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Chinese cities are now at a stage of rapid development and the problems of transportation, environment and land use are increasingly serious. Urban rapid rail transit is wholly a convenient, fast, effective, low-carbon, environment-friendly urban infrastructure system, which providing an effective way for the sustainable development of urban transit and land use. In this paper, the effect mechanism...
With the increasing scale of modern enterprises, the accounts receivable are more and more important, so how better to manage the bad debt of the accounts receivable has become a focus of attention. In this paper, the advantages and disadvantages of various accounts receivable bad debts management practices, such as percentage of accounts receivable balances, aging analysis, the percentage of sales...
An improved threshold-based version storage model is proposed to solve the version storage problem in rapid response collaborative design in network environment. Directed acyclic polychromatic graph is adopted to express version management model, the threshold calculation formula of node in graph model and critical threshold estimation formula of node storage are given, and the process of algorithm...
Bundled double-walled and multi-walled carbon nanotubes (DWNT and MWNT) are effectively dispersed under a long-time sonication in the presence of polystyrene (PS) and poly(vinyl alcohol) (PVA), by the means of non-covalent functionalization. FTIR and Raman reveals an interactions between CNTs and polymers, and the helical wrapping is clearly observed by HRTEM. By dint of template with nanopores and...
In order to miniaturize irradiation accelerator, a new microwave-absorbing structure - collinear load, instead of traditional waveguide load, is adopted to absorb remnant microwave power. Collinear load depends on the film conglutinated on walls of accelerating cavities by flame spraying process and so on. To research on the properties of the alloy thermal-spraying coating, homogenization theory and...
Aiming at energy saving, efficient and low-cost, an approach of optimal design of a cooling system with compact structure for an 8 MeV-10 MeV irradiation accelerator is presented. A jacket-type cooling structure with a single-inlet helix water channel is chosen and minimum water flow, pressure and optimum inlet temperature are determined. As the result, a temperature distribution less than plusmn...
The power systems become more and more complex for the tendency to be interconnected and large scale. It is very important to detect symptom in the early of large scale blackouts and take necessary precaution measures. The analysis and control of complicated systems can not be completely solved by only mathematic tools or knowledge-based method for the reason that power systems are typical hybrid...
In this paper, we report the first investigation of the influence of uniaxial tensile strain on the gate tunneling current in advanced partially-depleted silicon-on-insulator (PD-SOI) MOSFETs. We have also studied, for the first time, the impact of uniaxial strain on the static leakage current of ring oscillators (RO) fabricated in this technology
Small robots can be beneficial to important applications such as civilian search and rescue and military surveillance, but their limited resources constrain their functionality and performance. To address this, a reconfigurable technique based on field-programmable gate arrays (FPGAs) may be applied, which has the potential for greater functionality and higher performance, but with smaller volume...
This paper studies the degradation of anonymity in a flow-based wireless mix network under flow marking attacks, in which an adversary embeds a recognizable pattern of marks into wireless traffic flows by electromagnetic interference. We find that traditional mix technologies are not effective in defeating flow marking attacks, and it may take an adversary only a few seconds to recognize the communication...
High-dimensional feature space affects the quality and efficiency of text categorization. This paper investigates an improved genetic algorithm that how to help select relevant features in text classification. We follow the so-called "region growing" method to initialize the population, and uses k-means algorithm to selection operation to control the scope of the search, ensure the validity...
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