NTWO - A nitrogen properties package

FORTRAN 4 subroutines to calculate thermodynamic and transport properties of molecular nitroge

Introduction to The Chinese and the Iron Road

Excerpt from The Chinese and the Iron Road: Building the Transcontinental Railroad, edited by Gordon H. Chang and Shelley Fisher Fishkin, with Hilton Obenzinger and Roland Hs

Conceptual study of on orbit production of cryogenic propellants by water electrolysis

The feasibility is assessed of producing cryogenic propellants on orbit by water electrolysis in support of NASA's proposed Space Exploration Initiative (SEI) missions. Using this method, water launched into low earth orbit (LEO) would be split into gaseous hydrogen and oxygen by electrolysis in an orbiting propellant processor spacecraft. The resulting gases would then be liquified and stored in cryogenic tanks. Supplying liquid hydrogen and oxygen fuel to space vehicles by this technique has some possible advantages over conventional methods. The potential benefits are derived from the characteristics of water as a payload, and include reduced ground handling and launch risk, denser packaging, and reduced tankage and piping requirements. A conceptual design of a water processor was generated based on related previous studies, and contemporary or near term technologies required. Extensive development efforts would be required to adapt the various subsystems needed for the propellant processor for use in space. Based on the cumulative results, propellant production by on orbit water electrolysis for support of SEI missions is not recommended

US Navy program in small cryocoolers

A Navy program to develop fractional-watt cryocoolers capable of operating below 10 K is discussed. Several varieties of Stirling coolers were built and are under evaluation. In addition, helium gas compressors designed for use with small, closed cycle Joule-Thomson coolers are under development. An overview of the technical aspects of the program are presented

Frances Carol Bishop

https://digitalcommons.georgiasouthern.edu/willowhillheritage-obituaries/1139/thumbnail.jp

Cedarville: A Tribute to Our Heritage

https://digitalcommons.cedarville.edu/cedarville_village_history/1007/thumbnail.jp

State College Times, October 11, 1932

Volume 21, Issue 11https://scholarworks.sjsu.edu/spartandaily/12780/thumbnail.jp

Choked flow of fluid nitrogen with emphasis on the thermodynamic critical region

Experimental measurements of critical flow rate and pressure ratio for nitrogen flowing through a nozzle are presented. Data for selected stagnation isotherms from 87.5 to 234 K with pressures to 9.3 MN/m2 are compared to an equilibrium model with real fluid properties and also a nonequilibrium model. Critical flow pressure ratio along an isotherm tends to peak while the flow rate indicates an inflection. The point is closely associated with the transposed critical temperature and represents a change in the fluid structure

Subjectship, Citizenship, and the Long History of Immigration Regulation

Aerial view of Cedar Lake and portions of Cedarville College. From the Strobridge Collection in the Centennial Library\u27s Archives and Special Collectionshttps://digitalcommons.cedarville.edu/cedarville_historical_images/1017/thumbnail.jp