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Search Results: 1 - 10 of 90662 matches for " 周彤 "
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基于Hankel范数模型降价的控制对象的名义模型选择

自动化学报 , 1997,
Abstract: ?研究了控制对象具有多个模型时,求取其适合鲁棒控制器设计的名义模型的问题.提出了一种基于Hankel范数模型降阶的名义模型选择算法.仿真结果确认了算法的有效性.
比值导数光谱法同时测定饮料中糖精钠和苯甲酸

中国公共卫生 , 2002, DOI: 10.11847/zgggws2002-18-06-63
Abstract: ?比值导数光谱法是在多波长线性回归的基础上发展起来的一种新的多组分光谱分析方法〔1,2〕,该法利用二元混合物的混合光谱与其中某一组分的光谱比值对波长求导,可分辨重叠光谱.本文研究了糖精钠和苯甲酸的导数光谱,并用比值导数光谱法进行处理,提出了同时测定二组分的导数光谱—比值导数分光光度法,该法无需分离,分辨能力强,能有效地消除干扰,提高灵敏度,对合成样品及饮料中糖精钠和苯甲酸的测定均获满意结果.报告如下.
中国天然气消费结构的模糊地域聚类
The Fuzzy Regional Clusters of China’s Natural Gas Consumption Structure
 [PDF]

仲兵, 尹海
Advances in Energy and Power Engineering (AEPE) , 2016, DOI: 10.12677/AEPE.2016.45021
Abstract:
出于提高天然气政策效率、优化天然气消费预测以及改善天然气管网规划等目的,运用基于模糊等价关系闭包的聚类方法对大陆30个省份(不含西藏) 2013年天然气消费结构进行了聚类研究。结果为,这些省份:1) 在0.9的精度水平上,共有22类,其中河北与黑龙江组成1类,山西与湖北组成1类,江西、广东、贵州、云南与陕西组成1类,其余省份各独为1类;2) 在0.8的精度水平上,共有12类,其中北京、天津、内蒙古、上海、福建、河南、海南、重庆、青海及新疆各独为1类,江苏与山东组成一类,其余省份组成1类;3) 在0.7的精度水平上,共有4类,其中重庆独为1类,北京与上海组成1类,福建、河南组成1类;4) 在0.6的精度水平上,共有2类,其中重庆独为1类,其余所有省份组成1类;5) 在0.5的精度水平上,仅有1类。据研究结果,得三个主要结论:1) 地域特征并非中国天然气消费结构差异的唯一因素;2) 重庆、北京、上海、福建以及河南在天然气消费结构方面难以与其它省份聚为1类;湖北与山西以及江西、广东、贵州、云南与陕西在这方面很大程度上又各同属一类;3) 重庆表现出了最明显的独特性。这些现象的深层原因值得进一步研究。
In order to enhance the efficiency of natural gas policy, optimize the forecast of natural gas con-sumption and improve the plan of natural gas pipeline construction, an fuzzy clustering based on the fuzzy equivalence relation’s transitive closure is applied to the natural gas consumption structures of 30 provinces (excluding Tibet) of Mainland China in 2013. The results show that, among those provinces: 1) at the accuracy level of 0.9, there are 22 clusters, with Hebei and Hei-longjiang being one cluster, Shanxi and Hubei being another, Jiangxi, Guangdong, Guizhou and Shannxi being a third and each of the rest along being a single cluster; 2) at the accuracy level of 0.8, there are 12 clusters, with Beijing, Tianjin, Inner Mongolia, Shanghai, Fujian, Henan, Hainan, Chongqing, Qinghai and Xinjiang each being a single cluster, Jiangsu and Shandong being one, and all others being another; 3) at the accuracy level of 0.7, there are 4 clusters, with Chongqing along being a single, Beijing and Shanghai being one, Fujian and Henan being another, and all others be-ing the fourth; 4) at the accuracy level of 0.6, there are 2 clusters, with Chongqing along being a single, and all others being the other; and 5) at the accuracy level of 0.5, there is only 1 cluster. Three points can be concluded from the results. First, no evidence of regional characteristic has been found associated with the structures of natural gas consumption in those provinces. Second, it turns out to be rather difficult for Chongqing, Beijing, Shanghai, Fujian as well as Henan to be classified in one cluster, while Hubei & Shanxi and Jiangxi & Guangdong & Guizhou & Yunnan & Shannxi belong to one cluster rather significantly. And third, Chongqing appears the most unique. The in depth logics of those phenomena are worth further investigation.
耗能减震技术的回顾与前瞻
,
力学与实践 , 2000, DOI: 10.6052/1000-0992-f2000-131
Abstract: 回顾和总结了国内外关于耗能减震技术研究与应用的状况,包括耗能减震的原理与特点,几种耗能减震器的性能特性和恢复力模型,耗能减震结构的性能与特点;耗能减震结构体系的分析与设计方法及标准化发展;耗能减震结构的工程应用等,提出了耗能减震技术未来发展的一些方向和有待进一步研究的若干问题.
多元线性回归在卫生检验中的应用
戈早川,
中国公共卫生 , 1995,
Abstract: ?在卫生检验中,常常遇到多种待检测的物质共存于同一样品中,无论测定其中的哪一种物质,其他共存物质均不同程度地产生干扰。为实现混合样品中各种物质的分别测定,通常的做法是预先将各种物质进行繁琐的分离,这样不仅增加了分析检验手续,而且由于分离过程中的损失和砧污难免给检验带来较大的误差。本文将多元线性回归分析应用于卫生检验中,成功地进行了同一样品中多种食用色素的同时分光光度测定,方法准确、简便、毋需进行色素预分离。
限制树宽图上的有界聚类
李曙光,
计算机科学 , 2011,
Abstract: 有界聚类问题源于ii3m研究院开发的一个分布式流处理系统,即s系统。问题的输入是一个点赋权和边赋权的无向图,并指定若干个称为终端的顶点。称顶点集合的一个子集为一个子类。子类中所有顶点的权和加上该子类边界上所有边的权和称为该子类的费用。有界聚类问题是要得到所有顶点的一个聚类,要求每个子类的费用不超过给定预算召,每个子类至多包含一个终端,并使得所有子类的总费用最小。对于限制树宽图上的有界聚类问题,给出了拟多项式时间精确算法。利用取整的技巧对该算法进行修正,可在多项式时间之内得到(1+ε)-近似解,其中每个子类的费用不超过(1+ε)b,:是任意小的正数。如果进一步要求每个子类恰好包含一个终端,则所给算法可在多项式时间之内得到(1+ε)-近似解,其中每个子类的费用不超过(2+ε)b。
INACTIVATION AND CONFORMATIONAL CHANGES OF AMEVOACYLASE DURING DECYLTRIMETHYL AMINONIUM BROMIDE TITRATION
溴化+烷基三甲基铵滴定时氨基酰化酶的失活与构象变化的比较

海梦,
生物物理学报 , 1993,
Abstract: The inactivation and conformational changes of aminoacylase during denaturation by detergent decyltrimet yl aminonium bromide have been studied. The enzyme activity decreased with increasing of detergent concentration and was inactivated completely at a comcentration of 50mmol/L . The conformational changes of aminoacylase during denaturation at different concentrations of decyltrimethyl aminonium bromide have been determined by fluorescence emission spectra. With the increase of concentration of detergent fluorescence emission intensity decreased and reached the minimum at a detergent concentration of 220mM. Results showed that the inactivation of enzyme was prior to its conformational changes. It suggests that the active site of aminoacylase may be more flexible than the whole molecule.
Nominal Model Selection for Control Plant Based on Hankel-Norm Model Reduction
基于Hankel范数模型降价的控制对象的名义模型选择

Zhou Tong,

自动化学报 , 1997,
Abstract: This paper investigates the problem concerning with plant nominal model selection when a batch of plant models have been supplied, with the nominal model intended use as robust controller design. A selection algorithm is proposed which is based on frequency weighted Hankel norm model reduction. An illustrative example shows that compared with the plant nominal model seleted intuitively, the approximation error of the plant nominal model obtained through the proposed algorithm is smaller, even though its complexity remains unchanged.
线性分式扰动下奇异系统鲁棒滤波递推算法
张光磊,
自动化学报 , 2007,
Abstract: 研究了线性分式扰动下线性奇异系统的状态估计问题,给出了一种Kalman形式的递推滤波算法.研究表明,线性分式不确定性可以表示为一系列加性不确定性的交集.本文讨论了如何寻找保守性最弱的加性不确定性来近似该交集,并证明了该问题在鲁棒滤波过程中可以转化为凸优化问题.数值仿真验证了上述算法的有效性.对于具有结构约束的线性分式不确定性,该算法的性能优于现有算法.
Research of Geometric Model for Binocular Perception
双眼立体感知几何模型的研究

梁栋,
中国图象图形学报 , 1998,
Abstract: 利用普通针孔成象的双摄像模型对双眼立体感知几何模型进行了研究,详细讨论了体视象空间的视觉重构,最后通过实验分析了影响体视的因素。
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