查询词典 S-curve

A novel planar chiral diferrocenylimine-diols 6 was synthesized by the condensation of R, S(subscript p-1-(2-diphenyl hydroxyl methyl) ferrocenylethylamine [R, S(subscript p-4] with phthaldehyde in anhydrous ethanol, and was crystallographically characterized.

通过R，S(下标 p-1-（2-二苯基羟甲基）二茂铁乙胺[R，S(下标 p-4]和对苯二甲醛在无水乙醇中的缩合反应合成了一种新型平面手性双二茂铁亚胺二醇化合物6，并经X-射线衍射分析它的晶体结构。

On decadal timescale, the highest and second highest values of Ca〓 and Mg〓 occurred in 550's and 380's respectively, which are related to cold and arid climatic conditions.

在十年尺度上，Ca和Mg离子的最高值和次高值分别出现于550's和380's，它们均与冷干气候相联系。

S —008 deflocculant and S —009 paint remover, are just to aim to treat the un-useful / wasting paint inside the painting-room, it can decompose the paint and let it loss glutinosity to float up with all shaped flocculation, and can make water clear but without the wasted paint deposition, without to adhibit to the equipment surface.

S —008悬浮剂与 S —009去漆剂是针对喷房内废油漆之处理，使油漆分解，失去粘性，全部成团上浮使水质变清，废漆不沉淀，不粘于设备表面，废水可达国家三级排放标准，大大延长喷涂设备使用寿命。

In chapter four, the preperation of ytterbium diiodide was examined. The reductive cleavage of Se-Se bond and S-S bond induced by ytterbium diiodide was investigated. The reaction of diselenides and disulfides with allylic bromide promoted by ytterbium diiodide was also examined. The intermolecular Barbier-type reaction induced by ytterbium diiodide was studied. In the last section of this chapter, the intermolecular reductive coupling of nitriles with azides induced by samarium diiodide was investigated.

第四章，研究了二碘化镱的制备方法，以及二碘化镱作为一种优良的单电子转移试剂在有机合成中的应用：二硒醚的Se--Se键和二硫醚S-S键的还原断裂，及其在合成烯丙基硒醚，硒代酯和烯丙基硫醚，硫代酯中的应用，实验结果表明二碘化镱也能促进分子间的Barbier反应，而文献认为二碘化镱不能促进分子间的Barbier反应；最后研究了二碘化钐促进的叠氮化合物与腈的交叉还原偶联反应，一步高收率地制备脒的方法。

With stress calculation analysis and experimental verification, it could be concluded that when b/s is small (.2), the disalignment could be restored by polishing. When grater, by repair welding with width no more than 100mm Meanwhile, when controlling stress level is .5, allowable value of disalignment and angle deformation could be .7s.

通过应力计算分析和实验验证可以得出：当b/s较小(b/s.2)时，错边可以用磨削方法进行修复；当b/s较大时，可用堆焊方法进行修复，且堆焊宽度H不超过100mm同时，在控制应力水平不超过1.5时，错边量和角变形量的和可以允许在不超过0.7s的范围内。

But copper dissolves less, and silver、nickel and iron is hardly dissoluble, because of passivation of black Ag〓S and Cu〓S layer and sulfide film of nickel and iron.

在碱性硫脲溶液中，银、铜几乎不溶解是因为黑色的Ag〓S和Cu〓S膜的钝化，铁、镍不溶解亦是其硫化物膜钝化的结果。

Using 2-bromo-ethanesulfonic acid sodium salt ,α,ω- binary primary amine and dodecanoic acid as the main raw materials, drawing support from two-step synthesis of experiments—Alkylated reaction and Schotten-Baumann acylation, A series of LAS(12-s-12) gemini surfactants were synthesized.

并以2-溴乙基磺酸钠、α，ω-二元伯胺、月桂酸等为主要原料，借助胺基的烷基化和Schotten-Baumann酰基化反应制备了α，ω-烷撑-双钠盐LAS(12-s-12)表面活性剂，联结基团为亚甲基—(CH2)s—(S=2，4，6，8，12)，取得以下进展

There is no reason to downweight the well-being of a Chinese peasant relative to a Senegalese farmer just because China's population is larger than Senegal's.

没有理由对downweight 中国农民的福利相对Senegalese 农夫正因为中国's 人口比塞内加尔大的's 。

The enzymolytic products identified were:diisopro-pylaminoethanethiol through the breakdown of P-S bond, and its oxidized product, N, N'-dithiodiethylene-bis ; and diisopropyla-minochloroethane through the breakdown of S-C bond.

VS与电鳐乙酰胆碱酯酶作用的主要产物是： P—S键断裂产物二异丙氨基乙硫醇，该化合物在水溶液中不稳定，可进一步氧化为N，N＇-双二异丙氨基乙基二硫醚；S—C键断裂产物二异丙氨基氯乙烷。

And selects separately parabola y=ax2+b (X,+2S supposes 100 points, X,+S supposes 60 points), y=a2+b (X,supposes 100 points, X,±3S supposes 60 points) and y=ax2+b (X,+3S supposes 100 points, X,+S supposes 60 points) as the formulation score parametric equation, and determines various indexs evaluation criteria of the bodily shape in primary selection of eurythmic gymnastics in our country.

并分别选取抛物线y=ax2+b（X，+2S设为100分，X，+S设为60分）、y=a2+b（X，设为100分，X，±3S设为60分）和y=ax2+b（X，+3S设为100分，X，+S设为60分）为制定分数的参数方程，并在此基础上确定我国艺术体操初级选材的身体形态各指标的评价标准。

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。