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Electrochemical dissolution behavior of gold and its main coexistent sulfide minerals in acid thiocyanate solutions

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Rare Metals 2022年第1期41卷 254-261页

作者： guan le Wen-Juan Li Kun Song Yong-Sheng Song Yong Chen An-Ping Bai Yu Cheng National Engineering Laboratory of Biohydrometallurgy GRINM Group Co.Ltd.Beijing 100088China GRINM Resources and Environment Tech.Co. Ltd.Beijing 101407China General Research Institute for Nonferrous Metals Beijing 100088China School of Chemical and Environmental Engineering China University of Mining and TechnologyBeijing 100083China GRIMAT Engineering Institute Co. Ltd.(GRIMAT)Beijing 101407China Jiangxi Copper Technology Research Institute Co. LtdNanchang 330096China Beijing Vocational College of Labour and Social Security Beijing 102200China Jiangsu East China Mineral Exploration and Development Bureau Nanjing 210007China

Electrochemical tests were developed to investigate the electrochemical dissolution behavior of gold and its main coexistent sulfide minerals in acid thiocyanate *** optimal leaching conditions for gold in acidic thiocyanate system were pH 2,0.15 mol·L^(-1) thiocyanate and 0.2 g·L^(-1)Fe^(3+).Fe^(3+) addition to the acidic thiocyanate system promoted gold dissolution significantly,arsenopyrite dissolution was inhibited,chalcopyrite dissolution was increased,and the dissolution behavior of other associated minerals remained mostly *** made gold and associated mineral leaching *** galvanic corrosion effect of gold and its main coexistent sulfide minerals in an acidic thiocyanate-free system was that the chalcocite,arsenopyrite and pyrite acted as a cathode to reduce anodic gold dissolution;galena as an anode undergoes oxidation to inhibit anodic gold *** was almost no galvanic corrosion behavior between stibnite,yellow sphalerite and black sphalerite and *** addition changed the galvanic corrosion behavior of stibnite and yellow sphalerite in the thiocyanate system,which inhibited anodic gold *** the acidic thiocyanate system in the presence of ferric iron,the arsenopyrite promoted anodic gold dissolution,the chalcocite and gold were mostly free of galvanic corrosion,and the remaining minerals inhibited anodic gold dissolution.

关键词： Acid thiocyanate Ferric iron Electrochemical adsorption Associated mineral

Vulnerable Region-Aware Greybox Fuzzing

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Journal of Computer Science & Technology 2021年第5期36卷 1212-1228页

作者： Ling-Yun Situ Zhi-Qiang Zuo le guan Lin-Zhang Wang Xuan-Dong Li Jin Shi Peng Liu State Key Laboratory for Novel Software Technology Nanjing UniversityNanjing 210023China School of Information Management Nanjing UniversityNanjing 210023China Department of Computer Science University of GeorgiaAthensGA 30602U.S.A. College of Information Sciences and Technology Pennsylvania State UniversityState CollegePA 16802U.S.A

Fuzzing is known to be one of the most effective techniques to uncover security vulnerabilities of large-scale software *** fuzzing,it is crucial to distribute the fuzzing resource appropriately so as to achieve the best fuzzing performance under a limited *** distribution strategies of American Fuzzy Lop(AFL)based greybox fuzzing focus on increasing coverage blindly without considering the metrics of code regions,thus lacking the insight regarding which region is more likely to be vulnerable and deserves more fuzzing *** tackle the above drawback by proposing a vulnerable region-aware greybox fuzzing ***,we distribute more fuzzing resources towards regions that are more likely to be vulnerable based on four kinds of code *** implemented the approach as an extension to AFL named ***-scale experimental evaluations validate the effectiveness and efficiency of RegionFuzz-11 new bugs including three new CVEs are successfully uncovered by RegionFuzz.

关键词： vulnerability detection greybox fuzzing code metrics resource distribution

Magnetic storms in Mercury's magnetosphere

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Science China(Technological Sciences) 2022年第6期65卷 1427-1432页

作者： ZONG QiuGang ZHAO JiuTong LIU JianJun FU SuiYan SUN WeiJie ZHANG Hui le guan RANKIN Robert WEI Yong Institute of Space Physics and Applied Technology Peking UniversityBeijing 100871 China Polar Research Institute of China Shanghai 2000136China Department of Climate and Space Sciences and Engineering University of MichiganAnn Arbor 48109USA Geophysical Institute University of Alaska FairbanksFairbanks 99775USA ITM Laboratory Heliophysics Science DivisionNASA Goddard Space Flight CenterGreenbelt 20771USA Department of Physics University of AlbertaEdmonton T6G2R3Canada Institute of Geology and Geophysics Chinese Academy of SciencesBeijing 100029China

We present evidence of geomagnetic storms in Mercury’s magnetosphere based on MESSENGER magnetic field observations made just before the probe impacted the *** findings answer the question of whether geomagnetic storms can occur in other planetary *** interaction of the solar wind with Mercury’s magnetosphere is known to involve flux transfer events in the dayside magnetosphere,plasmoids and flux ropes in the magnetotail,and substorm-like processes,all of which occur morphologically similar to Earth but with significant *** significantly weaker magnetic field,smaller magnetosphere,and much faster timescale of processes around Mercury,when compared with Earth,enable charged particles to escape its magnetosphere more efficiently through magnetopause shadowing and direct bombard of the *** analysis of MESSENGER’s data during a coronal mass ejection(CME)proves that,despite these substantial differences,a bifurcated ring current can form in Mercury’s magnetosphere that initiates magnetic storms under strong solar wind driving.

关键词： magnetic storm Mercury magnetosphere ring current

WDR62-deficiency Causes Autism-like Behaviors Independent of Microcephaly in Mice

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Neuroscience Bulletin 2023年第9期39卷 1333-1347页

作者： Dan Xu Yiqiang Zhi Xinyi Liu le guan Jurui Yu Dan Zhang Weiya Zhang Yaqing Wang Wucheng Tao Zhiheng Xu Fujian Key Laboratory of Molecular Neurology Institute of NeuroscienceFujian Medical UniversityFuzhou350005China College of Biological Science and Engineering Institute of Life SciencesFuzhou UniversityFuzhou350108China University of Chinese Academy of Sciences Beijing100101China State Key Laboratory of Molecular Developmental Biology CAS Center for Excellence in Brain Science and Intelligence TechnologyInstitute of Genetics and Developmental BiologyChinese Academy of SciencesBeijing100101China Key Laboratory of Brain Aging and Neurodegenerative Diseases School of Basic Medical SciencesFujian Medical UniversityFuzhou350108China

Brain size abnormality is correlated with an increased frequency of autism spectrum disorder(ASD)in *** analysis indicates that heterozygous mutations of the WD repeat domain 62(WDR62)are associated with ***,biological evidence is still *** study showed that Wdr62 knockout(KO)led to reduced brain size with impaired learning and memory,as well as ASD-like behaviors in ***,Wdr62 Nex-cKO mice(depletion of WDR62 in differentiated neurons)had a largely normal brain size but with aberrant social interactions and repetitive ***62 regulated dendritic spinogenesis and excitatory synaptic transmission in cortical pyramidal ***,we revealed that retinoic acid gavages significantly alleviated ASD-like behaviors in mice with WDR62 haploinsufficiency,probably by complementing the expression of ASD and synapse-related *** findings provide a new perspective on the relationship between the microcephaly gene WDR62 and ASD etiology that will benefit clinical diagnosis and intervention of ASD.

关键词： WDR62 Microcephaly Autism spectrum disorder Synapse Retinoic acid

Versatile physiological functions of the Nudix hydrolase family in berry development and stress response in grapevine

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Journal of Integrative Agriculture 2022年第1期21卷 91-112页

作者： WANG Pei-pei WANG Zhao-ke guan le Muhammad Salman HAIDER Maazullah NASIM YUAN Yong-bing LIU Geng-sen leNG Xiang-peng Institute of Grape Science and Engineering College of HorticultureQingdao Agricultural UniversityQingdao 266109P.R.China College of Horticulture Nanjing Agricultural UniversityNanjing 210095P.R.China Qingdao Key Laboratory of Modern Agriculture Quality and Safety Engineering College of HorticultureQingdao Agricultural UniversityQingdao 266109P.R.China

Nudix hydrolases are widely distributed across all classes of organisms and provide the potential capacity to hydrolyze a wide range of organic pyrophosphates. Although Nudix hydrolases are involved in plant detoxification processes in response to abiotic and biotic stresses, the biological functions of Nudix hydrolases remain largely unclear in *** the present study, a total of 25 putative grapevine Nudix hydrolases(VvNUDXs) were identified by bioinformatics analysis and classified into eight subfamilies based to their preferred substrates. Both tandem and segmental duplications were responsible for the evolution and expansion of the NUDX gene family in grapevine. To investigate the regulatory roles of VvNUDX genes during growth and development, as well as in response to abiotic and biotic stresses in grapevine, the expression patterns were revealed in publicly available microarray data. The spatial and temporal expression patterns of the VvNUDX genes indicated that they might play important roles in multiple developmental processes. Transcriptome and qRT-PCR analyses showed that ten VvNUDX genes were specifically expressed in grapevine berries, suggesting potential roles in grapevine berry development. Expression and phylogenetic analyses demonstrated that VvNUDX1 and VvNUDX3 might be involved in terpenoid biosynthesis in grapevine. Furthermore,most VvNUDX genes active toward the ADP-ribose/NADH showed different patterns in response to various abiotic and biotic stresses, such as salinity and drought, as well as different types of biotic treatments, such as Erysiphe necator,Bois Noir phytoplasma and leaf-roll-associated virus-3(GLRaV-3). These results indicated that VvNUDX genes were associated with plant detoxification processes in response to abiotic and biotic stresses, and regulate the disease immunity and resistance pathways. The information obtained here may provide good opportunities to explore the physiological functions of VvNUDX genes in berry d

关键词： grapevine NUDX gene expression berry development stress response

Study on polarized optical flow algorithm for imaging bionic polarization navigation micro sensor

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Optoelectronics letters 2018年第3期14卷 220-225页

作者： guan le LlU Sheng LI Shi-qi LIN Wei ZHAI Li-yuan and CHU Jin-kui. Key Laboratory for Precision and Nona Traditional Machining Technology of Ministry of Education Key Laboratory for Micro/Nano Technology and System of Liaoning Province Dalian University of Technology

At present,both the point source and the imaging polarization navigation devices only can output the angle information,which means that the velocity information of the carrier cannot be extracted from the polarization field pattern *** flow is an image-based method for calculating the velocity of pixel point movement in an ***,for ordinary optical flow,the difference in pixel value as well as the calculation accuracy can be reduced in weak *** imaging technology has the ability to improve both the detection accuracy and the recognition probability of the target because it can acquire the extra polarization multi-dimensional information of target radiation or *** this paper,combining the polarization imaging technique with the traditional optical flow algorithm,a polarization optical flow algorithm is proposed,and it is verified that the polarized optical flow algorithm has good adaptation in weak light and can improve the application range of polarization navigation *** research lays the foundation for day and night all-weather polarization navigation applications in future.

关键词： polarized optical flow algorithm imaging bionic polarization navigation micro sensor

20世纪上半叶中国绘画用透视学研究与讲授方法

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美术学报 2021年第4期 76-80页

作者：关乐上海大学上海美术学院

20世纪受西学东渐的影响,加之我国留学艺术家交流开始频繁,中西方绘画的对比融合达到前所未有的关注高度。因中国传统绘画与西方绘画有着透视法应用差异,所以一时间学者们对西方透视法的研究与传播兴起,较为系统和科学的透视学译著与专... 详细信息

20世纪受西学东渐的影响,加之我国留学艺术家交流开始频繁,中西方绘画的对比融合达到前所未有的关注高度。因中国传统绘画与西方绘画有着透视法应用差异,所以一时间学者们对西方透视法的研究与传播兴起,较为系统和科学的透视学译著与专著成果开始问世,成为学者、画家们必习的内容。

关键词：透视学民国讲授方法

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基于偏振光及红外传感器的辅助定姿方法

中国惯性技术学报 2015年第4期23卷 528-532页

作者：支炜褚金奎关乐大连理工大学精密与特种加工教育部重点实验室大连116024 大连理工大学机械工程学院大连116024

为了满足无人飞行器自主导航需求,提出了一种偏振光及红外传感器辅助惯导定姿方法。该方法选取了姿态四元数和陀螺误差模型构建滤波状态向量,采用偏振光传感器、红外传感器测量的三维姿态角作为量测向量建立卡尔曼滤波模型;融合后的最... 详细信息

为了满足无人飞行器自主导航需求,提出了一种偏振光及红外传感器辅助惯导定姿方法。该方法选取了姿态四元数和陀螺误差模型构建滤波状态向量,采用偏振光传感器、红外传感器测量的三维姿态角作为量测向量建立卡尔曼滤波模型;融合后的最优姿态四元数转换为姿态矩阵反馈至惯性导航系统中,修正位置、姿态信息的解算。在分析了捷联惯导力学编排的基础上,参考常见的惯导系统参数进行了动态仿真。结果表明:偏振光、红外传感器可以有效地修正惯导姿态误差,修正后输出精度与偏振光、红外传感器输出精度相当,分别保持在±0.2°和±1°。提出的新型辅助定姿方法为提高惯导系统精度提供了一种新思路,具有广阔的应用前景。

关键词：偏振光红外传感器四元数卡尔曼滤波捷联惯导系统

Research on a novel imaging bionic polarization navigation sensor for glimmer environment application

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Optoelectronics letters 2018年第4期14卷 257-261页

作者： guan le LI Shi-qi LIU Sheng CHU Jin-kui Key Laboratory for Precision and Nano Traditional Machining Technology of Ministry of Education Key Laboratory for Micro/Nano Technology ahd System of Liaoning Province Dalian University of Technology Dalian 116024 China

Polarization navigation system is a hotspot in the field of bionic navigation. Compared with point source polarized light navigation sensor, the polarization information acquisition method based on image sensor and imaging technology has better robustness, and it can obtain more polarization information. In this paper, an embedded imaging polarization sensor for glimmer environment application is designed and developed. The multi-channel video processing technology of TMS320 DM642 is used to capture the polarization information of charge coupled device(CCD) camera with three channels. The images are processed by digital signal processer(DSP) in real time, and the angle of polarization(AOP) image is calculated simultaneously with an acquisition and calculation speed of 10 frame per second. Sensor can obtain absolute rotation angle, and the AOP image can be displayed on liquid crystal display(LCD). It provides an effective experimental platform for the research of imaging polarization mode navigation device based on embedded system.

关键词：航行传感器极化信息成像技术环境仿生液晶显示器 TMS320 电荷耦合器件