Mössbauer effect measurements on a AuFe spin glass

Zero field Mössbauer measurements have been carried out between 1.9 and 30 K and at room temperature on a $\text{Au}$-3 at% Fe sample. There is a quite well defined change of regime at about 19.5 K, well above the cusp temperature of this sample which was measured to be 16.4 K. In the temperature region below 19.5 K the spectra can best be described in terms of a static, inhomogeneously broadened field distribution, and at higher temperatures the spectra are compatible with relaxation broadening. Estimated relaxation rates in this regime are similar to those obtained by other techniques.     

Structure and properties of semicrystalline polymers via high-frequency acoustic and x-ray measurements. I. Ferroelectric P(VDF/TrFE) copolymer

Acoustic, opto-acoustic, and x-ray investigations have been performed in order to study the influence of irradiation, electrical poling, and mechanical orientation on the morphology of ferroelectric random copolymers of vinylidene fluoride and trifluorethylene {P[VDF/TrFE] (70/30)}. The influences of these different treatments on the molecular orientation distribution of the amorphous and crystalline phases are discussed, as well as their influences on the crystallinity of the material. The elastic stiffness and the related viscosity tensors of P[VDF/TrFE] (70/30), the elastic stiffness modulus of the amorphous matrix, and the hierarchy of stiffness constants of the crystalline state have been determined. © 1993 John Wiley & Sons, Inc.     

Über sterische Behinderungen bei alkylsubstituierten Cinchoninsäuren

Ohne Zusammenfassung     

The Baum-Connes Conjecture via Localization of Categories

We redefine the Baum-Connes assembly map using simplicial approximation in the equivariant Kasparov category. This interpretation is ideal for studying functorial properties and gives analogues of the Baum-Connes assembly map for all equivariant homology theories.     

Elastic electron deuteron scattering on a tensor polarized solid ND3 target

Elastic electron deuteron scattering has been measured at the Bonn 2.5 GeV electron-synchrotron using a tensor polarized ND₃ target. The scattered electrons and deuterons were detected in coincidence by two magnetic spectrometers. Data were taken at an average value of four momentum transfer ofQ ²=0.495 (GeV/c)² in order to separate the electric monopole and quadrupole form factors of the deuteron. To have a sufficient control of systematic effects, both polarized and unpolarized cross sections were measured with an identical experimental set up. In the ratioR _EXP=dσ_pol/dσ_unp systematic effects are expected to cancel. This ratioR _EXP is related to the theoretical polarized cross section d dσ _T where the spin quantization axis for the deuterons is orientated in the ed-scattering plane, perpendicular to the virtual photon direction. Our final result for the corresponding recoil tensor polarization ist ₂₀=?2.01±1.13.     

A measurement of differential cross-sections and nucleon structure functions in charged-current neutrino interactions on iron

A high-statistics measurement of the differential cross-sections for neutrino-iron scattering in the wide-band neutrino beam at the CERN SPS is presented. Nucleon structure functions are extracted and theirQ ² evolution is compared with the predictions of quantum chromodynamics.     

索道输送系统钢绳及支撑组合系统动力学特征模型

给出一类索道输送系统钢绳与中间支撑机构组合的动力学模型。模型用于计算索道系统钢绳与中间支撑滑轮组机构工作工况的动力学特征值。发展了分析此特殊耦合动力学问题的方法。计算的特征值与实测是相符。     

Nuclear stopping power in αα anddd collisions

Inelasticαα anddd collisions were studied at a centre-of-mass energy √S _NN=31.2 GeV per nucleon-nucleon collision, using the Split-Field Magnet (SFM) detector at the CERN ISR. In this paper we show the inclusive and semi-inclusive rapidity distributions of protons, compare them with predictions of the Lund model, and calculate the average rapidity loss for participant protons. From the negative particles we calculate the inelasticity of the interaction, the average energy per particle, and the degree of isotropy of the produced hadrons.