检索结果-南通市图书馆

SUBSTRATE EFFECT ON h.d.OGENATEd MICROCRYSTALLINE SILICON FILMS dEPOSITEd WITh VhF-PECVd TEChNIQUE

Acta Metallurgica Sinica(English Letters) 2006年第4期19卷 295-300页

作者： h.d. Yang department of Electronic Engineering Jinan University Guangzhou 510632 China

Raman spectra and scanning electron microscope （SEM） techniques were used to determine the structural properties of microcrb＇stalline silicon （μc-Si：h） films deposited on different substrates with the very high frequency plasma-enhanced chemical vapor deposition （VhF-PECVd） technique. Using the Raman spectra, the values of crystalline volume fraction Xc and average grain size d are 86%, 12.3nm; 65%, 5.45nm; and 38%, 4.05nm, for single crystalline silicon wafer, coming 7059 glass, and general optical glass substrates, respectively. The SEM images further demonstrate the substrate effect on the film surface roughness. For the single crystalline silicon wafer and Coming 7059 glass, the surfaces of the μc-Si：h films are fairly smooth because of the homogenous growth or h＇ttle lattice mismatch. But for general optical glass, the surface of the μ-Si： h film is very rough, thus the growing surface roughness affects the crystallization process and determines the average grain size of the deposited material. Moreover, with the measurements of thickness, photo and dark conductivity, photosensitivity and activation energy, the substrate effect on the deposition rate, optical and electrical properties of the μc-Si：h thin films have also been investigated. On the basis of the above results, it can be concluded that the substrates affect the initial growing layers acting as a seed for the formation of a crystalline-like material and then the deposition rates, optical and electrical properties are also strongly influenced, hence, deposition parameter optimization is the key meth.d.that can be used to obtain a good initial growing layer, to realize the deposition of μc-Si：h films with.d.vice-grade quality on cheap substrates such as general glass.

关键词： h.d.ogenated microcrystalline silicon film VhF-PECVd (very high frequency plasma-enhanced chemical vapor deposition) substrate effect

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

Computational Analysis of a Variable Ejector Flow

引用

Journal of Thermal Science 2006年第2期15卷 140-144页

作者： h.d. KIM J.h. LEE T. SETOGUChI S.MATSUO School of Mechanical Engineering Andong National University 388 Songchun-dong Andong 760-749 Korea department of Mechanical Engineering Saga University 1 Honjo Saga 840-8502 Japan

The present study addresses a variable ejector which can improve the ejector efficiency and control the re-circulation ratio under a fixed operating pressure ratio. The variable ejector is a facility to obtain specific recirculation ratio under a given operating pressure ratio by varying the ejector throat area ratio. The numerical simulations are carried out to provide an understanding of the flow characteristics inside the variable ejector. The sonic and supersonic nozzles are adopted as primary driving nozzles in the ejector system, and a movable cone cylinder, inserted into a conventional ejector-diffuser system, is used to change the ejector throat area ratio. The numerical simulations are based on a fully implicit finite volume scheme of the compressible, Reynolds-Averaged Navier-Stokes equations. The results show that the variable ejector can control the recirculation ratio at a fixed operating pressure ratio.

关键词： variable ejector ejector throat area ratio re-circulation ratio

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

第五届不列颠杀虫剂杀菌剂会议录(1969) 用苏云金杆菌防除害虫

引用

山东农业科学 1974年第1期 44-51页

作者： h.d.布尔基斯巴京汉郡斯劳害虫研究实验室山东农科院情报资料组

苏云金杆菌(Bacillus thuringiensis)的孢子和伴孢晶体所形成的微生物杀虫剂是十分安全、容易生产、而且是性能稳定的。这种杀虫剂对于植物没有害处,实际上是专门对付鳞翅目幼虫的。它与一切生物防除方法和化学杀虫剂都可以同时并用。... 详细信息

苏云金杆菌(Bacillus thuringiensis)的孢子和伴孢晶体所形成的微生物杀虫剂是十分安全、容易生产、而且是性能稳定的。这种杀虫剂对于植物没有害处,实际上是专门对付鳞翅目幼虫的。它与一切生物防除方法和化学杀虫剂都可以同时并用。它是经过害虫的肠腔起作用的。害虫摄入苏云金杆菌后,在几小时内就停止进食。显而易见,害虫的中肠酶类促使从伴孢晶体中把肠麻痹和破坏性有效毒素释放出来。这种毒素只对植株地上部表面就食的幼虫起作用。使用这种细菌制剂时,喷布均匀是重要的。在美国苏云金杆菌对四种害虫的防除费用与化学杀虫剂略等,对23个种的防除效果较好,这种微生物杀虫剂的使用,尤其在烟草和甘兰上面比较可观,且在扩大。最近对树篱的苹巢蛾 (Yponomeuta malinella)才开始推荐试用。在联合王国有人就苏云金杆菌在防除害虫方面的可能发展前途作过评论。这方面的研究工作正在积极进行,希望在害虫防除的途径方面开辟新的前景。

关键词：苏云金杆菌苏云金芽孢杆菌嗜虫细菌害虫

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

A Review of Botulism in China

引用

Biomedical and Environmental Sciences 1990年第3期3卷 326-336页

作者： GAO Q.Y. hUANG Y.F. WU J.G. LIU h.d. XIA h.Q Institute of Food Safety Control and Inspection Ministry of Public Health 29 Nan Wei Road Beijing 100050 Sanitary and Antiepidemic Station of Urumqi City Urumqi Xinjiang Autonomous Region Sanitary and Antiepidemic Station of Tachen district Tachen Xinjiang Autonomous Region Pipeline Bureau hospital Ministry of Petroleum Langfang HebeiPeople's Republic of China

The epidemiological characteristics and etiology of botulisin in China, as well as the distribution of different types of Clustridium bolulinum in China; are *** 1989, 15 provinces and autonomous regions reported the occurrence of *** were 2861 cases involved in 745 *** the cases 421 died, with a case fatality of 14.7%.The main epidemiological characteristics of botulism in China are: (i) the major foods causing botulism are homemade fermented bean products which accounted for 62.6% of the cases; (ii) the incubation period is longer (3 h-54 days) than that described in the western literature (mostly 2-7 days); (iii) the peak occurrence is from February to May; (iv) the progression of symptoms and signs is slower than that of western *** types of *** the exception of type G, have been found in *** distribution of various types of *** is significantly different between southern and northern China; this is related to the latitude and is correlated with the prevalence of this *** of the botulism outbreaks occurred above 30° north latitude in northern China and outbreaks rarely occurred below 30° north *** surveys showed that the average detection rate of C bolulinum spores in soil and foods in the northern parts of China was 14.8%.while it was only 2.5% in the *** types A, B, *** F, which are involved in human botulism, were frequently found in the North, while types C and d, which are involved only in animal intoxication, were found more frequently in the south. 1990 Academic ***.

关键词： In A Review of Botulism in China

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

Effects of temperature and thermally-induced microstructure change on h.d.aulic conductivity of Boom Clay

引用

Journal of Rock Mechanics and Geotechnical Engineering 2017年第3期9卷 1-13页

作者： W.Z. Chen Y.S. Ma h.d. Yu F.F. Li X.L. Li X. Sillen Research Centre of Geotechnical and Structural Engineering Shandong University Jinan Shandong 250061 China State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil Mechanics Chinese Academy of Sciences Wuhan 430071 China University of Chinese Academy of Sciences Beijing 100049 China European Underground Research Infrastructure for disposal of Nuclear Waste in Clay Environment EIG Euridice Mol 2400 Belgium ONdRAF/NIRAS Brussel 1210 Belgium

Boom Clay is one of the potential host rocks for deep geological disposal of high-level radioactive nuclear waste in Belgium. In order to investigate the mechanism of h.d.aulic conductivity variation under complex thermo-mechanical coupling conditions and to better understand the thermo-h.d.omechanical(ThM) coupling behaviour of Boom Clay, a series of permeability tests using temperaturecontrolled triaxial cell has been carried out on the Boom Clay samples taken from Belgian underground research laboratory(URL) h.d.S. due to its sedimentary nature, Boom Clay presents acrossanisotropy with respect to its sub-horizontal bedding plane. direct measurements of the vertical(Kv)and horizontal(Kh)h.d.aulic conductivities show that the h.d.aulic conductivity at 80℃ is about 2.4 times larger than that at room temperature(23℃), and the h.d.aulic conductivity variation with temperature is basically reversible during heatingecooling cycle. The anisotropic property of Boom Clay is studied by scanning electron microscope(SEM) tests, which highlight the transversely isotropic characteristics of intact Boom Clay. It is shown that the sub-horizontal bedding feature accounts for the horizontal permeability higher than the vertical one. The measured increment in h.d.aulic conductivity with temperature is lower than the calculated one when merely considering the changes in water kinematic viscosity and density with temperature. The nuclear magnetic resonance(NMR) tests have also been carried out to investigate the impact of microstructure variation on the ThM properties of clay. The results show that heating under unconstrained boundary condition will produce larger size of pores and weaken the microstructure. The discrepancy between the h.d.aulic conductivity experimentally measured and predicted(considering water viscosity and density changes with temperature) can be attributed to the microstructural weakening effect on the thermal volume change behaviour of Boom Clay. Based on the ex

关键词： Boom Clay Permeability Thermal effect Anisotropy Microstructure

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

dielectric and insulating properties of SrTiO_3/Si heterostructure controlled by cation concentration

引用

Science China(Physics,Mechanics & Astronomy) 2013年第12期56卷 2404-2409页

作者： YANG Fang YANG ZhenZhong LI WenTao LI FengMiao ZhU XueTao GU Lin LEE h.d. ShUBEITA S. XU C. GUSTAFSSON T. GUO Jiandong Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of Sciences department of Physics and Astronomy Rutgersthe State University of New Jersey

SrTiO3 films with.d.fferent cation concentration were deposited on Si（001） substrates by oxide molecular beam epitaxy. An amorphous layer was observed at the interface whose thickness depends on the oxygen pressure and the substrate temperature during growth. Although lowering the oxygen vacancy concentration in SrTiO3 led to better insulating performance as indi- cated by the lowered leakage current density of the heterostructure, the dielectric performance was deteriorated because of the thickened interracial layer that dominated the capacitance of SrTiO3/Si heterostructure. Instead of adjusting the oxygen vacan- cy concentration, we propose that controlling the film cation concentration is an effective way to tune the dielectric and insu- lating properties of SrTiO3/Si at the same time.

关键词： oxide heterostructure oxide films film stoichiometry cation concentration interfaciai layer

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

Application of grouped detrital zircon analyses to determine provenance and closely approximate true depositional age:Early Cretaceous McMurray-Clearwater succession,Canada

引用

Geoscience Frontiers 2021年第2期12卷 877-892页

作者： L.Rinke-hardekopf S.E.dashtgard C.huang h.d.Gibson Applied Research in Ichnology and Sedimentology(ARISE)Group Dept.of Earth SciencesSimon Fraser University8888 University DriveBurnabyBC V5A 1S6Canada

In the Lower CretaceousMcMurray-Clearwater succession of the intracontinental Alberta Foreland Basin,Canada,detrital zircon U-Pb geochronology samples(referred to herein as dZ samples)have been used to interpret the strata as representing a paleo-continental-scale drainage ***,the majority of dZ samples are relatively small(n≈90–100),and syndepositional dZ(i.e.,crystallization ageder than depositional age)are *** has forced a reliance on dinocysts with long stratigraphic ranges to chronostratigraphically subdivide the McMurray-Clearwater succession rather than employing maximum depositional ages(MdAs)derived from dZ ***,43 dZ samples(taken from20 subsurface cores)are assigned to 1 of 5 stratigraphic intervals,and in each stratigraphic interval all associated dZ samples are combined to produce a grouped dZ *** and comparison of individual and grouped dZ samples are used to(1)assess variability in provenance through time and space,and(2)assess the accuracy of chronostratigraphically subdividing the succession using *** the main paleo-drainage axis,a comparison of dissimilarity between dZ samples from the same stratigraphic interval,as well as between stratigraphic intervals,reveals increasing average dissimilarity between individual dZ samples and their respective grouped dZ samplewith increasing spatial separation of *** data indicate that in the McMurray depocenter some sediment is sourced from local tributaries,leading to geographical provenance *** for all 43 dZ samples and groupedMdAs(gMdAs)for the 5 grouped dZ samples are compared to an ash.d.rived absolute age and existing *** theMcMurray Formation,comparison of MdAs to gMdAs shows that in basins with rare syndepositional dZ,the gMdA meth.d.improved depositional age estimates by transforming low-confidence MdAs(e.g.,youngest single grains)into high-confidence(multi-grain)*** the Clearwater Formationwhere

关键词： detrital zircon Maximum depositional age Provenance variability Intracontinental foreland basin McMurray-Clearwater succession

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

中国中产阶级文化认同的培育

引用

湘潭大学学报（哲学社会科学版） 2012年第1期36卷 81-86页

作者： h.d.斯蒂芬尼郑怡罗如春澳大利亚悉尼科技大学国际研究学院澳大利亚悉尼科技大学湘潭大学文学与新闻学院中国社会科学院文学所

金元浦认为文化的历史流传物作为集体文化记忆,是作为当时文化事件的延伸活动被记录的,是由诸多个体记忆碰撞、对话、沟通、交流而形成集体记忆的。集体前理解正是通过不断生成的第三生成物调整、修正、转换,生成新的文化集体记忆和文... 详细信息

金元浦认为文化的历史流传物作为集体文化记忆,是作为当时文化事件的延伸活动被记录的,是由诸多个体记忆碰撞、对话、沟通、交流而形成集体记忆的。集体前理解正是通过不断生成的第三生成物调整、修正、转换,生成新的文化集体记忆和文化集体无意识,改变传统文化意识的既成结构,形成新的集群/民族文化心理共同体。史蝶飞等认为当代中国的新兴中产阶级通过都市化的报刊阅读、旅游文化和教育选择确立起了自己独特的品位结构与身份认同。中国中产阶级的崛起不能简单地根据收入和社会行为进行界划,也不能仅仅按照西方通行的理论看待这一现象,它受到了中国特色的政治、经济、社会和文化等语境的多维而复杂的影响。罗如春提出赛义德是后殖民知识分子中惟一一位系统探讨知识分子角色身份的思想家。赛义德心目中的理想知识分子的形象就是:以流亡者、边缘人身份,打破专业藩篱,秉持业余态度,坚持社会批判,面对权势说真话,成为普适价值的捍卫者。赛义德本人就是这样的知识分子的典型代表,他也表征了后殖民知识分子带有普遍性的角色身份及其认同期许。

关键词：中产阶级文化认同中国培育英语世界政治制度权威主义现代性

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

湖滨散记

湖滨散记

引用

1978年

作者： h.d.梭罗吴明实译

来源：汇雅图书（南通市图书馆... 评论

在线全文

汇雅图书（南通市图书馆）

学校读者我要写书评

暂无评论

国际数学竞赛题解

国际数学竞赛题解

引用

1981年

作者：（德）h.d.霍恩舒赫编潘振亚等译

来源：汇雅图书（南通市图书馆... 评论

在线全文

汇雅图书（南通市图书馆）

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：