REDUCING SYSTEM BIAS AND SPECIFICATION ERROR IN MICRO-IMPLAN

Community/Rural/Urban Development,

Spray automated balancing of rotors: Methods and materials

The work described consists of two parts. In the first part, a survey is performed to assess the state of the art in rotor balancing technology as it applies to Army gas turbine engines and associated power transmission hardware. The second part evaluates thermal spray processes for balancing weight addition in an automated balancing procedure. The industry survey reveals that: (1) computerized balancing equipment is valuable to reduce errors, improve balance quality, and provide documentation; (2) slow-speed balancing is used exclusively, with no forseeable need for production high-speed balancing; (3) automated procedures are desired; and (4) thermal spray balancing is viewed with cautious optimism whereas laser balancing is viewed with concern for flight propulsion hardware. The FARE method (Fuel/Air Repetitive Explosion) was selected for experimental evaluation of bond strength and fatigue strength. Material combinations tested were tungsten carbide on stainless steel (17-4), Inconel 718 on Inconel 718, and Triballoy 800 on Inconel 718. Bond strengths were entirely adequate for use in balancing. Material combinations have been identified for use in hot and cold sections of an engine, with fatigue strengths equivalent to those for hand-ground materials

A Biosystematic Study of Silphium Integrifolium Michaux (Compositae)

Author Institution: Biology Department, State University of New York, College at Oneonta, Oneonta, New York 13820, and Biology Department, Bowling Green State University, Bowling Green, Ohio 43403Cytological and chromatographic data indicate that Silphium integrifolium Michx. is a rather homogeneous group of plants. Cytological study shows good pairing during meiosis in interspecific and intraspecific hybrids. Two-dimensional paper chromatography indicates that the varieties of S. integrifolium are more similar to each other than they are to two related species, S. asperrimum and S. speciosum. The varieties of S. integrifolium are chromatographically homogeneous

WATER USE COMPONENTS OF A REGIONAL ACCOUNTS AND SIMULATION SYSTEM

Resource /Energy Economics and Policy,

Evaluation of alternative market organizations in a simulated livestock-meat economy

The economic effects of alternative forms of market organization can be studied by direct observation or by experimenting with a simulated economy. The experimental approach in the study of market behavior is a relatively new but important technique for the analysis of many policy issues in American agriculture. Experimenting on a simulated system is not an analytical approach confined to academic issues; it has its counterpart, for example, in the engineering fields. Major engineering installations often are based on studies involving the use of models in simulated situations; the experimental results provide a basis for more accurately anticipating the actual performance of a dam, a bridge or a vehicle under different conditions. Similarly, simulation in economic research involves model building and manipulation that makes possible. the telescoping of years of actual experience into a matter of minutes and a few dollars worth of computer time