Research on the elastic stability of large shells

Tests were conducted to determine the elastic stability of large shell structures. The configuration of the shells and the instrumentation used in the measurements are described. The testing procedures are explained. Results of the stress analysis are plotted in polar graph form to show the areas of strain in micro inches at the outer surface of the skin and the inner lip of the stringer

The identification and correction of channel-to-channel phase differences within a data processing system

Data processing hardware was tested in order to determine the sources of channel time delay differences and mathematically characterize the differences. A procedure developed to detect and correct these delay differences was subjected to test data in order to verify its capability. Test results are presented

Method of making impurity-type semiconductor electrical contacts Patent

Fabrication of sintered impurity semiconductor brushes for electrical energy transfe

Improved molybdenum disulfide-silver motor brushes have extended life

Motor brushes of proper quantities of molybdenum disulfide and copper or silver are manufactured by sintering techniques. Graphite molds are used. These brushes operate satisfactorily for long periods in normal atmosphere or in a high-vacuum environment

A project to investigate mechanisms and methodologies for the design and construction of communicating concurrent processes in real-time environments

Research undertaken in 1979 into effective and appropriate mechanisms to aid in the design and construction of software for use in the flight research programs undertaken by NASA is presented

Radical-cation salts of BEDT-TTF with lithium tris(oxalato)metallate(III)

The first radical-cation salts in the extensive family (BEDT-TTF)x[(A)M(C2O4)3]·Guest containing lithium as the counter cation have been synthesized and characterised

Fremont\u27s Expeditions Through Kansas, 1842-1854

John Charles Fremont made five exploring expeditions through Kansas. The first three expeditions were made at the expense and under the direction of the United States Government. The two later ones were private ventures financed principally at the expense of Senator Thomas H. Benton, Fremont\u27s father-in-law, and himself. A full account of the five exploring expeditions could almost form a complete history of the Trans-Mississippi West during that time--June, 1842, to February, 1854. The purpose of the study was to examine these five expeditions as they apply to Kansas, and to determine what results were achieved by his travels and subsequent reports. Special emphasis was given to his accounts of the Kansas scene, especially his influence in changing the concept of \u27 the Great American Desert. A study was made of the available Fremont papers. The bulk of the Fremont personal papers were destroyed many years ago in a warehouse fire in New York. In writing the account of his five expeditions through Kansas various sources were used. Of the first two Fremont wrote official reports; the third he described in full in his Memoirs of My Life (1886); the fourth and fifth he left without official record, although his letters and documents help reconstruct the expeditions. Bigelow’s Life of Colonel Premont (1856) and Upham\u27s Life, Explorations, and Public Services of John Charles Fremont (1856) help, as secondary sources, to give us a graphic account of the fourth expedition. S. N. Carvalho in his Incidents of Travel and Adventure in the Far West gives the most complete and authentic account of the fifth expedition

Laminar separation bubbles in two and three dimensional incompressible flow.

PhDA theoretical and experimental study is made of the closed 'bubbles` of separated flow formed when a laminar boundary layer separates from an aerofoil surface and, after undergoing transition to turbulence, subsequently re-attaches. Attention is mainly confined to the so-called 'short' type of bubble, which is distinguished from the 'long' type by its relatively slight overall effect upon the pressure distribution. In Part I, a semi-empirical theory for the prediction of the growth and bursting of two-dimensional short bubbles is developed. The existing data concerning short bubbles are re-examined, with particular emphasis upon the conditions governing re-attachment. A criterion for the determination of turbulent re-attachment is proposed, and approximate quadrature methods developed for the calculation of the momentum thickness in the separated region. These results, together with am empirical formula for the determination of the position of transition, are combined with a simplified model of the pressure distritbution in the bubble region to predict the re-attachment position. It is found that, for a given imposed pressure distribution, there exists a Reynolds number at separation below which re-attachment is impossible. This is associated with the phenomenon of short bubble bursting. The predictions of the theory are in reasonable quantitative agreement with experiment. Part II deals with bubbles in three-dimensional flow. Experiments are described in which separation bubbles were produced using an apparatus closely simulating conditions near the leading-edge of a swept wing of infinite span. Measurements of surface pressure, mean velocity and turbulence level are presented, from which it is deduced that the bubble structure is similar to that of two-dimensional bubbles, apart from the existence of cross-flows in the shear-layer and a strong spanwise flow in the reverse-flow vortex. An extension of the two-dimensional bursting theory by means of the independence principle is in reasonable agreement with measured bursting parameters.Ministry of Technolog

The administrative, social and economic structure of the Durham bishopric estates, 1500-1640

A study designed to elucidate some of the special features and problems of ecclesiastical land ownership, through the medium of one of the leading English bishoprics, during a period of social and economic stress, coinciding with a phase of crisis and readjustment in the history of the Church. In spite of its palatinal jurisdiction Durham is found to be little different from the other bishoprics in terms of its temporalities. After a description of the bishopric estates and the manner of their administration, attention is turned to the phenomenon of an income which remained fairly static in an inflationary age, amidst conditions auguring growth. The bulk of the thesis is devoted to an examination of the resultant failure of the Bishops of Durham to become the improving landlords demanded by logic. Explanations are found in: the inadequacy of the antique administrative machinery as an instrument of improvement; the abandonment of entrepreneurial activity; the entrenchment of the tenantry behind beneficial conditions of tenure; the requirements of the patronage system made necessary by the Bishops' important, socio-political role, which put them at a disadvantage in management terms; the exploitation by powerful interests emanating from the State-Church relationship; the impediments to effective husbanding and regulation of resources inherent in the system of episcopal succession and the behaviour patterns characteristic of the episcopate; and the short comings of the counter-measures taken to arrest the administrative and economic defects. Overall it is clear that however desirable the efficient administration and improvement of the temporalities might have been, fulfilment of these twin objectives was rendered impossible by the power of the several countervailing considerations. In conclusion it is suggested that the Durham experience was fairly representative in its exposure to conditions which allowed for variation in detail within a framework of basic similarities

Perspectives of Associate Degree Nursing Students at Risk for Academic Problems

This quality improvement project focused on associate degree nursing students (ADN) at risk for academic problems in the community college setting. Understanding the supply, distribution, and educational requirements for registered nurses (RNs) is an important factor to ensure quality avenues for nursing programs to ultimately provide competent nurses to support the US health care system. The purpose of this project was to identify themes and patterns from the perspectives of ADN students as to what places him or her at risk for academic problems and how faculty could best intervene to help them become successful. Objectives for this project included: 1) Analyze the themes of the perceptions of ADN students self-identified as at-risk for academic problems, 2) Identify perceptions of students on how faculty can help them become successful, and 3) Compare and contrast identified themes with the literature and current educational practices. The project plan included the implementation of a qualitative study that focused on the phenomenological approach that is primarily interested in describing the lived experiences of research participants. This research design included in-depth interviews using open-ended statements to gather data. There were two broad categories that emerged from this study with sub-categories that included teaching methods, faculty/student relationships, test taking skills, grading system, study sessions, encouragement from faculty, and class organization