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943 results on '"Hu, Yuehua"'

206. Molecular-Level CuS@S Hybrid Nanosheets Constructed by Mineral Chemistry for Energy Storage Systems

Author

Li, Sijie, primary, Ge, Peng, additional, Jiang, Feng, additional, Foster, Christopher W., additional, Banks, Craig E., additional, Xu, Wei, additional, Zhang, Yu, additional, Hong, Wanwan, additional, Zhang, Chenyang, additional, Sun, Wei, additional, Hu, Jiugang, additional, Hou, Hongshuai, additional, Hu, Yuehua, additional, and Ji, Xiaobo, additional

Published
2018
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209. Comparison of the reduction of chemical oxygen demand in wastewater from mineral processing using the coagulation–flocculation, adsorption and Fenton processes

Author

Meng, Xiangsong, primary, Wu, Jiangqiu, additional, Kang, Jianhua, additional, Gao, Jiande, additional, Liu, Runqing, additional, Gao, Yuesheng, additional, Wang, Ruolin, additional, Fan, Ruiying, additional, Khoso, Sultan Ahmed, additional, Sun, Wei, additional, and Hu, Yuehua, additional

Published
2018
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215. Capacity design for composite partially restrained steel frame‐reinforced concrete infill walls with concealed vertical slits.

Author

Sun, Guohua, Hu, Yuehua, Gu, Qiang, Wang, Yixin, and Fang, Youzhen

Subjects
STEEL framing, SEISMIC response, CONCRETE walls, STEEL, TIME series analysis
Abstract

Summary: This paper presents an innovative capacity‐based design procedure that aims to achieve the ideal seismic performance for the composite partially restrained (PR) steel frame‐reinforced concrete (RC) infill wall with concealed vertical slits (PSRCW‐CVS). The proposed method adopts the direct capacity design principles and preselected preferred plastic mechanism such that the RC infill wall undergoes ductile failure prior to the other steel components in the event of a rare‐level earthquake (i.e., earthquake with a 2% probability of exceedance in 50 years). Based on the ultimate resisting capacity of RC infill walls, the free‐body diagrams and simplified design formulae for the surrounding steel components, including the vertical boundary element (VBE), horizontal boundary element (HBE), PR connection, and shear connectors, were proposed. To demonstrate the reasonability of the capacity‐based design procedure, a five‐story PSRCW‐CVS structure was designed according to the proposed design method, followed by a series of nonlinear time history analyses. The overall seismic response of this example was evaluated in terms of story displacement, interstory drift ratio, residual story displacement, and residual interstory drift ratio. The proposed method yielded a more uniform interstory drift ratio distribution along the height of the five‐story PSRCW‐CVS structure. Structural damage was controlled by achieving the preselected preferred plastic mechanism. [ABSTRACT FROM AUTHOR]

Published
2021
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216. The Application of Fault Tree Method in Systematic Multiple Spurious Operation Analysis in Fire PSA

Author

Yan Zhen, Li Lin, Hu Yuehua, and Song Lei

Subjects
Fault tree analysis, Engineering, business.industry, Spurious relationship, business, Transfer function, Algorithm
Abstract

Systematic multiple spurious operation review is the important basement of Fire PSA Component Selection and Fire Induced Risk Modeling. It is a task of systematically evaluation of all plant systems and identification of equipments susceptible to potential spurious actuation that may challenge safe shutdown capability via spurious operations, which can ensure that the fire PSA model addresses the impacts of single spurious operations (SSOs) and multiple spurious operations (MSOs). In this paper, different methodologies of systematic multiple spurious operation review are studied and it is found that two methodologies are given in literature published at home and abroad: one methodology is development of comprehensive plant specific MSO list by panel review. This methodology is based on generic list of MSOs combined with plant specific information review. This methodology proposes high requirements for the expert panel and hard to avoid missing of some scenarios. Another methodology is review of all plant systems and components to receive SSOs, and then using MSO matrix to evaluate and encode each unique pair to receive MSOs that disable the system function. This methodology can ensure the integrity of MSO list, but the matrixes are too complicated. In this paper, the fault tree method is employed to improve the matrix method in the MSO evaluation process of the latter methodology. Reactor Coolant System (RCS) is taken as an example to describe the application of this method to CAP1000. Engineering practice shows that the fault tree method can effectively avoid omissions of MSO scenarios, and it is more useful and simple for tertiary or quaternary MSO evaluation, as well as more convenient for further MSO evaluation due to cross system issues. Furthermore, MSO fault trees can be directly called by fire PSA model for evaluation, which can lay a foundation for the follow-up work of fire PSA.

Published
2017

217. Effects of particle size and chain length on flotation of quaternary ammonium salts onto kaolinite

Author

Wu Houqin, Liu Ruohua, Xu Longhua, Dong Fa-qin, Jiang Hao, Wang Zhen, and Hu Yuehua

Subjects
Range (particle radiation), Mineral, Chemistry, Inorganic chemistry, Fraction (chemistry), Crystal structure, chemistry.chemical_compound, Geophysics, Adsorption, Chemical engineering, Geochemistry and Petrology, Kaolinite, Ammonium, Particle size
Abstract

Effects of particle size and chain length on flotation of quaternary ammonium salts (QAS) onto kaolinite have been investigated by flotation tests. Dodecyltrimethylammonium chloride (DTAC) and cetyltrimethylammonium chloride (CTAC) were used as collectors for kaolinite in different particle size fractions (0.075 ~ 0.01 mm, 0.045 ~ 0.075 mm, 0 ~ 0.045 mm). The anomalous flotation behavior of kaolinite have been further explained based on crystal structure considerations by adsorption tests and molecular dynamics (MD) simulation. The results show that the flotation recovery of kaolinite in all different particle size fractions decreases with an increase in pH. As the concentration of collectors increases, the flotation recovery increases. The longer the carbon chain of QAS is, the higher the recoveries of coarse kaolinite (0.075 ~ 0.01 mm and 0.045 ~ 0.075 mm) are. But the flotation recovery of the finest kaolinite (0 ~ 0.045 mm) decreases with chain lengths of QAS collectors increasing, which is consistent with the flotation results of unscreened kaolinite (0 ~ 0.075 mm). It is explained by the froth stability related to the residual concentration of QAS collector in mineral pulp. In lower residual concentration, the froth stability becomes worse. Within the range of flotation collector concentration, it’s easy of CTAC to be completely adsorbed by kaolinite in the particle size fraction (0–0.045 mm), which led to lower flotation recovery. Moreover, it is interesting that the coarser particle size of kaolinite is, the higher flotation recovery is. The anomalous flotation behavior of kaolinite is rationalized based on crystal structure considerations. The results of MD simulations show that the (001) kaolinite surface has the strongest interaction with DTAC, compared with the (001) face, (010) and (110) edges. On the other hand, when particle size of kaolinite is altered, the number of basal planes and edge planes is changed. It is observed that the finer kaolinite particles size become, the greater relative surface area of edges and the more the number of edges are. It means that fine kaolinite particles have more edges to adsorb fewer cationic colletors than that of coarse kaolinite particles, which is responsible for the poorer floatability of fine kaolinite.

Published
2014

218. Effect of pyrite, elemental sulfur and ferrous ions on EPS production by metal sulfide bioleaching microbes

Author

Shan Zhou, Hui Zhong, Hu Yuehua, Yanping Yang, and Zhi-guo He

Subjects
chemistry.chemical_classification, Materials science, biology, Sulfide, Leptospirillum ferriphilum, Microorganism, Inorganic chemistry, Metals and Alloys, chemistry.chemical_element, engineering.material, Geotechnical Engineering and Engineering Geology, Condensed Matter Physics, biology.organism_classification, Sulfur, Ferrous, Extracellular polymeric substance, chemistry, Bioleaching, Materials Chemistry, engineering, Food science, Pyrite
Abstract

Extracellular polymeric substances (EPS) produced by acidophilic bioleaching microorganisms play an important role in the production of acid mine drainage and metal sulfide bioleaching. EPS mediate the contact between microbial cells and growth substrates, having a pivotal role in organic film formation and bacterium-substratum interactions. The production and chemical composition of EPS produced by seven bioleaching strains grown with different substrates were studied. Analysis of the EPS extracted from these strains indicated that the EPS consisted of carbohydrates, proteins and galacturonic acid. The contents of EPS, carbohydrates, proteins and galacturonic acid of EPS were largely related to the kind of strain used and culture condition. The results show that EPS productions of microbes grown with pyrite were significantly higher than those of microbes grown with sulfur or FeSO4·7H2O. The highest EPS production of the seven acidiphilic strains was (159.43±3.93) mg/g, which was produced by Leptospirillum ferriphilum CBCBSUCSU208015 when cultivated with pyrite.

Published
2014

219. Removal and utilization of calcite existed in scheelite by preparation of calcium sulfate whiskers

Author

Guan, Qingjun, Sun, Wei, Hu, Yuehua, Guan, Changping, Yin, Zhigang, and Zhang, Chenhu

Abstract

In order to eliminate the effect of calcite associated with scheelite on the scheelite flotation, hydrochloric acid was used to dissolve the calcite, and the soaking solution was used to prepare CaSO4whiskers by hydrothermal reaction with sulfuric acid at ambient pressure. First, the condition experiments of preparing CaSO4whiskers by using CaCl2and H2SO4were carried out to optimize reaction parameters of the crystallization process. The optimal conditions were: at 102°C reaction temperature, 0.5mol/L reactant concentration and 60min reaction time. Then based on the condition experiments and considering keeping acid concentration stable for achieving HCl recycling, Calcium sulfate whiskers with the average diameter of 1.41μm and the average aspect ratio of 109 were prepared by the soaking solution after evaporating to half of its volume and 1.0mol/L H2SO4at 102°C for 60min. After ion exchange processing, the filtrate could be used as HCl in the process of HCl dissolution.

Published
2024
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221. Surface modification of ilmenite by a novel surfactant dodecyliminodimethylenediphosphoinc acid and its sequent influence on ilmenite floatability.

Author

Guan, Changping, Yin, Zhigang, Zhai, Jihua, Hu, Yuehua, Chen, Pan, and Sun, Wei

Subjects
ZETA potential, SURFACE active agents, FOURIER transforms, PHOTOELECTRONS, ILMENITE
Abstract

In the study, a novel compound of dodecyliminodimethylenediphosphoinc acid was synthesized, and its adsorption mechanism onto ilmenite surface was investigated by zeta potential, Fourier transform infrared (FTIR) and X-ray photoelectron spectroscop (XPS) measurements. The zeta potential measurement results indicated that dodecyliminodimethylenediphosphoinc acid (DDDA) could adsorb onto ilmenite surface, and the optimum pH range for adsorption was 4–8 (similar to the flotation behavior). The FTIR analyses further confirmed that DDDA chemisorbed onto ilmenite surface and formed metal–DDDA complex, rendering the hydrophobic media for flotation. The XPS results provided strong evidences that DDDA species chemisorbed onto ilmenite surface and reacted with Fe ions rather than Ti ions. [ABSTRACT FROM AUTHOR]

Published
2020
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240. Novel catalysis mechanisms of benzohydroxamic acid adsorption by lead ions and changes in the surface of scheelite particles

Author

Han, Haisheng, primary, Hu, Yuehua, additional, Sun, Wei, additional, Li, Xiaodong, additional, Chen, Kefeng, additional, Zhu, Yangge, additional, Nguyen, Anh V., additional, Tian, Mengjie, additional, Wang, Li, additional, Yue, Tong, additional, Liu, Runqing, additional, Gao, Zhiyong, additional, Chen, Pan, additional, Zhang, Chenyang, additional, Wang, Jianjun, additional, Wei, Zhao, additional, and Wang, Ruolin, additional

Published
2018
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