Rocking of a rigid block freestanding on a flat pedestal     

Antonio Gesualdo  Antonino Iannuzzo  Michela Monaco  Francesco Penta 《浙江大学学报(A卷英文版)》2018,19(5):331-345

The seismic protection of objects contained within museums is a topic of great interest, especially with reference to how they are displayed or stored. This problem is the same as that of a large class of non-structural components, such as mechanical and electrical hospital and laboratory equipment that could lose their functionality because of earthquakes. Statues and ceramics simply supported on the floor represent a significant set of case. In some cases, like the Bronzes of Riace, isolation systems have been developed. However, in general museum exhibits are not equipped with devices capable of mitigating the oscillations induced by possible earthquakes. The case study of a marble statue placed on a freestanding squat rigid pedestal is examined. The system of algebraic differential equations governing the problem has been derived and included in an ad-hoc numerical procedure. It is shown that the insertion of a squat rigid body with low frictional resistance at the lower interface with the floor, and high frictional resistance at the upper interface with the artifact significantly reduces the amplitude of the rocking response. As a result the artifact rocks without sliding on the rigid base that slides without rocking with respect to the floor. The numerical analysis performed can be a tool to help in the choice of the optimal friction values in the surfaces of the flat block, designed as a simple isolation system.  相似文献   

Transitions in the representation and implementation of a language-learning project within a multicultural context     

Arcidiacono  Francesco  Padiglia  Sheila  Miserez-Caperos  Céline 《European Journal of Psychology of Education - EJPE》2019,34(1):239-254

European Journal of Psychology of Education - The paper explores the involvement of teachers, children, and parents in a project based on learning a second language (L2) within a multicultural...  相似文献   

水平支座上独立式刚性块的摆动模型（英文）     

Antonio GESUALDO  Antonino IANNUZZO  Michela MONACO  Francesco PENTA 《浙江大学学报(A卷英文版)》2018,(5)

目的:本研究集中探讨水平支座上独立放置简单叠合的双刚性块的动力学行为,旨在通过构建并求解合适的动力学数值模型以助于设计可广泛适用于博物馆、实验室和医院的保护小型艺术品或装置的隔振系统。创新点:1.研究对象为两个叠合在一起的刚性块,较以往同类问题中的单一刚性块,更具现实意义;2.同时研究了刚性块的摆动和滑动两类运动模式。方法:1.基于达朗贝尔原理构建摆动控制方程,分析单刚体情形下的摆动并利用数值手段描述其滑动状态;2.在分析单刚体的基础上构建双刚体控制方程组并对其进行数值求解。结论:1.通过研究大理石雕塑置于蹲式刚性基底上且基底独立放置在移动地面上的情形发现,相比于滑动,雕塑自身的摆动是造成其损坏的主要原因;2.在某些情况下,刚体表面延迟的存在可以避免细长刚性块的翻转,尤其是对于那些细长的摇摆块体以及上部块体质量增加的情形;3.本文提出的数值分析可以成为优化简易隔振系统的一个有效工具。  相似文献   

La Réunion d'experts sur la présentation des cultures d'Asie dans les manuels et le matériel d'enseignement des pays occidentaux,Paris, mai 1956     

Francesco Melzi d'Eril 《International Review of Education/Internationale Zeitschrift für Erziehungswissenschaft/Revue internationale l'éducation》1957,3(1):112-114

Sans résumé  相似文献   

Tuning engineering education into the European higher education orchestra     

Francesco Maffioli 《European Journal of Engineering Education》2003,28(3):251-273

The ‘Bologna process’ is promoting fundamental changes throughout European higher education. Education ministers appear determined to reach, by 2010, a significant convergence of the national educational systems. This implies the necessity of adapting curricula in terms of structures, contents, learning attributes, learning tools and assessment methods. The EC ‘Tuning’ project was set up in order to investigate the feasibility of this process on the basis of ‘available experience and recent developments in several of the Member states… particularly from previous and on-going European co-operation in the context of the Socrates programme’. The Tuning project, initially aimed at five areas only (mathematics, geology, business, history, educational sciences), was later extended to other areas, including engineering: synergy groups were formed for this purpose. This paper summarizes the final report of the Engineering Synergy Group, which examined the ‘tuning’ of engineering education (EE) into European higher education, taking advantage of the work of previous and current thematic networks, such as H3E, EUCEET and E4. A set of recommendations is presented in the final section of the paper.  相似文献   

Photography     

Kelly Wise  Jeffrey Weiss  Herbert H. Wise  Marious B. Peladeau  A.D. Coleman  Francesco Scavullo 《Communication Booknotes Quarterly》2013,44(10):158-160

The Portfolios of Ansel Adams (Boston: New York Graphic Society, 1977—$19.50)

Kelly Wise's Still Points (Addison House, Morgan's Run, Danbury, N.H. 03230—$8.95, paper)

Jeffrey Weiss and Herbert H. Wise, Good Lives (New York: Quick Fox, with distribution by Hyperion Press of Westport, Ct., 1977—$6.95, paper)

The Best of Photojournalism 2 (New York: Newsweek Books, 1978—$16.95/9.95)

Marious B. Peladeau's Chansonetta: The Life and Photographs of Chansonetta Stanley Emmons 1858-1937 (Dobbs Ferry, N.Y.: Morgan and Morgan, l977—$8.95)

A.D. Coleman's The Grotesaue in Photography (New York: Ridge Press/Summit Books [Simon and Schuster], 1977—$10.00 1 paper)

Francesco Scavullo, et al. Scavullo on Men (N.Y.: Random House, 1977—$15.00)

Barbra Walz and Bernadine Morris's The Fashion Makers: An Inside Look at America's Leading Designers (N.Y. :Random House, 1978— $15.00)

Charles Klamkin and Matthew Isenberg's Photographica: A Guide to the Value of Historic Cameras and Images (New York: Funk & Wagnalls, 1978—$15.95)

Genoa Caldwell, ed. The Man Who Photographed the World: Burton Holmes Travelogues, 1892-1938 (New York: Harry Abrams, 1977—$25.00)

Peter Pollack's The Picture History of Photography: From the Earliest Beginnings to the Present Day (New York: Harry Abrams, 1977—$8.95, paper)  相似文献   

The importance of accounting for the number of co-authors and their order when assessing research performance at the individual level in the life sciences     

Giovanni Abramo  Ciriaco Andrea D’Angelo  Francesco Rosati 《Journal of Informetrics》2013,7(1):198-208

Accurate measurement of research productivity should take account of both the number of co-authors of every scientific work and of the different contributions of the individuals. For researchers in the life sciences, common practice is to indicate such contributions through position in the authors list. In this work, we measure the distortion introduced to bibliometric ranking lists for scientific productivity when the number of co-authors or their position in the list is ignored. The field of observation consists of all Italian university professors working in the life sciences, with scientific production examined over the period 2004–2008. The outcomes of the study lead to a recommendation against using indicators or evaluation methods that ignore the different authors’ contributions to the research results.  相似文献   

Is there a real diagnostic impact of elastosonography and contrast-enhanced ultrasonography in the management of thyroid nodules?     

Massimo GIUSTI  Davide ORLANDI  Giulia MELLE  Barbara MASSA  Enzo SILVESTRI  Francesco MINUTO  Gianni TURTULICI 《Journal of Zhejiang University. Science. B》2013,14(3):195-206

Ultrasonography(US) and the new applications US elastography(USE) and contrast-enhanced US(CEUS) are used in the screening of thyroid nodules,for which fine-needle aspiration biopsy(FNAB) is the best single diagnostic test.The aim of the study was to compare the sensitivity,specificity,positive predictive value(PPV),and accuracy of the four examinations in nodules with cytological and histological diagnoses.The study used data from US,FNAB,USE(elasticity(ELX 2/1) index),and CEUS(Peak index and time to peak(TTP) index) evaluated in 73 thyroid nodules in 63 consecutive patients likely to undergo surgery.Cytological-histological correlation was available for 38 nodules.No correlation emerged between nodule size and cytological results.A significant(P=0.03) positive correlation between cumulative US findings and cytological results was found.In addition,significant correlations between cumulative US findings and cytology(P=0.02) and between cumulative US findings and histology(P<0.0001) were found.US showed the best specificity and PPV,and FNAB the best sensitivity.There was no significant difference in the ELX 2/1 index,Peak index,or TTP index among nodules subdivided according to cytological scores.No significant correlation was found between ELX 2/1 index,Peak index,and TTP index,on the one hand,and nodule size,US cumulative findings,cytology,and histology on the other hand.The sensitivity of the ELX 2/1 index was high,but its specificity was very low.The accuracy and PPV of USE were lower than those of the other procedures.Only the correlation between Peak index and cumulative US findings reached a value close to significance.Our ultimate aim is to minimise unnecessary thyroidectomy.US and FNAB continue to play a central diagnostic role.The use of a US score showed high specificity and PPV.The specificity of FNAB was low in this selected series because of the numbers of indeterminate cytological responses.USE and CEUS are innovative techniques that need to be standardized.The ELX 2/1 index,Peak index,and TTP index seem to be unrelated to histology.The best statistical data on USE and CEUS concerned their sensitivity and PPV,respectively.At present,USE and CEUS are too time-consuming and of limited utility in selecting patients for surgery.  相似文献   

A Multidimensional Finite Mixture Structural Equation Model for Nonignorable Missing Responses to Test Items     

Silvia Bacci  Francesco Bartolucci 《Structural equation modeling》2013,20(3):352-365

We propose a structural equation model, which reduces to a multidimensional latent class item response theory model, for the analysis of binary item responses with nonignorable missingness. The missingness mechanism is driven by 2 sets of latent variables: one describing the propensity to respond and the other referred to the abilities measured by the test items. These latent variables are assumed to have a discrete distribution, so as to reduce the number of parametric assumptions regarding the latent structure of the model. Individual covariates can also be included through a multinomial logistic parameterization for the distribution of the latent variables. Given the discrete nature of this distribution, the proposed model is efficiently estimated by the expectation–maximization algorithm. A simulation study is performed to evaluate the finite-sample properties of the parameter estimates. Moreover, an application is illustrated with data coming from a student entry test for the admission to some university courses.  相似文献   

The Contribution of the Theory of Relation to Knowledge to Understanding Students’ Engagement in Learning Physics     

Patrice Venturini 《International Journal of Science Education》2013,35(9):1065-1088

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