检索结果-南通市图书馆

Sulphur-containing Compounds in Sulphur-rich Crude Oils from Hypersaline Lake Sediments and Their Geochemical Implications

引用

Acta Geochimica 1987年第2期6卷 115-126页

作者：盛国英傅家谟 S.C.BRASSELL A.P.GOwAR G.EGLINTON JAAP S.SINNINGHE DAMSTE jan w.de leeuw P.A.SCHENCK Institute of Geochemistry Academia Sinica Institute of Geochemistry Academia Sinica Organic Geochemistry Unit School of Chemistry University of Bristol Bristol U.K. Organic Geochemistry Unit School of Chemistry University of Bristol Bristol U.K. Organic Geochemistry Unit School of Chemistry University of Bristol Bristol U.K. Organic Geochemistry Unit department of Chemistry and Chemical Engineering delft University of Technology delft The Netherlands Organic Geochemistry Unit department of Chemistry and Chemical Engineering delft University of Technology delft The Netherlands Organic Geochemistry Unit department of Chemistry and Chemical Engineering delft University of Technology delft The Netherlands

Three sulphur-rich commercial crude oils have been studied,which contain sulphur as high as up to4—12%.These samples were collected from Tertiary hypersaline lake sediments of the Jianghan Basin,Hubei Province at different depths,but above the oil generation threshold（2200m）.FPD—GC and GC-MSdata show that aromatic fractions of the crude oils are composed of different homologues of sulphur-containing compounds,including long-chain normal alkyl-thiophenes and-thiolanes,long-chainisoprenoid-thiophenes and-thiolanes,and *** is worth noting that the distribution patternsof long-chain alkyl-thiophenes and-thiolanes from two shallow-seated crude oils are quite similar to thoseof normal alkanes showing marked even-odd *** seems that the even-odd predominance ofsulphur-containing compounds decreases with increasing burial depth of the crude *** majorcomponent of aliphatic fraction is phytane,and similarly the major peaks of aromatic fractions also representC20isoprenoid *** preliminary conclusions have been drawn from the above discussion:（1）Abundant sulphur-containing compounds may be used as an indicator of low mature or immature crude oils produced fromhypersaline lake sediments;（2）Sulphur-containing compounds are considered to be early diageneticproducts of reactions between elemental sulphur or sulfides and alkanes or their precursors（phytols,fattyacids,alcohols,etc.）,or of bacterial activities,but not direc■ inputs of organisms.

关键词： Sulphur-containing Compounds in Sulphur-rich Crude Oils from Hypersaline Lake Sediments and Their Geochemical Implications

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Oligodendroglial heterogeneity in health,disease,and recovery:deeper insights into myelin dynamics

引用

Neural Regeneration Research 2025年第11期20卷 3179-3192页

作者： Pieter-jan Serneels Julie D.de Schutter Lies de Groef Lieve Moons Steven Bergmans KU Leuven Leuven Brain InstituteDepartment of BiologyAnimal Physiology and Neurobiology DivisionNeural Circuit Development&Regeneration Research GroupLeuvenBelgium KU Leuven Leuven Brain InstituteDepartment of BiologyAnimal Physiology and Neurobiology DivisionCellular Communication&Neurodegeneration Research GroupLeuvenBelgium

decades of research asserted that the oligodendroglial lineage comprises two cell types:oligodendrocyte precursor cells and ***,recent studies employing single-cell RNA sequencing techniques have uncovered novel cell states,prompting a revision of the existing *** forward,the oligodendroglial lineage should be delineated into five distinct cell states:oligodendrocyte precursor cells,committed oligodendrocyte precursor cells,newly formed oligodendrocytes,myelin-forming oligodendrocytes,and mature *** new classification system enables a deeper understanding of the oligodendroglia in both physiological and pathological *** this uniform terminology will facilitate comparison and integration of data across ***,including the consolidation of findings from various demyelinating models,is essential to better understand the pathogenesis of demyelinating ***,comparing injury models across species with varying regenerative capacities can provide insights that may lead to new therapeutic strategies to overcome remyelination ***,by standardizing terminology and synthesizing data from diverse studies across different animal models,we can enhance our understanding of myelin pathology in central nervous system disorders such as multiple sclerosis,Alzheimer's disease,and amyotrophic lateral sclerosis,all of which involve oligodendroglial and myelin dysfunction.

关键词： animal models demyelination fish mammals multiple sclerosis myelin neurodegeneration oligodendrocytes oligodendroglial lineage remyelination

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

Alzheimer’s in a dish-induced pluripotent stem cell-based disease modeling

引用

Translational Neurodegeneration 2019年第1期8卷 257-269页

作者： Sherida de leeuw Christian Tackenberg Institute for Regenerative Medicine University of ZurichSchlierenSwitzerland Neuroscience Center Zurich University of Zurich and ETH ZurichZurichSwitzerland

Background:Since the discovery of the induced pluripotent stem cell(iPSC)technique more than a decade ago,extensive progress has been made to develop clinically relevant cell culture ***’s disease(AD)is the most common neurodegenerative disease,accounting for approximately two thirds of all cases of *** massively increasing number of affected individuals explains the major interest of research in this disease as well as the strong need for better understanding of disease *** body:IPSC-derived neural cells have been w.dely used to recapitulating key aspects of *** this Review we highlight the progress made in studying AD pathophysiology and address the currently available techniques,such as specific differentiation techniques for AD-relevant cell types as well as 2D and 3D ***,we critically discuss the key challenges and future directions of this field and how some of the major limitations of the iPSC technique may be ***:Stem cell-based disease models have the potential to induce a paradigm shift in biomedical *** particular,the combination of the iPSC technology with recent advances in gene editing or 3D cell cultures represents a breakthrough for in vitro disease modeling and provides a platform for a better understanding of disease mechanisms in human cells and the discovery of novel therapeutics.

关键词： Alzheimer’s disease Induced pluripotent stem cells iPSC-derived neurons iPSC-derived astrocytes iPSCderived microglia Disease modeling

来源：

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

Comparison of Extrapolation and Interpolation Methods for Estimating Daily Photosynthetically Active Radiation(PAR)——A Case Study of the Poyang Lake National Nature Reserve,China

引用

Geo-Spatial Information Science 2010年第4期13卷 235-242页

作者： wU Guofeng jan de leeuw Andrew K. Skidmore LIU Yaolin Herbert H. T. Prins School of Resource and Environmental Science Wuhan University 129 Luoyu Road Wuhan 430079 China Key Laboratory of Geographic Information System of the Ministry of Education Wuhan University 129 Luoyu Road Wuhan 430079 China International Livestock Research Institute (ILRI) P. O. Box 30709 Nairobi 00100 Kenya department of Natural Resources International Institute for Geo-Information Science and Earth Observation P. O. Box 6 Hengelosestraat 99 7500 AA Enschede the Netherlands Resource Ecology Group Department of Environmental Sciences Wageningen University Droevendaalsesteeg 3A 6708 PB Wageningen the Netherlands

Measurements of photosynthetically active radiation （PAR）, which are indispensable for simulating plant growth and productivity, are generally very scarce. This study aimed to compare two extrapolation and one interpolation methods for estimating daily PAR reaching the earth surface within the Poyang Lake national nature reserve, China. The daily global solar radiation records at Nanchang meteorological station and daily sunshine duration measurements at nine meteorological stations around Poyang Lake were obtained to achieve the objective. Two extrapolation methods of PARs using recorded and estimated global solar radiation at Nanchang station and three stations （Yongxiu, Xingzi and Duchang） near the nature reserve were carried out, respectively, and a spatial interpolation method combining triangulated irregular network （TIN） and inverse distance weighting （IDw） was imple- mented to estimate daily PAR. The performance evaluation of the three methods using the PARs measured at Dahuchi Conservation Station （day number of measurement = 105 days） revealed that：（1） the spatial interpolation method achieved the best PAR estima- tion （R2 - 0.89, s.c. = 0.99, F= 830.02, P 〈 0.001 ）; （2） the extrapolation method from Nanchang station obtained an unbiased result （R2 = 0.88, s.c. = 0.99, F = 745.29, P 〈 0.001）; however, （3） the extrapolation methods from Yongxiu, Xingzi and Duchang stations were not suitable for this specific site for their biased estimations. Considering the assumptions and principles supporting the extrapolation and interpolation methods, the authors conclude that the spatial interpolation method produces more reliable results than the extrapolation methods and holds the greatest potential in all tested methods, and more PAR measurements should be recorded to evaluate the seasonal, yearly and spatial stabilities of these models for their application to the whole nature reserve of Poyang Lake.

关键词： photosynthetically active radiation (PAR) extrapolation interpolation triangulated irregular network (TIN) inverse distance weighting (IDw)

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

water harvesting experiences from the southern and eastern Africa rainwater network

引用

Journal of Southeast University(English Edition) 2014年第2期30卷 186-191页

作者： Maimbo M.Malesu jan de leeuw Alex Oduor The world Agroforestry Centre ( ICRAF) Nairobi 30677-00100 Kenya

This paper shares experiences of the southern and eastern Africa rainwater network on rainwater *** also shares the lessons drawn from policy research awareness creation and networking building of national networks and assessment of promising water harvesting techniques in the Sub-Saharan *** concerted promotional effort of the southern and eastern Africa rainwater network has resulted in the general acceptance of rainwater harvesting as a viable option for boosting domestic water supply agricultural production and environmental *** date twelve nationally registered rainwater harvesting associations have been established which are providing leadership and capacity building in rainwater *** and donors are also aligning their policies towards providing increased financial institutional and technical support for upscaling rainwater-harvesting techniques. This paper concludes that diligent land and water management is necessary for yielding the highest benefits from *** addition to enabling policies and institutions there must be ample budgetary support to increase adoption of the technology.

关键词： rainwater harvesting blue water water scarcity policy water harvesting techniques SearNet green water

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

The ADV/ASV AATSR aerosol retrieval algorithm:current status and presentation of a full-mission AOD dataset

引用

International Journal of Digital Earth 2016年第6期9卷 545-561页

作者： Pekka Kolmonen Larisa Sogacheva Timo H.Virtanen Gerrit de leeuw Markku Kulmala Finnish Meteorological Institute HelsinkiFinland department of Physics University of HelsinkiHelsinkiFinland

An advanced along-track scanning radiometer(AATSR)global multi-year aerosol retrieval algorithm is *** land,the AATSR dual-view(ADV)algorithm utilizes the measured top of the atmosphere(TOA)reflectance in both the nadir and forward views to decouple the contributions of the atmosphere and the surface to retrieve aerosol *** ocean,the AATSR single-view(ASV)algorithm minimizes the discrepancy between the measured and modelled TOA reflectances in one of the views to retrieve the aerosol information using an ocean reflectance *** steps to process global,multiyear aerosol information are *** include cloud screening,the averaging of measured reflectance,and *** of the algorithms are also *** main product of the aerosol retrieval is the aerosol optical depth(AOD)at visible/near-infrared *** retrieved AOD is validated using data from the surface-based AERONET and maritime aerosol network(MAN)sun photometer networks as *** validation shows good agreement with the reference(r=0.85,RMSE=0.09 over land;r=0.83,RMSE=0.09 at coasts and r=0.96,RMSE=0.06 over open ocean).The results of the aerosol retrievals are presented for the full AATSR mission years 2002–2012 with seasonally averaged time series for selected regions.

关键词： Visible/infrared remote sensing earth observation global environmental change atmospheric aerosols

来源：

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

PLATFORM SELECTION FOR COMPLEX SYSTEMS:BUILDING AUTOMATION SYSTEMS

引用

Journal of Systems Science and Systems Engineering 2014年第4期23卷 415-438页

作者： Geerten van de Kaa Henk jan de Vries Jafar Rezaei Faculty of Technology Policyand ManagementDelft University of TechnologyJaffalaan 52628BX DelftThe Netherlands Rotterdam School of Management Erasmus UniversityBurgemeester Oudlaan 503062PARotterdam The Netherlands Faculty of TechnologyPolicyand ManagementDelft University of Technology Jaffalaan 52628BX DelftThe Netherlands Faculty of Technology Policyand ManagementDelft University of Technology Jaffalaan 52628BXDelftThe Netherlands

Automation systems for buildings interconnect components and technologies from the information technology industry and the telecommunications *** these industries,existing platforms and new platforms（that are designed to make building automation systems work） compete for market acceptance and consequently several platform battles among suppliers for building automation networking are being *** is unclear what the outcome of these battles will be and also which factors are important in achieving platform *** the fuzziness of decision makers＇ judgments into account,a fuzzy multi-criteria decision-making methodology called the Fuzzy Analytic Hierarchy Process is applied to investigate the importance of such factors in platform battles for building automation *** present the relative importance of the factors for three types of platforms（subsystem platforms,system platforms,and evolved subsystem platforms）.The results provide a first indication that the set of important factors differs per type of *** example,when focusing on other stakeholders,for subsystem platforms,the previous installed base is of importance;for system platforms,the diversity of the network of stakeholders is essential;and for evolved subsystem platforms,the judiciary is an important factor.

关键词： Building automation system complex system platform Fuzzy Analytic Hierarchy Process(AHP) multi-criteria decision-making(MCDM)

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

20世纪70年代以来松嫩平原乌裕尔河中下游流域的湿地演变

引用

自然资源学报 2006年第6期21卷 949-956,F0003页

作者：黄方张树文 jan de leeuw 张养贞东北师范大学城市与环境科学学院长春130024 中国科学院东北地理与农业生态研究所长春130012 荷兰国际地理信息科学和地球观测学院(ITC)

基于LandsatMSS和TM影像,在GIS技术支持下分析了20世纪70年代中期以来松嫩平原乌裕尔河中下游流域湿地的时空变化。研究表明1976—2000年间研究区湿地变化十分显著,沼泽湿地净减少7.47×104hm2,分别有约5.58×104hm2和3.40×104hm2的沼... 详细信息

基于LandsatMSS和TM影像,在GIS技术支持下分析了20世纪70年代中期以来松嫩平原乌裕尔河中下游流域湿地的时空变化。研究表明1976—2000年间研究区湿地变化十分显著,沼泽湿地净减少7.47×104hm2,分别有约5.58×104hm2和3.40×104hm2的沼泽湿地被开垦为旱地和水田。湿地水资源短缺,约8097.70hm2沼泽变为干草地,1039.58hm2退化成为盐碱地。因洪水淹没,草地沼泽化面积达到2.74×104hm2。耕地总面积净增加12.97×104hm2,8.10×104hm2的旱地转变为水田。草地面积锐减16.93×104hm2,其中44.4%被开发为耕地,约22.3%变为盐碱地,中覆盖度草地退化面积达到2.26×104hm2,但低覆盖度草地退化的速度快。湿地景观斑块数量减少,平均规模缩小,景观更破碎。天然湿地的萎缩和退化与区域气候暖干化趋势和高强度人类活动密切相关。

关键词：湿地景观变化遥感乌裕尔河中下游流域松嫩平原

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

Punctuated ancestral gene gains in streptophyte evolution

引用

Molecular Plant 2022年第5期15卷 799-801页

作者： Iker Irisarri jan de Vries University of Goettingen Institute for Microbiology and GeneticsDepartment of Applied BioinformaticsGoldschmidtstr.137077 GöttingenGermany Campus Institute Data Science(CIDAS) GöttingenGermany University of Goettingen Goettingen Center for Molecular Biosciences(GZMB)Department of Applied BioinformaticsGoldschmidtstr.137077

Understanding the genomic substrate behind evolutionary change is a major endeavor in biology,shedding light on impor-tant aspects of the evolutionary history as well as unraveling the mechanisms of genome *** of the ... 详细信息

关键词： evolution evolution evolutionary

来源：

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

计算机模拟阴离子对碳酸镍结晶过程的影响

引用

无机化学学报 2009年第10期25卷 1823-1828页

作者：刘昉 Nora H. de leeuw 张昭四川大学化学工程学院成都610065 department of Chemistry University College of London London WC1H 0AJ UK

本文采用原子模拟技术,研究了不同溶液中碳酸镍的结晶行为。结果表明,水化作用使碳酸镍晶体更稳定,形貌更规整。杂质阴离子SO42-与碳酸镍晶体表面的作用力较强,但对其形貌影响不大。Cl-对表面的作用力较弱,但使晶体形貌更不规则。在模... 详细信息

本文采用原子模拟技术,研究了不同溶液中碳酸镍的结晶行为。结果表明,水化作用使碳酸镍晶体更稳定,形貌更规整。杂质阴离子SO42-与碳酸镍晶体表面的作用力较强,但对其形貌影响不大。Cl-对表面的作用力较弱,但使晶体形貌更不规则。在模拟的几种情况中,碳酸镍的(104)晶面均是最主要的显露面。模拟结果能与实验现象很好吻合。

关键词：计算机模拟碳酸镍结晶过程阴离子影响

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：