Absolute low-pressure calibration system

McLeod gage is used as the primary reference standard in a system used for absolute calibration of vacuum gages in the very low pressure range. The system involves steady-state flow of a gas through a cascade of differentially pumped chambers or stages connected by precisely defined orifices

Research and development program on the use of counting techniques

Reducing noise in multiplier of quadrupole mass spectrometer when operating in ion counting mod

Program to produce a flight prototype cold cathode quadrupole mass spectrometer

Construction of cold cathode quadrupole mass spectrometer as flight prototyp

Construction of a breadboard electronics system for a light weight cold cathode quadrupole mass spectrometer Final report, 11 Dec. 1967 - 10 Oct. 1968

Construction of breadboard electronic system for cold cathode quadrupole mass spectromete

Design, fabrication, assembly and delivery of a laboratory prototype of a residual gas analyzer

The design, development, and testing of a wide mass range residual gas analyzer which will be one component of an integrated real time contamination monitor system are described. The instrument has been developed and tested to the laboratory prototype phase, demonstrating the performance that can be expected from a flight instrument of similar design. The instrument's analyzer is of the quadrupole type and a cold cathode ion source is employed as the ionizer. The associated electronics supply all necessary operating and mass sweep voltages for the ionizer, analyzer and electron multiplier ion detector. The instrument features a very fast linear electrometer with automatic range changing. The full mass range of 2 to 300 amu is automatically and repetitively scanned every sixty seconds and suitable telemetry outputs are provided for intensity and mass identification as well as a digital identification of the electrometer range

A study of the adhesion and cohesion of metals Third quarterly progress report, 9 Sep. - 9 Dec. 1965

Adhesion and cohesion of metal

A cold cathode ion source mass spectrometer employing ion counting techniques

Design and construction of mass spectrometer using cold cathode source of ions, quadrupole mass analyzer, and ion counting detector

A study of the adhesion and cohesion of metals Interim summary report, 9 Mar. 1965 - 9 Mar. 1966

Metal alloy adhesion in high vacuu

The role of pathology in an investigation of an outbreak of West Nile encephalitis in New York, 1999.

An outbreak of encephalitis occurred in New York City in late August 1999, the first caused by West Nile virus in North America. Histopathologic and immunopathologic examinations performed on human autopsy materials helped guide subsequent laboratory and epidemiologic investigations that led to identification of the etiologic agent