The Market for Picasso Prints: A Hybrid Model Approach     

Marilena?Locatelli?BieyEmail author  Roberto?Zanola 《Journal of Cultural Economics》2005,29(2):127-136

Two basic approaches have been used by the literature focusing on the return to holding artistic works: the hedonic price model and the repeat-sales model. This paper provides a procedure for jointly estimating the two models in a way that take advantages of the unique information contained in each. A semiannual price index for Picasso prints is estimated by using a model derived from the basic framework of the hybrid models. The empirical results suggest that the hybrid model provides the most precisely estimated price index by reducing the level of price volatility.JEL Classification: C5, Z1p  相似文献   

Inter-organizational knowledge integration in Collaborative NPD projects: evidence from the aerospace industry     

Angelo?Corallo  Mariangela?LazoiEmail author  Giustina?Secundo 《知识管理研究与实践》2012,10(4):354-367

This paper aims to analyse the practice of knowledge integration (KI) in Collaborative New Product Development (Co-NPD) projects involving multiple partners in an aerospace network. On the basis of a pragmatic approach, a multiple-case study is developed focusing on two Italian aerospace companies involved in a research project aimed to define methodologies and technologies for knowledge collaboration in NPD. Data are gathered with a triangulation technique merging official documents and open-ended and closed-ended interviews administered in the companies’ sites and involving managers, engineers and employees. The paper proposes a systematic treatment of the KI practice describing the types of knowledge, strategies, barriers and intellectual property policies for KI at inter-organizational level. The findings provide insights to address NPD models for aerospace networks where the complexity and value of codified knowledge coming from external sources requires adequate treatments and security standards.  相似文献   

我国联合型SKL自主创新的SWOT分析     

危怀安  刘薛  姚远 《科学学与科学技术管理》2012,(5):22-28

作为我国基础研究"国家队"的重要组成部分,联合型SKL已经成为我国开展高水平基础研究的重要基地,但其原始创新和集成创新能力有限,且不同类型的联合型SKL自主创新绩效差异显著。首次运用SWOT法对我国联合型SKL自主创新进行了比较全面系统的分析。研究表明,我国联合型SKL在自主创新方面具有各自的优势和劣势,面临不同的威胁和发展的机遇。因此,发挥多种策略的协同功能,就成为提升我国联合型SKL自主创新能力的应对之策。  相似文献   

基于主体间性的多媒体教学师生交往关系研究   总被引：1，自引：1，他引：0  

刘细良  秦婷婷  汪丹丹 《远程教育杂志》2010,28(2):24-28

如何使师生在现代多媒体教学过程中达到真正的交互、平等和共享,一直以来为理论学术界所关注,根据对恩格斯托姆活动理论模型的创新可以发现,主体间性理论较好地化解了多媒体教学过程中师生交往的诸多问题与障碍。因此,积极探索主体间性师生交往关系的路径对实现教学目的至关重要,  相似文献   

Effect of a semi electro-mechanical engine valve on performance and emissions in a single cylinder spark ignited engine     

Bülent 《浙江大学学报(A卷英文版)》2010,11(2):106-114

In this study, an electro-mechanical valve （EMV） system for the intake valve ofa fottr stroke, single cylinder, overhead valve and spark ignition （SI） engine was designed and constructed. An engine with the EMV system and a standard engine were tested to observe the effects of the EMV on engine performance and emissions at different speeds under full load. The EMV engine showed improved engine power, engine torque and break specific fuel consumption （BSFC）. A 66% decrease in CO emissions was also obtained with the EMV system, but hydrocarbons （HC） and NOx emissions increased by 12% and 13% respectively.  相似文献   

Voices of university students with disabilities: inclusive education on the tertiary level – a reality or a distant dream?     

Iva Strnadová  Vanda Hájková  Lea Květoňová 《International Journal of Inclusive Education》2013,17(10):1080-1095

Twenty-four university students with disabilities were interviewed about their experiences studying at Czech universities. The interviews were analysed using the grounded theory approach. The most commonly experienced barriers faced by these students were institutional barriers, attitudinal barriers, and disability-specific barriers. The types of support mentioned by the students included family support, peer support, and support provided by assistants. The participants also shared strategies they used to deal with the barriers they faced. These were assertiveness, self-determination, metacognition, efforts to ‘fit in’, optimism, and career planning. The implications for policy and universities are discussed.  相似文献   

中医院校复合型英语教师知识结构多元化的构建及其意义     

涂宇明  李涛安  韩露 《鸡西大学学报》2013,(1):75-77

随着中医药教育的国际化进程,既懂医学又懂英语的复合型英语教师匮乏的问题日益凸显。拟从国际交流角度,前瞻中医教育未来之发展,研究新形势下复合型英语教师知识结构多元化的构建及其意义。  相似文献   

The Ultimate Beneficiaries of Continuing Professional Development Programs: Middle School Students’ Nature of Science Views     

&#;zer  Ferah  Do&#;an  Nihal  Yalaki  Yal&#;&#;n  Irez  Serhat  &#;akmakci  G&#;ltekin 《Research in Science Education》2019,51(2):757-782

The effective continuing professional development (CPD) programs primarily aim to have an impact on teachers’ knowledge bases, beliefs, and views and their classroom practices, which rationally lead most of the researchers to investigate those changes on teachers primarily. Although neglected, the interrelationship between CPD programs and students is considered complex, and CPDs ultimately aim to have an impact on students’ views, too. Therefore, the purpose of this study is to survey the changes of middle school students’ views of the nature of science (NOS) by providing a large-scale CPD to their teachers and, in other words, identify the impact of CPD on ultimate beneficiaries, namely students. In this study, 10 science teachers’ data and, in the first phase, 481 and, in the second phase, 422 students’ data and the changes in their NOS views were analyzed. Results showed that the students’ and teachers’ NOS views changed positively. For the impact of teachers on the students’ views, the teachers’ prior NOS knowledge, years of experience, and the number of implemented activities were found to be the influential factors for the transmission of NOS views.

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Train of Thought and Exploring in Regarding to Course Building to Higher Vocational Education     

Rong Shu an  Liao Yu qing 《出版与印刷》2008,(1)

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Kidney function change after transcatheter aortic valve replacement in patients with diabetes and/or hypertension     

Jiaqi FAN  Changjie YU  Kaida REN  Wanbing LIN  Stella NG  Zexin CHEN  Xinping LIN  Lihan WANG  Qifeng ZHU  Yuxin HE  Jubo JIANG  Xianbao LIU  Jian'an WANG 《Journal of Zhejiang University. Science. B》2021,22(3):241-247

Aortic stenosis(AS)is a progressive heart valve disease occurring predominantly in older patients.According to a survey in a western country,the prevalence of AS is nearly 6.4%in patients over 75 years old(Carabello and Paulus,2009).Transcatheter aortic valve replacement(TAVR)is an alternative method for AS patients.Previous studies have described how up to 66%of TAVR patients have concomitant baseline kidney dysfunction(Ferro et al.,2015;Gargiulo et al.,2015).The majority of patients can benefit from the TAVR procedure with the recovery of kidney function.  相似文献