查询词典 ring

Pymetrazine is chosed as the lead compound, and 21 compounds were firstly designed and synthesized. These compounds were characterized by introducing phenyl derivatives with different functional groups to replace pyridine ring with the isosteric principle and the method of homogeneous synthesis and reasonable biologically designing in order to find new compounds with potential biological activity. These compounds were confirmed by IR, H NMR and MS spectra.

本文选取吡蚜酮为先导化合物，运用电子等排理念，综合类同合成、生物合理设计的方法，引入含有不同官能团的苯基衍生物替代吡蚜酮的结构中心吡啶环，设计合成了21个未见文献报道的化合物，寻找具有潜在生物活性的新三嗪酮类化合物，通过核磁共振氢谱、红外光谱、质谱等手段进行了结构表征，并验证正确。

By using cadmium acetate as catalyst, polyitaconic anhydride was prepared through ring opening polymerization of itaconic anhydride.

以衣康酸为原料合成了衣康酸酐，并在乙酸镉的催化作用下通过开环聚合得到了聚衣康酸酐。

By using cadmium acetate as catalyst, polyitaconic anhydride was prepared through ring opening polymerization of itaconic anhydride.

环酯单体在不同引发/催化体系作用下的开环聚合是制备可生物降解脂肪族聚酯的主要方法。

Sandy: Jeffery, please accept this ring with my love.

王维嘉，请接受这见证我两爱的戒指。

In this article, high-pure lactic acid and ethanol acid were used to synthesized PLGA by direct condensation polymerization, and zinc octanoate of low nocuity was used as katalyst, instead of stannous octanoate to synthesize PLGA by the way of opening ring.

本文首次采用高纯度乳酸、乙醇酸直接缩聚合成无催化剂的端羧基PLGA，并分别采用了低毒性辛酸锌代替辛酸亚锡为催化剂通过开环聚合法合成端羧基／酯封端PLGA。

The light emitted from a Keplerian ring around the objects with strong gravitational field should be affected by Doppler shift, gravitational redshift and deflection of light. The line profiles for a faraway observer are dominated by these effects. In this paper the precise solutions of line profiles for the Keplerian rings in the Schwarz-schild case have been obtained by means of the kinetic equation for photons.

对于一个围绕强引力场物体作开普勒运动的环状发光物，它所发射的光线要受多普勒频移，引力红移和光线偏折等效应的作用，这种作用决定了远处观察者所看到的谱线轮廓，本文利用光子输运方程方法，求出在Schwarzschild度规中的开普勒环所发射的谱线的轮廓的精确解。

Hβ zeolite ; seven-member-ring ketal ; 1; 4-butanediol ; synthesis ; catalyst

Hβ；七元环缩酮； 1； 4-丁二醇；环己酮；合成；催化剂

If Ketu is adverse - The ring should be iron and weight should be 7 Carats.

如果克图是不利的-应在环铁和重量的7克拉。

In addition the following items Extended Body Gate Valve at home should be standing, so that water can be at home when the accident for the repair work is more speedy and convenient: repair water pipes dedicated tape, fiberglass tape, ring gas resin thickening agent, Chuai Kora.

另外家中应常备下列物品，这样可以在家庭用水发生意外时，为抢修工作带来更多快捷和便利：修补水管专用胶布、玻璃纤维胶布、环气树脂黏剂、搋子等。

Main types of plain film, network congestion and to improve the Kugel patch, and its chosen primarily on the basis of the type of hernia, hernia ring size, abdominal transverse fascia and other factors determine the extent of the weak, the quality is good, will only be applied to different targets .

补片主要类型有平片、网塞、改良kugel补片，其选用主要根据疝的类型、疝环大小、腹横筋膜薄弱程度等因素决定，质量都是好的，只是适用对象不同。

Alternatively, the con- trollers can use the synchronous rectifier itself or loss- less inductor current-sensing methods to provide overload protection with lower power dissipation.

另外，康威特罗勒斯可以使用同步整流器本身或亏损减少电感电流检测方法，以提供低功耗过载保护。

Mr. Dauber's other Schatz hangs in his home movie studio.

多伯把沙兹的另一件作品挂在家里的电影室。