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CAVITATION CHARACTERISTICS OF HIGH VELOCITY FLOW WITH AND WITHOUT AERATION ON THE ORDER OF 50m/s

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Journal of Hydrodynamics 2007年第4期19卷 429-433页

作者： dong zhi-yong chen Lei JU Wen-jie School of Civil Engineering and Architecture Zhejiang University of Technology Hangzhou 310032 China

Experimental study of cavitation characteristics with and without aeration was conducted at the flow velocity 50m/s in the non-circulating type water tunnel in the Hydraulics Laboratory at Zhejiang University of Technology. Variations of pressure and cavitation number with air concentration, pressure waveforms as well as cavitation erosion level of concrete specimen with and without aeration were obtained. The effects of cavitation control by aeration were analyzed.

关键词： cavitation erosion aeration pressure change cavitation number the order of 50 m/s

Determination of zidovudine using anion exchange chromatography with integrated pulsed amperometric detection

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Chinese Chemical Letters 2012年第6期23卷 715-718页

作者： Yu chen Yu Xiu Liu zhi dong chen Mei Lan chen Yan Zhu Hangzhou Vocational and Technical College Hangzhou 310018 China School of Chemistry and Chemical Engineering Changzhou University Changzhou 213164 China College of Biology and Envinonment Engineering. Zhejiang Shuren University l-langzhou 310015 China Department of Chemistry Zhejiang University Hangzhou 310028 China

A rapid and practical method for direct detection of zidovudine in high performance anion exchange chromatography （HPAEC） has been developed with integrated pulsed amperometric detection （IPAD）. Dionex AS18 （250mm × 2mm） and AG18 （50 mm× 2 mm） columns and 11 mmol/L NaOH solution were used for separation. Multi-step potential waveform parameters were optimized to maximize the signal-to-noise ratio （S/N）. Utilizing an optimized waveform, the repeatability （intra-day） precision and intermediate （inter-day） precision are obtained with relative standard deviation （RSD） of 1.88, 2.27, respectively. The limit of quantification （LOQ） and limit of detection （LOD） were found to be 9.70, 3.0 ng/mL, respectively, with correlation coefficients of 0.9992 over concentration range 0.01-10 μg/mL. The present method was successfully applied to the determination of zidovudine in human plasma. The recoveries of plasma sample spiked by 0.7 μg/mL, 2.7 μg/mL obtained were 95.3-101.5%, with relative standard deviation （RSD） of 2.54%, 2.21%, respectively.

关键词： Zidovudine AIDS Integrated pulsed amperometry High performance anion exchange chromatography Plasma

Determination of lisinopril using anion exchange chromatography with integrated pulsed amperometric detection

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Chinese Chemical Letters 2012年第3期23卷 335-338页

作者： Yu Xiu Liu Dan Shou Mei Lan chen zhi dong chen Pei Min Zhang Yan Zhu School of Chemistry and Chemical Engineering Changzhou UniversityChangzhou 213164China Zhe Jiang Academy of Traditional Chinese Medicine Hangzhou 310007China College of Biology and Environment Engineering Zhejiang Shuren UniversityHangzhou 310015China Department of Chemistry Xixi CampusZhejiang UniversityHangzhou 310028China

A rapid and practical method for direct detection of lisinopril in anion exchange chromatography（AEC） has been developed with integrated pulsed amperometric detection（IPAD）.Dionex AS 18（250 mm×2 mm） and AG 18（50 mm×2 mm） columns and 40 mmol/L NaOH solution were used for ***-step potential waveform parameters were optimized to maximize the signal-to-noise ratio（S/N）.Utilizing the optimized waveform,the repeatability（intra-day） precision and intermediate（inter-day） precision were obtained with relative standard deviation（RSD） of 0.74,0.93,*** limit of quantification（LOQ） and limit of detection（LOD） were found to be 0.37,0.12ng/mL,respectively,with the correlation coefficient of 0.9998 over concentration range 0.01-1μg/*** present method was successfully applied to the determination of lisinopril in human *** recoveries of plasma sample spiked by 0.2μg/mL,0.8μg/mL lisinopril were 98.31-103.23%with RSD of 1.41%, 0.61%,respectively.

关键词： Lisinopril Integrated pulsed amperometry Anion exchange chromatography Angiotensin converting enzyme inhibitor Plasma

Next Generation Network: IP-Based Broadband Infrastructures

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Wuhan University Journal of Natural Sciences 2000年第2期5卷 207-209页

作者： WU zhi bin, ZHENG dong,chen Su zhen College of Electronic Information, Wuhan University, Wuhan 430072, China Wuhan University College of Electronic Information Wuhan China (GRID:grid.49470.3e) (ISNI:***)

To meet the great demand of information transfer, an integrated and effective network is most desirable. Firstly, we give an overview of different communication protocols and present that IP over WDM scheme will be the underlying infrastructures of next generation networks. Finally, we propose MPLS as a promising candidate to guarantee on future network platforms.

关键词： IP protocol ATM WDM MPLS

Long-time evolution of charged grains in plasma under harmonic external force and after being withdrawn

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Chinese Physics B 2022年第2期31卷 460-464页

作者： Miao Guan zhi-dong chen Meng-Die Li Zhong-Mao Liu You-Mei Wang Ming-Yang Yu Department of Physics School of ScienceHangzhou Dianzi UniversityHangzhou 310016China College of Engineering Physics CAMDTShenzhen Key Laboratory of Ultraintense Laser and Advanced Material TechnologyShenzhen Technology UniversityShenzhen 518118China Institute for Fusion Theory and Simulation Zhejiang UniversityHangzhou 310007China Theoretical Physics I Ruhr UniversityBochum D-44780Germany

Evolution of the charged grains in a two-dimensional dusty plasma under a spatially harmonic external force,in particular,their long-time behaviors after the force has been withdrawn,is studied by using molecular dynamics *** an external force and a grain–grain interaction force,initially homogeneously distributed grains can reach a quasistationary state in the form of a disk *** the external force is withdrawn,the disk moves initially with its size and shape nearly unchanged until it rapidly stops moving,and eventually the disk grain rotates like a *** time needed to reach the final state increases with the strength of the initial external force increasing.

关键词： dusty plasma external force long-time behavior molecular dynamics(MD)simulation

High-Temperature Mechanical Properties of Shipbuilding Steel BC in Continuous Casting

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Journal of Iron and Steel Research International 2011年第S1期18卷 605-609页

作者： dong zhi-hua,chen Deng-fu,SONG Li-wei,HU Hui,YANG Xing-lei (College of Materials Science and Engineering,Chongqing University,Chongqing 400030,China) Chongqing Univ Coll Mat Sci & Engn Chongqing 400030 Peoples R China

The mechanical property of shipbuilding steel BC has been studied by means of tensile test at various temperatures from 700 ℃ to 1000℃ with theGleeble-1500D thermo-mechanical *** results indicate that the yield strength and tensile strength of steel have an analogous change pattern as temperature decreasing,and the transition in variation rate of strength occurs at 800℃ in both of them;the hot ductility trough of steel BC is a temperature range from 725℃ to 800℃,while the best hot ductility ranges from 875℃ to 1000℃ with the ductility value over 80%.For the sake of understanding the fracture mechanism of the steel,fracture surface and microstructure of the specimens have been examined by scanning electron microscope and metalloscope *** results show that both the second phase particles and the pro-eutectoid ferrite surrounding the austenite boundaries play a significant role to the variation of hot ductility of steel ***,the research is important to the improvement and the further studies on the quality of steel during slab continuous casting process.

关键词： continuous casting slab mechanical property hot ductility microstructure

On efficiency of sand-controlling system along the Tarim Desert Highway in Taklimakan Desert

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Journal of Geographical Sciences 2000年第2期10卷 141-150页

作者： WANG Xun-ming, dong zhi-bao, chen Guang-ting, HAN zhi-wen (Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China)

As the longest desert highway in China. the 447-kin-long Taklimakan Desert Highway which goes across the Taklimakan Desert was fully opened to traffic in 1996~[1]. The sand-controlling system along the Desert Highway enables the Highway itself to operate properly and creates enormous socio-economic benefits. However, due to delivery time pressure, the sand-controlling system was built in a haste. Lack of studies on sand-controlling system brought deficiencies on design and construction of the sand-controlling system. And with the lapse of time, troubles such as sand deposition on the roadbeds and erosion on roadsides came to surface and caused more serious problems for the traffic routes[1.2]. This paper discusses two forms of the sand-controlling system-the upright fence and the send-covered sand barrier, then analyzes the general benefits of the sandcontrolling system along the Desert Highway.

关键词： sand-controlling system, desert highway Taklimakan Desert

Low-temperature chlorination roasting technology for the simultaneous recovery of valuable metals from spent LiCoO_(2)cathode material

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International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 80-91页

作者： Junjie Shi Changle Hou Jingjing dong dong chen Jianzhong Li Key Laboratory for Ecological Metallurgy of Multimetallic Mineral(Ministry of Education) Northeastern UniversityShenyang 110819China School of Metallurgy Northeastern UniversityShenyang 110819China

With the continuous increase in the disposal volume of spent lithium-ion batteries(LIBs),properly recycling spent LIBs has become essential for the advancement of the circular *** study presents a systematic analysis of the chlorination roasting kinetics and proposes a new two-step chlorination roasting process that integrates thermodynamics for the recycling of LIB cathode *** activation energy for the chloride reaction was 88.41 kJ/mol according to thermogravimetric analysis–derivative thermogravimetry data obtained by using model-free,model-fitting,and Z(α)function(αis conversion rate).Results indicated that the reaction was dominated by the first-order(F1)model when the conversion rate was less than or equal to 0.5 and shifted to the second-order(F2)model when the conversion rate exceeded *** conditions were determined by thoroughly investigating the effects of roasting temperature,roasting time,and the mass ratio of NH_(4)Cl to LiCoO_(2).Under the optimal conditions,namely 400℃,20 min,and NH_(4)Cl/LiCoO_(2)mass ratio of 3:1,the leaching efficiency of Li and Co reached 99.43% and 99.05%,*** of the roasted products revealed that valuable metals in LiCoO_(2)transformed into CoCl_(2) and ***,the reaction mechanism was elucidated,providing insights for the establishment of a novel low-temperature chlorination roasting technology based on a crystal structure *** technology can guide the development of LIB recycling processes with low energy consumption,low secondary pollution,high recovery efficiency,and high added value.

关键词： spent lithium-ion battery thermodynamics chlorination roasting kinetics circular economy

Preface to Special Issue on Electronic Electroplating

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电化学 2022年第7期28卷 1-3页

作者： zhi-dong chen Chong Wang Wei He Ming Li School of petrochemical engineering Changzhou UniversityChangzhou 213164JiangsuChina School of Materials and Energy University of Electronic Science and Technology of China School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai200240China

Electroplating is a process using electric current to deposit a layer of metal(s),which is an indispensable technique in the manufacture of integrated circuits and micro-nano electronic *** for modern electronics is much smaller in scale than the ordinary electroplating processes and relies heavily on foreign technique,such as proprietary materials and *** the competition in the field of chip manufacture intensifies,we realize that there is no choice but to become self-sufficient in such technology,including,but not limited to electroplating technology.

关键词： technology. electroplating ordinary