back crossing 中文意思是什麼

back crossing 解釋
回交
  • back : n 1 背，背部；背脊；背面，反面；背後，後部，後面，裏面。2 （指）甲；（刀）背；（手）背；（書）背...
  • crossing : n 1 交叉，相交；橫切，橫斷；橫越，橫渡。2 交叉點；十字街口；人行橫道；（河的）渡口，（鐵路的）閘...
  1. Turning twice along podnovinsky, balaga began to pull up, and turning back, stopped the horses at the old equerrys crossing

    巴拉加沿著波德諾文斯基大街走了兩段路，開始勒住馬，往回走，在舊馬廄街十字路口，馬停步了。
  2. Introgression ( introgressive hybridization ) the introduction of genetic material from one gene pool to another by hybridization and subsequent back - crossing to one or other of the parents

    漸滲現象（漸滲雜交） ：是通過雜交或其後代與某個親本回交，遺傳物質從一個基因庫被引入另一個基因庫的現象。
  3. Abstract : the main characters and seed set of bc1 ， bc2 ， bc1f2 from ms line back - crossing with the pollen of hybrid rice were studied. the appearance of a large number of self fertile plants in ms line was analyzed. the effect of introgression of restoring genes on ms line purity and hybrid yield in indica and japonica rice was discussed. it was pointed out that “ iso - cytoplasm restorer line ” was seriously reducing the purity of ms line and that hybrid rice was unsuitable for isolation zone in the seed production fields

    文摘:研究了雜交稻花粉對母本不育系回交後代群體bc1 、 bc2 、 bc1f2的主要農藝性狀和育性表現，分析了不育系中出現大量自交結實株的原因，討論了恢復基因滲入對秈、粳不育系純度和雜交稻產量的影響，指出「同質恢」對降低不育系純度的嚴重性和雜交稻作制種田隔離區的不合理性。
  4. The park gates, at the back, opened just near the level crossing of the colliery railway ; the shipley colliery itself stood just beyond the trees

    屋后的園門是挨近礦場鐵道和大路的交叉點的，希勃萊礦場本身就在那些樹叢后邊。
  5. This design has distinctive technical features as follows : 1. applied multi - sensor construction. well - calculated distance and crossing angles between sensors aiming at a same target makes it possible to acquire more accurate back waves than single sensor construction

    採用多探頭結構，多個探頭之間相互之間有一定距離和交織發射角度，對準同一個被測物體的反射面，可使檢測范圍內的每一個固定點上反射面的可測方位個數較單探頭有所增加，可大大降低回波漏檢率； 2
  6. One fair - haired young soldierprince andrey knew himof the third company, with a strap round the calf of his leg, stepped back, crossing himself, to get a good run, and plunge into the water. another swarthy and very towzle - headed sergeant up to his waist in the water, bending his fine, muscular figure, was snorting with enjoyment, as he poured the water over his head with his blackened hands

    一個年輕的金發士兵安德烈公爵認識他是三連的，小腿肚上系一條皮帶，畫著十字往後退幾步，以便更好地跑動，然後跳進水裡去，另一個黑黑的，頭發總是亂蓬蓬的軍士，站在腰深的水裡，肌肉發達的身子顫抖著高興地噴著響鼻，用兩只粗黑的手捧水淋自己的腦袋。
  7. Second, as currently study of hot point, back ? emf, it will discuss the principle of the sub - position examination in detail. based on the principle, it put forward a kind of improving back - emf method of crossing - zero checking turns position. but this did n ' t resolve to the root problem that the speed scope is very narrow and it need an in expiation of speed error and so on. thus it put forward a new improvement method at next chapter

    其次，就目前所研究的熱點? ?反電勢法，詳細討論了其轉子位置檢測的原理，在此基礎上提出了一種改進的反電勢過零點檢測方法，其可直接從電機端部得出反電勢對地的電壓值，而不是通過電機中心點電壓來得到反電勢。
  8. Scene spot located in the crossing of west labor road and baisha road, nearby helong stadium. look down west to the xiangjiang river, far off yuelushan, and back to baisha park

    坐落於天心區勞動西路與白沙路交匯處，樓體高34層毗鄰賀體育場西俯湘江遠眺嶽麓山背依白沙公園。
  9. The chip jk3ce that is one of micro - controllers in motorola 68hc08 family is used as control unit in this system. the zero crossing point of the back emf can be obtained by comparing the terminal voltage with the virtual neutral point, then using the software of the system can figure out the commutation period. the electronic commutation replaces the mechanical commutation in this way

    本系統採用的控制晶元為motorola系列單片機中的jk3ce ，反電勢過零點可以通過比較電機端電壓和虛擬中點電壓來得到，將過零點信號送往單片機捕捉埠後由系統軟體來確定換相時刻，這樣就可以由電子換向裝置替代機械換相裝置，有利於提高系統運行的可靠性，並降低了系統維護的費用。
  10. This topic discusses the back - emf zero - crossing detection, the method of phase judging and compensation in detail. in order to improve the speeding performance we adopt the digital closed - loop speed control strategy

    詳細介紹了反電動勢過零檢測、相位判斷及相位補償的原理及實現方法，並且為了在較寬范圍內提高bldcm的調速性能，採用了數字式轉速閉環控制。
  11. Associated with a practical example of pipeline crossing with directional drilling technique in yizheng - changling crude oil pipeline, this paper analyzes the characteristics of crossing through rocky stratum with directional drilling, deliberates the stratum status, drilling machine selection, drilling tool assembly, direction control, mud control ; drilling process as well as emergency dealing scenarios at the stages of guiding - hole drilling, aperture expanding and back - towing

    摘要結合儀征長嶺原油管道洪湖長江定向鉆穿越工程實例，分析了管道定向鉆穿越長距離巖石層的特點，論述了定向鉆穿越巖石層的地層狀況、鉆具組合、控向措施、泥漿控制、鉆進工藝以及導向孔鉆進、擴孔、回拖階段的應急預案，針對在鉆導向孔過程中因泥漿壓力高、信號線多次出現被高壓泥漿沖壞、造成控向信號不穩定甚至中斷的情況，對信號線的安裝提出了改進措施。
  12. Proceedings cover back cover front cover inside cover color inside crossing color b w

    會刊封面封底封二封三彩頁跨彩頁黑白頁
  13. Martin knew of the enormous gulf between him and this man - the gulf the books had made ; but he found no difficulty in crossing back over that gulf

    馬丁知道他跟自己之間有一道很大的鴻溝那是讀書造成的。他要是願意跨回去倒也容易。
  14. Back then the international health regulations mainly involved the reporting of outbreaks of disease. they also established some controls to stop infected people from crossing borders and spreading disease

    之後，國際健康章程主要加入了戰爭爆發而帶來的疾病。他們也制定了一些控制手段去控制傳染病的擴展。
  15. Passing the stone tablet engraved with the characters of " beautiful rivers and mountains ", which is to the right of yiran pavilion, one reaches the ancient mercy light temple after crossing the serene bamboo grove and the dragon turning back bridge

    經過位於怡然亭右邊的那塊刻著「壯麗河山」幾個字的石碑，穿過平靜的竹林，越過翻身橋，我們就來到了歷史悠久的慈光寺。
  16. In our way of driving to be that go back to the hotel to have lunch, we have seen a scene in pyongyang - the burning sun is left, the main crossing of the urban district, the woman traffic police who wears the sky blue police uniform is commanding the traffic without any confusion

    在我們驅車回酒店吃午飯的途中，我們看到了平壤最精彩的一景-烈日下，市區的主要路口，身穿天藍色警服的女交警正有條不紊地指揮交通。
  17. In our way of driving to be that go back to the hotel to have lunch, we have seen a scene in pyongyang - - - the burning sun is left, the main crossing of the urban district, the woman traffic police who wears the sky blue police uniform is commanding the traffic without any confusion

    在我們驅車回酒店吃午飯的途中，我們看到了平壤最精彩的一景- -烈日下，市區的主要路口，身穿天藍色警服的女交警正有條不紊地指揮交通。
  18. He was talk - radio fodder for weeks after coming back from park city, utah, with his right arm in a sling and a similarly flimsy excuse in tow ( he said he slipped on a patch of ice while crossing the street )

    從尤他的鹽湖城回來之後的好幾個星期他都是各個廣播電臺報道的素材，因為他的右手受傷了，還因為他那脆弱的理由（他說他過馬路時踩到一塊冰塊滑倒了） 。
  19. In the system, control unit accomplishes back - emf zero - crossing information reading and closed loop commutation. the system eliminates the pwm interferences and the commutating interferences by filtering with software algorithm. in order to make the bldc commutate exactly, the method of three - point estimation is used for phase locking in the system. the system also accomplishes several important objects, such as tmppt of photovoltaic arrays, unmanned supervision of the system, fault detection etc. the results of the experiment show that the device, which is made on the base of the principle above, can control the motor to complete the exact commutation

    系統以motorola單片機jl3為核心，完成了系統外圍硬體電路和控制軟體設計，實現了直流無刷電機反電勢過零檢測，利用軟體濾波的方式消除了pwm波干擾及換相干擾；採用三點預估演算法，進行相位鎖定，以完成直流無刷電機準確換相；同時實現了光伏陣列工作點的tmppt跟蹤、系統無人監控和故障檢測等功能。
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