產(chǎn)品詳情
LED芯片技術發(fā)展的關鍵在于基底材料和外延生長技術?;撞牧嫌蓚鹘y(tǒng)的藍寶石材料、硅和碳化硅,發(fā)展到氧化鋅、氮化鎵等新材料。在短短數(shù)年內(nèi),借助于包括芯片結構、表面粗化處理和多量子阱結構設計在內(nèi)的一系列技術改進,LED在光效方面實現(xiàn)了巨大突破。硅基底成本很低,技術在不斷進步中,但目前發(fā)光效率還不滿意,如果保持這種發(fā)展速度,一旦達到較高水平,則硅基底成為主要的技術方案成為必然的選擇,企業(yè)也將獲得巨大的經(jīng)濟回報。
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一般來說,鎖點越多,門窗的抗風壓性能就越強。同時,也要考慮鎖點的配置方式,只有合理選擇門窗中鎖點的數(shù)量和布局的情況下,才會使多點鎖起到有效曠作用。在確保門窗性能的前提下,優(yōu)化鎖點布局,降低五金使用成本,才是的組合。關于鎖點數(shù)量的計算比較復雜,在此推薦一個鎖點數(shù)的簡化計算公式:設n一鎖點數(shù);W一扇寬;H一扇高;Wk一標準風壓;安全系數(shù)一2.5倍,則n=WH2.5Wk/.8(個)計算示例:某地一建筑物,經(jīng)計算Wk為2.2KN/m2,求高1.2高、寬.6米的窗需要鎖點數(shù)量:N=1.2.62.52.2/.85(個)在確定鎖點數(shù)量后,需要根據(jù)門窗型材截面(詞條截面由行業(yè)大百科提供)形狀來選擇適配的五金類別。
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下面就這幾種方式進行分析和比較:閥門節(jié)流改變離心泵流量簡單的方法就是調(diào)節(jié)泵出口閥門的開度,而水泵轉速保持不變(一般為額定轉速),其實質(zhì)是改變管路特性曲線的位置來改變泵的工況點。如圖1所示,水泵特性曲線Q-H與管路特性曲線Q-h的交點A為閥門全開時水泵的極限工況點。關小閥門時,管道局部阻力增加,水泵工況點向左移至B點,相應流量減少。閥門全關時,相當于阻力無限大,流量為零,此時管路特性曲線與縱坐標重合。