Geo _ info _ _ sitio _ web _ dedicado _ a _ las _ ciencias _ de _ la _ tierra _ sitio web con aplicaciones , enlaces e informaci n ( documentos , art culos y fotografias ) sobre geolog a y otras ramas de las ciencias de la tierra 可控环境农业科技网提供国内外可控环境农业相关科技发展动态、技术创新、学术论坛、会议会展等信息。
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Cylinder radial twisting enlacing machine is an upgrading generation of packaging machine with the function of simple operation , high automatic degree and the layer number of twisting is adjustable so as to reduce the wastage of the products 圆筒径向缠绕捆扎机是包装升级换代的机型，操作方便、自动化程度高，缠绕层数可调，并大大降低产品的损耗。
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Cylinder radial twisting enlacing machine is an upgrading generation of packaging machine with the function of simple operation , high automatic degree and the layer number of twisting is adjustable so as to reduce the wastage of the products 产品说明：圆筒径向缠绕捆扎机是包装升级换代的机型，操作方便、自动化程度高，缠绕层数可调，并大大降低产品的损耗。
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The research work of this article is a part of the " reliability research of cylinders for compressed natural gas vehicles " project which was subsidized by chongqing scientific committee , it aims to research the destructive theory and design theory and method for fiber enlaced composite materials shell , and synthetically use finite element optimal technology to set up composite materials cad system 本文的研究工作是重庆市科委资助项目“天然气汽车气瓶可靠性研究”的一部分，旨在研究纤维缠绕复合材料壳体设计理论及方法和破坏机理，综合运用有限元优化技术建立复合材料壳体cad系统。
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( 2 ) design of the implantating device : some quantity of 316l stainless steel , perform forging and thermal rolling , drawing filament ( diameter 0 . 4mm and 0 . 23mm respectively ) , enlacing and jointing , after that assembling the products into guiding filum , a technical examination was carried out to appraise their physical capability . the second part : experimental study : animal experiments were used to screen and observe its validity and security : under general anesthesia , tracheotomy was performed on the healthy dog , the bronchus was localized using x - ray fluoroscopy fibrobronchoscope and with the help of the implanting equipment , several niti alloy occludes were implanted into the target bronchus of the dogs through the biopsy channel in the fibrobronchoscope ( 2 )推送器的研制：取316l不锈钢热轧,分别拉制成不同直径的不锈钢丝分别用作制作内芯、外环及车制螺丝，再经缠绕、焊接、装配成推送器。对上述两者进行技术鉴定。第二部分：支气管封堵器的实验研究：四种形状的封堵器分四组（上述四种封堵器各12只）进行动物实验，分别观察其安全性与有效性。
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Fiber enlaced composite materials is widely used in engineering project . the mechanics property of the shell is rather complicated when analyzing the affect of composite materials shell ' s interlaminar stresses . the result shows that the interlaminar stresses of composite materials shell will be changed much according to the change of the fiber direction , not only the distribution style , but also the interface which the maxinal interlaminar shearing stresses belongs to 纤维缠绕复合材料壳体在工程实际中得到广泛应用，其壳体力学性能相当复杂，本文在分析复合材料壳体层间应力的影响时，提出了复合材料壳体层间应力随纤维方向的改变有较大的不同，不仅分布形式不同，其最大层间剪应力所在的界面也各不相同。
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A ' method of analyzing the stresses of the lining of fiber enlaced composite cylindrical shell under internal pressure is raised through building the theory equation with putting the ring shaped stiffener on the point of enlancing fiber . the result is good fit with the traditional finite element analyzing system 并结合对承受内压的纤维缠绕复合材料圆柱壳进行了分析，通过建立理论方程提出了把加强环点建立在纤维缠绕处分析圆柱壳内衬应力应变的方法，计算结果与传统有限元分析系统计算结果相吻合。
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Pgla , one biodegradable material , is used to braid the conduits , which integrates the merits of its two aggregate ingredients . it is easy to adjust degrading rate to match the regeneration period of the nerve by changing the proportion of the two ingredients . the conduits are fabricated enlacing 2 . 2 millimeter stainless steel on the braiding machine with 16 spindles using 2700 tex yarns . four conduits with different structures are braided : common braided structure , braided structure using braided ply yarn , braided structure with inserted reinforcing yarn and adding bridge - yarn structure , the last two conduits are new attempts to look for good shape - keeping structure , being able to lead the nerve to regenerate effectively 本课题选用可生物降解材料聚乙丙交酯( pgla )为原料，它兼具两种聚合成分的优点，可以通过调节两者聚合的配比来调节它的降解周期，使与神经再生的周期相吻合。导管的制作是在16锭编织机上采用2700tex纱线进行带芯编织，芯子为直径2 . 2mm的不锈钢丝。共制作四种结构神经导管，分别为普通结构神经导管、编织线结构神经导管、加筋结构神经导管和加芯结构神经导管。
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In this paper the writer thinks that there are new competitors coming into being continuously in the industry with the fall of the entrance barrier , while the distemperedness of the quit mechanism hamper the tailed to retreat , which can not lead to death of the weaker . on the other hand the implicit structural factor as well as its evolvement in the circumstance make the competition wild in the industry and the stronger ca n ' t be strong for long . the price war frequently breaking out is an enlace for the sponsor 笔者认为，进入壁垒的降低使该行业不断出现新的竞争者，而退出机制的不健全又阻碍了失败者的退出，造成弱者不死；而固有的结构性因素及在环境作用下结构性因素的演变导致行业内的竞争激烈，大者不能恒强。
