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排序方式: 共有95条查询结果,搜索用时 10 毫秒
1.
Rostislav Vodák 《Mathematical Methods in the Applied Sciences》2007,30(1):43-75
We consider a sequence of curved rods which consist of isotropic material and which are clamped on the lower base or on both bases. We study the asymptotic behaviour of the stress tensor and displacement under the assumptions of linearized elasticity when the cross‐sectional diameter of the rods tends to zero and the body force is given in the particular form. The analysis covers the case of a non‐smooth limit line of centroids. We show how the body force and the choice of the approximating curved rods can affect the strong convergence and the limit form of the stress tensor for the curved rods clamped on both bases. Copyright © 2006 John Wiley & Sons, Ltd. 相似文献
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Sergey S. Golotvin Rostislav Pol Ryan R. Sasaki Asya Nikitina Philip Keyes 《Magnetic resonance in chemistry : MRC》2012,50(6):429-435
Automated structure verification using 1H NMR data or a combination of 1H and heteronuclear single‐quantum correlation (HSQC) data is gaining more interest as a routine application for qualitative evaluation of large compound libraries produced by synthetic chemistry. The goal of this automated software method is to identify a manageable subset of compounds and data that require human review. In practice, the automated method will flag structure and data combinations that exhibit some inconsistency (i.e. strange chemical shifts, conflicts in multiplicity, or overestimated and underestimated integration values) and validate those that appear consistent. One drawback of this approach is that no automated system can guarantee that all passing structures are indeed correct structures. The major reason for this is that approaches using only 1H or even 1H and HSQC spectra often do not provide sufficient information to properly distinguish between similar structures. Therefore, current implementations of automated structure verification systems allow, in principle, false positive results. Presented in this work is a method that greatly reduces the probability of an automated validation system passing incorrect structures (i.e. false positives). This novel method was applied to automatically validate 127 non‐proprietary compounds from several commercial sources. Presented also is the impact of this approach on false positive and false negative results. Copyright © 2012 John Wiley & Sons, Ltd. 相似文献
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Alexander Vatulyan Sergey Nesterov Rostislav Nedin 《Continuum Mechanics and Thermodynamics》2020,32(4):1173-1186
In present research, we investigate dynamic coupled thermoelasticity problem for a “coating-substrate” system. We present a number of models of thermoelastic deformation of the “coating-substrate” system with thermomechanical characteristics which may vary both continuously and discontinuously. To solve these problems, we use the variational principle of coupled thermoelasticity in the Laplace transforms space and hypotheses on a distribution of temperature and displacements transforms. The transforms inversion is realized according to the Durbin method. The calculations were carried out based on both proposed simplified models and FEM. 相似文献
6.
Rostislav A. Andrievski Svetlana V. Klyuchareva 《Journal of nanoparticle research》2011,13(12):6221-6230
The nanotechnology development is accompanied by an intensive growth of information flow which is specially noticeable as
applied to journal information flow. Now over the world there are the 69 nano-titled journals with the impact factor and/or
a settled periodicity as well as the 70 those which lack stability periodicity and are in an organization stage. Only 49 nano-titled
have the impact factor with the comparatively high mean value of about 3.44. The domestic nano-titled journals published in
Russia, India, China, and other countries are also considered. The attention is taken that in the 2006–2010 period the 95
new nano-titled journals were organized and in 2011 this process is continuing and seems to be the most impressive. Many nano-related
journals (including classical physical, chemical and materials science ones) are also described and discussed. 相似文献
7.
Rostislav?E.?MaiborodaEmail author Natalia?M.?Markovich 《Computational Statistics》2004,19(4):569-592
Summary Common non-parametric estimators of a probability density function (PDF) show bad performance for heavy-tailed PDFs. Using
a parametric approximation of the true cumulative distribution function (CDF), the transformation-retransformation of the
data is explored here as a useful tool for the reliable PDF prediction. The PDF estimators are compared by their capacity
to solve a classification problem. Simulation results and an application to Web data analysis are presented, too. 相似文献
8.
Veselov Mark S. Ivanenkov Yan A. Yamidanov Renat S. Osterman Ilya A. Sergiev Petr V. Aladinskiy Vladimir A. Aladinskaya Anastasia V. Terentiev Victor A. Ayginin Andrey A. Skvortsov Dmitry A. Komarova Katerina S. Chemeris Alexey V. Baimiev Alexey Kh. Sofronova Alina A. Machulkin Alexey E. Petrov Rostislav A. Maklakova Svetlana Yu. Bezrukov Dmitry S. Filkov Gleb I. Zainullina Liana F. Maximova Marina A. Zileeva Zulfiya R. Kartsev Victor G. Vakhitova Yulia V. Dontsova Olga A. 《Molecular diversity》2020,24(1):233-239
Molecular Diversity - A series of 5-oxo-4H-pyrrolo[3,2-b]pyridine derivatives was identified as novel class of highly potent antibacterial agents during an extensive large-scale high-throughput... 相似文献
9.
Dmitry S. Ryabukhin Anna D. Lisakova Anna S. Zalivatskaya Irina A. Boyarskaya Galina L. Starova Rostislav E. Trifonov Vladimir A. Ostrovskii Aleksander V. Vasilyev 《Tetrahedron》2018,74(15):1838-1849
Reaction of 5-arylethynyl-2-methyl-2H-tetrazoles (acetylene tetrazoles) with arenes under the action of Brønsted superacid CF3SO3H or acidic zeolite HUSY CBV-720 gives rise to E-/Z-5-(2,2-diarylethenyl)-2-methyl-2H-tetrazoles, as products of hydroarylation of acetylene bond, in yields up to 98% with predominant formation of E-isomers. Cationic intermediates of these reactions have been studied theoretically by DFT calculations. Addition of CF3SO3H to the triple bond of acetylene tetrazoles leads to the corresponding E-/Z-vinyl triflates in high yields. Hydration of triple bond in these tetrazoles in H2SO4 results in the formation of 5-(2-aryl-2-oxoethyl)-2-methyl-2H-tetrazoles. Tandem hydroarylation-ionic hydrogenation of acetylene tetrazoles in the systems acid(CF3SO3H or AlCl3)-arene-cyclohexane affords 5-(2,2-diarylethyl)-2-methyl-2H-tetrazoles. 相似文献
10.
Rostislav Červenka Antonín Bednařík Josef Komárek Markéta Ondračková Pavel Jurajda Tomáš Vítek Petr Spurný 《Central European Journal of Chemistry》2011,9(6):1109-1116
The determination of mercury in fish typically involves analysis of muscles. For predicting the concentration of mercury in
fish muscle on the basis of the analysis of fish scales or fins, the relationship between total mercury concentrations in
fish muscles and in fish scales and fins was studied. Mercury content in fish muscles, scales and fins was determined by atomic
absorption spectrometry with thermal decomposition of the sample in a flow of oxygen. A number of scale treatments were applied
in order to remove impurities and to enhance the prediction quality. For scale treatment, 40 min of washing with DI water
in an ultrasonic bath is recommended. A coefficient of determination r2= 0.93 for the relationship between Hg concentrations in muscles and scales was achieved for 40 fish among the different fish
species tested (European bream, perch, roach) from the Hamry Reservoir, Czech Republic. With respect to fin sampling, the
coefficient of determination r2 for these fish was 0.86. The analysis of fish scales and caudal fins is a useful screening tool for assessing the relative
mercury contamination of monitored fish. The method of sampling scales is not suitable for fish species with small scales
such as brown trout.
相似文献