annulation

On the Mixed Fundamental Problem in an Elastic Annulation

弹性圆环域的混合基本问题

The efficient method is compatible with several functional groups. ( 4) Recent advance in transition-metal-catalyzed annulation of alkynes for the synthesis of naphthalene derivatives was summarized.

该方法具有高效、良好的官能团兼容性；（4）综述了近年来过渡金属催化炔烃环化反应合成萘衍生物的研究进展；然后在介绍了锌盐催化下萘的衍生物的合成。

Electron-deficient conjugated systems are often involved in a variety of annulation reactions as electrophiles. However, the phosphine-catalyzed annulations of electron-poor conjugated systems are rarely touched.

缺电子共轭体系作为亲电试剂可参与多种环化反应，而膦催化下其参与的环化反应却鲜有报道。

The Clinical Observation of Chinese Crude Drug Treatment by Stages on Menoxenia after Putting Annulation

中药分期治疗放环后月经不调的临床观察

Result: A new type fiber-annulation thickening on intracavitary cell wall, was discovered in medical material power.

结果: 在药材粉末中发现一种新型纤维 — 其腔内细胞壁环纹增厚.

A developmental model was put forward, which included adjusting the administrative area, cultivating a growth-pole by using the whole superiority, forming a economic union and promoting the economic development for inner ring to outer annulation.

据此提出调整行政区划和产业布局，集中优势培育增长极，建立区域经济联合体，实行圈层梯度推进的发展模式。

Thus, in this dissertation three novel phosphine-catalyzed annulation reactions of electron-deficient conjugated systems have been systematically investigated, and the following results have been achieved. 1.

因此，本论文系统地探索了三类膦催化下缺电子共轭体系参与的新颖环化反应，并取得了以下结果。

Cantilever Racking: It is fit for long material, annulation, boards, and irregular goods.

悬臂式货架适用于放长物料，环形物料，板材和不规则物料。

Based on frauhofer diffraction integral formula, the calculation and testing method of I_0 ( annulation)/ I_0 ( aperture) for different obstruction ratio of double reflection optical system are described in this paper.

本文从夫朗禾费积分公式出发，论述了不同遮拦比的双反射光学系统I0（环）/I0（孔）的计算与测试方法，并通过计算和测量获得了有实用价值的数据。

Follow-up Measurement of Plastic Mitral Annulation with 2-DE and Color Doppler Ultrasound

人工二尖瓣环成形术后的二维与彩色多普勒超声随访检测