Shockwaves in converging geometries

Plate impact experiments are a powerful tool in equation of state (EOS) development, but are inherently limited by the range of impact velocities accessible to the gun. In an effort to dramatically increase the range of pressures which can be studied with available impact velocities, a new experimental technique is being developed. The possibility of using a confined converging target to focus Shockwaves and produce a large amplitude pressure pulse is examined. When the planar shock resulting from impact enters the converging target the impedance mismatch at the boundary of the confinement produces reflected Mach waves and the subsequent wave interactions produce a diffraction cycle resulting in increases in the shock strength with each cycle. Since this configuration is limited to relatively low impedance targets, a second technique is proposed in which the target is two concentric cylinders designed such that the inner cylinder will have a lower shock velocity than the much larger shock velocity in the outer cylinder. The resulting dispersion in the wave front creates converging shocks, which will interact and eventually result in a steady Mach configuration with an increase in pressure in the Mach disk. Numerical simulations indicate a significant increase in pressure for both methods and show promise for the proposed concepts

A study of the relationship between graduate and undergraduate scholarship at the Indiana State Teachers College

Not Available.William G. BrownNot ListedNot ListedMaster of ArtsDepartment Not ListedCunningham Memorial library, Terre Haute, Indiana State University.isua-thesis-1934-brown.pdfMastersTitle from document title page. Document formatted into pages: contains 79p. : ill. Includes appendix

A MULTIVARIATE ANALYSIS OF FACTORS INFLUENCING FARM MACHINERY PURCHASE DECISIONS

This paper presents a model of the farm management process. The model suggests that certain socioeconomic characteristics of farm managers will influence their decision-making process. Several characteristics are hypothesized an tested using multivariate techniques (multivariate analysis of variance, range tests, and multiple comparisons). The analysis indicates that the soil zone, value of machinery inventory, operator's age, and operator's education influence the importance placed on each of 20 factors. On the basis of the analysis it was concluded that such a model of the farm management process can contribute to an understanding of farm management decisions. In addition, it was concluded that farm managers, farm machinery dealers, and extension agents had significantly different perceptions of the importance of these factors to farm managers. This latter conclusion suggests that more research related to the actual process of decision making is warranted.Farm Management,

Automatic identification of embedded network rows in large-scale optimization models

The solution of a contemporary large-scale linear, integer, or mixed-integer programming problem is often facilitated by the exploitation of intrinsic special structure in the model. This paper deals with the problem of identifying embedded pure network rows within the coefficient matrix of such models and presents two heuristic algorithms for identifying such structure. The problem of identifying the maximum-size embedded pure network is shown to be among the class of NP-hard problems; therefore, the polynomially bounded, efficient algorithms presented here do not guarantee network sets of maximum size. However, upper bounds on the size of the maximum network set are developed and used to evaluate the algorithms. Computational tests with large-scale, real-world models are presented.Office of Naval Research, Code 434, Arlington, VAApproved for public release; distribution is unlimited

Farm land and debt situation in Iowa, 1935

Corporate-owned land amounted on January 1, 1935, to 10.1 percent of the 34 million acres of farm land in Iowa. Insurance companies hold over half the corporate-owned land, with deposit banks the second largest holder. Centers of concentration are in the south-central, north-central and a small area in the western part of the state. The Iowa farm mortgage debt was reduced by $74,000,000 during 1934, and now totals$924,000,000, of which 40 percent is held by insurance companies, 26 percent by the Farm Credit Administration and 12 percent by banks The debt per acre was $63 at the close of 1934 as compared with$66 in 1933. Since 1933 there has been a reduction of 2 percent in farm land mortgaged. (Forty-three percent is now mortgaged.

Cutting Livestock Income Risks

The way you manage your farm - what you produce and how you produce it depends partly on your family goals. The outstanding goal of most farm families is to attain the greatest possible satisfactions of life

Economic instability and choices involving income and risk In livestock and poultry production

This study is an empirical one dealing particularly with adjustments to uncertainty. Its purposes are (1) to evaluate price factors contributing to uncertainty in livestock production, (2) to measure income variability for different enterprises and (3) to test different patterns of diversification as means of reducing income variability. To accomplish these ends, data were drawn from a reconstruction of income experience for 10 livestock and poultry enterprises over a period of 32 years. These budgets assumed average physical productivity and used Iowa annual prices. Price fluctuations are the factors of most importance in contributing to uncertainty in livestock production. Variation of total costs and gross income combine to cause high variability of net income and feed returns. The correlation between total cost and gross income also has some bearing on net income variability