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Lathes are machine tools designed primarily to do turning, facing and boring, Very little turning is done on other types of machine tools, and none can do it with equal facility. Because lathes also can do drilling and reaming, their versatility permits several operations to be done with a single..
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The sound wave is the object mechanical vibrations condition (or energy) dissemination form. The so-called vibration is refers to material the particle the reciprocating motion which carries on nearby its position of equilibrium. For example, drum surface after rap, it on high and low vibrates, t..
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摘要：本文本著為促進(jìn)工業(yè)的發(fā)展的初衷探討了中國軟件公園的競爭優(yōu)勢。產(chǎn)業(yè)集群深植于當(dāng)?shù)氐闹贫认到y(tǒng)，因此擁有特殊的競爭優(yōu)勢。根據(jù)波特的“鉆石”模型、SWOT模型的測試結(jié)果對中國大連軟件園的案例進(jìn)行了定性的分析。產(chǎn)業(yè)集群是包括一系列在指定地理上集聚的公司，它扎根于當(dāng)?shù)卣�、行業(yè)和學(xué)術(shù)的當(dāng)?shù)刂贫认到y(tǒng)，以此獲..
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摘 要：本文探討了美國大型非金融企業(yè)從1964年至2008年股票價格風(fēng)險的決定小性因素。我們通過相關(guān)結(jié)構(gòu)以及簡化模型，研究諸如債務(wù)總額，債務(wù)期限，現(xiàn)金持有量，及股利政策等公司財務(wù)特征，我們發(fā)現(xiàn)，股票價格風(fēng)險主要通過經(jīng)營和資產(chǎn)特點(diǎn)，如企業(yè)年齡，規(guī)模，有形資產(chǎn)，經(jīng)營性現(xiàn)金流及其波動的水平來體現(xiàn)。與此相反，隱..
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Abstract : Based on reviewing the historical background, prospecting for the development trend ,analyzing the complicacy and mechanism and summing up some achievements and experiences in scientific research , several new problems and the possible direction of development in material processing..
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I will always remember my first introduction to the power of good product design. I was newly arrived at Apple, still learning the ways of business, when I was visited by a member of Apple's Industrial Design team. He showed me a foam mockup of a proposed product. "Wow," I said, "I want one! What..
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編寫 Web 應(yīng)用程序其輕松程度令人難以置信。它是如此的容易，以至于許多開發(fā)人員不用花費(fèi)多少時間來構(gòu)筑其應(yīng)用便能獲得非常好的性能。在本文中，我將給出10個編寫高性能 Web 應(yīng)用的技巧。我的評論不僅僅局限與 ASP.NET 應(yīng)用，因?yàn)樗鼈冎皇?Web 應(yīng)用的一個子集。本文也不是 Web 應(yīng)用性能調(diào)整的權(quán)威指南——這方面的內(nèi)容可..
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人的眼睛能看到的可見光按波長從長到短排列，依次為紅、橙、黃、綠、青、藍(lán)、紫。其中紅光的波長范圍為0.62～0.76μm；紫光的波長范圍為0.38～0.46μm。比紫光波長還短的光叫紫外線，比紅光波長還長的光叫紅外線。紅外線遙控就是利用波長為0.76～1.5μm之間的近紅外線來傳送控制信號的。常用的紅外遙控系統(tǒng)一般分發(fā)射和..
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1. One preface The admixture that wind force and solar cells generate electricity to constitute generates electricity the system and is called the breeze/ light to repair the system with each other, all having some common weakness because of the breeze and solar energies, such as the energy d..
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