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结构观察     
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  structure observation
     Structure observation and clinical significance of sacral roots after long term electric stimulation in dogs
     长时间电刺激后骶神经根的结构观察及临床意义
短句来源
     Synthesis, structure observation and low field emission of CN_x nanotubes
     CN_x纳米管的制备、结构观察及低场致电子发射性能研究
短句来源
     2. Retinal structure observation: 42 cats were divided into two groups by FFA: the group of recanalization within 3 days (group Ⅰ , n=16) and the group of recanalization after 3 days (group Ⅱ, n=26).
     2、视网膜结构观察:根据FFA检查结果将42只模型动物分为两组:Ⅰ 1-3天再通组(n=16); Ⅱ 3天后再通组(n=26)。
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     Myocardium structure observation in the dog perfused by three myocardial protection methods
     三种停搏液心肌保护实验研究中心肌结构观察
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     The cuttlebones,harvested from cuttles,undergo the chemical reaction in high temperature and high pressure for a certain time. The products are qualitatively analysed,and spacial structure observation and cytocompatibility are tested.
     以乌贼骨为原料,高温高压条件下进行水热反应,对反应产物进行定性分析、空间结构观察和细胞相容性实验。
短句来源
  structural observation
     REVERSIBILITY OF ANTIFERTILITY ON GOSSYPOL: FINE STRUCTURAL OBSERVATION IN HUMAN TESTIS
     服棉酚后久未恢复者睾丸微细结构观察——对棉酚抗生育可逆性的探讨
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     STRUCTURAL OBSERVATION OF BLASTOCYSTIS HOMINIS CYSTS IN DIFFERENT ENVIRONMENT
     不同环境中人芽囊原虫包囊的结构观察
短句来源
  microstructure observation
     Microstructure observation of adiabatic shear bands in cutting low alloy steel
     切削高强度结构钢形成的绝热剪切带微结构观察
短句来源
  structure examination
     THE STRUCTURE EXAMINATION OF FUSION MEMBRANES FROM DEFICIENT THYLAKOID MEMBRANES WITH CRISTA VESICLES
     残缺类囊体膜与嵴膜小囊的融合膜结构观察
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      structure observation
    The mechanism of the electrorheological (ER) effect in two types of liquid crystalline polymer (LCP)/dimethylsiloxane (DMS) blends was investigated by rheological measurements and by structure observation under electric field and shear flow.
          
    The decay of the ALPEX low-level jet: Fine structure observation by aircraft data
          
    Differential thermal analysis, X-ray diffraction and structure observation clearly confirmed that the eutectoid reaction rate was drastically enhanced by the addition of a small amount of Cu and its rate decreased with decrease of Cu content.
          
      structural observation
    Structural observation of heterogeneous poly(N-isopropyl acrylamide-co-acrylic acid) hydrogels in highly hydrated states
          
    Detailed structural observation carried out with the aid of scanning electron microscopy and wide-angle X-ray scattering evidenced that the structure of extruded rods is uniquely fibrous and highly oriented throughout the profile.
          
    This would explain the high mobility of aqueous fluids suggested by structural observation and stable isotope analysis.
          
    The neurogenous origin of the spindle cell component was substantiated by immunoreactivity for S-100 protein as well as by the fine structural observation of a regular basement membrane coating and a profusion of Luse bodies.
          
    Nano-structural observation of carbon black dispersion in natural rubber matrix by three-dimensional transmission electron micro
          
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      microstructure observation
    The microstructure observation shows that spinel carbon bricks have a high degree of preferred orientation.
          
    Microstructure observation and mechanical behavior modeling for limnetic nacre
          
    The microstructure observation revealed that oxidation and loading accelerated new flaw nucleation and growth resulting in stress corrosion cracks.
          
    Microstructure observation using scanning electron microscopy and transmission electronmicroscopy revealed a distribution of nanoparticles with dimensions in the range 10-100 nm.
          
    The microstructure observation reveals that the dominant fracture mode of 7039 alloy is intergranular and that of 7075 alloy is transgranular.
          
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      structural observations
    The behaviour of the mean square displacements and direct structural observations suggest that melting initiates at the surface, in agreement with recent experimental observations.
          
    Structural observations have been carried out, mostly by transmission electron microscopy, for a study on the oxidation characteristics of zirconium.
          
    Histochemical and fine structural observations on the alimentary tract of Aphroditidae and Nephtyidae (Polychaeta Errantia)
          
    Fine structural observations on two congenitally lymphoedematous dogs
          
    Petrological and structural observations are generally inconclusive but indicate in some places an Alpine age for the migmatite formation.
          
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      其他


    In the reseaches on the anatomical structure of an apex during itsontogeny of Brassica pekinensis Rupr. we kave observed that in thegermination-phase an apex of B. pekinensis Rupr. is a tunica-corpusstructuee which changes gradually into cytohistological zonation stru-cture in the seedling phase. In the rosette-phase an apex is a typicalcytohistological zonation structure which consist of five zones: tunica;submantle; central-mother cell zone; combium-like zone and rib-meristemzone. However, the apex in the...

    In the reseaches on the anatomical structure of an apex during itsontogeny of Brassica pekinensis Rupr. we kave observed that in thegermination-phase an apex of B. pekinensis Rupr. is a tunica-corpusstructuee which changes gradually into cytohistological zonation stru-cture in the seedling phase. In the rosette-phase an apex is a typicalcytohistological zonation structure which consist of five zones: tunica;submantle; central-mother cell zone; combium-like zone and rib-meristemzone. However, the apex in the early phase of cabbaging becomes areproductive apex but which is dormant and has no combium-like zonein its structure. In a late-phase of cabbaging the resting reproductiveapices begin to elongate somewhat and differentiat obviously floralprimordia, and active dividing cells in an apical meristem constitute apartern of reversed cone. From previous mention we can come to a con-clusion: the apical structure changes with different phase during onto-geny of the plant. Each structure of an apex bears close relationship tothe activities of the apex. During the rosette period a cambium-like zoneand rib-meristem zone play an important role in growth in thickness of anapex and in moving a number of the produced leaves primordia towardouter periphery. Changes of an anatomical structure occur earlier than anew morphological characteristics as a type of metabolism changes. Altho-ugh an apical structure in cabbaging-phase has changed into that of a re-productive apex, but as the reproductive apex is dormant, the nutrimentscan be applicated to growth of the bulb-leaves. Therefor, we held thatcabbaging bear relation with differentiation of the floral buds.

    对白菜(Brassica campestris ssp.pekinensis(Brassica Pekinensis Rupr.)个体发育过程中顶端解剖结构的观察发现:白菜顶端在胚胎期及萌发期是原套——原体结构;幼苗期逐渐变成分区结构。由五区组成:原套、亚外套、中央母细胞区、形成层状细胞区和肋状分生组织区。结球早期苗端变成生殖顶端,但呈潜伏状态;这种顶端结构中,没有形成层状细胞区。结球后期,潜伏的生殖顶端略有延长并分化明显的花原基;顶端分生组织中有活跃分裂能力的细胞构成一个倒园锥体的形状。以上观察说明:顶端结构是随个体发育的不同时期而变化的,每种结构和顶端活动有着密切的关系;莲座期形成层状细胞区和肋状分生组织区的配合活动,使顶端直径增加,并把已形成的叶原基移向外围。当新陈代谢类型发生变化的时候,内部解剖构造的变化比新的外貌形态特征出现得早。虽然结球期顶端变成生殖顶端,但是由于这时的生殖端呈潜伏状态,营养物质可用于球叶的生长。因此,我们认为:结球和花端分化有着密切的关系。

    Observations on the micrestructures cf the specimens of sintered synthetic diamonds bonded \vith Si.Ni and pure nickel respectively have been rcac'e. We find that in the foimer caie it is the SiC and Si-Ni phases formed in its process which play the vole of cementation, and the diamond ccmpects obtained are more thermally stable but more brittle, while in the latter ease the cementotion is resulted from the bondage through solid solution of nickel and the diamond compact \l.vs obtained is consequently characterized...

    Observations on the micrestructures cf the specimens of sintered synthetic diamonds bonded \vith Si.Ni and pure nickel respectively have been rcac'e. We find that in the foimer caie it is the SiC and Si-Ni phases formed in its process which play the vole of cementation, and the diamond ccmpects obtained are more thermally stable but more brittle, while in the latter ease the cementotion is resulted from the bondage through solid solution of nickel and the diamond compact \l.vs obtained is consequently characterized by better toughness. However,, the thermal expansion coefficient of Ni differs significantly from that of diamond. It is probably for this "reason that diamond compact bended with nickel is unsuitable for utilization at high temperature.Finally, put forward in the present article are some suggestions relevant to the improvement of the quality of the sintered diamonds,

    分别对以Si、Ni为粘结剂及纯镍为粘结剂的人造金刚石聚晶作了显微结构的观察。结果表明:前者是以生成的SiC和镍硅相起粘结作用,因此,这种聚晶有较好的热稳定性及较大的脆性;后者是以镍的固溶体(Ni)起粘结作用,所以韧性较好.但是,镍与金刚石的热膨胀系数相差甚大,这似乎是使得镍聚晶不宜在温度较高的环境中使用的原因。最后,本文对提高聚晶的质量提出了参考意见.

    The present paper which has been chiefly contributed toward a studying on hot-pre-ssing silicon nitride doped with 5%(wt) magnesia is divided into three sections:(1)Manufacture——by proper choice of flowing rate of gases, temperature and duration ofnitridation, we have succeeded in preparing a raw material containing 90~95%ofα-siliconnitride.The selection of technological parameters of hot-pressing including temperature,pressure and time are described.(2)Physical and mechanical properties——the bending strength...

    The present paper which has been chiefly contributed toward a studying on hot-pre-ssing silicon nitride doped with 5%(wt) magnesia is divided into three sections:(1)Manufacture——by proper choice of flowing rate of gases, temperature and duration ofnitridation, we have succeeded in preparing a raw material containing 90~95%ofα-siliconnitride.The selection of technological parameters of hot-pressing including temperature,pressure and time are described.(2)Physical and mechanical properties——the bending strength of specimens preparedunder optimun technological conditions is 7500~8200kg/cm~2 at room temperature or 7000kg/cm~2at 1100℃, and it begins obviously to decrease at 1200℃. The specimens prepared are qui- te resistant to oxidation up tO 1200℃, however at 1400℃ their oxidation rate is rapidlyincreased, the weight gain in an air environment at 1300℃ obnys roughly the parabolicrule.The abrasion coefficient is considerably small at wearing against steel №45, the dryabrasion coefficient is determined to be 0.5, and it is lowered further down to 0.09~0.11while the wearing parts have been lubricated.Thermal expansion coefficients from roomtemperature to 1200℃ are α=1.75~2.95×10~(-5). and hardness H_R=91~92. (3)Microstructure and wetting angle measurement-the electron micrographs have re-vealed that the hot-pressing bodies have a texture of equiaxial grains of silicon nitride inter-laced with fiberous grains. The wetting angle of silicon nitride by MgO .SiO_2 and 2MgO.SiO_2 melts approaches 20°.Therefore it may be reasonably thought that the liquid phaseformed at high temperatures would take an important part in sintering process. Finally, the effects of technological parameters on the strength of hot-pressing siliconnitride were also discussed, and therefrom the approaches to the improvement of hightemperature strength were suggested.

    本文主要研究添加5%(重量)MgO为助熔剂的热压氮化硅系统,分为以下三部分: (1)氮化硅制备工艺。通过选择适当氮化温度、时间和气体流量,能制备α相控制在90~95%范围内的Si_3N_4粉末。同时叙述了热压工艺:包括温度、压力,保温时间等工艺参数的选择。 (2)热压氮化硅机械物理性能:室温强度在7500公斤/厘米~2~8200公斤/厘米~2,1100℃时强度为7000公斤/厘米~2,1200℃时开始下降明显,1200℃以下抗氧化性良好,1400℃氧化速率迅速增加,1300℃的氧化增重基本上符合抛物线规律;摩擦系数小,与45~*钢对磨时干摩擦系数为0.5,有润滑油情况下,为0.09~0.11;从室温到1200℃的膨胀系数α=1.75~2.95×10~(-6);硬度H_R=91~92。 (3)热压氮化硅微观结构观察和润湿角测定。电镜照片表明其织构主要由纤维状形貌颗粒和部分等轴形貌颗粒组成。Si_3N_4与MgO·SiO_2和2MgO·SiO_2的润湿角接近20°,表明它是有液相参与的烧结。 本文还对一些工艺因素变化与强度关系进行讨论,并指出进一步改进高温强度的途径。

     
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