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Particuology 2024年第11期94卷 48-58页

作者： Shiwei wang yuheng wang Rongjie Kong School of Mines and Mechanical Engineering Liupanshui Normal UniversityLiupanshui553004China College of Environmental and Chemical Engineering Dalian UniversityDalian116622China

This study investigates the adverse effects of fine clay minerals on low-rank coal(LRC)*** potential analysis,X-ray photoelectron spectroscopy,flotation experiments,and the particle-bubble attachment index(PBAI)were employed to assess these *** indicate that quartz and chlorite particles are more prevalent in the flotation concentrate than kaolinite and montmorillonite,likely due to their preferential adsorption of flotation collectors,which inhibits the hydrophobicity of the LRC ***,however,exhibits greater adhesion to LRC surfaces due to its positive *** DLVO theoretical analysis reveals that polar surface interaction energy is a primary driving force in coal-mineral interactions and is crucial in overcoming the energy barrier posed by electrostatic double-layer *** impact of clay minerals on LRC flotation is highly dependent on clay type.

关键词： Low-rank coal Quartz Kaolinite Montmorillonite Chlorite Extended DLVO

Comparison of internal force antagonism between redundant cable-driven parallel robots and redundant rigid parallel robots

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Frontiers of Mechanical Engineering 2023年第4期18卷 97-117页

作者： yuheng wang Xiaoqiang TANG State Key Laboratory of Tribology Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China Beijing Key Laboratory of Precision/Ultra-Precision Manufacturing Equipment and Control Tsinghua UniversityBeijing 100084China

The internal force antagonism(IFA)problem is one of the most important issues limiting the applications and popularization of redundant parallel robots in *** cable-driven parallel robots(RCDPRs)and redundant rigid parallel robots(RRPRs)behave very differently in this *** clarify the essence of IFA,this study first analyzes the causes and influencing factors of ***,an evaluation index for IFA is proposed,and its calculating algorithm is ***,three graphical analysis methods based on this index are ***,the performance of RCDPRs and RRPRs in IFA under three configurations are *** show that RRPRs produce IFA in nearly all the areas of the workspace,whereas RCDPRs produce IFA in only some areas of the workspace,and the IFA in RCDPRs is milder than that ***,RCDPRs more fault-tolerant and easier to control and thus more conducive for industrial application and popularization than ***,the proposed analysis methods can be used for the configuration optimization design of RCDPRs.

关键词： cable-driven parallel robots parallel robots redundant robots evaluation index force solution space

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低修复成本的局部混合修复阵列码模型

计算机应用研究 2025年第1期42卷 222-230页

作者：王宇恒熊攀唐聃蔡红亮成都信息工程大学软件工程学院成都610225 四川省信息化应用支撑软件工程技术研究中心成都610225

具有局部修复性质的水平阵列码将编码矩阵进行分区管理,降低磁盘发生故障时需要读取的数据总量并提升修复效率,但仍存在修复时读写负载集中于单个磁盘的问题。针对局部水平阵列码磁盘读写不均和单双盘修复效率有待提升的问题,结合水平... 详细信息

具有局部修复性质的水平阵列码将编码矩阵进行分区管理,降低磁盘发生故障时需要读取的数据总量并提升修复效率,但仍存在修复时读写负载集中于单个磁盘的问题。针对局部水平阵列码磁盘读写不均和单双盘修复效率有待提升的问题,结合水平阵列码和垂直阵列码的特点,对其进行局部冗余改造,提出一种具有局部修复性质的混合式阵列码修复模型——LHRC。LHRC根据垂直阵列码的思想将局部水平阵列码的对角校验列迁移至矩阵的中间行,加深数据块与校验块之间的联系,分散读写负载至其他磁盘并减少参与修复的数据总量。通过理论分析,LHRC具有良好的编译码复杂度,改善了磁盘修复时读写不均匀的问题并减少单双盘故障时需要读取的数据总量,提升了三盘故障的修复成功率。实验结果表明LHRC与RDP、LRRDP、DRDP相比,LHRC可将单盘故障修复时间节省3.92%~29.91%、双盘故障修复时间节省7.79%~30.64%。

关键词：阵列码存储系统局部修复读取开销

Estimating the Budgets of Nutrients for Phytoplankton Bloom inthe Central Yellow Sea Using a Modified LowerTropic Ecosystem Model

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Journal of Ocean University of China 2014年第1期13卷 1-12页

作者： Chengyi Yuan yuheng wang Hao Wei College of Physical and Environmental Oceanography Ocean University of China Qingdao P. R. China College of Marine Science and Engineering Tianjin University of Science and Technology Tianjin P. R. China

A modified lower trophic ecosystem model （NEMURO） is coupled with a three-dimensional hydrodynamic model for anapplication in the central Yellow Sea. The model is used to simulate the horizontal distributions and annual cycles of chlorophyll-aand nutrients with results consistent with historical observations. Generally, during the winter background and spring bloom periods,the exchange with neighboring waters constitutes the primary sources of nutrients. Howerver, during the winter background period,the input of silicate from the layer deeper than 50 m is the most important source that contributes up to 60% to the total sources. Dur-ing the spring bloom period, the transport across the thermocline makes significant contribution to the input of phosphate and *** the post spring bloom period, the relative contribution of relevant processes varies for different nutrients. For ammonium,atmospheric deposition, excretion of zooplankton and decomposition of particulate and dissolved nitrogen make similar contributionsFor phosphate and silicate, the dominant input is the transport across the thermocline, accounting for 62% and 68% of the totalsources, respectively. The N/P ratio averaged annually and over the whole southern Yellow Sea is up to 51.8, indicating the potentialof P limitation in this region. The important influence of large scale sea water circulation is revealed by both the estimated fluxes andthe corresponding N/P ratio of nutrients across a section linking the northeastern bank of the Changjiang River and Cheju *** the winter background period, the input of nitrate, ammonium, phosphate and silicate by the Yellow Sea Warm Current isestimated to be 4.6~ 101~, 2.3x 101~, 2.0x 109 and 1.2x 101~ mol, respectively.

关键词： budgets of nutrients spring bloom central Yellow Sea NEMURO

Rhizobacteria helps to explain the enhanced efficiency of phytoextraction strengthened by Streptomyces pactum

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Journal of Environmental Sciences 2023年第3期125卷 73-81页

作者： Linlin wang Ninawang Di Guo Zhengzheng Shang Yiying Zhang Song Liu yuheng wang School of Ecology and Environment Northwestern Polytechnical UniversityXi’an 710129China Xi’an Aisen Environmental Information Technology Service Co. LtdXi’an 710119China Department of Microbiology and Immunology University of Western OntarioLondonON N6A 5C1Canada State Key Laboratory of Crop Stress Biology for Arid Areas and College of Agronomy Northwest A&F UniversityYangling 712100China

The ultimate purpose of phytoextraction is not only to remove heavy metals from soil but also to improve soil ***, we evaluated how the joint effect of Streptomyces pactum(strain Act12) and inorganic(Hoagland’s solution) and organic(humic acid and peat) nutrients affected the phytoextraction practice of cadmium(Cd) and zinc(Zn) by potherb mustard, and the microbial community composition within rhizosphere was also *** results indicated that the nutrients exerted synergistically with Act12, all increasing the plant biomass and Cd/Zn *** inoculation of Act12 alone significantly increased dehydrogenase activity of rhizosphere soil(PAct12>Humic acid >Hoagland’s ***, Sphingomonas replaced Thiobacillus as dominant genus after Act12 *** increase in the Sphingomonas and Flavisolibacter abundances under Act12 and nutrients treatments gave rise to growth-promoting effect on *** results revealed the important role for rhizosphere microbiota in mediating soil biochemical traits and plant growth, and our approach charted a path toward the development of Act12 combined with soil nutrients to enhance soil quality and phytoextraction efficiency in Cd/Zn-contaminated soils.

关键词： Phytoextraction Streptomyces pactum Enzymatic activity Microbial community

Preparation of nanocrystalline palladium on p-Si by electroless deposition and its photo-electrochemical hydrogen evolution property

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Rare Metals 2006年第3期25卷 241-245页

作者： YAO Suwei LI He ZHANG Weiguo wang Hongzhi BEN yuheng SUGIYAMA Laboratory of Surface Technology School of Chemical Engineering and Technology Tianjin University Tianjin 300072 China

The Pd-modified p-Si electrode was prepared by means of electroless deposition. The average diameter of Pd nanoparticles was about 80 nm from SEM observations. XRD results showed that the structure of Pd coatings was nanocrystalline. The catalyzing properties of the Pd-modified p-Si electrode for hydrogen evolution under illumination and in dark were studied with the constant current polarization method. The polarization potential for hydrogen evolution reac- tion （HER） of the Pd/p-Si electrode under illumination was 250 mV lower than that in dark, and was 450 mV lower than that of p-Si in dark at the current density of 2.5 mA·cm^-2. The results of electrochemistry impedance spectra （EIS） showed that electrochemistry HER resistance of the modified electrode under illumination decreased from 593.12 to 442.20 Ω·cm^2, and the HER rate increased evidently.

关键词： electrochemistry Pd-modified p-Si electrode electroless hydrogen evolution reaction

Coupling of an Individual-Based Model of Anchovy with Lower Trophic Level and Hydrodynamic Models

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Journal of Ocean University of China 2013年第1期12卷 45-52页

作者： wang yuheng WEI Hao Michio J. Kishi Key Laboratory of Physical Oceanography Ocean University of China College of Marine Science and Engineering Tianjin University of Science and Technology Faculty of Fisheries Sciences Hokkaido University

Anchovy （Engraulis aponicus）, a small pelagic fish and food of other economic fishes, is a key species in the Yellow Sea ecosystem. Understanding the mechanisms of its recruitment and biomass variation is important for the prediction and management of fishery resources. Coupled with a hydrodynamic model （POM） and a lower trophic level ecosystem model （NEMURO）, an individual-based model of anchovy is developed to study the influence of physical environment on anchovy＇s biomass variation, Seasonal variations of circulation, water temperature and mix-layer depth from POM are used as external forcing for NEMURO and the anchovy model. Biomasses of large zooplankton and predatory zooplankton which anchovy feeds on are output from NEMURO and are controlled by the consumption of anchovy on them. Survival fitness theory related to temperature and food is used to determine the swimming action of anchovy in the model. The simulation results agree well with observations and elucidate the influence of temperature in over-wintering migration and food in feeding migration.

关键词： anchovy individual-based model population dynamics Yellow Sea

MAG molten pool edge detection algorithm based on a fusion of dark channel prior dehazing and image enhancement

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Optoelectronics Letters 2024年第10期20卷 607-613页

作者： LIU Weipeng QU Zepeng GONG Xiangrui wang yuheng ZHOU Zhengkui School of Electrical Engineering Hebei University of TechnologyTianjin300401China School of Artificial Intelligence and Data Science Hebei University of TechnologyTianjin300401China

Metal active gas(MAG)welding is one of the widely applied welding techniques using argon and carbon dioxide as shielding *** response to the problem of welding halo and drag shadow during the image acquisition process of it,which makes it difficult to accurately extract the contour of the molten pool,this paper proposes a molten pool edge detection method that combines dark channel prior dehazing(DCPD)and improved single scale Retinex image enhancement *** method overcomes the problem of excessive edge noise in the original molten pool image and the difficulty in feature extraction caused by the dark part of the molten pool after DCPD *** comparative experiments and ablation experiments,it has been shown that the algorithm proposed in this paper has significantly improved the enhancement effect and feature extraction effect,extracting accurate and complete molten pool contours.

关键词： welding image algorithm

Microbial-driven ectopic uranium extraction with net electrical energy production

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Frontiers of Environmental Science & Engineering 2024年第1期18卷 49-58页

作者： Xin Tang Yin Ye Chunlin wang Bingqian wang Zemin Qin Cui Li Yanlong Chen yuheng wang Zhiling Li Miao Lv Aijie wang Fan Chen School of Ecology and Environment Northwestern Polytechnical UniversityXi’an 710129China School of Materials Science and Engineering Xi’an University of Architecture and TechnologyXi’an 710055China State Key Laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbin 150090China Faculty of Geosciences and Environmental Engineering Southwest Jiaotong UniversityChengdu 611756China

The extraction of uranium (U) from U-bearing wastewater is of paramount importance for mitigating negative environmental impacts and recovering U resources. Microbial reduction of soluble hexavalent uranium (U(VI)) to insoluble tetravalent uranium (U(IV)) holds immense potential for this purpose, but its practical application has been impeded by the challenges associated with managing U-bacterial mixtures and the biotoxicity of U. To address these challenges, we present a novel spontaneous microbial electrochemical (SMEC) method that spatially decoupled the microbial oxidation reaction and the U(VI) reduction reaction. Our results demonstrated stable and efficient U extraction with net electrical energy production, which was achieved with both synthetic and real wastewater. U(VI) removal occurred via diffusion-controlled U(VI)-to-U(IV) reduction-precipitation at the cathode, and the UIVO_(2) deposited on the surface of the cathode contributed to the stability and durability of the abiotic U(VI) reduction. Metagenomic sequencing revealed the formation of efficient electroactive communities on the anodic biofilm and enrichment of the key functional genes and metabolic pathways involved in electron transfer, energy metabolism, the TCA cycle, and acetate metabolism, which indicated the ectopic reduction of U(VI) at the cathode. Our study represents a significant advancement in the cost-effective recovery of U from U(VI)-bearing wastewater and may open a new avenue for sustainable uranium extraction.

关键词： U(VI)bioreduction Electricity production Reaction decoupling Uranium-bearing wastewater Biofilm microbiome

Flexible pressure sensors with ultrahigh stress tolerance enabled by periodic microslits

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Microsystems & Nanoengineering 2024年第1期10卷 301-311页

作者： Song wang Chenying wang Yifan Zhao Yujing Zhang Yaxin Zhang Xiangyue Xu Qijing Lin Kai Yao yuheng wang Feng Han Yu Sun Zhuangde Jiang State Key Laboratory for Manufacturing Systems Engineering International Joint Laboratory for Micro/Nano Manufacturing and Measurement TechnologiesSchool of Mechanical EngineeringXi’an Jiaotong UniversityXi’anChina State Key Laboratory for Manufacturing Systems Engineering International Joint Laboratory for Micro/Nano Manufacturing and Measurement TechnologiesSchool of Instrument Science and TechnologyXi’an Jiaotong UniversityXi’anChina The Faculty of Electrical Engineering and Computer Science Ningbo UniversityNingboChina Department of Mechanical and Industrial Engineering University of TorontoTorontoCanada

Stress tolerance plays a vital role in ensuring the effectiveness of piezoresistive sensing films used in flexible pressure ***,existing methods for enhancing stress tolerance employ dome-shaped,wrinkle-shaped,and pyramidal-shaped microstructures in intricate molding and demolding processes,which introduce significant fabrication challenges and limit the sensing *** address these shortcomings,this paper presents periodic microslits in a sensing film made of multiwalled carbon nanotubes and polydimethylsiloxane to realize ultrahigh stress tolerance with a theoretical maximum of 2.477 MPa and a sensitivity of 18.092 kPa−*** periodic microslits permit extensive deformation under high pressure(e.g.,400 kPa)to widen the detection ***,the periodic microslits also enhance the sensitivity based on simultaneously exhibiting multiple synapses within the sensing interface and between the periodic sensing *** proposed solution is verified by experiments using sensors based on the microslit strategy for wind direction detection,robot movement sensing,and human health *** these experiments,vehicle load detection is achieved for ultrahigh pressure sensing under an ultrahigh pressure of over 400 kPa and a ratio of the contact area to the total area of 32.74%.The results indicate that the proposed microslit strategy can achieve ultrahigh stress tolerance while simplifying the fabrication complexity of preparing microstructure sensing films.

关键词： robot shaped stress