30 mhz measurement of quartz crystal unit parameters by zero phase technique in a pi - network - part 4 : method for the measurement of the load resonance frequency fl , load resonance resistance rl and the calculation of other derived values of quartz crystal units , up to 30 mhz 用型网络的零相位法测量石英晶体元件参数.第4部分:石英晶体单元负荷谐振频率fl负荷谐振电阻rl的测量方法及其他石英晶体元件导出值的计算方法
Measurement of quartz crystal unit parameters by zero phase technique in a - network ; part 3 : basic method for the measurement of two - terminal parameters of quartz crystal units up to 200 mhz by phase technique in a w - network with compensation of the parallel capacitance c 在型网络中用零相位技术测量石英晶体单元参数.第3部分:在具有并联电容c补偿的w型网络中用相位技术测量频率200mhz及以下石英晶体单元的二端参数的基本方法
Digital instructional resource system is made up of multimedia material database , multimedia courseware database , educational video database , independence learning web - course database , tuition web - course database , teachers ' teaching websites and excellent web - course database 数字化教学资源系统可包括多媒体素材库、多媒体课件库、教育视频资源库、自主学习型网络课程库、讲授型网络课程库、教师个人教学网站群、精品课程库等。
Measurement of quartz crystal unit parameters by zero phase technique in a pi - network - part 3 : basic method for the measurement of two - terminal parameters of quartz crystal units up to 200 mhz by phase technique in a pi - network with compensation of the parallel capacitance c0 用型网络的零相位技术测量石英晶体器件参数.第3部分:用并联电容co补偿的网络零相位技术测量最高可达200 mhz的石英晶体器件谐振器两端参数的基本方法
The generation is coinciding with the probability distribution for the same work procedure . for one turn of simulation , the rigid network plan algorithm is used . after enough turns of simulation , the distribution of the total work period can be determined , at the same time the critical path and time parameters can be found in the pnp 本文首先论述了网络计划发展的几个方面,然后引入概率理论与统计知识,建立起一个概率型网络计划模型,在此基础上阐述了工序工期与网络总工期的概率分布的判定与拟合方法,通过中心极限定理同时辅助于计算机数值仿真法,对网络计划做出了一些统计分析,同时提出了概率型网络的关键路线的确定方法。
As this kind of chiller is a complex system with multi - input and multi - out put , conventional identification methods can ? commendably resolve the highly non - linear modeling of direct - fired absorption chillers using water - lithium bromide as refrigerant . with self - learning and self - organizing ability , the neural network method has transferred the research focus from interior characters , and complicated thermodynamics equations of the chillers to the direct input / output of the system , simplifying the related problems greatly . therefore , a high quality identification system model using forward feedback network bp algorithm is obtained by combining the actual experimental data and those provided by the manufacturers 本文提出的神经网络方法具有自学习、自组织的能力,使研究的焦点从关注模型的内部特征、复杂的热动力方程转移到直接考虑系统的输入输出表现上,不需系统机理方面的细节知识,不需进行具体的函数求解,使问题得到了极大的简化,因此,本文结合实际的实验数据和厂家提供的性能数据,利用前馈型网络bp算法辨识出一个性能很好的系统模型。
At first , theories about system identification are systematically reviewed , including its contents and process . at the same time , the classical system identification methods are summarized , the advantage and disadvantage of these methods are analyzed . secondly , the history of nn is briefly reviewed , and the structure , function and algorithms of feedforward nn and the recurrent nn are particularly introduced 本文首先介绍了系统辨识的内容,步骤和分类,对传统的系统辨识方法作了总结,比较了几种方法的优缺点;并回顾了神经网络的发展历程,详细介绍了前馈型网络与递归网络的结构、功能和算法以及在实际应用中设计神经网络需考虑的问题。
Some famous browse network information search tools , such as yahoo , excite , galaxy and most comprehensive search tools actually draw lessons from the idea of organizing and revealing information by traditional information retrieval language consciously or unconsciously . for example , askjeeves is a kind of nature language search engines 著名的浏览型网络信息检索工具如yahoo 、 eblast 、 galaxy和大部分综合型搜索引擎实际上都是自觉或不自觉地借鉴了传统情报检索语言组织和揭示信息的思想, altavista集成的askjeeves就是自然语言搜索引擎。
This paper discusses life - wastage of creep - fatigue for headers of superheater and reheater and algorithm of this two kinds wastage . based on these theories , b - p neural network with self - organized function has been introduced detailedly to calculate the fatigue wastage . at the same time , the paper introduces the calculation method of stress 本文主要介绍了过热器和再热器联箱的疲劳和蠕变寿命损耗的问题以及这两种寿命损耗的计算方法,并在此基础上采用前馈型网络( b - p )来计算高温低周疲劳的寿命损耗(疲劳和蠕变交互作用) 。