value n. 1.价值;重要性;益处。 2.估价,评价。 3.价格,所值;交换力。 4.(邮票的)面值。 5.等值;值得花的代价。 6.(字等的)真义,意义。 7.【数学】值;【语言学】音值;【生物学】(分类上的)等级;【音乐】音的长短;【绘画】明暗配合。 8.〔 pl.〕生活的理想,道德价值;社会准则。 rated value 额定值。 proper value 【物理学】本征值。 commercial [economic] value 经济价值。 exchange(able) value (= value in exchange) 交换价值。 value in use 使用价值。 surplus value 剩余价值。 face value 票面价格。 market value市价。 pay full value for sth. 对某物付足代价。 the value of the dollar 美元的购买力。 the value of a symbol 某符号的意义。 be of [no] value有[无]价值。 (for) value received 〔支票用语〕贷款…正。 of value有价值的 (news of value重要消息)。 out of value(绘画等)明暗不调和。 place a value on 估价,评价。 put [set] a high [much] value (up)on 高估;重视,看重。 vt. 1.给…估价,定…的价。 2.对…作出评价;尊重,看重(Troops are valued for quality rather than for number. 兵贵精不贵多)。 value oneself for (what one does, etc.) 夸耀(自己事业等)。 value oneself (up)on 自夸 (sth.) (value up(on) one's knowledge 夸耀自己的知识)。
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 本文对传统的ann法进行了改进,通过引入惯性系数的方法,提高了人工神经元自适应的学习率,并采用前k次采样值,使得ann法用于检测畸变电流中谐波电流。
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 本文采用基于采样值的比率制动式电流差动保护算法作为保护的主判据,可以明显提高保护动作速度和减少计算量;具有较强的抗ta饱和能力,在区内故障时无制动,区外故障时有极强的制动特性。
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 总结这三个按钮的用法,我们可以得出结论:如果你的计算机主频不高,但是你想使用区域照明和光线追踪等特性,你最好设置一个较低的采样值(例如2 . 00 ) ,并且激活抖动和/或噪声,从而简单地平滑一下阴影。
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 该公式利用逆回归理论、数据融合技术和最大似然原理,将回弹值和声速值分别看作被解释变量,将来自超声法和回弹法不同量纲的检测数据进行有效融合,得出混凝土强度的推定值,该推定结果具有无偏性和方差最小性质。
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 本论文应用emtp进行输电线路各种故障情况的仿真,采样取得保护相关的电压、电流数据;采用各种距离保护思想、算法,采用c语言进行计算,比较各自的时限特性,得出反时限特性比较好的算法及其整定思路;对于各种故障情况,应用相关整定思路进行离线计算,得出各种原理的时间距离特性。
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 对dsp技术在电度表中的应用进行了研究,对电度表系统的误差进行了分析,提出了采用软件方法来补偿误差的措施,使电度表的精度达到了设计要求,又避免了利用硬件进行误差补偿所带来的弊端,不用在线路中调整电压、电流采样值,有利于生产。
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 本文通过分析认为,当信号集中的任一信号可表示为一系列已知信号的线性代数和时,信号集便构成可分解信号集,已知信号称为基波信号;对可分解信号而言,基波系数构成一序列,当对指定的基波信号集分解唯一确定时,系数序列本身便是信号的一个表示;可分解信号采样定理指出当基波样值矩阵的秩等于基波数时,则由采样点处的采样样构成的样值序列必与基波系数序列一一对应,从而由该样值序列构成的采样必为完全采样;可分解信号采样定理中的推论指出,对信号集进行采样,采样频率必须大于其信号分解的基波数与其对应时长之比;对有限带宽信号,若基波信号为正弦信号时,由可分解信号采样定理推论给出的结论与经典采样定理一致。
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:对基于故障分量的采样值电流差动保护制动特性曲线的整定方法进行了研究,详细讨论了其制动系数和最小动作电流的整定方法,同时对该保护在输电线路中的应用进行了初步的估算,说明了该保护的优异性能。
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 本论文在充分分析了国内外故障测距的理论与技术以及存在的问题后,针对输电线路故障定位因线路参数变化对定位准确度的影响,提出了能够对线路的参数、长度和采样值等误差等进行综合误差修正( cie )的新算法,并利用修正后的参数来求解两端的不同步相角差。