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Maekawa, Nobuhiro,Muramatsu, Yu Elsevier 2017 Physics letters: B Vol.767 No.-
<P><B>Abstract</B></P> <P>Recent discovery of neutrino large mixings implies the large mixings in the diagonalizing matrices of 5 ¯ fields in S U ( 5 ) grand unified theory (GUT), while the diagonalizing matrices of <B>10</B> fields of S U ( 5 ) are expected to have small mixings like Cabibbo–Kobayashi–Maskawa matrix. We calculate the predictions of flavor changing nucleon decays (FCND) in S U ( 5 ) , S O ( 10 ) , and <SUB> E 6 </SUB> GUT models which have the above features for mixings. We found that FCND can be the main decay mode and play an important role to test GUT models.</P>
Maekawa, Koichi,Irawan, Paulus,Okamura, Hajime Techno-Press 1997 Structural Engineering and Mechanics, An Int'l Jou Vol.5 No.6
A three-dimensional constitutive modeling for reinforced concrete is presented for finite element nonlinear analysis of reinforced concrete. The targets of interest to the authors are columns confined by lateral steel hoops, RC thin shells subjected to combined in-plane and out-of-plane actions and massive structures of three-dimensional (3D) extent in shear. The elasto-plastic and continuum fracture law is applied to pre-cracked solid concrete. For post cracking formulation, fixed multi-directional smeared crack model is adopted for RC domains of 3D geometry subjected to monotonic and reversed cyclic actions. The authors propose a new scheme of decomposing stress strain fields into sub-planes on which 2D constitutive laws can be applied. The proposed model for 3D reinforced concrete is experimentally verified in both member and structural levels under cyclic actions.
Transformer Equivalent Model for Switching Transients Computation
Maekawa, Toshihiro,Nishiwaki, Susumu,Takahashi, Hideaki,Chigiri, Takeshi,Hosokawa, Osamu,Saida, Toshiyuki The Korean Institute of Electrical Engineers 2011 The Journal of International Council on Electrical Vol.1 No.4
We measured transient recovery voltage (TRV) in a 1500 MVA-525 kV/276 kV/63 kV transformer of the three-phase-in-one-tank type. We proved that TRV can be measured by interrupting the current generated by discharging a capacitor of low voltage through the transformer. The current was interrupted at its zero point by a diode at a low voltage. To calculate TRV via a computation, we developed a transformer equivalent model composed of a L-C multi-mesh circuit. The TRV waveform computed using the transformer equivalent model we developed agreed well with the measured TRV waveform.
Effective Environmental Regimes in East Asia for Climate Change and Environmental Security
Miko Maekawa 사단법인 한국평화연구학회 2014 평화학연구 Vol.15 No.6
The purpose of this paper is to examine the role of the United Nations (UN) and regional collaboration in tackling climate change and environmental security in East Asia. East Asia plays critical roles in both climate change mitigation and adaptation. In order to seek environmental sustainability, the aspect of so-called planetary boundaries also should be taken into consideration, by assessing the thresholds of climate change, biodiversity loss, nitrogen cycle, and others. However, compared to the active economic regional integration, transboundary cooperation in environmental management is rather weak. Despite the regional environmental agreements, the actual implementation and the impacts are quite limited. In East Asia, regional environmental initiatives did not evolve into formal institutions. Cases of the Montreal Protocol and Mekong River transboundary management are examined to draw concrete lessons for effective regional frameworks. Elements for success are to embrace scientific rigor and flexible legal framework for implementation, trade provisions, give support to developing countries through multilateral processes, including the UN and the broader framework for cooperation, including not only the environment, but also socio and economic bargaining. The participation of the super powers in the agreement is also crucial. The environmental concerns should be reflected in the existing regional trade and economic frameworks in the region.
An unusual anatomical variation of the inferior alveolar nerve
Shogo Maekawa,Mizuki Nagata,Yuki Matsushita,R. Shane Tubbs,Joe Iwanaga 대한해부학회 2020 Anatomy & Cell Biology Vol.53 No.4
A number of studies have previously shown variations of inferior alveolar, however, only a few reports focused on nearby the foramen ovale. In a formalin fixed cadaver, we identified three minor branches (anterior, middle, and posterior branches) arising from the main trunk of the mandibular nerve adjacent to the foramen ovale, passing lateral to the maxillary artery (MA), and joining the inferior alveolar nerve. The diameter of the branches was 0.68 mm, 1.43 mm, and 0.40 mm, respectively. The branches traveled inside the lateral pterygoid muscle (LPM) or between the LPM and tensor/levator veli palatini. Moreover, all of the branches were superficial to MA. Knowledge of such a variation might be helpful to dentists during, for example, anesthetic blockade and various oral surgeries.
Relation between Lumbar Twist Angle and Surface Electromyogram (EMG)
Yasuko Maekawa,Akira Shiozaki,Yukie Majima 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
This study measured the twist angle of the lumbar region and the surface electromyogram (EMG) and examined their correlation to elucidate the influence of “twist” on lower back pain (LBP). Using a goniometer (two-way angle and twist sensors) and an EMG (SX230;DKH Co., Ltd.), we conducted measurement by affixing the goniometer on the lumbar vertebral column and the EMG sensor on the right and left sides of L4 (of the erector muscle of the spine). The results show that EMG has higher correlation with twist angle in a standing posture keeping feet closed and has higher correlation with the twist angular velocity in a standing posture keeping feet open in breadth of shoulders. And twist with anteversion has an influence on the lumbar region more.