检索结果-南通市图书馆

Molecular structure of kerogens from source rocks of the Tarim Basin: A study by Py-GC-MS and methylation-Py-GC-MS

Science China Earth Sciences 2005年第3期48卷 313-325页

作者： JIA Wanglu peng ping'an State Key Laboratory of Organic Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China State Key Laboratory of Organic Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China

Flash pyrolysis-gas chromatography-mass spectrometry (Py-GC-MS) and in situ methylation-pyrolysis-gas chromatography-mass spectrometry (methylation-Py-GC-MS) have been employed for a study of molecular structure of kerogens from source rocks of the Tarim Basin. The main products from Py-GC-MS of the Ordovician and Triassic kerogens from the Tarim Basin are n-alkanes and n-alk-1-enes which decrease in relative abundance with in- creased carbon number. The major products from methylation-Py-GC-MS are normal saturated fatty acid methyl esters which show maxima at C16 and C18. These aliphatic compounds are mainly from lipids of planktonic algae. Moreover, there are more abundant long-chain fatty acids (C20-C26) and normal n-alkanes and n-alk-1-enes (C15-C25) in pyrolysates of Triassic kerogens than that of Ordovician kerogens, reflecting the discrepancies in sources of the Triassic kerogens and the Ordovician kerogens. Besides these aliphatic compounds, methoxyl benzoic acid methyl esters were detected only in products from methylation-Py-GC-MS of late Ordovician kerogen TAC1-1, which possibly was the first molecular evidence for the appearance of moss or other terrestrial plants in the Tarim Basin. In addition, the relative intensity of 17β(H)-trisnorhopane, 17 β(H),21 α(H)-30-normoretane and 17 β(H)-moretane is lower, but 17α(H)-trisnorhopane and 17 α(H)-30-norhopane is higher in the pyrolysates of the Ordovician kerogens in comparison with the pyrolysates of the Triassic kerogens. Moreover, Pr-1-ene has been detected in pyrolysates of Triassic kerogens. These differences in pyrolysates consist with maturity of kerogens. In conclu- sion, combination of methylation-Py-GC-MS and Py-GC-MS are useful tools to investigate the molecular structure of geomacromolecules and can be subject to type the organic matter, com- pare the maturity of kerogens and carry out the oil-source correlation.

关键词： methylation-Py-GC-MS, kerogens, molecular structure, maturity, source material, Tarim Basin.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Emissions of C_2-C_(12) hydrocarbons in the Hsuehshan tunnel,Taiwan

引用

Journal of Environmental Sciences 2011年第6期23卷 941-948页

作者： Chia-Hsiang Lai Yen-ping peng Department of Safety Health and Environmental EngineeringCentral Taiwan University of Science and Technology

The concentrations of 56 hydrocarbons from C2 to C12 were measured simultaneously in the southbound bore,the northbound bore and the exhaust air shafts of the Hsuehshan tunnel near Yilan,Taiwan for 12 days during 2007 and 2008.A total of 60 integrated air samples were collected using stainless steel canisters and analyzed using GC/FID and GC/*** five most abundant species in all samples were ethylene,acetylene,isopentane,propylene and *** exit/entrance ratios of total non-methane hydrocarbons（NMHC） concentration were 7.8 and 4.8 for the southbound and northbound bores,***,the exhaust from the vertical shafts a？ects air quality in the *** most abundant species of emission rate（ER） was toluene（21.93-42.89 mg/sec）,followed by isopentane,ethylene,propylene and 1-butene,with ER ranging from 2.50 to 9.31 mg/*** species in the three exhaust air shafts showed that the reactivities of these emissions are similar to those of vehicle ***,the control of emissions in the vertical shafts of the vehicle tunnel will be important in the future.

关键词： tunnel non-methane hydrocarbons vehicle emissions shaft rate

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Nearly golden-ratio order in Ta metallic glass

引用

Chinese Physics B 2020年第4期29卷 360-367页

作者： Yuan-Qi Jiang ping peng Department of Physics Nanchang Normal UniversityNanchang 330032China College of Physics Jilin UniversityChangchun 130012China School of Material Science&Engineering Hunan UniversityChangsha 410082China

The formation of mono-atomic tantalum(Ta)metallic glass(MG)through ultrafast liquid cooling is investigated by ab-initio molecular dynamics(MD)*** is found that there exists nearly golden ratio order(NGRO)between the nearest and second nearest atoms in Ta MG,which has been indirectly confirmed by Khmich et *** Liang et al..The NGRO is another universal structural feature in metallic glass besides the local five-fold symmetry(LFFS).Further analyzing of electronic structure shows that the obvious orientation of covalent bond could be attributed to the NGRO in amorphous Ta at 300 K.

关键词： nearly golden ratio order(NGRO) metallic glass tantalum ab-initio molecular dynamics(MD)simulation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Pyrolysates of raw vitrinites and their residues after CS_2-NMP solvent extraction and its significance for petroleum geology

引用

Chinese Science Bulletin 2006年第17期51卷 2103-2109页

作者： LIU Dayong peng ping'an State Key Laboratory of Organic Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China

Binary solvent (CS2-NMP) has extreme high extraction ability to coals, and it can extract most bitumens out of coals and vitrinites. And large amount of messages on side chains and their distri- bution character in vitrinites should be acquired through flash pyrolysis before and after binary solvent (CS2-NMP) extraction. A few low maturated coals have been selected and vitrinites are handpicked from coals. Then vitrinites have been extracted using different solvents in the order of polarity. Flash pyro- lysis-Gas Chromatography/Mass spectrum has been applied to samples. The result shows that CS2-NMP is efficient for the extraction of vitirnites, giving much higher extraction yield than common solvents. Pro- duction ratio of liquid hydrocarbons in pyrolysates of vitrinites extracted with CS2-NMP is lower than that of raw vitrinites. And relative ratio of each component in pyrolysates has changed apparently. Production ratio of aliphatic hydrocarbons, especially those long chain aliphatics have decreased much after mixed solvent extraction. It shows that bitumens extracted with CS2-NMP have largely contributed to pyrolysates, especially those aliphatics in pyrolysates.

关键词：镜质组 CS2-NMP 干馏物溶剂萃取石油地质学

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Two Labdane Diterpenes from Leonurus heterophyllus

引用

Chinese Chemical Letters 2006年第10期17卷 1321-1324页

作者： Xian ZHANG Guo ping peng School of Pharmacy Shanghai University of Traditional Chinese Medicine Shanghai 201203 Botanical Refinement Engineering Research Center Nanjing University-of Traditional Chinese Medicine Nanjing 210029

Two new labdane diterpenoids named heteronone A （1） and heteronone B （2） were isolated from the aerial parts of Leonurus heterophyllus Sweet. Their structures were established by various spectroscopic means, and t... 详细信息

关键词： Labdane diterpenes leonurus heterophyllus Sweet. X-ray diffraction analysis

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

First-principles calculation of dehydrogenating properties of MgH_2-V systems

引用

Science China(Technological Sciences) 2006年第2期49卷 129-136页

作者： ZHOU Dianwu peng ping LIU Jinshui School of Materials Science and Engineering Hunan University Changsha 410082 China School of Materials Science and Engineering Hunan University Changsha 410082 China School of Materials Science and Engineering Hunan University Changsha 410082 China

Based on experimental results in which VH0.81/MgH2 interface was found during the process of mechanically milling MgH2+5at%V nanocomposite, a VH/MgH2 in- terface is designed and constituted in this work. A first-principles plane-wave pseudopo- tential method based on Density Functional Theory (DFT) has been used to investigate the vanadium alloying effects on the dehydrogenating properties of magnesium hydride, i.e., MgH2. A low absolute value of the negative heat of formation of VH/MgH2 interface compared with that of MgH2 indicates that vanadium hydrides befit to improve the dehydrogenating properties of MgH2. Based on the analysis of the density of states (DOS) and the total valence electron density distribution of MgH2 before and after V alloying, it was found that the improvement of the dehydrogenating properties of MgH2 caused by V alloying originates from the increasing of the valence electrons at Fermi level (EF) and the decreasing of the HOMO-LUMO gap ( Δ E H ?L) after V alloying. The catalysis effect of V on dehydrogenating kinetics of MgH2 may attribute to a stronger bonding between V and H atoms than that between Mg and H atoms, which leads to nucleation of the α-Mg at the VH/MgH2 interface in the MgH2-V systems easier than that in pure MgH2 phase.

关键词： MgH2, first-principles calculation, dehydrogenating properties, electronic structure.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Organic geochemical characteristics of Eocene crude oils from Zhanhua Depression,Bohai Bay Basin,China

引用

Acta Geochimica 2020年第5期39卷 655-667页

作者： Yujiao Zhang Hong Lu Yao-ping Wang Xin Zhan ping'an peng State Key Laboratory of Organic Geochemistry Guangzhou Institute of GeochemistryChinese Academic of SciencesGuangzhou 510640China University of the Chinese Academy of Sciences Beijing 100049China College of Chemistry and Environmental Science Guangdong Ocean UniversityZhanjiang 524088China Geology and Geophysics Program.Missouri University of Science and Technology RollaMO 65409USA

Geochemical studies of crude oil and source rock play an important role in future exploration in Zhanhua *** this study,thirty-one oil samples collected from Shahejie Formation in Zhanhua Depression,Bohai Bay Basin,NE China have been geochemically analyzed and their organic geochemical characteristics have been applied to differentiate groups of *** oil samples can be classified into two families based on multiple biomarker proxies and stable carbon isotopic ***Ⅰis characterized by a low ratio of pristane over phytane(Pr/Ph<0.7),a relatively high ratio of phytane over n-C18(Ph/n-C18),varying ratios of gammacerane over C30 hopane(Ga/C30H)and C22/C21 tricyclic terpane,and a low ratio of C19/C23 tricyclic ***Ⅱis marked by a relatively high Pr/Ph ratio(0.7-1.6),relative low ratios of Ph/n-C18 and C22/C21 tricyclic terpane,and avarying ratio of C19/C23 tricyclic *** familiesⅠandⅡwithin these crude oils can be subdivided into two families based on different values of stable carbon isotopic composition of individual ***,the potential source rocks of oil samples in FamilyⅠand FamilyⅡwere likely derived from the upper Es4 member and Es3 member,respectively,based on the correlation of organic geochemical characteristics of the oils and source *** results of oil-source rock correlation provide insight into the process from oil generation to migration and to final accumulation,providing a better understanding of factors controlling oil-gas distribution for prediction of sweet spots.

关键词： Zhanhua depression Bohai Bay Basin Biomarkers Stable carbon isotopic compositions Crude oil

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Simultaneous Determination of Pt and Pd by First-and Second-Derivative Spectrometry

引用

Rare Metals 1989年第1期9卷 45-49页

作者： Li, Jinhe peng, ping Shi, Huiming Nankai Univ China

This paper has selected the amino-carboxylic complexing agent EDTA and KCl as the competing ligands of palladium and platinum. Their first-and second-derivative spectra with the zero-point method have been simultaneou... 详细信息

关键词： Palladium and Alloys Spectroscopic Analysis

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Abiotic Hydrocarbons Generation Simulated by Fischer-Tropsch Synthesis under Hydrothermal Conditions in Ultradeep Basins

引用

Acta Geologica Sinica(English Edition) 2022年第4期96卷 1331-1341页

作者： ZHAO Zhongfeng LIU Xinran LU Hong peng ping’an State Key Laboratory of Organic Geochemistry Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou 510640China CAS Center for Excellence in Deep Earth Science Guangzhou 510640China University of Chinese Academy of Sciences Beijing 100049China

FTT experiments with water as a hydrogen source and three types of possible carbon sources in the subsurface(diiron nonacarbonyl,siderite and formic acid,representing CO,CO_(2)and a simple organic acid,respectively)were carried out in this *** experimental results showed that n-alkanes with the highest carbon number of C_(33)were produced when CO was used as a carbon source(series A);a variety of polycyclic aromatic hydrocarbons(PAHs)were detected in series B with CO_(2)as a carbon source;gaseous hydrocarbons were also detected with formic acid added(series C).The different products in the three series showed that there were different hydrocarbon generation mechanisms and reaction processes with different carbon *** generation of long-chain n-alkanes in series A provided experimental support for the formation of abiogenic petroleum underground,which was of significance to early membranes on the *** in series B provide experimental support for the possibility of an abiotic source of reduced carbon on other *** carbon isotopes of gaseous hydrocarbons produced by CO exhibited a partial reversed order(δ^(13)C_(1)δ^(13)C_(3)>δ^(13)C_(4)>δ^(13)C_(5)),while the gaseous hydrocarbons produced by CO_(2)and HCOOH showed a positive order(δ^(13)C_(1)<δ^(13)C_(2)<δ^(13)C_(3)<δ^(13)C_(4)<δ^(13)C_(5)).Based on these,the alkylene mechanism and the carbonyl insertion mechanism were used to reasonably explain these characteristics.

关键词： ultra-deep basin FTT carbon isotope reversed order abiogenic hydrocarbons hydrothermal experiments

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Kinetic modeling the effects of primary migration, diffusion and waterwashing on Upper Paleozoic coal-derived gas at the center of Ordos Basin

引用

Chinese Science Bulletin 2004年第S1期49卷 94-100页

作者： SHUAI Yanhua ZOU Yanrong peng ping’an State Key Laboratory of Organic Geochemistry Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou 510640China

Gold reactor pyrolysis system is used to model the gas formation from the Upper Paleozoic coal measures and the results show coal-derived gas characterized with δ13C1 of-33.46‰, δ13C2 of-23.1‰, dryness(C1/C1-4) 85.6%. And then, effects of the post-genetic processes on coal- derived gas are analyzed in turn: (i) About 27% coal-derived gases constituted with more methane are calculated to be lost during diffusion. The residual in reservoir are characterized with almost the same compositions as the original, which suggests faint influence by diffusion (the residual, δ13C1 of -32.78‰, δ13C2 of-23.1‰, C1/C1-4 83%); (ii) Water washing made about 8% coal-formed gases lost and their components and stable carbon isotopes are stable; (iii) In the final, it is speculated that primary migration makes much more wet gas (C2-4) leave in coal measures. The variance of gas dryness induced by this factor is estimated to be about 10%.

关键词： diffusion migration dryness isotopic ratios Ordos Basin Upper Paleozoic coal.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：