检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

电解废液与锌冶炼烟尘协同处理试验研究

中国有色冶金 2024年第2期53卷 114-120页

作者：解万文文堪王铧泰刘远周华荣高昭伟西部矿业集团科技发展有限公司青海西宁810006 青海省高原矿物加工工程与综合利用重点实验室青海西宁810006 青海省有色矿产资源工程技术研究中心青海西宁810006

为综合回收锌冶炼烟尘及电解废液中的有价金属,本研究进行了利用锌电解废液浸出锌冶炼烟尘试验,通过一段浸出、碳酸钠中和沉锌及氢氧化钠中和沉镁等工序获得了沉锌产品和沉镁产品,通过两段浸出、萃取反萃、中和沉铟等工序获得了富铟渣... 详细信息

为综合回收锌冶炼烟尘及电解废液中的有价金属,本研究进行了利用锌电解废液浸出锌冶炼烟尘试验,通过一段浸出、碳酸钠中和沉锌及氢氧化钠中和沉镁等工序获得了沉锌产品和沉镁产品,通过两段浸出、萃取反萃、中和沉铟等工序获得了富铟渣及副产物铅银渣。试验最佳工艺条件:一段浸出为液固比4:1,浸出温度80℃,浸出时间75 min,在此条件下,锌浸出率可达78.69%,铟浸出率仅为8.4%;锌镁分离最佳终点pH值区间为6.86~7.80;二段浸出最佳工艺条件为终点pH值1.08,液固比3:1,浸出温度75℃,浸出时间10 h,在此条件下,铟浸出率可达86.84%。该研究可为炼锌厂开路除杂及综合回收有价金属提供新思路。

关键词：氧压浸出炼锌烟尘炼锌电解废液协同处理综合回收以废治废

Chemical fractionations and bioavailability of cadmium and zinc to cole (Brassica campestris L.) grown in the multi-metals contaminated oasis soil,northwest of China

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2011年第2期23卷 275-281页

作者： Yiming Yang Zhongren Nan Zhuanjun Zhao Shengli Wang zhaowei Wang Xia Wang Key Laboratory of Western China' s Environmental System Ministry of Education College of Resource and Environment Lanzhou University Lanzhou 730000 China School of Chemical Engineering North West University for Nationalities Lanzhou 730030 China

A pot experiment was conducted to study the relationship between distribution of cadmium （Cd） and zinc （Zn） and their availability. to cole （Brassica campestris L.） grown in the multi-metal contaminated oasis soil in northwest of China. The results showed that Cd and Zn in the unpolluted oasis soil was mainly found in the residual fractionation, however, with increasing contents of Cd and Zn in the oasis soil, the distribution of Cd and Zn changed significantly. The growth of cole could be promoted by low Cd and Zn concentration, but significantly restrained by high concentrations. There was antagonistic effect among Cd and Zn in the multi-metals contaminated oasis soil. Stepwise regression analysis between fractionations distribution coefficients of the two meals in the soil and their contents in cole showed that both Cd and Zn in the exchangeable fractionation in the oasis soil made the most contribution on the uptake of Cd and Zn in cole. The bio-concentration factor （BCF） of Cd was greater than Zn in cole, and BCFs of the two metals in leaves were greater than those in roots. The translocation factors of the two metals in cole were greater than 1, and the two metals mainly accumulated in the edible parts in cole. Therefore, cole is not a suitable vegetable for the oasis soil because of the plants notable contamination by heavy metals.

关键词： fractionation bioavailability cadmium and zinc cole oasis soil

Rate-Energy Tradeoff for Wireless Simultaneous Information and Power Transfer in Full-Duplex and Half-Duplex Systems

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2020年第11期65卷 1373-1384页

作者： Xiaoye Shi Jin Sun Dongming Li Fei Ding zhaowei Zhang Department of Internet of Things Nanjing University of Posts and TelecommunicationsNanjing210003China Department of Electronic and Electrical Engineering University College LondonLondonWC1E 6BTUK

In this paper,we study the rate-energy tradeoff for wireless simultaneous in-formation and power transfer in full-duplex and half-duplex *** this end,the weighting function of energy efficiency and transmission rate,as rate-energy tradeoff metric is first introduced and the metric optimization problem is *** Karush-Kuhn-Tucker(KKT)conditions for Lagrangian optimality and a series of mathematical approximations,the metric optimization problem can be *** closed-form solution of the power ratio is obtained,building direct relationship between power ratio and the rate-energy tradeoff *** choosing power ratio,one can make the tradeoff between information rate and harvested power in a straightforward and efficient *** the method similar to the half duplex systems,the optimal power ratio can be obtained in the full duplex systems,so as to balance the information transmission rate and energy transmission *** results validate that the information rate is non-increasing with harvested power in half-duplex systems and the tradeoff of information rate and harvested power can be simply *** the full duplex systems,the power ratio solution of the rate-energy tradeoff metric optimization problem can be used as the approximate optimal solution of the optimization problem and the approximation error is negligible.

关键词： Power transfer full duplex optimization problem

基于深度相机和二维码的室内移动机器人定位技术

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

农业装备与车辆工程 2024年第6期62卷 124-129页

作者：唐振宇张兆威蒋林武汉科技大学冶金装备及其控制教育部重点实验室湖北武汉430081 武汉科技大学机器人与智能系统研究院湖北武汉430081

提出一种以ORB_SLAM2为基本框架、使用二维码辅助深度相机的室内移动机器人定位方法。针对现有的视觉SLAM在定位过程中出现的Z轴漂移现象,提出平面运动模型约束,以降低机器人定位结果中的Z轴累计误差;针对视觉SLAM在弱纹理环境中算法退... 详细信息

提出一种以ORB_SLAM2为基本框架、使用二维码辅助深度相机的室内移动机器人定位方法。针对现有的视觉SLAM在定位过程中出现的Z轴漂移现象,提出平面运动模型约束,以降低机器人定位结果中的Z轴累计误差;针对视觉SLAM在弱纹理环境中算法退化、容易跟踪失败等问题,在室内环境中张贴二维码并将其数学模型作为定位约束,以提高系统的准确性与鲁棒性。真实环境下的实验结果表明:相比原始算法,所提算法在Z轴精度上提高了42.95%;以ORB_SLAM3的定位结果为真值,所提算法的定位精度提高了4.11%,该算法在室内环境下具有定位优势。

关键词：移动机器人同步定位地图构建深度相机二维码平面运动模型约束

家族性与散发性分化型甲状腺癌患者^(131)I治疗反应与临床转归的比较

在线全文

学校读者我要写书评

暂无评论

中华放射医学与防护杂志 2024年第6期44卷 531-536页

作者：季艳会王萱李雪孙丹阳肖茜何雅静孟召伟贾强谭建郑薇天津医科大学总医院核医学科天津300052

目的分析不同家族性分化型甲状腺癌(FDTC)与散发性分化型甲状腺癌(SDTC)患者首次^(131)I治疗(RIT)反应的临床转归及影响因素。方法对2016年1月至2022年1月间于天津医科大学总医院接受RIT的120例FDTC与480例SDTC患者进行回顾性分析。分... 详细信息

目的分析不同家族性分化型甲状腺癌(FDTC)与散发性分化型甲状腺癌(SDTC)患者首次^(131)I治疗(RIT)反应的临床转归及影响因素。方法对2016年1月至2022年1月间于天津医科大学总医院接受RIT的120例FDTC与480例SDTC患者进行回顾性分析。分析两组患者首次RIT不同疗效反应,分析无病(NED)亚组的无病生存期(DFS)、生化疾病持续(BPD)及结构或功能性疾病持续(S/FPD)亚组的无进展生存期(PFS),并筛选未达到NED状态的危险因素。结果首次RIT后FDTC及SDTC组达到NED、BPD及S/FPD状态的患者分别为56(46.7%)、50(41.7%)、14(11.6%)及284(59.1%)、160(33.3%)、36(7.5%)例(χ^(2)=10.10,P=0.013)。末次随访时,FDTC及SDTC组达到NED、BPD及S/FPD状态的患者分别为71(59.1%)、36(30.1%)、13(10.8%)及337(70.2%)、114(23.7%)、29(6.1%)例(χ^(2)=8.99,P=0.026)。家族性(F)-NED及散发性(S)-NED亚组患者5年DFS率分别为92.4%及97.4%;F⁃BPD及S⁃BPD亚组5年PFS率分别为88.3%及90.8%;F⁃S/FPD及S⁃S/FPD亚组5年PFS率分别为78.2%及79.6%。采用二元logistic单因素分析显示肿瘤最大径、T分期、M分期、复发危险度分层、术后刺激状态甲状腺球蛋白(p⁃sTg)与患者否达到NED状态相关(χ^(2)=6.37~13.10,P<0.05);采用二元logistic多因素回归分析显示T分期、p⁃sTg是能否达到NED状态的独立危险因素(χ^(2)=0.11~11.33,P<0.05)。结论初始RIT治疗反应有助于指导后续治疗和随访策略,SDTC患者临床转归优于FDTC患者,应提高FDTC患者前站RIT警惕性,对于p⁃sTg及T分期较高患者,应酌情增加首次RIT剂量、缩短随访间隔。

关键词：家族性甲状腺癌治疗反应 ^(131)I治疗疾病状态

在线全文

学校读者我要写书评

暂无评论

基于高分子增透剂的煤层注水增渗作用分析

能源与环保 2024年第5期46卷 84-90页

作者：詹召伟葛俊岭徐振刘涛济宁矿业集团有限公司霄云煤矿山东济宁272213 济宁市能源局山东济宁272213 中煤科工集团重庆研究院有限公司重庆400037

为提高煤体润湿性与注水渗透效果,以自行制备的天然高分子增透剂为基础,从增透剂的反应过程、分子结构微晶结构及其与煤的表面形貌作用效果和润湿作用机理出发,研究了天然高分子增透剂对煤的增渗作用机理,同时利用分子动力学模拟研究了... 详细信息

为提高煤体润湿性与注水渗透效果,以自行制备的天然高分子增透剂为基础,从增透剂的反应过程、分子结构微晶结构及其与煤的表面形貌作用效果和润湿作用机理出发,研究了天然高分子增透剂对煤的增渗作用机理,同时利用分子动力学模拟研究了增透剂与煤粉之间的微观作用机理。研究结果表明,添加高分子增透剂后,水对于煤的润湿能力大幅度提升,在相同时间内添加高分子增透剂的试验组呈现出最佳的渗透效果;分子动力学模拟得到增透剂—煤体系的相互作用强度为-232.19 eV,而水—煤体系的相互作用强度为-34.60 eV,表明添加增透剂的溶液体系中水分子更容易附着在煤分子表面上,分子间相互作用力增强,会使附着在煤表面的分子结构更加稳定,更有利于煤表面的润湿。研究结果为煤层注水增透剂的研发和应用提供了参考依据,有助于进一步提高煤层注水抑尘效果。

关键词：煤层注水增透剂分子改性增渗机理润湿性

Low-cost and high safe manganese-based aqueous battery for grid energy storage and conversion

在线全文

学校读者我要写书评

暂无评论

Science Bulletin 2019年第23期64卷 1780-1787页

作者： Jianhang Huang zhaowei Guo Xiaoli Dong Duan Bin Yonggang Wang Yongyao Xia Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Institute of New EnergyiChEM(Collaborative Innovation Center of Chemistry for Energy Materials)Fudan UniversityShanghai 200433China Key Laboratory of the Ministry of Education for Advanced Catalysis Materials Department of ChemistryZhejiang Normal UniversityJinhua 321004China School of Materials Science and Engineering Nanchang Hangkong UniversityNanchang 330063China

As an effective energy storage technology, rechargeable batteries have long been considered as a promising solution for grid integration of intermittent renewables(such as solar and wind energy). However,their wide application is still limited by safety issue and high cost. Herein, a new battery chemistry is proposed to satisfy the requirements of grid energy storage. We report a simple Cu-Mn battery, which is composed of two separated current collectors in an H2SO4-CuSO4-MnSO4 electrolyte without using any membrane. The Cu-Mn battery shows an energy density of 40.8 Wh L-1, a super-long life of 10,000 cycles(without obvious capacity decay) and negligible self-discharge. And the capital cost of US$ 11.9 kWh-1 based on electrolyte is lower than any previous batteries. More importantly, the battery can still work smoothly during thermal abuse test and drill-through test, showing high safe nature. Furthermore, a combination system integrating the Cu-Mn battery and hydrogen evolution is also proposed, which is able to avoid the generation of explosive H2/O2 mixture, and presents an efficient approach for grid energy storage and conversion.

关键词： Manganese dioxide Copper electrode Aqueous battery Decoupled hydrogen evolution Water splitting Large-scale energy storage

Fundamental solutions of critical wedge angles for one-dimensional piezoelectric quasicrystal wedge

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 2022年第5期43卷 709-728页

作者： Xiang MU Xiaoyu FU Liangliang ZHANG zhaowei ZHU Jinming ZHANG Yang GAO College of Science China Agricultural UniversityBeijing 100083China College of Engineering China Agricultural UniversityBeijing 100083China

Two problems of a one-dimensional(1D)piezoelectric quasicrystal(QC)wedge are investigated,i.e.,the two sides of the wedge subject to uniform tractions and the wedge apex subject to the concentrated *** virtue of the Stroh formalism and Barnett-Lothe matrices,the analytical expressions of the displacements and stresses are derived,and the generalized solutions for the critical wedge angles are *** examples are given to present the mechanical behaviors of the wedge in each *** results indicate that the effects of the uniform tractions and the concentrated force on the phonon field displacement are larger than those on the phason field.

关键词： quasicrystal(QC) wedge piezoelectric effect critical angle analytical solution

A Novel Hybrid Vortex Search and Artificial Bee Colony Algorithm for Numerical Optimization Problems

在线全文

学校读者我要写书评

暂无评论

Wuhan University Journal of Natural Sciences 2017年第4期22卷 295-306页

作者： WANG zhaowei WU Guomin WAN Zhongping School of Mathematics and Statistics Wuhan University Department of Mathematics and Physics Beijing Institute of Petrochemical Technology

Though vortex search（VS） algorithm has good performance in solving global numerical optimization problems, it cannot fully search the whole space occasionally. Combining the vortex search algorithm and the artificial bee colony algorithm（ABC） which has good performance in exploration, we present a HVS（hybrid vortex search） algorithm to solve the numerical optimization problems. We first use the employed bees and onlooker bees of ABC algorithm to find a solution, and then adopt the VS algorithm to find the best solution. In the meantime, we cannot treat the best solution so far as the center of the algorithm all the time. The algorithm is tested by 50 benchmark functions. The numerical results show the HVS algorithm has superior performance over the ABC and the VS algorithms.

关键词： numerical optimization problems vortex searchalgorithm artificial bee colony algorithm hybrid algorithm