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Impurity Behaviors under Wall Conditioning in HL-2A
Zhengying Cui,Chenghe Cui,Mingxu Wang,Ping Sun,Quanming Wang,Wei Li,Yudong Pan,Zeng Cao 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
Impurities are one of the key issues of tokamak plasma research, as they are directly related to plasma quality and steady-state operation. The HL-2A device with two close divertor is the first divertor tokamak in China. It was successfully constructed in 2002 and has been operated for three 3 years up to now. In the 2004 campaign, siliconization as a wall conditioning was first done on the HL-2A tokamak by using glow discharge cleaning (GDC) with a gas mixture of SiH4 + He. The effects of siliconization on impurities and recycling are investigated, as well as the lifetime of siliconization, in this paper. The intensity of oxygen line is remarkably decreased after siliconization. Radiation of silicon line rapidly decreases shot by shot just after siliconization, but the effect of siliconization on the plasma properties is present all along and decreases gradually for a large amount of discharges. The effect of the siliconization can be maintained to about 180 discharges with similar discharge parameters.
钱,正英(Zhengying Qian) 세계문화관광학회 2012 International Journal of Culture and tourism Resea Vol.5 No.2
随着国民经济的发展, 人民生活水平日益提高, 旅游已经逐渐成为人们生活的一部分, 旅行社作为人们旅游生活的重要依托载体, 其服务和管理质量对于人们的旅游生活具有重要的影响。本文主要从三个方面对课题展开讨论,首先研究a旅行社质量管理的内容, 从硬件管理和软件管理两个层次综合进行a探讨, 随后在此基础上探讨a旅行社质量管理体系的建立, 从四个方面分析a其建立的过程,最后围绕着旅行社质量管理的方法等问题开展多方面探讨。本文主要从理论分析入手, 通过系统的研究和分析为 旅行社质量管理方面的研究提供参考, 同时为消费者选择旅行社提供有效的质量判断依据。 With the development of the national economy, improve people’s living standards, tourism has gradually become a part of people’s life, travel as people travel is important rely on carrier, its service and management quality for people’s life has an important influence on tourism. This article mainly from the three aspects of the topic spreads out discuss, first studied the travel service quality management content, from the hardware management and software management combination of two levels is discussed, then on the basis of the travel agency establishing quality management system, from the four aspects of the process, the last around travel cooperative quality management approach to such problems in many aspects. In this paper, starting from theoretical analysis, through a systematic study and analysis for the travel service quality management to provide some reference to the study, at the same time as the consumers’ choice of a travel agency to provide efficient quality judgment.
A Queuing based Network I/O Scheduling with QoS Guarantee for Virtual Machine
Xiaodong Liu,Zhengying Wen,Miao Wang 보안공학연구지원센터 2015 International Journal of Future Generation Communi Vol.8 No.6
Since multiple VMs share the same network interface card (NIC). The I/O operation of one virtual machine is affected by others. The quality of service (QoS) of the network is hardly guaranteed. This paper presents a queuing based I/O scheduling for big data processing via the cloud, an efficient scheduling strategy with quality of service (QoS) guarantee. Our proposed scheme uses a queuing system to control the I/O bandwidth and provide QoS guarantee for each application. The proposed techniques are implemented on the xen virtual machine monitor (VMM) and evaluated with micro-benchmarks on Linux operation system.
Experimental analysis of component morphology by fused coating process
Guangxi Zhao,Zhengying Wei,Jun Du,Yunfei Yao,Wei Liu,Xin Wang 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.6
Fused coating process is a novel method for additive manufacturing technology, which has greatly reduced the cost and improved the efficiency. A series of experiments were carried out with the orthogonal method using pass width and height to evaluate. The order of factors influence degree on width and height were figured out, and it’s found that the air pressure at the top of the nozzle is the most influential. The morphologies of single passes at different temperatures were measured and fitted separately with parabola, circular arc and cosine function, and the goodness of fit was compared and analyzed, based on which the overlapping models were investigated. Four kinds of overlapping patterns were mentioned for the single-layer multi-pass model. The relationship between central distance of adjacent layers and overlapping patterns was calculated out. Furthermore, experimental pieces with suspended structure were processed without supporting material. It is found that when the tilt angle is smaller than 40° the inclined thin wall will collapse.
Finite-control-set model predictive control for magnetically coupled wireless power transfer systems
Qi, Chen,Lang, Zhengying,Li, Tao,Chen, Xiyou The Korean Institute of Power Electronics 2021 JOURNAL OF POWER ELECTRONICS Vol.21 No.7
Output voltage control is an important subject in magnetically coupled wireless power transfer (MC-WPT) applications. Conventional control methods for MC-WPT systems use the PI controller. However, this method suffers from three issues: time-consuming tuning work of the PI parameters, increased control complexity due to the needs of the modulator, and poor dynamic performance. To provide an attractive alternative to the PI controller, a novel output voltage regulation method based on finite-control-set model predictive control (FCS-MPC) has been proposed for a MC-WPT system. The proposed method has inherent advantages such as a very intuitive concept, no need for a modulator, and fast dynamic response. Moreover, it can achieve soft switching by constructing pulse-density-modulation-based voltage pulse sequences as the control set. The design and implementation of the proposed controller are discussed in this paper. The proposed control method has been tested on a series-series-compensated MC-WPT system, and experimental results demonstrate the effectiveness of the proposed control method in comparison with PI control methods.
Geng Qi,Wei Zhengying,He Fei,Meng Hao 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.5
To overcome the drawbacks of the large flat-face TBM cutter head (for example, enormous rock cutting forces and eccentric forcescause excessive deformation of the cutter head and damage to the main bearing), a two-stage cutter head is introduced. The two-stagecutter head was designed using grey relational analysis method according to the flat-face cutter head applied in the West Qinling Tunnel,China. The mechanical performance analysis models of the two cutter heads in the layered-banded rock (LBR) mixed ground were builtto calculate the cutter heads’ rock cutting thrust and torque, eccentric forces and overturning moments. The two cutter heads’ deformationand stress distribution were also compared. We concluded that with the same penetration, the thrust, torque, eccentric force, overturningmoment, deformation and maximum stress of the two-stage cutter head were smaller than those of the flat-face cutter head.
김승일(KimSeung-Il),정영주(ZhengYing-Zhu) 한국체육학회 2005 한국체육학회지 Vol.44 No.3
The study tried to newly light up the tradition of the art constitution in a socialist state, analyze korean race dancing of China in the art-historical flow and find out the characteristics of modern art history by examining the formation, developmental process and their works of the korean race dancing of China.First, the formative period was from the time migrated Koreans to 1949. The flow and the propagation of the civil-folk dancing was developed actively in this periods. The dancing of theater art was developed by dancing art of korean race in China and the dancing of stage art was developed by stage art, which was the civil-folk dancing of the korean race.Second, the developmental period of the korean race dancing in China was from 1949 to 1980. Examining the flow and the change in the developmental period, this art was developed not only as keeping pace with the great flow of the socialist revolution and the establishment of China in a dancing cultural sphere but also as having a characteristic of the korean race of china, based on the traditional culture of their race. Therefore this is the period that the artistic dancing of the korea race leads to its own developmental course.Third, the peak period of the korean race dancing in China was from 1980 to the present. As the exchange of dancing was frequent in the inside and outside in this period, the acceptable work of the foreign dancing was progressed actively and the developmental area of the korean race dancing culture was established largely.Accordingly, the professional dancing theory and comments were developed deeply and broadly, and harmonized quantitatively as well as qualitatively in this period. Therefore the formation and contents of the work was understood concretely throughout understanding the historical flow of the korean race dancing of in China and the development of the dancing and the study could play an important role to understand an artistic aspect widely.
Geng Qi,Wei Zhengying,Meng Hao 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.11
A two-stage tunnel boring machine (TBM) cutterhead with a pilot-enlargement boring method was presented to reduce the risk of rockbursts resulting from boring with a TBM with a large flat-face cutterhead. A reduced scale similarity experiment was designed on rocktunnel boring to determine the boring diameters of the two stages, and numerical simulation models were built. A micron X-ray computerizedtomography system was adopted to examine the failure area of the excavated testing piece and validate the numerical models. Stress distribution and energy release rate (ERR) were used in the numerical simulations to evaluate the rock burst risk of the boringprocess. Experimental and numerical results show that rock burst is prone to occur in the upper, lower, and side areas of the surroundingrock around the tunnel, and risk increases with the lateral pressure coefficient and boring diameter. The optimal boring diameter ratio ofstages 1 to 2 was determined between 0.55 and 0.59. Meanwhile, the ERR of the designed two-stage cutterhead is approximately 60%smaller than that of the flat-face cutterhead.
Geng Qi,Wei Zhengying,Meng Hao,Chen Qiao 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.4
A common drawback presented by several numerical rock-breaking studies was that the rocks beneath disc cutters were cut off excessively while the rocks between disc cutters remained, which usually resulted in a smaller cutter spacing than the proper value. To overcome this limitation, the constitutive equations of different rock parts were defined separately using VUMAT, an ABAQUS-based material subroutine. The constitutive model of rock was an application of the Drucker-Prager yield criterion coupled with the Lemaitre damage model. Full-scale rock-breaking tests on a rotary cutting machine were conducted, and 25 groups of orthogonal numerical simulations were carried out. By comparing the normal force, rolling force, and specific energy of numerical results with those of experimental results, the optimal values of the defined parameters D c1 , k, and B were determined to be 9 ☓ 10 -4 , 0.1 and 0.8, respectively. With the presented numerical method and the determined parameters, the influences of cutter spacing on normal force, rolling force, and specific energy were studied. Both the normal and rolling forces of the first cutting generally remained constant, whereas the forces of the second cutting generally increased linearly with the cutter spacing. The optimal cutter spacing for the studied rock type (Hard sand rock collected from West Qinling tunnel) was approximately 72 mm, which was in accordance with the cutter spacing of the tunnel boring machine applied in this tunnel project.
Wang Xin,Du Jun,Wei Zhengying,Zhang Shan,Zhao Guangxi,Ren Chuanqi,Bai Hao 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.2
In order to achieve good interlayer metallurgical bonding in the metal fused-coating additive manufacturing, the finite element thermal analysis model was established and the influences of different heating temperatures of fused coating nozzle and substrate on the interlayer remelting was analyzed. The maximum remelting depth under different temperature conditions was obtained. The multi-layer forming experiments were performed under different temperature conditions, and the results showed that increasing the heating temperature of nozzle or substrate will effectively increase the remelting depth, that the surface forming quality is better when the remelting depth is in the range of 0.1~0.2 mm, and that the deviation between the remelting depth and the calculated value is less than 15 %. So, the model can predict the remelting depth of the intermetallic microstructure.