查询词典 Nb

Greywacke samples of Middle and Late Triassic collected from Hongcan well in Zoige were analyzed by ICP-MS for REE and trace elements. The result shows that these samples were originated continental crust because they enriched in Cs,Rb,Th and high REE contents and depleted in Sr,Nb and Ta. Negative Eu anomalies and strong differentiation between heavy and light REE are significant. Both the contents and ratios of the inactive trace elements and the results based on discriminant diagrams indicated that the sedimentary tectonic setting of Zoige Basin was dominated by continental island arc and the sediment in this basin was strongly affected by continental island arc between Middle and Late Triassic.

对若尔盖地区的红参一井内中三叠世中期和晚三叠世中期的37个杂砂岩样品进行了ICP-MS微量元素分析，其结果显示这些砂岩样品具有Cs、Rb、Th等元素富集，Sr、Nb和Ta亏损，稀土元素总量较高，且负Eu异常和轻重稀土分异明显等壳源物质的特征；而微量不活动元素的含量及比值特征以及构造环境判别图解的判别结果表明：若尔盖盆地中三叠世中期到晚三叠世中期的沉积构造环境为大陆岛弧，沉积物源受到大陆岛弧的强烈影响。

The effects of RE-Nb on microstructure and mechanical properties of cast 3Cr2MoNiWV hot-work die steel were investigated by SEM, TEM and AJ-1 electronic tensile test equipment.

用扫描电镜、透射电镜和万能电子材料拉伸试验机研究了RE—Nb对铸造3Cr2MoNiWV热锻模具钢组织和力学性能的影响。

Compared with the joint brazed with Cu-Ti filler metal, the content of Cu in the reaction layer adjacent to the stainless steel is higher than the joint brazed with Cu-Co-Ti filler metal, so is the content of Nb in brazing seam.

与Cu-Ti钎料接头相比，Cu-Co-Ti钎料接头中钎缝与不锈钢侧的反应层中Cu含量较高，钎缝中Nb含量也较高。

The concentrations of trace elements Rb、Sr、Y、Zr、Nb and Ba in Liaoning lavas determined by XRF and ICP-MS solution methods.

XRF对辽西火山岩样品中微量元素Rb、Sr、Y、Zr、Nb和Ba含量的测定值与ICP-MS的测定值之间的相对偏差一般小于10％。

The valence electron number is N_=4(s~2d~2), N_v=5(s~2d~3), N_=6(s~1d~5),N_=5(s~1p~4) for the transition elements Ti, V, Mo, Nb, respectively, and N_=3(s~2p~1) for thenon-transition element Al.

过渡族元素Ti，V，Mo，Nb的价电子数分别为4(s~2d~2)，5(s~2d~3)，6(s~1d~5)，5(s~1d~4)非过渡族元素Al的价电子数为3(s~2p~1)。

The aim of this thesis is to explore new MWDC with cation-deficient perovskite structure in A_5B_4O_(15) system. According to the characteristic of A_5B_4O_(15) perovskite structure, series of new titanates / tantalates Ba_(5-x)La_xTi_xTa_(4-x)O_(15)(x=1~3) were prepared, characterized. The dielectric properties were measured. Furthermore, the effects of Nb~(5+) substitution Ta~(5+) at B-site in Ba_3La_2Ti_2Ta_2O_(15) ceramic on structure and dielectric properties were studied.

本论文的主要目的是在A_5B_4O_(15)系列中探索新型类钙钛矿结构高性能微波介质陶瓷，进行了Ba_(5-x)La_xTi_xTa_(4-x)O_(15)(x=1～3)系列钛钽酸盐陶瓷的制备、结构与介电性能研究工作，并研究了材料Ba_3La_2Ti_2Ta_2O_(15)的B位Nb~(5+)离子取代Ta~(5+)离子对材料结构和介电性能的影响。

Based on these results, we suggest that the new peak results from the electron transfer from small polarons （Nb4+Li） to free polarons （Nb5+Nb）.

基于上述实验结果，认为该峰应该起源于电子在相邻的小极化子（Nb4+Li）和自由极化子（Nb4+Nb）之间的跃迁。

The effect of Mo and Nb platings as well as chemical etching on diamond nucleation and growth on cemented carbide YG6 are studied and discussed thoroughly.

深入研究了镀Mo、镀Nb及化学腐蚀等表面改性方法对YG6硬质合金基体上金刚石形核及生长的影响，分析了这些方法影响金刚石形核的机理。

It should be noted that not only in the complex perovskite like BaO3,(X=Mg, Zn, Co, Ni, Mn: Y=Nb, Ta) but also in the compounds with tungsten bronze structure such as Ba6-3xLn8+2XTi18O54, they are consisted of corner-sharing oxygen octahedra and the ratios of ion in B site to ion in A site are usually larger than one.

值得注意的是业已开发出来的材料不论是复合钙钛矿BaO_3，(X=Mg，Zn，Co，Ni，Mn；Y=Nb，Ta)还是钨青铜结构，它们都是由氧八面体共顶连接，而且氧八面体内、外阳离子比例都等于或略大于1，因此，我们推测在B位与A位阳离子比例略小于1的类钙钛矿结构中极有可能存在具有优良介电性能的新材料。

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致力于装订设备系列产品：ZYH660D折页机，JBT50/3D4D椭圆胶订包本机，JBT50/3A椭圆型包本机，JBT50/4A椭圆型包本机，JBB51B胶订包本机，DQ440B半自动骑马订书机，TD102单头铁丝订书机，DH11-AB订书订盒机，YP-608/808型机械书芯压平机，NB-60型自动粘背机，小型高性能粘背机，SX-01锁线机，DK-2型自动打孔机，DK-4型打孔机，压背机。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。