268,657 research outputs found
Quantum dynamics of ultrafast charge transfer at an oligothiophene-fullerene heterojunction
No full textFollowing up on our recent study of ultrafast charge separation at oligothiophene-fullerene interfaces [H. Tamura, I. Burghardt, and M. Tsukada, J. Phys. Chem. C 115, 10205 (2011)10.1021/jp203174e], we present here a detailed quantum dynamical perspective on the charge transfer process. To this end, electron-phonon coupling is included non-perturbatively, by an explicit quantum dynamical treatment using the multi-configuration time-dependent Hartree (MCTDH) method. Based upon a distribution of electron-phonon couplings determined from electronic structure studies, a spectral density is constructed and employed to parametrize a linear vibronic coupling Hamiltonian. The diabatic coupling is found to depend noticeably on the inter-fragment distance, whose effect on the dynamics is here investigated. MCTDH calculations of the nonadiabatic transfer dynamics are carried out for the two most relevant electronic states and 60 phonon modes. The electron transfer process is found to be ultrafast and mediated by electronic coherence, resulting in characteristic oscillatory features during a period of about 100 fs
Non-Markovian reduced dynamics of ultrafast charge transfer at an oligothiophene–fullerene heterojunction
No full textWe extend our recent quantum dynamical study of the exciton dissociation and charge transfer at an oligothiophene–fullerene heterojunction interface (Tamura et al., 2012) [6] by investigating the process using the non-perturbative hierarchical equations of motion (HEOM) approach. Based upon an effective mode reconstruction of the spectral density the effect of temperature on the charge transfer is studied using reduced density matrices. It was found that the temperature had little effect on the charge transfer and a coherent dynamics persists over the first few tens of femtoseconds, indicating that the primary charge transfer step proceeds by an activationless pathway
Fizesereneia Takeda & Tamura 1980
No full textGenus <i>Fizesereneia</i> Takeda & Tamura, 1980 <p> <i>Fizesereneia</i> Takeda & Tamura, 1980: 137</p> <p> <i>Fizeserenia</i> —Kropp & Manning, 1987: 2 [erroneous spelling]</p> <p> <b>Type species.</b> <i>Troglocarcinus heimi</i> Fize & Serène, 1956, subsequent designation by Kropp (1990b) <b>Type locality.</b> Nha Trang, Vietnam</p> <p> <b>Remarks.</b> The genus <i>Fizesereneia</i> presently includes six species: <i>Fizesereneia heimi</i> (Fize & Serène, 1956), <i>F</i>. <i>stimpsoni</i> (Fize & Serène, 1956), <i>F</i>. <i>ishikawai</i> Takeda & Tamura, 1980, <i>F</i>. <i>latisella</i> Kropp, 1994, <i>F</i>. <i>tholia</i> Kropp, 1994, and the recently described <i>F</i>. <i>daidai</i> Zayasu, 2013. The location of the holotypes of <i>Troglocarcinus heimi</i> and <i>T</i>. <i>stimpsoni</i> are unknown according to Kropp (1990a). The holotypes of the other <i>Fizesereneia</i> species are available in the collections of the National Museum of Nature and Science, Tokyo (<i>F</i>. <i>ishikawai</i>, <i>F</i>. <i>daidai</i>), the National Museum of Natural History, Smithsonian Institution, Washington D.C. (<i>F</i>. <i>latisella</i>), and the Muséum national d'Histoire naturelle, Paris (<i>F</i>. <i>tholia</i>).</p>Published as part of <i>Van Der Meij, Sancia E. T., Berumen, Michael L. & Paulay, Gustav, 2015, A new species of Fizesereneia Takeda & Tamura, 1980 (Crustacea: Brachyura: Cryptochiridae) from the Red Sea and Oman, pp. 585-595 in Zootaxa 3931 (4)</i> on page 586, DOI: 10.11646/zootaxa.3931.4.8, <a href="http://zenodo.org/record/240107">http://zenodo.org/record/240107</a>
Kira Kira ‘Bright Force’ Australia/New Zealand Tour 2018: Canberra
No full textThis performance took place during a tour by Alister Spence, Satoko Fujii, and Natsuki Tamura to promote the release of their CD recording 'Bright Force' (Libra records).
This performance was a demonstration of the research in music composition and performance undertaken by Dr Alister Spence from UNSW, and musician colleagues, Satoko Fujii and Natsuki Tamura from Japan, performing the 'Bright Force' work together as the Kira Kira project. This research investigates the agency of contingency in intercultural, inter-genre, music making, and the continuum between composition and improvisation. (What I have termed the Experimental Composition, Improvisation Continuum or ECIC.
Evolutionary relationships between <i>Bactocera invadens</i> populations, <i>B. dorsalis s.s</i> and <i>B. kandiensis</i> as inferred using Neighbour-Joining method by Mega 5 program (Tamura <i>et al.</i>, 2011).
No full text<p>Evolutionary relationships between <i>Bactocera invadens</i> populations, <i>B. dorsalis s.s</i> and <i>B. kandiensis</i> as inferred using Neighbour-Joining method by Mega 5 program (Tamura <i>et al.</i>, 2011).</p
Firms’ Investment Strategies and the Choice of Foreign Direct Investment
No full textIn this paper, I examine firms\u27 choice to undertake foreign direct investment (FDI) using the theoretical framework of Antras and Helpman [2004]. I clarify that more headquarter-intensive firms choose to undertake FDI, whereas less headquarter-intensive firms choose outsourcing. I use the strategic types of Miles and Snow to examine firm heterogeneity. Using the analyses of mail surveys of Japanese manufacturing firms in Shimizu and Tamura [2010] and Shimizu and Tamura [2013], I find that prospectors are more headquarter intensive than defenders, whereas analyzers fall in between these types. Thus, prospectors may choose to undertake FDI more than do defenders. From the mail survey of Shimizu and Ando [2011], prospectors perform FDI more aggressively than defenders, which is consistent with the theoretical analysis
Glucose and Glucuronate 2, 2, 2-Trichloroethyl Sulfates: Precursors for Multiply Sulfated Oligosaccharides
No full textEvolutionary relationships between <i>B. invadens</i> populations and other <i>Bactrocera</i> species included in the study as inferred using Neighbour-Joining method by Mega 5 program (Tamura <i>et al.</i>, 2011).
No full text<p>Evolutionary relationships between <i>B. invadens</i> populations and other <i>Bactrocera</i> species included in the study as inferred using Neighbour-Joining method by Mega 5 program (Tamura <i>et al.</i>, 2011).</p
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
Between-group genetic distances of the “A”-groups of <i>Chydorus</i> for the <i>ITS-2</i> gene (Kimura 2-parameter) and <i>COI</i> gene (Tamura 3-parameter).
No full textBetween-group genetic distances of the “A”-groups of Chydorus for the ITS-2 gene (Kimura 2-parameter) and COI gene (Tamura 3-parameter).</p
- …
