切割

The expressions of dihedral angle and cutting angle of the intersecting groove are deduced by way of space analytical geometry.

利用空间解析几何原理推导了多管、板相贯坡口的两面角和实际切割角的表达式，建立了切割多管、板相贯坡口的数学模型。

The mechanical property testing shows that the seamless PLLA tubes perform excellent radial strength,which indicates that the mechanical properties of biodegradable stents made of these tubes was supposed to be excellent.PLLA and its composites were first used in preparing seamless tubes as antecedency of laser-cut biodegradable coronary stents in china.Finite element analyses of the biodegradable coronary stent model indicate the explorative design basically meets the requirement of reasonable and applicable stents.There is not such kind of research yet in domestic.Optimum laser-cuttting parameters of CO2 laser was cauculated based on experiential formula,within it,biodegradable coronary stents,especially those with complex structure would be manufacutured from seamless tubes quickly by laser microprocessing with high consistency to the design model.The processing efficiency of the CO2 laser demonstrated in experiential formula by us will play an important guiding role in manufacturing biodegradable stents by laser-processing.Our stents that ascribed to laser-cutted,slotted tube stent are proved to be biodegradable, self-expandable and good biocompatible,basically reach the international level on the aspest of manufacturing procedures and design.

研究结果表明：壳聚糖改性材料综合性能优于纯PLLA，更适合于作为可降解冠脉支架的原材料；自主设计的探索性自膨胀管状闭环型可降解冠脉支架的性能符合冠脉设计要求，设计、验证生物可降解冠脉支架模型的研究在国内还未见报道；制备的改性PLLA无缝管的力学性能优越，可通过激光切割获得冠脉支架，这是国内首次采用聚乳酸材料来制备通过激光加工出可降解冠脉支架的无缝管；二氧化碳激光器加工精度能达到加工要求，加工出来的血管支架名义设计与实测值误差小，实现了冠脉支架、尤其是带有复杂外观设计冠脉支架的快速化、规范化加工，对二氧化碳激光器加工聚乳酸材料的效果研究在国内外属于首创，获得的经验公式对日后的深入研究有重要的指导意义；制备的支架为激光切割管状闭环型冠脉支架，支架外观设计、支架加工手段、支架的性能都基本接近国际水平，支架样品符合设计的理念，可以实现自膨胀功能。

Therefore, it has important theoretical significance and practical value that develop the investigation on the NC automatic programming for laser cutting.

因此，开展激光切割数控自动编程的研究，具有较大的理论意义与实际应用价值，同时对降低国外同类激光切割的数控自动编程的软件的价格有重要作用。

In vitro cleavage reaction was performed at 37℃ for 1h under the presence of Mg++. The cleavage product was analyzed by polyacrilamide gel electrophoresis. After autoradiography, the cleavage rate was counted by image analysis.

体外切割作用在Mg++的存在下，37℃反应1小时，进行聚丙烯酰胺凝胶电泳，放射自显影后经图像分析计算出切割率。

The main problems in boron carbide ceramic machining are introduced,and the laser technique is used to machine boron carbide.

介绍了碳化硼陶瓷加工中存在的主要问题，将激光技术应用于加工碳化硼陶瓷上，研究出一种新型加工方法，设计出两种有效的激光切割方法并对碳化硼陶瓷进行切割。

Of stylized flower-head cluster design composed of oval cabochon and facetted sapphires of light and dark hues, highlighted by brilliant cut diamonds.

优雅的花朵造型，镶嵌浅蓝与深蓝色椭圆形鹅蛋及多面切割蓝宝石，点缀明亮切割钻石

The wide flexible openwork band formed of three latticework motifs set with cabochon rubies and small circular cut diamonds, connect by geometrical set with further circular cut and baguette diamonds.

柔软灵活的镂空宽手链，由3个镶嵌鹅蛋红宝石及小颗圆形切割钻石的格子图案组成，中间由几何图案连接，以更多圆形切割及长方形钻石镶嵌而成

Realistically designed as a floral spray, the two flower-heads set with oval cabochon rubies within an undulated border of brilliant cut diamonds, the stem set with baguette diamonds, the leaves with eight and brilliant cut diamonds.

栩栩如生的花束造型，两朵花的花瓣镶嵌椭圆形鹅蛋红宝石，波浪形边缘镶嵌明亮切割钻石，花茎镶嵌长方形钻石，叶子镶嵌八斜面及明亮切割钻石

Another object of the invention is to efficiently base cut the cane to promote removal of substantially all of the valuable a cane from the field, and to reduce the extended and split cane stubble which promotes disease in the growing cane field.

这项发明的项目三是高效根切装置。这种装置能大大地促进所有有用甘蔗的切割，并将切割后余留在田间的可能导致病害在作物中蔓延的部分撕碎。

Tumefaciens mediated transformation using cotyledonary node as explants was optimized; 3 methods including cutting chapiter, ovary injection and chapiter spreading for pollen tube pathway was compared. Cutting chapiter and ovary injection can both achieve insect resistant gene tranformants.

优化了以子叶节为外植体的农杆菌介导转化技术；比较了切割柱头、子房注射和子房涂抹3种花粉管通道法处理授粉后黄瓜子房的转化效果，切割柱头和子房注射均可成功获得黄瓜抗虫转基因植株。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。