物权法若干概念释疑——《物权法》研究之二     

余贵林 《内江师范学院学报》2010,25(7):44-48

《物权法》中的＂物＂应当作目的性扩张,包括有体物和法律上可以支配的自然力。＂善意＂则应区分情形具体分析。在登记对抗的情形,应解释为不知道也不应当知道;在不动产善意取得,善意为不知道;在动产善意取得,善意为不知道且无重大过失;在善意占有,善意为不知道。  相似文献   

Recursive parameter estimation algorithm for multivariate output-error systems     

Yanjiao Wang  Feng Ding  Minhu Wu 《Journal of The Franklin Institute》2018,355(12):5163-5181

In this paper, we consider the parameter estimation issues of a class of multivariate output-error systems. A decomposition based recursive least squares identification method is proposed using the hierarchical identification principle and the auxiliary model idea, and its convergence is analyzed through the stochastic process theory. Compared with the existing results on parameter estimation of multivariate output-error systems, a distinct feature for the proposed algorithm is that such a system is decomposed into several sub-systems with smaller dimensions so that parameters to be identified can be estimated interactively. The analysis shows that the estimation errors converge to zero in mean square under certain conditions. Finally, in order to show the effectiveness of the proposed approach, some numerical simulations are provided.  相似文献   

H_∞ output-feedback control for discrete-time switched linear systems via asynchronous switching     

Zhiyong Jiang  Peng Yan 《Journal of The Franklin Institute》2018,355(14):6215-6238

In this paper, we consider the H_∞ hybrid dynamical output-feedback control problem for discrete-time switched linear systems under asynchronous switching. A time-varying multiple Lyapunov-like-function (MLF) approach is applied to derive sufficient conditions that guarantee the stability and weighted l₂-gain performance of the closed-loop systems, where the established conditions explicitly depend on the upper and lower bounds of asynchronous switching delays. An alternative approach is proposed to decouple the bilinear problems of the control synthesis conditions. Convex optimization algorithms are also proposed based on the established conditions to determine the minimum l₂-gain performance. Two numerical examples are provided to illustrate the effectiveness of the proposed method, demonstrating significant improvement over the existing results.  相似文献   

Chaos control of the permanent magnet synchronous motor with time-varying delay by using adaptive sliding mode control based on DSC     

Shaohua Luo  Ruizhen Gao 《Journal of The Franklin Institute》2018,355(10):4147-4163

This paper focuses on the problem of chaos control for the permanent magnet synchronous motor with chaotic oscillation, unknown dynamics and time-varying delay by using adaptive sliding mode control based on dynamic surface control. To reveal the mechanism of motor system and facilitate controller design, the dynamic behavior of the system is investigated. Nonlinear items of system model, upper bounds of time delays and their derivatives are taken as unknown in the overall process. A RBF neural network with an adaptive law, which eliminates restrictions on accurate model and parameters, is employed to cope with unknown dynamics. In order to solve issues such as chaotic oscillation, ‘explosion of complexity’ of backstepping, and chattering associated with sliding mode control, a sliding mode controller is developed within the framework of dynamic surface control by the hybrid of adaptive technology and RBF neural network. In addition, an appropriate Lyapunov function is employed to demonstrate the system stability. Finally, the feasibility of the proposed scheme is testified by simulation.  相似文献   

Adaptive synchronization of multi-agent systems via variable impulsive control     

Tiedong Ma  Tiantian Yu  Bing Cui 《Journal of The Franklin Institute》2018,355(15):7490-7508

This paper mainly focuses on the adaptive synchronization problem of multi-agent systems via distributed impulsive control method. Different from the existing investigations of impulsive synchronization with fixed time impulsive inputs, the proposed distributed variable impulsive protocol allows that the impulsive inputs are chosen within a time period (namely impulsive time window) which can be described by the distances of the left (right) endpoints or the centers between two adjacent impulsive time windows. Obviously, this kind of flexible control scheme is more effective in practical systems (especially for the complex environment with physical restrictions). Moreover, the proposed adaptive control technique is helpful to solve the problem with uncertain system parameters. By means of Lyapunov stability theory, impulsive differential equations and adaptive control technique, three sufficient impulsive consensus conditions are given to realize the synchronization of a class of multi-agent nonlinear systems. Finally, two numerical simulations are provided to illustrate the validity of the theoretical analysis.  相似文献   

The wider impacts of high-technology employment: Evidence from U.S. cities     

Tom Kemeny  Taner Osman 《Research Policy》2018,47(9):1729-1740

Innovative, high-technology industries are commonly described as drivers of regional development. ‘Tech’ workers earn high wages, but they are also said to generate knock-on effects throughout the local economies that host them, spurring growth in jobs and wages in nontradable activities. At the same time, in iconic high-tech agglomerations like the San Francisco Bay Area, the home of Silicon Valley, the success of the tech industry creates tensions, in part as living costs rise beyond the reach of many non-tech workers. Across a large sample of U.S. cities, this paper explores these issues systematically. Combining annual data on wages, employment and prices from the Quarterly Census of Employment and Wages, the Department of Housing and Urban Development and the Consumer Price Index, it estimates how growth in tradable tech employment affects the real, living-cost deflated wages of local workers in nontradable sectors. Results indicate that high-technology employment has significant, positive, but modest effects on the real wages of workers in nontradable sectors. These effects appear to be spread consistently across different kinds of nontradable activities. In terms of substantive wider impacts, tech appears benign, though fairly ineffectual.  相似文献   

计算机控制农业   总被引：8，自引：0，他引：8  

齐文虎石玉林 《资源科学》1998,20(2):34-38

计算机控制农业来源于“精确农业”的概念和方法。它是应用3S技术（RS、GIS、GPS）把客观、科学的精确性引进县或大尺度的农业生产过程的一套集成农业生产技术。它的技术基础是3S技术的耦合。实施计算机控制农业除了大幅度降低投入成本外,还有效地降低对环境的污染。美国于80年代初期提出“精确农业”或“计算机辅助农业”的概念和设想。它起源于对农场范围内,在空间上均匀地施用农业技术措施的条件下农作物单位面积产量的空间不均匀性的认识。据1996年的报导,应用3S技术的计算机控制农业技术在美国已经受到农场主的广泛欢迎,计算机控制农业势将成为下一世纪的一种领先的农业生产技术。计算机控制农业的关键技术包括：①空间定位的农作物产量信息采集技术;②空间定位的土壤信息实时采集技术;①农田地理信息系统实时更新技术;④空间定位的农业投入控制系统;⑤实施计算机控制农业必须开发的硬件技术。在我国及早进行计算机控制农业的基础技术储备和试验研究无疑是十分必要的。在目前中国的农业运行体制条件下,可以在开发计算机控制农业所需要的上述单项硬件技术和计算机控制农业的集成技术的同时,选择华北山前平原的一个县,或新疆建设兵团农场或黑龙江大型国营农场,实施精确农业的思想。  相似文献   

德国“现实实验室”的构建和实践经验及对中国开展创新试验的启示     

孙浩林 《科技管理研究》2021,41(1):9-14

面对监管政策与创新发展之间的矛盾,一些国家的政府开始采取各种形式的“创新试验”制度,其中“现实实验室”就是德国政府给出的解决方式。详细介绍现实实验室的定义和构建方式,并通过具体案例展示现实实验室在实践中的应用方式。最后为中国开展相关创新试验提出3点建议。  相似文献   

产业创新实验室的高创新效率模式研究：基于WSR理论的组态研究     

王慧  夏天添  张振铎 《科技管理研究》2022,(14)

本研究基于WSR理论的分析框架,以我国91家产业创新实验室为样本,通过fsQCA的组态分析范式,剖析产业创新实验室高创新效率的驱动因素组态及提升路径。结果显示：(1)单一因素无法推动产业创新实验室的高创新效率；(2)存在3种能够驱动产业创新实验室高创新效率的组态路径,分别是“物理”层面的创新生态环境型组态、“事理”层面的高组织创新驱动型组态,以及“人理”层面的高层次人才引领型组态；(3)发现了1条能够产生低创新效率的组态路径。故建议相关组织为提升产业创新实验室创新效率,需审慎思考自身资源特征优势或劣势,并结合“物理-事理-人理”三个层面的因素组合,优化调整资源配置与优势能力建设,以摆脱条件劣势局限,实现创新效率的稳步提升。  相似文献   

企业地产投资对企业技术创新的影响 ——基于政府和市场的双重动机分析     

黄大禹  谢获宝  孟祥瑜  邹梦婷 《科技管理研究》2022,(15)

当前，中国实体企业利润持续收窄，实体企业纷纷转向投资房地产。本文发现：地方政府经济考核压力以及财政需求，是驱动实体企业进行房地产投资的重要因素。此外，宽松的货币供给，银行业和资本市场的偏好，为从事地产投资的实体企业提供了充足的金融资源，进一步推动了实体企业强化房地产投资的强度。从实体企业房地产投资影响技术创新的传导机制来看，本文发现：房地产投资活动具有明显的”挤占效应“，而无法对企业的资源起到”挤入“的功效。本文基于“驱动—传导”机制，对“实体企业房地产投资—技术创新”活动进行了全面的实证检验。  相似文献