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排序方式: 共有165条查询结果,搜索用时 31 毫秒
1.
电视节目主持人的语言总是首先受到电视话语、栏目特点的约束,在此基础上又要凸显个人的风格。白岩松、崔永元等优秀节目主持人,其语言或理智深刻、尖锐犀利,或新颖独特、融情于理,或温文尔雅、细腻真挚,或机智幽默、平中见奇,都具有迷人的个人魅力和独特的语言风格,应认真总结优秀语言风格的内在规律及培养途径。 相似文献
2.
INTRODUCTIONAt present, plastic as a substitute for metals in products is the most important mainstay in industrial raw materials. Furthermore, plastic injection molding is one of the most common and versatile methods for mass production of complex plastic parts with excel-lent dimensional tolerance. Since the technology of injection molding has been widely applied in manu-facturing, training on injection molding is of great importance. The traditional approach is to consult some technica… 相似文献
3.
The consolidation behavior of mixed in place cement- and lime/cement-mixed column was studied. Consolidation of the composite
foundation was modeled as a three-dimensional axi-symmetric problem. The authors used the finite difference method to obtain
the pore pressure variation with time at any location below the surface. A computer program developed by the authors was used
to draw some interesting conclusions about the consolidation behaviors of cement- and lime/cement-mixed pile foundation. Finally,
a combined model including the permeability coefficients of cement-mixed piles and soil, was studied and its feasibility was
evaluated.
Project supported by National Natural Science Foundation of China (No. 59908012) and Education Ministry of China 相似文献
4.
吴百中 《温州职业技术学院学报》2011,11(2):56-59
氟塑料衬里阀门是国内广泛应用的耐腐阀门,但其衬里采用的是模压烧结成型工艺,存在较多缺陷。阀门防腐衬里采用注塑成型工艺可解决这一问题。该工艺可大大缩短成型加工周期,降低能耗,减轻劳动强度,提高成品率和防腐性能。 相似文献
5.
吕淑艳 《包头职业技术学院学报》2020,(1):1-2,15
采用逆向思维方法,详细分析了一次性快餐盒盖的成型工艺,并对其结构进行改进设计。为那些以实物为制造基础的产品的设计提供了借鉴,在缩短产品开发周期,提高经济效益方面,起着重要作用。 相似文献
6.
把电磁振动技术引入到金属粉末注射成型中,在一定的工艺条件下,逐步调节振动频率和振幅,制备出不同振动条件的注射型坯,并通过SEM等实验手段对型坯的物料分散状态和微观结构进行研究,以探讨振动频率和振幅对型坯微观结构的影响。结果表明:施加振动后,型坯微观结构均散程度大大提高,且随着振动频率或振幅的不断增大,均散程度逐渐达到最好后,均匀和完善程度有所降低,但仍然好于稳态成型时的状态。 相似文献
7.
黄金岩 《株洲师范高等专科学校学报》1997,(1)
Junior English for China' is based on the 'Five-Step' teaching
method: Revision, Presentation, Drilling, Practice, Consolidation. Each step has its
own particular methodology and requires the teacher to adopt a certain role. This
paper is a discussion of the "Five-Step Method". 相似文献
8.
通过用白灰做胶凝剂的成型材料,控制反应温度在4℃-128℃的范围内,来捕集烟道气中低浓度的二氧化碳、二氧化硫、二氧化氮、一氧化氮,并将其固存在成型材料中,使二氧化碳、二氧化硫矿化成为产品的组成部分,得到多种早强的白灰气硬性产成品,并由此得到二氧化碳、二氧化硫、二氧化氮、一氧化氮枯竭的烟道气。其主要用途是:可用于燃煤发电厂的二氧化碳、二氧化硫、二氧化氮、一氧化氮的减排,并使其固体排放物得到综合利用,得到早强的白灰成型材料产成品。 相似文献
9.
《Journal of Cultural Heritage》2014,15(2):151-158
Nanolime dispersed in 2-propanol was extensively used for the consolidation of wall paintings. The knowledge of the advances of this methodology dealing with all the possible effects associated with the nanolime new material in conservation is fundamental to assess and improve the technique. In this paper, four different dispersions of Ca(OH)2 nanoparticles were characterised by Small Angle X-rays Scattering technique (SAXS) and Transmission Electron Microscopy (TEM) in order to achieve information on size, shape, polydispersity, agglomeration, and crystal structure (by SAED patterns) of the particles. Once characterised, the dispersions were tested in two different case studies, the Carceri dello Steri in Palermo with their graffiti and the 18th century lunettes at the SS. Giuda e Simone Cloister, Corniola (Empoli) with their lime-based mural paintings. The treated samples were characterised in relationship to either their morphology and surface chemical composition by Scanning Electron Microscopy coupled with Energy Dispersive X-rays spectroscopy (SEM-EDX), or their water absorption and mechanical properties (resistance to material abrasion). The results obtained showed that all the dispersions were nanometrically structured and their application succeeded in recovering the mechanical properties of the painting or graffito layers, not altering their permeability to water and keeping perfectly the wall transpiration. However, the dispersions constituted of the nanoparticles obtained via a synthesis able to control size and shape of the Ca(OH)2 particles resulted in a better performance in situ, even if the differences found by SAXS and TEM were slight. 相似文献
10.