查询词典 x-rays

The catalyst was characterized by transmission electron microscopy, X-ray diffraction and energy dispersion X-ray spectrum.

利用透射电镜、X-射线衍射和能量散射X-射线能谱对催化剂进行了表征，并用循环伏安实验评价了催化剂对甲醇电化学氧化的电催化活性。

My name is X X,and you?

我的名字是X X，你呢？

Gels with the compositions of x ZrO〓(1-x) SiO〓(x=10～40vo1%) were prepared by using fumed silica and zirconyl chlorides as precursors.

采用气凝氧化硅和氯氧化锆为原料，以共沉淀法制备了xZrO〓(1-x)SiO〓(=10-40vol％)系列粉料。

The structural evolution of ultrafine NiB and NiP amorphous alloys prepared by c hemical reduction during the annealing process is investigated by X-ray absorpt ion fine structure, X-ray diffraction and differential thermal ana lysis techniques.

摘 要：采用X射线吸收精细结构，X射线衍射和差热分析等方法研究了以化学还原法制备的NiB和NiP超细非晶态合金催化剂在退火过程中的结构变化。

The invention concerns a process for preparing heterocyclic carbenes of general formula in which R1, R2, R3 and R4 are identical or different and mean saturated or unsaturated, straight-chain, branched or cyclic, unsubstituted or substituted C1-C10 alkyl, C2-C5 alkylidene, C2-C5 alkylidine, C7-C19 aralkyl or C6-C14 alkyl groups, R3 and R4 can also stand for hydrogen or form jointly anellated, substituted or unsubstituted groups with between 3 and 7 carbon atoms and X stands for carbon or nitrogen, R3 being dropped if X is nitrogen.

本发明涉及一种制备通式Ⅰ的杂环碳烯的方法，其中在通式Ⅰ中，R1、R2、R3和R4是相同的或不同的，并且是饱和的或不饱和的，直链、支链或环状的，未取代或取代的C1－C10－烷基、C2－C5－亚烷基、C2－C5－次烷基、C7－C19－芳烷基或C6－C14－芳基基团，R3和R4可以是氢或它们一起形成具有3－7个碳原子的稠合的、取代或未取代的基团，X是碳或氮，并且当X是氮时，不存在R3。

But as in the case of type-A materialism, either X is functionally analyzable, in which case the second step fails, or X is not functionally analyzable, in which case the first step fails.

但是，就如A类的情况，或者X是功能上可分析的，在这种下，第二步失败；或X不是功能上分析的，在这情况下第一步失败。

Fe(superscript 3+) occupied both tetrahedral sites in spinel block and trigonal bipyramid sites in mirror plane for LaFeMnAl(subscript 12-x-y)O19 (x=0.5, 1) hexaaluminate.

LaFeMnAl(下标 12-x-y)O19(x=0.5， 1)中Fe以Fe(上标 3+)位于六铝酸盐尖晶石结构中的四面体位和镜面层结构中的三角双锥位，其中后者为N2O分解的主要活性中心。

According as the four modes in a symmetric waveguide, that one of modes is symmetric or anti-symmetric about X axes or Y axes, are X polarized or Y polarized odd mode or even mode, we calculated the polarized coupling characteristics using Cassinian curves as boundaries of the couplers.

本文还根据对称波导中对称于或反对称于x轴或y轴的四个模式分别为x偏振或y偏振的奇模或偶模的原理，用Cassinian曲线表示耦合器介质波导的边界，计算了耦合器的偏振耦合特性。

The result "If X is a solution of a categorial equation, then there exists an unique essential solution Y such thatY X"makes it possible that the essential catgories of a word could generate all possible syntactic categories by some deductive rules.

定理&对于范畴方程的任意一个解x，都存在唯一的本质解Y使得Y x&使得我们可以通过一定的演绎规则对词w的本质范畴作扩张以得到w的所有句法范畴。

Call Ceil to obtain the lowest integer greater than or equal to X. The absolute value of X must be less than MaxInt.

调用ceil函数，返回大于或等于x的最小整数值。X的绝对值一定要小于最大整数值。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。