Performance of wind turbines in a turbulent atmosphere

The effect of atmospheric turbulence on the power fluctuations of large wind turbines was studied. The significance of spatial non-uniformities of the wind is emphasized. The turbulent wind with correlation in time and space is simulated on the computer by Shinozukas method. The wind turbulence is modelled according to the Davenport spectrum with an exponential spatial correlation function. The rotor aerodynamics is modelled by simple blade element theory. Comparison of the spectrum of power output signal between 1-D and 3-D turbulence, shows the significant power fluctuations centered around the blade passage frequency

The Southern Vilnius Photometric System. IV. The E Regions Standard Stars

This paper is the fourth in a series on the extension of the Vilnius photometric system to the southern hemisphere. Observations were made of 60 stars in the Harvard Standard E regions to increase a set of standard stars.Comment: 6 pages, TeX, requires 2 macros (baltic2.tex, baltic4.tex) included no figures, to be published in Baltic Astronomy, Vol 6, pp1-6 (1997

Objectives of permanent lunar bases

Permanent manned lunar surface and orbiting base

Hybrid A/D converter for 200 deg C operation

A 12 bit A/D converter was designed and developed which will operate at 200 C with .05 linearity, 1/accuracy, 350 WSec conversion time, and only 455 mW power consumption. This product also necessitated the development of a unique three metal system in which aluminum wire bonding is done utilizing aluminum bonding pads, gold wire bonding to all gold areas, and employment of a nickel interface between gold and aluminum connections. This system totally eliminates the formation of a intermetallics at the bonding interface which can lead to bond failure. This product represents an advancement in electronics as it proved the operation of integrated circuits at high temperature, as well as providing information about both the electrical and mechanical reliability of hybrid circuits at 200 C

Saturn orbiter mission study

A preliminary analysis of the important aspects of missions orbiting the planet Saturn is provided. Orbital missions to Saturn is given serious consideration for the 1980's, or after flybys by Pioneer 10/G and Mariner Jupiter-Saturn 1977. An attempt is made to characterize Saturn orbiters in detail so that comparisons with Jupiter missions can be made. The scientific objectives of Saturn exploration are grouped under four topics: (1) the atmosphere, (2) the magnetosphere, (3) the rings, and (4) the satellites

How does ownership structure and manager wealth influence risk? : a look at ownership structure, manager wealth, and risk in commercial banks

Bank managers, stockholders, and directors must work closely together in deciding what risks their bank will assume and how to control the bank's overall risk exposure. Each decision-maker will have to understand the risk preferences of others in order to make mutually acceptable decisions and develop policies that reflect all of their concerns. To the extent that weak risk control is tied to management and ownership structure, bank examiners must also understand the basic components of a sound management and ownership structure if the examiner is to suggest corrective steps for a problem institution. ; This study looks at a sample of Tenth Federal Reserve District banks to investigate the relationship between bank risk, ownership of the bank by managers, and the degree to which managers and owners have their wealth concentrated in their bank stockholdings. Data for 270 randomly selected banks reveal that ownership and wealth diversification of bank owners and managers do influence bank risk. These effects extend not only to the overall risk of the bank, but are also reflected uniquely in asset quality measures, bank leverage, and other parts of a bank's risk exposure. ; Major findings highlight connections between bank risk, ownership structure, and manager wealth. Banks are less risky when bank managers have a higher concentration of wealth in their bank and, thus, have more to lose from taking on additional risk. Possibly seeking to avoid large loan losses that could threaten their employment, hired managers typically operate their banks with lower credit risk than banks with owner managers. Using capital as a buffer against risk, owner-manager banks tend to have higher capitalization than banks with hired managers. Stock ownership by hired managers provides incentives to operate their bank more in line with the risk preferences of owners. Finally, a hired-manager bank will be less risky when a major owner monitoring the bank has much of his or her wealth concentrated in the bank's stock. ; Thus, ownership structure and concentration of wealth in bank equity have a significant influence on bank risk. Understanding how risk preferences depend on ownership and wealth diversification can be valuable information to managers and owners as they grapple with the level and type of risk to take in their banks.Risk ; Banking structure ; Federal Reserve District, 10th

Age constraints on the evolution of the Quetico belt, Superior Province, Ontario

Much attention has been focused on the nature of Archean tectonic processes and the extent to which they were different from modern rigid-plate tectonics. The Archean Superior Province has linear metavolcanic and metasediment-dominated subprovinces of similar scale to cenozoic island arc-trench systems of the western Pacific, suggesting an origin by accreting arcs. Models of the evolution of metavolcanic belts in parts of the Superior Province suggest an arc setting but the tectonic environment and evolution of the intervening metasedimentary belts are poorly understood. In addition to explaining the setting giving rise to a linear sedimentary basin, models must account for subsequent shortening and high-temperature, low-pressure metamorphism. Correlation of rock units and events in adjacent metavolcanic and metasedimentary belts is a first step toward understanding large-scale crustal interactions. To this end, zircon geochronology has been applied to metavolcanic belts of the western Superior Province; new age data for the Quetico metasedimentary belt is reported, permitting correlation with the adjacent Wabigoon and Wawa metavolcanic subprovinces

Properties of nonaqueous electrolytes First quarterly report, 20 Jun. - 19 Sep. 1966

Solvent purification and water content determined by gas chromatography for nonaqueous electrolyte