查询词典 k

1H NMR spectroscopic analysis of aromatic protons combined with theoretical analysis of molecular structures proved the existence of two rotational isomers at 300 K, as well as a rapid interconversion equilibrium at 330 K for both compounds Ⅰ and Ⅱ. However, only one conformer exists for compound Ⅲ and puerarin containing 7-phenolic hydroxyl instead of propyl in A-ring as the case of compounds Ⅰ and Ⅱ. Based on UV-Visible absorption data of neutral and basic solutions, and on the density function calculations, the 7-phenolic hydroxyl group in A-ring was found to be more acidic than the 4'-phenolic hydroxyl group in B-ring. The mechanism of derivation reaction and the structure-reactivity relationship of puerarin as an antioxidant were further discussed.

其中7-丙基葛根素Ⅱ属于新型取代衍生物；变温1H NMR和理论计算结果表明，在300 K时，葛根素和4'-丙基葛根素以单一构型存在；而7，4'-二丙基葛根素和7-丙基葛根素则存在两种核磁可分辨的旋转异构体，当温度升至330 K时，两种异构体可以相互转化；通过对比分析葛根素及其衍生物脱质子产物的紫外可见吸收光谱并结合理论计算，确定了A环上7位酚羟基比B环上4'位酚羟基先脱去质子，并由此进一步阐明了葛根素衍生化反应机理以及在抗氧化作用中可能的活性位点和结构活性关系。

When the stress and displacement fields in a specimen are calculated by finite element method, the stress intensity factors K and K of mixed-mode crack can be obtained immediately by a contour integral.

此方法与积分路径的选择无关，用有限元法计算出远离裂纹尖端的位移场和应力场，就可通过计算绕裂端的围线积分，精确地给出混合型裂纹的应力强度因子KⅠ和KⅡ的数值解。

K∩C∩S. This is the method of using convex analysis to find the conditional extreme value.

根据集合的概念，由几何集K与本构集C求交集，即K∩C，再以此与平衡集S求三者的交集，即K∩C∩S。

Andwe get two results that kinematic measure of the random pairs of needles intersect inconvex body K and the random pairs of needles intersect at a point in convex body Kby calculation. Thereby, the result of geometric probability problem and its inferencesare gained.

通过计算得出针偶与凸体K相交的运动测度和针偶与凸体K相交且针偶的交点属于凸体K的运动测度这两个结果，从而解决了这一几何概率问题，并得到了相关的一些推论。

CvEM::COV_MAT_SPHERICAL - a covariation matrix of each mixture is a scaled identity matrix,μk*I, so the only parameter to be estimated is μk.

每一个混合的协变矩阵都是全N阵，即μk*I，一次唯一的参数就是μk。

Poisson's equation:In space where the source density is ρ, the Laplacian of a : potential U is 2 U = 4πρK, where is the operator del and K is a constant (gravitational constant in case of mass and gravitational potential).

泊松方程：在源密度为ρ的空间中，位场 U 的拉普拉斯算子为： U = 4πρK，。在米-千克其中为 del 算子，K 为常数(质量的万有引力常数和重力势)秒单位制中应去掉常数 4π。

The case that shares from a few netizens can see, because many commutative friendship link is punished by different level,have many websites: K home page, depilate, whole station by K.

从一些网友分享的案例可以看出，有不少网站由于大量的交换友情链接被不同程度惩罚：K首页、拔毛、整站被K。

Give a search the idea of K, broad stationmaster folk makes depilate, how to know a website by K, your meeting discovery is in when you Baidu perhaps inputs Site in the search column such as Google: Xxx.com when, your collect the word that a webpage still can come out when if you are direct in search casing,turning 0; into input Http://www.xxx.com, so congratulation you, you still have little hope, can rescue.

给搜索K的概念，广大站长民间都叫拔毛，如何知道一个网站被K呢，你会发现当你在百度或者Google等搜索栏目中输入site：xxx.com的时候，你的收录变成了零；假如你在搜索框里直接输入http：//www.xxx.com时还能出来一个网页的话，那么恭喜你，你还有一点点希望，可以拯救。

When the temperature is less than 15 K, the PBTCA-Nd~(3+) complex is a ferromagnet, otherwise, it is a diamagnet. Both PPHBT-Nd~(3+) and PPHPHN-Nd~(3+) exhibit the characteristic of soft-magnetic materials at low temperature, the Curie-Weiss temperature are 80 K and 150 K, respectively.

实验结果表明，含咔唑聚合物的稀土配合物PBTCA-Nd~(3+)表现出特殊的软铁磁性，具有一个磁转变温度15 K，低于此温度时配合物是个铁磁体，反之，为抗磁体。

Illustrate with example below: Example 1 be four color wreaths one by one in order is Huang, orange, red, gold color, because of the third wreath is red, resistivity scope is what time several k Ωs Of, the number represented respectively according to Huang, orange dichromatism"4" go into with"3",, it then reads to count for the 43 k Ω.

下面举例说明：例1当四个色环依次是黄、橙、红、金色时，因第三环为红色、阻值范围是几点几kΩ的，按照黄、橙两色分别代表的数"4"和"3"代入，，则其读数为43 kΩ。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。