Experimental study of the deformed state of metal structures of load trolleys of overhead cranes with a multipurpose layout drawing

Deformations of the supporting metal structures of machines for various purposes have a significant impact on the performance of the equipment installed on them. Insufficient rigidity of a metal structure can cause jamming and failure of drive elements and working bodies of material handling, construction and road machines, the operation of which is associated with the impact of high static and dynamic loads. Therefore, when designing new structural schemes of load-bearing metal structures, special attention must be paid to the issue of ensuring the necessary rigidity. The presented work contains the results of an experimental assessment of the deformed state of physical models of the metal structures of load trolleys of overhead cranes, made on the basis of a multipurpose layout drawing using various types of connections of bearing elements. The article reflects information about the methodology of experimental research, describes the features of the physical models of metal structures used in the course of the experiment. The data on the vertical displacements of the control points of metal structures when using various loading schemes are given. An assessment was made of the influence of the type of applied connections of load-bearing elements on the features of the resulting deformed state of the metal structure. A comparative analysis of experimental data and calculated values of vertical displacements of points of metal structures obtained as a result of computer simulation of the formed state using various finite element models is performed

Features of Auger-emission in channeling

Shown in this paper is the influence of channeling effect on formation of the signal for low- and high-energy Auger-electrons observed in monocrystalline silicon. It has been ascertained the anisotropic (wave-like) character of the yield value for lowenergy Auger-electrons in silicon, when changing the angle of acting initial radiation during sample rotation

Mathematical models of structural and parametric synthesis of load trolley metalware of bridge cranes on basis of multipurpose layout drawing

The mathematical models of the structural and parametric synthesis of the load trolley metalware of bridge cranes on the basis of the multipurpose layout drawing are suggested. The models are based on the matrix representation of the metalware segment structures. The article considers the options for implementation of the structural matrixes of the elements and parameter matrixes when performing design calculations as a part of the developed mathematical models. The purpose of the calculations is to confirm the bearing capacity of the metalware, taking into account the requirements of the regulations and specifications. The basic structures of the mathematical models of the structural and parametric synthesis of the metalware are formed, using the structural matrixes of the separate elements and matrixes of the element interconnection. The general structure of the developed mathematical models is shown, and the description of the functionality of the separate matrix groups of the different calculation modules is given

Influence of Shear Deformation on Carbon Onions Stability under High Pressure

The influence of shear deformation on carbon onions stability under high pressure up to 45 GPa was investigated in a Shear Diamond Anvil Cell (SDAC) by the Raman spectroscopy and the Transmission Electron Microscopy (TEM). At shear less then 40 degrees the carbon onions are stable up to 30 GPa. Biger shear deformation leads to increasing of size and destruction of the onions and to formation of sp3 C-C bonds. At pressure exceeded 45 GPa shear deformation leads to diamond-like carbon (DLC) formation. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3501

Spin asymmetry A_1^d and the spin-dependent structure function g_1^d of the deuteron at low values of x and Q^2

We present a precise measurement of the deuteron longitudinal spin asymmetry A_1^d and of the deuteron spin-dependent structure function g_1^d at Q^2 < 1 GeV^2 and 4*10^-5 < x < 2.5*10^-2 based on the data collected by the COMPASS experiment at CERN during the years 2002 and 2003. The statistical precision is tenfold better than that of the previous measurement in this region. The measured A_1^d and g_1^d are found to be consistent with zero in the whole range of x.Comment: 17 pages, 10 figure

Transverse spin effects in hadron-pair production from semi-inclusive deep inelastic scattering

First measurements of azimuthal asymmetries in hadron-pair production in deep-inelastic scattering of muons on transversely polarised ^6LiD (deuteron) and NH_3 (proton) targets are presented. The data were taken in the years 2002-2004 and 2007 with the COMPASS spectrometer using a muon beam of 160 GeV/c at the CERN SPS. The asymmetries provide access to the transversity distribution functions, without involving the Collins effect as in single hadron production. The sizeable asymmetries measured on the NH_ target indicate non-vanishing u-quark transversity and two-hadron interference fragmentation functions. The small asymmetries measured on the ^6LiD target can be interpreted as indication for a cancellation of u- and d-quark transversities.Comment: 13 pages, 4 figures, updated to the published versio

Gluon polarization in the nucleon from quasi-real photoproduction of high-pT hadron pairs

We present a determination of the gluon polarization Delta G/G in the nucleon, based on the helicity asymmetry of quasi-real photoproduction events, Q^2<1(GeV/c)^2, with a pair of large transverse-momentum hadrons in the final state. The data were obtained by the COMPASS experiment at CERN using a 160 GeV polarized muon beam scattered on a polarized 6-LiD target. The helicity asymmetry for the selected events is = 0.002 +- 0.019(stat.) +- 0.003(syst.). From this value, we obtain in a leading-order QCD analysis Delta G/G=0.024 +- 0.089(stat.) +- 0.057(syst.) at x_g = 0.095 and mu^2 =~ 3 (GeV}/c)^2.Comment: 10 pages, 3 figure

The Spin-dependent Structure Function of the Proton g_1^p and a Test of the Bjorken Sum Rule

The inclusive double-spin asymmetry, A_1^p, has been measured at COMPASS in deepinelastic polarised muon scattering off a large polarised NH3 target. The data, collected in the year 2007, cover the range Q2 > 1 (GeV/c)^2, 0.004 < x < 0.7 and improve the statistical precision of g_1^p(x) by a factor of two in the region x < 0.02. The new proton asymmetries are combined with those previously published for the deuteron to extract the non-singlet spin-dependent structure function g_1^NS(x,Q2). The isovector quark density, Delta_q_3(x,Q2), is evaluated from a NLO QCD fit of g_1^NS. The first moment of Delta_q3 is in good agreement with the value predicted by the Bjorken sum rule and corresponds to a ratio of the axial and vector coupling constants g_A/g_V = 1.28+-0.07(stat)+-0.10(syst).Comment: 12 pages, 5 figure