Qingdong Wang

Southwest Jiaotong University

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Gepu Guo

Nanjing Normal University

Juan Tu

Nanjing University

Qingyu Ma

Nanjing Normal University

Guanghua Wang

Wuhan University of Science and Technology

Yuzhi Li

Zhejiang Normal University

Dong Zhang

Nanjing University

Hongyan Chu

Nanjing Normal University

Jianfeng Wei

Northwestern Polytechnical University

Yingbin Zhang

Southwest Jiaotong University

Haiying Fu

Southwest Jiaotong University

Cooperative Institutions

Southwest Jiaotong University

Chinese Academy of Sciences

Wuhan University of Science and Technology

Beihang University

Shandong University

Tianjin University

Huazhong University of Science and Technology

Hebei University of Engineering

Northwestern Polytechnical University

Central South University

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A Kind of New Approach for IVFS(II)

Journal of Shangqiu Vocational and Technical College (2005)

Qingdong Wang

They are given that two of nested sets for IVFS,and their basic properties are discussed.Based on this respresentation theorem of IVFS are built ,thus theorems are approached.

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A kind of approach to new basic theory for IVFS

Journal of Shangqiu Teachers College (2005)

Qingdong Wang

The concept of [a_1,a_2]-upper cutsets for IVFS,and their basic properties are discussed.Based on this,a number of decomposition theorems for IVFS are established,thus approach to a new IVFS theorms.

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Online Monitoring System Design ofMulti-rope Friction Hoist Load

Qingdong Wang Shenghai Wang Jianfeng Wei

Mine hoist is responsible for important tasks such as upgrading coal and gangue, lowering materials, lifting personnel and equipment. With increasing of mine depth and lifting capacity, multi-rope friction hoist becomes a key lifting equipment in major coal mines of China due to its advantages of small size, low weight, great lifting capacity, safe performance, suitable for deep well, etc.. As a large-scale mechanical electronic equipment in mining industry, mine hoist is one of the four large equipments for coal mining, known as throat of mine. The safe operation of mine hoist has a direct influence on the safety of mine production: hoist overload occurs occasionally as a result of the lack of detection measures, which greatly threatens safety of production, The design realizes the diagnosis and alarm of faults such as overload, unloading of coal transfinite, pot-sticking and imbalanced tension, and disconnect the security loop when necessary thus to avoid incidents. Index Terms-load, online monitoring, multi-rope friction hoist

Hoist (device)

Lifting equipment

Wire Rope

Gangue

Counterweight

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Investigation of particle effects on bubble coalescence in slurry with a chimera MP-PIC and VOF coupled method

Chemical Engineering Science (2022)

Yixiang Liao Qingdong Wang Utkan Çalışkan Sanja Mišković

Coalescence (physics)

10.1016/j.ces.2022.118174

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Mine elevator comprehensive performance testing system based on virtual instrument

Guimei Wang Qingdong Wang Jiangbo Li Jianfeng Wei

Mine elevators are large electromechanical equipment with integration of mechanical, electrical and hydraulic parts, bearing the task of carrying material, equipment and personnel between ground and below ground levels. The mine elevator is the spine of the underground mining industry. At present, a great deal of elevating equipment on active service in China has not yet reached its life expectancy, and considering the cost, they can not be replaced wholesale. With production on the rise, the demands on the safety and reliability of the elevator operation are increased. In order to guarantee a minimum economic input and achieve maximum output, performance parameters should be measured in time to achieve the goal of real-time control. Virtual Instrument technology is a computer-based instruments and measurement technique, which combines computer and instruments, relying on computer hardware and operating system to realize various instrument function through software. "Hardware replaced by software" is the essence of virtual instruments. This paper is directed at the shortcomings of current mine elevator testing, a modern testing system based on virtual instrument software Lab VIEW has been established, which completes elevator performance test in the "Coal Mine Safety Regulations". Various signal processing methods are conveniently applied during testing. Compared with a traditional system, the new system improves the accuracy of test results, test efficiency, eases labour intensity, has good scalability and openness, and will have great application value and development prospects.

Elevator

10.1109/iciea.2008.4582671

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Assessment of sulfate attack and freeze–thaw cycle damage of cement-based materials by a nonlinear acoustic technique

Materials and Structures (2016)

Jun Chen Rendy Bharata Tingyuan Yin Qingdong Wang Hao Wang

10.1617/s11527-016-0949-7

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A Study on the Roughness with Extra Fine Sediment in Open Channel

Changjun Zhu Qingdong Wang

In view of the abnormal phenomenon that a flood peak increased in August 2004 and July 2005 along the lower Yellow River, the mechanism of this abnormal phenomenon is studied. It is found that the flood increase was due to the decrease the channel roughness in the propagation of high concentrated flood carrying the extra fine sediment which was discharged from Xiaolangdi reservoir. Then the experiment with extra fine sediment flowing smooth, roughness beds was studied. Based on the comparison between the distributions of velocity and the analysis of resistance in the experiment, the results show that resistance of flow may be considerably reduced by the extra fine sediment if the flow boundary is rough. It has the significant value for the flood control and flood prediction.

Hydraulic roughness

Flow resistance

10.1109/icim.2009.37

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Effect of metal salts on the decomposition characteristics of Mengdong lignite

Energy Sources Part A Recovery Utilization and Environmental Effects (2019)

Guanghua Wang Zhiyong Ma Qingdong Wang

In this study, the apparent activation energy of coal samples during pyrolysis with NiCl2, FeCl3, Ni(NO3)2 and Fe(NO3)3 in-situ loaded on was calculated. The results show that metal salts promote the devolatilization process with the activation energy decreased by 24.28%, 13.27%, 38.61%, and 41.53%, corresponding to NiCl2, FeCl3, Ni(NO3)2 and Fe(NO3)3 respectively. And the catalytic effect on the evolution of H2 and CH4 was also studied via TG-MS test. Except Fe(NO3)3, the adding of other metal salts made activation energy of CH4 and H2 descend. NiCl2-coal sample has the least activation energy of CH4, which indicates a closer interaction with coal matrix compared with Ni(NO3)2. However, the activation energy of H2 for NiCl2-coal sample and Ni(NO3)2-coal sample varies little. To further investigate the catalytic effect during pyrolysis, hydrogen distribution in solid residues was analyzed according to the FTIR spectrums. The relatively abundant hydrogen content in aromatic structure when ferric salts were added indicates the hydrogen transfer to aromatic rings under the effect of Fe element. And FeCl3 has a superior effect compared with Fe(NO3)3. The difference in the catalytic effect between metal nitrates and metal chlorides could be ascribed to the different behaviors during the decomposition process.

10.1080/15567036.2019.1587071

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Production of Hydrogen‐Rich Syngas from Lignite using Different Pyrolysis Methods

Energy Technology (2016)

Qingdong Wang Guanghua Wang Wenbing Li Biao Chen

Abstract The efficiency of hydrogen production by the pyrolysis of lignite from Dongsheng in Inner Mongolia was investigated. Three pyrolysis methods, namely, temperature‐programmed pyrolysis, isothermal pyrolysis, and microwave pyrolysis, were applied and compared. The online analysis of the composition of the pyrolysis gas showed the effects of the different pyrolysis methods on the gas composition and the yield of hydrogen. The reasons were discussed on the basis of infrared thermography of the semicoke samples, FTIR spectroscopy, and SEM analysis. The microwave pyrolysis was improved by the addition of a shimming device to the furnace chamber. Consequently, the efficiency of hydrogen production by the pyrolysis of lignite was increased substantially, and the yield of hydrogen surged by 430 % compared with the yield for the original microwave pyrolysis.

Isothermal process

10.1002/ente.201500479

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On the Reform of Competitive Public Utilities’ Entrusting Relation

Journal of University of Science and Technology Beijing (2005)

Qingdong Wang

Based on an examination of the regulation policy, basic theories of entrusting relation and the reform practice of western countries’ competitive public utilities, this paper put forward a suggestion that entrusting relation will be an important way for our country’s competitive public reform.

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