Theoretical and experimental study of thermal contact resistance in a vacuum environment Semiannual status report no. 8, Jun. - Dec. 1965

Thermal contact resistance in vacuum environment using model prediction

Program for computing partial pressures from residual gas analyzer data

A computer program for determining the partial pressures of various gases from residual-gas-analyzer data is given. The analysis of the ion currents of 18 m/e spectrometer peaks allows the determination of 12 gases simultaneously. Comparison is made to ion-gage readings along with certain other control information. The output data are presented in both tabular and graphical form

Continuity of the von Neumann entropy

A general method for proving continuity of the von Neumann entropy on subsets of positive trace-class operators is considered. This makes it possible to re-derive the known conditions for continuity of the entropy in more general forms and to obtain several new conditions. The method is based on a particular approximation of the von Neumann entropy by an increasing sequence of concave continuous unitary invariant functions defined using decompositions into finite rank operators. The existence of this approximation is a corollary of a general property of the set of quantum states as a convex topological space called the strong stability property. This is considered in the first part of the paper.Comment: 42 pages, the minor changes have been made, the new applications of the continuity condition have been added. To appear in Commun. Math. Phy

A continuous source of translationally cold dipolar molecules

The Stark interaction of polar molecules with an inhomogeneous electric field is exploited to select slow molecules from a room-temperature reservoir and guide them into an ultrahigh vacuum chamber. A linear electrostatic quadrupole with a curved section selects molecules with small transverse and longitudinal velocities. The source is tested with formaldehyde (H2CO) and deuterated ammonia (ND3). With H2CO a continuous flux is measured of approximately 10^9/s and a longitudinal temperature of a few K. The data are compared with the result of a Monte Carlo simulation.Comment: 4 pages, 4 figures v2: small changes in the abstract, text and references. Figures 1 & 2 regenerated to prevent errors in the pd

Competitiveness, Tax Base Erosion, and the Essential Dilemma of Corporate Tax Reform

Label contradicts reality for the U.S. international corporate tax system. The U.S. system is typically labeled as a worldwide tax system with a statutory rate of 35%, both uncommon features among our trading partners. Yet these markers of the U.S. tax system do not accurately describe reality, where multinational firms routinely face far lower effective tax rates and little, if any, tax is collected on foreign income. Understanding this discrepancy between label and reality is essential to evaluate recent policy debates surrounding corporate inversions and the competitiveness of the U.S. international tax system. Although there is an essential policy tradeoff between “competitiveness” (an ill-defined term) and corporate tax base protection, there is little evidence that U.S. multinational firms have a competitiveness problem. However, new evidence shows that corporate tax base erosion is a large and increasing problem. There are several options for reform that would address corporate tax base erosion

Population and Productivity of a Flock of Giant Canada Geese in Northeastern South Dakota

Population and productivity studies of giant Canada geese (Branta canadensis maxima) were conducted in northeastern South Dakota in 1976 and 1977. One hundred ninety-three of 436 randomly selected sample quarter sections on the 5,459 km2 area contained potential goose nesting habitat in 1976. Forty-six pairs, 6 indicated pairs, and 6 single geese were found on these 193 quarter sections during the 1977 nesting season. The population was estimated to be 1,880 geese. Recommendations were to continue aerial surveys in the spring and late summer and to supplement them with annual searches of the sample quarter sections used in this study. One hundred three nests were found on islands and artificial nesting structures. Mean clutch size was 5.44 with no significant difference (P \u3e0.05) between the size of clutches on islands and artificial nesting structures. Nest success was 95% with no significant difference (P \u3e0.05) between islands and artificial nesting structures. Success of eggs in artificial nesting structures (91%) was significantly (

Palynostratigraphy and palynofacies of the early Eocene Gurha lignite mine, Rajasthan, India

A 105 m early Eocene section exposed in the Gurha mine in the Nagaur-Ganganagar Basin, Rajasthan, India, archiving remains of equatorial vegetation at a time of extreme global warmth and close to the onset of the India-Eurasia collision, is investigated using palynostratigraphic and palynofacies analyses. Four palynozones e.g., Palmidites plicatus Singh, Botryococcus braunii Kützing, Triangulorites bellus Kar and Ovoidites ligneolus are identified stratigraphically on the basis of abundance of these pollen taxa over others. The occurrence of taxonomically highly diverse angiosperm pollen in all the four palynozones attests to an extremely rich near-coastal tropical flora subject to frequent wildfires under a strongly seasonal precipitation regime. Palynotaxa characteristic of these palynozones are widely distributed in other early Paleogene sediments of India. Sedimentary organic matter (structured terrestrial, biodegraded, amorphous, grey amorphous, resins, charcoal/black-brown debris and algal remains) recovered from mire and lacustrine sediments are of terrestrial origin, recording fluctuations in burial anoxia and salinity. Episodes of elevated salinity are due either to seepage of marine waters and/or a periodic excess of evaporation over precipitation at times when the depositional system was closed

Finite difference solutions of the boundary layer equations

Feasibility of using film cooling as alternate thermal protection system for spacecraft atmospheric reentr

An Experimental and Theoretical Investigation of the Thermal Contact Resistance Final Report

Mathematical model of macroscopic elastic contact between mating members for predicting thermal contact resistance in vacuum environmen