182 research outputs found
First person – Kengo Takahashi
No full textABSTRACT
First Person is a series of interviews with the first authors of a selection of papers published in Journal of Cell Science, helping early-career researchers promote themselves alongside their papers. Kengo Takahashi is the first author on ‘Glucose deprivation induces primary cilium formation through mTORC1 inactivation’, published in Journal of Cell Science. Kengo is a PhD student in the laboratory of Kensaku Mizuno at Tohoku University, Sendai, Japan, where he investigates the link between nutrient conditions and ciliogenesis.</jats:p
Designing a Flexible and Transparent Ultrarapid Electrothermogenic Film Based on Thermal Loss Suppression Effect: A Self-Fused Cu/Ni Composite Junctionless Nanonetwork for Effective Deicing Heater
No full textTransparent heaters (THs) are one-size-fits-all
materials used in electronics such as smart windows, wearable
applications, and deicing devices. Copper-based THs, which
are the most promising materials, still face some problems such
as increasing electrical resistance at the intersections of each
nanowire and easy degradation owing to oxidation. To overcome
these problems, the formation of a junctionless network
whose nanowire intersections are fused by using a composite
of copper and the oxidation-resistant material is considered as
one of the best strategies. Herein, we report a junctionless
copper/nickel-nanonetwork-based TH formed on a polymer
nanofiber by combining electrospinning and electroless deposition.
This two-step wet process enables the formation of a junctionless network composed of a copper/nickel alloy. The THs
showed outstanding heating characteristics (the power efficiency reached 421.7 °C cm2/W) which are suitable for the deicing
application. Furthermore, we revealed that prominent heating characteristics are realized because of decreasing thermal loss at
intersections during application of current, which we term “thermal loss suppression effect”. Simulating thermal losses at intersection
models of a junctionless network and a junction network based on the finite element method, we estimated the thermal
loss originated from the network geometry. This insight may contribute to the design of high-performance electrothermal
materials
Integrated Anti-Icing Property of Super-Repellency and Electrothermogenesis Exhibited by PEDOT:PSS/Cyanoacrylate Composite Nanoparticles
No full textIce formation causes numerous problems in many industrial fields as well as in our daily life. Various functional anti-ice coatings have been extensively studied during the past several decades; however, the development of feasible ice-repellent surfaces with long-term stability has been found to be extremely difficult. Here, we report the conductive superhydrophobic coatings with freezing rain repellency that simultaneously possess electrothermogenic ability to rapidly melt newly formed frosts due to the Joule heat. The obtained films have high mechanical flexibility and abrasion resistance produced by composite nanoparticles of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) embedded in ethyl cyanoacrylate. In addition, excellent water repellency (corresponding contact angle >160°) and efficient heating ability (with an estimated energy consumption as low as 260.8 °C cm2/W) generated by applying voltage through the conductive film surface have been demonstrated. The proposed concept of combining super-repellency with electrothermal heating may provide a new strategy of addressing problems related to ice formation
A superrepellent coating with dynamic fluorine chains for frosting suppression: Effects of polarity, coalescence and ice nucleation free energy barrier
No full textIce formation on surfaces is a serious issue in many different fields in terms of function, safety, and cost of operation in human life. Hydrophobic coating technology is one of the effective ways to prevent ice formation. Previous studies focused on the effects of surface structure and surface chemical modification on anti-icing ability. However, only a few studies have clarified a method to inhibit the initial formation of ice on surfaces; in addition, an effective mechanism for anti-frosting has not been identified as yet. Here, hydrophobic smooth surface coatings using three coupling agents with low surface energy and different molecular chain dynamics were fabricated. The surface roughnesses were lower than 1 nm. The fluorocarbon-based coatings delayed frost formation compared with the uncoated surface until -6 °C. We explored why the coating surface prevented frost formation and the effects of surface chemical modification on frost resistance from the viewpoint of heat exchange contact area during droplet coalescence, ice nucleation free energy barrier, polarity and polarizability of the coated surface
Temas de projeto: um estudo de conceito de Antiobjeto de Kengo Kuma em paralelo com Lina Bo Bardi
No full textA presente dissertação desenvolveu-se a partir da leitura do livro Architecture Words 2:
Anti-Object de Kengo Kuma. Nele o autor elabora a partir de sete temas de projeto um conceito oposto ao tipo de arquitetura que considera coerciva e arbitrária. Cada tema é conceituado teoricamente e exemplificado com um projeto selecionado do autor. A proposta do trabalho é analisar caso a caso cada um dos sete temas e identificar ferramentas e mecanismos de projetos. Os projetos apresentados são colocados em paralelo com a arquiteta Lina Bo Bardi e então são observadas características de afinidade ou disparidade entre ambos. Algumas escolhas das obras para o paralelo deram-se a partir de semelhanças com o próprio tema de projeto que Kuma apresenta, enquanto outras tiveram como partida de escolha o conteúdo programático ou tipo de intervenção e, assim, pode ser que ofereçam diferentes abordagens frente a semelhantes problemas. O trabalho está estruturado em duas partes. A primeira, mais
sucinta, faz uma breve apresentação dos arquitetos. A segunda, mais densa, discrimina cada obra dentro do contexto dos temas.This dissertation was developed from the reading of the book "Architecture Words 2: AntiObject" by Kengo Kuma. In it, the author elaborates, from seven design themes, a concept opposed to the type of architecture that he considers coercive and arbitrary. Each theme is theoretically conceptualized and exemplified with a project selected by the author. The purpose of the work is to analyze each of the seven themes on a case-by-case basis and identify project tools and mechanisms. The projects presented are placed in parallel with the architect Lina Bo Bardi and then characteristics of affinity or disparity between them are observed. Some choices of the works for the parallel were based on similarities with the project theme that Kuma presents, while others had as a starting point the program content or type of intervention and, thus, they may offer different approaches to similar problems. The work is structured in two
parts. The first, more succinct, makes a brief presentation of the architects. The second, denser, discriminates each work within the context of one of the themes
Empathetic marketing
No full textThesis: M.B.A., Massachusetts Institute of Technology, Sloan School of Management, 2016.Cataloged from PDF version of thesis.Includes bibliographical references (pages 96-97).Social media plays a large role in marketing strategy for transmitting and exchanging information between companies and consumers. Even for a traditional industry such as banking, social media has become an important and necessary tool for the marketing process. Although regulators have created formal guidelines to ensure financial institutions realize and manage the risk in using social media, many creative marketing approaches relating to social media has been incorporated by players in the financial industry. This thesis analyzes different types of marketing approaches using social media that is employed by financial institutions in the United States and in Japan. The thesis also explores the effects of marketing approaches using storytelling content. A marketing survey was conducted in Japan to evaluate whether storytelling is more effective when authored by a company or by a consumer. A regional Japanese bank, Suruga Bank, cooperated with this study and research by providing source material for the study content that was developed. The concept was to have a consumer share stories about financial services experiences in an effort to provide convincing information that Suruga Bank is a trusted supplier of loans and should be high on other consumers' consideration list. The design included a test of the feasibility of storytelling in multiple channels to evaluate the impact of each treatment. The results of the survey helped me to assess Suruga Bank's current marketing strategy and its corporate structure better. The ultimate goal of this thesis is to make strategic recommendations for Suruga Bank to reinforce its viral marketing strategy and strengthen its corporate communications skills via social media in order to leverage its organizational capabilities. Note: The views expressed in this thesis are those of the author and do not reflect the views of Suruga Bank.by Kengo Suzuki.M.B.A
Construction of low-wettable free-standing layer-by-layer multilayer for fibrinogen adsorption
No full textInternational audienc
Parallel Iterative Solvers for Ill-conditioned Problems with Heterogeneous Material Properties
No full textAbstractThe efficiency and robustness of preconditioned parallel iterative solvers, based on domain decomposition for ill-conditioned problems with heterogeneous material properties, are evaluated in the present work. The preconditioning method is based on the BILUT(p,d,t) method proposed by the author in a previous study, and two types of domain decomposition procedures, LBJ (Localized Block Jacobi) and HID (Hierarchical Interface Decomposition), are considered. The proposed methods are implemented using the Hetero3D code, which is a parallel finite-element benchmark program for solid mechanics problems, and the code provides excellent scalability and robustness on up to 240 nodes (3,840 cores) of the Fujitsu PRIMEHPC FX10 (Oakleaf-FX) at the Information Technology Center, the University of Tokyo. Generally, HID provides better efficiency and robustness than LBJ for a wide range of values of parameters
High-dimensional scaling limits of piecewise deterministic sampling algorithms
No full textPiecewise deterministic Markov processes are an important new tool in the design of Markov chain Monte Carlo algorithms. Two examples of fundamental importance are the bouncy particle sampler (BPS) and the zig–zag process (ZZ). In this paper scaling limits for both algorithms are determined. Here the dimensionality of the space tends towards infinity and the target distribution is the multivariate standard normal distribution. For several quantities of interest (angular momentum, first coordinate and negative log-density) the scaling limits show qualitatively very different and rich behaviour. Based on these scaling limits the performance of the two algorithms in high dimensions can be compared. Although for angular momentum both processes require only a computational effort of O(d) to obtain approximately independent samples, the computational effort for negative log-density and first coordinate differ: for these BPS requires O(d2) computational effort whereas ZZ requires O(d). Finally we provide a criterion for the choice of the refreshment rate of BPS.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Statistic
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