電容變化比 的英文怎麼說
中文拼音 [diànróngbiànhuàbǐ]
電容變化比
英文
ratio of varying capacitance-
The device has more advantage than traditional adjustable ac high voltage design. it adopts adjustable method to make adjustable series resonance even easier and the change extend of tested much wider. it is fit to test the majority of electricity system design
該裝置與傳統的調感式交流高電壓裝置相比具有更多優點，採用調頻方法使調節諧振更容易，被試品的變化范圍可以更大，適合大多數電力系統裝置的試驗。Eev should be selected for various refrigeration systems according to the thermal properties of refrigerants ; the discharge coefficient of eev is sensitive to the aperture and impulse quantity of eev ; when the eev structure is made, the discharge coefficient goes up with the lowering of evaporation temperature or goes down with the hoisting of the condensation temperature. it is le
對于不同工質的冷藏集裝箱製冷系統，電子膨脹閥應該根據具體製冷劑的熱力性質選取；電子膨脹閥流量系數對孔徑和脈沖數比較敏感；在結構固定時，流量系數隨蒸發溫度的降低而升高，隨冷凝溫度的增加而增大，受過冷度變化的影響較小；電子膨脹閥的容量受孔徑影響最大。Linear induction motor is an important kind of machines which have some merits such as simple structure, low cost, durability, convenience for maintenance etc. the subject of this thesis is to study a big circular ring linear induction motor, and the major works in this thesis are summarized as follows : ( 1 ) considering the effects of the finite length of primary core, one - dimension analytical solution for the air gap field is cited in this paper. based on it, the single layer winding magnetic field is studied. considering whole - pitched and short - pitched winding configuration with odd poles and half - fulled slots in both ends, the double - layer winding magnetic field is analyzed, respectively
本文對大圓環直線感應電機進行了深入細致研究，內容包括： （ 1 ）本文採用有限長行波面電流作用於有限長鐵芯上的模型，引用了氣隙磁場一維解，研究了單層繞組磁場，奇數極半填槽雙層繞組在採用整距和短距時磁場的分析、比較，簡單介紹了二維解； （ 2 ）用有限元軟體ansoft對大圓環直線感應電機空載氣隙磁場進行了靜態分析，並分析了結果； （ 3 ）用軟體進行了額定電壓下的瞬態分析，得到了轉矩，位移，轉速隨時間變化曲線圖，利用單極性霍爾元件測定轉速並與軟體計算結果進行了比較，採用等效電路法計算了堵轉時的最大電磁力並做實驗進行了驗證，由實驗測得了三相電流波形，並與計算結果進行了比較，對其不對稱性進行了定性分析。The problem about neutral - point - grounding mode is an all - around technical problem which associated with not only power system reliability ， insulation coordination ， electromagnetic interference ， but assault safety 。 in china ， the neutral grounding modes of the 10kv net involved of none grounding, grounding by arc suppressing coils, resistance grounding or reactance grounding in the past 。 with the development of civic power network ， low resistance grounding mode was used to restrain the over voltage, particularly in guangzhou, shanghai ， beijing ， and zhuhai etc. it was reported that the over - voltage level of low resistance grounding mode is lower than that of arc suppressing coil mode, but the operation carried out the other way 。 at substations in guangzhou and shanghai it was found that the low resistance grounding mode is successful 。 but in some areas ， such as zhuhai ， substations grounding with low resistance revealed some problems ， including power supply reliability rapidly dropping ， transmitting line often tripping ； and person safety being threatened 。 so interiorly the grounding mode selection of the 10kv network was disputed, which mainly focused on the fault form of 10kv net grounding, the apply area of suppressing arcing coil grounding mode, power supply reliability level of the two modes, person safety, communication interfere and the workload of maintenance
爭議點主要是在10kv電網接地故障的形式、消弧線圈接地的應用范圍、兩種運行方式供電可靠性的高低、人身安全、通訊干擾和運行維護工作量等諸多方面。 11 17本論文就是針對以電纜為主的城區10kv電網中性點接地方式的選擇問題進行研究。論文首先對10kv電網的中性點運行各種方式進行分析，比較各方式的特點，然後以重慶儲奇門變電站10kv電網的實際參數來建立數值計算模型，在考慮了電網接地電容電流變化、中性點電阻取值大小、接地點接地電阻值變化等多種影響因素的情況下，對中性點經消弧線圈接地和經小電阻接地方式下電網的過電壓水平和接地點短路電流大小進行了數值計算，其計算結果與電科院所作現場試驗進行了比較。In order to make the sensitivity of 2 - demension accelerometer along the two main arbors almost identical, symmetric four - beam structure that embeds a double - sides interdigitated differential capacitive with puckered beam in two directions was used as sensitive component. in addition, the differential capacitive accelerometer fabricated by bulky silicon micromechanical technique has high sensitivity, wide measurement scope, less nonlinear error, and simple converting circuit. then, the structure parameters of the sensitive component were calculated and stimulated, which results in a set of the optimized structure design parameters, main fabrication procedure and several key fabrication technology
為使二維振動傳感器在兩主軸方向的靈敏度大致相同，敏感元件採用高度對稱的四梁結構，其中每個軸向上均採用帶折疊梁的雙側叉指電容結構，採用體硅微機械工藝製作的高深寬比叉指電容式敏感元件，具有高靈敏度、寬量程、非線性誤差小、外圍電路簡單等優點;對設計的敏感元件結構參數進行了計算，並利用有限元法進行了模擬分析，根據模擬結果得出了優化參數;在確定敏感結構的基礎上，研究了敏感元件採用體硅微機械加工工藝製作的工藝流程和關鍵工藝技術;對敏感晶元內部的c - v介面電路進行了原理設計與分析，利用差動測量技術得到由振動引起的微小電容變化量，經c - v介面電路進行相位調制處理，然後通過解調輸出與加速度成正比的電壓信號。We find that a gate voltage on a gate capacitor will excite a potential distribution similar to that of a single charge soliton. we call it a static potential soliton. what " s important is that the profile of such a soliton can be changed proportionally and continuously
我們發現給一個門電容加上門電壓將會在結鏈中激發一個類似於單電荷孤子的電勢分佈，並將其稱為靜電勢孤子，只是這種孤子的輪廓可以成任意比例地連續變化。Compared with limn2o4, li2mn2o4 has lower reversible capacity, in that the net charge of lithium ion increases, accordingly interactions between lithium ion and oxygen one strengthen, leading to difficulty for lithium ion to deintercalate
Li2mn2o4與limn2o4相比，錳離子的凈電荷幾乎不變，表明錳離子與氧離子的相互作用變化不大，大部分鋰離子和氧離子的相互作用增強，鋰離子脫出較為困難，可逆容量降低。Abstract : the rechargeble batteries are used for backup power internal electrically equipments and instruments. but batteries lifetime usually is shorten by overwork and then malfunctions of equipment are induced. to avoid the complexion described above, the protection circuit against overwork is designed. it is based upon the voltage comparator and regulator. it will light up a red led when the volume of the batteries discharged close upon 50 % ; it will switch off the load automatically when it discharged closing to 80 % of their energy capacity, thus overwork of batteries can be avoided and lifetime may be extended
文摘:用蓄電池做后備電源的系統（或設備） ，常因過放電導致電池提前報廢而造成設備故障.根據電池電壓隨容量變化的規律，利用電壓比較器和電壓基準源設計製作了電池放電保護電路，當電池放電量接近容量的50 %時，啟動預警信號；當電池放電量達到容量的80 %時，電路自動切斷負載，防止電池過度放電，延長電池壽命，保證系統（或設備）在供電恢復正常后能正常運行There are distinct changes about shifts or intensity in bulk plasmon, surface plasmon, and interband electron transitions losses as a result of oxidation of specimens, and adsorption and oxidation processes can be studied through these changes. at room temperature, the formation of oxide layers on uranium and uranium - niobium alloys were found to occur rapidly upon exposure to oxygen, and the resultant oxide in each case was near - stoichiometric uo2. due to formation of niobium oxide in uranium - niobium alloys, the diffusion of o ~ ( - ) ( o ~ ( 2 - ) ) and u ~ ( 4 + ) in the interface region was prevented, and the corrosion resistance of uranium - niobium alloys to oxygen is greatly enhanced by alloying with niobium
研究結果表明：清潔表面鈮和鈾的體等離子體振蕩所造成的電子能量損失的實驗值與理論計算值較為符合；隨著氧化程度的加劇，表面等離子體（ sp ） 、體等離子體（ bp ）以及價帶電子躍遷所造成電子能量損失的譜峰發生了明顯的連續偏移或強度的變化，這些變化可以用來分析鈾及鈾鈮合金的初始氧化過程；室溫下，鈾及鈾鈮合金很容易與氧作用，最終結果，鈾僅氧化為二氧化鈾，另外，在鈾鈮合金氧化過程中，因為有鈮的氧化物存在，不利於氧和鈾在界面擴散，增強了鈾鈮合金抗氧化性能； eels能獲得樣品表面的信息比aes更為表面，更為靈敏，但由於eels的譜線過于集中，主要在幾十ev以內，也有不容易區別和解譜的不足。In this circuit, reference current sources are used to charge and discharge capacitors. this oscillator ’ s output is very ideal through control circuit under 5. 7v reference voltage, and oscillator ’ s frequency and duty - cycle could be adjusted if reference current source or capacitors in the circuit was adjusted. and the changes of temperature and voltage affect stabilize of the frequency little
此電路利用系統內部基準源產生的電流信號來對電容進行充放電，然後經過控制電路作用后，產生的輸出振蕩波形的上升時間和下降時間非常小，更接近理想矩形波形;通過調節基準源電流信號或者電容值大小，可調節振蕩波形的頻率和占空比，同時溫度和電壓的變化對振蕩器輸出波形頻率穩定度的影響很小。Compared with the similar research results, the weighted control ic here has the following characteristics : ( 1 ) the circuit structure is simpler ; ( 2 ) the chip ' s fabrication is compatible with standard cmos process ; ( 3 ) n - mosfets with high w / l ratio and short channels are used for weighting and output to reduce the insertion loss ; ( 4 ) the weighting factor varies in a relatively wide range with the controlling signals ; ( 5 ) input and output impedance approach 50 in low frequency ( e. g. 50mhz ), while in higher frequency they slightly deviate from 50, hence the energy reflection lower than 0. 1 ; ( 6 ) it completes the functions of sampling, weighting, controlling and summing of high frequency analog signals
它的加權控制電路與已報道的相關電路相比具有如下特點：電路結構簡單；製造工藝與普通cmos工藝兼容：短溝道，高寬長比的nmos晶體管具有低的通導電阻，將其作為加權、輸出器件可降低由電路引起的插入損耗；改變加權信號，可實現權值在較大范圍內的連續變化；輸入、輸出阻抗在低頻（如50mhz ）下接近50 ，而在高頻下略有偏離50 ，但反射系數均低於0 . 1 ；實現了對高頻信號的取樣、加權、控制、疊加功能的迭加。A variable reactance can be realized by duty ratio control. then the fcl can attain to the goal of controllable limiting fault current and controllable series compensation. first, the topology of pwm - fcl is proposed based on the analysis of others " s research
它是由一個以pwm原理控制的電感模塊和一個補償電容並聯后，再與一個限流電感串聯而成，改變脈沖的占空比可以得到變化的阻抗，實現限流和串聯補償。4. to have researched the dielectric constant changing rule of oil - water mixture when the ratio of oil - water changing and the design principle and mechanical design of capacitor sensor with dielectric constant changing
4 、研究了油、水混合物介電常數隨油、水體積百分比的變化規律，以及變介電常數式電容傳感器設計原理及機械設計。Being basis on the 14 regional grid planning texts of historical data of hunan province, initially determining the factors that affecting power grid construction ; to reflect the distribution of information to determine the scale of construction leading indicators to assess the scale, with its own network of intelligence presented to the region to assess the scale of the distribution network - building indicators system ; establishes assessment models of evaluating 110kv distribution network building scale integrated ; considering the main factor that influencing the construction scale of the distribution network, the improvement method of 10kv distribution networks capacity - load ratio is proposed ; the combination of high voltage distribution network planning optimization technology results presented evaluation pressure distribution network building scale integrated assessment methods
課題以湖南省14地區電網已有規劃文本歷史數據為基礎，初步確定各種影響電網建設的因素;以反映配電網建設規模的主導信息來確定規模評估指標，提出了符合自己網情的地區配電網建設規模的評估指標體系;建立了評價110kv配電網建設規模的綜合評估模型;通過研究各影響因素與負荷發展儲備系數參數的關系提出了確定10kv變電容載比的方法;結合高壓配電網規劃的優化技術成果，提出了評價中壓配電網建設規模的綜合評估方法。Mobile devices face temporary loss network connectivity when move ; they are likely to have scarce resources, such as low battery power, slow cpu speed and little memory ; they are required to react to frequent and unannounced changes in the environment, such as high variability of network bandwidth, and in the resources availability
比如當這些設備在移動時不得不面對網路的短暫性連接或是不可預知的掉線情況；這些設備的資源通常是很有限的，電池容量很小、 cpu速度很慢、內存很少；他們要求能適應位置、上下文條件、網路帶寬改變等環境的變化，同時做出適當的反應。Then it reviews the research results of the distribution management globally and analyses the questions and research state of the distribution management information system, the distribution planning investment project, the distribution network reconfiguration, the same trade comparing of the distribution. however, due to the wide - range, fuzziness and risk character of the distribution management, based on fuzzy set and genetic algorithm theory, the major contents and research results are as follows : 1. the multi - object group decision integration model research and application based on fuzzy set theory
本文介紹了我國配電管理所面臨的電力企業改革和用電環境的變化，回顧了國內外在配電管理系統方面取得的研究成果，具體分析了配電管理信息系統，配電規劃投資方案，配電網路重構，配電同業比較存在問題和研究現狀，針對配電管理的模糊性，風險性和全局性，採用模糊集分析和遺傳演算法理論，提出了本文的研究內容。The current break arithmetic and net arithmetic use fault steady signal as defection gist which is steady and easily identified, and the two arithmetic inherits the excellence of the tradition breadth comparing and phase comparing, which overcomes the effect of the changing of the system parameters which brings the difficult for fault defection
電流突變量演算法和網路演算法以故障后穩態基波信號作為選線依據，信號穩定，容易識別，並且這兩種演算法吸取了傳統比幅比相演算法的優點，有效的克服了系統參數變化等影響帶來的選線困難。To the exploration, the author studies sailimu and buerjin wind - electricity field. the study shows the short circuit proportion supplied by wind - electricity is very high, so the wind - generator can " t be treated as a simple equipment that assumes energy, nor a simultaneous generator, if as an unsimultaneous generator, the short circuit will be different when the capacity changes, as a sequence, the relay will be influence too
以上研究結果表明：風力發電機提供的短路電流在短路電流中占相當大的比例，因此不能將風力發電機作為簡單負荷處理，也不能視為同步機處理，即使作為異步機處理，當採用容量不同時，短路電流大小也有變化，因此，也就直接影響繼電保護的整定計算。Vco ’ s theory and parameters especially for the basic mechanism of phase noise are studied. the parasitic effects of rf - ic passive devices such as inductors and varactors and the design guidelines for the on - chip spiral inductors are included too. the accumulation - mode varactor, which has a higher quality factor value than the inversion - mode mos varactor, is studied in detail
研究電感和變容管這兩種射頻集成無源器件的寄生效應和射頻mos晶體管的熱噪聲模型，提出集成電感的設計原則和優化方法，詳細研究了一種新型的積累型mos可變電容，這種積累型mos變容管比一般的反型mos變容管有更高的品質因數。This paper analyses, compares and researches the measurement of solar array deeply. the system takes advantage of a new measurement of solar array that samples the signal of voltage and current continually during charging capacitor by solar array to redraw the i - v characteristic of solar array. this method can test the i - v characteristic of solar array conveniently and quickly in contrast with the traditional method
針對太陽電池陣列的測試方法，本文進行了詳細的分析比較和探討，系統採用一種新型的電容動態充電方式對太陽電池陣列進行特性測試，該方法是通過檢測太陽電池陣列對電容的充電過程中電流、電壓的變化數據，重現光伏陣列的i - v特性，採用這種方式可以快速而方便的測量太陽電池陣列的i - v特性，具有體積小、重量輕等特點，克服了傳統現場測試方法的弊端。分享友人