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Alkylamine reaction with dialkyl cyanodithioiminocarbonate was catalyzed by quaternary ammonium salts at room temperature to yield 3-alkylamine-5-amino-1,2,4-triazole in good quality and high yields. After imidization and reaction with an α,β-unsaturated acid derivative, the reaction intermediate was hydrolyzed in the presence of a Lewis acid to obtain the target product.

烷基胺与氰基亚胺硫代二甲酯在季氨盐催化作用下得到质量好、收率高的3-烷氨基-5-氨基-1,2,4-三氮唑,进一步经过亚胺中间体并与α,β-不饱和酸酯作用后,中间产物在Lewis酸催化作用下水解得到三唑嘧啶酮。

In this paper, the asymptotic estimations of initial value solution are obtained for an eigenvalue problem with three-point boundary conditions by use of the iterate method.

本文运用叠代法,先得到一个带三点边条件特征值问题初值解,并构造了一个整函数ω,其零点集合与带三点边条件特征值问题的特征值集合重合。

I switched from 8 to run on behalf of MT in the first 86 laps run, and I can skilled MT substitution in 9 of 7 file blacklist beat Mercedes CLK 500, the use of two or three hours.

从我开着8代MT的86跑第一圈算起,到我可以熟练的在9代用MT的7档梅塞德斯 CLK 500击败黑名单为止,用了两、三个小时。

Analytic personage points out, mode of electronic business affairs is in those who experienced generation to provide commercial information and news service " the mode in A ", of website of business affairs of electron of course of study of the 2nd act on one's behalf " PPG mode " hind, the 3rd kind of mode -- the industry B2B pattern that has information platform and distribute medium of communication at the same time begins to be invested a bound to chase after hold in both hands.

分析人士指出,电子商务模式在经历了第一代提供商业资讯和信息服务的"阿里模式"、第二代行业电子商务网站的"PPG模式"后,第三种模式——同时拥有信息平台和经销渠道的行业B2B模式开始受到投资界追捧。

Vizcaino allowed three earned runs in an inning, and Henn allowed four, on pinch hitter Victor Diaz's grand slam, in his two-thirds of an inning.

维兹卡因诺一局掉三分,韩恩在三分之二局掉四分,包括代打滴芽汁加料油炸的满贯炮。

Diethylthiophosphoryl chloride was synthesized by reacting phosphorus thiochloride with anhydrous alcohol in the presence of NaOH, and then a novel phosphorus-nitrogen- and sulfur-containing flame retardant, 1, 4-di(O,O-diethyl thiophosphoryl imine) benzene, was synthesized via the reaction of diethylthiophosphoryl chloride with p-phenylenediamine.

以三氯硫磷与无水乙醇在NaOH存在下合成了二乙基硫代磷酰氯,然后再与对苯二胺反应合成了新型的含磷、氮、硫的膨胀型阻燃剂:1,4-二(O,O-二乙基硫代磷酰亚胺基)苯。

3D-CTM (Coupled Thermo-Mechanical Forming Simulation) software for precision forging process of aero-engine blade was developed. The key technologies of 3D coupled rigid-viscoplastic thermo-mechanical FEM simulation of blade forging process were studied systematically. By using the remeshing method of contracting from the boundary to the inner, new mesh system from old distorted mesh system can be obtained. A method of modifying the position of nodes touching on the die according to its original normal was proposed to avoid "dead lock" problem due to uncontinuity of normal of scatted die meshes. The pseudo-static iterative algorithm was used to simplify the coupled thermo-mechanical computation. In particular, formulations to determine relaxation factor β was established for rigid viscoplastic FEM adopting penalty function method, and an improved cubic factor rapid algorithm derived from these formulations was proposed by combining with the advantage of advance and retreat search method.

采用基于边界构形的内缩法,实现了三维畸变网格的重新划分;提出了初矢修正法对触模节点的位置进行修正,解决了由于离散的模具网格的法矢不连续造成的&死锁&问题;采用准静态迭代法简化了速度场和温度场耦合计算过程;特别是针对减速因子β的选取,建立了适用于三维复杂成形过程刚粘塑性罚函数法有限元三次因子法的计算公式,并结合进退搜索法提出了改进的三次因子快速算法,提高了模拟计算效率和稳定性,在此基础之上,开发了面向叶片精锻过程的三维刚粘塑性热力耦合有限元模拟分析系统(3D-CTM),系统的可靠性得到了圆柱体镦粗的验证。

Methods 136gastric cancer patients,who underwent total gastrectomy using threereconstruction proceˉdures between1993and2002,were retrospectively evaluated with their digestive symptoms and nutritional status.The three procedures are Braun anastomosis,Roux-en-Yreconstruction and Roux-en-Y with P-shaped anasˉtomosis.Results Both RY and PRY reconstruction have superiority in anti-esophagus reflux than Braun anastomosis.

1993~2002年行全胃切除术的136例胃癌患者,分别采用袢式空肠代胃+Braun吻合、单纯Roux-en-Y吻合和Roux-en-Y吻合+P形代胃三种方式重建消化道,对这些患者进行回顾性分析,以术后的消化道症状和营养状况作为评价依据。

When we assign through an insert iterator, the iterator inserts a new element. There are three kinds of inserters, which differ as to where elements are inserted

通过插入迭代器赋值时,迭代器将会插入一个新的元素。C++语言提供了三种插入器,其差别在于插入元素的位置不同。

Melamine formaldehyde resin is a thermosetting polymer,spinnability and flexibility of fiber are poor.

三聚氰胺甲醛树脂是热固性高聚物,成纤性差,成纤纤维韧性差;通过苯代三聚氰胺、聚乙烯醇对三聚氰胺树脂进行改性,提高了树脂溶液的可纺性,所制纤维的柔韧性得到了提高。

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推荐网络例句

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊!不用提了。提到肉,真是糟透了。

Tristan, I have nowhere to send this letter and no reason to believe you wish to receive it.

Tristan ,我不知道把这信寄到哪里,也不知道你是否想收到它。