Further laboratory studies of the roughness and suspended load of alluvial streams

A laboratory study was made to determine the variation with depth and velocity of the hydraulic and sediment transport characteristics of a constant-discharge flow. Eight experimental runs were performed in a 60-foot long, 33.5-inch wide recirculating laboratory flume. The unit discharge for all runs was 0.50 cfs per ft. and the velocity was varied from 0.91 to 2.21 fps, corresponding to a change in depth from 0.550 to 0.228 ft. The bed sand used for these experiments had a geometric mean sieve diameter of 0.142 mm and a geometric standard deviation of 1.38. As the velocity was increased, the bed form changed from a dune-covered configuration to a flat bed, with sand waves occurring at intermediate velocities. It was found that for the unit discharge and bed sand used in this investigation, two different velocities and sediment transport rates are possible for a given slope, or a given bed shear velocity; however, this multiplicity is possible only in the range of slope and shear velocity where major changes in the bed configuration occur since it is a result of large variations in the bed roughness. Therefore the slope or shear velocity cannot logically be used as an independent variable since neither of these quantities uniquely determines the velocity or transport rate. However, if the velocity is used as the independent variable for a constant-discharge flow, the slope, shear velocity, and friction factor are all uniquely determined. The sediment transport rate was found to be a single-valued, uniformly increasing function of velocity, and it can therefore be used in place of the velocity as the independent variable. A comparison of data from this investigation with data from previous investigations which used the same sand showed that even a small decrease in the amount of fine material in the bed sand can have a significant effect on the transport rate. However, even relatively large changes in the standard deviation of the bed material have a small effect on the friction factor

Lecture notes on sediment transportation and channel stability

These notes have been prepared for a series of lectures on sediment transportation and channel stability given by the authors to a group of engineers and geologists of the U. S. Department of Agriculture assembled at Caltech on September 12-16,1960. The material herein is not intended to serve as a complete textbook, because it covers only subjects of the one-week sequence of lectures Due to limitation of space and time, coverage of many subjects is brief and others are omitted altogether. At the end of each chapter the reader will find a selected list of references for more detailed study

President John F. Kennedy to Senator James O. Eastland, 28 November 1962

Copy typed letter signed dated 28 November 1962 from Kennedy to Eastland, re: Eastland\u27s birthday. Original removed to VIP Restricted Access location.https://egrove.olemiss.edu/joecorr_d/1012/thumbnail.jp

President John F. Kennedy to Senator James O. Eastland, 26 October 1962

Copy typed letter dated 26 October 1962 from Kennedy to Eastland, re: 28 September telegram, University of Mississippi integration crisis. Original removed to VIP Restricted Access location.https://egrove.olemiss.edu/joecorr_d/1013/thumbnail.jp

President John F. Kennedy to Senator James O. Eastland, 10 April 1962

Copy typed letter signed dated 10 April 1962 from Kennedy to Eastland, re: S. 1552, food and drug legislation, consumer protection, patents; 3 pages. Original removed to VIP Restricted Access location.https://egrove.olemiss.edu/joecorr_d/1010/thumbnail.jp

Book Review

A substantial body of literature has been written about the Senate, but Citadel performs a special role in, for the first time, portraying the Senate as an organic unit. The anecdotes and personal recollections liberally used by the author aptly illustrate the various broad principles and details he has fashioned into an image of a vital, living force in our nation\u27s growth and development, the United States Senate. Those anxious to understand the operations of the Senate and to gain an insight into the complex interplay of personalities and forces that lie behind the usual surface view of this unique body will find what they seek in William S. White\u27s Citadel

NASA/DOD Aerospace Knowledge Diffusion Research Project. Report 9: Summary report to phase 3 faculty and student respondents including frequency distributions

This project is designed to explore the diffusion of scientific and technical information (STI) throughout the aerospace industry. The increased international competition and cooperation in the industry promises to significantly affect the STI standards of U.S. aerospace engineers and scientists. Therefore, it is important to understand the aerospace knowledge diffusion process itself and its implications at the individual, organizational, national, and international levels. Examined here is the role of STI in the academic aerospace community

NASA/DOD Aerospace Knowledge Diffusion Research Project. Report 14: Engineering work and information use in aerospace: Results of a telephone survey

A telephone survey of U.S. aerospace engineers and scientists who were on the Society of Automotive Engineers (SAE) mailing list was conducted between August 14-26, 1991. The survey was undertaken to obtain information on the daily work activities of aerospace engineers and scientists, to measure various practices used by aerospace engineers and scientists to obtain STI, and to ask aerospace engineers and scientists about their use of electronic networks. Co-workers were found important sources of information. Co-workers are used to obtain technical information because the information they have is relevant, not because co-workers are accessible. As technical uncertainty increases, so does the need for information internal and external to the organization. Electronic networks enjoy widespread use within the aerospace community. These networks are accessible and they are used to contact people at remote sites. About 80 percent of the respondents used electronic mail, file transfer, and information or data retrieval to commercial or in-house data bases