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Helical fiber Bragg grating (H-FBG) induced by UV-side exposure exhibits wavelength-dependent coupling between different modes. In this paper, we propose an effective method to generate high-order optical vortices (OVs) using H-FBG written in a multimode fiber. We simulate the conversion of OVs with different topological charges: 0 → ± 1, ±1 → 0, 0 → ± 2, 0 → ± 3 with conversion efficiency as high...
The efficiency of Chinese stock market is slightly inferior to the stock market of the U.S., but the stabilization is far weaker than it. The main drawback is that the production and release of information are out of control. Governors of Chinese stock market should pay their main attention to the executing of the policies and laws.
Facing with the more and more complicated economic circumstances, how to recognize and evaluate risk in economical activities of state-owned enterprises has been an importance issue needing the administrators concern. Because of it, this paper combines the features of the state-owned enterprises to analyze main risk factors during the running of the enterprises and constructs a set of comprehensive...
In view of fuzziness of university teaching quality evaluation, AHP-based multi-level fuzzy comprehensive evaluation model become the advantage model for university teaching quality assessment. It is of great importance to evaluate scientifically teachers' teaching quality in the classroom. The methods of AHP and Fuzzy comprehensive evaluation are applied to evaluation of classroom teaching quality...
With the theory of sustainable development as guide for the agriculture of China, farmland in Houhu region of the Jianghan Plain in China was selected for case-study on introduction of the niche-fitness theory into multi-suitability evaluation of tillage. Quantitative analysis of niche-fitness and restrictive factors for rice, wheat, cotton and rape, were carried out by means of calculating niche-fitness...
In general, the distance measuring method could only measure the pattern similarities of the time series with the same length. Through introducing the concept of dynamic time warping distance, this work proposed a way to define the dynamic time warping distance of the sequential patterns and finally carry out simulation experiments based on the defining the similarities of meta patterns.
With the original data as basis, evaluation of cultivated land quality was carried out in Yidu County with the aid of GIS and the fuzzy matter-element proximity cluster model. The procedure of the evaluation goes:(1)Use the principal component analysis method to determine factors which affecting cultivated land quality;(2) extract correlatographs through vectorization with the aid of ArcGIS, put them...
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