排序方式: 共有71条查询结果,搜索用时 15 毫秒
41.
Arthur Jaffe Slawomir Klimek Andrzej Lesniewski 《Communications in Mathematical Physics》1989,126(2):421-431
We formulate reflection positivity for meromorphic functions and for 1-forms on a Riemann surface. This construction yields representations of the Heisenberg algebra on a Riemann surface.Supported in part by the Department of Energy under Grant DE-FG02-88ER25065 相似文献
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Arthur Jaffe Andrzej Lesniewski Christian Wieczerkowski 《Letters in Mathematical Physics》1988,16(4):385-388
We study the spectral condition for supersymmetric Wess-Zumino field theories on a cylindrical spacetime. This condition is preserved under certain ultraviolet cutoff procedures and also leads to analyticity of HKR regularized field operators in a complex neighborhood of spacetime.Supported in part by the National Science Foundation under Grant DMS/PHY86-45122.Supported in part by a German National Scholarship. 相似文献
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A set of axioms which fix Euclidean renormalizations up to a finite renormalization is proposed. There exists a one to one correspondence between Euclidean renormalizations and renormalizations in Minkowski space-time satisfying Hepp's axioms. No restrictions on masses are imposed. 相似文献
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Liang Wang Die Yang Zuliang Chen Peter J. Lesniewski Ravi Naidu 《Journal of Chemometrics》2014,28(6):491-498
The paper introduces a novel chemometric strategy based on independent component analysis (ICA) coupled with a back‐propagation neural network. In this approach, one of the most popular ICA methods, the fast fixed‐point algorithm for ICA (fastICA), was implemented by the genetic algorithm (geneticICA) to avoid the local maxima problem commonly observed with fastICA. As a case study, an ion‐selective electrode (ISE) array, consisting of three working electrodes and one reference electrode, was used for the simultaneous determination of three heavy metals (cadmium, copper, and lead) in aqueous solutions, which are normally prone to severe interferences. The robustness and appropriateness of the approach were assessed using the average mean of relative error (MRE) of triplicated external validation. After configuration and optimization, the average MRE for Cu was <5%. For the determination of Cd and Pb, whose ISEs normally cannot tolerate Cu ions even at the microgram per liter levels, the MREs were 8%. This article demonstrated that this approach can be applied to the detection of heavy metal contamination in industrial wastewater with prediction accuracies comparable with other popular quantitative chemometric neural network methods. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
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Three sharp absorption features in the energy range 2.36–2.55 eV have been detected in the transmission spectrum of Co-diffused ZnSe, and a number of luminescence transitions originating from the lowest of these states at 2.361 eV have been observed. Photoluminescence excitation spectra prove that these are high energy excited states of the Co2+Zn impurity, a conclusion confirmed by comparison of measured and predicted luminescence energies. This represents the first identification of luminescence branching from a higher excited state of a transition metal ion in any semiconductor. The sharp, weakly phonon-coupled transitions involve either intra-impurity excitation or transitions from the impurity to localised states split off from a minimum in the conduction band. The implications of these observations for the mechanism of host-impurity energy transfer and for the nature of the excited state wavefunctions are discussed. 相似文献
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Gold–carbon three dimensional film electrode was prepared from oppositely charged conductive particles by layer-by-layer approach. This was done by alternative immersion of indium tin oxide plate into suspension of positive (gold) and negative (carbon) particles. The film formation is confirmed by scanning electron microscopy. The nanoparticulate film is stable and the obtained electrode exhibits catalytic current of dioxygen reduction connected with the presence of gold nanoparticles. After adsorption of bilirubin oxidase similar effect is observed with substantial decrease of overpotential – typical for bioelectrocatalytic reaction. Both catalytic currents are proportional to the number of immersion and withdrawal steps. 相似文献
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Zhou SZ Sey M De Clercq PJ Milanesio M Viterbo D 《Angewandte Chemie (International ed. in English)》2000,39(16):2861-2863
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Gunter S Wolf RC Leuterer F Gruber O Kaufmann M Lackner K Maraschek M Mc Carthy PJ Meister H Peeters A Pereverzev G Salzmann H Schade S Schweinzer J Suttrop W 《Physical review letters》2000,84(14):3097-3100
Internal transport barriers have been demonstrated to exist also under conditions with T(e) approximately T(i) approximately 10 keV and predominant electron heating of the tokamak core region. Central electron cyclotron heating was added to neutral beam injection-heated ASDEX Upgrade discharges with a preexisting internal transport barrier, established through programmed current ramping leading to shear reversal. Compared to a reference internal transport barrier discharge without electron cyclotron resonance heating, the electron heat conductivity in the barrier region was found not to increase, in spite of a fivefold increase in electron heat flux, and also angular momentum and ion energy transport did not deteriorate. 相似文献