Development of high temperature materials for solid propellant rocket nozzle applications

Aspects of the development and characteristics of thermal shock resistant hafnia ceramic material for use in solid propellant rocket nozzles are presented. The investigation of thermal shock resistance factors for hafnia based composites, and the preparation and analysis of a model of elastic materials containing more than one crack are reported

Development of high temperature materials for solid propellant rocket nozzle applications Quarterly progress report, 1 Jul. - 30 Sep. 1969

Refractory metal and graphite composite research for solid propellant rocket nozzle application

Middle Mississippian carbonates of the Illinois Basin : a seminar and core workshop, April 23rd and 24th, 1981, Mt. Vernon, Illinois

co-sponsored by the Illinois Geological Society and the Illinois State Geological SurveyOpe

Applications of Skylab EREP photographs to mapping landforms and environmental geomorphology in the Great Plains and Midwest

The following evaluations of Skylab photographs were undertaken: (1) the 1290 Skylab S190A and S190B photographs of Illinois, Iowa, Kansas, Missouri, Nebraska, and South Dakota were evaluated in detail in terms of coverage, cloud cover, photographic quality, endlap, detectability of roads and stereorelief, and utility for geomorphologic mapping, and (2) the utility of the Skylab photos were tested for interpretive analytic mapping of geomorphologic features over large areas representative of different parts of this region. Photointerpretative maps of analytic geomorphology were obtained for various test areas representative of the varied landscapes in the region. These maps are useful for regional land-use planning, ground-water exploration, and other environmental geomorphologic-geologic applications. Compared with LANDSAT-1 MSS images, Skylab photos afford almost as extensive overviews of large areas but in considerably greater detail, and for many SL photos, moderate stereorelief. However, repetitive multiseasonal, cloud-free coverage by high-quality photos is very limited and many areas have no coverage at all

An Objective test for junior high school woodwork

This thesis gives an account of the construction of an objective examination in woodwork. The test is planned for use wherever woodwork is taught in the seventh, eighth, and ninth grades. This would include the junior high school under the six-three-three plan of organization, the junior high school and the first year of senior high school under the six-two-four plan, and the ninth grade, and occasionally the seventh and eighth grades under the older eight-four-plan. In the last case, woodwork is taught in the fifth and sixth grades, this test may be used because it includes only the most fundamental principles. However, the test is not specifically designed for these grades and its use in them is not recommended. [Taken from Chapter I