1,721,416 research outputs found
Symmetries in toric topology
No full textA polyhedral product (X,A)K is determined by a finite simplicial complex K and m pairs of topological spaces. The functorial property of polyhedral products implies two types of symmetries of polyhedral products induced by symmetries of simplicial complexes and by group actions on the topological pairs. In this thesis, we consider these two types of symmetries.In the case of G-polyhedral products induced by a simplicial G-complex K, we show that the homotopy decomposition Sigma (X,A)K due to Bahri-Bendersky-Cohen-Gitler [3] is homotopy G-equivariant after suspension. It implies a homological decomposition of Hi((X,A)K) in terms of G-representations, which we rely on to study the representation stability of polyhedral product in the sense of Church-Farb [15].The torus actions on moment-angle complexes ZK is a special case of actions on polyhedral products induced by actions on the topological pairs. In this thesis, we compute the cohomology of the quotient ZK/S1 under free circle actions and introduce a chain complex (C*(L),δ) whose homology isomorphic to H*(ZK/S1;R). For certain cases K, we determine the homotopy types of ZK/S1
Simplicial <i>G</i>-complexes and representation stability of polyhedral products
No full textRepresentation stability in the sense of Church and Farb is concerned with stable properties of representations of sequences of algebraic structures, in particular of groups. We study this notion on objects arising in toric topology. With a simplicial G–complex K and a topological pair (X, A), a G–polyhedral product (X, A)
K is associated. We show that the homotopy decomposition of Σ(X,A)
K is then G–equivariant after suspension. In the case of †Σ
m–polyhedral products, we give criteria on simplicial Σ
m–complexes which imply representation stability of Σ
m–representations {H
i((X,A)
Km)}
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Cardioprotective effects of Dan-Yang-Fu-Xin decoction on chronic heart failure in rats
Full text linkPurpose: To evaluate the cardioprotective effects and possible mechanisms of Dan-Yang-Fu-Xin decoction (DYFX) in a rat chronic heart failure (CHF).Methods: A CHF rat model induced by ligation of the left anterior descending coronary artery was used to investigate the cardioprotective effects of DYFX. After intragastric administration for 8 weeks, several functional cardiac indices, including fractional shortening (FS), ejection fraction (EF), heart rate (HR) and cardiac output (CO) were assessed by ultrasound examination. Subsequently, inflammatory markers, viz, interleukin-6 (IL-6) and tumor necrosis factor-α (TNF-α), myocardial enzymes, namely, lactate dehydrogenase (LDH) and creatine kinase (CK), were also assessed by enzyme-linked immunosorbent assay (ELISA).Results: Intragastric administration of DYFX (200, 400 and 600 mg/kg) significantly reversed the decrease in body weight and increase in cardiac weight (p < 0.05) induced by CHF. Treatment with DYFX also significantly reversed EF, FS, HR, and CO changes in CHF rats. In addition, DYFX inhibited the two inflammatory cytokines (TNF-α and IL-6) and myocardial enzymes (CK and LDH), suggesting that these effects may include the mechanisms of cardioprotectiion involved in attenuation of CHF.Conclusion: DYFX possesses cardioprotective effects involving CHF. The protective mechanisms may include the suppression of expression of inflammatory mediators and myocardial enzymes.Keywords: Dan-Yang-Fu-Xin decoction, Cardioprotection, Chronic heart failure, Inflammatory mediators, Myocardial enzyme
FIGURE 26 in Taxonomy and behaviour of lucioline fireflies (Coleoptera: Lampyridae: Luciolinae) with redefinition and new species of Pygoluciola Wittmer from mainland China and review of Luciola LaPorte
No full textFIGURE 26. Larva: head, anterior half, ventral. Scale bar = 0.5 mm. L, lacinia; LP, labial palp; MP, maxillary palp; PM, prementum; POM, postmentum.Published as part of Fu, Xin Hua & Ballantyne, Lesley, 2008, Taxonomy and behaviour of lucioline fireflies (Coleoptera: Lampyridae: Luciolinae) with redefinition and new species of Pygoluciola Wittmer from mainland China and review of Luciola LaPorte, pp. 1-44 in Zootaxa 1733 on page 29, DOI: 10.5281/zenodo.18138
Modeling and preliminary analysis of a miniaturized rotary motor driven by single piezoelectric stack actuator
No full textThis paper presents a compact motor (6 mm in diameter) with a single piezoelectric stack actuator and a frame structured stator, which works under the principle of natural inchworms. Preliminary motion analysis and dynamic modeling are conducted based on the assumption of structural rigidity. The prototype can generate output torque of about 279 nNm and speed up to 200 rpm with a power input of 60 Vpp at the frequency of 12.7 kHz. In addition, rotational concentricity of the motor is discussed via analyzing captured video of the operating motor. Compared with the previous prototype that is 17 mm in diameter, the simplicity of the motor structure provides an effective miniaturization solution, which is important to many applications such as medical instruments and consumer electronics
Homotopy rigidity for quasitoric manifolds over a product of d-simplices
No full textFor a fixed integer d ≥ 1, we show that two quasitoric manifolds over a product of d-simplices are homotopy equivalent after appropriate localization, provided that their integral cohomology rings are isomorphic.<br/
Pteroptyx maipo Ballantyne, a new species of bent-winged firefly (Coleoptera: Lampyridae) from Hong Kong, and its relevance to firefly biology and conservation
No full textBallantyne, Lesley, Fu, Xin Hua, Shih, Chun-Hat, Cheng, Chui-Yu, Yiu, Vor (2011): Pteroptyx maipo Ballantyne, a new species of bent-winged firefly (Coleoptera: Lampyridae) from Hong Kong, and its relevance to firefly biology and conservation. Zootaxa 2931: 8-34, DOI: 10.5281/zenodo.27803
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
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