown in the metal niobium. Because niobium has a high melting point (4376° F) and a low neutron cross-section, the Atomic Energy Commission has encouraged research on new methods of winning the metal from its ores with the ultimate hope of finding a process which would yield niobium metal at a reasonable price. The two areas of endeavor in which·the principal difficulties in finding such an economic process occur are the separation of tantalum from the niobium and the conversion of purified niobium salts to the metal. This report, then, was written to consolidate the more important information available in the literature on one of these troublesome areas, that of the separation of niobium and tantalum. It is to be noted, however, that all the references available in the literature on niobium-tantalum separation are not included in this report, but only those which appear to have the most usefulness for future endeavors on this problem

Effect of phosphate rock particle size on recovery of uranium from superphosphate

The tremendous domestic reserves of phosphate rock together with the large annual production of normal superphosphate from phosphate rock have made the recovery of the small amounts of uranium (0.01 to 0.02 percent) in phosphate rock during the production of superphosphate an important problem. At current superphosphate production rates there exists a uranium potential of approximately 1000 tons per year

Processing of monazite sands

For the past ten years, much effort has been expended by several research teams to develop an economic process for recovering thorium, rare earths and uranium from monazite sands. Recently, a process was developed at the Ames Laboratory which possessed many attractive features. The major disadvantage inherent to the process was the large cost for oxalic acid. The oxalic acid was used to precipitate rare earth and thorium oxalates from a sulfate and phosphate solution of these elements. The object of the oxalate precipitation was to separate the thorium and rare earths from uranium, sulfate and phosphate ions. Since this method for processing monazite sands was so attractive, concerted effort was made to discover a method whereby the oxalic acid could be recycled

Growth of gadolinium single crystals

Single crystals have become vitally important to many areas of research in metallurgy, engineering, physics and chemistry. With the introduction of theories about dislocations and their movement during plastic deformation of metals came a need for single crystals to test these theories. The fact that theoretical yield strengths are almost 1000 times higher than those normally observed needs to be explained to satisfy the curiosity of the metallurgist. The explanation may also have very practical applications. It is interesting to note that whiskers, metallic single crystals in tiny hair-like shape, do have strengths approaching the theoretical. Dr. Halden (13), manager of ceramics research at Stanford Research Institute, reports that techniques are being developed to use this strength in composites and self-bonded structures

Taste acceptance in squirrel monkeys (Saimiri sciureus)

Six squirrel monkeys were presented with solutions representing the four primary tastes. The solutions included various concentrations of glucose or sodium saccharine (sweet), sodium chloride (salty), citric acid (sour), and quinine sulfate or sucrose octaacetate (bitter). A 24 hr two-bottle choice technique was employed. Amount of food, water, and solution consumed every 24 hr was recorded. The results showed that the maximum intake for glucose solution was with the 5.0% concentration, although maximum caloric intake was with the 1.25% concentration where there was a potentiation of food intake. Water was preferred over sodium saccharine at three of the four concentrations which were tested, and water was preferred over or equally to the concentrations of sodium chloride and citric acid that were used. However, quinine sulfate and sucrose octaacetate were preferred over or equally to water at most of the concentrations which were tested

Equilibrium distribution studies of dysprosium nitrate-erbium nitrate-nitric acid-tributyl phosphate systems

\u27!be equilibrium distribution of dysprosium nitrate, erbium nitrate, and nitric acid between water and tributyl phosphate was studied in this research. Separate equilibrium data were obtained for the distribution of dysprosium nitrate-nitric acid, erbium nitrate-nitric acid, and dysprosium nitrate-erbium nitrate-nitric acid mixtures. The equilibrium data were obtained by making single stage extractions from aqueous feed solutions using commercial grade tributyl phosphate. Equilibrium distribution of solutes was determined by analysis of each phase from the single stage extractions