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121.
V. V. Aivazyan I. V. Ajinenko Yu. A. Belokopytov H. Białkowska L. V. Bravina H. Böttcher F. Botterweck P. V. Chliapnikov F. Crijns A. De Roeck E. A. De Wolf K. Dziunikowska A. M. F. Endler Z. G. Garutchava N. G. Grigoryan T. van Hal T. Haupt D. Kisielewska W. Kittel F. Meijers A. B. Michałowska V. I. Nikolaenko K. Olkiewicz L. P. Petrovikh F. K. Rizatdinova V. M. Ronjin A. M. Rybin L. Scholten E. K. Shabalina L. N. Smirnova N. A. Sotnikova O. G. Tchikilev L. A. Tikhonova A. G. Tomaradze V. A. Uvarov R. Verbeure R. Wischnewski 《Zeitschrift fur Physik C Particles and Fields》1991,51(2):167-178
Two- and three-particle rapidity correlations are analyzed inK + p and π+ p-interactions at 250 GeV/c. The main contribution to the two- and three-particle correlation functions comes from mixing of events of different multiplicity. The (short range) two-particle correlation remaining after exclusion of mixing is significantly larger for (+?) than for the equal charge combinations, and is positive for a wider range in rapidity difference. FRITIOF and a 2-string DPM are excluded by our data. A quark-gluon (multi-)string model can describe our inclusive correlation function, but needs to be tuned on the short range part. The multiplicity mixing part increases much faster with increasing energy than the short range part. In the central region, our correlation is similar to that observed ine + e ? and μp collisions at similar energy. 相似文献
122.
123.
I. V. Ajinenko M. R. Atayan Yu. A. Belokopytov H. Boettcher F. Botterweck P. V. Chliapnikov F. Crijns A. de Roeck E. A. De Wolf K. Dziunikowska A. M. F. Endler A. Eskreys Z. C. Garutchava Yu. A. Golubkov N. G. Grigoryan P. van Hal T. Haupt W. Kittel B. B. Levchenko F. Meijers A. B. Michalowska V. I. Nikolaenko K. Olkiewicz R. P?ll?nen L. P. Petrovikh V. M. Ronjin R. Rosmalen R. Rosmalen A. M. Rybin H. M. T. Saarikko L. Scholten N. N. Sotnikova J. Stepaniak O. G. Tchikilev A. G. Tomaradze V. A. Uvarov F. Verbeure R. Wischnewski EHS-NA Collaboration 《Zeitschrift fur Physik C Particles and Fields》1989,44(4):573-587
We present data on the production of the baryons Λ, \(\bar \Lambda \) ,p and of the baryon resonances Σ*+ (1385) and Δ++ (1232) inK + p and π+ p interactions at 250 GeV/c. Results are given on total and semi-inclusive cross sections, Feynman-x spectra, transverse momentum distributions and Λ polarization. The data are compared with measurements at lower energies, with deep inclastic lepton nucleon data and with predictions of quark-parton models. The models underestimate Λ production in the central c.m. region, a feature also seen in recent heavy-ion data. This failure can be cured in JETSET 6.3 by adjustment of the di-quark break-up probability. 相似文献
124.
125.
Michael Scholten 《Journal of solid state chemistry》2003,174(2):349-356
The mixed-valent compound In4Br7 undergoes a higher-order phase transition below which leads to a decrease in symmetry from the trigonal to the monoclinic (C2/c) system via . The phase transition has been monitored by X-ray powder diffraction using a linear position-sensitive detector between 15 and , and the crystal structures at room temperature and at 90 K have been refined by means of time-of-flight neutron powder-diffraction data; at , the lattice parameters are , , , and β=98.20(1)°; the new unit cell contains 88 atoms (Z=8) of which 12 are symmetry-independent. Due to their electronic instability because of a second-order Jahn-Teller effect, two of the three crystallographically independent monovalent indium cations are severely affected by the phase transition with respect to their coordination spheres; bond-valence calculations reveal significant strengthening of In+-Br− bonding upon symmetry reduction. Structural changes and group-subgroup relationships as well as possible intermediate phases are discussed. 相似文献
126.
127.
128.
M. F. Lefevere R. W. Frei A. H. M. T. Scholten U. A. Th. Brinkman 《Chromatographia》1982,15(7):459-467
Summary A new photochemical reaction method for the on-line fluorimetric detection of natural vitamin K homologs was developed. In addition to its high sensitivity, the method features an interesting selectivity for the determination of these compounds in a complex matrix such as human serum. The formation of different photolysis products as a function of reaction conditions, and the optimalisation of a segmented flow reaction system will be discussed. The results indicate that the method is 4 times more sensitive than UV detection, and at least as selective as fluorescence detection after post-column chemical reduction. 相似文献
129.
Marc A. M. J. van Zandvoort Danuta Wroabel Andries J. Scholten Dries de Jager Glis van Ginkel Yehudi K. Levine 《Photochemistry and photobiology》1993,58(4):600-606
In this paper we present a spectroscopic study of chlorophyll a in solutions and in anhydrous polyvinyl alcohol films. Absorption, excitation and emission spectra, combined with fluorescence lifetime and time-resolved anisotropy measurements show that chlorophyll a in anhydrous polyvinyl alcohol films exists in a purely monomeric state. Furthermore, it appears that the monomeric chlorophyll a exhibits an efficient excitation energy transfer in this polyvinyl alcohol matrix. These results are rationalized in terms of a model in which the chlorophyll a molecules are located within pockets, formed by the polymer chains. It is concluded that the chlorophyll a-anhydrous polyvinyl alcohol film is a suitable system for studying energy transfer processes, especially because the factors governing energy transfer such as mutual orientation and separation of the molecules can easily be controlled. 相似文献
130.
J. P. Scholten H. J. van der Ploeg 《Journal of polymer science. Part A, Polymer chemistry》1972,10(10):3067-3076
The polymerization of propadiene to 1,2-polyallene by various Rh(I) based catalysts is described and discussed. Also the interrelations between these Rh(I) complexes are discussed and an overall reaction scheme is given. A mechanism is put forward in which the formation of a common intermediate from propadiene and different Rh(I) complexes is the rate determining step. It is found that the activity decreases in the order: cis-Rh(CO)2P(C6H5)3Cl > [Rh(CO)2Cl]2 > Rh(CO)3Cl. The complexes Rh[P(C6H5)3]2(CO)Cl and Rh[P(C6H5)3]3Cl proved to be inactive in the polymerization of propadiene. 相似文献