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1.
We survey recent work on designing and evaluating quantum computing implementations based on nuclear or bound-electron spins in semiconductor heterostructures at low temperatures and in high magnetic fields. General overview is followed by a summary of results of our theoretical calculations of decoherence time scales and spin-spin interactions. The latter were carried out for systems for which the two-dimensional electron gas provides the dominant carrier for spin dynamics via exchange of spin-excitons in the integer quantum Hall regime. 相似文献
2.
R Mott A Grigoriev E Maier J Hoheisel H Lehrach 《Canadian Metallurgical Quarterly》1993,21(8):1965-1974
A complete set of software tools to aid the physical mapping of a genome has been developed and successfully applied to the genomic mapping of the fission yeast Schizosaccharomyces pombe. Two approaches were used for ordering single-copy hybridisation probes: one was based on the simulated annealing algorithm to order all probes, and another on inferring the minimum-spanning subset of the probes using a heuristic filtering procedure. Both algorithms produced almost identical maps, with minor differences in the order of repetitive probes and those having identical hybridisation patterns. A separate algorithm fitted the clones to the established probe order. Approaches for handling experimental noise and repetitive elements are discussed. In addition to these programs and the database management software, tools for visualizing and editing the data are described. The issues of combining the information from different libraries are addressed. Also, ways of handling multiple-copy probes and non-hybridisation data are discussed. 相似文献
3.
Grigoriev O.N. Panasyuk A.D. Brodnikovskyy M.P. Podchernyaeva I.O. Melakh L.M. Yurechko D.V. Vedel D.V. Kozak I.V. 《Powder Metallurgy and Metal Ceramics》2022,60(9-10):626-634
Powder Metallurgy and Metal Ceramics - Hot pressing was used to produce compact ceramic samples with the following composition (wt.%): 60 ZrB2 + 20 SiC + 20 (Al2O3 + 32 t-ZrO2). The tetragonal... 相似文献
4.
5.
V. V. Zuev S. N. Grigoriev V. Yu. Fominski M. A. Volosova A. A. Soloviev 《Technical Physics Letters》2017,43(9):790-793
The possibility of detecting H2 by registering the thermal electromotive force signal, which arises between the surfaces of 6H-SiC plates with a thickness of 400 μm, is established. The working surface of the plates is modified by deposition of a WO x film and catalytic Pt. An ohmic contact (Ni/Pt) is created on the rear surface of the plate, and this surface is maintained at a stabilized temperature of 350°C. The temperature gradient through the plate thickness arises due to the cooling of the working surface with the air medium. The delivery of H2 into this medium up to a concentration of 2% gives rise to a 15-fold increase in the electric signal, which considerably exceeds the Pt/WO x /SiC/Ni/Pt system’s response registered in the usual way by measuring the current–voltage dependence. In this case, an additional power source for the registration of the thermal electromotive force is not required. 相似文献
6.
Dima Stopel Robert Moskovitch Zvi Boger Yuval Shahar Yuval Elovici 《Neural computing & applications》2009,18(7):663-674
Detecting computer worms is a highly challenging task. We present a new approach that uses artificial neural networks (ANN)
to detect the presence of computer worms based on measurements of computer behavior. We compare ANN to three other classification
methods and show the advantages of ANN for detection of known worms. We then proceed to evaluate ANN’s ability to detect the
presence of an unknown worm. As the measurement of a large number of system features may require significant computational
resources, we evaluate three feature selection techniques. We show that, using only five features, one can detect an unknown
worm with an average accuracy of 90%. We use a causal index analysis of our trained ANN to identify rules that explain the
relationships between the selected features and the identity of each worm. Finally, we discuss the possible application of
our approach to host-based intrusion detection systems. 相似文献
7.
8.
We consider graphs that can be embedded on a surface of bounded genus such that each edge has a bounded number of crossings.
We prove that many optimization problems, including maximum
independent set, minimum vertex cover, minimum dominating set and many others, admit polynomial time approximation schemes
when restricted to such graphs. This extends previous results by Baker and Eppstein to a much broader class of graphs. We
also prove that for the considered class of graphs, there are balanced separators of size
where n is a number of vertices in the graph. On the negative side, we prove that it is intractable to recognize the graphs
embeddable in the plane with at most one crossing per edge. 相似文献
9.
The properties of a charge-density wave (CDW) state in quasi-one-dimensional metals in magnetic field below the transition
temperature are studied using the mean-field theory. We calculate the phase diagram and show that the CDW state with shifted
wave vector in high magnetic field (CDWx phase) has at least double-cosine modulation on the most part of the phase diagram. The transition from CDW0 to CDWx state below the critical temperature is accompanied by a jump of the CDW order parameter and of the wave vector rather than
by their continuous increase. This implies a first order transition between these CDW states and explains the strong hysteresis
accompanying this transition in many experiments. We examine how the phase diagram changes in the case of imperfect nesting.
The results are applicable to different families of organic metals. 相似文献
10.
Several classes of regular expressions for timed languages accepted by timed automata have been suggested in the literature. In this article we introduce balanced timed regular expressions with colored parentheses which are equivalent to timed automata, and, differently from existing definitions, do not refer to clock values, and do not use additional operations such as intersection and renaming. 相似文献