Computational analysis of contamination in Kojima Lake using upwind-type finite element method

We have computed the phase of spreading contaminations in Kojima Lake by using the upwind-type finite element method. We have treated the two cases: the pollutant flows from the Sasagase river and from the Kurashiki River. We see that the upwind-type finite element method is effective in both cases, when the diffusion constant is quite small

Effect of the European Union Emission Trading Scheme (EU ETS) on companies: Interviews with European companies

We visited Belgian and Dutch companies that are covered by EU ETS in November 2007, in order to conduct interviews regarding the impact of the scheme and the resultant performance of these companies. The problems of the EU ETS that emerge from this interview are as follows: (1) the redundancy of emission allowance dampens the incentive to reduce the emission of CO2, (2) the allocation scheme fails to consider inter-industrial and/or inter-district fairness, and (3) since the duration of the National Allocation Plan is too short and highly uncertain, it is difficult to implement a long-term reduction investment plan. As European company officers pointed out, the current EU ETS has several problems. However, the recent political debate on the EU ETS seems to have entered a new dimension toward the second period of the National Allocation Plan. For instance, the cap of CO2 emission in the second period has tightened in comparison with the case in the first period, when the allowance excessive. Furthermore, in January 2008, the European Union set the goal of reducing emission by 20% from the 1990 level, by the year 2020. Moreover, the EU intends to introduce the complete auction of emission allowance after the year 2013 excluding the sector that is expected to experience serious leakage problems. The current EU ETS can be regarded as a CO2 reduction scheme in transition. The policy makers of the Japanese government should behold and draw upon the experiences of the European Union in order to implement appropriate policy measures against global warming in Japan.

Set-based Design Method for Multi-objective Structural Design with Conflicting Performances Under Topological Change

In car manufacturing, sustainable structural design with multiple conflicting objectives like weight reduction for less CO2 emission, strength and rigidity is essential. This research focuses on topological optimization method with which greater weight reduction is expected to be achieved. In view of the application of preference set-based design (PSD) method, topologically satisfied design is considered. We applied PSD method to the design of topological model. This study indicates the efficacy of PSD method to topological design problems including weight reduction aspect

Spectral Analysis of Excited Nucleons in Lattice QCD with Maximum Entropy Method

We study the mass spectra of excited baryons with the use of the lattice QCD simulations. We focus our attention on the problem of the level ordering between the positive-parity excited state N'(1440) (the Roper resonance) and the negative-parity excited state N^*(1535). Nearly perfect parity projection is accomplished by combining the quark propagators with periodic and anti-periodic boundary conditions in the temporal direction. Then we extract the spectral functions from the lattice data by utilizing the maximum entropy method. We observe that the masses of the N' and N^* states are close for wide range of the quark masses (M_pi=0.61-1.22 GeV), which is in contrast to the phenomenological prediction of the quark models. The role of the Wilson doublers in the baryonic spectral functions is also studied.Comment: 15 pages, 5 figures included, typos corrected, and references adde

Nucleon structure from 2+1 flavor lattice QCD near the physical point

We present an update on our results of nucleon form factors measured on a large-volume lattice $(8.1\rm{fm})^4$ at almost the physical point in 2+1 flavor QCD. The configurations are generated with the stout-smeared $\mathcal{O}(a)$ improved Wilson quark action and Iwasaki gauge action at $\beta = 1.82$, which corresponds to the lattice spacing of 0.085 fm. The pion mass at the simulation point is about 145 MeV. We determine the iso- vector electric radius and magnetic moment from nucleon electric ($G_E$) and magnetic ($G_M$) form factors. We also report on preliminary results of the axial-vector ($F_A$), induced pseudo-scalar ($F_P$) and pseudo-scalar ($G_P$) form factors in order to verify the axial Ward- Takahashi identity in terms of the nucleon matrix elements, which may be called as the generalized Goldberger-Treiman relation.Comment: 8 pages, 12 figures; talk presented at the 35th International Symposium on Lattice Field Theory, 18-24 June 2017, Granada, Spai

Computational water analysis in an artificial lake: Kojima Lake case

We treat the problem of water pollution by the method of a mathematical model. We illustrate the method of analysis with Kojima Lake. We analyze in-flow and out-flow of the lake, compute numerical solutions of the governing equations of the water flow and the pollutant. The simulation leads to the conclusion concerning the figure of Kojima Lake