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Improving gold recovery of Pb–Zn sulfide ore by selective activation with organic acid

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Rare Metals 2016年第2期35卷 198-203页

作者： dai-Xiong Chen Jun Xiao School of Minerals Processing and Bioengineering Central South University Hunan Provincial Key Laboratory of Complex Copper Lead Zinc Associated Metal Resources Comprehensive Utilization Hunan Research Institute for Nonferrous Metals

Free gold and gold wrapped in sulfides are considered as the object of gold floatation. However,floatation of free gold exhibits more variables in *** this study, improving gold recovery of a Pb-Zn sulfide ore from Yunnan Province, China, was investigated. The results show that free gold and auriferous sulfides account for 94.99 % of total gold. Without adding organic acid in floatation, only 82 % recovery of gold could be *** recovery in Au/Pb concentrates increases by 9.29 %with oxalate added and by 7.35 % with citric acid added,respectively, while performances of lead and arsenic nearly keep a constant. A possible reason is that free gold is of wonderful selectivity against pyrite with organic activators.A new method to enhance gold recovery is proposed.

关键词： Gold Improving recovery Pb-Zn sulfide ore Selective activation Organic acid

The symmetry and loading-independency of multiple inclusions enclosing uniform stresses in an infinite elastic plane

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Applied Mathematics and Mechanics(English Edition) 2020年第10期41卷 1493-1496页

作者： Ming dai P.SCHIAVONE State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjing 210016China Department of Mechanical Engineering University of AlbertaEdmontonAlberta T6G 1H9Canada

The identification of multiple interacting inclusions with uniform internal stresses in an infinite elastic matrix subjected to a uniform remote loading is of fundamental importance in the mechanics and design of particulate composite *** anti-plane shear and plane deformations,certain sufficient conditions have been established in the literature which guarantee uniform internal stresses inside multiple interacting inclusions displaying various symmetries when the matrix is subjected to specific uniform remote ***,sufficient conditions which allow for the design of multiple interacting inclusions independent of any specific form of(uniform)remote loading have also been *** this paper,we demonstrate rigorously that,in all cases,these sufficient conditions are also necessary conditions and indeed allow for the identification of all possible collections of such inclusions.

关键词： uniform stress Eshelby’s conjecture multiple inclusion

Hydrodynamic improvement of a goose-head pattern braided reach in lower Yangtze River

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Journal of Hydrodynamics 2019年第3期31卷 614-621页

作者： Wen-hong dai Wei Ding State Key Laboratory of Hydrology- Water Resources and Hydraulic Engineering Nanjing 210098 China College of Water Conservancy and Hydropower Engineering Hohai University Nanjing 210098 China National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety Hohai University Nanjing 210098 China

The Three Gorges Reservoir (TGR) began operation in 2003 with alterations in the natural hydrological regime and with severe environmental impacts. Baguazhou Reach, a goose-head pattern of braided channels in the lower Yangtze River has emerged due to a series of changes in the water and sediment conditions caused by the TGR. This paper makes simulations of the hydrodynamic characteristics under the condition of clear water releasing from the TGR and analyzes the features of deformation within the branches of the reach, as well as predicts the future development of the hydrodynamic improvement and the additional fluvial processes. The results show that the decline of the tributary is mainly due to the weakening of the inflow energy and the channel resistance. The particular protective measures can effectively improve the hydrodynamic performance and the present situation but, they all result in a deflection of the main water flow and increase the local velocity, and over the long term, leading to the deposition in the junction areas, where a special protection is required.

关键词： Braided channel hydrodynamic enhancement

Spin waves in the block checkerboard antiferromagnetic phase

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Chinese Physics B 2012年第2期21卷 509-520页

作者： Lu Feng dai Xi Beijing National Laboratory for Condensed Matter Physics and Institute of PhysicsChinese Academy of SciencesBeijing 100190China

Motivated by the discovery of a new family of 122 iron-based superconductors, we present the theoretical results on the ground state phase diagram, spin wave, and dynamic structure factor obtained from the extended J1-J2 Heisenberg model. In the reasonable physical parameter region of K2Fe4Se5, we find that the block checkerboard antiferromagnetic order phase is stable. There are two acoustic spin wave branches and six optical spin wave branches in the block checker- board antiferromagnetic phase, which have analytic expressions at the high-symmetry points. To further compare the experimental data on neutron scattering, we investigate the saddlepoint structure of the magnetic excitation spectrum and the inelastic neutron scattering pattern based on linear spin wave theory.

关键词： spin wave phase diagram superconductivity

Swelling and instability of a gel annulus

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Acta Mechanica Sinica 2015年第5期31卷 627-636页

作者： Xiaoyi Chen Hui-Hui dai Department of Mathematics City University of Hong Kong

We study the swelling of a gel annulus attached to a rigid core when it is immersed in a *** equilibrium states,the free-energy function of the gel can be converted into a strain energy function,and as a result the gel can be treated as a compressible hyperelastic *** methods are used to study the inhomogeneous swelling in order to obtain the leading-order *** analytical insights are then *** of the compressive hoop stress in this state,at some stage instability can occur,leading to wrinkles in the *** incremental deformation theory in nonlinear elasticity is used to conduct a linear bifurcation analysis for understanding such *** specifically,the critical loading for the onset of a wrinkled state is *** discussions on the behaviors of various physical quantities in this critical state are *** is found that the critical mode number,while insensitive to the material parameters,is greatly influenced by the ratio of the inner and outer radii of the ***,an interesting finding is that the critical swelling ratio is an increasing function of this geometrical parameter,which implies that a thin annulus is more likely to be unstable than a thick one.

关键词： Gel Wrinkle Linear bifurcation analysis

川芎嗪含药血清通过抑制抗氧化能力在肝癌HepG2细胞中发挥抗肿瘤作用

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医学分子生物学杂志 2025年第1期22卷 35-40页

作者：张义芳戴毅遂宁市中心医院肝胆外科四川省遂宁市629000

目的探究川芎嗪(tetramethylpyrazine,TMP)含药血清对肝癌细胞增殖的影响及其机制。方法制备SD大鼠0、30、60、120 mg/kg TMP含药血清,并分别处理HepG2细胞,克隆形成和CCK-8法检测HepG2细胞的增殖;流式细胞术检测HepG2细胞周期和凋亡,流... 详细信息

目的探究川芎嗪(tetramethylpyrazine,TMP)含药血清对肝癌细胞增殖的影响及其机制。方法制备SD大鼠0、30、60、120 mg/kg TMP含药血清,并分别处理HepG2细胞,克隆形成和CCK-8法检测HepG2细胞的增殖;流式细胞术检测HepG2细胞周期和凋亡,流式JC-1检测HepG2细胞线粒体膜电位变化,蛋白质印迹检测HepG2细胞中PCNA、P27、cleaved caspase-3(cas-3),Bax,Bcl-2和Cyt C的表达;试剂盒检测HepG2细胞中SOD和MDA的含量;2,7-二氯二乙酸酯(DCFH-DA)测定HepG2细胞中活性氧(reactive oxygen species,ROS)的产生。结果与对照组比较,TMP 60、120 mg/kg组细胞增殖能力受抑制,细胞周期受阻滞;凋亡率明显升高;抗氧化能力受抑制。结论TMP可抑制肝癌细胞的增殖,并通过线粒体依赖途径诱导肝癌细胞凋亡,刺激ROS的生成降低癌细胞抗氧化能力,从而抑制肝癌的发展。

关键词：肝癌川芎嗪增殖细胞凋亡线粒体活性氧

POINCARE-LIGHTHILL-KUO METHOD AND SYMBOLIC COMPUTATION

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Applied Mathematics and Mechanics(English Edition) 2001年第3期22卷 261-269页

作者： dai Shi-qiang(戴世强) Shanghai Institute of Applied Mathematics and Mechanics Shanghai University Shanghai 200072 P R China

This paper elucidates the effectiveness of combining the Poincare-Lighthill-Kuo method (PLK method, for short) and symbolic computation. Firstly, the idea and history of the PLK method are briefly introduced. Then, the difficulty of intermediate expression swell, often encountered in symbolic computation, is outlined. For overcoming the difficulty, a semi-inverse algorithm was proposed by the author, with which the lengthy ports of intermediate expressions are first frozen in the form of symbols till the Fnal stage of seeking perturbation solutions. Tn discuss the applications of the above algorithm, the related work of the author and his research group on nonlinear oscillations and waves is concisely reviewed. The computer-extended perturbation solution of the Duffing equation shows that the asymptotic solution obtained with the PLK method possesses the convergence radius of 1 and thus the range of validity of the solution is considerably enlarged. The studies on internal solitary waves in stratified fluid and on the head-on collision between two solitary waves in a hyperelastic rod indicate that by means of the presented methods, very complicated manipulation, unconceivable in hand calculation, can be conducted and thus result in higher-order evolution equations and asymptotic solutions. The examples illustrate that the algorithm helps to realize the symbolic computation on micro-commputers. Finally, it is concluded that,vith the aid of symbolic computation, the vitality of the PLK method is greatly. Strengthened and at least for the solutions to conservative systems of oscillations and waves, it is a powerful tool.

关键词： PLK method perturbation methods symbolic computation intermediate expression swell semi-inverse algorithm

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基于多目标平衡优化器的共享储能容量优化

软件工程 2025年第1期28卷 8-13页

作者：代斌王红蕾贵州大学电气工程学院贵州贵阳550025

随着绿色能源的大量投入使用,对储能装置的需求也相应增加,要求按比例配套投入,以有效应对电网供需双侧的不确定性,这带来了投资成本过高和回收周期过长的问题。为了应对绿色能源广泛应用带来的储能挑战,提出了一种多微电网储能装置共... 详细信息

随着绿色能源的大量投入使用,对储能装置的需求也相应增加,要求按比例配套投入,以有效应对电网供需双侧的不确定性,这带来了投资成本过高和回收周期过长的问题。为了应对绿色能源广泛应用带来的储能挑战,提出了一种多微电网储能装置共享模型,旨在显著减少整体储能容量的需求。为实现这一目标,设计了一种双层优化方法,并提出了一种多目标平衡优化器用以求解上层模型,避免结果陷入局部最优。通过数据实验验证,与传统的分布式储能方式相比,多微电网储能装置共享模型使系统所需的储能容量降低了43.30%。同时,算法对比结果表明,所提多目标优化算法具有足够的竞争力。

关键词：双侧不确定性共享储能模型多目标优化算法平衡优化器储能容量优化可再生能源消纳率

Amorphous hybrid tungsten oxide–nickel hydroxide nanosheets used as a highly efficient electrocatalyst for hydrogen evolution reaction

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Nano Research 2024年第4期17卷 2499-2508页

作者： Chao Lyu Chenghai dai Yiwei Tan State Key Laboratory of Materials-Oriented Chemical Engineering School of Chemistry and Chemical EngineeringNanjing Tech UniversityNanjing 211816China

There are more challenges for alkaline hydrogen evolution reaction(HER)via simultaneously expediting the electron-coupled water dissociation process(Volmer step)and the following electrochemical H_(2) desorption(Heyrovsky step).Hybrid amorphous electrocatalysts are highly desirable for efficient hydrogen evolution from water-alkali electrolyzers due to the bifunctionality for the different elementary steps of HER and optimal interactions with water molecules and the reactive hydrogen intermediates(Had).Herein,the synthesis of amorphous hybrid ultrathin(tungsten oxide/nickel hydroxide)hydrate(a-[WO_(3)/Ni(OH)_(2)]·0.2H_(2)O)nanosheets on nickel foam(NF)for efficient alkaline HER is *** structural and composition features of a-[WO_(3)/Ni(OH)_(2)]·0.2H_(2)O are characterized in *** resulting a-[WO_(3)/Ni(OH)_(2)]·0.2H_(2)O/NF electrocatalyst with the synergistic effect of both hybrid components for the HER elementary steps shows greatly improved the activity and durability for the HER with a low overpotential of-41 and-163 mV at-10 and-500 mA·cm^(-2),respectively,a Tafel slope as low as-72.9 mV·dec^(-1),and long-term stability of continuous electrolysis for at least 150 h accompanying by inappreciable overpotential change in 1 M *** the hybrid a-[WO_(3)/Ni(OH)_(2)]·0.2H_(2)O,Ni(OH)_(2) and WO_(3) moieties are separately responsible for accelerating dissociative adsorption of water and weakening Had adsorption strength,which is beneficial to the improvement of the alkaline HER activity.

关键词： amorphous nanomaterial bimetallic electrocatalyst tungsten oxide ultrathin nanosheet hydrogen evolution reaction