Fabrication methods for lithium drifted surface barrier silicon detectors.
Fabrication methods for lithium drifted surface barrier silicon detectors, discussing lithium diffusion, stain etching, preparation for and final etch
LITHIUM↗
SEARCH · Engineering Papers
Results for “Effective diffusivity”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Free-molecule flow and surface diffusion through slots and tubes A summary
Free molecule flow and surface diffusion through tubes and two-dimensional slots
FREE FLOW↗
Estimates of local and average fuel temperatures in a gaseous nuclear rocket engine
Diffusion analysis on radiant heat transfer from gaseous nuclear fuel container to annulus of flowing hydrogen
NUCLEAR FUEL↗
On the determination of the view function to the images of a surface in a nonplanar specular reflector.
View function to images of surface in nonplanar specular reflector determined by general mathematical expressions
IMAGING TECHNIQUE↗
Factors affecting the adhesion of titanium and molybdenum couples.
Metallic adhesion between Mo-Mo and Ti-Ti couples, showing contact resistance useful in determining contamination at conducting interface
SURFACE DIFFUSION EFFECT↗
A balloon-borne diffusing system for infrared radiation from 1 mu to 5 mu.
Balloon-borne diffusing system designed to measure absorption of minor atmospheric constituents, as sun set and passed below horizon
SOLAR RADIATION↗
Present status of lithium-diffused silicon solar cells.
Spontaneous annealing models of lithium- diffused Si solar cells, discussing defect compensation and metastable defect formation
SOLAR CELL↗
Diffusive separation in shock waves and freejets of nitrogen-helium mixtures.
Diffusive separation effects measured in shock waves and underexpanded freejets for nitrogen- helium mixtures by electron beam techniques
Sebacher, D. I.↗
Discussion of ''A model for concentrated interstitial solid solutions - Its application to solutions of carbon in gamma iron.''
Interstitial solid solutions models, noting thermodynamic activity of carbon in austenite and dual site effects on diffusion kinetics
Aaronson, H. I.↗
Venturi meter with separable diffuser.
Venturi meter with separable diffuser and radial outward step at transition from throat to diffuser, noting effect of step on efficiency
Dudzinski, T. J.↗
Venturi meter with separable diffuser.
Venturi meter with separable diffuser and radial outward step at transition from throat to diffuser, noting effect of step on efficiency
Dudzinski, T. J.↗
Nucleosynthesis in neutron star atmospheres
Neutron star atmospheric composition as function of time, including effects of diffusion, cooling and nucleosynthesis
Rosen, L. C.↗
Thermal emission from grains in H-II regions
H II region dust grains thermal emission, examining effect on diffuse nebulae
Krishna Swamy, K. S.↗
A model for analysis of the temperature field downstream of a heated jet injected into an isothermal crossflow at an angle of 90 deg
The temperature distribution downstream of a heated jet entering an isothermal crossflow at an angle of 90 deg is predicted using two conduction models with energy sources above the point of injection, in one case a point source and in the second a line source. The models use effective turbulent diffusivities that are determined empirically from previous measurements. Temperatures predicted by the models are compared to experimental results.
Eriksen, V. L.↗
Investigation of the Ignition and Burning of Materials in Space Cabin Atmospheres. Part 2: Ignition of a Combustible Mixture by a Hot Body with the Effects of Gravity
The ignition of a combustible gas mixture by a hot cylinder under the effect of a gravity field for steady state conditions is examined. For this purpose a horizontal cylinder is considered with gravity as a parameter together with a finite chemical reacting flow generated by free convection with the additional effect of diffusion. Both mass transfer and zero mass transfer cases are considered. By defining an ignition criterion the surface temperature and species are obtained from the analysis as a function of the gravity field. It is supposed that at the point of ignition the heat evolved in the gas is sufficiently high to attain a sustained combustion without any energy from the hot cylinder.
Lew, H. G.↗
Galactic cosmic ray modulation from 1965-1970.
Numerical solutions of the cosmic-ray equation of transport within the solar cavity and including the effects of diffusion, convection, and energy losses due to adiabatic deceleration, have been used to reproduce the modulation of galactic electrons, protons, and helium nuclei observed during the period from 1965 to 1970. Kinetic energies between 10 and 10,000 MeV/nucleon are considered. Computed and observed spectra are given for the years 1965, 1968, 1969, and 1970 together with the diffusion coefficients. These diffusion coefficients are assumed to be of separable form in rigidity and radial dependence, and are consistent with the available magnetic-field power spectra. The force-field solutions are given for these diffusion coefficients and galactic spectra and are compared with the numerical solutions. It is shown that the energy losses and convection lead to near-earth nuclei spectra at kinetic energies less than or equal to 100 MeV/nucleon in which the differential intensity is proportional to the kinetic energy with little dependence on the form of the galactic spectrum. This dependence is in agreement with the observed spectra of all species of atomic nuclei and it is argued that this provides strong observational evidence for the presence of energy losses in the propagation process, and for the exclusion of low-energy galactic nuclei from near earth.
Urch, I. H.↗
Linear viscous stability theory for stably stratified shear flow - A review.
In this paper the linear viscous stability theory for stably stratified parallel shear flow is reviewed and some new results are presented. Attention is focused on recent work on unbounded flows with emphasis placed on results which demonstrate apparent destabilizing effects of diffusivity which lie beyond the scope of inviscid theory. In particular it is shown that self-excited disturbances may exist with phase speeds lying outside the range of basic flow speed and that with strong thermal diffusivity, instability may occur even though the local Richardson number exceeds 0.25 throughout the flow.
Gage, K. S.↗
Concentration changes during eutectic solidification
Thermotransport (or thermal diffusion, Soret effect) is shown to cause significant amount of segregation during the directional solidification of aluminum-copper eutectic. The concentration changes are predicted quantitatively and they are a function of temperature gradient, rate of melting and solidification and the time of soaking. There is a fair agreement between the experiments and calculations. A process is suggested where these concentration changes may be minimized.
Bhat, B. N.↗