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EFFECT OF Na₂O ADDITION ON MAGNETIC PROPERTIES OF SrZn₂-W TYPE HEXAGONAL FERRITE
Hiroshi Yamamoto,Hiroshi Fujii,Takayuki Mitsuoka 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.5
An experiment was carried out to investigate the effect of Na₂O additive on the magnetic and physical properties of SrZn₂-W type hexagonal ferrite. The specimens were prepared by the conventional manufacturing methods without atmosphere control. It was found that the magnetic properties of SrOㆍ2ZnOㆍ8Fe₂O₃ are considerably improved on adding 1.5wt% Na₂O. The optimum condition of making magnet with suitable properties are as follows : chemical analysis composition: Sr²+_(0.852)Zn²+_(l.721)Na+_(0.301)Fe²+_(0.723)Fe³+_(15.703)O_(27) ; semisintering condition: 1300℃ × 1h in air; sintering condition: 1250℃ × 0.5h in air. The magnetic properties are: Jm= 0.390 T, Jr= 0.348 T, H_(cJ)= 133.7 ㎄/m, H_(cB)= 129.7 ㎄/m, (BH)max = 21.50 kJ/㎥, Tc=371℃, H_A= 1091.5㎄/m, K_A = 2.13 × 10^5J/㎥ and n_B= 31.8 μB.
Development of Autonomous Excavation Technology for Hydraulic Excavators
Hiroshi Yamamoto,Masaharu Moteki,Hui Shao,Takashi Ootuki 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
Because extensive dangerous and grueling work is still performed at disaster restoration work sites, research and development of unmanned execution technologies for use to enhance safety has been undertaken. This reportpresents an outline of research and development concerning autonomous excavation by hydraulic excavator performed by applying an IT execution system. As a result of the verification of the excavation motion, finishing excavation wasconfirmed that the difference between the planned trajectory and the trajectory of the actual movement of the tip of the bucket can be kept within 0.1m. It also achieved autonomous loading of the crawler dump truck.
Effect of Ba Stearate Addition on Magnetic Properties of Ba-system W-type Ferrite Magnets
Yamamoto Hiroshi,Nishio Hiroaki,Sawayama Yoshihito 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
An experiment was carried out to investigate the effect of Ba Stearate as a reducing agent on the magnetic and physical properties of anisotropic type ferrite magnets. It was found that the magnetic properties of were improved by adding 0.3 wt% of Ba Stearate, 0.5 wt% of , and 0.5 wt% of CaO together. The optimum conditions for making magnets were as follows; semisintering condition: h in nitrogen gas atmosphere, drying condition: h in air, sintering condition: h in nitrogen gas atmosphere. Magnetic and physical properties of a typical sample were = 0.46 T, = 0.43 T, = 182.3 kA/m, = 177.2 kA/m, = 33.8 kJ/, = and = and = 1332 kA/m.
Yamamoto, Yukio,Lee, Dongwon,Kim, Yoonhee,Lee, Bokyoung,Seo, Changwoo,Kawasaki, Hiroshi,Kuroda, Shinya,Tanaka-Yamamoto, Keiko The Society 2012 The Journal of neuroscience Vol.32 No.41
<P>It was demonstrated previously that a positive feedback loop, including protein kinase C (PKC) and mitogen-activated protein kinase (MAPK), is required for the gradual expression of cerebellar long-term depression (LTD). PKC and MAPK are mutually activated in this loop. MAPK-dependent PKC activation is likely to be mediated by phospholipase A2. On the other hand, it is not clear how PKC activates MAPK. Therefore, the entire picture of this loop was not fully understood. We here test the hypothesis that this loop is completed by the PKC substrate, Raf kinase inhibitory protein (RKIP). To test this hypothesis, we used a mutant form of RKIP that is not phosphorylated by PKC and thus constitutively inhibits Raf-1 and MEK, upstream kinases of MAPK. When this RKIP mutant was introduced into Purkinje cells of mouse cerebellar slices through patch-clamp electrodes, LTD was blocked, while wild-type (WT) RKIP had no effect on LTD. Physiological epistasis experiments demonstrated that RKIP works downstream of PKC and upstream of MAPK during LTD induction. Furthermore, biochemical analyses demonstrated that endogenous RKIP dissociates from Raf-1 and MEK during LTD induction in a PKC-dependent manner, suggesting that RKIP binding-dependent inhibition of Raf-1 and MEK is removed upon LTD induction. We therefore conclude that PKC-dependent regulation of RKIP leads to MAPK activation, with RKIP completing the positive feedback loop that is required for LTD.</P>