检索结果-南通市图书馆

Chinese Science Bulletin 1999年第24期44卷 2260-2263页

作者： yingjun ma Congqiang Liu Chinese Acad Sci Inst Geochem State Key Lab Environm Geochem Guiyang 550002 Peoples R China

The granite weathering in Longnan, Jiangxi, is represented by mineralogical changes of feldspars · montmorillonite, illite · kaolinite, halloysite · bauxite, with Na, Ca, Si, P, V, U and Sr being in a mobile state while Ti, Al, Fe, Sc, Th, Zr and Hf remaining relatively conservative. With the exception of Zr/Hf, Nb/Ta, Th/Sc, Zr/Nd and Sm/Nb, changes are notable in ratios between most of the trace elements. Re-distribution of REE and Y has

关键词： granite weathering crust chemical weathering trace elements Longnan Jiangxi.

Improving chitosan-based composite membrane by introducing a novel hybrid functional nano-hydroxyapatite with carboxymethyl cellulose and phytic acid

在线全文

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2024年第6期18卷 1-15页

作者： Liuyun Jiang yingjun ma Shuo Tang Yuqing Wang Yan Zhang Shengpei Su Xiang Hu Jun He National&Local Joint Engineering Laboratory for New Petro-chemical materials and Fine Utilization of Resources Key Laboratory of Chemical Biology&Traditional Chinese Medicine Research(Ministry of Education)College of Chemistry and Chemical EngineeringHunan Normal UniversityChangsha 410081China State Key Laboratory Developmental Biology of Freshwater Fish School of Life ScienceHunan Normal UniversityChangsha 410081China Hunan Provincial Key Laboratory of Regional Hereditary Birth Defects Prevention and Control Changsha Hospital for Matemal&Child Health Care Aiffiliated to Hunan Normal UniversityChangsha 410081China

A functional hybrid nano-hydroxyapatite(carboxymethyl cellulose-phytic acid-n-HA,CMC-PA-n-HA)was prepared by adding CMC and *** results of Fourier transformation infrared spectra,X-ray diffraction,thermal gravimetric analysis and dispersion experiments indicated that the addition of CMC and PA affected the morphology,crystallinity and crystal size of hybrid n-HA,and CMC endowed hybrid n-HA with excellent *** electron microscope results showed that CMC-PA-n-HA nanoparticle could be uniformly dispersed in chitosan(CS)matrix to obtain composite membrane by casting technology,so that the highest tensile strength of CMC-PA-n-HA/CS composite membrane was 69.64%and 144.45%higher than that of CS membrane and n-HA/CS composite membrane,*** angle test showed that CMC-PA-n-HA effectively improved hydrophilicity of the CS *** simulated body fluid immersion results indicated that the CMC-PA-n-HA/CS composite membrane not only exhibited good degradability but also promoted bone-like apatite *** cell proliferation experiments proved that the introduction of PA made the composite membrane have better cell adhesion and proliferation *** tests demonstrated that PA could effectively improve the antibacterial properties of the composite membrane,which is expected to be applied as guide bone tissue regeneration membrane.

关键词： nano-hydroxyapatite chitosan dispersion guide bone tissue regeneration membrane

Chemical weathering crust: A long-term storage of elements and its implications for sediment provenance

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1999年第S2期44卷 107-110页

作者： ma yingjun and LIU Congqiang State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China State Key Laboratory of Environmental Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China

RAKE earth element (REE) and other trace element distributions in fine grained detrital sediments are widely used to characterize source composition of sediments, but ambiguities remain concerning theresponse of sediment composition (e.g. REEs) to provenance characteristics. One of the argumentsis whether significant amounts of REEs and other trace elements are likely to be stored in weathering profiles on the continents. Another ambiguity is which trace element ratios can be transferred with minimal changes from bedrock to weathering profiles and then to sediments. In addition, the effects oferosion and chemical weathering on the compositions of sediments remain poorly documented A major A major goal of this research is to investigate which elements are likely to be stored in weatheringprofiles, and to evaluate the effects of in situ chemical weathering and erosion on the compositions of siliciclastic sediments.

关键词： weathering profiles rare earth elements trace elemental ratios sediment provenance erosion.

Trace elemental behavior during chemical weathering: A case study of biotite-granitic weathering profile in Longnan, Jiangxi Province, China

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1999年第S2期44卷 130-132页

THE study of chemical weathering processes can provide significant insight into not only the behavior ofmigration, deposition and accumulation of REEs and other elements (e.g. Au, Fe, Al ), but also themechanism of material cycle on the surface of the earth, especially the relationship between detrital sediments and provenance. Lateritic profiles are widespread in southern China, where two kinds of valuable supergene deposit occur. One is "ion-adsorbed" REE ore deposit; the other is lateritic gold ore deposit. This study is to investigate the mobility and fractionation of major and trace elements and mineralogical variations during chemical weathering of biotite granite in Longnan, Jiangxi Province, China, andto provide significant data for a better understanding of the relationships between weathering of

关键词： chemical weathering trace elements rare earth element fractionation biotite-granite.

GEOCHEMISTRY OF ELEMENTS AS EVIDENCE FOR SEDIMENTATION-SUPERIMPOSITION FORMING AISHANG TUNGSTEN DEPOSIT IN JIANGXI PROVINCE

在线全文

学校读者我要写书评

暂无评论

Science in China,Ser.B 1985年第2期28卷 210-224页

作者：刘英俊马东升 Department of Geology Nanjing University

By the study of the trace elements in the Zishan formation of lower Carboniferons occurring in the Aishang mining area and its surroundings, the present paper proves that the Zishan formation is rich in B, Ti, Cu, etc., and contains the derivative tungsten-bearing layers related to local accumulation of the heavy minerals in genesis. The superimposition by the late granite has made the tungsten-bearing layers a strata-bound tungsten deposit. It has been concluded that the fundamental tungsten-bearing formation and the Zishan formation give tungsten and essential associated elements such as 13, Ti and Cu for forming the deposit, while the late granite supplies heat energy and superimposed composition such as Be and F.

关键词： GEOCHEMISTRY OF ELEMENTS AS EVIDENCE FOR SEDIMENTATION-SUPERIMPOSITION FORMING AISHANG TUNGSTEN DEPOSIT IN JIANGXI PROVINCE AS

H_2O in channel of pegmatitic beryl and its hydrogen isotopic composition

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1999年第S2期44卷 38-40页

作者： ZHANG Hui, LIU Congqiang and ma yingjun Open Laboratory of Ore Deposit Geochemistry, Intstitute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China Open Laboratory of Ore Deposit Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China

AT present, it is universally accepted that pegmatite can be crystallized from volatile-rich peraluminousresidual granitic melt in a relatively closed environment from liquidus to solidus. However, there still exist controversies on the properties of magmatic/hydrothermal transition, the presence of an independentfluid-phase and internal evolution in the system of equilibrium, the crystallization temperature of mineralstructural zones, the time and scale of the occurrence of metasomatosis and the process of rock/fluid interaction. The method of crush-leach analysis of fluid inclusions is still widely used in the study of theproperties of magmatic/hydrothermal transition because analysis of single inclusion is limited by the techniques. Thus the result of crush-leach analysis unavoidably encounters the contamination from inclusionsof multi-generations. Recently, Taylor and Giuliani et al. successively provided some important information about the volatile evolution （mainly H2O） of pegmatite and genesis of emerald ore deposits by use

关键词： beryl mineralogy H2O in channel hydrogen isotope.

苏北盆地金湖凹陷阜二段砂岩物性影响因素分析

在线全文

学校读者我要写书评

暂无评论

石油实验地质 2017年第4期39卷 477-483页

作者：马英俊中国石化江苏油田分公司勘探开发研究院江苏扬州225012

利用岩石薄片、铸体薄片、孔渗分析等实验手段,对苏北盆地金湖凹陷阜二段砂岩储层的矿物岩石特征、储层物性特征、孔隙结构特征以及储层物性的主要影响因素进行了相关分析。研究表明,阜二段储层岩石颗粒总体偏细,不同地区岩石成分成熟... 详细信息

利用岩石薄片、铸体薄片、孔渗分析等实验手段,对苏北盆地金湖凹陷阜二段砂岩储层的矿物岩石特征、储层物性特征、孔隙结构特征以及储层物性的主要影响因素进行了相关分析。研究表明,阜二段储层岩石颗粒总体偏细,不同地区岩石成分成熟度均值差别小、范围值都较宽;西部斜坡带储层物性相对较好,其他地区以低孔、低渗—特低渗储层为主;压实和碳酸盐胶结是导致储层物性变差的主要原因;溶蚀作用和油气充注是抑制物性变差、改善储集性能的重要因素。西部斜坡带等地区是储层物性相对较好的有利地区。

关键词：砂岩物性沉积微相成岩作用油气充注阜二段金湖凹陷苏北盆地

在线全文

学校读者我要写书评

暂无评论

连续变焦光学系统的像差自动设计

光学学报 2015年第8期35卷 262-268页

作者：马迎军张葆洪永丰中国科学院长春光学精密机械与物理研究所中国科学院航空光学成像与测量重点实验室吉林长春130033 中国科学院大学北京100049

为了避免连续变焦光学系统中,各组元像差自动设计对设计者经验要求高、计算复杂且计算量大的难点,提出了一种利用差值线性方程组进行像差自动设计的方法,并用此方法设计了一套可见光波段连续变焦光学系统。利用高斯光学计算理想近轴系... 详细信息

为了避免连续变焦光学系统中,各组元像差自动设计对设计者经验要求高、计算复杂且计算量大的难点,提出了一种利用差值线性方程组进行像差自动设计的方法,并用此方法设计了一套可见光波段连续变焦光学系统。利用高斯光学计算理想近轴系统的结构参数;利用差值线性方程组进行系统像差自动设计,使系统的初级像差系数SI、SII与SIII在各焦距位置处近似相等;基于像差自动设计结果计算光学系统的初始结构参数;利用Zemax自动设计软件进行像差校正平衡。优化结果表明：系统可实现20~300 mm的连续变焦,且在截止频率50 lp/mm处,各焦距位置各视场的传递函数（MTF）均大于0.4。因此,应用差值线性方程组法进行像差自动设计,可以简化计算,减少对设计者经验的依赖,并且能够取得良好的像质。

关键词：光学设计连续变焦差值线性方程组像差自动设计可见光谱

在线全文

学校读者我要写书评

暂无评论

干旱区水资源开发及合理利用的几个问题

干旱区研究 2000年第3期17卷 6-11页

作者：樊自立马映军中国科学院新疆生态与地理研究所乌鲁木齐830011 新疆科委遥感中心乌鲁木齐830011

在我国实施西部大开发战略中 ,西北干旱区必须合理开发利用水资源才能确保经济发展和生态安全 ,因此 ,必须重视和解决好以下几个问题 :(1)提高水资源的利用效益 ;(2 )适度开发利用地下水 ;(3)在有条件地区建设山区水利枢纽 ;(4 )确保生... 详细信息

在我国实施西部大开发战略中 ,西北干旱区必须合理开发利用水资源才能确保经济发展和生态安全 ,因此 ,必须重视和解决好以下几个问题 :(1)提高水资源的利用效益 ;(2 )适度开发利用地下水 ;(3)在有条件地区建设山区水利枢纽 ;(4 )确保生态用水 ;(5)防治水质盐化和污染 ;(6 )从长远考虑还需进行跨流域调水。

关键词：干旱区水资源合理利用西部大开发

Pd和Ru分别修饰Co_(3)O_(4)催化剂的制备及其高效氧催化性能研究

在线全文

学校读者我要写书评

暂无评论

稀有金属 2023年第12期47卷 1716-1725页

作者：马英军马传利徐金晓王琳龚良玉王杰青岛农业大学化学与药学院青岛266109

氧催化反应是决定燃料电池和金属-空气电池性能的重要组成部分,然而其反应的动力学滞后性严重制约着电池的发展。为改善氧催化性能,提出原位贵金属修饰策略,分别构筑了Pd修饰Co_(3)O_(4)(Pd-Co_(3)O_(4))和Ru修饰Co_(3)O_(4)(Ru-Co_(3)O... 详细信息

氧催化反应是决定燃料电池和金属-空气电池性能的重要组成部分,然而其反应的动力学滞后性严重制约着电池的发展。为改善氧催化性能,提出原位贵金属修饰策略,分别构筑了Pd修饰Co_(3)O_(4)(Pd-Co_(3)O_(4))和Ru修饰Co_(3)O_(4)(Ru-Co_(3)O_(4))催化剂。两种催化剂表现出独特的多孔结构,且实现了Pd/Ru纳米颗粒的高界面分散,有效提高了催化剂的传质和电化学活性面积,氧催化反应动力学得到了显著改善。此外,Pd-Co_(3)O_(4)的氧还原半波电位高达0.92 V,Ru-Co_(3)O_(4)在10 ma·cm^(-2)电流密度下的析氧电位低至1.55 V,表现出了优异的氧催化性能。基于Pd-Co_(3)O_(4)优异的氧还原催化性能和Ru-Co_(3)O_(4)优异的氧析出催化性能,将二者进行复合作为锌-空气电池(ZABs)氧电极的催化剂层。结果表明,复合催化剂组装的ZABs表现出了优异的电池性能,峰值功率密度高达118.5 mW·cm^(-2),优于Pt/C+RuO2复合催化剂。所报道的贵金属表面修饰策略为制备高贵金属利用率材料以及改善催化剂氧催化性能提供了新的思路方法。

关键词： Pd/Ru修饰Co_(3)O_(4) 氧还原反应氧析出反应锌-空气电池(ZABs)