检索结果-南通市图书馆

Scientia Sinica 1964年第1期 149-158页

作者：蒋震东 Institut fr Elektrotechnik Akademie der Wissenschaften

EINlEITUNG Die mathematische losung des Warme-Einschwingvorgangs einer elektrischen chine wurde meistens unter tatsachlichan Warmeprozesse

关键词： der SUNG DER W RPERSYSTEMS DIE ANAlYTISCHE l RME-EINSCHWINGVORGANGS EINES GESCHlOSSENEN INDUKTIONSMOTORS MIT HIlfE EINES ZWEIK

Secretory Structures in <i>flourensia campestris</i>and <i>f. oolepis</i>: Ultrastructure, Distribution, and (-)-Hamanasic Acid A Secretion

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

American Journal of Plant Sciences 2015年第7期6卷 925-942页

作者： Mariana P. Silva Graciela M. Tourn Daniela lópez Beatriz G. Galati leonardo A. Piazza Gabriela Zarlavsky Juan J. Cantero Ana l. Scopel Estación de Biología Sierras Facultad de Agronomía-Sede Punilla Universidad de Buenos Aires Casilda S/N Huerta Grande Córdoba Argentina Instituto de Investigaciones en Biociencias Agrícolas y Ambientales (INBA) Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) Buenos Aires Argentina Cátedra de Botánica Agrícola Facultad de Agronomía Universidad de Buenos Aires Buenos Aires Argentina Departamento de Biología Agrícola Facultad de Agronomía y Veterinaria Universidad de Río Cuarto Río Cuarto Córdoba Argentina Instituto Multidisciplinario de Biología Vegetal (CONICET-UNC) Córdoba Argentina

In this work, the localization, density, morphology and ultrastructure of secretory structures in aerial organs of flourensia campestris (fC) and f. oolepis (fO) (Asteraceae) by means of a combination of light, fluorescence, transmission (TEM) and scanning electron microscopy (SEM) were examined. The possible role of secretory structures in the production and secretion of the phytotoxic sesquiterpene (-)-hamanasic acid A ((-)HAA) in both species was also assessed. Capitate glandular trichomes were found in all reproductive organs of fC and fO, and were being reported for the first time. These glandular trichomes, typically associated to edges and veins, were of the same type as those already described for vegetative organs, and were abundant in involucral bracts and corolla of tubulose and ligulate flowers. Their density in reproductive organs of both species was similar (ca. 30/mm2) and lower than that found in leaves (ca. 100/mm2) and stems (ca. 160/mm2 in fC, and up to 650/mm2 in fO). Glandular trichomes in vegetative organs followed a species-specific pattern of distribution. TEM and SEM observations suggest that each species differs in the way in which secretory materials are released to the outside: through cracks or pores in fC, or through a loose cuticle in fO. Similar inspections of the secretory ducts revealed lipophilic vacuoles localized in subepithelial and epithelial cells, in which secretions accumulated before being transferred to the duct. The presence of wall ingrowths in subepithelial cells suggests that granulocrine secretion operates in these species. Secretory ducts varied in density and diameter among the organs in both species, with the combination being maximal in woody stems. (-)HAA was only detected in surface secreted resins of both species, and its concentration (2D-TlC, GC-fID) was intimately associated with the distribution and density of glandular trichomes in each organ (capitula, leaves, and stems with primary or secondary growth).

关键词： flourensia campestris flourensia oolepis Glandular Trichomes Secretory Ducts Reproductive Organs Ultrastructure (-)-Hamanasic Acid A Resins

PlASTIC DEfORMATION AND DISlOCATION STRUCTURE IN γ'-PHASE Of A DIRECTIONAllY SOlIDIfIED Ni-BASE SUPERAllOY

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

Acta Metallurgica Sinica(English letters) 1990年第2期3卷 79-88页

作者： WEN Mao lIN Dongliang T.l.lin Shanghai Jiaotong University,Shanghai,China lIN Dongliang Professor,Shanghai Jiaotong University,Shanghai 200030,China

The dislocation structure of directionally solidified(DS)Rene 80 superalloy during tensile and creep deformation has been studied by *** tensile deformation,γ'shearing occurs by slip of APB-coupled(1/2)dislocation pairs on{111}planes at temperatures below 760℃.and by slip of SISf-seperated(1/3)superpartials which have dissociated on {111}planes into a(1/2)screw superpartial and a(1/6)edge superpartial with an APB in between at temperatures equal to or above 760℃.In creep deformation,γ'shearing occurs again by slip of SISf-seperated(1/3)superpartials which have not dissociated on{111}planes and by diffusive slip of APB-coupled(1/2) dislocation pairs at 760℃,618 ***,no γ'shearing occurs at 980℃,190 *** secondary creep at 760℃,618 MPa or at 980℃,190 MPa,2-dimensional net- works have formed at γ/γ'interfaces,and the strain is mainly the result of diffusion control- led climb of dislocation networks at γ/γ'*** dependence of secondary creep rate ε upon size a and volume fraction v_■ of cubic γ' has been found to be ■∝α/v_f^(2/3).

关键词： directional solidification alloy DS Rene'80 plastic deformation γ'phase

在线全文

学校读者我要写书评

暂无评论

香港地区晚更新世的构造活动性

华南地震 2013年第2期33卷 1-13页

作者：丁原章邓丽君王俊晖广东省地震局广东广州510070 中国地震局地震监测与减灾技术重点实验室广东广州510070 广东省地震预警与重大工程安全诊断重点实验室(筹) 广东广州5100702 香港特别行政区政府土木工程拓展署土力工程处

河沥背西北走向的断层最近期的构造活动发生于晚更新世时期,至全新世已经完全停止。晚更新世后期香港地区(如河沥背、黄竹洋、南山和贝澳)滑坡、泥石流和巨型滚石等重力地质事件频繁发生,而且还有原地重复的情况。按照地面地质破坏现象... 详细信息

河沥背西北走向的断层最近期的构造活动发生于晚更新世时期,至全新世已经完全停止。晚更新世后期香港地区(如河沥背、黄竹洋、南山和贝澳)滑坡、泥石流和巨型滚石等重力地质事件频繁发生,而且还有原地重复的情况。按照地面地质破坏现象的分布范围、规模和数量等指针综合分析,在晚更新世后期香港地区可能曾经遭受过强烈地震的袭击,其烈度估计可达IX-X度,而且在数万年之内曾经多次发生。1万年以来,构造运动减弱,地震活动降低,地面运动的最大强度相应减小。

关键词：活动断层滑坡晚更新世的构造活动性地震烈度

Nanostructured 3-D Collagen/Nanotube Biocomposites for future Bone Regeneration Scaffolds

在线全文

学校读者我要写书评

暂无评论

Nano Research 2009年第6期2卷 462-473页

作者： Edelma E.da Silva Heloisa H.M.Della Colleta Andre S.ferlauto Roberto l.Moreira Rodrigo R.Resende Sergio Oliveira Gregory T.Kitten Rodrigo G.lacerda luiz O.ladeira Universidade federal de Minas Gerais Departamento de FísicaLaboratório de NanomateriaisAv.Antônio Carlos662730123-970Belo HorizonteMGBrazil Universidade federal de Minas Gerais Departamento de MorfologiaAv.Antônio Carlos662730123-970Belo HorizonteMGBrazil

The fi eld of bionanotechnology has been rapidly growing during the last few years and we can now envision a controllable integration between biological and artificial matter,where new biomimetic structures with a wide range of chemical and physical properties will promote the development of a novel generation of medical *** this work we describe a collagen/carbon nanotube composite which has the potential to be used as a scaffold for tissue *** this biocomposite incorporates the advantageous properties of both collagen and carbon nanotubes,it has most of the characteristics that an ideal biomaterial requires in order to be used as an osteoinductive *** biocomposite is bioresorbable and biodegradable and has the desired mechanical rigidity while maintaining a three-dimensional(3-D)nanostructured *** stability and swelling were achieved under fluid environments by varying the amount of carbon nanotubes(CNTs)incorporated into the *** variations can dictate the degree of interaction between fibroblastic cells and the ***-of-concept was shown by performing an in vitro induced mineralization of hydroxylapatite crystals under physiological ***,the ability to attach biofunctional groups to the CNT walls can open a new road for tissue regeneration since the combination of CNTs with specific growth factors or cellular ligands can create an environment capable of signaling and infl uencing specifi c cell *** observations suggest that collagen/carbon nanotube biocomposites will have important uses in a wide range of biotechnological areas.

关键词： Biomaterials carbon nanotubes collagen tissue engineering biocompatibility

Theoretical study of defect impact on two-dimensional MoS

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

Journal of Semiconductors 2015年第12期 22-27页

作者： Anna V.Krivosheeva Victor l.Shaposhnikov Victor E.Borisenko Jean-louis lazzari Chow Waileong Julia Gusakova Beng Kang Tay Belarusian State University of Informatics and Radioelectronics CNRS Aix-Marseille Université NOVITAS Nanoelectronics Centre of Excellence School of Electrical and Electronic Engineering Nanyang Technological University CINTRA CNRS NTUTHALES Nanyang Technological University

Our theoretical findings demonstrate for the first time a possibility of band-gap engineering of monolayer MoS;crystals by oxygen and the presence of vacancies. Oxygen atoms are revealed to substitute sulfur ones, forming stable MoS;O;ternary compounds, or adsorb on top of the sulfur atoms. The substituting oxygen provides a decrease of the band gap from 1.86 to 1.64 eV and transforms the material from a direct-gap to an indirect-gap semiconductor. The surface adsorbed oxygen atoms decrease the band gap up to 0.98 eV depending on their location tending to the metallic character of the electron energy bands at a high concentration of the adsorbed atoms. Oxygen plasma processing is proposed as an effective technology for such band-gap modifications.

关键词： two-dimensional crystal molybdenum disulfide band gap vacancy oxygen

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

法国立体定向脑电图指南

癫痫杂志 2018年第4期4卷 354-361页

作者： Isnard J Taussig D Bartolomei f Bourdillon P Catenoix H Chassoux f Chipaux M Clémenceau S Colnat-Coulbois S Denuelle M Derrey S Devaux B Dorfmüller G Gilard V Guenot M Job-Chapron AS landréE lebas A Maillard l McGonigal A Minotti l Montavont A Navarro V Nica A Reyns N Scholly J Sol JC Szurhaj W Trebuchon A Tyvaert l Valenti-Hirsch MP Valton l Vignal JP Sauleau P 龙绮婷张翠荣尚力张玮刘兴洲

立体定向脑电图(SEEG)在上世纪60年代诞生于法国,由***和***共同发明。SEEG为一种介入方法,可用于耐药性局灶癫痫,对癫痫放电在三维空间内进行实时记录,为"解剖-电关联分析"及精确外科切除提供客观依据。尽管这种方法被部分欧洲癫痫中... 详细信息

立体定向脑电图(SEEG)在上世纪60年代诞生于法国,由***和***共同发明。SEEG为一种介入方法,可用于耐药性局灶癫痫,对癫痫放电在三维空间内进行实时记录,为"解剖-电关联分析"及精确外科切除提供客观依据。尽管这种方法被部分欧洲癫痫中心专家沿用长达数十年,然而,仅在近十年来才在世界范围内逐渐推广应用。在当代医疗实践中,SEEG不仅为诊断方法,也被用于治疗,如射频热凝治疗等。为达到临床上更加合理应用SEEG的目的,我们认为需要有正式指南,为此成立了特别工作组,由全法国各地大型癫痫中心(过去连续5年中每年完成SEEG超过10例)专家组成。先由工作组会议形成初步建议,然后由全体专家依据已有方法学对其进行评分。指南第一部分包括下列主题内形成框架建议:SEEG适应证与局限性;SEEG计划与实施;外科技术;电生理操作技术;SEEG解读;SEEG引导下射频热凝。指南的第二部分,由各个专家小组基于现有文献以及他们个人经验对这些议题的具体内容进一步详述。这项工作旨在向应用SEEG的癫痫中心提供了解法国专家共识的机会,尤其是那些正处在起步阶段的癫痫中心,可以作为参考蓝本。该指南的编写得到法国临床神经生理学会、国际抗癫痫联盟法国分支机构的支持。

关键词：成年人儿童耐药癫痫癫痫外科局灶癫痫指南介入检查立体定向脑电图热凝

Accelerated protons with energies up to 70 MeV based on the optimized SG-Ⅱ Peta-watt laser facility

在线全文

学校读者我要写书评

暂无评论

High Power laser Science and Engineering 2023年第5期11卷 127-136页

作者： H.H.An W.Wang J.Xiong C.Wang X.Pan X.P.Ouyang S.Jiang Z.Y.Xie P.P.Wang Y.l.Yao N.Hua Y.Wang Z.C.Jiang Q.Xiao f.C.Ding Y.T.Wan X.liu R.R.Wang Z.H.fang P.Q.Yang Y.E.Jiang P.Z.Zhang B.Q.Zhu J.R.Sun B.Qiao A.l.lei J.Q.Zhu Shanghai Institute of laser Plasma China Academy of Engineering PhysicsShanghaiChina Shanghai Institute of Optics and fine Mechanics Chinese Academy of SciencesShanghaiChina Center for Applied Physics and Technology Peking UniversityBeijingChina National laboratory on High Power laser and Physics ShanghaiChina

The target backsheath field acceleration mechanism is one of the main mechanisms of laser-driven proton acceleration(lDPA)and strongly depends on the comprehensive performance of the ultrashort ultra-intense lasers used as the driving *** successful use of the SG-II Peta-watt(SG-II PW)laser facility for lDPA and its applications in radiographic diagnoses have been manifested by the good performance of the SG-II PW ***,the SG-II PW laser facility has undergone extensive maintenance and a comprehensive technical upgrade in terms of the seed source,laser contrast and terminal *** experiments were performed using the maintained SG-II PW laser beam,and the highest cutoff energy of the proton beam was obviously ***,a double-film target structure was used,and the maximum cutoff energy of the proton beam was up to 70 *** results demonstrate that the comprehensive performance of the SG-II PW laser facility was improved significantly.

关键词： laser-driven proton acceleration SG-II Peta-watt laser target normal sheath acceleration

Safety assessment methodology for a German high-level waste repository in clay formations

在线全文

学校读者我要写书评

暂无评论

Journal of Rock Mechanics and Geotechnical Engineering 2017年第5期9卷 856-876页

作者： M.Jobmann A.Bebiolka V.Burlaka P.Herold S.Jahn A.lommerzheim J.MaBmann A.Meleshyn S.Mrugalla K.Reinhold A.Rübel l.Stark G.Ziefle DBE TECHNOlOGY GmbH Eschenstra 55 Peine D-31224 Germany Bundesanstalt für Geowissenschaften und Rohstoffe (BGR) Stilleweg 2 Hannover D-30655 Germany Gesellschaft fur Anlagen- und Reaktorsicherheit (GRS) gGmbH Theodor-Heuss-Stra 4 Braunschweig D-38122 Germany

In the ANSICHT project that was jointly carried out by DBE TECHNOlOGY Gmb H,BGR,and GRS g Gmb H,two generic geological site models were used to develop a first draft of a methodology to demonstrate the safety of a high-level waste(HlW) repository in argillaceous formations in Germany,taking into account the regulatory *** main results of the project are characterised by the developed repository concepts adapted to the geological *** specific quantifications of the integrity criteria and their exemplary application with calculational proofs were used to demonstrate the integrity of the host *** development of site-specific fEP(features,events,and processes) cataloges provided a complete system description for evaluation of the repository *** developed work flow of the demonstration concept illustrated the complete sequence of the safety proof in a transparent *** shows that various steps have to be performed,possibly iteratively,to provide a successful safety *** results form a useful tool in the pending search for a HlW repository site,especially when providing a basis for comparing safety analyses of different sites in Germany.

关键词： Clay Radioactive waste Safety demonstration method Barrier integrity fEP(features events and processes) cataloge