A densitometer to be used for liquids at temperatures up to ca. 1000°C and maintained in an inert atmosphere was constructed. The hydrostatic weighing method of Kohlrausch was chosen as the method most readily adaptable to the conditions imposed. This method utilises the buoyancy principle of Archimedes. The plummet was suspended from one arm of an analytical balance and immersed in the sample contained in the densitometer tube. The apparent loss in weight of the plummet upon immersion was measured by a chainomatic balance. The entire apparatus was made gas-tight; observations and manipulations of the balance were made through gas-tight seals.
The depositional style, biostratigraphy and burial history of the Late Early Pliocene, Moruga Group were studied in outcrop and the subsurface, along the south coast of Trinidad to determine its depositional environments, sediment sources, geologic age, and diagenetic history.
Slaty cleavage exposed in the fine-grained metasediments of western Ocoee Gorge, Tennessee is characterized by zones enriched in cleavage-parrallel white mica (P domains), alternating with zones enriched in quartz and feldspar and in which phyllosilicates are bedding-parallel (Q domains). This domainal fabric appears to develop by growth of new mica from mica components carried in a moving fluid. Solid state recrystallization of clays and mica may also have contributed to the development of the fabric, but little, if any, mechanical rotation or passive concentration of mica grains occurred. Both P domain morphology and mineralogical differences between P and Q domain phyllosilicate populations suggest that nucleation and growth of P domains may involve the expulsion of fluids, during diagenesis and low-grade metamorphism.
This thesis presents detailed calculations of the dosage to the metaphyses of the distal femur and proximal tibia and fibula of two children, ages 4 and 13. Parameters studied for each child include: mass and dimensions of the growth plate area; effective half-life and cumulated activity for 99mTc-EHDP; and mean dose per unit cumulated activity for the disc geometry of the metaphyses. Consideration is given to the use of the gamma camera for conjugate view counting. The effects of source to collimator distance, source length, and absorber thickness on the absolute count rate are evaluated. In addition, S factors for the various radionuclides have been calculated for spheres and ellipsoids of masses down to one gram.
The theory of the adsorption wave has in the past been developed for various cases depending upon the hypothetical mechanism for the kinetics of the adsorption process. The solution for the case of mass transfer controlling has appeared in the literature in the form of a standard chart which is convenient to use. In this paper the solutions for two other cases are presented. It is shown how in dimensionless form all three cases may be reduced to a single generalized theory. This treatment has many obvious advantages. This is especially so in problems of design and in studies of the kinetics of an adsorption process.
This paper consists of three parts. Part I is gravity wave growth, saturation and decay with height; part II reflection of gravity waves from critical layer using realistic background atmosphere and background wind; part III perturbation treatment of minor species' response to gravity waves. In part I by using Newtonian cooling and Rayleigh friction approximations and by considering only the average effects of turbulence on gravity waves we have derived an optical potential, with which we have studied the propagation of gravity waves and their reflections at every height level. We have found that reflections from higher level due to viscosity and heat conduction is so small that no ducting can be sustained. part II is the continuation of He Fan's work. In our work we adopt the same two parameter optical potential to model the gravity wave--critical layer interaction but we relaxed the conduction of isothermalness of the background and the linearity of the wind profile and we use the more realistic wind models, so our results should be more meaningful. We have found that the reflection coefficients of gravity waves from critical layer range from 5% to 25%, which should be measurable. In part III we develop a perturbation scheme with which it is possible to calculate the minor species response to any order in the linear gravity wave, including a secular component of the response which leads to wave-induced diffusion of minor species. Calculations to third order over a wide range of wave parameters show that the nonlinear effects can be substantial. A result is that care must be taken when analyzing data from minor species fluctuations, so that frequencies due solely to the nonlinear nature of the minor species response are not attributed to gravity waves.