547 research outputs found
Zero-Hopf bifurcation in a Chua system
No full textAgraïments: The first author is supported by the FAPESP-BRAZIL grants 2010/18015-6, 2012/05635-1, and 2013/25828-1. The second author is partially supported by FEDER-UNAB-10-4E-378, and a CAPES grant 88881. 030454/2013-01 do Programa CSF-PVE.A zero-Hopf equilibrium is an isolated equilibrium point whose eigenvalues are ±ωi ̸= 0 and 0. In general for a such equilibrium there is no theory for knowing when it bifurcates some small-amplitude limit cycles moving the parameters of the system. Here we study the zero-Hopf bifurcation using the averaging theory. We apply this theory to a Chua system depending on 6 parameters, but the way followed for studying the zero-Hopf bifurcation can be applied to any other di erential system in dimension 3 or higher. In this paper rst we show that there are three 4-parameter families of Chua systems exhibiting a zero-Hopf equilibrium. After, by using the averaging theory, we provide su cient conditions for the bifurcation of limit cycles from these families of zero-Hopf equilibria. From one family we can prove that 1 limit cycle bifurcates, and from the other two families we can prove that 1, 2 or 3 limit cycles bifurcate simultaneously
Chinese education in the novel by A. Chua Battle hymn of the tiger mother
No full textChinese culture and tradition stand in direct opposition to American and European cultures. Chinese children must live according to the principles of metaconfucianism from an early age. Failure to do so threatens social ostracism.
Amy Chua in her autobiographical novel Battle Hymn of the Tiger Mother describes the education of her two daughters living in America according to the principles present in China. The educational methods used by Chua are considered controversial by western parents. The author made an attempt to explain the motives of Asian mothers.
A Tribute to the Life and Work of Jess Chua
No full textJess Chua was a leading scholar in the field of family business and a major contributor to Entrepreneurship Theory and Practice both as an author and editor. His significant contributions to the field were acknowledged by the Web of Science, which listed him among the world\u27s most highly cited researchers in Economics and Business in 2017, 2019, and 2020. In this memorial editorial, we pay tribute to him by discussing his influence on the field through his academic work, mentoring, long-term collaborations with other scholars, and the kindness he and his wife, Eva Kan, showed to his colleagues and students
A Tribute to the Life and Work of Jess Chua
No full textJess Chua was a leading scholar in the field of family business and a major contributor to Entrepreneurship Theory and Practice both as an author and editor. His significant contributions to the field were acknowledged by the Web of Science, which listed him among the world’s most highly cited researchers in Economics and Business in 2017, 2019, and 2020. In this memorial editorial, we pay tribute to him by discussing his influence on the field through his academic work, mentoring, long-term collaborations with other scholars, and the kindness he and his wife, Eva Kan, showed to his colleagues and students
Author response image 1. Correlation of phosphosites between biological replicates.
No full textNeurotransmitter release is mediated by the fast, calcium-triggered fusion of synaptic vesicles with the presynaptic plasma membrane, followed by endocytosis and recycling of the membrane of synaptic vesicles. While many of the proteins governing these processes are known, their regulation is only beginning to be understood. Here we have applied quantitative phosphoproteomics to identify changes in phosphorylation status of presynaptic proteins in resting and stimulated nerve terminals isolated from the brains of Wistar rats. Using rigorous quantification, we identified 252 phosphosites that are either up- or downregulated upon triggering calcium-dependent exocytosis. Particularly pronounced were regulated changes of phosphosites within protein constituents of the presynaptic active zone, including bassoon, piccolo, and RIM1. Additionally, we have mapped kinases and phosphatases that are activated upon stimulation. Overall, our study provides a snapshot of phosphorylation changes associated with presynaptic activity and provides a foundation for further functional analysis of key phosphosites involved in presynaptic plasticity
Development of collagen scaffold with internal channels via indirect rapid prototyping
No full text202 p.The author would like to take this opportunity to acknowledge the contribution of anumber of people for this project. The realization of the project would not have beenpossible without the advice and assistance from them.The author wishes to express her sincere gratitude and appreciation to A/P Chua CheeKai, A/P Leong Kah Fai and Dr. Margam Chandrasekaran, for their invaluable adviceand motivation throughout the project. Appreciation is also extended to As/P AlastairCampbell Ritchie from the School of Mechanical and Aerospace Engineering, NTU,and Mr Timothy Tan and Dr Peter Lee from DNA Center, NIE, for their guidance inthe project. Heartfelt thanks to Ms Hu Quijun, from SIMTech for her guidance andsupport.DOCTOR OF PHILOSOPHY (MAE
Conversion, continuity, and moral dilemmas among Christian Bidayuhs in Malaysian Borneo
No full textThis is the author's final version of the article (under the title "Speaking of continuity... Religious change and moral dilemmas among Christian Bidayuhs in Malaysian Borneo"). The final publication is available from the link below. Copyright @ 2012 by the American Anthropological Association.The nascent anthropology of Christianity highlights rupture as central to conversion. Yet thick ethnography of a Bidayuh village in Malaysian Borneo reveals how conversion can also foster modes of thinking and speaking about continuity between Christianity and “the old ways.” Through a study of the shifting moral and religious topography of a community in which three churches coexist alongside a few elderly animist practitioners, I argue that such discourses and practices of continuity highlight the pluralistic and sometimes contradictory nature of Christianization. At the same time, they generate an understanding of conversion as a temporal and relational positioning that encompasses both converts and nonconverts.William Wyse Fund, Evans Fund, Smuts Memorial Fund, and Sir Bartle
Frere’s Memorial Fund at the University of Cambridge and a Horniman/Sutasoma Award from the Royal Anthropological Institute
Gallai-Colorings of Triples and 2-Factors of B[subscript 3]
No full textA coloring of the edges of the r-uniform complete hypergraph is a G[subscript r]-coloring if there is no rainbow simplex; that is, every set of r + l vertices contains two edges of the same color. The notion extends G[subscript 2]-colorings which are often called Gallai-colorings and originates from a seminal paper of Gallai. One well-known property of G[subscript 2]-colorings is that at least one color class has a spanning tree. J. Lehel and the senior author observed that this property does not hold for G[subscript r]-colorings and proposed to study f[subscript r](n), the size of the largest monochromatic component which can be found in every G[subscript r]-coloring of K[r over n], the complete r-uniform hypergraph. The previous remark says that f[subscript 2](n) = n, and in this note, we address the case r = 3. We prove that [(n + 3)/2] ≤ f[subscript 3](n) ≤ [4n/5], and this determines f[subscript 3](n) for n < 7. We also prove that f[subscript 3](7) = 6 by excluding certain 2-factors from the middle layer of the Boolean lattice on seven elements
Absolute Music / Absolute Worship
No full textThis chapter explores the nature and history of ‘absolute’ (or ‘unconditional’) music, and its relevance for Christian worship today. The author sums up absolute music’s history with two numbers, one and zero. The first represents Pythagorean notions of music’s organized, enchanted, and immaterial cosmology, of metaphysics before physics, a world where musical unity reveals universal harmony. Zero, meanwhile, stands in for the modern era and its relinquishing of musical cosmology for a more materialist, human, and logocentric conception of reality (and music) that disenchanted the universe but enchanted the now enlightened, emancipated humanity instead. It is exemplified by the 16th century birth of the opera and the philosophy of Jean-Jacques Rousseau. A third direction, a synthesis of both ideas, is found in Immanuel Kant’s conception of human autonomy and the ineffable sublime and is played out in the music of Ludwig van Beethoven. Chua critiques each perspective and parses their influence on church music and theology, suggesting that an epistemology of music directly impacts a theology of worship. He asks ultimately what distinctively Christian, trinitarian worship should look like today
Author response
No full textSmall GTPases of the Rab family not only regulate target recognition in membrane traffic but also control other cellular functions such as cytoskeletal transport and autophagy. Here we show that Rab26 is specifically associated with clusters of synaptic vesicles in neurites. Overexpression of active but not of GDP-preferring Rab26 enhances vesicle clustering, which is particularly conspicuous for the EGFP-tagged variant, resulting in a massive accumulation of synaptic vesicles in neuronal somata without altering the distribution of other organelles. Both endogenous and induced clusters co-localize with autophagy-related proteins such as Atg16L1, LC3B and Rab33B but not with other organelles. Furthermore, Atg16L1 appears to be a direct effector of Rab26 and binds Rab26 in its GTP-bound form, albeit only with low affinity. We propose that Rab26 selectively directs synaptic and secretory vesicles into preautophagosomal structures, suggesting the presence of a novel pathway for degradation of synaptic vesicles
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