查询词典 Nb

In the research of prescription, through the experiments we knew the influence from the Nb_2O_5 or Y_2O_3 single donor doped on high-temperature PTC ceramic, and got the curve graph drawing the resistivity and mixing quantity. In order to restrain lead volatilize and mix the rang of donors to neutralization the harmful acceptor impurity in raw materials, adopt the prescription design of Nb_2O_5 and Y_2O_3 double donors-doped. From the result, we know that regulation proportion of Nb , Y double donors, can make high-temperature PTC ceramics semiconducting, the pottery demonstrates good electric performance.

为了能够更有效的抑制铅挥发，并且使掺杂范围能够更好的调节，以"中和"原材料中的有害受主杂质，在配方设计中采用了Nb_2O_5和Y_2O_3双施主掺杂的配方，由结果可知，适当的调节Nb、Y双施主掺杂总量及Nb、Y掺杂比例，可以使高温PTC陶瓷充分的半导化，陶瓷表现出良好的电性能。

Major conclutions from this study can be summarized as following:1. On mineralogy, rutiles, apatites, epidotes and vein minerals from UHPM rocks were firstly and systematically studied, by detailed petrography and mineral-chemistry investigation, some mineral or mineral assemblage with special composions or texture were firstly found in UHPM rocks from Sulu-Dabie, for example, corrudum, magnesite, high-Ti biotite and garnet were found as inclusions in rutiles from eclogites, Nb-Fe rutile and zoned Si-Y apatite were found in gneiss, epidote / allanite with euhedral zones like magmatic genesis were found in elogites and gneiss, a lot of minerals with high REE, HFSE, LILE and volatiles were found in veins of gneiss.

在矿物学方面，首次较为系统地研究了超高压变质岩中的金红石、磷灰石、绿帘石等副矿物，并通过详细的岩相学和矿物化学研究，首次在苏鲁-大别超高压变质岩中发现了一些具有特殊成分/结构的矿物或矿物组合，如在榴辉岩金红石中发现了刚玉、菱镁矿、高钛黑云母和石榴石矿物包裹体，在片麻岩中发现了Nb-Fe金红石和具有自形环带结构的高Si-Y磷灰石，在榴辉岩和片麻岩中发现了具有类似岩浆成因的自形生长环带结构的绿帘石/褐帘石，在片麻岩的脉体中发现了大量富含稀土元素REE、高场强元素HFSE(Nb、Ta、Zr、Ti)、大离子亲石元素LILE(K、Th、U、Sr、Ba)，以及挥发性组份(CO_2、F、P、S)的特殊矿物，丰富并提升了超高压变质岩的矿物学研究。2。

Positron annihilation lifetime and coincidence Doppler broadening measurements have also been performed on alloying TiAl. The experiments results indicate that the effect on the electron structure of TiAl alloy is different when different amounts of Nb are doped.

2利用符合多普勒展宽与正电子湮没寿命测量方法，分析讨论了不同含量Nb对Ti–49Al合金的掺杂效应，研究结果表明：不同含量Nb掺杂对TiAl合金的电子结构影响是不同的，从而导致了对合金性能的不同影响。

The microstructure of interface of high pressure natrium lamp with differentlifetime has been studied by means of TEM, and the influence of interface struc-ture on the quality of Al_2O_3/Nb seal has been revealed.

并利用透射电子显微镜，研究了不同寿命的高压钠灯中玻璃焊料与Nb界面的显微组织结构，揭示了界面结构对Al_2O_3-Nb封接质量的影响。

The trace Ti,Nb is useful to get fine grain microstructure and higher efficiency, and the result of independent Ti is better than that of Ti and Nb simutaneously.

加入微量Ti、Nb可以有效细化晶粒，而且对提高阳极的电流效率有很好的促进作用，单独加入Ti的效果好于同时加Ti、Nb。

Mengyin komatiites are characterized by typical spinifex texture,high MgO,low TiO_2,and unde- pleted Al.They show positive Rb,Ba,Sr and U anomalies,depleted LREE,flat HREE and low total REE content.There occurs fractionation of HFSE from REE,and Nb/Nb~* is positive.These data indicate that the source of komatiites is depleted in LREE and enriched in HFSE.

山东蒙阴科马提岩具有典型的鬣刺结构，高镁低钛，铝不亏损，具有正的Rb、Ba、Sr、U异常，轻稀土元素亏损，重稀土元素平坦，稀土元素总量很低，高场强元素与稀土元素发生分异，Nb/Nb^＊〉1，与加拿大蒙罗镇科马提岩地球化学特征和同位素特征相似。

Wolframite might crystalize at about 750℃. Independent minerals of Nb and Ta were not found under 800～600℃, 100× 10〓Pa and 0.64wt% F conditions, although Nb〓O〓 content might reach 1160×10〓 at 600℃.

随着岩浆温度从800℃降低到600℃，熔体中Nb〓O〓含量逐渐升高，600℃时Nb〓O〓含量可达1160×10〓，但在实验产物中仍然没有发现铌的独立矿物，更未发现钽的独立矿物。

LaNi〓 catalyst was metallurgically combined with V、Nb and TiFe by ball milling, and then V-LaNi〓、Nb-LaNi〓 and TiFe-LaNi〓 nano-compound materials formed.

利用机械球磨方法使LaNi〓催化剂有机地与室温难活化储氢金属V、Nb、TiFe合金结合，形成V-LaNi〓、Nb-LaNi〓、TiFe-LaNi〓纳米复合储氢材料。

Kalamaili suture zone is an important plate boundary in north Xinjiang, and there are plenty of Neopaleozoic volcanic rocks around itThese volcanic rocks are enriched in LILEs and relatively depleted in HFSEs, and they are also characterized by high Nb, Zr, TiO2 contents and Zr/Y, Nb/Y ratios, and depleted SrNd isotopesThe characteristics of these volcanic rocks suggest that they were produced in postcollisional periodThe postcollisional volcanic rocks around Kalamaili suture zone become younger from west to east, which indicates that this suture zone entered postcollisional period gradually from west to east, and reflects that the Kalamaili Ocean had been closed gradually from west to eastAs to the Kalamaili suture zone in postcollisional period, the lithosphere extended and thinned, and the asthenosphere materials upwelled and melted partially, and intensive mantle convection occurred, leading to a plenty of mantlederived magmas underplating the suture zoneThe lithospheric mantle metasomatized by fluid in subduction period melted partially under decompression and high temperature, the resulting melts contaminated the underplating asthenospheric materials, and the erupted lavas became the Neopaleozoic postcollisional volcanic rocks

卡拉麦里缝合带是北疆的一条重要界线，沿该带广泛发育晚古生代火山岩。这些火山岩具有LILE相对富集、HFSE相对亏损的特征，且具有较高的Nb、Zr、TiO2含量和Zr/Y、Nb/Y比值，SrNd同位素主要表现出亏损的特征。综合分析表明，这些火山岩形成于后碰撞期。对卡拉麦里缝合带而言，从西向东后碰撞火山岩的时代逐渐变新，表明该缝合带从西向东逐渐演化进入后碰撞期，这从侧面反映了卡拉麦里洋盆是从西向东逐渐关闭的。对卡拉麦里缝合带而言，在后碰撞期，岩石圈伸展减薄，软流圈地幔物质上涌并发生部分熔融，加上地幔对流作用强烈，使得缝合带下产生了大规模的幔源岩浆底垫；先前在洋壳消减期被流体交代提取过的岩石圈地幔也在低压高温下发生部分熔融，形成的熔体混染了底垫的软流圈物质并喷发，形成了晚古生代的后碰撞期火山岩。

The Ti-ion was replaced 100% by Fe、Nb on the octahedra B sites in the SrTiO_3, and the mole percentage of Fe、Nb were changed to be in accordance with the components of A_nB_nO_(3n-1) and A_mB_mO_(3m+2) series of the perovskite that n、m are integer.

介绍用Fe、Nb对SrTiO_3中八面体B晶位上的Ti离子进行百分之百的取代，调节Fe、Nb的摩尔百分比，使其符合类钙钛矿的A_nB_nO_(3n-1)及A_mB_mO_(3m+2)系列n、m取整数的组分。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。