進展性點蝕 的英文怎麼說
中文拼音 [jìnzhǎnxìngdiǎnshí]
進展性點蝕
英文
progression pitting-
It has low power and can defrost or heat in the refrigerator and expositing cabinet. both the ends of the heater adopt the imported resin glue and vulcanizate for seal ment and high ni - cr stainless steel as the case. it has good corrosive resisting performance and the insulation resistance is still more than 1000 after immersing in the water and being electrified for a long time
本加熱器的特點為表面功率較小，在冰箱，展示櫃中起加熱化霜作用。電熱管兩端採用進口樹脂膠及硫化橡膠封口，外殼採用高鎳鉻不銹鋼，具有很好的耐腐蝕性能產品經長時間浸入水中通電試驗，其絕緣電阻仍1000m 。This paper mainly aims at the strategic demands for large - aperture lightweight mirror proposed by high - tech development. its main research contents are : select material blank for lightweight mirror according to physical and chemical properties of optical glass ; analyze and calculate the deformation quantity of the mirror with finite element method ; design and optimize mirror body structure of 400 lightweight plane mirror and 450 lightweight spherical mirror, analyze glass cutting principle, design specisl - use grinding wheel structure, select reasonable technological parameters to implement the processing of weight reduction holes on 400 plane mirror ; analyze etching mechanism of hydrofluoric acid, look for the technological parameters such as the optimal acid concentration and etching time etc. ; eliminate the stress of weight reduction holes and micro - cracks on 400 lightweight plane mirror ; discuss the processing principle and
本論文的研究主要是瞄準國家高技術對大口徑輕型鏡的戰略需求而開展的。主要研究內容是：根據光學玻璃的物理與化學性能，選擇輕型鏡坯材料；用有限元法對鏡子的變形進行分析、計算，找出變形規律，優化設計400mm輕型平面鏡、 450mm輕型球面鏡鏡體結構；分析玻璃切削原理，設計專用磨輪結構，選擇合理工藝技術參數，完成400mm平面鏡輕量化減重孔的加工；分析氫氟酸腐蝕光學玻璃機理，尋找最佳酸濃度、腐蝕作用時間等工藝參數，實現400mm平面鏡減重孔應力與微裂紋的消除；討論分離器加工原理和工藝技術特點，完成400mm平面輕型鏡面形加工。The paper introduces some typical water erosion disaggregation models in foreign countries, evaluates the present status of study on water erosion disaggregation model conducted in china and points out the existing problems in model study ; the necessary work should be developed and scientific issues to be solved in establishing soil erosion forecasting model in china
重點介紹了幾種國外具有代表性的分散式水蝕模型，並對國內土壤水蝕分散式模型的研究現狀進行了評價，指出了目前我國模型研究中存在的問題，以及建立我國土壤侵蝕預報模型所必須開展的研究工作和需要解決的科學問題。
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