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Melting geodynamics reveals a subduction origin for the Purang ophiolite,Tibet,China

Acta Geochimica 2024年第4期43卷 754-773页

作者： Tao Ruan Zhong-Jie Bai Wei-guang Zhu shi-Ji Zheng State Key Laboratory of Ore Deposit Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang 550081China University of Chinese Academy of Sciences Beijing 100049China

The debate regarding whether the Yarlung-Zangbo ophiolite(YZO)on the south of the Qinghai-Tibet Plateau,formed in a mid-ocean ridge(MOR)or a supra-subduction zone(SSZ)setting has remained *** we present petrological,mineralogical,and geochemical data associated with modeling melting geodynamics of the mantle peridotites from the Purang ophiolite in the western segment of the Yarlung-Zangbo Suture Zone(YZSZ)to explore its tectonic *** Purang lherzolites are characterized by the protogranular texture and have abyssal-peridotite-like mineral compositions,including low Cr^(#)(20-30)and TiO_(2) contents(<0.1wt%)in spinel,high Al_(2)O_(3)(2.9wt%-4.4wt%)and CaO(1.9wt%-3.7wt%)contents in orthopyroxene and LREE-depletion in *** of these lherzolites can be modeled by~11%dynamic melting of the DMM source with a small fraction of melt(~0.5%)entrapped within the source,a similar melting process to typical abyssal *** Purang harzburgites are characterized by the porphyroclastic texture and exhibit highly refractory mineral compositions such as high spinel Cr^(#)(40-68),low orthopyroxene Al_(2)O_(3)(<2.2wt%)and CaO(<1.1wt%)*** in these harzburgites are enriched in Sr(up to 6.0 ppm)and LREE[(Ce)N=0.02-0.4],but depleted in Ti(200 ppm,on average)and HREE[(Yb)N<2].Importantly,the more depleted samples tend to have higher clinopyroxene Sr and LREE *** observations indicate an open-system hydrous melting with a continuous influx of slab fluid at a subduction *** modeled results show that these harzburgites could be formed by 19%-23%hydrous melting with the supply rate of slab fluid at 0.1%-1%.The lower clinopyroxene V/Sc ratios in harzburgites than those in lherzolites suggest a high oxidation stage of the melting system of harzburgites,which is consistent with a hydrous melting environment for these *** is therefore concluded that the Purang ophiolite has experienced a transformat

关键词： Melting geodynamics SSZ peridotites MOR peridotites Clinopyroxene Purang ophiolite

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Monitoring of Cell Membrane Microenvironment Based on DNA Nanodevices

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Chemical Research in Chinese Universities 2024年第2期40卷 255-267页

作者： NAN Hexin CAI ming KUANG shi NIE Zhou State Key Laboratory of Chemo/Biosensing and Chemometrics College of Chemistry and Chemical EngineeringHunan Provincial Key Laboratory of Biomacromolecular Chemical BiologyHunan UniversityChangsha410082P.R.China

The cell membrane is a critical barrier for cellular homeostasis,integral to signaling and intercellular communication,and vital for understanding cellular functions and disease *** its microenvironment is crucial for uncovering the molecular basis of physiological and pathological processes associated with the cell membrane,driving the development of bioanalytical toolkits capable of dynamically monitoring the cell surface *** the continuous advancement of functional nucleic acids and dynamic DNA nanotechnology,DNA nanodevices with controllable nanosized geometry,specific molecular recognition,and selective membrane-localization properties offer a versatile platform for probing the cell membrane *** this review,we summarize the current biosensing and membrane-anchoring mechanisms of DNA nanodevices and highlight their use in studying key cell membrane events,including membrane lipid dynamics,transmembrane transport,receptor dimerization,and signal ***,we discuss the challenges and potential future applications of DNA nanodevices in advancing cell membrane biology research and biomedical applications.

关键词： DNA nanodevice Cell membrane Cellular micro-environment Monitoring

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Locally and globally uniform approximations for ruin probabilities of a nonstandard bidimensional risk model with subexponential claims

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Applied Mathematics(A Journal of Chinese Universities) 2024年第1期39卷 98-113页

作者： LIU Zai-ming GENG Bing-zhen WANG shi-jie School of Mathematics and Statistics Central South UniversityChangsha 410083China School of Big Data and Statistics Anhui UniversityHefei 230601China

Consider a nonstandard continuous-time bidimensional risk model with constant force of interest,in which the two classes of claims with subexponential distributions satisfy a general dependence structure and each pair of the claim-inter-arrival times is arbitrarily *** some mild conditions,we achieve a locally uniform approximation of the finite-time ruin probability for all time horizon within a finite *** we further assume that each pair of the claim-inter-arrival times is negative quadrant dependent and the two classes of claims are consistently-varying-tailed,it shows that the above obtained approximation is also globally uniform for all time horizon within an infinite interval.

关键词： bidimensional risk model asymptotic formula subexponential distribution consistently varying tail ruin probability

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Stress corrosion cracking behavior of buried oil and gas pipeline steel under the coexistence of magnetic field and sulfate-reducing bacteria

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Petroleum Science 2024年第2期21卷 1320-1332页

作者： Jian-Yu He Fei Xie Dan Wang guang-Xin Liu ming Wu Yue Qin College of Petroleum Engineering Liaoning Petrochemical UniversityFushun113001LiaoningChina Key Laboratory of Oil and Gas Storage and Transportation Technology in Liaoning Province Fushun113001LiaoningChina State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing100084China PipeChina West East Gas Pipeline Company Shanghai200120China

Magnetic field and microorganisms are important factors influencing the stress corrosion cracking(SCC)of buried oil and gas pipelines. Once SCC occurs in buried pipelines, it will cause serious hazards to the soil environment. The SCC behavior of X80 pipeline steel under the magnetic field and sulfate-reducing bacteria(SRB) environment was investigated by immersion tests, electrochemical tests, and slow strain rate tensile(SSRT) tests. The results showed that the corrosion and SCC sensitivity of X80 steel decreased with increasing the magnetic field strength in the sterile environment. The SCC sensitivity was higher in the biotic environment inoculated with SRB, but it also decreased with increasing magnetic field strength, which was due to the magnetic field reduces microbial activity and promotes the formation of dense film layer. This work provided theoretical guidance on the prevention of SCC in pipeline steel under magnetic field and SRB coexistence.

关键词： Magnetic field Sulfate-reducing bacteria Film layer Stress corrosion cracking Oil and gas pipelines

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基于莫氏指数的中国动态工业用水绩效分析

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系统工程理论与实践 2013年第12期33卷 3237-3242页

作者：石广明王金南毕军湖南省环境保护科学研究院环境规划与政策研究所长沙410004 环境保护部环境规划院环境规划与模拟重点实验室北京100012 南京大学环境学院污染控制与资源化研究国家重点实验室南京210093

基于数据包络分析(data envelopment,analysis,DEA)的全要素水使用效率分析存在两点不足,其一是全要素生产率框架下过度估计了水使用效率;其二是该方法所评价的水使用效率是静态的.利用数据包络分析法,在固定水资源使用的情况下,分析了... 详细信息

基于数据包络分析(data envelopment,analysis,DEA)的全要素水使用效率分析存在两点不足,其一是全要素生产率框架下过度估计了水使用效率;其二是该方法所评价的水使用效率是静态的.利用数据包络分析法,在固定水资源使用的情况下,分析了相对水使用效率;在此基础上结合Malmquist指数,构建了动态水绩效指数,并将该指数分解为水使用效率影响与水使用技术变化影响,运用该绩效指数对1999 2005年中国31个省、市、自治区工业水绩效进行了分析,结果显示,导致水绩效低下的原因主要是由于水使用效率过低.

关键词：动态水使用绩效相对水使用效率数据包络分析(DEA) 分解

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显微定量角膜检查镜的研制

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中华眼科杂志 2006年第3期42卷 263-266页

作者：施明光王琳温州医学院附属第二医院眼科 325027 温州医学院电镜室

本文介绍一种新型角膜检查镜。其原理是根据等量交叉柱面透镜的合成原理制成可变量合成圆柱面透镜,合成柱面透面的轴向不变,并结合暗亮相间的同心圆环和分划板透射照明的角膜反射像形状的调整观察,可定量测量角膜表面的散光度和轴的方... 详细信息

本文介绍一种新型角膜检查镜。其原理是根据等量交叉柱面透镜的合成原理制成可变量合成圆柱面透镜,合成柱面透面的轴向不变,并结合暗亮相间的同心圆环和分划板透射照明的角膜反射像形状的调整观察,可定量测量角膜表面的散光度和轴的方向。本角膜检查镜可用于手术显微镜下眼内手术时角膜散光检测的便携式角膜检查镜,在工作距离0.025m时,可测量的角膜散光度数可达8.50D,测量误差<0.20D。显微定量角膜检查镜结构简单、方便准确,有助于对术眼角膜的散光度数和轴向进行检测和调整。(中华眼科杂志,2006,42:263-266)

关键词：角膜散光检测显微外科手术

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Static recrystallization behaviors and mechanisms of 7Mo super-austenitic stainless steel with undissolved sigma precipitates during double-stage hot deformation

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Journal of Iron and Steel Research International 2024年第2期31卷 475-487页

作者： shi-guang Xu Jin-shan He Run-ze Zhang Fu-cheng Zhang Xi-tao Wang Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing100083China State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao066004HebeiChina Shandong Provincial Key Laboratory for High Strength Lightweight Metallic Materials Advanced Materials InstituteQilu University of Technology(Shandong Academy of Science)Jinan250353ShandongChina

Static recrystallization(SRX)behaviors and corresponding recrystallization mechanisms of 7Mo super-austenitic stainless steel were studied under different deformation *** order of influence of deformation parameters on static recrystallization behaviors,from high to low,is followed by temperature,first-stage strain and strain ***,the effect of holding time on static recrystallization behaviors is significantly controlled by *** addition,with the increase in temperature from 1000 to 1200°C,the static recrystallization mechanism evolves from discontinuous static recrystallization and continuous static recrystallization(cSRX)to metadynamic recrystallization and cSRX,and finally to *** cSRX exists at all *** is because high stacking fault energy(56 mJ m−2)promotes the movement of dislocations,making the deformation mechanism of this steel is dominated by planar slip of *** undissolved sigma precipitates promote static recrystallization through particle-stimulated ***,small strain-induced precipitates at grain boundaries hinder the nucleation of conventional SRX and the growth of recrystallized grains,while the hindering effect decreases with the increase in temperature.

关键词： 7Mo super-austenitic stainless steel Double-stage hot deformation Conventional static recrystallization Metadynamic recrystallization Strain-induced precipitation

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Complete kinetic model for esterification reaction of lauric acid with glycerol to synthesize glycerol monolaurate

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Chinese Journal of Chemical Engineering 2024年第6期70卷 211-221页

作者： Han-Qiao Hu Yue Zhang ming Fan Yong Cai guang-Wen Chu Liang-Liang Zhang Research Center of the Ministry of Education for High Gravity Engineering and Technology Beijing University of Chemical TechnologyBeijing 100029China State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing 100029China Petrochemical Research Institute China National Petroleum CorporationBeijing 102206China

Glycerol monolaurate(GML)is a widely used industrial chemical with excellent emulsification and antibacterial *** direct esterification of glycerol with lauric acid is the main method to synthesize *** this work,the kinetic process of direct esterification was systematically studied using p-toluenesulfonic acid as catalyst.A complete kinetic model of consecutive esterification reaction has been established,and the kinetic equation of acid catalysis was *** isomerization reactions of GML and glycerol dilaurate were *** was found that the reaction was an equilibrium reaction and the reaction rate was faster than the esterification *** kinetic equations of the consecutive esterification reaction were obtained by experiments as k_(1)=(276+92261Xcat)exp(-37720/RT)and k_(2)=(80+4413Xcat)exp(-32240/RT).The kinetic results are beneficial to the optimization of operating conditions and reactor design in GML production process.

关键词： Glycerol monolaurate p-Toluenesulfonic acid Esterification Kinetics Mass transfer

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基于信息自由度采样的信号重构方法研究进展

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电子学报 2012年第8期40卷 1640-1649页

作者：林杰石光明董伟生西安电子科技大学电子工程学院陕西西安710071

有限的采样能力和高分辨的重构需求是现代信号处理中最基本的矛盾.不完全采样(或观测),高分辨重构信号,是信号处理、通信、应用数学等领域的期待解决的问题之一.本文通过回顾现有的不完全采样、高分辨率重构方法的研究成果,提炼出一个... 详细信息

有限的采样能力和高分辨的重构需求是现代信号处理中最基本的矛盾.不完全采样(或观测),高分辨重构信号,是信号处理、通信、应用数学等领域的期待解决的问题之一.本文通过回顾现有的不完全采样、高分辨率重构方法的研究成果,提炼出一个基于信息自由度采样的信号优化重构方法的框架.在此框架中有三个核心方面,信息自由度决定采样率,采样方法确定约束条件,信号特征指导目标函数的建立.本文着重综述采样重构方法有效性的分析手段,评论其优缺点.最后,我们展望基于信息自由度采样的信号重构问题的研究前景,并展示我们的新探索与新成果.

关键词：信息自由度不完全采样高分辨优化重构压缩感知低秩矩阵填充问题

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DNA methylation of SMPD3-based diagnostic biomarkers of NASH and mild fibrosis

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Genes & Diseases 2024年第1期11卷 99-102页

作者： Na Wu Mofan Feng Siran Yue Xinyu shi Nan Tang Yalan Xiong Jianying Wang Lei Zhang Hualing Song Yi shi guang He guang Ji Baocheng Liu Shanghai Innovation Center of Traditional Chinese Medicine Health Service School of Public HealthShanghai University of Traditional Chinese MedicineShanghai 201203China Institute of Digestive Diseases Longhua HospitalShanghai University of Traditional Chinese MedicineShanghai 200032China Bio-X Institutes Key Laboratory for the Genetics of Developmental and Neuropsychiatric DisordersShanghai Jiao Tong UniversityShanghai 200030China Institute for Advancing Translational Medicine in Bone and Joint Diseases School of Chinese MedicineHong Kong Baptist UniversityHong Kong SAR 999077China

Non-alcoholic fatty liver disease(NAFLD)is a liver condition that is widely prevalent across the world.A considerable number of people with NAFLD have the potential to progress to a more severe form of the condition known as nonalcoholic steatohepatitis(NASH),accompanied by bridging *** advancement is more likely if the patient has metabolic risk factors such as obesity or type 2 diabetes that deteriorate over ***,even slight inflammation or fibrosis in NAFLD can significantly increase the likelihood of progression compared to steatosis *** underscores the importance of revising the present methods of monitoring NAFLD patients to ensure early detection and effective management of the disease.

关键词： NAFLD inflammation NASH

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