113,106 research outputs found
Sir John Adams: his legacy to the world of particle accelerators
John Adams acquired an unrivalled reputation for his leading part in
designing and constructing the Proton Synchrotron (PS) in CERN's early days. In
1968, and after several years heading a fusion laboratory in the UK, he came
back to Geneva to pilot the Super Proton Synchrotron (SPS) project to approval
and then to direct its construction. By the time of his early death in 1984 he
had built the two flagship proton accelerators at CERN and, during the second
of his terms as Director-General, he laid the groundwork for the
proton-antiproton collider which led to the discovery of the intermediate
vector boson. How did someone without any formal academic qualification achieve
this? What was the magic behind his leadership? The speaker, who worked many
years alongside him, will discuss these questions and speculate on how Sir John
Adams might have viewed today's CERN.Comment: 29 pages, John Adams Memorial Lecture 2009, published with
high-resolution figures as CERN Yellow Report
http://cdsweb.cern.ch/record/133152
Static and dynamic helicopter airframe analysis with NASTRAN
The use of NASTRAN at Bell Helicopter Company for structural static and dynamic analysis of a helicopter airframe is described. Analysis of airframe internal loads, main rotor isolation systems, and airframe vibration is discussed. The use of each rigid format for these types of analysis is summarized. Suggested improvements to NASTRAN to increase its effectiveness in performing helicopter airframe analysis are given
High-temperature capacitive strain measurement system
Capacitive strain gage and signal conditioning system measures stress-induced strain and cancels thermal expansion strain at temperatures to 1,500 F (815 C). Gage does not significantly restrain or reinforce specimen
Irreducible completely pointed modules of quantum groups of type
We give a classification of all irreducible completely pointed
modules over a characteristic zero field in which
is not a root of unity. This generalizes the classification result of
Benkart, Britten and Lemire in the non quantum case. We also show that any
infinite-dimensional irreducible completely pointed
can be obtained from some irreducible completely pointed module over the
quantized Weyl algebra .Comment: 25 page
Ontogeny of the Tibial Spur in \u3ci\u3eMegamelus Davisi\u3c/i\u3e (Homoptera: Delphacidae) and its Bearing on Delphacid Classification
The forms of the nymphal tibial spur in Megamelus davisi Van Duzee, and their relation to Muir\u27s classification of delphacid subfamilies and tribes, are discussed
Grasshoppers Feeding on Red Pine Trees in Michigan (Orthoptera: Acrididae)
Very few North American grasshoppers are true feeders on conifers. The several species of the punctulatus species-group of the genus Melanoplus, as summarized and revised by Rehn (1946), have been reported as occurring on pine, juniper, and cedar, but few reports of actual feeding on conifers have appeared in the literature. Because of this paucity of information regarding the use of conifers as food for grasshoppers, we summarize here observations of several kinds of grasshoppers feeding on red pine (Pinus resinosa Aiton) in 1966 in Michigan
Notes on the Biology of \u3ci\u3eNersia Florens\u3c/i\u3e (Homoptera: Fulgoroidea: Dictyopharidae) with Descriptions of Eggs, and First, Second, and Fifth Instars
Information on food plants and laboratory rearing of Nersia florens Stal is provided, and the eggs and Ist, 2nd, and 5th instars are described
Development of thermal control methods for specialized components and scientific instruments at very low temperatures (follow-on)
Many payloads currently proposed to be flown by the space shuttle system require long-duration cooling in the 3 to 200 K temperature range. Common requirements also exist for certain DOD payloads. Parametric design and optimization studies are reported for multistage and diode heat pipe radiator systems designed to operate in this temperature range. Also optimized are ground test systems for two long-life passive thermal control concepts operating under specified space environmental conditions. The ground test systems evaluated are ultimately intended to evolve into flight test qualification prototypes for early shuttle flights
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