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Search Results: 1 - 10 of 341022 matches for " R. H. Maruyama "
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The Aspergillus nidulans MAPK Module AnSte11-Ste50-Ste7-Fus3 Controls Development and Secondary Metabolism
?zgür Bayram,?zlem Sarikaya Bayram,Yasar Luqman Ahmed,Jun-ichi Maruyama,Oliver Valerius,Silvio O. Rizzoli,Ralf Ficner,Stefan Irniger ,Gerhard H. Braus
PLOS Genetics , 2012, DOI: 10.1371/journal.pgen.1002816
Abstract: The sexual Fus3 MAP kinase module of yeast is highly conserved in eukaryotes and transmits external signals from the plasma membrane to the nucleus. We show here that the module of the filamentous fungus Aspergillus nidulans (An) consists of the AnFus3 MAP kinase, the upstream kinases AnSte7 and AnSte11, and the AnSte50 adaptor. The fungal MAPK module controls the coordination of fungal development and secondary metabolite production. It lacks the membrane docking yeast Ste5 scaffold homolog; but, similar to yeast, the entire MAPK module's proteins interact with each other at the plasma membrane. AnFus3 is the only subunit with the potential to enter the nucleus from the nuclear envelope. AnFus3 interacts with the conserved nuclear transcription factor AnSte12 to initiate sexual development and phosphorylates VeA, which is a major regulatory protein required for sexual development and coordinated secondary metabolite production. Our data suggest that not only Fus3, but even the entire MAPK module complex of four physically interacting proteins, can migrate from plasma membrane to nuclear envelope.
The low-temperature energy calibration system for the CUORE bolometer array
S. Sangiorgio,L. M. Ejzak,K. M. Heeger,R. H. Maruyama,A. Nucciotti,M. Olcese,T. S. Wise,A. L. Woodcraft
Physics , 2009, DOI: 10.1063/1.3292432
Abstract: The CUORE experiment will search for neutrinoless double beta decay (0nDBD) of 130Te using an array of 988 TeO_2 bolometers operated at 10 mK in the Laboratori Nazionali del Gran Sasso (Italy). The detector is housed in a large cryogen-free cryostat cooled by pulse tubes and a high-power dilution refrigerator. The TeO_2 bolometers measure the event energies, and a precise and reliable energy calibration is critical for the successful identification of candidate 0nDBD and background events. The detector calibration system under development is based on the insertion of 12 gamma-sources that are able to move under their own weight through a set of guide tubes that route them from deployment boxes on the 300K flange down into position in the detector region inside the cryostat. The CUORE experiment poses stringent requirements on the maximum heat load on the cryostat, material radiopurity, contamination risk and the ability to fully retract the sources during normal data taking. Together with the integration into a unique cryostat, this requires careful design and unconventional solutions. We present the design, challenges, and expected performance of this low-temperature energy calibration system.
The Relation among the Solar Activity, the Total Ozone, QBO, NAO, and ENSO by Wavelet-Based Multifractal Analysis  [PDF]
Fumio Maruyama
Journal of Applied Mathematics and Physics (JAMP) , 2018, DOI: 10.4236/jamp.2018.66109
Abstract: There is an increasing interest in the relation between the solar activity and climate change. As for the solar activity, a fractal property of the sunspot number was studied by many works. In general, a fractal property was observed in the time series of dynamics of complex systems. The purposes of this study are to investigate the relations among the solar activity, total ozone, Quasi-Biennial Oscillation (QBO), the North Atlantic Oscillation (NAO), and El Ni?o-Southern Oscillation (ENSO) from a view of multi-fractality. To detect the changes of multifractality, we examined the multifractal analysis on the time series of the solar 10.7-cm radio flux (F10.7 flux), total ozone, QBO, NAO, and Ni?o3.4 indices. During the period 1950 and 2010, for the F10.7 flux and QBO index, the matching in monofractality or multifractality is observed and the increase and decrease of multifractality is similar; that is the change of multifractality is similar. In the same way, it is very similar, during the period 1985 and 2010, for the QBO and the total ozone, and during the period 1950 and 2010, for the QBO, and NAO and for the QBO, and Ni?o3.4. Compared to Ni?o3.4, the multifractality of NAO and QBO was strong and it turns out that they are undergoing unstable change.
Relationship between the Atmospheric CO2 and Climate Indices by Wavelet-Based Multifractal Analysis  [PDF]
Fumio Maruyama
Journal of Geoscience and Environment Protection (GEP) , 2019, DOI: 10.4236/gep.2019.71004
Abstract: Atmospheric concentrations of greenhouse gases are rising, leading to a positive radiative forcing of climate and an expected warming of surface temperatures. In general, fractal properties may be observed in the time series of the dynamics of complex systems. To study the relation between the atmospheric CO2 concentration and the climate indices, we investigated the change of fractal behavior of the CO2, the carbon isotope ratio (δ13C) of atmospheric CO2, the El Ni?o-Southern Oscillation (ENSO), the Pacific Decadal Oscillation (PDO), and the North Atlantic Oscillation (NAO) indices using the multifractal analysis. When the atmospheric CO2 growth rate was large, the multifractality of CO2, δ13C in CO2, ENSO, and NAO was large and the changes were large from the change of fractality. The changes of CO2 and ENSO were closely related and the influence of the CO2 on the ENSO was strong from the change in fractality and wavelet coherence. When the El Ni?o occurred, the CO2 growth rate was large. The CO2 related to PDO, NAO, and global temperature from the change in fractality and wavelet coherence. Especially, the changes of CO2 and global temperature were closely related. When the global warming hiatus occurred, the multifractality of the global temperature was weaker than that of CO2 and the change of the global temperature was stable. These findings will contribute to the research of the relation between the atmospheric CO2 and climate change.
Relationship between the Sunspot Number and Solar Polar Field by Wavelet-Based Multifractal Analysis  [PDF]
Fumio Maruyama
Journal of Applied Mathematics and Physics (JAMP) , 2019, DOI: 10.4236/jamp.2019.75070
There is increasing interest in finding the relation between the sunspot number (SSN) and solar polar field. In general, fractal properties may be observed in the time series of the dynamics of complex systems, such as solar activity and climate. This study investigated the relations between the SSN and solar polar field by performing a multifractal analysis. To investigate the change in multifractality, we applied a wavelet transform to time series. When the SSN was maximum and minimum, the SSN showed monofractality or weak multifractality. The solar polar field showed weak multifractality when that was maximum and minimum. When the SSN became maximum, the fractality of the SSN changed from multifractality to monofractality. The multifractality of SSN became large before two years of SSN maximum, then that of the solar polar field became large and changed largely. It was found that the change in SSN triggered the change in the solar polar field. Hence, the SSN and solar polar field were closely correlated from the view point of fractals. When the maximum solar polar field before the maximum SSN was larger, the maximum SSN of the next cycle was larger. The formation of the magnetic field of the sunspots was correlated with the solar polar field.
High-precision CTE measurement of hybrid C/SiC composite for cryogenic space telescopes
K. Enya,N. Yamada,T. Imai,Y. Tange,H. Kaneda,H. Katayama,M. Kotani,K. Maruyama,M. Naitoh,T. Nakagawa,T. Onaka,M. Suganuma,T. Ozaki,M. Kume,M. R. Krodel
Physics , 2011, DOI: 10.1016/j.cryogenics.2011.10.004
Abstract: This paper presents highly precise measurements of thermal expansion of a "hybrid" carbon-fiber reinforced silicon carbide composite, HB-Cesic\textregistered - a trademark of ECM, in the temperature region of \sim310-10K. Whilst C/SiC composites have been considered to be promising for the mirrors and other structures of space-borne cryogenic telescopes, the anisotropic thermal expansion has been a potential disadvantage of this material. HB-Cesic\textregistered is a newly developed composite using a mixture of different types of chopped, short carbon-fiber, in which one of the important aims of the development was to reduce the anisotropy. The measurements indicate that the anisotropy was much reduced down to 4% as a result of hybridization. The thermal expansion data obtained are presented as functions of temperature using eighth-order polynomials separately for the horizontal (XY-) and vertical (Z-) directions of the fabrication process. The average CTEs and their dispersion (1{\sigma}) in the range 293-10K derived from the data for the XY- and Z-directions were 0.805$\pm$0.003\times10$^{-6}$ K$^{-1}$ and 0.837\pm0.001\times10$^{-6}$ K$^{-1}$, respectively. The absolute accuracy and the reproducibility of the present measurements are suggested to be better than 0.01\times10$^{-6}$ K$^{-1}$ and 0.001\times(10)^{-6} K^{-1}, respectively. The residual anisotropy of the thermal expansion was consistent with our previous speculation regarding carbon-fiber, in which the residual anisotropy tended to lie mainly in the horizontal plane.
Time-Dependent Dynamics of the Bose-Fermi Mixed Condensed System
T. Maruyama,H. Yabu,T. Suzuki
Physics , 2003,
Abstract: We study the monopole oscillation in the bose-fermi mixed condensed system by performing the time-dependent Gross-Pitaevsky (GP) and Vlasov equations. We find that the big damping exists for the fermion oscillation in the mixed system even at zero temperature
Linear plasmon dispersion in single-wall carbon nanotubes and the collective excitation spectrum of graphene
C. Kramberger,R. Hambach,C. Giorgetti,M. H. Rummeli,M. Knupfer,J. Fink,B. Buchner,L. Reining,E. Einarsson,S. Maruyama,F. Sottile,K. Hannewald,V. Olevano,A. G. Marinopoulos,T. Pichler
Physics , 2008, DOI: 10.1103/PhysRevLett.100.196803
Abstract: We have measured a strictly linear pi-plasmon dispersion along the axis of individualized single wall carbon nanotubes, which is completely different from plasmon dispersions of graphite or bundled single wall carbon nanotubes. Comparative ab initio studies on graphene based systems allow us to reproduce the different dispersions. This suggests that individualized nanotubes provide viable experimental access to collective electronic excitations of graphene, and it validates the use of graphene to understand electronic excitations of carbon nanotubes. In particular, the calculations reveal that local field effects (LFE) cause a mixing of electronic transitions, including the 'Dirac cone', resulting in the observed linear dispersion.
Proposal: A Search for Sterile Neutrino at J-PARC Materials and Life Science Experimental Facility
M. Harada,S. Hasegawa,Y. Kasugai,S. Meigo,K. Sakai,S. Sakamoto,K. Suzuya,E. Iwai,T. Maruyama,K. Nishikawa,R. Ohta,M. Niiyama,S. Ajimura,T. Hiraiwa,T. Nakano,M. Nomachi,T. Shima,T. J. C. Bezerra,E. Chauveau,T. Enomoto,H. Furuta,H. Sakai,F. Suekane,M. Yeh,G. T. Garvey,W. C. Louis,G. B. Mills,R. Van de Water
Physics , 2013,
Abstract: We propose a definite search for sterile neutrinos at the J-PARC Materials and Life Science Experimental Facility (MLF). With the 3 GeV Rapid Cycling Synchrotron (RCS) and spallation neutron target, an intense neutrino beam from muon decay at rest (DAR) is available. Neutrinos come from \mu+ decay, and the oscillation to be searched for is (anti \nu \mu -> anti \nu e) which is detected by the inverse \beta decay interaction (anti \nu e + p -> e+ + n), followed by a gamma from neutron capture. The unique features of the proposed experiment, compared with the LSND and experiments using horn focused beams, are; (1) The pulsed beam with about 600 ns spill width from J-PARC RCS and muon long lifetime allow us to select neutrinos from \mu DAR only. (2) Due to nuclear absorption of \pi- and \mu-, neutrinos from \mu- decay are suppressed to about the $10^{-3}$ level. (3) Neutrino cross sections are well known. The inverse \beta decay cross section is known to be a few percent accuracy. (4) The neutrino energy can be calculated from positron energy by adding ~1.8 MeV. (5) The anti \nu \mu and \nu e fluxes have different and well defined spectra. This allows us to separate oscillated signals from those due to \mu- decay contamination. We propose to proceed with the oscillation search in steps since the region of \Delta m^2 to be searched can be anywhere between sub-eV^2 to several tens of eV^2. We start to examine the large \Delta m^2 region, which can be done with short baseline at first. At close distance to the MLF target gives a high neutrino flux, and allows us to use relatively small detector. If no definitive positive signal is found, a future option exists to cover small \Delta m^2 region. This needs a relatively long baseline and requires a large detector to compensate for the reduced neutrino flux.
Probing the DeltaNN component of 3He
G. M. Huber,G. J. Lolos,E. J. Brash,S. Dumalski,F. Farzanpay,M. Iurescu,Z. Papandreou,A. Shinozaki,A. Weinerman,T. Emura,H. Hirosawa,K. Niwa,H. Yamashita,K. Maeda,T. Terasawa,H. Yamazaki,S. Endo,K. Miyamoto,Y. Sumi,G. Garino,K. Maruyama,A. Leone,R. Perrino,T. Maki,A. Sasaki,Y. Wada
Physics , 1999, DOI: 10.1103/PhysRevC.62.044001
Abstract: The 3He(gamma,pi^+/- p) reactions were measured simultaneously over a tagged photon energy range of 800
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