65,089 research outputs found
Illumination system including a virtual light source Patent
Illumination system design for use as sunlight simulator in space environment simulators with multiple light sources reflected to single virtual sourc
Development of payload subsystem, Primate mission, Biosatellite program
Design development discussion of primate support system for Biosatellit
Seasonal Occurrence of Pine Root Collar Weevil, \u3ci\u3eHylobius Radicis\u3c/i\u3e (Coleoptera: Curculionidae), in Red Pine Stands Undergoing Decline
A trapping scheme was devised for sampling the pine root collar weevil, Hylobius radicis, in mature red pine plantations in Wisconsin. Adult weevils were trapped throughout the 1986 field season, and the method appears sensitive enough to discern temporal and spatial trends. The number of weevils caught was higher in stands symptomatic of the general condition currently labelled Red Pine Decline and Mortality. In some stands there was a strong tendency for trap catches to be particularly high near certain trees. Seasonal trends and sex ratios were compared with published reports of H. radicis activity in Michigan
Within-Generation Morality of the Jack Pine Tip Beetle, \u3ci\u3eConophthorus Banksianae\u3c/i\u3e McPherson, in Michigan
(excerpt)
The jack pine tip beetle (Conophthorus banksianae McPherson) is a shoot-infesting scolytid hat primarily attacks jack pine (Pinus banksiana Lamb.) in Michigan. The insect was previously thought to be a variant of C. resinosae Hopkins, which attacks cones and shoot tips of red pine. McPherson described C. banksianae as a new species, following life cycle and behavioral studies (McPherson, Wilson, and Stehr 1970; McPherson, Stehr, and Wilson 1970). Separating them by morphological features has been unsuccessful (Herdy 1963)
Automatic water inventory, collecting, and dispensing unit
Two cylindrical tanks with piston bladders and associated components for automatic filling and emptying use liquid inventory readout devices in control of water flow. Unit provides for adaptive water collection, storage, and dispensation in weightlessness environment
Primitive axial algebras of Jordan type
An axial algebra over the field is a commutative algebra
generated by idempotents whose adjoint action has multiplicity-free minimal
polynomial. For semisimple associative algebras this leads to sums of copies of
. Here we consider the first nonassociative case, where adjoint
minimal polynomials divide for fixed . Jordan
algebras arise when , but our motivating examples are certain
Griess algebras of vertex operator algebras and the related Majorana algebras.
We study a class of algebras, including these, for which axial automorphisms
like those defined by Miyamoto exist, and there classify the -generated
examples. For this implies that the Miyamoto
involutions are -transpositions, leading to a classification.Comment: 41 pages; comments welcom
Apparatus for measuring electric field strength on the surface of a model vehicle Patent
Space environment simulation system for measuring spacecraft electric field strength in plasma sheat
Dynamic Characteristics of Woodframe Buildings
The dynamic properties of wood shearwall buildings were evaluated, such as modal frequencies, damping and mode shapes of the structures. Through analysis of recorded earthquake response and by forced vibration testing, a database of periods and damping ratios of woodframe buildings was developed. Modal identification was performed on strong-motion records obtained from five buildings, and forced vibration tests were performed on a two-story house and a three-story apartment building, among others. A regression analysis is performed on the database to obtain a period formula specific for woodframe buildings. It should be noted that all test results, including the seismic data, are at small drift ratios (less than 0.1%), and the periods would be significantly longer for stronger shaking of these structures. Despite these low amplitudes, the equivalent viscous dampings for the fundamental modes were usually more than 10% of critical during earthquake shaking
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