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Establishment of Process of Manufacture of Ti-6Al-4V Alloy Sintering Body by MIM
Otsuka A.,Suzuki K.,Achikita M. 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
Ti-6Al-4V has low specific gravity, high corrosion resistance and superior mechanical properties but it is very difficult to control oxygen content in MIM process. It is necessary to use powders with coarse particle size to decrease oxygen content of powders, so feedstocks with poor fluidity and sintered bodies with lower density are obtained in such cases. Fine titanium hydride-dehydride powders were blended with atomized powders to accomplish higher fluidity and sintered density. Sintered bodies had higher sintered density and mechanical properties equivalent to those of wrought materials by controlling oxygen content less than 0.35mass%.
Watanabe, H.,Lorusso, G.,Nishimura, S.,Otsuka, T.,Ogawa, K.,Xu, Z. Y.,Sumikama, T.,Sö,derströ,m, P.-A.,Doornenbal, P.,Li, Z.,Browne, F.,Gey, G.,Jung, H. S.,Taprogge, J.,Vajta, Zs.,Wu, J.,Yagi, American Physical Society 2014 Physical Review Letters Vol.113 No.4
<P>A new isomer with a half-life of 23.0(8) ms has been identified at 2406 keV in (126)Pd and is proposed to have a spin and parity of 10(+) with a maximally aligned configuration comprising two neutron holes in the 1h(11/2) orbit. In addition to an internal-decay branch through a hindered electric octupole transition, β decay from the long-lived isomer was observed to populate excited states at high spins in (126)Ag. The smaller energy difference between the 10(+) and 7(-) isomers in (126)Pd than in the heavier N=80 isotones can be interpreted as being ascribed to the monopole shift of the 1h(11/2) neutron orbit. The effects of the monopole interaction on the evolution of single-neutron energies below (132)Sn are discussed in terms of the central and tensor forces.</P>
Otsuka I.,Wada K.,Watanabe A.,Kadomura T.,Yagi M. 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
Co-based amorphous powder was produced by a new atomization process “Spinning Water Atomization Process (SWAP)”, having rapid super-cooling rate. The composition of the alloys was ((Co0.95Fe0.05)1-xCrx)75Si15B10 (x=0, 0.025, 0.05, 0.075). The powders became the amorphous state even if particle size was up to about 500 μm. The coercive force of powders was about 0.35 - 0.7 Oe. Furthermore, Co-based amorphous powder cores with glass binders were made by cold-pressing and sintering methods. The initial permeability of the core in the frequency range up to 100 kHz was about 110, and the core loss at 100 kHz for Bm = 0.1 T was 350 kW/m3.
Isabella F.D. Pinto,Railmara P. Silva,Adriano de B. Chaves Filho,Lucas S. Dantas,Vanderson S. Bispo,Isaac A. Matos,Felipe A.M. Otsuka,Aline C. Santos,Humberto Reis Matos 한국식품영양과학회 2015 Journal of medicinal food Vol.18 No.7
Coconut water (CW) is a natural nutritious beverage, which contains several biologically active compounds that are traditionally used in the treatment of diarrhea and rehydration. Several works with CW have been related with antioxidant activity, which is very important in the diabetic state. To evaluate the hypoglycemic and nephroprotective activities of CW, alloxan-induced diabetic rats were pre- and post-treated by gavage with CW (3 mL/kg), caffeic acid (CA) (10 and 15 mg/kg), and acarbose (Acb) (714 μg/kg) during a period of 16 days. Body weight, blood glucose, glycated hemoglobin (HbA1c), and Amadori products in plasma and kidney homogenates were evaluated in all groups and used as parameters for the monitoring of the diabetic state. The results showed that rats of the CW+ diabetic group had maintenance in blood glucose compared with the control group (P < .05) in addition to a decrease of HbA1c levels and increase of body weight when compared with the diabetic group rats (P < .05). The animals of the CA and CA+ diabetic groups did not have significant variation of body weight (P < .05) during the experiment; however, they showed decrease in their HbA1c and urea levels in plasma as well as Amadori products in kidney homogenates when compared with the diabetic group (P < .05). Our results indicate that CW has multiple beneficial effects in diabetic rats for preventing hyperglycemia and oxidative stress caused by alloxan.
Results from the IAEA Benchmark of Spallation Models
S. Leray,J. C. David,M. Khandaker,G. Mank,A. Mengoni,N. Otsuka,D. Filges,F. Gallmeier,A. Konobeyev,R. Michel 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
Spallation reactions play an important role in a wide domain of applications. In the simulation codes used in this field, the nuclear interaction cross-sections and characteristics are computed by spallation models. The International Atomic Energy Agency (IAEA) has recently organised a benchmark of the spallation models used or that could be used in the future into high-energy transport codes. The objectives were, first, to assess the prediction capabilities of the different spallation models for the different mass and energy regions and the different exit channels, and, second, to understand the reason for the success or deficiency of the models. Results of the benchmark concerning both the analysis of the prediction capabilities of the models and the first conclusions on the physics of spallation models are presented.
Wellbeing Science and Assistive Technology in Education of Prosthetics & Orthotics
Hisaichi Ohnabe,Hiroshi Otsuka,Rory A. Cooper,Diane Collins,Sala L. Peterson 한국재활복지공학회 2011 한국재활복지공학회 학술대회논문집 Vol.2011 No.11
We introduce wellbeing science & assistive technology in education of prosthetics & orthotics in cases of at Niigata University of Health and Welfare, University of Human Arts and Sciences and University of Pittsburgh. The proportion of wellbeing science and assistive technology in education of prosthetics & orthotics of Niigata University of Health and Welfare (NUHW) is 14%.
Biomechanical and Anatomical Validity of the Short Posterior Arch Screw
Jun Mizutani,Nozomu Inoue,Yoshihisa Otsuka,Aiharu Furuya,Alejandro A. Espinoza Orias,Takanobu Otsuka 대한척추신경외과학회 2019 Neurospine Vol.16 No.2
Objective: This study was conducted to clarify the validity of the short posterior arch screw (S-PAS). The S-PAS is inserted only in the pedicle-analogue portion of the posterior arch. The S-PAS screw length is almost half that conventional C1 lateral mass screws inserted via the posterior arch (via-PAS). S-PAS reduces the risk of vertebral artery injury (VAI) because it never reaches the transverse foramen. Although the biomechanical validity of various C1 lateral mass screws (C1LMS) analyzed in young specimens have been published, that of unicortically inserted C1LMS such as the unicortical Harms screw, S-PAS, and via-PAS for elderly patients is concerning because of the high prevalence of osteoporosis in the elderly. Methods: Nine fresh frozen cadavers (average age at death, 72.1 years) were used for pullout testing. The bone mineral density of each specimen was evaluated using quantitative computed tomography. Results: The pullout strength of via-PAS (1,048.5 N) was significantly greater than that of the unicortical Harms screw (257.9 N) (p<0.05). The pullout strength of S-PAS was 720.3 N, which was also significantly greater than that of the unicortical Harms screw (p<0.05). Conclusion: The via-PAS and S-PAS are valid surgical options, even in elderly patients. Along with sufficient biomechanical strength, the S-PAS screw prevents VAI.
Quasifree Neutron Knockout from Ca54 Corroborates Arising N=34 Neutron Magic Number
Chen, S.,Lee, J.,Doornenbal, P.,Obertelli, A.,Barbieri, C.,Chazono, Y.,Navrá,til, P.,Ogata, K.,Otsuka, T.,Raimondi, F.,Somà,, V.,Utsuno, Y.,Yoshida, K.,Baba, H.,Browne, F.,Calvet, D.,Ch&ac American Physical Society 2019 Physical Review Letters Vol.123 No.14