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971.
Levin Eugene M. Furst Hilton Kallmann Hartmut 《IEEE transactions on nuclear science》1968,15(3):114-116
Under high energy excitation, organic molecules are generally excited to electronic states above the first excited state. Since, at not too high solute concentrations, energy transfer in organic liquid scintillators occurs via the first excited electronic state, the efficiency of degradation to this state affects the overall light output. Experimental results for a number of systems, at temperatures from 20°C to 24°C are reported. It was found that the efficiency of degradation to the first excited state generally decreases with increasing temperature, with some variation among the solvents tested. It was found that; the greater the efficiency of degradation to the first excited state at 20°C, the less this efficiency varies with temperature. 相似文献
972.
Hartmut Prautzsch 《Computer Aided Geometric Design》1984,1(1):95-96
A short proof of the Oslo algorithm is presented that uses a simple comparison of coefficients 相似文献
973.
We discuss a mathematical model arising in the filtration of a fluid through a porous medium. The model leads to a free boundary value problem whose governing equation depends on the retention function. A numerical approximation by means of finite elements is used to obtain an existence and uniqueness theorem along with an error estimate for a linear retention function. 相似文献
974.
975.
The development of advanced water electrolysis was one of the main tasks of the R & D programme on hydrogen funded, within its main R & D programme on Energy, by the Commission of the European Communities. Most of the work has been concentrated on the development of alkaline water electrolysis, as this process appears particularly promising. (Water electrolysis based on ‘acidic’ solid polymer electrolytes, developed during the last 10 years, seems to be a potentially attractive alternative technology, at least for electrolysers of smaller scale (up to 100kW). Even at this size, however, there is not yet evidence of any overall economic advantage over advanced alkaline cells.) The results of 9 years of R & D in this field are critically examined, by reviewing the improvements achieved on the components of the electrolytic cell as well as the overall modification of the cell design. The anode, cathode and diaphragm have been the components investigated, but also the constituent materials, the nature of the electrolyte and its operating conditions have been dealt with. Three main lines of advanced electrolyser development were identified in the course of these investigations. The corresponding charcteristics are:
- low temperature (70°C to 90°C), low current density (i=0.1–0.3 A cm?2);
- moderate temperature (<120°C), high current density (i up to 1 A cm?2), medium pressure (5–10 bars);
- medium temperature (120–160°C), high current density (i=1–2 A cm?2), moderately high pressure (30 bars).
976.
Melting behavior in the system sand-potash-dolomite was found to depend strongly on the amount of H2 O added to the batch, which was varied from 0.5 to 9.0 wt%. This dependence holds primarily for the formation and dissolution of K2 Ca(CO3 )2 , but other compounds are also influenced, e.g., α-K2 MgSi3 O8 , CaMgSiO4 , Ca2 MgSi2 O7 , andCaSiO3 . 相似文献
977.
978.
Hartmut Logemann 《Systems & Control Letters》1987,9(5):393-400
This paper investigates the stability of linear autonomous multivariable neutral systems from an input—output viewpoint. Several frequency-domain and input—output characterizations for exponential stability of neutral systems are given. We provide two examples which illustrate that the behaviour of neutral systems may be quite different from that of retarded systems. Moreover we give necessary and sufficient conditions for the transfer functions of a neutral system to belong to certain algebras of meromorphic functions introduced in this paper. 相似文献
979.
Component-based software engineering needs to be backed by thorough formal concepts and modeling techniques. This paper combines two concepts introduced independently by the two authors in previous papers. On one hand, the concept of Petri net modules introduced at IDPT 2002 in Padberg [J. Padberg, Petri net modules, Journal on Integrated Design and Process Technology 6 (4) (2002) 105–120], and on the other hand a generic component framework for system modeling introduced at FASE 2002 in Ehrig et al. [H. Ehrig, F. Orejas, B. Braatz, M. Klein, M. Piirainen, A generic component concept for system modeling, in: Proceedings of FASE ’02, Lecture Notes in Computer Science, vol. 2306, Springer, 2002]. First we develop a categorical formalization of the transformation based approach to components that is based on pushouts. This is the frame in which we show that Petri net modules can be considered as an instantiation of the generic component framework. This allows applying the transformation based semantics and compositionality result of the generic framework to Petri net modules. In addition to general Petri net modules we introduce Petri net modules preserving safety properties which can be considered as another instantiation of pushout based formalization of the generic framework. 相似文献
980.
Web services providers can use the WS-QoS framework to achieve QoS differentiation by integrating various aspects of distinct communication layers. An architecture based on the framework supports resource-constrained mobile devices, which will generate a large percentage of Web service requests in the future 相似文献