1,721,507 research outputs found
A MEMS sensor for stiffness change sensing applications based on three weakly coupled resonators
No full textMicro-electro-mechanical (MEM) resonator devices have been widely used to sense small changes in the properties of the resonator, namely the stiffness and mass of the resonator. Among these, sensing devices that detect stiffness change have been employed for many applications, including accelerometers, strain sensors, pressure sensors and force gradient sensors for imaging microscopy. In recent years, a new sensing approach, which utilises 2 degree-of-feedom (DoF) weakly coupled resonators has been proposed. By measuring the mode shape changes instead of the frequency shifts, it has been shown that this type of sensing devices has: 1) orders of magnitude higher sensitivity than conventional single DoF resonator sensors; 2) common mode rejection capabilities.This thesis introduces a novel structure, based on three weakly coupled resonators (i.e. a 3DoF system), in which the stiffness of the resonator in the middle is at least twice the value compared to the other two identical resonators. The device is intended for sensing a change in stiffness. With the 3DoF resonator sensing device, another order of magnitude improvement in the stiffness sensitivity could be demonstrated.In addition to the novel 3DoF coupled resonator structure, we have also investigated a few practical aspects of the coupled resonator sensing devices that have not been addressed in previous research. These aspects include the damping, dynamic range, nonlinearity and output metrics of the sensor. We have also found a trade-off between the sensitivity and the dynamic range. To solve this dilemma, a bias operation point has also been proposed. By using the bias operation point, it was shown in theory that the linearity of the sensors can also be improved.Finally, we have also theoretically estimated the vibrational amplitudes and phase delays of each individual resonators within the 3DoF system at the out-of-phase mode frequency. Furthermore, based on these estimations, we have proposed a feasible self oscillating loop structure, which has the capability of automatically locking to the out-of- phase mode frequency
FIGURES 27−38 in A new species of Metacoelura (Collembola: Paronellidae) from Australia, and redescription of Metacoelura articulata
No full textFIGURES 27−38. Metacoelura majeri sp. nov. 27, habitus; 28, apex of Ant. IV; 29, eyes and interocular chaetotaxy; 30, labrum; 31, labial palp; 32, labium; 33, chaetotaxy of Th. II & III; 34, trochanteral organ; 35, chaetotaxy of Abd. I−III; 36, chaetotaxy of Abd. IV; 37, anterior face and lateral flap of ventral tube; 38, distal part of posterior face of ventral tube.Published as part of Ma, Yitong, Zhao, Chun & Greenslade, Penelope, 2016, A new species of Metacoelura (Collembola: Paronellidae) from Australia, and redescription of Metacoelura articulata, pp. 381-388 in Zootaxa 4105 (4) on page 387, DOI: 10.11646/zootaxa.4105.4.6, http://zenodo.org/record/27131
Phylogeny of Phyllachora species on bamboo and P. cephalostachyi sp. nov. from China
No full textLi, Xiao-Ling, Yu, Hai-Ying, Luo, Xi, Wu, Hao, Zhao, Chun-Yan, Promputtha, Itthayakorn, Sun, Da-Feng (2021): Phylogeny of Phyllachora species on bamboo and P. cephalostachyi sp. nov. from China. Phytotaxa 514 (2): 158-166, DOI: 10.11646/phytotaxa.514.2.7, URL: http://dx.doi.org/10.11646/phytotaxa.514.2.
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Metacoelura
No full textKey to the species of the genus <i>Metacoelura</i> <p> 1. Abd. II with two inner mac............................................... <i>varicolor</i> Yoshii & Suhardjono, 1992 -. Abd. II with more than two inner mac..................................................................... 2 2. Abd. II with 6 or 7 inner mac......................................................... <i>articulata</i> (Schött, 1917) -. Abd. II with 10−14 inner mac................................................................ <i>majeri</i> <b>sp. nov.</b></p>Published as part of <i>Ma, Yitong, Zhao, Chun & Greenslade, Penelope, 2016, A new species of Metacoelura (Collembola: Paronellidae) from Australia, and redescription of Metacoelura articulata, pp. 381-388 in Zootaxa 4105 (4)</i> on page 386, DOI: 10.11646/zootaxa.4105.4.6, <a href="http://zenodo.org/record/271314">http://zenodo.org/record/271314</a>
Paronellidae Borner 1913
No full textParonellidae Börner, 1913 <p> <i>Metacoelura</i> Salmon, 1951: 23.</p> <p> Type species: <i>Coelura articulata</i> Schött, 1917: 25 −26. Type locality: Alice River, 15o 30’N, 143o 15’E, north Queensland, Australia.</p> <p> <b>Main characters of the genus</b>. Habitus slender; appendages long, including antennae, legs and furcula; scales absent; mucro falcate; dens with only slight crenellations.</p>Published as part of <i>Ma, Yitong, Zhao, Chun & Greenslade, Penelope, 2016, A new species of Metacoelura (Collembola: Paronellidae) from Australia, and redescription of Metacoelura articulata, pp. 381-388 in Zootaxa 4105 (4)</i> on page 382, DOI: 10.11646/zootaxa.4105.4.6, <a href="http://zenodo.org/record/271314">http://zenodo.org/record/271314</a>
状位情感形容词与述位动词结构同现的原则
No full textAuthor name used this publication: 赵春利, Zhao Chun-liTitle in Traditional Chinese: 狀位情感形容詞與述位動詞結構同現的原則Journal title in Traditional Chinese: 漢語學習2010-2011 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishedVoR allowe
Variations on the Author
Get PDF“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
Get PDFWe 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
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