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Now showing items 81-90 of 179
The synthesis of some organophosphorus compounds and studies of the electron spin resonance spectra of their free radical anions
(1969)
This research describes the preparation of several new organophosphorus compounds. The e.s.r. (electron spin resonance) spectra of the radicals formed by the reaction of these and other organophosphorus compounds with ...
A study of the physico-chemical, mineralogical and engineering properties of fine-grained soil in relation to their expansive characteristics
(1969)
The soils engineer, unlike the structural engineer who works with steel or other elastic homogeneous materials, is faced with the problem of predicting the behavior of a material that has many complex properties. Soils are ...
Synthesis of some 1-aminophosphonic acids containing sulfur and heterocyclic rings
(1969)
Three 1-aminoalkylphosphonic acids were synthesized, utilizing the modified Curtius reaction. Two of the amino phosphonic acids synthesized are analogs of naturally occurring 1-aminoalkylcarboxylic acids. The 1-aminoalky ...
Electron microscopy investigation of the microstructure in sediment samples from the Gulf of Mexico
(1969)
Sediment samples were taken from Gulf of Mexico core. From these samples smaller ones were cut, freeze-dried, and impregnated with Maraglas, an epoxy resin. Ultrathin sections of the impregnated samples were cut and viewed ...
Modification of the edaphic factor by pricklypear cactus (Opuntia spp.)
(1969)
The effects of the intentional replacement of a cover of grass by one of pricklypear cactus on several soil properties were investigated. The study area was located on the King Ranch near Kingsville, Texas. The soils ...
Clay mineralogy of the southwestern Gulf of Mexico and adjacent river outlets
(1969)
This study of the clay mineralogy of the surface sediments in the southwestern Gulf of Mexico and its adjacent river outlets is based primarily on X-ray diffractograms of the less than 2u size fraction of 184 samples. ...
A comparison of the achievement of vocational automechanics students in first year day trade with students in first year industrial cooperative training
(1969)
The purpose of the study was to ascertain the comparative effectiveness of two different programs of vocational automechanics instruction. The two programs studied were vocational day trade automechanics and vocational ...
Interaction of micron-sized particles with nonuniform magnetic fields
(1969)
It was shown that nonuniform magnetic field forces are capable of propelling micron diameter iron particles from rest in a traveling wave tube. A force law was derived which qualitatively accounts for measured particle ...
Genetic behavior of economic and morphological characteristics influencing the yield and components of yield of rice (Oryza sativa L.)
(1969)
Genetic behavior and the relationships of quantitative and qualitative characters were studied using five United States rice varieties and the F2 and F3 generations of six of their crosses. Biometrical data indicated that ...
The differentiation of clostridial species by gas chromatography and deep agar colony morphology
(1969)
An investigation was initiated to determine the feasibility of using gas chromagography and deep agar colony morphology to aid in the identification of clostridial species. Five organisms were studied by gas chromatographic ...