检索结果-南通市图书馆

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

北京地铁光华路车站过桥桩施工技术

施工技术 2007年第1期36卷 24-26页

作者：吕波北京五维地下工程有限责任公司北京100039

北京地铁光华路车站采用分离岛式结构,车站中洞与2个侧洞均要穿越山海丹过街天桥桥桩,为保证施工安全,在天桥不能拆除的情况下,分别考虑了双侧壁导坑法、桩基托换法以及直接穿越法。经过综合分析比较,最终采用洞内桩侧注浆,辅以支撑加... 详细信息

北京地铁光华路车站采用分离岛式结构,车站中洞与2个侧洞均要穿越山海丹过街天桥桥桩,为保证施工安全,在天桥不能拆除的情况下,分别考虑了双侧壁导坑法、桩基托换法以及直接穿越法。经过综合分析比较,最终采用洞内桩侧注浆,辅以支撑加固的直接穿越法,工程获得圆满成功。

关键词：地铁桥桩双侧壁导坑法桩基托换

Etablierung eines tiermodells des hepatozellul ren Karzinoms durch den Einsatz von allogenischer Implantationstechnik

在线全文

学校读者我要写书评

暂无评论

Journal of Huazhong university of Science and technology(Medical Sciences) 2001年第3期21卷 222-224页

作者：钱骏冯敢生

Etablierung eines tierexperimentellen Modells des hepatozellularen Karzinoms (HCC) bei ACI-Ratten durch den Einsatz von allogenischer Implantationstechnik und Beobachtung durch die MR-untersuchung. Bei einer mannlichen ACI-Ratte wurde die tumorzellen von Morris Hepatoma 3924A in die Flanke subkutan injiziert. 13 tage danach erfolgte die Implantation eines soliden tumorfragments (1 mm 3 ) aus dem gewachsenen tumor subkapsular in den linkem Leberlappen bei anderen mannlichen ACI-Ratten (n=12). 14 tage nach Implantation wurden die tumorvolumina kernspintomographisch bestimmt. 14 tage nach Implantation wurde der isolierte und solide Lebertumor bei allen ACI-Ratten kernspintomographisch beobachtet. Das durchschnittliche tumorvolumen betrug hierbei 0,090±0,008 cm 3 . Die Angehrate der tumorimplantation war 100 %. Eine auffallende Hypointensitat der Lasion im Vergleich zum umgebenden Lebergewebe im t1w-Bild und eine massig vermehrte Signalintensitat im t2w-Bild mit inhomogener Struktur waren bei allen implantierten Ratten erkennbar. Mit einer guten Angehrate des Implantations und geeignetem tumorwachstumsverhalten steht dieses Verfahren zur Etablierung eines tiermodells des HCCs zur Verfugung. Es ist einfach zu kontrollieren und leicht reproduzierbar.

关键词： hepatozellulres Karzinom ACI-Ratte tiermodell Implantation

Achieving superior strength-ductility synergy in a heterostructured magnesium alloy via low-temperature extrusion and low-temperature annealing

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & technology 2023年第32期163卷 32-44页

作者： H.Wang D.t.Zhang C.Qiu W.W.Zhang D.L.Chen Guangdong Key Laboratory for Advanced Metallic Materials Processing and Forming National Engineering Research Center of Near-net-shape Forming for Metallic MaterialsSouth China University of TechnologyGuangzhou 510640China Department of Mechanical and Industrial Engineering Toronto Metropolitan University(formerly Ryerson University)350 Victoria StreetTorontoON M5B 2K3Canada

A low-alloyed Mg-1.2Zn-0.1Ca(wt.%)alloy was fabricated via low-temperature extrusion and annealing at 250℃for different times(10,30,and 90 min)to attain heterostructures with different fine-grained fractions,focusing on the effect of heterostructure on the mechanical *** dynamic recrystallization(RX)occurred during extrusion at 150℃,and a lamellar structure consisting of fine RX grains and coarse unRX grains was *** subsequent annealing promoted static RX in the as-extruded alloy,leading to an increased fine-grained fraction from 67%to 95%.Meanwhile,the co-segregation of Zn and Ca atoms impeded the migration of grain boundaries,thus achieving a fine grain size of 0.8–1.6μ*** sample annealed for 10 min with a fine-grained fraction of 73%and an average RX grain size of 0.9μm exhibited a superior combination of high yield strength(305 MPa)and good ductility(20%).In comparison,an excellent elongation of 30%was achieved in the alloy with a nearly fully-RXed microstructure and an average grain size of 1.6μm after 90 min annealing,despite a lower yield strength of 228 *** unRX grains,the hard orientation with(01–10)parallel to the extrusion direction and high-density dislocations made it more difficult to deform compared with the RX grains,thus producing hetero-deformation induced(HDI)*** fine grains and high-density dislocations,HDI strengthening is the key to achieving the superior mechanical properties of the low-alloyed Mg alloy.

关键词： Low-alloyed magnesium alloy Low-temperature extrusion Annealing Heterostructure Mechanical properties

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

固体火箭助推器再入声环境分析

导弹与航天运载技术(中英文) 1983年第12期 86-96页

作者： t.Coffin R.E.Dandridge u.W.Haddock 冯振兴

1.引言航天飞机运载器是一个复杂的组装件。它由轨道飞行器、外贮箱以及二个固体火箭助推器组成。这种航天飞机至少在下十年内将作为“自由世界”主要的空间运输系统。航天飞机方案的效能高,关键之点在于其许多系统和部件在多次飞行任... 详细信息

1.引言航天飞机运载器是一个复杂的组装件。它由轨道飞行器、外贮箱以及二个固体火箭助推器组成。这种航天飞机至少在下十年内将作为“自由世界”主要的空间运输系统。航天飞机方案的效能高,关键之点在于其许多系统和部件在多次飞行任务中可以重复修整、重复使用,

关键词：防热结构裙部固体火箭助推器声环境弹道参数滚转角热层声谱图包络线统计值发动机数据采集数据处理缩尺模型试验模型方程攻角迎角

Morphological Comparison of Five Varieties of <i>Colocasia esculenta</i>(L.) Schott in Anambra State, Southeastern Nigeria

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18期6卷 2819-2825页

作者： Chinelo A. Ezeabara C. u. Okeke J. E. Amadi A. I. Izundu Bibian O. Aziagba P. t. Egboka C. D. udechukwu Department of Botany Nnamdi Azikiwe University Awka Nigeria

Comparative morphological study of five varieties of Colocasia esculenta (L.) Schott present in Anambra State, Nigeria was carried out, in order to furnish plant taxonomists with information which could be of great help in delimitation of the varieties. Significant difference was established at p the result showed that adaxial surface of “kochuo” had a purplish dot on the centre, abaxial leaf surface had a conspicuous purplish colour at the point of attachment to the leaf, and the cormels had numerous striking vertical purple stripes on the surface. there was presence of foliaceous (leaf-like) appendages at the veins of the abaxial surface of the leaf of “ogeriobosi”. the leaf length ranged from 35.6 ± 7.70 cm (“kochuo”) to 49.9 ± 3.55 cm (“ogeriobosi”). Petiole length of “ogeriobosi” was the highest (63.3 ± 3.83 cm), whereas the least was Colocasia esculenta var. antiquorum (26.67 ± 2.20 cm). the corm length ranged from 4.10 ± 0.10 cm (Colocasia esculenta var. antiquorum) to 8.60 ± 0.35 cm (“ogeriobosi”), while the cormel length ranged from 3.70 ± 0.96 cm (Colocasia esculenta var. antiquorum) to 7.03 ± 0.36 cm (“ogeriobosi”). this work has revealed diagnostic and differential morphological characters, which could be useful for identification and description of varieties of C. esculenta. In addition, it provided additional information which might be helpful in resolving the on-going controversy in the taxonomy of Colocasia, which would, in turn, probably lead to possible delimitation of C. esculenta.

关键词： Colocasia Corms Cormels Diagnostic Characters Foliaceous Appendages Morphological Characters Plant taxonomy

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

现代英语惯用法简明词典

现代英语惯用法简明词典

thermoluminescence Responses of Photon and Electron Irradiated Ge- and Al-Doped SiO_(2) Optical Fibres

作者： F.t.·伍德(F.t. Wood)

来源：南通市图书馆图书评论

学校读者我要写书评

暂无评论

Chinese Physics Letters 2012年第2期29卷 208-210页

作者： H.Wagiran I.Hossain D.Bradley A.N.H.Yaakob t.Ramli Department of Physics Universiti Teknologi Malaysia81310 SkudaiJohor Darul TakzimMalaysia Department of Physics University of SurreyGuildfordGU27XHUK

We carry out a comparison of the thermoluminescence (tL) response of photon and electron irradiated Ge- and Al-doped SiO_(2) optical fibres,as well as cross-comparison with that of *** is made with 6 MeV electrons and 6 MV photons,for doses ranging from 0.2 Gy to *** commercially available Al- and Gedoped optical fibres produce a linear dose-tL *** tL yield for both of the doped fibres and also for tLD-100 is greater for electron irradiation than for photon *** tL yield of the Al-doped fibres is a small fraction of that of Ge-doped fibres (by a factor of 25),the Ge-doped fibres offering a response of 59%o of that of tLD-100.

关键词： irradiation Electron irradiated

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

异质信念下存款保险的存款稳定效应测算

系统工程理论与实践 2015年第4期35卷 817-827页

作者：吕筱宁秦学志大连理工大学管理与经济学部大连116024

构建了存款人异质信念下存款保险制度的存款稳定效应测算模型.首先刻画了具有异质信念的资金持有者的决策模式及正常经济形势下投保前后银行系统存款规模的变化,以此度量正常经济形势下存款保险的存款稳定效应;其次,计算隐性存款保险制... 详细信息

构建了存款人异质信念下存款保险制度的存款稳定效应测算模型.首先刻画了具有异质信念的资金持有者的决策模式及正常经济形势下投保前后银行系统存款规模的变化,以此度量正常经济形势下存款保险的存款稳定效应;其次,计算隐性存款保险制度和显性存款保险制度下极端事件发生后银行系统的存款流失率,以二者之差度量极端事件发生后显性存款保险制度的存款稳定效应.最后,为验证模型效果,对投保比例及其他各参数变化的若干情景进行了模拟分析.结果表明:存款保险的稳定效应与投保比例正相关;经济形势越不稳定、银行系统信息透明度越高,存款保险的存款稳定效应越显著.

关键词：存款保险异质信念存款规模存款流失率稳定效应

在线全文

学校读者我要写书评

暂无评论

功能性纤维及其在针织面料中的应用

上海纺织科技 2008年第12期36卷 4-6页

作者：吕慧安徽职业技术学院纺织工程系安徽合肥230051

介绍了功能性纤维的定义和分类,通过对抗菌防臭、吸湿排汗、抗紫外线、防辐射、保健、抗静电、医疗和环保功能性纤维性能的分析,介绍了它们在针织面料中的应用。

关键词：功能性高分子纤维抗菌性吸湿性防辐射性抗静电性针织物