检索结果-南通市图书馆

小学生时代（大嘴英语） 2022年第7期 28-34页

作者： t.G.Lang Huy Voun Lee(图) 不详

to the farm,lefs go,go,go,Summer winds softly *** the pond so blue,blue,blue,Watch the ducks all swim to you.

关键词： winds blue Summer

西藏喜马拉雅地区三叠系-侏罗系界线动物群扩散事件及古环境

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

中国科学（D辑） 2009年第9期39卷 1232-1238页

作者：阴家润 FürsichF.t. 中国地质大学地球科学与资源学院北京100083 Geozentrum Nordbayern Friedrich-Alexander Universitt Erlangen

西藏喜马拉雅格米格地区的三叠系-侏罗系界线地层的菊石类和双壳类曾生活在热带浅海环境.建立在菊石带基础上的高分辨率地层可用于确定一些动物群的发生.双壳类Aguilerella和Ctenostreon展现了泛热带迁移的模式,它们首先出现在喜马拉雅... 详细信息

西藏喜马拉雅格米格地区的三叠系-侏罗系界线地层的菊石类和双壳类曾生活在热带浅海环境.建立在菊石带基础上的高分辨率地层可用于确定一些动物群的发生.双壳类Aguilerella和Ctenostreon展现了泛热带迁移的模式,它们首先出现在喜马拉雅,然后向东迁移到东南太平洋;这一模式同样为菊石类Choristoceras,Discamphiceras,Pleuroacanthites和Psiloceras calliphyllum的地理分布所支持.一些在其他地方晚三叠世业已绝灭的属种,如菊石类有Choristoceras和Eopsiloceras,双壳类有Newaagia,terquemia,Persia,Ryderia guangdongensis和Cultriopsis angusta,在西藏喜马拉雅地区却延续到早侏罗世早期.这一现象表明西藏喜马拉雅地区可能在晚三叠世的生物大绝灭过程中起到了避难所的作用.

关键词：三叠纪末期生物绝灭古生物地理双壳类菊石类

马来西亚沙捞越州石龙门矿带碳酸盐岩交代金矿床、矽卡岩金矿床和侵入岩之间的关系

在线全文

学校读者我要写书评

暂无评论

地质地球化学 1993年第5期21卷 1-9页

作者： t.J.Percival 李松辽宁有色金属勘查大队

在马来西亚沙捞越州石龙门矿带有三种不同的金矿化类型,它们在空间上都与中新世微晶花岗闪长斑岩岩株有关。这些金矿化类型包括:(1)含金钙质矽卡岩;(2)钙质矽卡岩附近和外围的几种矿脉;(3)沉积岩中的碳酸盐岩交代矿体,位于矿脉的边缘,... 详细信息

在马来西亚沙捞越州石龙门矿带有三种不同的金矿化类型,它们在空间上都与中新世微晶花岗闪长斑岩岩株有关。这些金矿化类型包括:(1)含金钙质矽卡岩;(2)钙质矽卡岩附近和外围的几种矿脉;(3)沉积岩中的碳酸盐岩交代矿体,位于矿脉的边缘,一般都远离岩株。迄今为止,石龙门矿带生产的黄金大部分采自碳酸盐岩交代矿床。这些矿床在矿物学和地球化学特征上与美国西部的卡林型金矿床非常相似。这些矿床在主要的矿物学和地球化学特征上具有相似性的事实说明,所有这三种矿化类型不仅在空间上,而且在成因上都与微晶花岗闪长斑岩岩株有关。对这三种金矿化类型的石英中的流体包裹体的初步测试结果表明,随着与岩株距离的增大,地温梯度和盐度梯度也随之降低。

关键词：金矿床矽卡岩侵入岩碳酸盐岩

Identification of sequence-specific interactions of the CD44-intracellular domain with RUNX2 in the transcription of matrix metalloprotease-9 in human prostate cancer cells

在线全文

学校读者我要写书评

暂无评论

Cancer Drug Resistance 2020年第3期3卷 586-602页

作者： Linda t.Senbanjo Hanan AlJohani Mohammed AlQranei Sunipa Majumdar tao Ma Meenakshi A.Chellaiah Department of Oncology and Diagnostic Sciences University of Maryland School of DentistryBaltimoreMD 21201USA.

Aim:the Cluster of differentiation 44(CD44)transmembrane protein is cleaved byγ-secretase,the inhibition of which blocks CD44 *** study aimed to determine the biological consequence of CD44 cleavage and its potential interaction with Runt-related transcription factor(RUNX2)in a sequence-specific manner in PC3 prostate cancer ***:Using full-length and C-terminal deletion constructs of CD44-ICD(D1-D5)expressed as stable green fluorescent protein-fusion proteins in PC3 cells,we located possible RUNX2-binding ***:Chromatin immunoprecipitation assays demonstrated that the C-terminal amino acid residues between amino acids 671 and 706 in D1 to D3 constructs were indispensable for sequence-specific binding of *** binding was minimal for sequences in the D4 and D5 ***,an increase in matrix metalloprotease-9(MMP-9)expression was observed at the mRNA and protein levels in PC3 cells stably expressing D1–D3 ***:these results provide biochemical evidence for the possible sequence-specific CD44-ICD/RUNX2 interaction and its functional relationship to MMP-9 transcription in the promoter region.

关键词： Prostate cancer metastasis CD44 RUNX2 CD44-ICD MMP-9 tumorigenesis

基于FLUX 2D的大型同步发电机在额定运行下定子绕组匝间短路故障特性研究

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

中国电机工程学报 2013年第3期33卷 125-132,7页

作者：叶志军游佰强 J.Rosendahl S.t.Kulig 多特蒙德工业大学电机拖动与机电一体化研究所厦门大学信息科学与技术学院福建省厦门市361005

该文采用单一绕组分析和有限元分析相结合的方法,研究大型同步发电机在额定运行方式下定子绕组匝间短路故障特性。该方法同样适用于确定故障条件下的电流和转矩。对于内部故障情况的电磁瞬态仿真必须考虑到一些特殊措施,如单一绕组和电... 详细信息

该文采用单一绕组分析和有限元分析相结合的方法,研究大型同步发电机在额定运行方式下定子绕组匝间短路故障特性。该方法同样适用于确定故障条件下的电流和转矩。对于内部故障情况的电磁瞬态仿真必须考虑到一些特殊措施,如单一绕组和电网之间正确的连接对于模拟内部故障是相当关键的。以往的结果表明,在内部磁场非对称的情况下,基于等效电路的经典算法是不适用的。该文通过对汽轮发电机匝间短路故障进行系统的研究,表明:其短路电流、相电流、转矩和径向力与短路的位置及匝数紧密相关。在一些短路情况下,发电机将产生很大的局部电流,该局部电流对同步发电机的影响甚至超过外部故障。此外,很大的径向力作用在转子上可能对整个转轴产生极大的危害。

关键词：同步发电机定子绕组有限元法匝间短路

traumatic brain injury and sight loss in military and veteran populations–a review

在线全文

学校读者我要写书评

暂无评论

Military Medical Research 2022年第1期9卷 71-85页

作者： Syeda F.Hussain Zara Raza Andrew t.G.Cash thomas Zampieri Robert A.Mazzoli Randy H.Kardon Renata S.M.Gomes Research&Innovation Blind Veterans UK12-14 Harcourt StreetLondon W1H 4HDUK. Bravo Victor Research12-14 Harcourt StreetLondon W1H 4HDUK Blinded Veterans Association 1101 King StreetSuite 300AlexandriaVirginia 22314USA Department of Ophthalmology Madigan Army Medical Center9040 Jackson AvenueTacomaWashington 98431USA lowa City VA Health Care System and Iowa City VA Center for the Prevention and treatment of Visual Loss Iowa CityIowa 52246USA department of Ophthalmology and Visual Sciences The University of IowaIowa CityIowa 52242USA Northern Hub for Veterans and Military Families Research Department of NursingMidwifery and HealthFaculty of Health and Life SciencesNorthumbria UniversityNewcastle NE77XAUK.

War and combat exposure pose great risks to the vision *** recently,vision related deficiencies and impairments have become common with the increased use of powerful explosive devices and the subsequent rise in incidence of traumatic brain injury(tBI).Studies have looked at the effects of injury severity,aetiology of injury and the stage at which visual problems become *** was little discrepancy found between the frequencies or types of visual dysfunctions across blast and non-blast related groups,however complete sight loss appeared to occur only in those who had a blast-related ***,the more severe the injury,the greater the likelihood of specific visual disturbances occurring,and a study found total sight loss to only occur in cases with greater *** of mild tBI(mtBI)is *** able to identify a potential tBI via visual symptoms may offer a new avenue for diagnosis.

关键词： traumatic brain injury Visual impairment Military Veteran

在线全文

学校读者我要写书评

暂无评论

对研究与开发工作（R＆D）输入的情报

国外情报科学 1991年第1期9卷 22-32页

作者： White.,t 何蕾放

本文研究了R&D系统对情报的利用.经与42名从事研究与开发工作人员的蔓谈表明.这些人都参与了5种研究活动形式中的一种;如搜集事实或意见,提出假说.提出解决问蘧的方案.进行可行硅研究或产品开发.根据对这些人员社研活动的分析,可以把他... 详细信息

本文研究了R&D系统对情报的利用.经与42名从事研究与开发工作人员的蔓谈表明.这些人都参与了5种研究活动形式中的一种;如搜集事实或意见,提出假说.提出解决问蘧的方案.进行可行硅研究或产品开发.根据对这些人员社研活动的分析,可以把他们的活动区分为不同阶段.他们对情报的利用是一项至关重要的研究,它揭示了竞成各项研究工作所需要情报的种类.本文列举了不同类别R&D的活动,分析了它们各自任务及所需输入的情报.在这一面研究中,揭示了内部情报.外部掎报.非正式渠道情报与正式渠道情报的相对氲要性.情报利用贯穿于整个科研活动中,而不仅仅在科研活的开始牺结尾,大置的情报根本不是来自外部情报谭和正式情报源.

关键词：情报利用情报用户情报需求

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

成像板对X射线的能量响应

原子能科学技术 2009年第7期43卷 644-647页

作者：骆志平 C. Suzuki t. Kosako 马吉增中国原子能科学研究院辐射安全研究部北京102413 中国辐射防护研究院山西太原030006 清华大学工程物理系北京100084 东京大学日本东京1130032

作为X射线探测器,成像板的光激发光子信号对X射线的能量响应是非常重要的数据。利用同步辐射光源的单能X射线照射成像板,得到成像板对低能光子的能量响应曲线,并与MCNP程序计算结果进行对比分析,得到成像板响应函数的衰减模型。计算结... 详细信息

作为X射线探测器,成像板的光激发光子信号对X射线的能量响应是非常重要的数据。利用同步辐射光源的单能X射线照射成像板,得到成像板对低能光子的能量响应曲线,并与MCNP程序计算结果进行对比分析,得到成像板响应函数的衰减模型。计算结果与实验结果一致,为进一步开展成像板在辐射测量领域的研究工作提供了参考。

关键词：成像板能量响应 X射线衰减模型

Late Quaternary palaeoenvironmental changes documented by microfaunas and shell stable isotopes in the southern Pearl River Delta plain,South China

在线全文

学校读者我要写书评

暂无评论

Journal of Palaeogeography 2013年第4期2卷 344-361页

作者： Liu Chunlian Franz t. Fürsich Wu Jie Dong Yixin Yang tingting Yin Jian Department of Earth Sciences Sun Yat-Sen University Geozentrum Nordbayern FG Pal oumwelt der Friedrich-Alexander-Universitt Erlangen Guangdong Provincial Key Laboratory of Mineral Resources and Geological Processes

Ahigh resolution study of sediments,microfaunas(ostracods and foraminifers),and stable isotopes of ostracod shells from core PRD05,sampled from the Da’ao plain of the Pearl River Delta,provides new data about palaeoenvironmental changes during the Late *** basal fluvial gravelly sediments of the core,representing the lowest deposits of the Quaternary at the core site,were possibly formed prior to the transgression associated with the last interglacial *** fluvial setting changed into a marginal marine setting during the last interglacial stage,any record of calcareous fossils were destroyed by subsequent dissolution during the last glacial phase,when the upper part of the deltaic sediments experienced subaerial oxidation,indicated by a mottled clay layer in the *** postglacial sealevel rise in the South China Sea began at16,700 cal yr *** the first phase of sea-level rise(from ~16,700 to 10,100 cal yr B.P.),a swamp environment developed at the core *** ~10,100 cal yr B.P.,marine waters intruded onto the Da’ao plain and reached the core site through the Modaomen *** timing was earlier than in other parts of the Pearl River *** then,a semi-enclosed estuarine environment developed and was maintained until ~5560 cal yr *** this transgressive interval,short-term environmental fluctuations can be recognized based on microfauna and shell geochemical *** ~10,100 to 8630 cal yr B.P.,the sea-level rose,which was followed by a fall from ~8630 to 8520 cal yr *** expanded transgression occurred between ~8520 and 7900 cal yr *** time intervals from ~8520 to 8200 cal yr *** from ~8080 to 7900 cal yr *** marked by peak *** ~7900 to 5560 cal yr B.P.,the core site generally showed a reduced marine influence and enhanced freshwater input.A fluvial environment developed from ~5560 to 3100 cal yr B.P.,and was succeeded by an alluvial plain setting.

关键词： Late Quaternary microfauna shell stable isotopes palaeoenvironment Pearl River Delta

Optimization of a High Speed Spinning Disk Spindle System for Minimum RRO,NRRO,and Lightweight by Using G.A.

在线全文

学校读者我要写书评

暂无评论

厦门大学学报(自然科学版) 2002年第S1期41卷 89-90页

作者： Y H Choi S t Kim K C Yoon J M Kim Y J Kang Dept.of Mechanical Design and Manufacturing Changwon National UniversityKyungnam 641-773Korea Dept.of Mechanical Engineering Changwon National UniversityKyungnam 641-773Korea Senoir Research Engineer R&D Cente FAGHANWHA Bearing Corp.Kyungnam 641-020Korea Graduate Student Dept.of Mechanical Design and ManufacturingChangwon National UniversityKyungnam 6412773Korea

Law level of RRO(Repeatable Run Out),NRRO(Non Repe at able Run Out),and lightweight construction are a major trend in the high-speed HDD(Hard Disk Drive)sytem to reduce track misregestration and to achieve high track density,which lead to succeed in the ***,it is not easy to r educe RRO,NRRO,and the weight of the spinning disk spindle system efficiently because lightweight construction and or bearing stiffness changes often yields a decrease in the static and dynamic stiffness of the system,and consequently hi gh vibrations may be generated as a ***,it is of importance to e valuate in advance the accurate dynamic behavior of the high speed spinning disk spindle system of a HDD *** study introduces an optimum design of the high speed spinning disk spindle system of a HDD for minimum RRO,NRRO,and lightweight construction using a gene tic *** spinning disk,hub,and bearing components of a HDD system ar e modelled as appropriate finite elements respectively and their equations of mo tion are derived to construct the system equations of the whole spinning disk sp indle system of the HDD *** RRO and NRRO responses of the spinning disk,due to exciting forces arised from ball bearing faults and rotating unbalance,are *** the design optimation,the hub thickness,the disk thickness,bearing positio ns(or bearing span)and bearing stiffness were set as design *** uni que objective function is obtained by multiplying an appropriate weighting facto r by multi-objective functions,such as RRO,NRRO,and the total weight of HDD the *** constraints are maximum RRO limit,maximum weight linit,and the critical speed limit of the HDD spindle *** show that the RRO,NRRO,and weight are reduced by 6%,66.7%and 28%r espectively compared with the initial design of the HDD ***,thi s present study can be used for an optimum design of the spinning disk spindle s ystem of a HDD for lightweight construction

关键词： design optimization genetic algorithm multiobjective optimization repeatable run out non repeatable run out