value n. 1.價(jià)值;重要性;益處。 2.估價(jià),評(píng)價(jià)。 3.價(jià)格,所值;交換力。 4.(郵票的)面值。 5.等值;值得花的代價(jià)。 6.(字等的)真義,意義。 7.【數(shù)學(xué)】值;【語(yǔ)言學(xué)】音值;【生物學(xué)】(分類(lèi)上的)等級(jí);【音樂(lè)】音的長(zhǎng)短;【繪畫(huà)】明暗配合。 8.〔 pl.〕生活的理想,道德價(jià)值;社會(huì)準(zhǔn)則。 rated value 額定值。 proper value 【物理學(xué)】本征值。 commercial [economic] value 經(jīng)濟(jì)價(jià)值。 exchange(able) value (= value in exchange) 交換價(jià)值。 value in use 使用價(jià)值。 surplus value 剩余價(jià)值。 face value 票面價(jià)格。 market value市價(jià)。 pay full value for sth. 對(duì)某物付足代價(jià)。 the value of the dollar 美元的購(gòu)買(mǎi)力。 the value of a symbol 某符號(hào)的意義。 be of [no] value有[無(wú)]價(jià)值。 (for) value received 〔支票用語(yǔ)〕貸款…正。 of value有價(jià)值的 (news of value重要消息)。 out of value(繪畫(huà)等)明暗不調(diào)和。 place a value on 估價(jià),評(píng)價(jià)。 put [set] a high [much] value (up)on 高估;重視,看重。 vt. 1.給…估價(jià),定…的價(jià)。 2.對(duì)…作出評(píng)價(jià);尊重,看重(Troops are valued for quality rather than for number. 兵貴精不貴多)。 value oneself for (what one does, etc.) 夸耀(自己事業(yè)等)。 value oneself (up)on 自夸 (sth.) (value up(on) one's knowledge 夸耀自己的知識(shí))。
In this paper , the classical ann approach is improved because of the introduction of inertial coefficient . now the ann can use a bigger rate of learning . with the introduction of former k times sample values , the improved ann method can only used to detect harmonic currents 本文對(duì)傳統(tǒng)的ann法進(jìn)行了改進(jìn),通過(guò)引入慣性系數(shù)的方法,提高了人工神經(jīng)元自適應(yīng)的學(xué)習(xí)率,并采用前k次采樣值,使得ann法用于檢測(cè)畸變電流中諧波電流。
Even if the fault spread from external fault zone to internal fault zone , the differential protection can avoid misoperation . main criterion of protection is composite - percentage current differential algorithm according to every sampled value , which can accelerate the protection ' s trip , reduce large amounts of calculation and have strong stability to ta saturation 本文采用基于采樣值的比率制動(dòng)式電流差動(dòng)保護(hù)算法作為保護(hù)的主判據(jù),可以明顯提高保護(hù)動(dòng)作速度和減少計(jì)算量;具有較強(qiáng)的抗ta飽和能力,在區(qū)內(nèi)故障時(shí)無(wú)制動(dòng),區(qū)外故障時(shí)有極強(qiáng)的制動(dòng)特性。
To sum up the use of these three buttons , let ' s say that if your computer has a low computing power and if you want to use area lamps and raytracing anyway , you could find useful to set a low samples value ( like 2 . 00 ) and activate the buttons dither and / or noise in order to simulate slightly softer shadows 總結(jié)這三個(gè)按鈕的用法,我們可以得出結(jié)論:如果你的計(jì)算機(jī)主頻不高,但是你想使用區(qū)域照明和光線追蹤等特性,你最好設(shè)置一個(gè)較低的采樣值(例如2 . 00 ) ,并且激活抖動(dòng)和/或噪聲,從而簡(jiǎn)單地平滑一下陰影。
This formula used inverse regression and data fusion technical and maximum likelihood theory , then this method enabled random sample value obtained in ultrasonic and rebound method of different detection population to mix together effectively , and reach estimation of concrete strength 該公式利用逆回歸理論、數(shù)據(jù)融合技術(shù)和最大似然原理,將回彈值和聲速值分別看作被解釋變量,將來(lái)自超聲法和回彈法不同量綱的檢測(cè)數(shù)據(jù)進(jìn)行有效融合,得出混凝土強(qiáng)度的推定值,該推定結(jié)果具有無(wú)偏性和方差最小性質(zhì)。
So it is very important to investigate the inverse time characteristic of microprocessor distance protection . this paper emulates all kinds of faults of transmission lines by using emtp , and gets relative current and voltage sample values . then many distance protection thoughts and algorithms are adopted to compare each inverse time characteristic , better arithmetic and set thoughts are got 本論文應(yīng)用emtp進(jìn)行輸電線路各種故障情況的仿真,采樣取得保護(hù)相關(guān)的電壓、電流數(shù)據(jù);采用各種距離保護(hù)思想、算法,采用c語(yǔ)言進(jìn)行計(jì)算,比較各自的時(shí)限特性,得出反時(shí)限特性比較好的算法及其整定思路;對(duì)于各種故障情況,應(yīng)用相關(guān)整定思路進(jìn)行離線計(jì)算,得出各種原理的時(shí)間距離特性。
In this paper , the application of dsp technology in electric power measurement meter has been studied , meanwhile analysed the error of the electronic energy meter , put forward the measure to compensate error with software method . it not only changes the precision degree of electric power measurement meter , but also avoids the disadvantage from error compensate with hardware method , it is unnecessary to adjust the sample value of voltage and electric current in circuitry 對(duì)dsp技術(shù)在電度表中的應(yīng)用進(jìn)行了研究,對(duì)電度表系統(tǒng)的誤差進(jìn)行了分析,提出了采用軟件方法來(lái)補(bǔ)償誤差的措施,使電度表的精度達(dá)到了設(shè)計(jì)要求,又避免了利用硬件進(jìn)行誤差補(bǔ)償所帶來(lái)的弊端,不用在線路中調(diào)整電壓、電流采樣值,有利于生產(chǎn)。
The signal we named it fundamental wave ; according to the fundamental wave , coefficients of the fundamental wave can be lined in a sequence . when the unique of the dissolve of the fundamental wave can be confirmed , the sequence of the coefficients can be regarded as one of representation forms of the signal itself ; theory of dissolvable signal shows that when order of the matrix of fundamental wave sampling equals to number of fundamental waves , the sequence of the sampling values from sampling points must be matched one by one with the sequence of the coefficients of fundamental waves . the sampling composed by sequences of the sampling values must be full sampling ; the relevant deductions of the theory of dissolvable signal shows that when sampling the signal , sampling frequency must be lager than the ratio of the number of fundamental waves to the occupation time of the fundamental waves ; to band - limited signals , when the fundamental wave is a sine signal , the results from the relevant deductions of theory of dissolvable signal is coherent to the classic sampling theory 本文通過(guò)分析認(rèn)為,當(dāng)信號(hào)集中的任一信號(hào)可表示為一系列已知信號(hào)的線性代數(shù)和時(shí),信號(hào)集便構(gòu)成可分解信號(hào)集,已知信號(hào)稱(chēng)為基波信號(hào);對(duì)可分解信號(hào)而言,基波系數(shù)構(gòu)成一序列,當(dāng)對(duì)指定的基波信號(hào)集分解唯一確定時(shí),系數(shù)序列本身便是信號(hào)的一個(gè)表示;可分解信號(hào)采樣定理指出當(dāng)基波樣值矩陣的秩等于基波數(shù)時(shí),則由采樣點(diǎn)處的采樣樣構(gòu)成的樣值序列必與基波系數(shù)序列一一對(duì)應(yīng),從而由該樣值序列構(gòu)成的采樣必為完全采樣;可分解信號(hào)采樣定理中的推論指出,對(duì)信號(hào)集進(jìn)行采樣,采樣頻率必須大于其信號(hào)分解的基波數(shù)與其對(duì)應(yīng)時(shí)長(zhǎng)之比;對(duì)有限帶寬信號(hào),若基波信號(hào)為正弦信號(hào)時(shí),由可分解信號(hào)采樣定理推論給出的結(jié)論與經(jīng)典采樣定理一致。
Abstract : in this paper , the setting scheme of the current differential protection based on sampled values using fault component is investigated . the setting schemes of the resistance coefficient and the least trip differential current are discussed in detail . the probable protection setting values for the hv transmission lines are described . it testifies the feasibility for the applications of the protection to the hv transmission lines 文摘:對(duì)基于故障分量的采樣值電流差動(dòng)保護(hù)制動(dòng)特性曲線的整定方法進(jìn)行了研究,詳細(xì)討論了其制動(dòng)系數(shù)和最小動(dòng)作電流的整定方法,同時(shí)對(duì)該保護(hù)在輸電線路中的應(yīng)用進(jìn)行了初步的估算,說(shuō)明了該保護(hù)的優(yōu)異性能。
Based on the comprehensive analysis of the application status and the existed problems of transmission line fault location , this dissertation presented a new algorithm for fault location based on two - terminal asynchronous data , which can make correction for the integrate error of line parameter , length of transmission line , sampling value and so on . at the same time , it can work out the two - terminal asynchronous phase angle with the corrected parameters 本論文在充分分析了國(guó)內(nèi)外故障測(cè)距的理論與技術(shù)以及存在的問(wèn)題后,針對(duì)輸電線路故障定位因線路參數(shù)變化對(duì)定位準(zhǔn)確度的影響,提出了能夠?qū)€路的參數(shù)、長(zhǎng)度和采樣值等誤差等進(jìn)行綜合誤差修正( cie )的新算法,并利用修正后的參數(shù)來(lái)求解兩端的不同步相角差。