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Search Results: 1 - 10 of 243271 matches for " 刘爱超 "
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复Hilbert空间上α次殆β型螺形映射的不变性
,
河南大学学报(自然科学版) , 2012,
Abstract: 以复分析和泛函分析为工具,证明了α次殆β型螺形映射关于推广Roper-suffridge算子在复Hilbert空间与Banach空间上保持不变性.
Software Architecture Analysis Method and Application of Scenario in SAAM
软件体系结构分析及场景技术在其中的应用

孙昌,
计算机科学 , 2000,
Abstract: A scenario-based Software Architecture Analysis Method (SAAM) is introduced. In this paper,scenario is applied to analyze quality ut OO software architecture for the first time,such as coupling, cohesion and complexity. Thereby software architecture can be measured quantiatively while it was too abstract to be measured in the past. SAAM introduced by this paper is demonstrated by applying it to analyze the attribute of software architecture of SafeproC, a test tool for C software.It is proved that SAAM in this paper can effectively measure not only static quality of software architecture,but also dynamic quality of software architecture.
软件体系结构分析及场景技术在其中的应用
孙昌
计算机科学 , 2000,
Abstract:
Poincaré截面法在混沌振动识别中的应用研究
Study on the Application of Poincaré Section Algorithm to Chaotic Vibration Identification
 [PDF]

树勇, 朱石坚, 杨庆,
Applied Physics (APP) , 2011, DOI: 10.12677/app.2011.13018
Abstract:

针对混沌识别过程中,单变量时间序列相空间重构吸引子上Poincaré截面的位置难以选择以及当系统受到不可公约的准周期激励时Poincaré截面难以确定等问题,对Poincaré截面法进行了修正,即将不可约多频激励条件下满足近邻截面条件的点近似为同截面,且对穿越轨线中同点束进行归一化处理。仿真和试验结果表明,在不同激励频率以及当试验信号重构吸引子出现轨道簇时,该方法能够有效地确定Poincaré截面,观察到了包括多周期、混沌、拟周期振动在内的不同截面图,为实测非线性时间序列分析提供有益参考。
In the process of Poincaré section extraction for chaotic vibration identification, there are many problems such as selection of the Poincaré section location on the phase space attractor reconstructed from single variable time series, determination of these sections when the system under quasi-periodic excitations, should be solved effectively. The improved Poincaré section is presented in this paper. The main idea is to consider these points which are satisfied with the neighborhood condition as the same section points, and a bunch of experimental trajectories which are derived from the signals are normalized. The simulation and experiment results show that when the cluster orbits of experimental attractor occur and the system is excited with different frequencies, the improved method is applied to determine the Poincaré section correctly. The interested phenomenon including multi-periodic behavior, chaos, and quasi-periodic vibration section are observed.

基于兴趣导航的农业科技信息协同过滤推荐方法
A Collaborative Filtering Recommendation Algorithm Basing on Preference Navigation for Agricultural Science and Technology Information
 [PDF]

王文, 宋金玲, 黄立明,
Computer Science and Application (CSA) , 2015, DOI: 10.12677/CSA.2015.56030
Abstract: 由于推荐技术在农业科技信息服务领域的应用处于起步阶段,而传统推荐技术的针对性又存在不足,针对这些问题,提出了基于兴趣导航的协同过滤农业科技信息推荐技术。对于用户类型比较单一的网站,首先根据信息的浏览量选择目标用户的候选兴趣信息,然后根据其他用户对候选信息的评分确定最终的推荐信息。对于用户类型多样化的网站,首先根据目标用户的历史浏览信息及评分确定用户兴趣导航信息,然后根据导航信息确定导航用户集,再通过导航用户集的项目评分确定相似用户集,最后根据相似用户对其他信息进行评分估计并进行推荐。
Although the recommendation technology has been used in agricultural science and technology information service website, it is still obvious that the recommendation result lacks of persona-lization. In order to solve this problem, a collaborative filtering recommendation method basing on preference navigation for agricultural science and technology information is proposed. For the website with single user type, the candidate preference information are selected for the target user firstly according to the browsing quantity, then the recommendation information is determined according to the ratings of the other users. For the website with various types of users, user preference navigation information is chosen according to the browsing history and rating of the target user firstly, the navigation users are determined basing on user preference navigation information secondly, then similar users are determined through the ratings of navigation users, finally predict ratings of other items and recommend according to the similar users.
渐开线弧齿圆柱齿轮副抗偏载特性的研究
Anti-Bias Load Capacity Analysis of the Involute Arc Cylindrical Gear
 [PDF]

祖奇,, 张益汉,
Mechanical Engineering and Technology (MET) , 2015, DOI: 10.12677/MET.2015.43023
Abstract:
在齿轮副传动过程中,常因加工误差、安装误差、受力变形引起齿轮副偏载。分析了直齿圆柱齿轮副、斜齿圆柱齿轮副的偏载产生机理及齿轮修形的局限性,提出应用新型弧齿圆柱齿轮,来提高齿轮副传动承载能力与抗偏载能力。基于弧齿圆柱齿轮独特的几何特征分析了弧齿圆柱齿轮抗偏载的原理,采用有限元分析方法分别对直齿、斜齿、弧齿圆柱齿轮副进行受力分析,结果显示弧齿圆柱齿轮可以明显改善齿轮副齿面受力状态,具有明显的抗偏载特性。
The processing errors, installation errors and deformation often lead to Gears partial load during gear pair transmission process. The paper analyzes generating mechanism of partial load and limitations of gear modification about the spur gear pair as well as the Helical Gear Pair, proposing to use this new arc cylindrical gear to improve the carrying capacity and anti-bias load capacity of the auxiliary drive gear. The paper analyzed the principle of anti-bias arc cylindrical gear carrier based on the geometric characteristics of the arc cylindrical gear, using the finite element method to analyze the stress of straight teeth, Helical and arc tooth cylindrical gear pairs respectively, showed that the arc cylindrical gear pairs can significantly improve the stress state of tooth surface, with a clear anti-side load characteristics.
软件体系结构研究综述
孙昌,金茂忠?,
软件学报 , 2002,
Abstract: 近年来,软件体系结构逐渐成为软件工程领域的研究热点以及大型软件系统与软件产品线开发中的关键技术之一.归纳了软件体系结构技术发展过程及其主要研究方向.在分析了典型的软件体系结构概念之后,给出了软件体系结构的定义.通过总结软件体系结构领域的若干研究活动,提出了软件体系结构研究的两大思路,并从7个方面介绍了软件体系结构研究进展.探讨了软件体系结构研究中的不足之处,并分析其原因.作为总结,给出了软件体系结构领域最有前途的发展趋势.
氧化偶联反应的最新研究进展有机化学
张剑, 陆庆全, ,
有机化学 , 2015, DOI: 10.6023/cjoc201411028
Abstract: 近年来,过渡金属催化的氧化偶联反应已成为有机合成化学中构建碳—碳键以及各类碳—杂键的重要方法.主要综述了我们研究小组在氧化偶联领域,尤其是第三代氧化偶联反应方面所取得的研究进展,介绍了各类反应的特点、优势及在合成中的应用.
温度及机车载荷耦合作用下多年冻土区路基稳定性研究
,兰*,吴志坚,陈拓
岩石工程学报 , 2011,
Abstract: 受区域气候条件和外界环境条件的影响,青藏铁路多年冻土区典型路基结构热学稳定性(保护多年冻土效果)和工程稳定特点有其特殊性。结合多年冻土地区的气候环境条件,选取青藏铁路格尔木至拉萨段北麗河试验段典型的路基断面,对多年冻土区素土路基和块石路基结构在气候变化时的温度场以及机车荷载产生的动力场的耦合作用下的路基应力-应变场、沉降变形特征等进行了计算分析。最后对控制多年冻土地区路基变形的工程措施进行了评价。
蝉拟青霉不同来源菌株的生长特性及其对蚜虫的致病性
李忠,金道,邹晓,
植物保护学报 , 2007,
Abstract: 为了筛选到生防效果好的高效蝉拟青霉菌株,对其12个不同来源菌株的生长速率、产孢量、孢子萌发率、抗紫外线能力、耐热性以及对蚜虫的致病力等进行比较。结果表明,SL和3L菌株菌落生长最快,SL5和FY菌株产孢量最高,FY和3L菌株孢子萌发率最高,FY和FJS菌株抗紫外线能力最强,3L和3716菌株耐热性最强,LB、3L菌株和3716菌株对蚜虫的致病性高,孢子和代谢物对蚜虫的致死率都在80.00%以上。经综合比较,LB菌株在致病力、产孢量、抗紫外线、抗热性等方面表现优良。
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