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Experimental investigation of the inhibition of deep-sea mining sediment plumes by polyaluminum chloride

International Journal of Mining Science and Technology 2024年第1期34卷 91-104页

作者： Fengpeng zhang Xuguang Chen Jiakang wei Yangyang zhang weikun Xu hao Li College of Engineering Ocean University of ChinaQingdao 266100China Shandong Province Key Laboratory of Ocean Engineering Ocean University of ChinaQingdao 266100China China Merchants Marine and Offshore Research Institute Co. Ltd.Shenzhen 518000China National Deep Sea Center Qingdao 266237China

Deep-sea sediment disturbance may occur when collecting polymetallic nodules,resulting in the creation of plumes that could have a negative impact on the ecological *** study aims to investigate the potential solution of using polyaluminum chloride(PAC)in the water *** effects of PAC are examined through a self-designed simulation system for deep-sea polymetallic nodule collection and sediment samples from a potential deep-sea mining *** experimental results showed that the optimal PAC dose was found to be 0.75 g/*** with the test conditions without the addition of PAC,the presence of PAC leads to a reduction in volume,lower characteristic turbidity,smaller diffusion velocity,and shorter settling time of the *** indicates that PAC inhibits the entire development process of the *** addition of PAC leads to the flocculation of mm-sized particles,resulting in the formation of cm-sized *** flocculation of particles decreases the rate of erosion on the seabed by around 30%.This reduction in erosion helps to decrease the formation of ***,when the size of suspended particles increases,it reduces the scale at which they ***,the settling velocity of flocs(around 10^(-2) m/s)is much higher that of compared to sediment particles(around 10^(-5) m/s),which effectively reduces the amount of time the plume remains in suspension.

关键词： Deep-sea mining Deep-sea polymetallic nodules Sediment plume Polyaluminum chloride Jet impact Particle flocculation

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Fast and high-fidelity generation of photonic Greenberger-Horne-Zeilinger states in circuit QED

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Communications in Theoretical Physics 2020年第1期72卷 52-59页

作者： Jingwei Chen Guan-hao Feng Hong-hao zhang L F wei School of Physics Sun Yat-sen UniversityGuangzhou 510275China Photonics Laboratory and Institute of Functional Materials College of ScienceDonghua UniversityShanghai 201620China Information Quantum Technology Laboratory School of Information Science and TechnologySouthwest Jiaotong UniversityChengdu 610031China

A fast scheme to generate Greenberger-Horne-Zeilinger states between different cavities in circuit QED systems is *** implement this scheme,we design a feasible experimental device with three qubits and three *** this device,all the couplings between qubit and qubit,cavity and qubit are tunable and are independent with frequencies,and thus the shortcut to adiabaticity technique can be directly applied in our *** is demonstrated that the GHZ state can be generated rapidly with high fidelity in our scheme.

关键词： GHZ states shortcut to adiabaticity quantum state engineering circuit QED

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Removal of refractory organics and heavy metals in landfill leachate concentrate by peroxi-coagulation process

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Journal of Environmental Sciences 2022年第6期34卷 43-51页

作者： Dun Liu Ying Yuan Yuquan wei hao zhang Yanxiao Si Fang zhang School of Environment and State Key Joint Laboratory of Environment Simulation and Pollution Control Tsinghua UniversityBeijing 100084China Beijing Advanced Innovation Center for Big Data-based Precision Medicine Beihang UniversityBeijing 100191China

Landfill leachate is a complex effluent and it is difficult to deal with. Electrochemical methods have been considered as a promising alternative technology for treatment of landfill leachate with refractory organic contaminants and heavy metals. Peroxi-coagulation(PC)process with iron anode and modified graphite felt cathode was developed for efficient landfill leachate concentrate treatment. Compared to electro-Fenton(EF) and electrocoagulation(EC) processes, the PC process was more cost-effective due to the combined action of·OH oxidation and iron hydroxides coagulation. A maximal TOC removal of 77.2% ± 1.4% was obtained after 360 min at initial p H = 5.0 and current density of 10 m A/cm^(2). After the PC process, concentrations of all seven heavy metals in the final effluents were below the allowable emission limits given by the present regulatory standards. The method preference for heavy metal removal was PC > EC > EF. Based on the three-dimensional fluorescence spectroscopy coupled with regional integration analysis during the PC treatment, the florescence peaks of both humic acids and fulvic acids disappeared after treatment for 360min. Decreasing trends were observed in the fluorescent regional standard volumes for aromatic protein Ⅰ(31.4%), aromatic protein Ⅱ(63.7%), fulvic acid-like(69.5%), soluble microbial by-product-like(75%) and humic acid-like regions(76.3%). The results indicate that comparing to the EF and EC process, the PC process provide a promising and more cost-effective alternative for the treatment of landfill leachate concentrate.

关键词： Landfill leachate Peroxi-coagulation Electro-Fenton Electrocoagulation Modified cathode

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Thermodynamic and Techno-economic Analysis of a Triple-pressure Organic Rankine Cycle: Comparison with Dual-pressure and Single-pressure ORCs

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Acta Geologica Sinica(English Edition) 2021年第6期95卷 1857-1869页

作者： YU hao LU Xinli zhang wei zhang Jiaqi Tianjin Geothermal Research and Training Center Tianjin UniversityTianjin 300350China Key Laboratory of Efficient Utilization of Low and Medium Grade Energy MOETianjin UniversityTianjin 300350China

Investigation of a triple-pressure organic Rankine cycle(TPORC) using geothermal energy for power generation with the net power output of the TPORC analyzed by varying the evaporation pressures, pinch temperature differences(tpp) and degrees of superheat(tsup) aimed to find the optimum operation conditions of the system. The thermodynamic performance of the TPORC was compared with a dual-pressure organic Rankine cycle(DPORC) and a single-pressure ORC(SPORC) for geofluid temperatures ranging from 100°C to 200°C, with particular reference to the utilization of a hot dry rock(HDR) geothermal resource. Thermodynamic performances of the TPORC system using eight different organic working fluids have also been investigated in terms of the net power outputs. Results show that a higher geofluid mass flow rate can make a considerable contribution to shortening the payback period(PBP) as well as to decreasing the levelized electricity cost(LEC), especially when the geofluid temperature is low. For the temperature range investigated, the order from high to low based on thermodynamic and techno-economic performances is found to be TPORC > DPORC > SPORC. In terms of using geothermal resources within the given temperatures range(100°C–200°C), the TPORC system can be a better choice for geothermal power generation so long as the wellhead geofluid temperature is between 140°C and 180°C.

关键词： geothermal energy techno-economics power generation systems triple-pressure organic Rankine cycle(TPORC) thermodynamic performance

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染色方式及烧结温度对金瓷修复体颜色的影响

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上海口腔医学 2004年第6期13卷 553-556页

作者：王焱严伟浩张新春黄粤申林汉中山大学光华口腔医学院修复科广东广州510060

目的:探讨不同染色方式和烧结温度对金属烤瓷颜色的影响。方法:利用预制标准模具,制作40个直径15mm、长6mm的圆柱状金属烤瓷标准试件并进行着色。金属基底、遮色瓷层、牙本质瓷层及釉质瓷层厚度分别为2mm、1mm、2mm和1mm。制作过程分A-E... 详细信息

目的:探讨不同染色方式和烧结温度对金属烤瓷颜色的影响。方法:利用预制标准模具,制作40个直径15mm、长6mm的圆柱状金属烤瓷标准试件并进行着色。金属基底、遮色瓷层、牙本质瓷层及釉质瓷层厚度分别为2mm、1mm、2mm和1mm。制作过程分A-E5组,每组8个。A组采用内染法;B组采用外染法,两组均用900℃烧结温度;C到E组均采用外染法,但烧结温度分别为880℃、900℃、920℃。瓷粉和着色剂采用松风A2色及松风44色着色剂系列。以标准白板作参照,用测色仪测定各试件的颜色值(L*a*b*坐标)并进行t检验和单因素方差分析。结果:B组(外染法)和A组(内染法)的色差值△E、b*值和彩度值△Cab*分别为43.72±2.99,26.51±1.64,31.31±2.48和39.71±1.78,23.69±0.36,26.55±2.16,前者显著大于后者(P<0.05);C、D、E组的各颜色参数无显著性差异。结论:染色方法对修复体的颜色有明显影响;在临床常用的烧结温度范围内,温度的变化对外染法的颜色无明显影响。

关键词：染色方式烧结温度金属烤瓷修复颜色

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酿酒葡萄皮渣对单栏饲养方式下公绵羊繁殖性能及睾丸抗氧化性的影响

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畜牧兽医学报 2016年第11期47卷 2228-2239页

作者：金亚倩刘文忠赵俊星任有蛇张春香张文佳项斌伟马雪豪张建新山西农业大学动物科技学院太谷030801 山西省右玉县畜牧局右玉037200

旨在研究日粮中添加一定量的酿酒葡萄皮渣对绵羊繁殖性能及睾丸抗氧化性能的影响。试验选取30只5月龄,体重(25±1)kg的杜泊×小尾寒羊杂交公羊,采用完全随机设计平均分为5组。1组自由活动,其余4组单栏饲养,建立应激模型。自由活动绵羊... 详细信息

旨在研究日粮中添加一定量的酿酒葡萄皮渣对绵羊繁殖性能及睾丸抗氧化性能的影响。试验选取30只5月龄,体重(25±1)kg的杜泊×小尾寒羊杂交公羊,采用完全随机设计平均分为5组。1组自由活动,其余4组单栏饲养,建立应激模型。自由活动绵羊饲喂未添加葡萄皮渣日粮,单栏饲养绵羊分别饲喂不同葡萄皮渣添加水平(0%、5%、10%、20%)日粮。试验期80d。试验结束后,屠宰取样,测定睾丸系数并作附睾精子分析,测定睾丸组织抗氧化水平,对睾丸组织中Cu-ZnSOD、CAT、GPx4及Nrf2mRNA和蛋白相对表达量进行研究。结果表明,与自由活动组相比,单栏组绵羊睾丸组织中MDA及ROS水平升高(P<0.01),睾丸重量显著降低(P<0.05),睾丸系数也表现出下降趋势(P=0.06),附睾精子密度及顶体完整率显著降低(P<0.05),精子活动率极显著降低(P<0.01),精子畸形率极显著升高(P<0.01),表明单栏饲养方式对绵羊造成氧化应激,并在一定程度上影响绵羊繁殖性能。适量添加酿酒葡萄皮渣后,绵羊附睾精子密度和精子活动率均显著升高(P<0.05),精子畸形率显著降低(P<0.05),睾丸组织MDA含量显著下降(P<0.01),SOD、CAT及GSH-Px活性均显著提高(P<0.01,P<0.05,P<0.01);睾丸组织中Cu-ZnSOD mRNA相对表达量显著提高(P<0.05),Cu-ZnSOD、CAT、GPx4蛋白相对表达量显著提高(P<0.05)。综上表明,酿酒葡萄皮渣可以提高单栏饲养方式下绵羊睾丸组织抗氧化性,进而改善绵羊繁殖性能。

关键词：单栏饲养酿酒葡萄皮渣公绵羊睾丸繁殖性能抗氧化性

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Synthesis of steel slag ceramics: chemical composition and crystalline phases of raw materials

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International Journal of Minerals,Metallurgy and Materials 2015年第3期22卷 325-333页

作者： Li-hua Zhao wei wei hao Bai Xu zhang Da-qiang Cang School of Metallurgical and Ecological Engineering University of Science and Technology Beijing State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing

Two types of porcelain tiles with steel slag as the main raw material （steel slag ceramics） were synthesized based on the CaO-A1203-SiO2 and CaO--MgO-SiO2 systems, and their bending strengths up to 53.47 MPa and 99.84 MPa, respectively, were obtained. The presence of anorthite, a-quartz, magnetite, and pyroxene crystals （augite and diopside） in the steel slag ceramics were very different from the composition of traditional ceramics. X-ray diffraction （XRD） and electron probe X-ray microanalysis （EPMA） results illustrated that the addition of steel slag reduced the temperature of extensive liquid generation and further decreased the firing temperature. The considerable contents of glass-modifying oxide liquids with rather low viscosities at high temperature in the steel slag ceramic adobes promoted element diffusion and crystallization. The results of this study demonstrated a new approach for extensive and effective recycling of steel slag.

关键词： ceramic materials synthesis steel slag chemical composition crystalline phases solid waste recycling

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DeepFilter: A Deep Learning Based Variant Filter for VarDict

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Tsinghua Science and Technology 2023年第4期28卷 665-672页

作者： hao zhang Zekun Yin Yanjie wei Bertil Schmidt weiguo Liu School of Software Shandong UniversityJinan 250100China Shenzhen Research Institute of Shandong University Shenzhen 518057China Shenzhen Institute of Advanced Technology Chinese Academy of SciencesShenzhen 518055China Institute for Computer Science Johannes Gutenberg UniversityMainz 55128Germany

With the development of sequencing technologies,somatic mutation analysis has become an important component in cancer research and *** is a commonly used somatic variant caller for this *** the heuristic-based VarDict algorithm exhibits high sensitivity and versatility,it may detect higher amounts of false positive variants than callers,limiting its clinical *** address this problem,we propose DeepFilter,a deep-learning based filter for VarDict,which can filter out the false positive variants detected by VarDict *** approach trains two models for insertion-deletion mutations(InDels)and single nucleotide variants(SNVs),*** show that DeepFilter can filter at least 98.5%of false positive variants and retain 93.5%of true positive variants for InDels and SNVs in the commonly used tumor-normal paired *** code and pre-trained models are available at https://***/Leihaoa/DeepFilter.

关键词： variant filter deep learning somatic variant

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A novel variable topology design for a multi-flexible ejection mechanism

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Defence Technology（防务技术） 2020年第2期16卷 432-438页

作者： hao Liu Jun Zhou Zong-lai Mo Shi-wei zhang School of Astronautics Northwestern Polytechnical UniversityXi'an710072China School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing210094China Luoyang Opto-Electro Technology Development Center 471009China

The airborne missile launch mechanism often subjects to significant deformations induced by the large ejection force during high-speed actuations in missile ejection process,leading to a substantial deviation of separation parameters from designed values that threats safety of the *** study proposes a novel variable topology design for launch mechanism,achieved via a Prsmatic-Revolute-Revolute pair(PR-R)motion formed by the structural gap with a specific *** enables launch mechanism variability during missile ejection process and optimizes the ejection force given by the front and back ejection arms,and greatly optimizes the separation parameters during missile *** kinetics simulation analysis is conducted under working conditions of the original ejection mechanism and the novel mechanism with variable topology design,*** results show that the novel variable topology design is more befitting for the launch process in terms of system safety and controllability,effectively improving the separation posture,restraining the flexible effect of the mechanism,and fulfilling the effectiveness of the design value of multi-rigid body.

关键词： Variable topology Gap dynamics Multi-flexible body Flexible control Ejection mechanism

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Dissolution behavior of Al_(2)O_(3)inclusions into CaO-MgO-SiO_(2)-Al_(2)O_(3)-TiO_(2)system ladle slags

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International Journal of Minerals,Metallurgy and Materials 2024年第5期31卷 977-987页

作者： Zhiyin Deng Xiaomeng zhang Guangyu hao Chunxin wei Miaoyong Zhu Key Laboratory for Ecological Metallurgy of Multimetallic Mineral(Ministry of Education) Northeastern UniversityShenyang 110819China School of Metallurgy Northeastern UniversityShenyang 110819China TBEA Shenyang Transformer Group Co. Ltd.Shenyang 110141China Angang Steel Co. Ltd.Anshan 114021China

To investigate the dissolution behaviors of Al_(2)O_(3)inclusions in CaO-5wt%MgO-SiO_(2)-30wt%Al_(2)O_(3)-TiO_(2)system ladle slags,confocal scanning laser microscopy was conducted on the slags with different TiO_(2)contents(0-10wt%),and scanning electron microscopy was performed to study the interfacial reaction between Al_(2)O_(3)and this slag *** results disclose that the dissolution of Al_(2)O_(3)inclusions does not result in the formation of new phases at the boundary between the slag and the *** TiO_(2)-bearing and TiO_(2)-free ladle slags,there is no difference in the dissolution mechanism of Al_(2)O_(3)inclusions at steelmaking *** layer diffusion is found as the controlling step of the dissolution of Al_(2)O_(3),and the diffusion coefficient is in the range of 4.18×10^(-10)to 2.18×10^(-9)m^(2)/s at 1450-1500℃.Compared with the solubility of Al_(2)O_(3)in the slags,slag viscosity and temperature play a more profound role in the dissolution of Al_(2)O_(3)inclusions.A lower viscosity and a lower melting point of the slags are beneficial for the *** addition of TiO_(2)(e.g.,5wt%)in ladle slags can enhance the dissolution of Al_(2)O_(3)inclusions because of the low viscosity and melting point of the slags,while excessive addition of TiO_(2)(e.g.,10wt%)shows the opposite trend.

关键词： inclusions dissolution ladle refining slag titanium dioxide confocal scanning laser microscopy

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