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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.
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>
Yasuyuki Maekawa,Shosuke Miyamoto,Koichi Sawai,Yoshiaki Shibagaki,Toru Sato,Mamoru Yamamoto,Hiroyuki Hashiguchi,Shoichiro Fukao 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
Rain attenuation characteristics of the Ku-band up-link satellite signals are presented for the past four years of 2003-2006 in Japan and Indonesia, using Japan’ domestic communication satellite Superbird C that connects Research Institute for Sustainable Humanosphere of Kyoto University (RISH) to Equatorial Atmosphere Radar Observatory (EAR). Compared with the rainfall rates with the same time percentages, equivalent path lengths of the satellite signal against the rain area are shown to be reduced down to 2 km at EAR, which is remarkably shorter than those at RISH in Japan. The almost same attenuation values and annual statistics are, however, obtained from the X-band radar observations simultaneously conducted at EAR. This suggests that long-term radar observations of convective clouds are effective to estimate rain attenuation statistics of the satellite signals in the tropical regions.
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.