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So far, the details of science of sand casting processes have been discussed. But sand casting is not suitable nor economical in many applications where the special casting process would be more appropriate. In the following pages the details of some of the commonly used special casting methods ..
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摘 要:一種用于測量電梯導(dǎo)軌質(zhì)量參數(shù)的系統(tǒng)已經(jīng)開發(fā)出來。該系統(tǒng)可以測量的質(zhì)量參數(shù)包括軌道的直線度,平面度,垂直度,寬度和高度。該系統(tǒng)由六部分組成:主導(dǎo)軌,輔助導(dǎo)軌,參考導(dǎo)軌,底座,套管和標(biāo)準(zhǔn)導(dǎo)軌。待測導(dǎo)軌安裝在底座上。表面的直線度誤差由安裝在底座上的五個線性位移傳感器來檢查。導(dǎo)軌高度及其表面直線度..
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n the past 150 years, the United States has become increasingly dependent on fossil fuel combustion for transportation, power generation, and industrial processes. But combustion of fossil fuels has an environmental price, including air and water pollution and greenhouse gas emissions. Today, the..
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摘要本文介紹了一種數(shù)字車牌識別技術(shù),該技術(shù)采用RULES-3的歸納學(xué)習(xí)算法和模板匹配技術(shù)。用于識別的車牌中的數(shù)字或字母都保存為20個2 的掩碼中。論文采用RULES-3套規(guī)則來檢測并識別每個車牌中包含的學(xué)習(xí)算法和模板匹配技術(shù)。用于識別的車牌中的數(shù)字或字母都保存為20個的掩碼中。論文采用RULES-3套規(guī)則來檢測并識別每個車..
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Summary: Control structure of rifts is a relatively simple and common problems, but it is a door and the mechanics and regong, waiting for material to the professional knowledge is very close relations of comprehensive and complex subject and are building in order to ensure the quality of the imp..
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混凝土橋梁建設(shè)-----外文翻
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The automobile engines can be classified according to :1.number of cylinders ;2.arrangement of cylinders ;3.arrangement of valves ;4.type of cooling ;5.number of cycles (two or four );6.type of fuel burned ;7.type of ignition .The engine is the source of power that makes the wheels go around and..
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模具工藝的發(fā)展必須不斷滿足人們對產(chǎn)品高質(zhì)量生產(chǎn)(包括操作性能,外觀美等)和低成本的追求.當(dāng)人們可以有效的控制注塑過程,成型材料轉(zhuǎn)換技術(shù)又能滿足零件的設(shè)計要求,以及模具可重復(fù)利用且精度和表面質(zhì)量保持穩(wěn)定時,這種愿望便可實現(xiàn)了.因此模具需要保證較高的制造精度.人們希望模具盡管在注塑過程中承受巨大的壓力仍然能夠..
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1.緒論當(dāng)今的工業(yè)的競爭已經(jīng)是真正意義上的國際市場競爭。 高效的運輸網(wǎng)絡(luò)建立了一個我們每天都要參與的 “世界市場”。 對于任何工業(yè)化國家要參與這個市場競爭,就必須采用一種適時的方式為其客戶提供經(jīng)濟、優(yōu)質(zhì)的產(chǎn)品。將產(chǎn)品設(shè)計和過程設(shè)計進行集成的重要性,在產(chǎn)品系統(tǒng)被怎么強調(diào)都不為過。但是, 即使一種設(shè)計最終..