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Search Results: 1 - 10 of 4575 matches for " Hiroshi Gunji "
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The Panzar-Rosse Statistic Revisited  [PDF]
Hiroshi Gunji, Yuan Yuan
Theoretical Economics Letters (TEL) , 2017, DOI: 10.4236/tel.2017.71004
Abstract: In this note, we prove that even if the technology of firms exhibits increasing returns to scale, the Panzar-Rosse statistic in a monopolistic competitive market is still available and has a negative value. Further, we show that the statistic would be greater than unity if firms with increasing-returns-to-scale technology were to choose a saddle point under certain conditions. This implies that the value of greater than unity is not actually observed.
Centrality Dependence of $J/ψ$ Production in Au+Au and Cu+Cu Collisions by the PHENIX Experiment at RHIC
Taku Gunji
Physics , 2007, DOI: 10.1088/0954-3899/34/8/S88
Abstract: $J/\psi$ production has been measured in Au+Au and Cu+Cu collisions at $\sqrt{s_{NN}}$ = 200 GeV by the PHENIX experiment at the Relativistic Heavy Ion Collider (RHIC) during 2004 and 2005, respectively, at mid-rapidity ($|\eta| \le$ 0.35) via $J/\psi$ $\to$ $e^{+}e^{-}$ decay and at forward rapidity (1.2 $\le | \eta | \le$ 2.2) via $J/\psi$ $\to$ $\mu^{+}\mu^{-}$ decay. The nuclear modification factor ($R_{AA}$) of $J/\psi$ is presented as a function of the collision centrality for Au+Au collisions (final results) and Cu+Cu collisions (preliminary results) in both rapidity windows. These results are compared to SPS results at lower energy and to various theoretical calculations.
Loss of Parp-1 affects gene expression profile in a genome-wide manner in ES cells and liver cells
Hideki Ogino, Tadashige Nozaki, Akemi Gunji, Miho Maeda, Hiroshi Suzuki, Tsutomu Ohta, Yasufumi Murakami, Hitoshi Nakagama, Takashi Sugimura, Mitsuko Masutani
BMC Genomics , 2007, DOI: 10.1186/1471-2164-8-227
Abstract: In the article, we used six replicates of microarray data of wild-type ES cells for comparison with the microarray data of Parp-1 knockout ES cells. We found that three replicate data were carelessly included in the data for wild-type ES cells. The comparison should have been carried out between three replicates for the Parp-1+/+ ES cell line, J1, and three replicates for two Parp-1-/- ES cell lines, 210–58 and 226–47, respectively.Therefore, we re-analyzed the data in ES cells according to the same criteria. The consequences of this error are reflected in changes to our results although the conclusions we obtained in the study are not affected.Here, we demonstrate that of the 9,640 genes analyzed, in Parp-1-/- ES cells. 3.6% showed altered gene expression. Of these, 2.5% and 1.1% of the genes were down- or up-regulated by 2-fold or greater, respectively, compared with Parp-1+/+ ES cells (p < 0.05).A comparison of the basal gene expression profiles in Parp-1-/-EScells to their wild-type (Parp-1+/+) counterparts, is presented in Fig. 1A &1B (corrected) and Table 1 (corrected). We found the expression of (344/9,640) genes, namely 3.6%, was different by at least 2-fold between Parp-1-/-and Parp-1+/+ES cells (p < 0.05) (Fig. 1B (corrected) and Table 1 (corrected)). Notably, a larger fraction of the genes, being 2.5%(238/9,640), was down-regulated, whereas only 1.1% (106/9,640) of the genes were up-regulated (see Table 1 (corrected)).We also made the heatmaps using the gene lists containing the 893 genes that showed a difference at p < 0.05 in ES cells (Fig. 2A (corrected)). Although we used independently isolated Parp-1-/- ES cell clones, a clear and common alteration in the gene expression profile was observed (see Fig. 2A (corrected), and Tables 2 (corrected) and 3 (corrected)).We further selected the genes that showed relatively high expression levels (the "Flag value" in GeneSpring ver. 6.1 of the genes should be either "Present" (high level of expression) or "Margi
Loss of Parp-1 affects gene expression profile in a genome-wide manner in ES cells and liver cells
Hideki Ogino, Tadashige Nozaki, Akemi Gunji, Miho Maeda, Hiroshi Suzuki, Tsutomu Ohta, Yasufumi Murakami, Hitoshi Nakagama, Takashi Sugimura, Mitsuko Masutani
BMC Genomics , 2007, DOI: 10.1186/1471-2164-8-41
Abstract: We employed a microarray analysis covering 12,488 genes and ESTs using mouse Parp-1-deficient (Parp-1-/-) embryonic stem (ES) cell lines and the livers of Parp-1-/- mice and their wild-type (Parp-1+/+) counterparts. Here, we demonstrate that of the 9,907 genes analyzed, in Parp-1-/- ES cells, 9.6% showed altered gene expression. Of these, 6.3% and 3.3% of the genes were down- or up-regulated by 2-fold or greater, respectively, compared with Parp-1+/+ ES cells (p < 0.05). In the livers of Parp-1-/- mice, of the 12,353 genes that were analyzed, 2.0% or 1.3% were down- and up-regulated, respectively (p < 0.05). Notably, the number of down-regulated genes was higher in both ES cells and livers, than that of the up-regulated genes. The genes that showed altered expression in ES cells or in the livers are ascribed to various cellular processes, including metabolism, signal transduction, cell cycle control and transcription. We also observed expression of the genes involved in the pathway of extraembryonic tissue development is augmented in Parp-1-/- ES cells, including H19. After withdrawal of leukemia inhibitory factor, expression of H19 as well as other trophoblast marker genes were further up-regulated in Parp-1-/- ES cells compared to Parp-1+/+ ES cells.These results suggest that Parp-1 is required to maintain transcriptional regulation of a wide variety of genes on a genome-wide scale. The gene expression profiles in Parp-1-deficient cells may be useful to delineate the functional role of Parp-1 in epigenetic regulation of the genomes involved in various biological phenomena.Poly(ADP-ribose) polymerase-1 (Parp-1) is a nuclear protein that catalyzes the transfer of ADP-ribose units to various nuclear proteins as a post-translational modification [1]. Poly (ADP-ribose) is a highly negatively charged molecule and poly (ADP-ribosylation) of chromatin-bound proteins including histone may change the interaction of the modified proteins with DNA or other proteins. A 'histon
Self-Organized Criticality in Asynchronously Tuned Elementary Cellular Automata
Yukio-Pegio Gunji
Physics , 2013,
Abstract: Self-organized criticality (SOC) reveals a mechanism by which a system is autonomously evolved to be in a critical state without needing parameter tuning. Whereas various biological systems are found to be in critical states and the significance of SOC is being re-estimated, a simple model in a general platform has not been established. Here, we present SOC in asynchronously tuned elementary cellular automata (ECA), which was based on asynchronously updating and tuning the consistency between local dual modes of transitions. This duality was defined by adjunction, which can be ignored during synchronous updates. Duality coupled with asynchronous updating can demonstrate that SOC coincides with the criticality in a phase transition of asynchronous ECA with respect to density decay.
Future Upgrade and Physics Perspectives of the ALICE TPC
Taku Gunji,for the ALICE Collaboration
Physics , 2014, DOI: 10.1016/j.nuclphysa.2014.08.027
Abstract: The ALICE experiment at the Large Hadron Collider (LHC) proposes major detector upgrades to fully exploit the increase of the luminosity of the LHC in RUN~3 and to extend the physics reach for rare probes at low transverse momentum. The Time Projection Chamber (TPC) is one of the main tracking and PID devices in the central barrel of ALICE. The maximum trigger rate of the TPC is currently limited to about 3.5 kHz by the operation of a gating grid system. In order to make full use of the luminosity in RUN 3, the TPC is foreseen to be operated in an ungated mode with continuous readout. The existing MWPC readout will be replaced by a Micro-Pattern Gaseous Detector (MPGD) based readout, which provides intrinsic ion capture capability without gating. Extensive detector R\&D employing Gas Electron Multiplier (GEM) and Micro-Mesh Gaseous detector (Micromegas) technologies, and simulation studies to advance the techniques for the corrections of space-charge distortions have been performed since 2012. In this paper, the expected detector performance and the status of the R\&D program to achieve this ambitious goal are described.
Attenuation Effect of Expansion Configuration and Acoustic Material on Propagation of Blast Waves in a Duct  [PDF]
Motonobu Ishiguro, Kenji Shinkai, Ryo Shimamura, Hironobu Gunji, Yoko Takakura
Journal of Flow Control, Measurement & Visualization (JFCMV) , 2016, DOI: 10.4236/jfcmv.2016.43008
Abstract: With recent increase of cars, the noise problem has been caused by the exhaust sounds released from exhaust pipes, which consist of weak and pulsed shock waves called blast waves. To diminish the noise, a silencer is set up in front of the exhaust pipe. In the present study, reflectors were installed in the high-pressure section of the shock tube to generate blast waves, and three types of expansion region were investigated, combined with acoustic material of glass wool. The pressure decay was evaluated by transmission factor and reflection factor for the incident blast wave, together with pressure histories and high-speed Schlieren photography. As results, it was confirmed that the acoustic material greatly contributed to blast-wave attenuation: the one stage expansion model with glass wool recorded the highest decay of the peak over pressure for transmission, and other models with glass wool showed the second highest. The acoustic material also contributed to decay of reflected shock waves propagating toward an upstream duct.
Behaviour of Ru(bpy)2+3 on the Surface of Water-Soluble Single-Walled Carbon Nanotubes on Adding Other Cations  [PDF]
Hiroshi Shioyama
Journal of Surface Engineered Materials and Advanced Technology (JSEMAT) , 2012, DOI: 10.4236/jsemat.2012.22015
Abstract: Behaviour of excited Ru(bpy)2+3 bound to the surface of water-soluble single-walled carbon nanotubes on addition of other cations have been investigated by measuring Ru(bpy) luminescence. In contrast to what was observed with a solution containing rod-like aggregation particles of Nafion, we found that Ru(bpy)2+3 has a stronger attraction than that of other cations to the sulfonic groups on the carbon nanotubes. Such a difference is attributed to the unique micro-environmental characteristics of the molecular assemblies.
Extension of Smoothed Particle Hydrodynamics (SPH), Mathematical Background of Vortex Blob Method (VBM) and Moving Particle Semi-Implicit (MPS)  [PDF]
Hiroshi Isshiki
American Journal of Computational Mathematics (AJCM) , 2014, DOI: 10.4236/ajcm.2014.45036
Abstract: SPH has a reasonable mathematical background. Although VBM and MPS are similar to SPH, their ma-thematical backgrounds seem fragile. VBM has some problems in treating the viscous diffusion of vortices but is known as a practical method for calculating viscous flows. The mathematical background of MPS is also not sufficient. Not with standing, the numerical results seem reasonable in many cases. The problem common in both VBM and MPS is that the space derivatives necessary for calculating viscous diffusion are not estimated reasonably, although the treatment of advection is mathematically correct. This paper discusses a method to estimate the above mentioned problem of how to treat the space derivatives. The numerical results show the comparison among FDM (Finite Difference Method), SPH and MPS in detail. In some cases, there are big differences among them. An extension of SPH is also given.
The Effective Chiral Model of Quantum Hadrodynamics Applied to Nuclear Matter and Neutron Stars  [PDF]
Hiroshi Uechi
Journal of Applied Mathematics and Physics (JAMP) , 2015, DOI: 10.4236/jamp.2015.32017

We review theoretical relations between macroscopic properties of neutron stars and microscopic quantities of nuclear matter, such as consistency of hadronic nuclear models and observed masses of neutron stars. The relativistic hadronic field theory, quantum hadrodynamics (QHD), and mean-field approximations of the theory are applied to saturation properties of symmetric nuclear and neutron matter. The equivalence between mean-field approximations and Hartree approximation is emphasized in terms of renormalized effective masses and effective coupling constants of hadrons. This is important to prove that the direct application of mean-field (Hartree) approximation to nuclear and neutron matter is inadequate to examine physical observables. The equations of state (EOS), binding energies of nuclear matter, self-consistency of nuclear matter, are reviewed, and the result of chiral Hartree-Fock \"\"approximation is shown. Neutron stars and history of nuclear astrophysics, nuclear model and nuclear matter, possibility of hadron and hadron-quark neutron stars are briefly reviewed. The hadronic models are very useful and practical for understanding astrophysical phenomena, nuclear

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