Wavelength selection of bidirectional laser transmission based on Monte Carlo method

2017 ◽  
Vol 83 ◽  
pp. 243-251 ◽  
Author(s):  
Chuanxin Zhang ◽  
Xusheng Zhang ◽  
Yuan Yuan ◽  
Qing Ai ◽  
Heping Tan
2010 ◽  
Vol 30 (12) ◽  
pp. 3637-3642 ◽  
Author(s):  
洪明坚 Hong Mingjian ◽  
温泉 Wen Quan ◽  
温志渝 Wen Zhiyu

Author(s):  
Andrew Feldick ◽  
Michael F. Modest

A method for the application of importance sampling to wavelength selection in ray tracing Monte Carlo solvers is introduced. In this method individual lines are treated independently, and probability distribution and weighting functions are applied to individual lines. The method reduces the number of photons required to reach the same statistical precision as the standard Monte Carlo method.


2017 ◽  
pp. 46-52
Author(s):  
F. V. Motsnyi ◽  
M. E. Sinytskyi

Carbon nanomaterials (graphene, nanotubes, fullerenes, the family of derivatives from C ) belong to the miraculous materials of 21 century, which can radically change technologies in the coming years. Thus, unique supercapacitors with the capacity of 10.000 F have been proposed on their basis, which is 12.5 thousand higher than the capacity of the Earth. Immense funds have been invested globally in research of carbon nanomaterials and development of devices on their basis. Utilization of scientific advancements in the domestic industry will promote economic growth, innovation society building and market recovery in Ukraine. This article is the first to pose the question about selection of advanced developments projects on the basis of carbon nanomaterials using Monte Carlo method. Investment projects for high tech scientific developments (nanotubes, nanobatteries, supercapacitors, nanoaccumulators) are analyzed. Approaches to account for the risks of investment projects in the conditions of non-established stock market in Ukraine are shown. Use of Monte Carlo method as the most preferred approach to evaluating the impact of risks on decision-making in the conditions of uncertainty is substantiated. Current market prices on respective products are used as the input database. The Net Present Value (NPV) and the probability of its negative numbers are computed. The point of the project reliability at which the probability of negative NPV numbers approximates zero is found. It is shown that this point can be used as the benchmark, because the relative distance to it is the criterion for selection of the most acceptable version of project implementation. The projects with minimal expected risks of implementation are selected.


2015 ◽  
Vol 20 (9) ◽  
pp. 095014 ◽  
Author(s):  
Dong Li ◽  
Bin Chen ◽  
Wei Yu Ran ◽  
Guo Xiang Wang ◽  
Wen Juan Wu

1974 ◽  
Vol 22 ◽  
pp. 307 ◽  
Author(s):  
Zdenek Sekanina

AbstractIt is suggested that the outbursts of Periodic Comet Schwassmann-Wachmann 1 are triggered by impacts of interplanetary boulders on the surface of the comet’s nucleus. The existence of a cloud of such boulders in interplanetary space was predicted by Harwit (1967). We have used the hypothesis to calculate the characteristics of the outbursts – such as their mean rate, optically important dimensions of ejected debris, expansion velocity of the ejecta, maximum diameter of the expanding cloud before it fades out, and the magnitude of the accompanying orbital impulse – and found them reasonably consistent with observations, if the solid constituent of the comet is assumed in the form of a porous matrix of lowstrength meteoric material. A Monte Carlo method was applied to simulate the distributions of impacts, their directions and impact velocities.


Author(s):  
Makoto Shiojiri ◽  
Toshiyuki Isshiki ◽  
Tetsuya Fudaba ◽  
Yoshihiro Hirota

In hexagonal Se crystal each atom is covalently bound to two others to form an endless spiral chain, and in Sb crystal each atom to three others to form an extended puckered sheet. Such chains and sheets may be regarded as one- and two- dimensional molecules, respectively. In this paper we investigate the structures in amorphous state of these elements and the crystallization.HRTEM and ED images of vacuum-deposited amorphous Se and Sb films were taken with a JEM-200CX electron microscope (Cs=1.2 mm). The structure models of amorphous films were constructed on a computer by Monte Carlo method. Generated atoms were subsequently deposited on a space of 2 nm×2 nm as they fulfiled the binding condition, to form a film 5 nm thick (Fig. 1a-1c). An improvement on a previous computer program has been made as to realize the actual film formation. Radial distribution fuction (RDF) curves, ED intensities and HRTEM images for the constructed structure models were calculated, and compared with the observed ones.


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