在项目后期,因为信息更多,估算精度为确定估算。估算的精确程度从低到高有:初步preliminary 、概念conceptual 、可行性feasibility 、量级order of magnitude 、确定definitive。在启动阶段,项目估算为粗略量级估算(Rough Order of Magnitude Estimate), ROM估算的范围是实际结果的-25-+75%。 估算成本的依据:计划活动工作...
These are the oldest of all the records I have found, by an order of magnitude. When they were originally penned, the species that would go on to become the Ecumene had not even emerged from primordial ooze. Though my findings are not conclusive, I believe that these documents were created...
The amount of time that it takes to achieve the finished product—and how much work and investment is required—is inevitably forgotten when you get to see for a moment the sheer magnitude of what’s possible. 商务对接...
time linear programming algorithms of khachian and karmarkar and the techniques used to solve combinatorial and integer programming problems, an order of magnitude larger than was possible just a few years ago. overall a comprehensive yet lively and up-to-date discussion of the state-of-the-art ...
Therefore, the biosynthetic reactions of the competitive substrates succinate and succinyl CoA in E. coli would be blocked. Additionally, the bioconversion efficiency of module 1 was significantly lower than that of module 2 by about one order of magnitude (6.4 mg/L DHB produced in the module...
and when I made calculations I saw that it was impossible to get anything of that order of magnitude unless you took a system in which the greater part of the mass of the atom was concentrated in a minute nucleus. It was then that I had the idea of an atom with a minute massive cen...
在“Beat Frequency” 栏输入“2.4G”,“Number of harmonics” 栏输入“3”(谐波数目确保Beat frequency与number of harmonics之积大于要测的频率),“Accuracy Defaults”项选择“moderate”,“Sweep”处选择扫描“prf", 对其初始值和结束值进行设定,分别为“-50” 和“0”,步长为“2”,(PAC Magnitude (dBm)...
Correct scientific notation requires that the first term range in value so that it is greater than one but less than 10, and the second term represents the power of 10 or order of magnitude by which we multiply the first term. 把第一项数值按照科学计数法改写后,应该比1大但是比10小,而用来...
You can see that it would take a complicated set of equations to get the complete and exact formula. It is so complicated that we postpone this problem until next year. 莴苣斋评注:此处埋下一个伏笔。 Instead we shall work out a very simple case in order to understand all the physical ...
Two tasks demonstrate the leverage it provides: the diagnosis of analog circuits and the estimation of the acidity of chemical solutions.关键词: Practical, Theoretical or Mathematical/ artificial intelligence/ artificial intelligence acidity estimation order of magnitude reasoning incomplete quantitative ...