alternating-current field 中文意思是什麼

alternating-current field 解釋
交變場
  • current : adj. 1. 通用的，流行的。2. 現在的，現時的，當時的。3. 流暢的；草寫的。n. 1. 水流；氣流；電流。2. 思潮，潮流；趨勢，傾向。3. 進行，過程。
  • field : n 菲爾德〈姓氏〉。n 1 原野，曠野；（海、空、冰雪等的）茫茫一片。2 田地，牧場；割草場；〈pl 〉〈集...
  1. Influenced by the alternating current field, all of the eutectic microstructure of al - 20si - 5fe - ti alloy changed into very small particles which is well - distributed on the base of a - al. electromagnetic stirring stimulates the forming of equiaxed crystal in al - 20si - 5fe - mn alloy. primary iron - phase is transformed from thick needle into smooth block

    電磁攪拌促進al - 20si - 5fe - xmn合金中等軸晶的生成，初生富鐵相由原來粗厚的片狀物轉化成比較圓整的塊狀，共晶組織中鐵相主要以較短的針片狀存在。
  2. The sensor used unbalanced principle of alternating electric field around feed cable to detect the state of electric field of cable core over the ground, thereby got out the result that the feed state of cable in mine had no relation to the current in the cable

    該傳感器利用饋電電纜周圍交替電場的不平衡原理檢測電纜芯線對地的電場狀態，從而間接檢測出礦井電纜的饋電狀態與電纜是否有電流無關。
  3. This paper starts the research of the liquid floated pendulous accelerometer testing system according to the engineering. at first, this paper gives the brief introduction of the history and present status of accelerometer and its testing technology, the working principium and math model of the liquid floated pendu - lous accelerometer, and then, decides the binary width pulse force retrim loop as the design proposal of testing system, researches the transfer function of every part in the system emphasizly, analyses the stability of the whole accelerometer testing system from the angle of control theoretics by the open loop transfer function of system, and designed the correcting net, analyses the basal problems such as resolution, sampling restraint, precision and so on, designs the hardware testing circuits such as preamplification, band - pass filter, alternating amplifier, phase sensitive demodulatorn, pulse - width modulation, frequency scale circuit, moment current generator. finally, using the graphics program language labv - iew which is designed for testing field especially by ni accomplishes the solfware design of testing system, realized the testing functions

    首先對加速度計及其測試技術的發展歷史和現狀，液浮擺式加速度計的工作原理和數學模型等作了簡要的介紹，然後確定了以二元調寬脈沖再平衡測試迴路為設計方案，並從控制理論的角度進行了分析，著重研究了系統中各部分的傳遞函數，利用系統開環傳遞函數分析了系統的穩定性，同時設計了系統的校正網路;分析了二元調寬脈沖再平衡測試迴路的解析度、采樣約束以及測試精度等基本問題，並按照系統分析的結果設計了包括前置放大、帶通濾波、交流放大、相敏解調、脈寬調制、頻標電路以及力矩電流發生器等測試系統各部分硬體電路，驗證了電路的正確性，最後按照測試系統的要求，採用了美國ni公司專為測試領域所開發的虛擬儀器工具? ? labview作為測試軟體開發工具，利用該圖形化編程語言完成了測試系統軟體部分的設計，實現了測試功能。
  4. The alternating current in the alternating current magnetic field leakage testing ( ac - mfl ) is one of the magnetizing manners. the sensitivity is very high to the defect of surface and the near to the surface of the workpiece. it is one of the developing directions of nondestructive testing ( ndt ) domain

    交變漏磁檢測技術中的交變是漏磁檢測技術中的一種磁化方式，該技術對工件表面及近表面缺陷具有較高的檢測靈敏度，是無損檢測領域未來主要發展方向之一。
  5. Based on that penetration depth of eddy current is theoretically different for different operationalfrequency, the flaw depth quantitive measurement method based on the characteristicalfrequency was expounded. to find the best testing model and position, it analysed and discussedthe factors which effected measurement. the mathematic relationship between the specialfrequencyand flaw depth was established to realize the accureate measurement of flaw depth. it primarily researched the technology of alternating current magnetic field leakage testing ( ac - mfl ) in our country

    在利用頻率掃描技術的基礎上，提出了基於拐點頻率的渦流檢測缺陷深度測量方法，對影響測量的多種因素進行了分析和實驗研究，得到了最佳的測試位置和測試方法，建立了拐點頻率和缺陷深度的定量關系，為深度的測量提供了新的途徑。
  6. Induced current electrical impedance tomography ( iceit ) is a new branch of electrical impedance tomography ( hit ). it applies several excitation coils on the boundary of the object. when one of the coils is stimulated by constant alternating current, the magnetic field is established

    感應電流電阻抗斷層成像（ inducedcurrentelectricalimpedancetomography ， iceit ）是電阻抗斷層成像技術的一個分支，它在被測目標的外圍放置若干個激勵線圈，對其施加時變電流，在空間產生交變磁場，從而在被測目標內激勵出感應電流。
  7. That the alloying element mn and ti substitutes the atom of fe in the rich iron - phase ( al, si, fe ) and resumes the part of the element si in primary phase refines the second phase. at the same time, the volume percentage of second phase is increased. at the course of solidification, the alternating current field changes obviously the microstructure morphology of the al - 20si - 5fe - x alloy and the number of particle eutectic structure is increased

    合金元素mn 、 ti通過占據富鐵相（ al ， si ， fe ）中鐵原子的晶格位置，同時消耗部分初生相中的si元素，形成四元富鐵相（ al ， si ， fe ， mn ） ，細化了合金中的第二相，同時提高第二相體積百分數。
  8. If injecting an invariable alternating current into patient ' s brain, it will erect the electric field in the brain and cause the distribution of voltage on the brain ' s surface

    如果對病人大腦注入一個小的恆定的交變電流，就會在大腦內部形成一個電場，並且會在大腦表面引起電位分佈。
  9. It uses the encouragement of step wave or other impulse current field source to produce the transition process field in earth. in the moment of shutting the power it produce the volute alternating electromagnetic field. from the abnormity of measuring the attenuation character of the second induction electromagnetic field, which produced by underground medium with time change, the conductive capacity and the position of the underground non - homogeneous substance can be analyzed

    瞬變電磁法（ transientelectromagneticmethod ）是一種時間域的電磁勘探方法，利用階躍波或其它脈沖電流場源激勵，在大地產生過渡過程場，斷電瞬間在大地中形成渦旋交變電磁場，測量這種由地下介質產生的二次感應電磁場隨時間變化的衰減特性，從測量得到的異常分析出地下不均勻體的導電性能和位置，從而達到解決地質問題的目的。
  10. Numerical simulation on alternating current field measurement and sensitivity analysis of detected signal

    交流電磁場檢測數值模擬及其信號敏感性分析
  11. Core losses are caused by an alternating magnetic field in the core material, thie losses are a function of the operating frequency and the total magnetic flux swing, the total core losses are made up of three main components, hysteresis eddy current and residuallosses, these losses vary considerably from one magnetic material to a - nother, applications such as higher power and hither frequency switching regulators and rf designs require careful core selection to yield the highestinductor perfor - mance by keeping the core losses to a minimum

    鐵損是由於在鐵芯中的變更磁場院所造成，這個損失與操作頻率及總流動的磁通量有關，總鐵損由三個成份組成，磁滯損，過流損及殘留損，這些損失因磁性材料不同而異，在如高功率切換調整器和rf的設計需要小心選擇鐵芯種類以降低鐵損使電感的表現最佳。
  12. Influenced by the alternating current field, except that a little of eutectic iron - phase still is the acicular structure, the most of eutectic iron - phase of the al - 20si - 5fe - mn alloy is refined into tiny particles which is segregated

    Al - 20si - 5fe - xti合金通過交流電場作用，共晶組織全部呈細小的顆粒狀均勻分佈於- al基體上。
  13. The rectifier scheme that direct current supplying with power electronic equipment is obtained by alternating current being rectified is widely applied in power electronics field. however, the rectifying circuits result in input current distortion, input power factor greatly decrease

    從電網獲取交流電經整流后為設備提供直流電是電力電子技術中應用極為廣泛的一種整流方案，然而由這種整流方案設計的電路使輸入電流產生嚴重的畸變，其諧波電流嚴重污染了電網，輸入端功率因數大大下降。
  14. Skin effect is the tendency for alternating current to flow near the sruface of the conductor in lieu of flowing in a manner as to utilize the entire cross - sectional area of the conductor. this phenomenon causes the resistance of the conductor to increase. the magnetic field associated with the current in the conductor causes eddy currents near the center of the conductor which opposes the flow of the main current near the center of the conductor. the main current flow is forced further to the surface as the frequency of the alternating current increase

    表面疚是指交流電流較傾向于導體的表面傳導而非流經整個導體截面的趨勢，這些現象會造成導體的電阻提高，與導體中的電流有關的磁場在導體中心部位產生過電流而阻礙了中心部位的主要電流，當交流電的頻率增加時，主要電流的流向會進一步被推擠到導體表面。
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