Institution
Waseda University
Education•Tokyo, Japan•
About: Waseda University is a education organization based out in Tokyo, Japan. It is known for research contribution in the topics: Large Hadron Collider & Catalysis. The organization has 24220 authors who have published 46859 publications receiving 837855 citations. The organization is also known as: Waseda daigaku & Sōdai.
Topics: Large Hadron Collider, Catalysis, Population, Robot, Humanoid robot
Papers published on a yearly basis
Papers
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TL;DR: In this paper, a buckling model of longitudinal rebars in corroded RC bridge piers was established, and a novel computational procedure to integrate the probabilistic hazard associated with airborne chlorides into life-cycle seismic reliability assessment of these piers is proposed.
Abstract: Over the last two decades, the probabilistic assessment of reinforced concrete (RC) structures under seismic hazard has been developed rapidly. However, little attention has been devoted to the assessment of the seismic reliability of corroded structures. For the life-cycle assessment of RC structures in a marine environment and earthquake-prone regions, the effect of corrosion due to airborne chlorides on the seismic capacity needs to be taken into consideration. Also, the effect of the type of corrosive environment on the seismic capacity of RC structures has to be quantified.
In this paper, the evaluation of the displacement ductility capacity based on the buckling model of longitudinal rebars in corroded RC bridge piers is established, and a novel computational procedure to integrate the probabilistic hazard associated with airborne chlorides into life-cycle seismic reliability assessment of these piers is proposed. The seismic demand depends on the results of seismic hazard assessment, whereas the deterioration of seismic capacity depends on the hazard associated with airborne chlorides. In an illustrative example, an RC bridge pier was modeled as single degree of freedom (SDOF). The longitudinal rebars buckling of this pier was considered as the sole limit state when estimating its failure probability. The findings show that the life-cycle reliability of RC bridge piers depends on both the seismic and airborne chloride hazards, and that the cumulative-time failure probabilities of RC bridge piers located in seismic zones can be dramatically affected by the effect of airborne chlorides. Copyright © 2011 John Wiley & Sons, Ltd.
161 citations
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TL;DR: Direct chemical techniques are applied to categorically demonstrate the preservation of eumelanin in two > 160 Ma Jurassic cephalopod ink sacs and to confirm its chemical similarity to the ink of the modern cepHalopod, Sepia officinalis.
Abstract: Melanin is a ubiquitous biological pigment found in bacteria, fungi, plants, and animals. It has a diverse range of ecological and biochemical functions, including display, evasion, photoprotection, detoxification, and metal scavenging. To date, evidence of melanin in fossil organisms has relied entirely on indirect morphological and chemical analyses. Here, we apply direct chemical techniques to categorically demonstrate the preservation of eumelanin in two > 160 Ma Jurassic cephalopod ink sacs and to confirm its chemical similarity to the ink of the modern cephalopod, Sepia officinalis. Identification and characterization of degradation-resistant melanin may provide insights into its diverse roles in ancient organisms.
161 citations
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TL;DR: Wu et al. as discussed by the authors prepared nanoporous carbon (NC) particles of approx-imately 50nm diameter by direct carbonization of metal-organic frameworks (MOFs) and obtained MOF-derived NC(MOF-NC), which exhibit very high biocompatibility and are promising as intracellular drug delivery carriers.
Abstract: Precursory Research for Embryon icSc ence and Technology (PRESTO), Japan Sc ogy Agency (JST),4-1-8 Honcho, Kawaguchi,Saitama 332-0012(E-mail: kevinwu@nimsgojp, YamauchiYusuke@nimsgojp)We prepared nanoporous carbon (NC) particles of approx-imately 50-nm diameter by direct carbonization of metalorganic frameworks (MOFs) The obtained MOF-derived NC(MOF-NC) particles exhibit very high biocompatibility and,hence, are promising as intracellular drug delivery carriersMany drug carriers, such as dendrimers, micelles, emul-sions, organicinorganic hybrids, nanoparticles, nanotubes, lip-osomes, metalorganic frameworks (MOFs), and hydrogels,have been proposed so far
160 citations
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TL;DR: In this article, an interpolymer complex was prepared by mixing aqueous solutions of poly(ethylene oxide) (PEO) and of a poly(carboxylic acid), i.e., poly(acrylic acid)(PAA), poly(methacric acrylic acid)(PMAA), or styrene-maleic acid copolymer(PSMA).
Abstract: An interpolymer complex was prepared by mixing aqueous solutions of poly(ethylene oxide) (PEO) and of a poly(carboxylic acid), i.e., poly(acrylic acid)(PAA), poly(methacrylic acid)(PMAA), or styrene-maleic acid copolymer(PSMA). The complexation mechanism was discussed on the basis of results of such experimental methods as viscosity, potentiometric titration, and turbidimetry. The hydrogen bond is primarily involved in these complexations, but the influence of hydrophobic interaction on complexation can not be ignored. If the degree of dissociation α of carboxylic acid or the degree of polymerization Pn of PEO was perceptibly changed, a stable complex was obtained at about α 0.1 or Pn(PEO) = 40 for PMAA, 200 for PAA. This fact indicates that more than a definite number of binding sites are necessary for a stable interpolymer complex to be formed and that cooperative interaction among active sites plays an important role in complex formation.
160 citations
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TL;DR: An overview of the core space–time FSI technique, its recent versions, and the special space– time FSI techniques are provided.
Abstract: Since its introduction in 1991 for computation of flow problems with moving boundaries and interfaces, the Deforming-Spatial-Domain/Stabilized Space–Time (DSD/SST) formulation has been applied to a diverse set of challenging problems. The classes of problems computed include free-surface and two-fluid flows, fluid–object, fluid–particle and fluid–structure interaction (FSI), and flows with mechanical components in fast, linear or rotational relative motion. The DSD/SST formulation, as a core technology, is being used for some of the most challenging FSI problems, including parachute modeling and arterial FSI. Versions of the DSD/SST formulation introduced in recent years serve as lower-cost alternatives. More recent variational multiscale (VMS) version, which is called DSD/SST-VMST (and also ST-VMS), has brought better computational accuracy and serves as a reliable turbulence model. Special space–time FSI techniques introduced for specific classes of problems, such as parachute modeling and arterial FSI, have increased the scope and accuracy of the FSI modeling in those classes of computations. This paper provides an overview of the core space–time FSI technique, its recent versions, and the special space–time FSI techniques. The paper includes test computations with the DSD/SST-VMST technique.
160 citations
Authors
Showing all 24378 results
Name | H-index | Papers | Citations |
---|---|---|---|
Yusuke Nakamura | 179 | 2076 | 160313 |
Yoshio Bando | 147 | 1234 | 80883 |
Charles Maguire | 142 | 1197 | 95026 |
Kazunori Kataoka | 138 | 908 | 70412 |
Senta Greene | 134 | 1346 | 90697 |
Intae Yu | 134 | 1372 | 89870 |
Kohei Yorita | 131 | 1389 | 91177 |
Wei Xie | 128 | 1281 | 77097 |
Susumu Kitagawa | 125 | 809 | 69594 |
Leon O. Chua | 122 | 824 | 71612 |
Jun Kataoka | 121 | 603 | 54274 |
S. Youssef | 120 | 683 | 65110 |
Katsuhiko Mikoshiba | 120 | 866 | 62394 |
Yusuke Yamauchi | 117 | 1000 | 51685 |
Teruo Okano | 117 | 476 | 47081 |