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406 results on '"A, Wakikawa"'

3. Sonoluminescence intensity and ultrasonic cavitation temperature in organic solvents: Effects of generated radicals

Author

Ben Nanzai, Akimitsu Mochizuki, Yusuke Wakikawa, Yusuke Masuda, Tadashi Oshio, and Kazuhiro Yagishita

Subjects
Methyl radicals, Methyl radial recombination method, Electron spin resonance, Vapor pressure, Viscosity, Surface tension, Chemistry, QD1-999, Acoustics. Sound, QC221-246
Abstract

Ultrasonic cavitation in organic solvents remains poorly understood in contrast with aqueous systems, largely because of complexities related to solvent decomposition. In this study, we sonicated different types of organic solvents (i.e. linear alkanes, aliphatic alcohols, aromatic alcohols, and acetate esters) under argon saturation. The average temperature of the cavitation bubbles was estimated using the methyl radical recombination method. We also discuss the effects of the physical properties of the solvents, such as vapor pressure and viscosity, on the cavitation temperature. The average cavitation bubble temperature and sonoluminescence intensity were higher in organic solvents with lower vapor pressure; for aromatic alcohols, these values were particularly high. It was found that the specific high sonoluminescence intensities and average cavitation temperatures exhibited in aromatic alcohols are caused by the highly resonance-stable generated radicals. The results obtained in this study are very useful for acceleration of sonochemical reaction in organic solvents, which are indispensable for organic synthesis and material synthesis.

Published
2023
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4. Vehicular Inter-Networking via Named Data

Author

Grassi, Giulio, Pesavento, Davide, Wang, Lucas, Pau, Giovanni, Vuyyuru, Rama, Wakikawa, Ryuji, and Zhang, Lixia

Subjects
Computer Science - Networking and Internet Architecture
Abstract

In this paper we apply the Named Data Networking, a newly proposed Internet architecture, to networking vehicles on the run. Our initial design, dubbed V-NDN, illustrates NDN's promising potential in providing a unifying architecture that enables networking among all computing devices independent from whether they are connected through wired infrastructure, ad hoc, or intermittent DTN. This paper describes the prototype implementation of V-NDN and its preliminary performance assessment.

Published
2013

14. Cp*Rh-III/Chiral Disulfonate/CuOAc Catalyst System for the Enantioselective Intramolecular Oxyamination of Alkenes

Author

Hirose, Jumpei, Wakikawa, Takumi, Satake, Shun, Kojima, Masahiro, Hatano, Manabu, Ishihara, Kazuaki, Yoshino, Tatsuhiko, and Matsunaga, Shigeki

Subjects
chiral anion, rhodium catalysis, asymmetric catalysis, tetrahydrofuran, oxyamination
Abstract

The enantioselective intramolecular oxyamination of unsaturated alkoxyamines using a hybrid catalytic system consisting of Cp*Rh-III/chiral disulfonate/CuOAc is described. Tetrahydrofuran derivatives with a tetrasubstituted chiral center were obtained under the optimized conditions in 91:9-97:3 er. The use of a sterically hindered chiral disulfonate and a Cu additive was essential for the high enantioselectivity.

Published
2021

16. Radiowave Effects on an Electron–Hole Pair in a Poly(3-hexylthiophene) near Zero Magnetic Field

Author

Yusuke Wakikawa and Tadaaki Ikoma

Subjects
General Energy, Materials science, Condensed matter physics, Zero (complex analysis), Electron hole, Physical and Theoretical Chemistry, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Radio wave, Magnetic field
Abstract

To clarify the dynamics of an electron–hole (e–h) pair, which plays an important role in the performance of optoelectronic devices, the radiowave effect on photoconduction in a regioregular poly(3-...

Published
2021
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32. Extending Home Agent Migration to Mobile IPv6 Based Protocols

Author

Valadon, Guillaume, Wakikawa, Ryuji, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Fdida, Serge, editor, and Sugiura, Kazunori, editor

Published
2007
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35. MANET and NEMO Converged Communication

Author

Okada, Kouji, Wakikawa, Ryuji, Murai, Jun, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Cho, Kenjiro, editor, and Jacquet, Philippe, editor

Published
2006
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39. An Adaptive Application Flooding for Efficient Data Dissemination in Dense Ad-Hoc Networks

Author

Oyabu, Yuki, Wakikawa, Ryuji, Murai, Jun, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Cho, Kenjiro, editor, and Jacquet, Philippe, editor

Published
2005
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40. Mobile Gateways for Mobile Ad-Hoc Networks with Network Mobility Support

Author

Wakikawa, Ryuji, Matsutani, Hiroki, Koodli, Rajeev, Nilsson, Anders, Murai, Jun, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Lorenz, Pascal, editor, and Dini, Petre, editor

Published
2005
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43. Native Amide-Directed C(sp3)−H Amidation Enabled by Electron-Deficient RhIII Catalyst and Electron-Deficient 2-Pyridone Ligand

Author

Wakikawa, Takumi, Sekine, Daichi, Murata, Yuta, Bunno, Youka, 1000090824714, Kojima, Masahiro, Nagashima, Yuki, Tanaka, Ken, 1000050756179, Yoshino, Tatsuhiko, 1000050334339, Matsunaga, Shigeki, Wakikawa, Takumi, Sekine, Daichi, Murata, Yuta, Bunno, Youka, 1000090824714, Kojima, Masahiro, Nagashima, Yuki, Tanaka, Ken, 1000050756179, Yoshino, Tatsuhiko, 1000050334339, and Matsunaga, Shigeki

Abstract

Trivalent group-9 metal catalysts with a cyclopentadienyl-type ligand (CpMIII; M=Co, Rh, Ir, Cp=cyclopentadienyl) have been widely used for directed C-H functionalizations, albeit that their application to challenging C(sp(3))-H functionalizations suffers from the limitations of the available directing groups. In this report, we describe directed C(sp(3))-H amidation reactions of simple amide substrates with a variety of substituents. The combination of an electron-deficient (CpRh)-Rh-E catalyst (Cp-E=1,3-bis(ethoxycarbonyl)-substituted Cp) and an electron-deficient 2-pyridone ligand is essential for high reactivity.

Published
2022

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