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Effect of deep oxidation of chalcopyrite on surface properties and flotation performance

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International Journal of Mining Science and Technology 2022年第4期32卷 907-914页

作者： Qingyun Luo Qing Shi dezhi liu Binbin Li Saizhen Jin School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083China Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic Calcium-containing Mineral Resources Central South UniversityChangsha 410083China

In this study, chalcopyrite was oxidized in hydrogen peroxide(H_(2)O_(2)) solutions of different concentrations to simulate different degrees of oxidation in real ores, and the effects of H_(2)O_(2) treatment on chalcopyrite surface properties and flotation performance were investigated by surface analysis techniques and floatation experiments, which implied the reason for the poor grade and recovery of oxidized chalcopyrite concentrate in the production process of the ore. Flotation results showed that when the concentration of H_(2)O_(2) increased from 0%(by weight) to 5%, the flotation recovery of chalcopyrite decreased ***, with increasing H_(2)O_(2) concentration from 5% to 30%, chalcopyrite recovery improved relatively to different degrees with different collector concentrations. Analyses of X-ray photoelectron spectroscopy(XPS) and inductively coupled plasma-atomic optical emission spectrophotometry(ICP-OES) results indicated that the pretreatment with H_(2)O_(2) caused that hydrophilic substance formed on chalcopyrite surface with the dissolution of copper ions, and the dissolution amount of copper increased with the increase of H_(2)O_(2) concentration. UV–visible spectrophotometer and Fourier transform infrared spectrum(FTIR) studies indicated that the pretreatment of chalcopyrite with H_(2)O_(2) had little effect on the adsorption amount of potassium butyl xanthate(PBX) on chalcopyrite surface. However, due to the dissolution of copper ions, PBX interacted with chalcopyrite mainly as buthyl dixanthogen(BX)_(2).

关键词： Chalcopyrite Surface oxidation Flotation Surface analysis

Petroleum in the Jurassic Reservoirs within the Eastern Fukang Sub-depression,Junggar Basin,NW China:Correlation and Source Rock

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Acta Geologica Sinica(English Edition) 2023年第3期97卷 777-795页

作者： CHENG Bin liu Hua ZHANG Kuihua REN Xincheng MENG Xiangyu liu dezhi Shandong Provincial Key Laboratory of Deep Oil and Gas China University of Petroleum(East China)QingdaoShandong 266580China Shandong Provincial Key Laboratory of Reservoir Geology China University of Petroleum(East China)QingdaoShandong 266580China Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and TechnologyQingdaoShandong 266071China Sinopec Shengli Oilfield Company DongyingShandong 257000China

The origin and source of the petroleum in the Jurassic reservoirs within the eastern Fukang sub-depression were geochemically *** show thermal maturities matching the peak generation stage,while the condensates are at the early stage of intense *** and condensates may have experienced mild evaporative fractionation,while mixing of severely biodegraded with non-biodegraded oils has *** biomarkers and isotopes,petroleums were classified into GroupⅠ,ⅡandⅢgenetic groups,with GroupⅢfurther divided intoⅢa andⅢb ***Ⅰpetroleum displays heavy carbon isotopes,a strong predominance of pristine over phytane,high C_(19)and C_(20)tricyclic and C_(24)tetracyclic terpanes,low gammacerane,and dominant C_(29)steranes,while GroupⅡshows light carbon isotopes,a predominance of phytane over pristine,high C_(21)and C_(23)tricyclic with low C_(24)tetracyclic terpanes,high gammacerane and dominant C_(27)***Ⅲa petroleum shows mixing compositions of GroupⅠandⅡ,while GroupⅢb displays similar compositions to Group I,but with significantly higher Ts,C_(29)Ts and C_(30)diahopane ***-source rock correlation suggests GroupⅠandⅡpetroleums originate from Jurassic and Permian source rocks,respectively,while GroupⅢa are mixtures sourced from these rocks andⅢb are mixtures from Jurassic and Triassic source rocks.

关键词： biomarkers oil-source rock correlation Jurassic reservoirs Fukang sub-depression Junggar Basin

Based on self-made shale formation simulated artificial cores to evaluate water-based drilling fluids plugging effect technology

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Petroleum Research 2023年第1期8卷 11-17页

作者： Yang Bai Chunyan liu Guojun Li Ren Wang dezhi liu Pingya Luo State Key Laboratory Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu610500China CNPC Engineering Technology R&D Company Limited Beijing102206China

Plugging technology is one of the leading problems in shale gas drilling engineering,as it causes wellbore stability,shale formation collapse,and so *** order to solve these problems,in this paper,we committed to preparing artificial cores whose original permeability was 1.16×10^(−4)mD,which could be used to simulate the shale formation,and established a sealing evaluation method to assess the effect of plugging technology by measuring permeability reduction rate K'.Verified the good reproducibility of the artificial cores through a lot of high temperature and high pressure(HTHP)filtration *** Scanning electron microscopy(SEM)was used to prove that the permeability reduction rate is a scientific method to evaluate the sealing effect.

关键词： Plugging evaluation method Artificial cores Reproducibility Permeability reduction rate

Cross-species recognition of bat coronavirus RsYN04 and cross-reaction of SARS-CoV-2 antibodies against the virus

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Zoological Research 2023年第6期44卷 1015-1025页

作者： Runchu Zhao Sheng Niu Pu Han Yue Gao dezhi liu Chunliang Luo Honghui liu Bo liu Yanli Xu Jianxun Qi Zhihai Chen Weifeng Shi Lili Wu George F.Gao Qihui Wang Institute of Physical Science and Information Anhui UniversityHefeiAnhui 230039China CAS Key Laboratory of Pathogen Microbiology and Immunology Institute of MicrobiologyChinese Academy of SciencesBeijing 100101China College of Veterinary Medicine Shanxi Agricultural UniversityJinzhongShanxi 030801China School of Life Sciences Hebei UniversityBaodingHebei 071002China Center of Infectious Disease Beijing Ditan HospitalCapital Medical UniversityBeijing 100015China Key Laboratory of Etiology and Epidemiology of Emerging Infectious Diseases in Universities of Shandong Shandong First Medical University&Shandong Academy of Medical SciencesTaianShandong 271000China University of Chinese Academy of Sciences Beijing 100049China

Following the outbreak of coronavirus disease 2019(COVID-19),several severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)-related coronaviruses have been *** research has identified a novel lineage of SARS-CoV-2-related CoVs in bats,including RsYN04,which recognizes human angiotensin-converting enzyme 2(ACE2)and thus poses a potential threat to ***,we screened the binding of the RsYN04receptor-binding domain(RBD)to ACE2 orthologs from 52animal species and found that the virus showed a narrower ACE2-binding spectrum than ***,the presence of the T484W mutation in the RsYN04 RBD broadened its *** also evaluated 44 SARS-CoV-2antibodies targeting seven epitope communities in the SARS-CoV-2 RBD,together with serum obtained from COVID-19 convalescents and vaccinees,to determine their cross-reaction against *** showed that no antibodies,except for the RBD-6 and RBD-7 classes,bound to the RsYN04 RBD,indicating substantial immune differences from ***,the structure of the RsYN04 RBD in complex with cross-reactive antibody S43 in RBD-7 revealed a potently broad epitope for the development of therapeutics and *** findings suggest RsYN04 and other viruses belonging to the same clade have the potential to infect several species,including humans,highlighting the necessity for viral surveillance and development of broad anticoronavirus countermeasures.

关键词： SARS-CoV-2-related coronavirus RsYN04 ACE2 Antibody Structure

Design of Five-Axis Camera Stabilizer Based on Quaternion Untracked Kalman Filtering Algorithm

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国际计算机前沿大会会议论文集 2019年第2期 212-213页

作者： Xiaohui Cheng Yu Zhang dezhi liu College of Information Science and Engineering Guilin University of Technology Jiangan Road No.12 Guilin 541000 China Guangxi Key Laboratory of Embedded Technology and Intelligent System Jiangan Road No.12 Guilin 541000 China

A five-axis camera stabilizer based on quaternion unscented Kalman filter algorithm is designed. It combined the unscented Kalman filter algorithm with the quaternion attitude solution and was solved by attitude sensor. By attitude algorithm, the motor in three directions of pitch, heading and roll in the stabilizer was accurately adjusted to control the movement of the three electronic arms. In order to improve the three-axis hand-held camera stabilizer’s performance, and to solve the jitter problem of up-and-down movement not being eliminated, two mechanical anti-shake arms were loaded under the stabilizer to balance the camera’s picture in pitch, roll, heading, and above and below five directions. Movement can maintain a stable effect. The simulation results show that the algorithm can effectively suppress the attitude angle divergence and improve the attitude calculation accuracy.

关键词： Attitude sensor Quaternion Attitude fusion Untracked Kalman filter Five-axis stabilizer

准中4区块侏罗系成藏动力子系统划分及勘探意义

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断块油气田 2020年第2期27卷 149-154页

作者：刘德志中国石化胜利油田分公司勘探开发研究院山东东营257000

准噶尔盆地中部4区块侏罗系是一个下生上储并被区域性封隔层复杂化的成藏动力系统。通过层序地层学研究,结合异常流体压力分析,将侏罗系成藏动力系统进一步划分为3个子系统:顶部头屯河组常压-超压他源开放成藏动力子系统(Ⅰ);中部三工... 详细信息

准噶尔盆地中部4区块侏罗系是一个下生上储并被区域性封隔层复杂化的成藏动力系统。通过层序地层学研究,结合异常流体压力分析,将侏罗系成藏动力系统进一步划分为3个子系统:顶部头屯河组常压-超压他源开放成藏动力子系统(Ⅰ);中部三工河组超压他源半封闭成藏动力子系统(Ⅱ);底部八道湾组高超压自源封闭成藏动力子系统(Ⅲ)。地化分析表明:油气从八道湾组烃源岩中生成之后,在三工河组砂体进行了广泛的侧向运移,并在适当位置聚集成藏;在喜山期,断裂带间歇性开启,油气可突破成藏动力子系统Ⅱ,沿断层运移至成藏动力子系统Ⅲ中进行聚集。这说明头屯河组油气主要来源于经过三工河组长距离侧向运移聚集的古油藏,并非来自深层油源断裂的直接输导。

关键词：成藏动力系统划分侏罗系中部4区块准噶尔盆地

结合空间注意力机制与光流特征的微表情识别方法

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计算机辅助设计与图形学学报 2021年第10期33卷 1541-1552页

作者：刘德志梁正友孙宇广西大学计算机与电子信息学院南宁530004 广西多媒体通信与网络技术重点实验室南宁530004

针对微表情运动的局部性问题,提出一种将深度学习的空间注意力机制与微表情光流特征相结合的微表情识别自动方法.首先,采用帧差法识别缺少峰值帧标记的微表情样本的峰值帧;然后,利用TV-L1光流法提取微表情起始帧与峰值帧之间的光流水平... 详细信息

针对微表情运动的局部性问题,提出一种将深度学习的空间注意力机制与微表情光流特征相结合的微表情识别自动方法.首先,采用帧差法识别缺少峰值帧标记的微表情样本的峰值帧;然后,利用TV-L1光流法提取微表情起始帧与峰值帧之间的光流水平、垂直分量图,并根据光流的水平、垂直分量图导出对应的光流应变模式图;将3个光流图以通道叠加的方式连接起来,构成微表情的光流特征图;最后,在Inception模块搭建的卷积神经网络中设计了一种包含可学习参数的空间注意力单元,使模型在特征提取过程中能够更加关注存在微表情运动的区域.在空间注意力单元中利用3×3和7×7这2种大小的卷积核进行空间注意力的推断,使模型能够综合地考虑不同尺度卷积核的注意力推断结果.实验结果表明,该方法在MEGC2019综合微表情数据集上的识别准确率达到0.788,优于已有的微表情识别方法.

关键词：微表情识别深度学习空间注意力机制光流法卷积神经网络情绪分类

考虑机械功率波动时三/三相感应发电机系统的小扰动分析

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电工技术学报 2007年第11期22卷 29-34页

作者：王东马伟明刘德志海军工程大学电力电子技术研究所武汉430033

为研究机械输入功率波动对三/三相双绕组感应发电机系统运行稳定性的影响,本文在忽略定子变压器电势的前提下建立了简化的等效电路模型。在此模型的基础上,采用线性化处理得到该系统的状态方程。使用赫尔维茨定理得出了系统稳定运行的... 详细信息

为研究机械输入功率波动对三/三相双绕组感应发电机系统运行稳定性的影响,本文在忽略定子变压器电势的前提下建立了简化的等效电路模型。在此模型的基础上,采用线性化处理得到该系统的状态方程。使用赫尔维茨定理得出了系统稳定运行的判据和临界转差频率的计算公式,揭示了系统微变稳定性的物理实质,试验与理论分析的对比表明了所建模型和分析方法的正确性。

关键词：双绕组感应发电机小扰动机械功率波动稳定性

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片梭织机开发高档缎条呢

上海纺织科技 2000年第5期28卷 36-37页

作者：刘德志营口纺织厂 115000

1 前言我厂于80年代末引进112台PU型日本丰田-苏尔泽片梭织机,但一直生产30 Ne系列平布,从未生产过细号的复杂织物.

关键词：片梭织机缎条织物产品开发纯棉复杂组织