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排序方式: 共有95条查询结果,搜索用时 62 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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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
6.
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
7.
We demonstrate full characterization of femtosecond pulse distortion induced by all-order polarization mode dispersion (PMD) at selected polarization states via second-harmonic generation (SHG) frequency-resolved optical gating (FROG) measurements at an average power of under 28 nW. By applying the inverse of the measured spectral phase via a programmable pulse shaper, we compress the distorted pulses from more than 3 ps to nearly bandwidth-limited durations of less than 500 fs. Our results show that SHG FROG measurements performed by using fiber-pigtailed aperiodically poled lithium niobate waveguides can serve as a robust and sensitive tool for characterization of PMD-induced spectral phase. 相似文献
8.
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
9.
Rostislav Vodák 《Nonlinear Analysis: Real World Applications》2011,12(6):3421-3441
In this paper, an asymptotic one dimensional model for a clamped curved rod is rigorously derived as a limit of respective three dimensional models. The rod is made of isotropic elastic, heat conductive linearly responding material. Asymptotic analysis is used with respect to the thickness of domains. 相似文献
10.
We introduce notions of absolutely non-free and perfectly non-free group actions and use them to study the associated unitary representations. We show that every weakly branch group acting on a regular rooted tree acts absolutely non-freely on the boundary of the tree. Using this result and the symmetrized diagonal actions we construct for every countable branch group infinitely many different ergodic perfectly non-free actions, infinitely many II1-factor representations, and infinitely many continuous ergodic invariant random subgroups. 相似文献