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排序方式: 共有206条查询结果,搜索用时 15 毫秒
51.
D Helman Y Sandowski Y Cohen A Matsumoto A Yoshimura S Merchav A Gertler 《Canadian Metallurgical Quarterly》1998,441(2):287-291
In vivo microdialysis was used to measure release of endogenous l-glutamate and l-aspartate in the nucleus tractus solitarius of the anaesthetised rat evoked by baroreceptor loading. Aortic constriction, the method of loading, elicited a reproducible increase in extracellular levels of l-glutamate to 322+/-139% of basal levels, which could be attenuated by concomitant local administration of the nicotinic acetylcholine receptor antagonist mecamylamine (100 microM). 相似文献
52.
Janos H. Endler 《Israel journal of chemistry》1985,25(1):3-10
Irradiation of surfactant vesicles prepared from (C18H37)2 N+(CH3)C6H4-CHCH2p,CT−, 1, [C15H31CO2(CH2)2]2N+(CH3)CH2C6H4CHCH2,CL− 2, and (C18-H37)2N+(CH3)CH2CH2OCOC6H4CHCH2p,Br−, 3, by ultraviolet light or by bursts of 266 nm laser pulses have resulted in the loss of styrene absorbances. This process has been accounted for in terms of a model which considers intravesicular surface reactions to give polymers with average chainlength of 22. Degreees of photopolymerization have been determined in vesicles prepared from 3 subsequent to separating the polystryrene, formed in the photolysis, from the surfactants. Vesicle surface photopolymerizations result in aqueous cleft formation and in enhanced stabilities. Polymerized vesicles provide media for in situ generation of colloidal catalysts and semiconductors. 相似文献
53.
Janos B. Zhelev 《Drying Technology》2013,31(3):477-485
1nvest.igation of flow pattern in a cocurrent disk spray dryer by means of measurement, of the kernel function is described. The obtained measurement results not only inform on the air flow type but ran be directly applied as input in the integral equation based simulation of heat and mass transfer. 相似文献
54.
Balazs Feil Balazs Balasko Janos Abonyi 《Soft Computing - A Fusion of Foundations, Methodologies and Applications》2007,11(5):479-488
Since in practical data mining problems high-dimensional data are clustered, the resulting clusters are high-dimensional geometrical
objects, which are difficult to analyze and interpret. Cluster validity measures try to solve this problem by providing a
single numerical value. As a low dimensional graphical representation of the clusters could be much more informative than
such a single value, this paper proposes a new tool for the visualization of fuzzy clustering results. By using the basic
properties of fuzzy clustering algorithms, this new tool maps the cluster centers and the data such that the distances between
the clusters and the data-points are preserved. During the iterative mapping process, the algorithm uses the membership values
of the data and minimizes an objective function similar to the original clustering algorithm. Comparing to the original Sammon
mapping not only reliable cluster shapes are obtained but the numerical complexity of the algorithm is also drastically reduced.
The developed tool has been applied for visualization of reconstructed phase space trajectories of chaotic systems. The case
study demonstrates that proposed FUZZSAMM algorithm is a useful tool in user-guided clustering. 相似文献
55.
Unknown unitary transforms may be compared to each other in a way which makes it possible to obtain an unambiguous answer, indicating that the transforms are different, already after a single application of each transform. Quantum comparison strategies may be useful for example if we want to test the performance of individual gates in a quantum information or quantum computing network. It is then possible to check for errors by comparing the elements to a master copy of the gate, instead of performing a complete tomography of the gate. In this paper we propose a versatile linear optical implementation based on the Franson interferometer with short and long arms. A click in the wrong output port unambiguously determines that the tested gate is faulty. This set-up can also be used for a variety of other tasks, such as confirming that the two transforms do not commute or do not anticommute. 相似文献
56.
Janos Abonyi Lajos Nagy Ferenc Szeifert 《International journal of systems science》2013,44(4):457-466
This paper looks at a new method of modelling nonlinear dynamic processes, using grid-type Takagi-Sugeno fuzzy models and a priori knowledge. The proposed hybrid fuzzy convolution dynamic model consists of a non-linear fuzzy steady-state static and a gainindependent impulse response model-based dynamic part. The modelling of nonlinear pH processes is chosen as a realistic case study for demonstration of the proposed modelling approach. The off-line identified hybrid fuzzy convolution model is shown to be capable of modelling the nonlinear process and providing better multiple-step prediction than the conventional grid-type Takagi-Sugeno fuzzy model. 相似文献
57.
Summary We present space-efficient-O(log2
n)-deterministic algorithms for some graph theoretical problems such as planarity testing, producing a plane embedding, finding minimum cost spanning trees, obtaining the connected, biconnected and triconnected components of a graph. Previous planarity algorithms used (n) space. Several algorithms are based on a space-efficient matrix inversion method. The same bounds hold for uniform circuit depth.Research partially supported by NSF grants No. MCS 79-05006 and MCS 78-27600. 相似文献
58.
Huang X Miao H Nelson J Turner J Steinbrener J Shapiro D Kirz J Jacobsen C 《Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment》2011,638(1):171-175
Cryogenic microscopy allows one to view frozen hydrated biological and soft matter specimens with good structural preservation and a high degree of stability against radiation damage. We describe a liquid nitrogen-cooled anti-contamination device for cryogenic X-ray diffraction microscopy. The anti-contaminator greatly reduces the buildup of ice layers on the specimen due to condensation of residual water vapor in the experimental vacuum chamber. We show by coherent X-ray diffraction measurements that this leads to fivefold reduction of background scattering, which is important for far-field X-ray diffraction microscopy of biological specimens. 相似文献
59.
Local and global mappings of topology representing networks 总被引:1,自引:0,他引:1
As data analysis tasks often have to deal with complex data structures, the nonlinear dimensionality reduction methods play an important role in exploratory data analysis. In the literature a number of nonlinear dimensionality reduction techniques have been proposed (e.g. Sammon mapping, Locally Linear Embedding). These techniques attempt to preserve either the local or the global geometry of the original data, and they perform metric or non-metric dimensionality reduction. Nevertheless, it is difficult to apply most of them to large data sets. There is a need for new algorithms that are able to combine vector quantisation and mapping methods in order to visualise the data structure in a low-dimensional vector space. In this paper we define a new class of algorithms to quantify and disclose the data structure, that are based on the topology representing networks and apply different mapping methods to the low-dimensional visualisation. Not only existing methods are combined for that purpose but also a novel group of mapping methods (Topology Representing Network Map) are introduced as a part of this class. Topology Representing Network Maps utilise the main benefits of the topology representing networks and of the multidimensional scaling methods to disclose the real structure of the data set under study. To determine the main properties of the topology representing network based mapping methods, a detailed analysis of classical benchmark examples (Wine and Optical Recognition of Handwritten Digits data set) is presented. 相似文献
60.
C. Berger A. Gabutti S. Janos P. Carelli M. G. Castellano R. Leoni D. Peschiaroli 《Journal of Low Temperature Physics》1993,93(3-4):509-514
The presented results are part of a feasibility study of superheated superconducting microstructure detectors. The microstructures (dots) were fabricated using thin film patterning techniques with diameters ranging from50µm up to500µm and thickness of1µm. We used arrays and single dots to study the dynamics of the superheating and supercooling phase transitions in a magnetic field parallel to the dot surface. The phase transitions were produced by either varying the applied magnetic field strength at a constant temperature or changing the bath temperature at a constant field. Preliminary results on the dynamics of the phase transitions of arrays and single indium dots will be reported. 相似文献