1,721,083 research outputs found
Optimal parameters of rotational inerter double tuned mass damper for different excitation and response combinations
No full textThe Rotational Inerter Double Tuned Mass Damper (RIDTMD) is a vibration mitigation device derived by substituting the damping element in a conventional Tuned Mass Damper (TMD) with an inerter-based system. Under the same tuned mass ratio condition, RIDTMD has better vibration damping effectiveness than TMD. However, it is difficult to obtain the analytical solution of RIDTMD optimal parameters, which severely limits the application of RIDTMD in the engineering field. To address this problem, this study utilizes the Genetic Algorithm-Nonlinear Programming (GA-NLP) algorithm to obtain the analytical solution of RIDTMD, and the optimal parameters formulation of RIDTMD is given by numerical fitting technique. Under random force excitation, the optimal parameters of the RIDTMD are obtained based on optimization criteria H2 and H∞, with the displacement and acceleration of primary structure serving as the optimization objectives, respectively. The same method is used to obtain the optimal parameters of RIDTMD under base displacement excitation. Finally, the validity of the optimal parameters of RIDTMD was verified through frequency-domain analysis and time-domain analysis
Mechanism study on the effect of floor rotation angle on supported tuned mass damper system of high-rise structure
No full textThe bending deformation of the super high-rise structures will cause floor rotation angle, and thus affect the vibration reduction effect of the supported tuned mass damper (TMD) system. This paper proposes a motion equation of the TMD control system with the effect of floor rotation angle. Firstly, a finite element model of the supported TMD control system was established by ETABS. Secondly, the formation and floor rotation angle parameters of the structure were obtained by ETABS modal analysis. Then, the structures ETABS model is simplified into a multi-degree-of-freedom (MDOF) model based on the dynamic characteristics of the structure. This paper also presents an evaluation index of the effect of floor rotation angle on the supported TMD system and a supported TMD control system is selected as a simulation example. The relationship between the floor rotation angle coefficient and the TMD parameters is later parametric analyzed. Finally, experiments were designed to verify the effect of floor rotation angle on the supported TMD control system. The experimental results show that the relationship between the rotation angle of the first formation floor and the generalized displacement of the first formation of the assumed structure is close to linear. Therefore, the effect of floor rotation angle of the structure is highly recommended to be considered as an important factor for the design of the supported TMD control system for super high-rise structures
Cenozoic faulting of the Bohai Bay Basin and its bearing on the destruction of the eastern North China Craton
No full textAbstract not availableSanzhong Li, Guochun Zhao, Liming Dai, Lihong Zhou, Xin Liu, Yanhui Suo, M. Santos
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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