Qing Wang

Research Institute of Petroleum Exploration and Development

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Design of a dynamic load balancing model for multiprocessor systems

Wentao Wang Xiaozhong Geng Qing Wang

Dynamic load balancing is an important factor affecting the parallel computing performance in a multiprocessor system. On the basis of an introduction to the basic principle of dynamic load balancing algorithm, this paper first finds through analysis that the basic reason for overhead occurring in load balancing is the load migration, and then qualitatively gives the granularity formula of moving load each time, proposes a new dynamic load balancing algorithm, defines the four possible states of the node, and discusses the implementation rule of the algorithm. Finally, a comparison is made between the operating results of the algorithm and those of other load balancing algorithms and no load balancing through experiment, showing that the load balancing algorithm is better than other algorithms in case of the node with no-load, different loads, and different data scale.

Granularity

Dynamic load testing

Load management

Round-robin DNS

10.1109/iccsn.2011.6014808

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Citations (4)

Quenched-in liquid in glass

Materials Futures (2023)

Qing Wang Yinghui Shang Yong Yang

Abstract Glasses have long been considered as frozen liquids because of the similarity between their static amorphous structures. While the modern theories about glass transition suggest that glass transition may result from supercooling of a heterogeneous liquid that contains fast and slow regions, it remains unclear whether such a physical picture applies to metallic glasses, which are a densely packed solid glass that was once believed to be a vitrified homogeneous metallic liquid. However, in the recent work published in Nature Materials , Chang et al provide compelling evidence to show that metallic glasses contain liquid-like atoms that behave as a high-temperature liquid in stress relaxation. Being activated under cyclic loading, this quenched-in liquid results in a fast relaxation process, which is discovered in a variety of metallic glasses. Their results are important and deliver a strong message that metallic glasses have a dynamic microstructure containing liquid- and solid-like atoms. Most importantly, the outcome of their research provides physical insight into the nature of glass-transition in metallic glasses, and also helps unravel their structure-property relations.

Supercooling

10.1088/2752-5724/acb8cf

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Citations (8)

Laser defined and driven bio-inspired soft robots toward complex motion control

Physical Chemistry Chemical Physics (2023)

Monan Liu Qing Wang Yunfei Li Hong‐Bo Sun

The design and actuation of soft robots are targeted at extreme motion control as well as high functionalization.

Soft Robotics

Soft materials

10.1039/d2cp05487f

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Citations (5)

Synergistic utilization of industrial waste red mud and rice husk ash for eco-friendly geopolymer preparation: enhancing strength and mitigating hazardous leaching

Environmental Science and Pollution Research (2023)

Lisheng Guo Xin Xu Qing Wang Xiaoqiang Dong Xiaofeng Liu

Husk

Environmentally Friendly

Red Mud

Industrial waste

10.1007/s11356-023-31336-4

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Citations (5)

Structural relaxation and crystalization of bulk metallic glasses Zr41.2-Ti13.8-Cu12.5-Ni10-xBe22.5Fex studied by mechanical spetroscopy

HAL (Le Centre pour la Communication Scientifique Directe) (2004)

Qing Wang Jean-Marc Pelletier Y.D. Dong Y.F. Ji

Bulk Metallic Glasses

Nanocrystallization

Glass Forming Ability

Metal Nanoparticles

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Preparation and Electrochemical Properties of Yttrium-Doped Lifepo4/C Cathode Material Using Acid-Washed Iron Red for Lithium-Ion Batteries

SSRN Electronic Journal (2022)

Jiachen Wang Shaohua Luo Zhuoran Zhang Kexing Cai Pengwei Li

In this paper, using citric acid as the carbon source and pickling iron red as the iron source, pure LiFePO 4 and LiFe 1-x Y x PO 4 /C materials were prepared by the carbothermic reduction method. The morphology and electrochemical properties of several doping samples are investigated by several testing and characterization methods. The test results show that a certain amount of yttrium doping yttrium doping could change the particle size of LiFePO 4 /C and reduce the resistivity of materials, thereby improving the cycle rate performance of LiFePO 4 /C. Yet if the amount of doping is too large, yttrium can not fully enter the LiFePO 4 lattice, and some of them exist in the form of YPO 4 . Among them, the discharge specific capacity of LiFe 0.98 Y 0.02 PO 4 /C composite is the highest at 0.5C, which is 148.90 mAh g -1 . And it exhibits outstanding electrochemical performance. This may be because it is uniformly distributed and the grain size is relatively small.Â To sum up, this method of strengthening the properties of LiFePO 4 materials by adding a certain amount of yttrium is feasible .

10.2139/ssrn.4044398

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Design of an Ultra-Short Pulse Generator

Qing Wang Xiaojian Tian Jiang-dong SHAN Ge Wu

An ultra-short pulse generator is presented, whose frequency, pulse width and amplitude are tunable. The design method is based on Marx circuit, which is made up of avalanche transistors mainly. The paper describes the avalanche transistor's characteristic, the basic pulse circuit, the generator's working principle and the selection of components in detail. Finally, the simulation and experimental results are shown and they are in accordance with each other perfectly. With the features such as simple structure, stable and reliable performance and low cost, the ultra-short pulse generator can be applied in ultra-wideband wireless communication system.

Marx Generator

Wideband

10.1109/wicom.2009.5305839

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Citations (1)

Online Monitoring Technology of Metal Powder Bed Fusion Processes: A Review

Materials (2022)

Zhuo-Jun Hou Qing Wang Chenguang Zhao Jun Zheng Jumei Tian

Metal powder bed fusion (PBF) is an advanced metal additive manufacturing (AM) technology. Compared with traditional manufacturing techniques, PBF has a higher degree of design freedom. Currently, although PBF has received extensive attention in fields with high–quality standards such as aerospace and automotive, there are some disadvantages, namely poor process quality and insufficient stability, which make it difficult to apply the technology to the manufacture of critical components. In order to surmount these limitations, it is necessary to monitor the process. Online monitoring technology can detect defects in time and provide certain feedback control, so it can greatly enhance the stability of the process, thereby ensuring its quality of the process. This paper presents the current status of online monitoring technology of the metal PBF process from the aspects of powder recoating monitoring, powder bed inspection, building process monitoring, and melt layer detection. Some of the current limitations and future trends are then highlighted. The combination of these four–part monitoring methods can make the quality of PBF parts highly assured. We unanimously believe that this article can be helpful for future research on PBF process monitoring.

Sensor Fusion

10.3390/ma15217598

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Citations (15)

Discussion on the teaching method of science of engineering rock and roil

Journal of Architectural Education in Institutions of Higher Learning (2010)

Qing Wang

The science of engineering rock and soil is one of the basic special courses of civil engineering major,and plays an important role in the education system of correlation field.Students can make a stable transition from basic course to special one and show great interesting in their academic study through the learning about this course.The cultivation of study interesting and the improvement of teaching method are analyzed on the basis of the course features which are strong theoretical and practical,combining with years of teaching experiences.And then the teaching method is discussed from the aspects of teaching content,teaching ways and practical education,to improve the teaching progress and quality.

Course (navigation)

Science and engineering

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Effective Field Theory

Qing Wang

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Citations (2)