查询词典 NI

This essay deduces the power sum formula of an arbitrary arithmetic progression step by step on the basis of Euler-Maclaurin formula,and then achieres the compute formula of natural number power sum -∑ni=1i m.

前n个自然数的方幂和，∑ni=1im是一个古老的难题。

All the compositions satisfy the same electron concentration $e/a$=1.5 and average atomic radius 0.1496 nm as those of the Zr$_{60}$Al$_{20}$Ni$_{20}$ bulk metallic glasses.

根据等电子浓度和等原子尺寸判据设计了四种Zr--Ti--Al--Ni系合金，并用激光诱导燃烧合成的方法制备了材料。

In this thesis, the dynamic processes of boron segregating to grain boundaries during cooling in Fe-40%Ni alloy are first studied by boron autoradiography technique and transmission electron microscopy.

本文首先应用硼径迹显微技术和透射电镜观察了Fe-40%Ni合金在连续冷却过程中硼向晶界非平衡偏聚的发展过程。

Therefore, the soil Ni activity should be more concerned for the environmental soil science development, and the environmental management.

因此，土壤Ni的活性比之其全量是人们更应关注的问题，是环境土壤学应该研究的问题，也是环保管理系统中应该明确的问题。

The filmy generation of radioisotope Ni-63 is used at the Beta particle that generate electricity.

喷射性同位元素Ni-63的薄膜发生用于发电的Beta微粒。

In this paper, vacuum furnace brazing was carried out by using Ni Cr alloys as braze filler metals.

本文在真空炉中用钎焊的方法，用Ni Cr合金钎料，适当控制钎焊温度、保温时间和冷却速度，实现了金刚石与钢基体的高强度连接。

In this paper the surface strengthening of the die and mould are studied by brush electro-plating Ni-W coating.

本文研究了电刷镀Ni-W合金镀层的方法对模具表面进行强化。

In this paper, oligomerization catalyst was prepared by impregnation and the performance of Fe-Ni catalyst was studied for mixed butene oligomerization.The effect of preparation conditions, reaction conditions and molding methods of powder catalyst was separately studied on the performance of mixed-butene oligomerization.

本文采用浸渍法制备了齐聚催化剂，考察了负载型Fe-Ni催化剂在催化混合丁烯齐聚反应中的性能，研究了催化剂的制备条件、反应条件和成型等对混合丁烯齐聚性能的影响。

Using Mo powder,Fe-B alloy powder,and Fe powder as raw materials,and adding Cr,Ni and C alloy and agent polyvinyl butyral,Mo_2FeB_2 hard alloy was clad on a Q235 steel substrate to form a new type of cladding material with excellent wear and cor- rosion resistance property by means of vacuum liquid phase sintering technique.

以Mo粉、Fe-B合金粉、Fe粉为基本原料，掺加适量合金元素Cr，Ni，C，以及有机粘结剂聚乙烯醇缩丁醛，采用真空液相烧结法在Q235钢基体表面制备Mo_2FeB_2硬质合金覆层，获得了力学性能良好且耐磨抗蚀的新型硬质合金覆层材料。

We have calculated calcium cobalt oxide and the Ni-doped one by LAPW method and DFT-DVM method.

本文对Ca_3Co_2O_6和掺Ni的Ca_3Co_2O_6的电子结构进行了LAPW和量子化学方法计算。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。