hfl 中文意思是什麼

hfl 解釋
復式拉桿波紋補償器
  1. Flavonoid - 3 ', 5 ' - hydroxylase ( f3 ', 5 ' h ) corresponding to the genetic loci hfl and hf2, a member of the cytochrome p450 family, is the key enzyme in the anthocyanin biosynthesis, which is generally required for blue or purple flowers

    本研究以紫藍色矮牽牛基因組dna為模板，利用pcr技術獲得了兩個擴增產物，分別將其克隆至pgem - teasyvector上，進行了全序列分析。
  2. From the view point of the whole topologies of current mode hfl inverters, two topologies of half - bridge and push - pull current mode hfl inverters are proposed, which are composed of four power switches. hfl inverters in discontinuous current mode ( dcm ) are extended to those in continuous current mode ( ccm )

    從完善電路拓撲和降低成本的角度出發，本文提出了兩種結構的電流源高頻鏈逆變電路，它們分別是由四個功率管組成的半橋和推挽雙向電流源高頻鏈單級逆變電路，並將工作在電感電流斷續模式的逆變電路擴展到電感電流連續模式。
  3. The experiment result shows that conversion efficiency in ccm is improved by 2 percent compared with that in dcm, although the on - resistance of winding in ccm is more than that in dcm. the analysis of open - loop transfer function in both dcm and ccm shows that pull - push hfl inverter at ccm

    微分補償網路的推挽高頻鏈逆變電路在輸出從空載變化到額定阻性負載變化的過程中，逆變電路工作模式從dcm變化到ccm模式，實驗結果表明電路在這兩種模式下都能輸出穩定的正弦電壓，且具有較高的穩態精度。
  4. To isolate hfl -, hf2 gene encoding flavonoid - 3 ', 5 ' - hydroxylase ( f3 ', 5 ' h ) from petunia hybrida of the purple flower, we used a polymerase chain reaction ( pcr ) amplification using the genomic dna as a template. the result indicated that the hfl dna was 2797bp in total length and encoded 506 amino - acid, containing three extron and two intron ; hf2 dna was 2223bp in total length and encoded 509 amino - acid, containing three extron and two intron. comparison of the sequence with genbank databases revealed that hfl dna and hf2 dna shared significant nucleotides identity ( 98. 97 % and 99. 04 % respectively ) and amino - acid identity ( 99. 41 % and 99. 41 % respectively )

    Hf1dna全長2797bp ，包括3個外顯子， 2個內含子，其中一個開放閱讀框架（ orf ）編碼506個氨基酸，與文獻報道的序列相比較，具有98 . 97核苷酸同源性與99 . 41氨基酸同源性： hf2dna全長2223bp ，包括3個外顯子， 2個內含子，其中一個開放閱讀框架（ orf ）編碼509個氨基酸，與文獻報道的核苷酸同源率為99 . 04以及氨基酸同源率為99 . 41 。
  5. Hfl inverters in discontinuous current mode ( dcm ) are extended to those in continuous current mode ( ccm ), which is very important for improving the conversion efficiency. the reason is that the peak current and rms current of power switches can be reduced sharply

    本文將工作于dcm方式的單級高頻鏈逆變電路擴寬到ccm工作方式，模擬和試驗結果表明ccm模式下流過功率管電流峰值和有效值明顯減小，這對提高逆變電路的效率具有重要意義。
  6. - the home research lnstitute, hfl

    家政研究協會， hfi
  7. The home research lnstitute, hfl

    家政研究協會， hfi
  8. The achievement of transgenetic plants would provide a scientific basis and lay firm foundation for the transformation of hfl and hf2 gene into other ornamental flowers

    轉基因植株的獲得，將為以後hf1 、 hf2基因轉化其它名貴花卉作物提供科學依據，並打下良好的基礎。
  9. Push - pull current mode hfl inverter also is composed of four power switches. the simulation and experiment of a 500va experimental prototype indicates that this circuit has the advantages of less components, simple topology, the ability of four quadrant operation and high efficiency. the inverter does not need the symmetry of the components " parameters and can be applied to dc to ac conversion with single low input voltage source

    推挽雙向電流源高頻鏈逆變電路也是由四個功率管組成， 500va的原理樣機的模擬和實驗研究結果表明，該電路元器件少、電路拓撲簡單、能夠四象限可靠運行、變換效率高，並不要求器件參數的完全對稱，適合於輸入電壓較低的場合。
  10. The half - bridge bi - directional current mode hfl inverter can realize dc to ac conversion in only one stage. the half - bridge bi - directional current mode hfl inverter succeeds to the advantages of full - bridge hfl inverter but uses fewer power switches, which reduces the costs of switches " driver circuit

    半橋雙向電流源高頻鏈逆變電路只需一級功率變換即可實現直流到交流的轉換，在繼承全橋高頻鏈逆變電路優點的同時，使用的功率管更少，功率管的減小同時降低了驅動電路的成本。
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