947 research outputs found
Structural modeling of aircraft tires
A theoretical and experimental investigation of the feasibility of determining the mechanical properties of aircraft tires from small-scale model tires was accomplished. The theoretical results indicate that the macroscopic static and dynamic mechanical properties of aircraft tires can be accurately determined from the scale model tires although the microscopic and thermal properties of aircraft tires can not. The experimental investigation was conducted on a scale model of a 40 x 12, 14 ply rated, type 7 aircraft tire with a scaling factor of 8.65. The experimental results indicate that the scale model tire exhibited the same static mechanical properties as the prototype tire when compared on a dimensionless basis. The structural modeling concept discussed in this report is believed to be exact for mechanical properties of aircraft tires under static, rolling, and transient conditions
Mars mission solar array Semiannual progress report, period ending 31 Dec. 1969
Design and testing of beryllium-structure solar panel for Mars missio
Assertion, Uniqueness and Epistemic Hypocrisy
Pascal Engel (2008) has insisted that a number of notable strategies for rejecting the knowledge norm of assertion are put forward on the basis of the wrong kinds of reasons. A central aim of this paper will be to establish the contrast point: I argue that one very familiar strategy for defending the knowledge norm of assertionâviz., that it is claimed to do better in various respects than its competitors (e.g. the justification and the truth norms)â relies on a presupposition that is shown to be ultimately under motivated. That presupposition is the uniqueness thesisâthat there is a unique epistemic rule for assertion, and that such a rule
will govern assertions uniformly. In particular, the strategy I shall take here will be to challenge the sufficiency leg of the knowledge norm in a way that at the same time counts against Williamsonâs (2000) own rationale for the uniqueness thesis. However, rather than to challenge the sufficiency leg of the knowledge norm via the familiar style of âexpert opinionâ and, more generally, âsecond-hand knowledgeâ cases (e.g. Lackey (2008)), a strategy that has recently been called into question by Benton (2014), Iâll instead advance a very different line of argument against the sufficiency thesis, one which turns on a phenomenon I call epistemic hypocrisy
Level-1 Regional Calorimeter Trigger System for CMS
The Compact Muon Solenoid (CMS) calorimeter regional trigger system is
designed to detect signatures of isolated and non-isolated electrons/photons,
jets, ?-leptons, and missing and total transverse energy using a deadtimeless
pipelined architecture. This system contains 18 crates of custom-built
electronics. The pre-production prototype backplane, boards, links and
Application-Specific Integrated Circuits (ASICs) have been built and their
performance is characterized.Comment: Talk from the 2003 Computing in High Energy and Nuclear Physics
(CHEP03), La Jolla, Ca, USA, March 2003, 6 pages, PDF. PSN THHT00
Comparing life expectancy of three deer species between captive and wild populations
Life in zoological gardens provides a number of benefits to captive animals, resulting in an artificial reduction of the âstruggle for lifeâ compared to their free-ranging counterparts. These advantages should result in a higher chance of surviving from one year to the next, and thus in longer average life expectancies for captive animals, given that the biological requirements of the species are adequately met. Here, we compare the life expectancy of captive and free-ranging populations of three deer species (reindeer Rangifer tarandus, red deer Cervus elaphus, and roe deer Capreolus capreolus). Whereas captive reindeer and red deer had life expectancies equal to or longer than free-ranging individuals, the life expectancy of captive roe deer was shorter than that of free-ranging animals. These results support the impression that roe deer are difficult to keep in zoos, whereas reindeer and red deer perform well under human care. We suggest that the mean life expectancy of captive populations relative to that of corresponding free-ranging populations is a reliable indicator to evaluate the husbandry success of a species in captivity
Reasons, Coherence, and Group Rationality
Philosophy and Phenomenological Research, EarlyView
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