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Mass transfer in heap leaching of weathered crust elution deposited rare earth ore with Al_(2)(SO_(4))_(3) solution

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Journal of Rare Earths 2024年第6期42卷 1175-1181,I0007页

作者： Jingqun yin Dedong Zeng jun Tian Yaqing weng Institute of Applied Chemistry Jiangxi Academy of SciencesNanchang330096China School of Chemistry and Chemical Engineering Nanchang UniversityNanchang330031China

In order to increase efficiency and avoid NH^(4+)-N pollution in the leaching process of weathered crust elution-deposited rare earth ores,the mass transfer in heap leaching with Al_(2)(SO_(4))_(3) solution was simulated with column elution and experimentally *** results indicate that the leaching yield is also up to 99%for leaching with aluminum sulfate instead of ammonium *** optimal flow rate is 60 mL/h,the height equivalent to a theoretical plate(HETP)is 1.29 mm *** peak value position of RE^(3+)is 60 mL/h,Fe^(3+)is 100 mL/h,however,Al^(3+)is 150 mL/h,and the heap leaching process has kinetic separation effect.

关键词： Raree arths Mass transfer Process optimization Heapleaching Weathered crust elution-deposited rare earth ore

Preparation of crystalline rare earth carbonates with large particle size from the lixivium of weathered crust elution-deposited rare earth ores

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International Journal of Minerals,Metallurgy and Materials 2020年第11期27卷 1482-1488页

作者： Jing-qun yin Zhi-qiang Zou jun Tian Institute of Applied Chemistry Jiangxi Academy of SciencesNanchang 330029China School of Resource and Environmental Engineering Jiangxi University of Science and TechnologyGanzhou 341000China

Crystalline rare-earth(RE)carbonates having large particle size were prepared from the lixivium of weathered crust elution-deposited rare-earth ores using the precipitation method with ammonium bicarbonate as the *** chemical composition was studied using elemental and thermogravimetric analyses(TGA),and their structure and morphology were characterized using Fourier transform infrared(FTIR)spectroscopy,X-ray diffraction(XRD),and scanning electron microscopy(SEM).The results demonstrate that the crystalline rareearth carbonate is a hydrated basic carbonate or oxycarbonate and not astable intermediate carbonate in the process of thermal *** particle size of crystalline rare-earth carbonates with large particle size is in the range of 50–200μ*** an RE2O3 content of up to 95wt%,the quality of crystalline rare-earth carbonates is higher compared to the Chinese National Standard(GB/T 28882–2012).The quality of the product is superior to the Chinese National Standard.

关键词： rare-earth ores precipitation crystalline rare-earth carbonate large particle size

D-serine reduces memory impairment and neuronal damage induced by chronic lead exposure

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Neural Regeneration Research 2021年第5期16卷 836-841页

作者： Jian-Zhu Bo Ling Xue Shuang Li Jing-wen yin Zheng-Yao Li Xi Wang jun-Feng Wang Yan-Shu Zhang College of Public Health North China University of Science and TechnologyTangshanHebei ProvinceChina Laboratory Animal Center North China University of Science and TechnologyTangshanHebei ProvinceChina

Although exogenous D-serine has been applied as a neural regulatory intervention in many studies,the role played by D-serine in hippocampal injuries caused by lead exposure remains poorly *** models of chronic lead exposure were established through the administration of 0.05%lead acetate for 8 ***,rats were administered 30 or 60 mg/kg D-serine,intraperitoneally,twice a *** results showed that D-serine treatment shortened the escape latency from the Morris water maze,increased the number of times that mice crossed the original platform location,and alleviated the pathological damage experienced by hippocampal neurons in response to lead *** D-serine administration did not increase the expression levels of the N-methyl-D-aspartate receptor subtype 2B(NR2B)in the hippocampi of lead-exposed rats,60 mg/kg D-serine treatment restored the expression levels of NR2A,which are reduced by lead *** findings suggested that D-serine can alleviate learning and memory impairments induced by lead exposure and that the underlying mechanism is associated with the increased expression of NR2A in the *** study was approved by the Animal Ethics Committee of North China University of Science and Technology,China(approval ***2018155)on December 21,2018.

关键词： D-serine hippocampus lead neurological function N-methyl-D-aspartate poisoning protection repair

First-principles study on the diffusion behavior of Cs and I in Cr coating

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Nuclear Science and Techniques 2024年第6期35卷 177-188页

作者： Shu-ying Lin Xiao-Jing Li Lin-Bing Jiang Xi-jun Wu Hui-Qin yin Yu Ma wen-Guan Liu Sino-French Institute of Nuclear Engineering and Technology Sun Yat-Sen UniversityZhuhai 519082China School of Nuclear Science and Technology University of South ChinaHengyang 421001China

Cs and I can migrate through fuel-cladding interfaces and accelerate the cladding corrosion process induced by the fuel-cladding chemical *** coating has emerged as an important candidate for mitigating this chemical *** this study,first-principles calculations were employed to investigate the diffusion behavior of Cs and I in the Cr bulk and grain boundaries to reveal the microscopic interaction mitigation mechanisms at the fuel-cladding *** interaction between these two fission products and the Cr coating were studied systematically,and the Cs and I temperature-dependent diffusion coefficients in Cr were obtained using Bocquet’s oversized solute-atom model and Le Claire’s nine-frequency model,*** results showed that the Cs and I migration barriers were significantly lower than that of Cr,and the Cs and I diffusion coefficients were more than three orders of magnitude larger than the Cr self-diffusion coefficient within the temperature range of Generation-IV fast reactors(below 1000 K),demonstrating the strong penetration ability of Cs and ***,Cs and I are more likely to diffuse along the grain boundary because of the generally low migration barriers,indicating that the grain boundary serves as a fast diffusion channel for Cs and I.

关键词： First-principles calculation Fuel cladding chemical interaction Cr coating Fission product Diffusion Grain boundary

Adsorption of 17β-estradiol from aqueous solution by raw and direct/pre/post-KOH treated lotus seedpod biochar

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Journal of Environmental Sciences 2020年第1期32卷 10-23页

作者： Ni Liu Yunguo Liu Guangming Zeng Jilai Gong Xiaofei Tan jun wen Shaobo Liu Luhua Jiang Meifang Li Zhihong yin College of Environmental Science and Engineering Hunan UniversityChangsha 410082P.R.China Key Laboratory of Environmental Biology and Pollution Control Hunan UniversityMinistry of EducationChangsha 410082China College of Agriculture Guangxi UniversityNanning 530005China School of Architecture and Art Central South UniversityChangsha 410082China School of Metallurgy and Environment Central South UniversityChangsha 410083China

Five biochars derived from lotus seedpod(LSP)were applied to examine and compare the adsorption capacity of 17β-estradiol(E2)from aqueous *** effect of KOH activation and the order of activation steps on material properties were *** effect of contact time,initial concentration,p H,ionic strength and humic acid on E2 adsorption were investigated in a batch adsorption *** results demonstrated that the pseudo second-order model fitted the experimental data best and that adsorption equilibrium was reached within 20 *** efficiency of E2 removal increased with increasing E2 concentration and decreased with the increase of ionic strength.E2 adsorption on LSP-derived biochar(BCs)was influenced little by humic acid,and slightly affected by the solution p H when its value ranged from 4.0 to 9.0,but considerably affected at p H *** environmental temperature is favorable for E2 ***,π–πinteractions,monolayer adsorption and electrostatic interaction are the possible adsorption *** studies indicated that KOH activation and the order of activation steps had significant impacts on the ***-treated biochar exhibited better adsorption capacity for E2 than direct treated,pretreated,and raw LSP *** biochar at higher temperature improved E2 *** excellent performance of BCs in removing E2 suggested that BCs have potential in E2 treatment and that the biochar directly treated by KOH would be a good choice for the treatment of E2 in aqueous solution,with its advantages of good efficiency and simple technology.

关键词： 17β-estradiol Lotus seedpod derived biochar Activation order Pre-or post-treatment Adsorption

万古霉素联用哌拉西林他唑巴坦致急性肾损伤的研究进展

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药物流行病学杂志 2023年第9期32卷 975-984页

作者：林小青尹文俊周凌云谢悦良汪江林左笑丛遵义医科大学药学院贵州遵义563000 中南大学湘雅三医院药学部长沙410013 中南大学湘雅三医院临床药理中心长沙410013

万古霉素与哌拉西林他唑巴坦联用是临床常见的联合治疗方案,该方案治疗成本较低,可同时覆盖耐甲氧西林金黄色葡萄球菌和假单胞菌,常用于重症监护病房的患者,在严重感染如急性脓毒症患者的一线治疗中发挥着关键作用。但多项临床研究表明... 详细信息

万古霉素与哌拉西林他唑巴坦联用是临床常见的联合治疗方案,该方案治疗成本较低,可同时覆盖耐甲氧西林金黄色葡萄球菌和假单胞菌,常用于重症监护病房的患者,在严重感染如急性脓毒症患者的一线治疗中发挥着关键作用。但多项临床研究表明该联用方案可能会增加急性肾损伤的发生风险,导致治疗失败和住院时间延长,严重时可危及患者生命安全。因此,本研究对万古霉素与哌拉西林他唑巴坦联用致急性肾损伤的流行病学、发病机制和防治措施进行综述,旨在为临床安全使用万古霉素和哌拉西林他唑巴坦提供依据。

关键词：万古霉素哌拉西林他唑巴坦急性肾损伤联合用药

Almost global smooth solutions of the 3D quasilinear Klein-Gordon equations on the product space R^(2)×T

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Science China Mathematics 2024年第12期67卷 2713-2752页

作者： jun Li Fei Tao Huicheng yin Department of Mathematics Nanjing UniversityNanjing 210093China School of Mathematical Sciences and Mathematical Institute Nanjing Normal UniversityNanjing 210023China

In this paper,for the 3D quadratic nonlinear Klein-Gordon equation on the product space R^(2)×T,we focus on the lower bound of the lifespan of the smooth solution with slowly decaying initial *** the size of initial data is bounded by ε_(0)>0,it is shown that a smooth solution exists up to the time C_(0)/20 with0 being sufficiently small and e^(c0)/ε_(0)^(2)>0 being some suitable *** that the solution of the corresponding 3D linear homogeneous Klein-Gordon equation on R^(2)×T only admits the optimal time-decay rate(1+t)−1,from which we generally derive the lifespan of the nonlinear Klein-Gordon equation up to e^(c0/ε0)rather than the more precise e^(c0/ε^(2)0) here.

关键词： quasilinear Klein-Gordon equation almost global solution Z-norm Littlewood-Paley decomposition space-time resonance method energy estimate

Velocity and density contrasts across the Moho interface of Guangdong province in south China constrained by receiver functions

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Earthquake Science 2020年第3期33卷 141-152页

作者： yin-Ping Qian Xu-Zhang Shen Xin Zhang wen-jun Zheng Yue-jun Wang Guangdong Provincial Key Laboratory of Earthquke Early Warning and Safety Diagnosis of Major Projects Guangdong Earthquake AgencyGuangzhou 510070China School of Earth Science and Engineering Sun Yat-sen UniversityGuangzhou 510070China CEA Key Laboratory of Earthquake Monitoring and Disaster Mitigation Technology Guangdong Earthquake AgencyGuangzhou 510070China

The P receiver function includes P-to-SV converted phases and multiple reverberations of the discontinuities in the crust and *** time of these phases is related to the crustal thickness and vp/vs ratio,and the amplitude of these phases is mainly controlled by the velocity and density contrast of *** using H-κstacking method,this work estimated the crustal thickness and vP/vS ratio beneath the stations in the Guangdong province of South *** velocity and density contrast(δβ-δρ)scanning stacking algorithm of the receiver function is applied to constrain the velocity and density contrast of the Moho in Guangdong *** work analyzed the results of the crustal thickness,vp/vS ratio,and the velocity and density contrasts of *** results indicate that the velocity contrast is higher beneath Yangjiang area in western Guangdong province and Nanao area in eastern Guangdong,which has a strong correlation with the distribution of geothermal springs in local areas and the characteristics of high heat *** velocity contrast of Moho has also a good correlation with the vP/vS ratio and the crustal thickness,which indicates that there is a strong material composition contrasts of the Moho in the study *** and density contrasts of Moho in some local area(such as western Guangdong)are somewhat consistent with the seismic activities.

关键词： Moho discontinuity velocity contrast density con—trast receiver function Guangdong province

Physics problems in bio or bioinspired additive manufacturing

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Bio-Design and Manufacturing 2023年第2期6卷 99-102页

作者： jun yin Jin Qian Yong Huang The State Key Laboratory of Fluid Power and Mechatronic Systems School of Mechanical EngineeringZhejiang UniversityHangzhou 310028China Key Laboratory of 3D Printing Process and Equipment of Zhejiang Province School of Mechanical EngineeringZhejiang UniversityHangzhou 310028China Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province Department of Engineering MechanicsZhejiang UniversityHangzhou 310027China Department of Mechanical and Aerospace Engineering University of FloridaGainesvilleFL 32611USA

Additive manufacturing,also known as three-dimensional(3D)printing,has attracted increasing attention due to the innovations in materials science and manufacturing over recent decades[1].Recently,innovations in biocompatible materials and biology have enabled the extension of 3D printing techniques into bioadditive manufacturing,which focuses on the fabrication of 3D engineered native-like tissues/organs[2].Currently,bioadditive manufacturing technologies can be categorized into inkjet-based bioprinting,microextrusion-based bioprinting,digital light processing(DLP)bioprinting,electric field-assisted bioprinting,and fused deposition modeling(FDM),to name a few[3,4](Fig.1).Artificial tissues and organs with delicate structures,such as the heart[5]and liver[6],have been successfully fabricated using various bioadditive manufacturing techniques.

关键词： printing additive organs