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A double anode magnetron injected gun (MIG) for a terahertz (THz) band cyclotron oscillation tube has been presented in this paper. Through design, simulation and optimization by the particle-in-cell (PIC) code, a double-anode electron gun with trans-velocity spread of 3.19% is obtained, and the ratio of the transverse velocity to the axial velocity is equal to 1.4. The designed electron gun well...
In this paper, three-axis measuring system calibration problems, according to the ideal measurement system projection orthogonal system of thought, through the vector field measurement system to map the relationship between ideal orthogonal system, establish measurement system deviation parameter model; PSO algorithm will introduce self-learning mechanism and thus solve the optimal mapping parameters,...
This paper reports the results about a Magnetron Injection Gun(MIG) designed recently. This gun can work at frequency 94GHz for gyrostron. After lots of optimizings and simulations about the structure, at the coefficient of magnetic field 0.8313(3.5755T), beam voltage 24KV, and beam current 2A, it was observed that the electron ratio 1.4, the maximum transverse velocity spread less than 2.7%, the...
For a expert system, how to improve testing accuracy is a key question. In order to weed out all parameters' blunder error, the expert system used data mining based on genetic algorithm, so According to one parameter's changing we can predict the other parameter's variation trend. This expert system can effectively improve test accuracy of artificial chamber.
Service discovery is critical for mapping logical resource name to physical resources in large-scale distributed systems. The traditional Domain Name System (DNS) deployed on the Internet, however, suffers from slow-down, vulnerability for denial of service attacks, and does not support fast updates. To address these problems, a novel decentralized service discovery approach based on peer-to-peer...
Objective: To discuss the effects of Chrysan them um m orif olium on mRNA expressions of p53 and Bax in the Human Umbilical Vein Cells(HUVEC) under Induction and Cultivation of high glucose. Methods: Make four groups of the HUVEC as normal cells group, normal glucose - only deal cells group high glucose -only deal cells group and Chrysanthemum morifolium + high glucose acting cells group. After 18∼24h,...
Streaming media application has attracted more and more attention nowadays. However, how to improve the quality of service (QoS) for streaming media application is still a challenging issue. The emerging transport protocol - Mul-TCP Friendly Rate Control (MulTFRC), which gives different priorities to data flows, could be used in streaming applications or similar use cases. On our test bed, some streaming...
The congestion control scheme plays a critical role in the multicast communication. Without a proper congestion control mechanism, multicast protocols would cause unfairness while sharing network bandwidth with other flows. We propose a deliberated congestion control scheme to multicast multimedia contents for smart phones retrieving effectively. Our key idea is to detect the single trip time of packet...
Nostoc flagelliforme, which grows in arid or semiarid steppes of the west and westnorthern parts of China, has a potential application in the ecological restoration of the damaged ecosystem in there. The reducing and slowly grown material is potentially the main limiting factor for the scale-up cultivation and application of it. In this paper, to prepare as many short vegetative filaments as possible...
It has been widely recognized that the multipath routing can be fundamentally more efficient than the traditional approach of routing along single path. A self-adaptive traffic splitting algorithm, called Dynamic Weighted Round-Robin (DWRR), has been developed to distribute traffic fairly in term of the weight so as to obtain good performance of network load balance. In addition, DWRR can get lower...
In the risk investment system, whether the double principal-agent relationship which is formed by different interest subjects can smoothly operate is the key to determine the success of risk investment, yet the issue of information asymmetry in the field is more serious than other industry, so that double principal-agent relationship formed in it exists huge risks. A series of binding agreements and...
The core of modern enterprise management systems is ameliorating corporate governance structure, good corporate governance structure is the fundamental element of improving efficiency of business management. Scientific and effective internal control system is a strong guarantee to achieving its goal. Internal control system made by management layer as a series of established rules, policies and procedures,...
The Balanced Score card as a performance-art management theory and strategic management tool, have been widely disseminated since its theory and practice in the world. It provides a comprehensive evaluation system, mainly by measuring the four fundamental aspects of business to the enterprise at all levels of staff to convey the company's strategies, as well as each step in their mission. In this...
With the development of the market economy and the richness of the accounting content, audit plays an increasing important role in exposing the economic data errors and fraud and safe guarding market order. But owing to the objective existence of operating risk and limitation of audit technique, audit risk is inevitable to some extent. In this paper, fuzzy comprehensive evaluation model and the combination...
A fuzzy multi-criteria model and an open storage network model about forest lookout station has been established in Baiyun District of Guangzhou City China. The correlative theory is fuzzy programming & stochastic programming. In order to have the optimum result for a priority, the genetic algorithm has been used.
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