全文获取类型
收费全文 | 111篇 |
免费 | 3篇 |
专业分类
教育 | 55篇 |
科学研究 | 47篇 |
体育 | 5篇 |
信息传播 | 7篇 |
出版年
2022年 | 2篇 |
2020年 | 3篇 |
2019年 | 4篇 |
2018年 | 15篇 |
2017年 | 8篇 |
2016年 | 7篇 |
2015年 | 7篇 |
2014年 | 9篇 |
2013年 | 8篇 |
2012年 | 6篇 |
2011年 | 5篇 |
2010年 | 4篇 |
2009年 | 2篇 |
2008年 | 3篇 |
2007年 | 4篇 |
2005年 | 6篇 |
2003年 | 2篇 |
2002年 | 1篇 |
1996年 | 1篇 |
1990年 | 2篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1983年 | 2篇 |
1982年 | 3篇 |
1981年 | 2篇 |
1973年 | 1篇 |
1963年 | 2篇 |
1961年 | 1篇 |
排序方式: 共有114条查询结果,搜索用时 15 毫秒
11.
12.
Ali Reza Zohoori 《广播与电子媒介杂志》2013,57(1):105-113
This study compared uses of U.S. television by foreign children residing in the U.S. and their American counterparts in light of theories of acculturation, cultivation, and uses and gratifications. Compared with U.S. children, foreign children: used television more for learning purposes, were relatively more interested in television programs, spent more time watching television, identified more frequently with television characters, and expressed stronger beliefs in the social reality portrayed by television. 相似文献
13.
14.
With the proliferation of computer networks and the increased use of Internet‐based applications, many forms of social interactions now take place in an on‐line context through Computer‐Mediated Communication (CMC). Many universities are now reaping the benefits of using CMC applications to collect data on student evaluations of faculty, rather than using paper‐based surveys in Face‐To‐Face (FTF) classroom settings. While the relative merits of CMC versus FTF student evaluations have been researched extensively, there is limited research published about the ways students respond to the questions from either mode of data collection. This paper reports on a research study to analyse the communication differences between student scores from FTF student evaluations and CMC evaluation questions from end of semester evaluations from a university in the Middle East region. In addition to the questions about communication mode differences between two evaluation questions, several demographic variables were measured to determine any interaction effects. The results of our study suggest that the type of communication channel mitigates the responses that students make on CMC evaluations vis‐à‐vis FTF evaluations of faculty. In particular, even though there were significant differences found at the aggregate level between CMC and FTF evaluations, when the course and instructor are controlled for, there were no significant differences reported. In addition, several differences were noted depending on the type and level of the course being studied. Also, we found that students are more likely to express more extreme responses to scale questions in CMC than FTF evaluations. Administrators should consider these potential differences when implementing on‐line evaluation systems. 相似文献
15.
Shixiang Sun Xinjiang Wei Huifeng Zhang Hamid Reza Karimi Jian Han 《Journal of The Franklin Institute》2018,355(12):4897-4915
In this paper, a composite fault tolerant control (CFTC) with disturbance observer scheme is considered for a class of stochastic systems with faults and multiple disturbances. The disturbances are divided into two parts. One represents the stochastic disturbance with partial known information which is formulated by an exogenous system. The other is independent Wiener process. A stochastic disturbance observer is designed to estimate exogenous disturbance. To make the first type of disturbance can be rejected and the fault can be diagnosed, a composite fault diagnosis observer with disturbance observer is constructed. Furthermore, a composite fault-tolerant controller is proposed to compensate disturbances and faults. Finally, simulation examples are given to demonstrate the feasibility and effectiveness of the proposed scheme. 相似文献
16.
Yueyang Li Hamid Reza Karimi Choon Ki Ahn Yuan Xu Dong Zhao 《Journal of The Franklin Institute》2018,355(7):3330-3353
This work deals with the problem of optimal residual generation for fault detection (FD) in linear discrete time-varying (LDTV) systems subject to uncertain observations. By introducing a generalized fault detection filter (FDF) with four parameter matrices as the residual generator, a novel FDF design scheme is formulated as two bi-objective optimization problems such that the sensitivity of residual to fault is enhanced and the robustness of residual to unknown input is simultaneously strengthened. A generalized operator based optimization approach is proposed to deduce solutions to the corresponding optimization problems in operator forms, where the related H∞/H∞ or FD performance index is maximized. With the aid of the addressed methods, the connections among the derived solutions are explicitly announced. The parameter matrices of the FDF are analytically derived via solving simple matrix equations recursively. It is revealed that our proposed results establish an operator-based framework of optimal residual generation for some kinds of linear discrete-time systems. Illustrative examples are given to show the applicability and effectiveness of the proposed methods. 相似文献
17.
Reza Langari 《Journal of The Franklin Institute》2018,355(10):4315-4335
Modern vehicles are equipped with a growing number of electronic devices, which significantly improve the driving experience. However, the complicated architecture of electronic systems also increases the difficulty of fault diagnosis since process models are often unavailable. This paper presents a novel detection and mitigation system for vehicle related anomalies originating in unintended acceleration (UA), which has become one of the most complained-about vehicle problems in recent history. The detection system consists of several neural network-based models, which are created by analyzing historical vehicle data at specific moments such as acceleration peaks and gear shifting. These data-driven models describe the boundary of normal vehicle behavior in the data space. A priori knowledge of complete vehicle structures is not necessary for building them. The detection system combines these models to decide if a UA event has occurred. When a UA event is detected, a mitigation system cuts the engine power and adjusts the braking force accordingly. The whole system was validated in the Simulink/dSPACE environment. UA errors were simulated so that they occurred randomly when human subjects drove virtual cars in a simulated environment. Random noise of sensors were also considered and incorporated to add realism. Various traffic scenarios were included in tests. Test results show that the integrated system is capable of detecting UA in one second with high accuracy and reducing the risk of accidents. 相似文献
18.
Gholamhossein Mehralian Hamid Reza Rasekh Peyman Akhavan Ali Rajabzadeh Ghatari 《International Journal of Information Management》2013
During the last decade, intellectual capital (IC) and intangible assets have been widely considered as critical tool to deliver successful business in an intensive-knowledge environment. Accordingly, the main goal of this paper is therefore to develop and prioritize the most important indicators of intellectual capital in knowledge-based industries. Based on an extensive literature review, a valid and reliable questionnaire was designed. In order to data gathering, it was sent out to participants from both academic and university who qualified well in pharmaceutical practice. In order to exact prioritization of indicators, fuzzy TOPSIS technique as a MADM model was used. The fuzzy TOPSIS results revealed participants remark high concerns especially about knowledge and skills of managers and employees regarding to human capital, high concerns particularly about positive climate, ratio of investment in R&D and numbers of R&D projects according to structural capital, while considering the relational capital, more attention was paid to customers and strategic cooperation such as alliances and licensing. 相似文献
19.
Ultrastructure and phylogeny of Ustilago coicis 总被引:1,自引:0,他引:1
Jing-ze Zhang Pei-gang Guan Gang Tao Mohammad Reza Ojaghian Kevin David Hyde 《Journal of Zhejiang University. Science. B》2013,14(4):336-345
Ustilago coicis causes serious smut on Coix lacryma-jobi in Dayang Town, Jinyun County, Zhejiang Province of China. In this paper, ultrastructural assessments on fungus-host interactions and teliospore development are presented, and molecular phylogenetic analyses have been done to elucidate the phylogenetic placement of the taxon. Hyphal growth within infected tissues was both intracellular and intercellular and on the surface of fungus-host interaction, and the fungal cell wall and the invaginated host plasma membrane were separated by a sheath comprising two distinct layers between the fungal cell wall and the invaginated host plasma membrane. Ornamentation development of teliospore walls was unique as they appeared to be originated from the exosporium. In addition, internal transcribed spacer (ITS) and large subunit (LSU) sequence data showed that U. coicis is closely related to Ustilago trichophora which infects grass species of the genus Echinochloa (Poaceae). 相似文献
20.
Taxonomy of e-readiness assessment measures 总被引:1,自引:0,他引:1
Payam Hanafizadeh Mohammad Reza Hanafizadeh Mohsen Khodabakhshi 《International Journal of Information Management》2009
To benefit from the advantages of information society, on the one hand, and to be afraid of being left further behind by Global Society and the increase in the digital divide, on the other hand, stimulate countries to be part of Global Information Society. These issues have led policymakers to move towards such a society by identifying the objectives, goals and targets. Planning to achieve these objectives needs a real understanding of the current situation, which is obtained by e-readiness assessment measures. There has been a proliferation of e-readiness assessment measures in recent years that each one has a certain objective. This paper elaborates on and categorizes these measures that help scholars and policymakers to (1) select the measures that fit in with their objectives, (2) prevent the repetitive research, (3) identify the defects and flaws of previous measures and correct them in their own measures, and (4) use the experiences of previous measures to construct their own ones. Based on definitions, objectives, dimensions, methods and approaches, in this paper, the measures are categorized and finally, a measure for e-readiness assessment is presented. Since this measure is a convergence of e-readiness assessment measures, the experienced modelers have consensus on it and it is more suitable to measure e-readiness of countries. Also, it can be exploited as the basis and standard for internationally comparable information society statistics. 相似文献