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A scheme of mode conversion is proposed based on mode coupling in a hybrid dual-core photonic crystal fiber, which contains an index-guided core and a photonic bandgap core. The first circle holes around one of the cores are replaced with high-index rods. Efficient mode conversions can be achieved numerically by optimizing the index of these high-index rods. Moreover, the operating wavelength can...
In order to analyze the influence degree between after-sales service quality and usage quality of aviation equipment, a method based on wavelet neural network (WNN) is proposed that support the equipment supplier to determine the key workflow and factors. Supplier workflow index-equipment usage quality relation function was established, and the overall effectiveness was defined. MATLAB was used for...
Estate industry plays many efforts on economics' development. For investigating impact factors about estate companies' operating performance and finding the breakthrough to improve operational capacity, this paper constructed the evaluation model based on principal component analysis and adopted 40 estate listed companies as example to verify the model. The results indicated that the model, proposed...
Cracks appear on natural soil surface due to wetting drying cycles, shearing or other causes. The existence of crack has most important effect on the properties of soil. The crack of the soil has attracted much attention. The description of cracks' geometry is the fundamental work for investigating the cracked soil. It is common to use the cracked rate, fractal dimensions and gray level entropy to...
A cloud-based, highly consumable queuing service must provide extreme scalability, flexible models of consistency, and high availability in the presence of network partitions. CAP theorem states that at most two of the three properties - Consistency, Availability, and Partition Tolerance - can be achieved at the same time for any shared data system. This paper presents the design and implementation...
Given that the urban area is a complex ecosystem consisted of natural, societal and economic entities, urban ecosystem health evaluation is necessary for the scientific decision-making and proper ecological restoration. In this paper, the framework and methodology of urban ecosystem health evaluation based on emergy are proposed. The system of indices is developed including vigor, structure, resilience,...
Correct evaluation water resources sustainability of a city or an area is one of the most important way to understand the development potential of it. The paper introduced the concept of social adaptive ability, established a social index system and evaluation method of water resources scarcity, and took Tianjin as a case to evaluate water resources sustainability of it from 1998 to 2006. The results...
The first step of total water pollutants control is regional allocation. It is a key problem to settle water pollutants regional allocation on the principle of equity. According to different principles of equity, the indexes were chose to reflect these principles based on economic and nature environmental factors. The information entropy was used for reference. Entropy method was used to get weight...
In this paper, the objective was to investigate the heart rate variability in two selected groups of premature infants (sepsis vs non-sepsis). We studied the RR interval series not only by linear methods - time domain and frequency domain, but also by non-linear methods - chaos theory and information theory, in order to find the optimal parameters to distinguish sepsis premature infants from non-sepsis...
This paper uses regional saturation and speed as evaluation index, uses one of the traffic control region as research object, VISSIM as the test platform. Operation effect of different traffic control strategies under different traffic situations are simulated, so as to select the optimum traffic control strategy for corresponding traffic situation. Meanwhile, this paper proposes an adaptive traffic...
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