High-temperature liquid-mercury cathodes for ion thrusters Quarterly progress report, 1 Dec. 1966 - 28 Feb. 1967

High temperature liquid mercury cathodes for ion thrusters - thermal design analysi

Comparison of Monomethylhydrazine/Hydroxypropylcellulose and Hydrocarbon/Silica Gels

Experimental studies have been performed to investigate rheology and droplet burning with different types of gelled propellants. Monomethylhydrazine has been gelled with organic hydroxypropylcellulose. JP-8 and RP-1 hydrocarbon gels have been produced with inorganic fumed silica particles. Rheological characterization showed the differences in terms of viscosity and yield stress behavior due to different types of gelling agents. Herschel-Bulkley and Carreau-Yasuda models have been used to characterize the gels with inorganic and organic gelling agents, respectively. First experiments with the Monomethylhydrazine/hydroxypropylcellulose gels showed a typical swelling process during combustion with a flexible viscous droplet surface. Contrary to that, the hydrocarbon/silica gels burned while a rigid silica structure was built, which remained unburned. Burning drop measurements have been compared to the d^2-squared law

Evaluating annual changes in soil productivity

Cover title."Revision of Bulletin 405."Includes bibliographical references

Wartime recommendations on the use of commercial fertilizer

Caption title.Digitized 2006 AES MoU

Evaluating annual changes in soil productivity

Cover title.Includes bibliographical references

Weed Control in Small Grain

This publication provides guidance on general control methods, herbicide facts and recommendations, cropping, and noxious weed control for spring and winter grains. It includes diagrams and tables for assistance in determining small grain growth stages, herbicide cost and quantity, and susceptibility of small grain varieties to certain chemical applications

Chemical Weed Control in Soybeans : 1989

This document covers a large number of chemical weed control options for soybeans in South Dakota for 1989. This Fact Sheet is designed to provide a summary of herbicide usage options. The chemical options are listed in a table, which is broken into a number of sections including, “Soybean Herbicides,” “Other Soybean Herbicides,” “No-Till Herbicides,” and “Special Weed Problems in Soybeans.

Chemical Weed Control in Soybeans : 1988

This document covers a large number of chemical weed control options for soybeans in South Dakota for 1988. This Fact Sheet is designed to provide a summary of herbicide usage options. The chemical options are listed in a table, which is broken into a number of sections including, “Soybean Herbicides,” “Other Soybean Herbicides,” “No-Till Herbicides,” and “Special Weed Problems in Soybeans.