Commentary on interstellar matter associated with 18 open clusters /

"September 1989"--Cover.

Bioastronautics data book.

"Published first as a pilot study in 1962 under the title: NASA life sciences data book."

Crimes against business : proceedings of a seminar held in Cincinnati, Ohio, September 25, 1975 /

Mode of access: Internet.

Transportation : current literature.

Mode of access: Internet.

An assessment model for atmospheric composition /

"Proceedings of a workshop held at NASA Goddard Institute for Space Studies, New York, New York, january 10-13, 1988."

Present state of knowledge of the upper atmosphere, 1990 : an assessment report : report to Congress /

Prepared on behalf of NASA at its Office of Space Science and Applications, Earth Science and Applications Division.

Metallurgy of molybdenum, niobium, and molybdenum-niobium alloys : a literature search /

"TID-3572."

Experiments with the Neher-Harper circuit /

Includes bibliographical references.

Electric time-switch for closing circuits at accurately regular intervals /

Includes bibliographical references.

Total cross sections of nuclei for 280 Mev neutrons.

The measurement of 28O-Mev neutron cross sections of various nuclei is described. The neutron beam used results from 340-Mev protons in the 184-in. cyclotron striking a 2-in. Be target. The neutron detector consists of a double coincidence anthracene scintillation counter telescope which counts recoil protons scattered at 15 deg from a paraffin cylinder placed in the collimated neutron beam. A 2-in. Cu absorber placed between the counters assures that only protons of energy greater than 250 Mev are counted. The cross sections for all nuclei measured from Li to Pb are smaller than the corresponding cross sections measured at 90 Mev by factors between 0.5 and 0.6.

A report on the three-dee, three-phase 20-inch cyclotron /

Unclassified Physics Distribution.

Reactions of uranium oxides and liquid nitrogen tetroxide /

Work performed at the Argonne National Laboratory.

Modulated entry /

"The technique of modulation, or variable coefficients, is discussed and the analytical formulation is reviewed. Representative numerical results of the use of modulation are shown for the lifting and nonlifting cases. These results include the effects of modulation on peak acceleration, entry corridor, and heat absorption. Results are given for entry at satellite speed and escape speed. The indications are that coefficient modulation on a vehicle with good lifting capability offers the possibility of sizable loading reductions or, alternatively, wider corridors; thus, steep entries become practical from the loading standpoint. The amount of steepness depends on the acceptable heating penalty. The price of sizable fractions of the possible gains does not appear to be excessive."

Investigation of the flow over simple bodies at Mach numbers of the order of 20 /

"It is shown that adequate means are available for calculating inviscid direct and induced pressures on simple axisymmetric bodies at zero angle of attack. The extent to which viscous effects can alter these predictions is indicated. It is also shown that inviscid induced pressures can significantly affect the stability of blunt, two-dimensional flat wings at low angles of attack. However, at high angles of attack, the inviscid induced pressure effects are negligible."

Summary report on neutron counter work /

"Dec. 1, 1943"