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Dissolution characteristics of sericite in chalcopyrite bioleaching and its effect on copper extraction

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International Journal of Minerals,Metallurgy and Materials 2017年第4期24卷 369-376页

作者： ying-bo Dong hao Li Hai Lin Yuan Zhang School of Energy and Environmental Engineering University of Science and Technology Beijing Beijing 100083 China

The effects of sericite particle size, rotation speed, and leaching temperature on sericite dissolution and copper extraction in a chalcopyrite bioleaching system were examined. Finer particles, appropriate temperature and rotation speed for Acidithiobacillus ferrooxidans resulted in a higher Al3+dissolution concentration. The Al3+dissolution concentration reached its highest concentration of 38.66 mg/L after 48-d leaching when the sericite particle size, temperature, and rotation speed were −43 μm, 30°C, and 160 r/min, respectively. Meanwhile, the sericite particle size, rotation speed, and temperature can affect copper extraction. The copper extraction rate is higher when the sericite particle size is finer. An appropriately high temperature is favorable for copper leaching. The dissolution of sericite fitted the shrinking core model, 1–(2/3)α–(1–α)2/3= k1t, which indicates that internal diffusion is the decision step controlling the overall reaction rate in the leaching process. Scanning electron microscopy analysis showed small precipitates covered on the surface of sericite after leaching, which increased the diffusion resistance of the leaching solution and dissolved ions. © 2017, University of Science and Technology Beijing and Springer-Verlag Berlin heidelberg.

关键词： Aluminum Bioleaching Copper Dissolution Extraction Leaching Rotation Scanning electron microscopy Shrinkage

Precise Control of Self-assembly in vivo Based on Polymer-Peptide Conjugates

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Chinese Journal of Chemistry 2022年第23期40卷 2815-2824页

作者： Yin-Sheng Xu hao Wang Zeng-ying Qiao CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety CAS Center for Excellence in NanoscienceNational Center for Nanoscience and Technology(NCNST)Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of SciencesBeijing 100190China

The self-assembled nanomaterials based on peptides,which have not only good biocompatibility and low toxicity but also high stability and performance,are increasingly becoming an important way for cancer *** this review,we highlight the progress of in vivo self-assembled polymer-peptide conjugates(PPCs)and their application,showing the recent advances in the development of“in vivo self-assembly”strategy for cancer *** the diverse microenvironments of tumor cells,different responsive assembly strategies(enzyme,pH,redox,temperature,etc.)have been developed to precisely control the assembly at different biological levels,realizing enhanced drug delivery and improved anticancer efficacy.

关键词： Polymer-peptide conjugates Drug design In vivo self-assembly Drug delivery Antitumor agents

Uncertainty assessment of potential evapotranspiration in arid areas, as estimated by the Penman-Monteith method

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Journal of Arid Land 2020年第1期12卷 166-180页

作者： HUA Ding hao Xingming ZHANG ying QIN Jingxiu State Key Laboratory of Desert and Oasis Ecology Xinjiang Institute of Ecology and GeographyChinese Academy of SciencesUrumqi 830011China University of Chinese Academy of Sciences Beijing 100049China

The Penman-Monteith(PM)method is the most widely used technique to estimate potential worldwide ***,current research shows that there may be significant errors in the application of this method in arid areas,although questions remain as to the degree of this estimation error and how different surface conditions may affect the estimation *** address these issues,we evaluated the uncertainty of the PM method under different underlying conditions in an arid area of Northwest China by analyzing data from 84 meteorological stations and various Moderate Resolution Imaging Spectroradiometer(MODIS)products,including land surface temperature and surface ***,we found that when the PM method used air temperature to calculate the slope of the saturation vapor pressure curve,it significantly overestimated the potential evapotranspiration;the mean annual and July–August overestimation was 83.9 and 36.7 mm,***,the PM method usually set the surface albedo to a fixed value,which led to the potential evapotranspiration being underestimated;the mean annual underestimation was 27.5 mm,while the overestimation for July to August was 5.3 ***,the PM method significantly overestimated the potential evapotranspiration in the arid *** difference in estimation was closely related to the underlying surface *** the entire arid zone,the PM method overestimated the potential evapotranspiration by 33.7 mm per year,with an overestimation of 29.0 mm from July to *** most significant overestimation was evident in the mountainous and plain nonvegetation areas,in which the annual mean overestimation reached 5%and 10%,respectively;during July,there was an estimation of 10%and 20%,*** the annual evapotranspiration of the plains with better vegetation coverage was slightly underestimated,overestimation still occurred in July and August,with a mean overestimation of approximately 5%.In order to estimate pote

关键词： Penman-Monteith parameter correction surface temperature albedo Northwest China

An Extreme Gale Event in East China under the Arctic Potential Vorticity Anomaly through the Northeast China Cold Vortex

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Advances in Atmospheric Sciences 2023年第12期40卷 2169-2182页

作者： Wei TAO Linlin ZheNG ying hao Gaoping LIU Anhui Meteorology Observatory Hefei 230031China

Arctic changes influence not only temperature and precipitation in the midlatitudes but also contribute to severe *** study investigates an extreme gale event that occurred on 30 April 2021 in East China and was forced by an Arctic potential vorticity(PV)anomaly *** advection steered by storms contributed to the equatorward propagation of Arctic high PV,forming the Northeast China cold vortex(NCCV).At the upper levels,a PV southward intrusion guided the combination of the polar jet and the subtropical jet,providing strong vertical wind shear and downward momentum transportation to the *** PV anomaly cooled the upper troposphere and the northern part of East China,whereas the lower levels over southern East China were dominated by local warm air,thus establishing strong instability and *** addition,the entrainment of Arctic dry air strengthened the surface pressure gradient by evaporation *** the above mechanism has the potential to improve convective weather forecasts under climate *** study suggests that the more frequent NCCV-induced gale events in recent years are partly due to high-latitude waviness and storm activities,and this hypothesis needs to be investigated using more cases.

关键词： PV anomaly Arctic storm Northeast China cold vortex convection extreme gale

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武汉地区宠物源肠球菌流行情况和耐药性分析

动物医学进展 2025年第1期46卷 81-86页

作者：覃凯莉王文惠吴莹郝海红无华中农业大学农业微生物资源发掘与利用全国重点实验室湖北武汉430070 动物育种与健康养殖前沿科学中心湖北武汉430070 华中农业大学农业农村部畜禽产品质量安全风险评估实验室湖北武汉430070 华中农业大学-深圳营养与健康研究院广东深圳518000 石河子大学动物科技学院新疆石河子832000

为探究武汉市2022年度宠物源肠球菌的流行和耐药情况,对121株宠物源肠球菌利用微量肉汤稀释法测定其对10种抗菌药物的耐药性。结果表明,121株肠球菌对阿米卡星、四环素的耐药率分别为为98.3%、96.7%;其次为红霉素、庆大霉素、环丙沙星... 详细信息

为探究武汉市2022年度宠物源肠球菌的流行和耐药情况,对121株宠物源肠球菌利用微量肉汤稀释法测定其对10种抗菌药物的耐药性。结果表明,121株肠球菌对阿米卡星、四环素的耐药率分别为为98.3%、96.7%;其次为红霉素、庆大霉素、环丙沙星、左氧氟沙星、阿莫西林-克拉维酸;对氨苄西林、利奈唑胺、万古霉素耐药水平较低。有90.1%的菌株对3种及3种以上抗菌药物耐药,有33.0%的菌株对6种及6种以上的抗菌药物耐药。在“同一健康”理念下,通过检测武汉地区宠物源肠球菌耐药性,为临床用药提供依据,分析宠物源细菌的耐药情况及宠物主人和宠物之间细菌传播联系评估其对于公共卫生安全的影响。

关键词：肠球菌宠物源耐药性

miR-137 inhibits melanoma cell proliferation through downregulation of GLO1

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Science China(Life Sciences) 2018年第5期61卷 541-549页

作者： Na Lv Shuai hao Chonglin Luo Alia Abukiwan ying hao Fei Gai Weiwei Huang Lingyun Huang Xueyuan Xiao Stefan B.Eichmüller Dacheng he Key Laboratory of Cell Proliferation and Regulation of Ministry of Education Universities of the Confederated Institute for ProteomicsBeijing Normal University Beijing Engineering and Technology Research Center of Food Additives Beijing Technology and Business University Gene & Care health Technologies Co. Ltd. GMP & T Cell Therapy Unit German Cancer Research Center (DKFZ) College of Sports Northwest Normal University

Late-stage melanoma is refractory to current therapies. MicroRNAs (miRNAs) can modulate many physiological and pathological processes of melanoma. Studies have demonstrated that miR-137 acts as a tumor suppressor by inhibiting the proliferation of melanoma cells through targeting multiple mRNAs. The glyoxalase system member glyoxalase 1 (GLO1) is the principal scavenging enzyme of methylglyoxal (MG), a toxic byproduct of glycolysis. Using 35S in vivo/vitro labelling analysis for dynamic proteomics (SiLAD), we found that miR-137 downregulated the expression of GLO1 in melanoma *** analysis predicted that GLO1 is a direct target of miR-137. This was validated by dual luciferase reporter *** RT-PCR (qRT-PCR) and western blot analysis indicated that miR-137 could decrease endogenous GLO1 ***, siRNA targeting of GLO1 mimicked inhibition of melanoma cell proliferation caused by miR-137 ***-expression of GLO1 was able to restore miR-137-mediated suppression of melanoma cell proliferation. Therefore, these results suggest that miR-137 inhibits the proliferation of melanoma cells by targeting GLO1.

关键词： melanoma miR-137 SiLAD GLO1 cell proliferation

Influence of Piston Number on Churning Losses in Axial Piston Pumps

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Chinese Journal of Mechanical Engineering 2022年第5期35卷 194-207页

作者： ying Li Xing Chen hao Luo Junhui Zhang Jin Zhang School of Mechanical Engineering Yanshan UniversityQinhuangdao 066004China State Key Laboratory of Fluid Power Transmission and Control Zhejiang UniversityHangzhou 310027China

Raising the rotational speed of an axial piston pump is useful for improving its power density;however,the churning losses of the piston increase significantly with increasing speed,and this reduces the performance and efficiency of the axial piston ***,there has been some research on the churning losses of pistons;however,it has rarely been analyzed from the perspective of the piston *** improve the performance and efficiency of the axial piston pump,a computational fluid dynamics(CFD)simulation model of the churning loss was established,and the effect of piston number on the churning loss was studied in *** simulation analysis results revealed that the churning losses initially increased as the number of pistons increased;however,when the number of pistons increased from six to nine,the torque of the churning losses decreased because of the hydrodynamic shadowing *** addition,in the analysis of cavitation results,it was determined that the cavitation area of the axial piston pump was mainly concentrated around the piston,and the cavitation became increasingly severe as the speed *** comparing the simulation results with and without the cavitation model,it was observed that the cavitation phenomenon is beneficial for the reduction of churning *** this study,a piston churning loss test rig that can eliminate other friction losses was established to verify the accuracy of the simulation results.A comparative analysis indicated that the simulation results were consistent with the actual *** addition,this study also conducted a simulation study on seven and nine piston pumps with the same *** simulation results revealed that churning losses of the seven pistons were generally greater than those of the nine pistons under the same *** addition,regarding the same piston number and displacement,reducing the pitch circle radius of piston bores is effective in reducing the churning *** resea

关键词： Axial piston pumps Churning losses Pistons CFD simulations Experimental study

Ti-Zr-Cu-Fe-Sn-Si-Ag-Ta bulk metallic glasses with good corrosion resistance as potential biomaterials

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Rare Metals 2020年第6期39卷 688-694页

作者： ying Liu hao-Jie Wang Shu-Jie Pang Tao Zhang Key Laboratory of Aerospace Materials and Performance(Ministry of Education) School of Materials Science and EngineeringBeihang UniversityBeijing 100191China School of Physics and Nuclear Energy Engineering Beihang UniversityBeijing 100191China Beijing Advanced Innovation Centre for Biomedical Engineering Beihang UniversityBeijing 100191China

Ti47Cu38-xZr7.5Fe2.5Sn2 Si1 Ag2 Tax(x=1-4;at%,the same below)bulk metallic glasses(BMGs)with good bio-corrosion resistance and mechanical properties were fabricated by copper mold *** diameter of the Ti-based BMGs with 1 at%-4 at%Ta was 3 *** Ta-incorporated Ti-based BMGs exhibit higher open current potential and parallel passive current density in comparison with those of Ti-6 Al-4 V alloy in 0.9 wt%NaCl and Hank’s solution,implying their good corrosion *** pitting corrosion potential of the Ti-based BMGs gradually increases up to about 1.25 V with Ta addition increasing up to 4 at%in 0.9 wt%NaCl *** the present Ti-based BMGs,the alloy bearing2 at%Ta exhibits the optimal integration of mechanical properties,including the compressive fracture strength exceeding 2000 MPa,relative low Young’s modulus of98 GPa,plastic strain of 3.4%and high hardness of *** Ta-bearing Ti-based bulk metallic glasses with integration of relative high GFA,good mechanical properties and high bio-corrosion resistance are beneficial for biomedical applications.

关键词： Ti-based alloy Bulk metallic glass Glass forming ability Bio-corrosion resistance Mechanical properties

Controlling hydrogenation of C=C and C=O bonds in cinnamaldehyde using Pt_(1)/Ni and Pt_(1)/Co single-atom alloy catalysts

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Rare Metals 2024年第6期43卷 2859-2868页

作者： Huan-Shi Lan Yi-Da Yang Qing-Di Sun hao Zhang ying Zhang Qian he Ran Chen Guo-Yi Bai Xiao-Hui he Hong-Bing Ji School of Chemistry and Chemical Engineering Guangxi UniversityNanning 530004China Key Laboratory of Bioinorganicand Synthetic Chemistry of Ministry of Education Fine Chemical Industry Research InstituteSchool of ChemistryIGCMESun Yat-sen UniversityGuangzhou510275China UBFC CNRSENSMMFEMTO-ST Institute25030 Besancon CEDEXFrance College of Chemistry and Materials Science Hebei UniversityBaoding 071002China State Key Laboratory Breeding Base of Green-Chemical Synthesis Technology Institute of Green Petroleum Processing and Light Hydrocarbon ConversionCollege of Chemical EngineeringZhejiang University of TechnologyHangzhou 310014China

Selective hydrogenation of C=C and C=O bonds in cinnamaldehyde(CAL)to produce desired products is a challenging task due to the complex conjugate system of the two unsaturated functional *** this study,a simple ball milling method is presented for synthesizing Pt-based single-atom alloy catalysts(SAAs)that can function as a control switch for the selective hydrogenation of CAL into highly valuable products.

关键词： alloy hydrogenation conjugate