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Search Results: 1 - 10 of 287 matches for " Akito Arima "
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Clustering aspects and the shell model
Akito Arima
Physics , 2004, DOI: 10.1016/j.nuclphysa.2004.04.030
Abstract: In this talk I shall discuss the clustering aspect and the shell model. I shall first discuss the $\alpha$-cluster aspects based on the shell model calculations. Then I shall discuss the spin zero ground state dominance in the presence of random interactions and a new type of cluster structure for fermions in a single-$j$ shell in the presence of only pairing interaction with the largest multiplicity.
On the test of the modified BCS at finite temperature
Nguyen Dinh Dang,Akito Arima
Physics , 2005, DOI: 10.1103/PhysRevC.74.059801
Abstract: The results and conclusions by Ponomarev and Vdovin [Phys. Rev. C {\bf 72}, 034309 (2005)] are inadequate to judge the applicability of the modified BCS because they were obtained either in the temperature region, where the use of zero-temperature single-particle spectra is no longer justified, or in too limited configuration spaces.
Pairing effect on the giant dipole resonance width at low temperature
Nguyen Dinh Dang,Akito Arima
Physics , 2003, DOI: 10.1103/PhysRevC.68.044303
Abstract: The width of the giant dipole resonance (GDR) at finite temperature T in Sn-120 is calculated within the Phonon Damping Model including the neutron thermal pairing gap determined from the modified BCS theory. It is shown that the effect of thermal pairing causes a smaller GDR width at T below 2 MeV as compared to the one obtained neglecting pairing. This improves significantly the agreement between theory and experiment including the most recent data point at T = 1 MeV.
Modified Hartree-Fock-Bogoliubov at finite temperature
Nguyen Dinh Dang,Akito Arima
Physics , 2003, DOI: 10.1103/PhysRevC.68.014318
Abstract: The modified HFB (MHFB) theory at finite temperature is derived, which conserves the unitarity relation of the particle-density matrix. This is achieved by constructing a modified quasiparticle-density matrix, where the fluctuation of the quasiparticle number is microscopically built in. This matrix can be directly obtained from the usual quasiparticle-density matrix by applying the secondary Bogoliubov transformation, which includes the quasiparticle occupation number. It is shown that, in the limit of constant pairing parameter, the MHFB theory yields the previously obtained modified BCS (MBCS) equations. It is also proved that the modified quasiparticle RPA, which is based on the MBCS quasiparticle excitations, conserves the Ikeda sum rule. The numerical calculations of the pairing gap, heat capacity, level density, and level density parameter within the MBCS theory are carried out for $^{120}$Sn. The results show that the superfluid - normal phase transition is completely washed out. The applicability of the MBCS up to a temperature as high as $T\sim$ 5 MeV is analyzed in detail.
Determination of Matter Surface Distribution of Neutron-rich Nuclei
Akihisa Kohama,Ryoichi Seki,Akito Arima,Shuhei Yamaji
Physics , 2002, DOI: 10.1143/JPSJ.72.2766
Abstract: We demonstrate that the matter density distribution in the surface region is determined well by the use of the relatively low-intensity beams that become available at the upcoming radioactive beam facilities. Following the method used in the analyses of electron scattering, we examine how well the density distribution is determined in a model-independent way by generating pseudo data and by carefully applying statistical and systematic error analyses. We also study how the determination becomes deteriorated in the central region of the density, as the quality of data decreases. Determination of the density distributions of neutron-rich nuclei is performed by fixing parameters in the basis functions to the neighboring stable nuclei. The procedure allows that the knowledge of the density distributions of stable nuclei assists to strengthen the determination of their unstable isotopes.
Delta-Hole Interaction in Nuclei and the Gamow-Teller Strength in ^90Nb
Akito Arima,Wolfgang Bentz,Toshio Suzuki,Toshio Suzuki
Physics , 2000, DOI: 10.1016/S0370-2693(00)01385-X
Abstract: The recently obtained experimental result for the quenching of the GT sum rule in the reaction ^90Zr(p,n)^90Nb is used to extract the value of the Landau-Migdal parameter g_{N\Delta}', taking into account also the effect of the finite range meson exchange interactions. The extracted value is compared to the one obtained in the \pi+\rho exchange model by explicitly taking into account the effects of antisymmetrization and short range correlations. Although the \pi+\rho exchange model tends to give a somewhat stronger quenching than observed experimentally, the results are consistent within the experimental error bars if the quark model value for the parameter f_\Delta/f_\pi is used.
Report by N. Dinh Dang, V. Kim Au, T. Suzuki, and A. Arima on the Comment by V. Yu. Ponomarev
Nguyen Dinh Dang,Vuong Kim Au,Toshio Suzuki,Akito Arima
Physics , 2002,
Abstract: In this report we've shown that the arguments, which the author of the Comment presents to prove his case, are either wrong or irrelevant.
Heterostructure Solar Cells Based on Sol-Gel Deposited SnO2 and Electrochemically Deposited Cu2O  [PDF]
Akito Fukuda, Masaya Ichimura
Materials Sciences and Applications (MSA) , 2013, DOI: 10.4236/msa.2013.46A001
Abstract:

To fabricate a heterostructure solar cell using environmentally friendly materials and low cost techniques, tin oxide (SnO2) and cuprous oxide (Cu2O) were deposited by the sol-gel method and the electrochemical deposition, respectively. The SnO2 films were deposited from a SnCl2 solution containing ethanol and acetic acid. The Cu2O films were deposited using a galvanostatic method from an aqueous bath containing CuSO4 and lactic acid at a temperature of 40°C. The Cu2O/SnO2 heterostructure solar cells showed rectification and photovoltaic properties, and the best cell showed a conversion efficiency of 6.6 × 10-2 % with an open-circuit voltage of 0.29 V, a short-circuit current of 0.58 mA/cm2, and a fill factor of 0.39.

Economic and Environmental Effects of Installing Distributed Energy Resources into a Household  [PDF]
Akito Ozawa, Yoshikuni Yoshida
Low Carbon Economy (LCE) , 2015, DOI: 10.4236/lce.2015.62006
Abstract: Improving energy efficiency in the residential sector is a pressing issue in Japan. This study examines the economic and environmental impacts of introducing the following distributed energy resources: photovoltaics (PV), a fuel cell, and a battery. We estimate electricity and hot water demand profiles of a household by using simulated living activities. Electric power from a residential PV system is also calculated from the observed solar radiation. By using mixed integer programming, we perform a cost minimization operating simulation of a residential PV, fuel cell, and battery. The result suggests that we can create a net-zero energy house by installing both a PV system and a fuel cell into one house. On the other hand, using a battery with a fuel cell increases the household energy cost, and has few effects on CO2 emission reduction.
Engaging with the discourse on lifestyle modifications: Evidence from India
Arima Mishra
Health, Culture and Society , 2011, DOI: 10.5195/hcs.2011.28
Abstract: Lifestyle modifications through a range of health care practices are considered central to the management, control and prevention of chronic non-communicable diseases. While there is a critical perspective on the epistemologies of such global health discourses in existing literature, empirical evidence on how people engage with such prescriptive lifestyle modifications in different cultural contexts is very limited. The paper in this context draws on illness narratives of heart patients to discuss about the anxiety and uncertainty expressed by patients and others about notions of what constitutes ‘healthy’ and ‘risky’. It specifically unpacks the global-local dynamics in the construction of risk and healthy lifestyle and examines the contexts in which such global discourses are embodied, resisted or negotiated in different cultural contexts. The paper also examines how global health discourses travel to local sites through popular press. The paper draws on evidence collected through analyzing two Indian national English dailies and in-depth interviews with heart patients and their family members in Delhi, India in 2007-2008.
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