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Application of the Engineering-Geological Conditions in Land-Use Plans in the Petrvald Region(Czech Republic)

Acta Geologica Sinica(English Edition) 2013年第1期87卷 272-285页

作者： Marian MARSCHALKO Isik YILMAZ Martin BEDNARIK karel kubeka Toms BOUCHAL Faculty of Mining and Geology Institute of Geological EngineeringVSB-Technical University of Ostrava Department of Geological Engineering Faculty of EngineeringCumhuriyet University Department of Engineering Geology Comenius UniversityFaculty of Natural Sciences Department of Building Structures Faculty of Civil EngineeringVSB-Technical University of Ostrava Faculty of Mining and Geology Institute of Environmental EngineeringVSB-Technical University of Ostrava

The objective of this paper is to demonstrate necessity to inform relevant parties about engineering-geological conditions for various practical purposes, especially including appropriate land-use planning. However, the relationship between relevant geological information and the geological environment is vital for foundation engineering purposes, especially where demanding structures are involved. This information is most conveniently structured when accumulated information concerning engineering-geological zones is utilized. This necessarily includes knowledge of rock workability and also of the pre-Quaternary bedrock, and these characteristics were then related to the current built-up area and future development according to the land-use plans in a case study are from the Petrvald Region （Czech Republic）. The geological environment of area has been severely influenced by anthropogenic effects of deep black coal mining. Results of this research showed that future development should be founded on spoil banks, dumps, and settling basins. According to the land-use plan, this zone occupies 44.9% of the area of interest, and its materials predominantly emanate from mining in the Ostrava-karvina Coal District. For future foundation structures planned there, it is imperative to consult detailed engineering-geological study. However, attention to and reliance on this necessity is not reflected in the existing land-use plan.

关键词： Geological environment land-use plan engineering-geological zones workability of rocks,GIS Petrvald Region (Czech Republic)

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Significant intervals of energy transforms in bubbles freely oscillating in liquids

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Journal of Hydrodynamics 2017年第2期29卷 217-225页

作者： karel Vokurka Physics Department Technical University of LiberecLiberecCzech Republic

A wall motion of a bubble freely oscillating in a liquid is studied from the point of view of energy conversions at different instants. It is shown that the time of the bubble oscillation can be divided into two distinct intervals. In the first long interval （here called PK and KP intervals） the prevailing energy conversion is between the potential energy of the bubble and the kinetic energy of the liquid. In the second short interval （here called KI and IK intervals） the kinetic energy of the liquid is transformed into the internal energy of the gas/vapor in the bubble interior and into some other forms of energy. By observing the bubble wall motion in the PK and KP intervals, it is shown that only the value of the maximum bubble radius in the corresponding oscillation can be determined. However, only the knowledge of the maximum bubble radii is insufficient for formulation of a correct theoretical model. Unfortunately this fact is often not noticed in the literature.

关键词： Energy transforms free bubble oscillations energy conversions in bubbles

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Quasi-periodic variations of low energy cosmic rays

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Science China(Technological Sciences) 2016年第4期59卷 547-557页

作者： KUDELA karel SABBAH Ismail IEP SAS Kosice Slovakia Department of Natural Sciences College of Health Sciencesthe Public Authority for Applied Education and TrainingKuwait

Cosmic rays(CR)play an important role in space weather-related *** temporal variability,both of a quasi-periodic character as well as an irregular one,has been studied from ground-based direct measurements,as well as from cosmogenic nuclides,over a long *** attempt to describe the current knowledge of selected quasi-periodicities in CR flux in the energy range above the atmospheric threshold,from direct *** power spectrum density(PSD)of the CR time series as measured by neutron monitors(NMs)and by muon detectors has a rather complicated *** with the shape(slope)of the PSD,knowledge of the contribution of quasi-periodic variations(q-per)to the CR signal is of importance for the modulation,as well as for checking the links of CR to space weather,and/or to space climate *** rotation of the Earth and solar rotation cause two types of mechanisms behind the certain q-per observed in secondary CR on the Earth’s *** activity and solar magnetic field cyclicities contribute to the q-per signals in CR if studied over a longer *** complexity of the spatial structure of the interplanetary magnetic field(IMF)and its evolution within the heliosphere,in addition to the changes in the geomagnetic field,cause variability in contributions of the q-per in *** spectra are useful tools for checking the fine structure of q-per and their temporal *** a long time NMs and muon telescopes provide information about q-per in CR.

关键词： cosmic rays periodicities neutron monitors muon detectors

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On Relations of Vector Optimization Results with C^(1,1) Data

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Acta Mathematica Sinica,English Series 2010年第11期26卷 2031-2040页

作者： Duan BEDNA■íK karel PASTOR Department of Mathematics University of Hradec Králové Department of Mathematical Analysis and Applications of Mathematics Faculty of SciencePalack■ University

In this article we prove that some of the sufficient and necessary optimality conditions obtained by Ginchev, Guerraggio, Luc [Appl. Math., 51, 5-36 （2006）] generalize （strictly） those presented by Guerraggio, Luc [J. Optim. Theory Appl., 109, 615-629 （2001）]. While the former paper shows examples for which the conditions given there are effective but the ones from the latter paper fail, it does not prove that generally the conditions it proposes are stronger. In the present note we complete this comparison with the lacking proof.

关键词： C1'1 function generalized second-order directional derivative Dini derivative weakly efficient minimizer isolated minimizer of second-order

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A Two-Level Method for Nonsymmetric Eigenvalue Problems

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Acta Mathematicae Applicatae Sinica 2005年第1期21卷 1-12页

作者： karel Kolman Mathematical Institute Academy of Sciences of the Czech Republic ■itná 25 11567 Praha 1 Czech Republic

A two-level discretization method for eigenvalue problems is *** to the standard Galerkin finite element discretization technique performed on a fine gridthis method discretizes the eigenvalue problem on a coarse grid and obtains an improved eigenvector(eigenvalue) approximation by solving only a linear problem on the fine grid (or two linear problemsfor the case of eigenvalue approximation of nonsymmetric problems). The improved solution has theasymptotic accuracy of the Galerkin discretization solution. The link between the method and theiterated Galerkin method is established. Error estimates for the general nonsymmetric case arederived.

关键词： eigenvalue problems finite elements postprocessing two-level method two-grid method iterated Galerkin method

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Tribonacci Partition Formulas Modulo m

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Acta Mathematica Sinica,English Series 2010年第3期26卷 465-476页

作者： Ji■í KLA■ka Institute of Mathematics Brno University of Technology

Each Tribonacci sequence starting with an arbitrary triple of integers is periodic modulo m for any modulus m 〉 1. For a given m, the mapping between the set S of all m^3 triples of initial values and the set of their coresponding periods define a partition of the set S. In this paper we shall investigate some basic questions related to these partitions from the point of view of enumerative combinatorics.

关键词： Tribonacci sequence modular periodicity partition formulas

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Computational design of structured chemical products

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Frontiers of Chemical Science and Engineering 2021年第5期15卷 1033-1049页

作者： Faheem Mushtaq Xiang Zhang ka Y.Fung ka M.Ng Department of Chemical and Biological Engineering The Hong Kong University of Science and TechnologyHong KongChina

In chemical product design,the aim is to formulate a product with desired *** and internal product structure are two key drivers of product performance with direct impact on the mechanical,electrical,and thermal ***,there is a keen interest in elucidating the dependence of product performance on ingredients,structure,and the manufacturing process to form the *** of product structure,particularly microstructure,is an intrinsically complex problem that involves different phases of different physicochemical properties,mass fraction,morphology,size distribution,and ***,computational methods have emerged that assist systematic microstructure quantification and *** objective of this paper is to review these computational methods and to show how these methods as well as other developments in product design can work seamlessly in a proposed performance,ingredients,structure,and manufacturing process framework for the design of structured chemical *** begins with the desired target properties and key *** is followed by computation for microstructure and then selection of processing steps to realize this *** framework is illustrated with the design of nanodielectric and die attach adhesive products.

关键词： product design performance ingredients structure manufacturing process framework structured chemical products microstructure design

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Error Estimates for the Time Discretization of a Semilinear Integrodifferential Parabolic Problem with Unknown Memory Kernel

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Numerical Mathematics(Theory,Methods and Applications) 2017年第1期10卷 116-144页

作者： Marijke Grimmonprez karel Van Bockstal Marian Slodicka Department of Mathematical Analysis Ghent UniversityGalglaan 29000 GhentBelgium

This paper is devoted to the study of an inverse problem containing a semilinear integrodifferential parabolic equation with an unknown memory *** equation is accompanied by a Robin boundary *** missing kernel can be recovered from an additional global measurement in integral *** this contribution,an error analysis is performed for a time-discrete numerical scheme based on Backward Euler’s *** theoretical results are supported by some numerical experiments.

关键词： Parabolic inverse problem convolution kernel error estimates

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Flame Synthesis of Zr/ZSM-5 Catalysts with Tunable Acidity for the Oxidative Dehydrogenation of Propane to Propene

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Journal of Thermal Science 2024年第1期33卷 268-283页

作者： DANIEL Samuel FONZEU MONGUEN Cedric karel WU Lingnan TIAN Zhenyu Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

Tuning the surface acidity of ZSM-5 catalyst is essential to achieve desired propene selectivity and *** several ratios of Zr were utilized to modify ZSM-5 via flame spray pyrolysis technique coupled with a pulse spray evaporation *** interaction between Zr and ZSM-5 in the flame influenced the physicochemical and acidity properties of the Zr/*** increasing Zr ratio in ZSM-5 shows coated layers of irregular nano-sized Zr with an increase in crystallite sizes due to the synergetic effect between Zr and *** surface chemical analysis revealed increased lattice oxygen on the Zr modified ZSM-5(1:4) sample compared to other *** acidity analysis revealed the Lewis and Br?nsted acid distribution in the weak and medium acid sites on the catalyst ***,the increase in Zr loading decreased the concentration of Br?nsted acid sites and tuned the catalyst surface to more Lewis acidity,promoting propene selectivity and hindering the over-oxidation of *** modified ZSM-5 catalysts were examined in a fixed bed reactor within 300℃-700℃ at a gas hourly space velocity(GHSV) of 6000 mL·g(catalysts)^(-1)·h^(-1) for the oxidative dehydrogenation of propane(ODHP) to *** the catalysts,Zr/ZSM-5(1:4) exhibited the best propene yield, with 57.19% propane conversion and 75.54% selectivity to propene and the highest *** work provides a promising strategy for tuning the surface acidity of ZSM-5 with Zr for ODHP applications.

关键词： flame synthesis Zr modified ZSM-5 catalyst ODHP surface acidity lattice oxygen

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All-parameters Rayleigh wave inversion

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Earthquake Engineering and Engineering Vibration 2021年第2期20卷 517-534页

作者： Xiao-Hui Yang ka-Veng Yuen State Key Laboratory of Internet of Things for Smart City and Department of Civil and Environmental Engineering University of MacaoMacao 999078China

Since S-wave velocity of the subsurface is an important parameter in near surface applications,many studies have been conducted for its *** the various methods that use surface waves or body waves,Rayleigh wave inversion is the most *** practice,the densities and P-wave velocities of different layers are usually assumed to be known to avoid ill-posed problems,as they have less influence on the dispersion ***,improper assignment of these two groups of parameters leads to inaccurate estimation of the S-wave velocity *** order to address this problem,the all-parameters Rayleigh wave inversion strategy is proposed in which the S-wave velocities,layer thicknesses,densities and P-wave velocities of different layers are included as the unknown parameters for ***,the transitional Markov Chain Monte Carlo(TMCMC)algorithm is applied for the implementation of all-parameters Rayleigh wave *** simulated example and two real-test applications are demonstrated to verify the capability of the proposed method in the estimation of the S-wave velocity profile,the densities and the P-wave ***,it is verified that the proposed method achieved more accurate S-wave velocity profile estimation than the traditional approach.

关键词： all-parameters Rayleigh wave inversion Bayesian S-wave velocity profile TMCMC algorithm uncertainty quantification

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