[en] Our progress is described in detail in 11 scientific articles, listed under Publications in Sec. III. Our main results are in the following three areas: 1) high-temperature behavior of a hydrogen-metal system; 2) low-temperature behavior of a hydrogen-metal system; 3) transport theory. The progress made during this period has been particularly significant in showing the nature of mechanisms of diffusion. Our advances have made it possible to study some of our long-range objectives put forth in our initial proposal

No abstract available

[en] The main results are in the following three areas: (1) examination of a diffusion model for PdH system, (2) connection between the diffusion model and other physical models, (3) related problems. Advances made during the third year of this project, particularly in understanding the physical model for hydrogen diffusion, make it possible to begin to meet some of the long-range objectives described in the initial proposals of 1977-1978

[en] The main results are in the following 3 areas: (1) static and dynamic properties of the hydrogen diffusion model; (2) exact asymptotic solutions of the model; (3) new physics of the lattice hydrogen. The progress made during this period has been particularly significant. The hydrogen diffusion model has brought to light a number of puzzling features of hydrogen metal systems. These advances have made it possible now to begin to study some of the long-range objectives put forth in the initial proposal

[en] For the purpose of studying the mechanisms of hydrogen diffusion in separation devices e.g. transition-metal membranes, we have developed a microscopic dynamic model appropriate for describing the nonequilibrium statistical mechanics of hydrogen-in-a-metal. Using this model we have carried out a detailed analysis to obtain the autocorrelation function of density fluctuations in the model. Our model is built on the physical idea that, at low temperatures, spin clusters are the basic units or aggregates of transport. Our work can explain the reversed isotope effect in diffusion. We have also obtained an expression for the relative diffusivity, verifiable by experiments with tritium in metals. Our notion of spin clusters is novel. There is some evidence of their existence. The interstitial spin clusters are comparable to atomic and nuclear spin clusters, the only other natural spin clusters. Our demonstration of a long-time tail in the autocorrelation function is also novel. Diffusion can be anomalous if long time tails exist, a current topic in nonlinear behavior of fluids and solids. Our progress has been made possible by our development in the mathematical method of solving the generalized Langevin equation. This method is applicable to any time-dependent quantum many-body model. The underlying basis of this method is our discovery of a new orthogonalization process in Hilbert space, first since Gram and Schmidt over 100 years ago. Our process is simpler if Hilbert space is realized as is for all physical problems. To demonstrate the power and utility of our method we considered a well established model of metals, thereby discovering the existence of a low-frequency electronic mobility. This kind of intrinsic conductivity should exist in ensembles of all light particles, hence also relevant to hydrogen and its isotopes in metals

[en] A detailed, nonlinear, many lump, moving boundary dynamic model for a helical coiled once-through steam generator with nonuniform tube cross section is developed. Six flow regimes are employed in the model; each regime may consist of more than one section. The responses for two lumping cases (i.e., two sets, each with a different number of sections in the model) are compared with the same perturbations. Bases for selection of the number of sections and the calculational time step are suggested. The steady state calculation for generating the state variable distributions along the tube coordinate is developed. Information obtained from the steady state distributions is compared with transient response at the final observation time. The comparisons for all individual steam generator input perturbations are satisfactory. Confidence in the correctness of the steady state calculation is obtained from the comparison of the steady results with a set of design data. Nonlinearity of the steam generator responses is studied. Comparison of the transient responses with two other models is given. The Fort St. Vrain 330 MW(e) steam generator is used as the reference design for this study

[en] A review is presented of methods available for the calculation of suddenly applied forces possible in a LOCA from missiles, blast waves, fluid jet impingement, pipe whip and water-hammer. Comparisons with test data are used to indicate the applicability of these methods, and associated uncertainties. Major uncertainties are found to exist in the ability to predict fragment velocities and blast effects from rupture of systems containing pressurized steam-water mixtures, and the effect of break geometry on blowdown thrust forces. (author)

[en] Models of the thermal emission from dust within Bok globules are developed, assuming the heat source is the interstellar radiation field (IRF) and accurately solving the radiative-transfer problem using the half-range moment method in spherical geometry. The models are characterized by the central optical depth, the dust density distribution, and the grain type. The FIR flux spectrum and surface-brightness profile are calculated. The primary interest is in the thermalization efficiency of globules. Only globules containing amorphous dust grains are able to convert the incident IRF into FIR emission with the high efficiency implied by the observations. However, this is incompatible with the observed FIR emission with the high efficiency implied by the observations. However, this is incompatible with the observed spectra, which indicate the presence of crystalline silicate grains. Perhaps these conclusions could be reconciled by the addition of an internal radiant heat source, such as a protostar. This would also explain why many globules appear to emit more photons than they can possibly absorb from the IRF. 32 references

[en] Adsorbed hydrogen in a transition metal may be to a first order approximation regarded as a system of protons interacting pairwise via long-range forces. By limiting momentum transfers in proton-proton scattering to small wavevectors, the relaxation function for a many-proton system is obtained analytically by a method of recurrence relations recently developed by Lee. Other dynamical quantities including diffusivity are also obtained analytically

No abstract available