全文获取类型
收费全文 | 130篇 |
免费 | 4篇 |
专业分类
教育 | 44篇 |
科学研究 | 37篇 |
各国文化 | 1篇 |
体育 | 19篇 |
文化理论 | 16篇 |
信息传播 | 17篇 |
出版年
2023年 | 1篇 |
2022年 | 2篇 |
2021年 | 5篇 |
2020年 | 3篇 |
2019年 | 13篇 |
2018年 | 9篇 |
2017年 | 9篇 |
2016年 | 9篇 |
2015年 | 6篇 |
2014年 | 5篇 |
2013年 | 17篇 |
2012年 | 8篇 |
2011年 | 10篇 |
2010年 | 4篇 |
2009年 | 6篇 |
2008年 | 5篇 |
2007年 | 2篇 |
2006年 | 2篇 |
2004年 | 1篇 |
2003年 | 3篇 |
2002年 | 2篇 |
1999年 | 2篇 |
1998年 | 1篇 |
1996年 | 1篇 |
1994年 | 1篇 |
1991年 | 1篇 |
1990年 | 1篇 |
1988年 | 1篇 |
1982年 | 2篇 |
1981年 | 1篇 |
1980年 | 1篇 |
排序方式: 共有134条查询结果,搜索用时 0 毫秒
11.
Paolo Castelnovo Massimo Florio Stefano Forte Lucio Rossi Emanuela Sirtori 《Research Policy》2018,47(9):1853-1867
The Large Hadron Collider at CERN, the European Organisation for Nuclear Research, is the world’s highest-energy particle accelerator. Its construction (1995–2008) required frontier technologies and close collaboration between CERN scientists and contracting firms. The literature on “Big Science” projects suggests that this collaboration generated economic spillovers, particularly through technological learning. CERN granted us access to its procurement database, including suppliers of LHC from 35 countries for orders over 10,000 Swiss Francs. We gathered balance-sheet data for more than 350 of these companies from 1991 to 2014, which include the years before and after that of the first order received. The study assesses, in quantitative terms, whether becoming a CERN supplier induced greater R&D effort and innovative capacity, thus enhancing productivity and profitability. The findings – which controlled for firms’ observable characteristics, macroeconomic conditions, and unobserved time, country, industry and firm-level fixed effects – indicate a statistically significant correlation between procurement events and company R&D, knowledge creation and economic performance. The correlation is chiefly driven by high-tech orders; for companies receiving non-high-tech orders, it is weaker, or even statistically not significant. 相似文献
12.
Over the last years, there was an increasing interest in keeping suitable microclimatic conditions for the preservation of artefacts: the artefacts preservation requirements may diverge from those of the museums visitors, willing to enjoy the works of art in a situation of psycho-physical wellness. The HVAC designers and engineers will have then to cooperate closely with the curator, in order to define a compromise between conflicting environmental performance requirements. In particular at the stage of air-conditioning system design or retrofit, it is extremely important to carry out a series of preliminary analysis to evaluate and monitor the existing environmental conditions and to anticipatory simulate and predict the post-intervention conditions. To this aim, advanced fluid-dynamic investigation tools (Computational Fluid Dynamic [CFD] techniques) enable to deal with the specificity of such topics and provide a useful decision-making support. 相似文献
13.
This paper proves a general structural property of the wavelet tree for a given seminorm in the context of the wavelet packet transform method. This structural property can be used in denoising algorithms of different applications to guarantee the optimality of novel search strategies. The property holds for any input signals using any orthogonal analysing wavelet families. The property holds for any norms, which results to be a convex function through the wavelet tree. Using a defined norms, seminorms or pseudonorms, this property can be used to detect incoherent parts of an input signal by using the minimal depth of the tree. In this sense the proposed denoising procedure works without thresholds for the localisation of different kinds of noise, as well as for a stop criterium for an optimal representation of the incoherency. The proof of this property is performed by mathematical induction and the demonstration is based on orthonormality with the help of the multiresolution framework aspects of the wavelets packet tree. The Theorem is independent of the definition of the adopted norm and of the incoherent part of an input signal. In this sense, the discovered property is a general one, which is related to any norm and any nature of the signal incoherence. It can be used in different applications, in which a minimum of a norm is required to be calculated through the wavelet tree. 相似文献
14.
This study presents the results of an experiment which investigated analogical reasoning in knowledge acquisition in a natural school setting. The aims were to evaluate the efficiency of analogy in the conceptual restructuring of a science topic and compare the effects of analogy in different learning conditions. Two analogical topics of physics (water flow and heat flow) were studied by means of two experiments performed in the classroom with concrete objects. Eighty-four 5th graders, divided into three experimental conditions (given analogy, constructed analogy, no analogy), took part in the study. The quantitative analysis mainly confirms the hypothesis that analogy can be a productive way to trigger a process of knowledge restructuring while students learn a new topic. However, the effective use of the analogy was affected by the experimental condition: When the analogy was constructed by the learners themselves, instead of being presented and justified by the teacher, it acted indeed as a more powerful tool in understanding the new topic which required changing their initial conceptions. The qualitative analysis shows the children’s explanations of the heat flow phenomenon and different conceptual outcomes of the learning process. Finally, educational implications are considered. 相似文献
15.
Hypercomputation and the Physical Church-Turing Thesis 总被引:1,自引:0,他引:1
16.
Mattia Cattaneo Hugo Horta Paolo Malighetti Michele Meoli Stefano Paleari 《Higher Education》2017,74(5):775-798
This study analyses the university choices of male and female students in Italy over the 2003–2012 period and for two sub-periods before (2003–2008) and after (2009–2012) the 2008 financial crisis. The analysis is guided by human capital, signalling and preference theories and implemented through a competing destinations model that controls for the socio-economic features of both the region of origin and destination. The findings show that in the post-crisis period, males became more career-oriented in their university choices due to increasingly constrained and competitive labour markets. The constrained post-crisis labour markets led females to focus more on the educational experience than on future employability prospects. Our results suggest that the financial crisis maintained or even widened gendered social roles as they relate to university choices; specifically, males assumed an even greater career-centred family role, whereas females adopted more adaptive lifestyles that potentially place them at a disadvantage in the labour market and in society in years to come. 相似文献
17.
Fabio Lucidi Arnaldo Zelli Luca Mallia Caterina Grano Paolo M. Russo Cristiano Violani 《Journal of sports sciences》2013,31(5):447-456
Abstract In this study, we assessed the longitudinal effects of social-cognitive mechanisms on the self-reported use of doping substances and supplements among Italian high school students. In total, 1232 students completed questionnaires measuring various psychological factors hypothesized to influence students' intention to use substances. Three months later, 762 of the students completed the same questionnaires a second time and also reported their use of substances during the time between assessments. Overall, the percentages of students using doping substances (2.1%) or supplements (14.4%) were consistent with values reported in the literature. Analysis of the data showed that adolescents' intention to use doping substances increased with stronger attitudes about doping, stronger beliefs that significant others would approve of their use, a stronger conviction that doping use can be justified, and a lowered capacity to resist situational pressure or personal desires. In turn, stronger intentions and moral disengagement contributed to a greater use of doping substances during the previous 3 months. Doping use was also correlated significantly to supplementation. In conclusion, our results provide novel information about some of the psychological processes possibly regulating adolescents' use of doping substances and supplements. The results also highlight possible areas for future study and intervention, focusing on the prevention of adolescents' substance use. 相似文献
18.
Paolo M. Cunha Crisieli M. Tomeleri Matheus A. do Nascimento João Pedro Nunes Melissa Antunes Hellen C. G. Nabuco 《Journal of sports sciences》2013,31(24):2843-2848
ABSTRACTThe main purpose of this study was to compare the effects of resistance training (RT) performed with different training volumes on phase angle (PhA), body water components, and muscle quality (MQ) in untrained older adult women. A second purpose was to assess the relationship between PhA and MQ. Sixty-two older adult women (68.6 ± 5.0 years, 65.2 ± 13.3 kg, 156.1 ± 6.2 cm) were randomly assigned into one of the three groups: two training groups performed either 1 set (G1S) or 3 sets (G3S), or a control group (CG). Body water components and PhA were estimated by bioelectrical impedance (BIA). MQ was determined by dividing skeletal muscle mass estimated by dual-energy absorptiometry (DXA) by total muscle strength from three exercises. After the intervention period, both training groups demonstrated improvements (P < 0.05) when compared with CON for intracellular water, total body water, PhA, and MQ. These results suggest that RT can improve PhA, body water components, and MQ after 12 weeks of RT in untrained older women, regardless of training volume. Furthermore, changes in MQ were positively correlated with changes in PhA (r = 0.60, P < 0.01). 相似文献
19.
Maria Antonietta Pinto Paolo Iliceto Sergio Melogno 《European Journal of Psychology of Education - EJPE》2012,27(1):35-58
The article presents a study on metalinguistic, cognitive and metacognitive abilities in university students. A sample of
353 students was recruited; 178 of which from scientific and 175 from humanistic Faculties, with gender balance (M = 178;
F = 175) whose age range was between 20 and 25 years old. They were administered a metalinguistic ability test that assesses
metalinguistic awareness at implicit and explicit levels (L and ML scores) and the Raven’s Standard Progressive Matrices 38
(SPM38). In addition to the usual nonverbal administration of the matrices, candidates were asked to justify in written form
the reasons for the solution indicated in each item. Three scores were considered for the SPM38: the ordinary score based
on the number of correct nonverbal solutions (O.S.), a 7-point scale for assessing the argumentation of the correct solutions
(C.ARG.S.) and a 6-point scale for assessing the argumentation of the incorrect solutions (I.ARG.S.). Significant gender and
curriculum effects were found, with males and scientific students dominating at the nonverbal level while females and humanistic
students dominated in the argumentative abilities related to the matrices and in all the scores of the metalinguistic test.
A number of significant correlations were found between all the metalinguistic, cognitive and metacognitive abilities considered,
with a prominent role of the metalinguistic abilities at the explicit level (ML score) that show a clear argumentative structure
very similar to the C.ARG.S. argumentations in the matrices test. 相似文献
20.
Giovanna F. Miranda Francesca Gualtieri Paolo Coccia 《Medical reference services quarterly》2013,32(2):132-145
The new Web generations are influencing the minds and changing the habits of software developers and end users. Users, librarians, and information services professionals can interact more efficiently, creating additional information and content and generating knowledge. This new scenario is also changing the behavior of information providers and users in health sciences libraries. This article reviews the new Web environments and tools that give librarians opportunities to tailor their services better, and gives some examples of the advantages and disadvantages for them and their users. Librarians need to adapt to the new mindset of users, linking new technologies, information, and people. 相似文献