نتایج جستجو برای: cross section area
تعداد نتایج: 1150426 فیلتر نتایج به سال:
This paper reports estimates of the UK “college premium” for young graduates across successive cohorts from large cross section datasets for the UK pooled from 1994 to 2006 a period when the higher education participation rate increased dramatically. This implies that graduate supply considerably outstripped demand which ought to imply a fall in the premium. We find no significant fall for men ...
Top quark pair production cross section and properties of the top quark in p ¯ p collisions at √ s = 1.96 TeV An overview over measurements of top quark pair production in p ¯ p collisions at a center-of-mass energy of √ s = 1.96 TeV is given. Emphasis is given to measurements of the t ¯ t cross section in lepton+jets and dilepton final states with up to 5.4 fb −1 of integrated luminosity. Exam...
Using data collected during the 1992-1993 collider run at Fermilab, CDF has made measurements of correlated b quark cross section where one b is detected from the lepton from semileptonic decay and the second b is detected with secondary vertex techniques. We report on measurements of the cross section as a function of the momentum of the second b and as a function of the azimuthal separation o...
In order to facilitate the comparison of Riemannian homogeneous spaces of compact Lie groups with noncommutative geometries (“quantizations”) that approximate them, we develop here the basic facts concerning equivariant vector bundles and Dirac operators over them in a way that uses only global constructions and arguments. Our approach is quite algebraic, using primarily the modules of cross-se...
A study has been performed of the reaction p̄p→4K using in-flight antiprotons from 1.1 to 2.0 GeV/c incident momentum interacting with a hydrogen jet target. The reaction is dominated by the production of a pair of f mesons. The p̄p→ff cross section rises sharply above threshold and then falls continuously as a function of increasing antiproton momentum. The overall magnitude of the cross section...
Engel structures on M×S and M×I are studied in this paper, where M is a 3–dimensional manifold. We suppose that these structures have characteristic line fields parallel to the fibres, S or I . It is proved that they are characterized by contact structures on the cross section M , the twisting numbers, and Legendrian foliations on both ends M × ∂I in the case of M × I . AMS Classification 57R25...
This article studies the influence of risk on farms’ technical efficiency levels. The analysis extends the order-m efficiency scores approach proposed by Daraio and Simar (2005) to the state-contingent framework. The empirical application focuses on cross section data of Catalan specialised crop farms from the year 2011. Results suggest that accounting for production risks increases the technic...
in this paper, analysis of fluid flow and heat transfer over the bank of tubes is considered. k-ω sst model is applied for simulation of turbulent flow. in this paper, the improvement of efficiency of a bundle of circular tubes by changing the shape of the cross section of one row of the pipes to the elliptical cross section as an innovative plan is considered. as know, friction factor in turbu...
the purpose of this study is to survey cross section changes of the animal brain samples during the tension and compression tests and comparison of the experimental results for three animals: bovine, sheep, and rabbit. a linear elastic theory with considering the necking in tension and barreling in compression has been considered for brain tissue. bridgman method for tension and cross section u...
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