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4月19日,中国第八届花卉博览会(以下简称花博会)指定官方用车交车仪式在常州举行。30辆车身喷绘有花博会会徽"蝶恋花"和吉祥物的"和和、美美"图案的东风俊风CV03,交付给花博会组委会,将作为花博会的工作用车驰骋在常州市及周边地区的大街小巷,成为城市的一道靓丽的风景。 相似文献
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An LES simulation of flow over an accumulator unit of an underwater compressed air energy storage facility was conducted. The accumulator unit consists of three touching underwater balloons arranged in a floral configuration. The structure of the flow was examined via three dimensional iso surfaces of the Q criterion. Vortical cores were observed on the leeward surface of the balloons. The swirling tube flows generated by these vortical cores were depicted through three dimensional path lines. The flow dynamics were visualized via time series snapshots of two dimensional vorticity contours perpendicular to the flow direction; revealing the turbulent swinging motions of the aforementioned shedding-swirling tube flows. The time history of the hydrodynamic loading was presented in terms of lift and drag coefficients. Drag coefficient of each individual balloon in the floral configuration was smaller than that of a single balloon. It was found that the total drag coefficient of the floral unit of three touching balloons, i.e. summation of the drag coefficients of the balloons, is not too much larger than that of a single balloon whereas it provides three times the storage capacity. In addition to its practical significance in designing appropriate foundation and supports, the instantaneous hydrodynamic loading was used to determine the frequency of the turbulent swirling-swinging motions of the shedding vortex tubes; the Strouhal number was found to be larger than that of a single sphere at the same Reynolds number. 相似文献
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公路绿化应大力发展宿根花卉 总被引:3,自引:0,他引:3
宿根花卉是指植株地上部分开花、结实,萎蔫后,地下部分形成发达的根部,可以露地越冬,翌年再次萌发、生长、开花、结实的草本花卉,如芍药、菊花、蜀葵、天人菊等。宿根花卉是现代园林中不可缺少的组成部分,国外也大量应用于公路绿化。目前,我们在公路绿化中要求做到“三季有花,四季有绿”,我认为大力发展宿根花卉的栽植有利于达到这个目的。回宿根花卉的用途和优点1.l宿根花卉在公路绿化中有以下几点用途问)起到警示作用。宿根花卉中开黄、红色花的种类,如天人菊、金鸡菊、蜀葵等花期长,花丛密集,在公路两侧形成一条花带,且颜… 相似文献
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城市花街景观是一项长期而且不断完善的工作。如何更好地树立花街的窗口形象,更好地发挥美化城区的职能,开拓创新和持续发展,是在管理工作中需要不断思考的问题。介绍了城市花街管理的模式,有关经验可供相关专业人员参考。 相似文献
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杜鹃花(Rhododendron)别名:映山红/迎春花,原产地喜马拉雅山区,不丹等。杜鹃花以其色彩鲜艳闻名於世,花色丰富多变,有红、白、粉红、紫、青白以及白底红边、红点等,为不少爱花之人及雅士文人所锺爱。唐朝诗人白居易在其诗中将之喻作“花中西施”。在近600种杜鹃花中,香港可以见到近200个品种。 相似文献
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根据北京市花卉交易市场的现状,探讨北京市花卉交易市场建设中存在的主要问题,并据此提出解决这些问题的有效的对策,以促进北京市花卉产业的快速发展. 相似文献
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从90年代初开始,中国花卉业开始高速发展起来。截止到2005年中国花卉出口额达到了1。43亿美元。随着我国花卉业的加速发展,花卉出口方面存在的问题也越来越明显。表现出来问题的主要有:花卉出口品种单一,花卉出口目的国相对集中,花卉出口利润偏低等。本文从科技、政策、人才等几个方面,分析了形成这些问题的原因,并在此基础上提出了促进我国花卉出口的一些措施。 相似文献
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