Exclusive electroproduction of π + mesons was studied by scattering 27.6 GeV positrons or electrons off a gaseous hydrogen target. The spin-averaged cross section and the single-spin azimuthal asymmetry with respect to transverse target polarisation were measured as a function of the Man-delstam variable t, the Bjorken scaling variable x B , and the virtuality Q 2 of the exchanged photon. The r...

in this paper, free vibration of an Euler-Bernoulli beam with variable cross-section resting on elastic foundation and under axial tensile force is considered. Beam’s constant height and exponentially varying width yields variable cross-section. The problem is handled for three different boundary conditions: clamped-clamped, simply supported-simply supported and clamp-free beams. First, the equ...

The web crossed truss boom is one of the commonly used structures crawler cranes. However, existing calculations fail to consider limiting effect members' bending resistance on chord members, and cannot give full play load-bearing capacity structure. This paper takes top section Crawler crane as research object. single-span theoretical model established according Timoshenko's elastic stability ...

Using quantile regression and a rich cross section data set for German manufacturing plants this paper documents that the impact of plant characteristics on export activities varies along the conditional size distribution of the export/sales ratio. For example, firm size is statistically significant at a conventional level for the 0.25 quantile only; branch plant status matters at the upper tai...

methyl tertiary butyl ether (mtbe) is known as a promising substitute for tetra ethyl lead (tel) in order to increase the octane number of gasoline. mtbe process, as many other processes, has two distinguished section, namely reaction section and separation section. in this paper we focus only on synthesis and optimization of separation section of this process. in order to achieve this objectiv...

The purpose of this paper is to give a cell decomposition for p-adic fields, uniform in p. This generalizes a cell decomposition for fixed p, proved by Denef [7], [9]. We also give some applications of our cell decomposition. A first implication is a uniform quantifier elimination for p-adic fields. Beiair [2], Delon [6] and Weispfenning [16] obtained quantifier elimination in other languages, ...

Scattering of arbitrarily polarized electromagnetic plane waves by a dielectric cylinder buried in an unbounded dielectric space and enclosing an array of parallel doubly layered (pipeline-type) dielectric circular cylinders is studied, in case of oblique incidence. The objective of this work is to present an exercise suitable for an advanced course on engineering electromagnetics. Using the bo...