共查询到20条相似文献,搜索用时 62 毫秒
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用一个全新的视角来观察你的后花园,你就会发现有太多的东西值得更近一步地观察。我们将为你提供拍摄完美微距的实用建议。 相似文献
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<正>微距摄影以它特有的拍摄视角赢得了广大影友的青睐。微距摄影的魅力不仅在于能把距离拉近,更在于能把平凡的物体拍出不平凡的感觉。无论是专业摄影师、摄影发烧友还是普通的爱好者,都有自己善用的微距摄影装备,从专业的微距镜头到消费级数码相机的微距功能,都各显其能,在摄影者的畅想与观察中呈现出一幅幅微观世界的画面。 相似文献
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“百微”镜头,也就是焦距为100mm(有时候也包括大约100mm焦距)的微距镜头,是微距摄影中使用频率非常高的镜头。因为这种镜头焦距较长,拍摄时可以在较远距离获得大比例的图像.为用光和构图保留了灵活的空间;同时,较长的焦距也有利于营造柔和的焦外效果。 相似文献
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A. Viswanathan 《应用聚合物科学杂志》1967,11(7):1027-1032
The parallel between fibers and metals is discussed in terms of their behavior upon heat treatment, crystallite size and orientation, and diffusion of atoms and molecules. It is pointed out that the degree of crystallinity employed to interpret the x-ray diffraction patterns of fibers is not an important physical parameter. The need for critical study of the mechanism of the growth of primary and secondary walls is stressed for a better understanding of the physical properties of fibers. Reference is made to Hosemann's theory of paracrystals which will help to resolve the “open” problems in polymer physics. 相似文献
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<正>改革开放前,胶鞋产品以满足内销为主,品种变化少,所以标准化工作相对滞后。回顾历史,改革开放前胶鞋产品标准简单地按鞋材粗分为布面、胶面两种,即1964年颁布执行的国标GB318-1964(适用于各类布面胶鞋)和GB319-1964(适用于各类胶面胶鞋(靴))。这种粗线条分类即使在当时计划经济时代也无法涵盖全部品种,往往顾此失彼,众口难 相似文献
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J. E. Heilman 《Journal of the American Oil Chemists' Society》1983,60(2):248-250
The crushing industry is in a period of overcapacity. Recovery from it will be quicker in Europe and in other countries in which government intervention improves margins. Long-term increases in protein and oil demand will balance the overcapacity with a more efficient industry resulting. Technological improvements will center on efficiency. 相似文献
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KB Smith 《Surface Coatings International Part B: Coatings Transactions》1997,80(12):573-576
Summary & Conclusions The goniphotometer/glossmeter based on the LDA detector has been developed into a portable and robust instrument with exceptionally
high resolution of the light distribution near the specular angle.
The LDA detector combined with the read-out circuitry and associated software made it possible to select the appropriate sets
of photodiode sensors to calculate indices of peak specular reflectance; gloss; haze and distinctness of image. The data,
including full reflected light distribution curves, can be stored and subsequently downloaded to a computer for display or
analysis. 相似文献