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1.
William A. Lampe 《Periodica Mathematica Hungarica》1996,32(1-2):65-75
We survey results concerning the representations of lattices as lattices of congruences and as lattices of equational theories. Recent results and open problems will be mentioned.To László Fuchs on the occasion of his 70th birthday 相似文献
2.
The relation between the light-cone expansion and the QCD improved parton model formalism for polarized deep inelastic muon-production is discussed in detail. The regulator dependence of the relevant quantities is explicity studied at the two-loop level for the first moment ofg 1 P . It is shown that the anomalous gluon component is well defined if the quark term is specified as a conserved quantity that does not evolve inQ 2. The behaviour of the first moment ofg 1 P at the threshold for heavy quark production is also discussed. 相似文献
3.
Basic Aluminium Salts and their Solutions. XI. 27Al-NMR Studies Comparing the Mineral Zunyite and Basic Aluminium Salts of Tridecameric Al-oxo-hydroxo-aquo-Cations Solid-state high resolution 27Al NMR studies of basic aluminum sulphate and the mineral zunyite, both containing tridecameric Al-oxo-hydroxo groups, show different 27Al spectra. While for zunyite both AlO6 octahedra (0 ppm) and the central AlO4 tetrahedron (69 ppm) are observed in the spectrum, in the case of the basic aluminum sulphate only the tetrahedrally coordinated Al (59 ppm) is detected by NMR. This behaviour is explained by structural data, which indicate stronger distortions of the AlO6 octahedra in the case of the basic aluminum sulphate. The increased shielding of the fourcoordinated Al of the basic sulphate is attributed to an increased ionic character of the Al? O bond in this compound. 相似文献
4.
The leading heavy-top two-loop corrections to theZb \(\bar b\) vertex are determined from a direct evaluation of the corresponding Feynman diagrams in the largem t limit. The leading one-loop top-mass effect is enhanced by \([{{1 + G_\mu m_t^2 ({{9 - \pi ^2 } \mathord{\left/ {\vphantom {{9 - \pi ^2 } 3}} \right. \kern-0em} 3})} \mathord{\left/ {\vphantom {{1 + G_\mu m_t^2 ({{9 - \pi ^2 } \mathord{\left/ {\vphantom {{9 - \pi ^2 } 3}} \right. \kern-0em} 3})} {(8\pi ^2 \sqrt 2 )}}} \right. \kern-0em} {(8\pi ^2 \sqrt 2 )}}]\) . Our calculation confirms a recent result of Barbieri et al.. 相似文献
5.
We calculate the cross section fore
+
e
–3 jets for longitudinally polarized virtual photons up to order
s
2
in the quark-gluon coupling.Dedicated to the memory of Kurt Symanzik 相似文献
6.
High-resolution 29Si NMR spectra of zunyite Si5Al13O20 (OH,F)18Cl have been studied by magic-angle sample spinning in combination with high-power proton decouplina and polarization transfer. The isotropic 29Si chemical shift depends mainly on the number of Si-O-Si bridges and the bond angles in these bridges connecting the different SiO4 tetrahedra. 相似文献
7.
Tandem mass spectrometric studies show that SiH+5 is formed in bimolecular reactions of SiH4 and NH+2, C2H+3, C2H+6 and C3H+8 ions. The dependence of the reaction cross sections on ion energy indicates the formation of SiH+5 from NH+2, C2H+3, and C2H+6 to be exothermic reactions, while formation from C3H+8 is endothermic. Using known thermochemical data, these facts permit the assignment of 150 and 156 kcal/mole to the lower and upper limits of the proton affinity of monosilane. 相似文献
8.
We discuss the scale dependence of
s
in connection with jet multiplicities on theZ pole in the framework of perturbative QCD. Several scale defining procedures are applied to jet fractions and compared to recent measurements at LEP.Dedicated to Prof. Dr. H.J. Mang on the occasion of his 60th birthday 相似文献
9.
B. Lampe 《Fortschritte der Physik》1992,40(4):329-392
We calculate one-loop QCD corrections to the production cross-section for heavy quarks in protonantiproton collisions. We are interested in the behaviour of the cross-section at high transverse energies. At high PT the quark mass should become an irrelevant parameter. Therefore we work in the framework of massless QCD and absorb all mass singularities in a redefinition of the parton densities and fragmentation functions. Numerical results of the cross-section at √S = 0.63, 1.8 and 10 TeV are presented and the dependence of these results on the factorization scheme is examined. 相似文献
10.
Michael Reinhardt Andreas Schnhals Dietmar Pfeifer Karl Pfeiffer Irene V. Lampe Hans-Joachim Lorkowski 《先进技术聚合物》1996,7(10):791-796
Dielectric relaxation spectroscopy in the frequency range from 10−2 Hz to 106 Hz and electron spin resonance (ESR) experiments are employed to study the dynamics in chemically and physically crosslinked networks. As examples for physically crosslinked networks ortho- and para-cresol novolacs were investigated. Dielectrically these materials show low-temperature β- and high-temperature α-relaxation. Both relaxation regions differ for both types of novolacs. This is also reflected by the ESR measurements and is discussed in terms of different hydrogen bonds found to be stronger in para-cresol novolac. For the chemically crosslinked poly(triallyl isocyanurate) only a β-peak is found by the dielectric measurements. Also in the ESR experiment the slow motion regime is characterized up to high temperatures. This means that the segmental motion is strongly suppressed by chemical crosslinking. Nevertheless the obtained change in the formal T50G value can be used to characterize the glass transition in highly crosslinked systems by the ESR method. 相似文献