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Flotation mechanisms of molybdenite fines by neutral oils

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International Journal of Minerals,Metallurgy and Materials 2018年第1期25卷 1-10页

作者： qing-quan Lin Guo-hua Gu Hui wang You-cai Liu Jian-gang Fu Chong-qing wang Jiangxi Copper Technology Research Institute Co.Ltd. Jiangxi Copper Corporation School of Chemistry and Chemical Engineering Central South University School of Minerals Processing and Bioengineering Central South University

The flotation mechanisms of molybdenite fines by neutral oils were investigated through microflotation test, turbidity measure- ments, infrared spectroscopy, and interracial interaction calculations. The results of the flotation test show that at pH 2-11, the floatability of molybdenite fines in the presence of transformer oil is markedly better than that in the presence of kerosene and diesel oil. The addition of transformer oil, which enhances the floatability of molybdenite fines, promotes the aggregation of molybdenite particles. Fourier transform infrared measurements illustrate that physical interaction dominates the adsorption mechanism of neutral oil on molybdenite. Interracial inte- raction calculations indicate that hydrophobic attraction is the crucial force that acts among the oil collector, water, and molybdenite. Strong hydrophobic attraction between the oily collector and water provides the strong dispersion capability of the collector in water. Furthermore, the dispersion capability of the collector, not the interaction strength role in the flotation system of molybdenite fines. Our findings provide between the oily collectors and molybdenite, has a highly significant insights into the mechanism ofmolybdenite flotation.

关键词： molybdenite fines flotation mechanisms neutral oils interfacial interaction hydrophobic attraction

Evaluation of fault diagnosability for nonlinear uncertain systems with multiple faults occurring simultaneously

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Journal of Systems Engineering and Electronics 2020年第3期31卷 634-646页

作者： LIN Lixiong wang qing HE Bingwei PENG Xiafu School of Mechanical Engineering and Automation Fuzhou UniversityFujian 350000China Department of Automation Xiamen UniversityXiamen 361005China

Up to present,the problem of the evaluation of fault diagnosability for nonlinear systems has been investigated by many ***,no attempt has been done to evaluate the diagnosability of multiple faults occurring simultaneously for nonlinear *** paper proposes a method based on differential geometry theories to solve this *** the evaluation of fault diagnosability for affine nonlinear systems with multiple faults occurring simultaneously is *** deal with the effect of control laws on the evaluation results of fault diagnosability,a design scheme of the evaluation of fault diagnosability is *** the influence of uncertainties on the evaluation results of fault diagnosability for affine nonlinear systems with multiple faults occurring simultaneously is *** numerical simulation results are obtained to show the effectiveness of the proposed evaluation scheme of fault diagnosability.

关键词： fault diagnosability multiple faults occurring simultaneously uncertain affine nonlinear system

On the Influence of Internet Word of Mouth (IWOM) on Consumers＇ Purchase Orientation

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学术界 2013年第5期 261-265页

作者： wang qing Department of International Trade Anhui Business Vocational College Hefei Anhui 231131

The development of the Internet is making IWOM focus of different marketing strategies because of its role in consumer's purchase orientation. Therefore,to guide consumers to rational consumption,some optimizing measures can be taken to improve its utilization efficiency on their purchase decision. This paper plans to explore,through modular modeling method,the main factors that could determine the influence of IWOM on consumers' purchase orientation. It is divided into three key parts. The first part studies the status of IWOM through a mathematical modeling. Part Two probes the solutions. The third part tries to verify with an empirical case the effect of the model in improving the advantage of the positive feedback relationship between the IWOM and its utilization efficiency.

关键词：消费者取向反馈网络市场策略理性消费建模方法数学建模验证模型

Asynchronous H_∞ Control for Unmanned Aerial Vehicles: Switched Polytopic System Approach

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IEEE/CAA Journal of Automatica Sinica 2015年第2期2卷 207-216页

作者： Zhaolei wang qing wang Chaoyang Dong School of Automation Science and Electrical Engineering Beijing University of Aeronautics and Astronautics Beijing Aerospace Automatic Control Institute School of Aeronautical Science and Engineering Beijing University of Aeronautics and Astronautics

This study is concerned with the H∞control for the full-envelope unmanned aerial vehicles (UAVs) in the presence of missing measurements and external disturbances. With the dramatic parameter variations in large flight envelope and the locally overlapped switching laws in flight, the system dynamics is modeled as a locally overlapped switched polytopic system to reduce designing conservatism and solving complexity. Then, considering updating lags of controller's switching signals and the weighted coefficients of the polytopic subsystems induced by missing measurements, an asynchronous H∞control method is proposed such that the system is stable and a desired disturbance attenuation level is satisfied. Furthermore, the sufficient existing conditions of the desired switched parameter-dependent H∞controller are derived in the form of linear matrix inequality (LMIs) by combining the switched parameter-dependent Lyapunov function method and average dwell time method. Finally, a numerical example based on a highly maneuverable technology (HiMAT) vehicle is given to verify the validity of the proposed method. © 2014 Chinese Association of Automation.

关键词： Flight envelopes Linear matrix inequalities Lyapunov functions Numerical methods Robust control Robustness (control systems) Unmanned aerial vehicles (UAV) Vehicles

Effect of celecoxib on improving depression:A systematic review and meta-analysis

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World Journal of Clinical Cases 2022年第22期10卷 7872-7882页

作者： Zhi wang Qiao Wu qing wang Integrated Traditional Chinese Medicine&Western Medicine Department Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030Hubei ProvinceChina Department of Neurology Tongji HospitalHuazhong University of Science and TechnologyWuhan 430030Hubei ProvinceChina Department of Rehabilitation Center of Wuhan Puren Hospital Wuhan University of Science and TechnologyWuhan 430080Hubei ProvinceChina

BACKGROUND Anti-inflammation drugs were uncovered to be a potential therapy for *** as a selective COX2 inhibitor is also one anti-inflammation *** is widely used in the clinic,which is well known by medical *** is uncertain whether celecoxib has efficacy in improving *** To estimate the effect of celecoxib on improving *** All literature was searched until *** databases included PubMed,OVID database,Cochrane library,Web of Science,CNKI,*** database and Wanfang *** random effects model was used to estimate the standardized mean differences with 95%*** determined diagnostic criteria,studies containing patients with depression in the celecoxib group and the control group were included in the *** primary outcome measures were set for depression scale *** Twenty-nine randomized controlled studies were included in the meta-analysis(including 847 subjects with depression and 810 control subjects).The metaanalysis showed that celecoxib had an effect of *** the same time,heterogeneity was observed(I2=82.1%,P=0.00),and meta-regression was implemented to estimate the source of heterogeneity,which showed that the type of depression scale and depression type may lead to the *** analysis with respect to depression scale and depression type suggested that depression type was the possible main source of ***,Egger’s test,Begg’s test,funnel plot and Doi plot was implemented,and publication bias was found to be ***,the trim and fill method was used to estimate the influence of publication bias on the outcome of the meta-analysis,which showed that the outcome of the meta-analysis was *** analysis was estimated by deleting a study one by one,and the outcome of the meta-analysis was significantly *** quality of all randomized controlled trial studies was assessed by risk of bias,

关键词： Celecoxib Depression Systematic review Meta-analysis Inflammation

Fabrication and characterization of in situ AlN–TiN/Al composite ribbons

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Rare Metals 2015年第9期34卷 645-649页

作者： Kui wang Chun-Xiang Cui Qian wang qing-Zhou wang Hao wang School of Materials Science and Engineering Hebei University of Technology Key Laboratory for New Type of Functional Materials Hebei University of Technology

The conventional wisdom is that the distribution and sizes of reinforcements, as well as the bonding strength of the matrix–reinforcement interface tend to be the crucial factors in determining the resulting properties of composites: the optimum mechanical properties are likely to be achieved when fine and thermally stable reinforcing particles are homogeneously distributed in a metal *** this study, in situ AlN–TiN/Al composite ribbons were successfully synthesized through plasma jet and subsequent melt-spinning method. The distribution and sizes of the particles in the ribbon were systematically *** average grain sizes of AlN and TiN in the AlN–TiN/Al composite ribbon are determined to be 27.7 and 29.6 nm,respectively. Moreover, analysis by scanning electron microscopy(SEM) results reveal that, compared with the AlN–TiN/Al bulk composite, particles like AlN and TiN could be far more homogeneously distributed in the matrix of the ribbon counterpart. In addition, the reinforcing effect of in situ nanoparticles, including AlN and TiN, was discussed as well.

关键词： Melt-spinning Reinforcing effect Nanoparticles

Analysis and forecasts of investment scale and structure in upstream sector for oil companies based on system dynamics

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Petroleum Science 2011年第1期8卷 120-126页

作者： Zhang Baosheng wang qing School of Business China University of PetroleumBeijing 102249China

Oil and gas exploration and production is the most important and key segment in the whole business chain of the petroleum ***,oil companies always put much emphasis on making scientific and reasonable decisions about investment scale and structure in the upstream sector,so that they can minimise business risks and obtain high *** to the system dynamics theories and methods and based on the actual results from an oil company＇s practice in China,a system dynamics model is built in this paper for analyzing and forecasting the upstream investment scale and structure for an oil *** model was used to analyze the investment effect of a large oil company in China, and the results showed that the total upstream investment scale will decline slowly in a short period and the investment proportion of different parts should be adjusted if some influencing factors are taken into *** application practice was compared with the actual data and indicated that the system dynamics（SD） model presented in this paper is a useful tool for analyzing and forecasting of upstream investment scale and structure of oil companies in their investment decisions.

关键词： Oil companies upstream investment scale and structure analysis and forecast system dynamics

Identification and characterization of genes involved in the jasmonate biosynthetic and signaling pathways in mulberry(Morus notabilis)

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Journal of Integrative Plant Biology 2014年第7期56卷 663-672页

作者： qing wang Bi Ma Xiwu Qi qing Guo Xuwei wang Qiwei Zeng Ningjia He State Key Laboratory of Silkworm Genome Biology Southwest University

Jasmonate （JA） is an important phytohormone regulating growth, development, and environmental response in plants, particularly defense response against herbivorous insects. Recently, completion of the draft genome of the mulberry （Morus notabilis） in conjunction with genome sequencing of silkworm （Bombyx mori） provides an opportuni-ty to study this unique plant-herbivore interaction. Here, we identified genes involved in JA biosynthetic and signaling pathways in the genome of mulberry for the first time, with the majority of samples showing a tissue-biased expression pattern. The analysis of the representative genes 12-oxophy-todienoic acid reductase （OPRs） and jasmonate ZIM-domain （JAZs） was performed and the results indicated that the mulberry genome contains a relatively smal number of JA biosynthetic and signaling pathway genes. A gene encoding an＆amp;nbsp;important repressor, MnNINJA, was identified as an alternative splicing variant lacking an ethylene-responsive element binding factor-associated amphiphilic repression motif. Having this fundamental information wil facilitate future functional study of JA-related genes pertaining to mulberry-silkworm interactions.

关键词： Jasmonate mulberry (Morus notabilis) pathway silkwormCitation: wang Q, Ma B, Qi x, Guo Q, wang x, zeng Q, He N (2014)Identification and characterization of genes involved in the jasmonatebiosynthetic and signaling pathways in mulberry (Morus notabilis). J

Numerical Simulation of Dynamic Interaction Between Ice and Wide Vertical Structure Based on Peridynamics

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Computer Modeling in Engineering & Sciences 2019年第11期121卷 501-522页

作者： Bin Jia Lei Ju qing wang College of Shipbuilding Engineering Harbin Engineering UniversityHarbin150001China

In the ice-covered oceanic region,the collision between sea ice and offshore structures will occur,causing the crushing failure of ice and the vibration of *** vibration can result in fatigue damage of structure and even endanger the crews’*** is no doubt that this ice-structure interaction has been noted with great interest by the academic community for a long time and numerous studies have been done through theoretical analysis,experimental statistics and numerical *** this paper,the bond-based Peridynamics method is applied to simulate the interaction between sea ice and wide vertical structures,where sea ice is modeled as elastic-plastic material,with a certain yield condition and failure *** equation of single-degree-of-freedom is considered to investigate the vibration features of the structure during the interaction *** damage of ice,ice forces and vibration responses of structure in the duration are obtained through numerical simulation.A parametric investigation is undertaken to identify the key parameters,such as ice thickness,the diameter of structure and relative velocity that trigger the ice crushing,ice forces and vibration responses of the *** indicate that all three parameters have a positive correlation with the overall level of ice force and vibration ***,a velocity coefficient is proposed to predict the vibration displacement based on its relation with ice speed.

关键词： Ice Peridynamics vertical structure interaction