Papers by Keyword: Monte-Carlo Method (MC-Method)

Abstract: Processing the parameters overly simplistic will leave space for overestimating or underestimating artificially when we assess the assets of medium and small hydropower stations using present earning value method. And absolute assumptions often affect the adequacy of the assessment results, also the persuasive and credibility. Monte Carlo simulation can determine the wave of parameters in present earning value method, so as to improve the persuasion and credibility of assessment results and reduce the personnel control.

Abstract: In an agreement of a BOT project, concession period is one of the core terms that directly influence the benefits of all parties and the success of a project. Concession period has aroused the attention of both domestic and foreign scholars. This paper summarizes the main influencing factors of the concession period, simulating the NPV of the project income in Monte Carlo method with the probability distribution of the actual situation, selecting corresponding concession period according to a reasonable level of IRR. Based on the simulation results, the scheme of the highest comprehensive utility can be approached with the help of multi-objective fuzzy evaluation model for scheme optimization. And it also provides a possible solution for concession period strategy through the proof of a case.

Abstract: A large number of column-bracing systems for the horizontal braces unlocated at middle of columns with fixed-ended column base were modeled and analyzed by second-order analysis using finite element method, in which the random combination of the initial imperfections between columns and horizontal braces was well considered by Monte Carlo method. According to the analysis results, two kinds of instability modes of column-bracing system have been found, probability density function of the horizontal bracing forces unlocated at middle of columns with fixed-ended column base is established based on probability statistics, and the design formula of horizontal braces unlocated at middle of columns are also proposed.

Abstract: Since the application restrictions of JC method for hydraulic structures reliability, and the drawbacks of Monte Carlo method for large and complex hydraulic structures, this paper combines MATLAB with Monte Carlo method to analysis and calculate hydraulic structures reliability. Also, this paper puts forward the grading standards for hydraulic structures reliability. Taking a masonry gravity dam for example, using the Monte Carlo method and MATLAB programming to analysis the dam's sliding and strength failure risk, and then grading the dam. The results show that the application of MATLAB-based Monte Carlo method in hydraulic structures reliability is simple and quick, with good usability and operability.

Abstract: In this paper we consider an approach, which allows the research of order-disorder transitionin lattice systems (with any distribution of the exchange integrals) in the frame of Ising model. Anew order parameters, which can give a description of a phase transitions, are found. The commondefinition of such order parameter is the mean value of percolation cluster size. Percolation clusterincludes spins in ground state. The transition from absolute disorder to correlated phase could bestudied with using of percolation theory methods.

Abstract: The critical phenomena on cobalt monolayer films were studied by means of computersimulation. Proposed approach on the base of data of scanning tunneling microscopy gives possibilityestimate of critical concentration needed for concentration transition into ferromagnetic state. Assumptionabout presence of critical switching field allowed simulated hysteresis loops for given 1.5,2.0, 2.5 and 3.0 ML cobalt samples in frame of Ising model, which ones have qualitative agreementwith magnetometric data.

Abstract: During the latest years the parallel structure robots have been used more and more due to their advantages that consist of: high stiffness, availability for usage at higher speed and acceleration rates, compared to the serial structure robots [. The robots with Delta 3DOF parallel structure are met in the fields where the handling of light objects at high speeds and accelerations is required. One of the disadvantages of the parallel structure robots compared to the serial structure robots would be the fact that the first have a quite narrow work space. For this reason the researches on the analysis and optimization of the work space intensified in the last period of time. This work is approaching the analysis of the work space of the robots with Delta 3DOF parallel structure, by using a method that has a numerical solving. The usage of this method is advantageous in terms of the relatively short time needed for determining the shape and volume of the work space, compared to the other numerical methods.

Abstract: Two-sublattice magnets with competing direct exchange interactions can exhibit spin-glass properties. It is shown that the Ising model on a 2D lattice with z = 8 nearest neighbors takes place divergence between the ZFC and FC magnetization curves. It was shown, that a weak antiferromagnetic interaction between ferromagnetically ordered sublattices with approximately similar values of the magnetic moments in the sites can lead to very complex magnetic properties. Theoretical magnetic phase diagram for the structures with random dilution was built.

Abstract: In order to further understand the transmission characteristics of UV-light signal, this paper, based on the algorithmic model of Monte Carlo method of UV-light non-line-of-sight transmission, conducts the simulation analysis of the obstacle impact on UV-light signal transmission characteristics in the atmosphere. The results show that due to the presence of obstacle, the blind region of detection appears; this blind region is related to the distance of the obstacle, as well as to transmission elevation angle, receiving elevation angle and obstacle height of obstacle. The obstacle exerts a slight influence on energy intensity, but just its height changes the range of blind region detection. The transmission elevation angle and the receiving elevation angle, in case of the presence or absence of the obstacle, have two energy distribution peaks which change to some extent, and the energy attenuation is more significant in case of the absence of the obstacle.

Abstract: Monte Carlo (MC) method and molecular dynamics (MD) are combined to analyze the influence of ageing on mechanical properties of machined nanostructures. Single crystal copper workpiece is first cut in MD simulation, and then the machined workpiece is used in MC simulation of ageing process, finally the tensile mechanical properties of machined nanostructures before and after ageing are investigated by MD simulation. The results show that machining process and ageing have obvious influence of tensile mechanical properties. After machining, the yield strength, yield strain, fracture strain and elastic modulus reduce by 36.02%, 28.86%, 20.79% and 7.16% respectively. However, the yield strength, yield strain and elastic modulus increase by 4.84%, 1.41% and 1.02% respectively, fracture strain reduce by 24.53% after ageing process. To research the ageing processes of machined nanostructures by MC simulation is both practical and meaningful.