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Magnetic Properties of C15 the Laves-phase Compound SmRu2
Yusuke Amakai,Mototsugu Sato,Shigeyuki Murayama,Naoki Momono,Hideaki Takano 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
We report the magnetic properties of the polycrystalline C15 Laves-phase rare-earth compoundSmRu2. The sample of SmRu2 was made by using an arc-melt method and was annealed under500 C in vacuumed quartz tube for 50 hours. The magnetic susceptibility χ of SmRu2 followsa Curie-Weiss law at temperature above 80 K. The effective paramagnetic moment peff is 1.39µB/Sm-atom, and the Weiss temperature has a positive value of 42 K. The low-temperature χ forT < 60 K increases rapidly with decreasing temperature. In the resistivity and the specific heatCp, we found an inflection and a jump, respectively, at about 55 K. Furthermore, we observed ahysteresis in the magnetic field dependence of the magnetization at 2 K. These experimental resultssuggest that the C15 Laves-phase compound SmRu2 is a ferromagnetic material with TC 55 K.
Drilling force and speed for mandibular trabecular bone in oral implant surgery
bin Kamisan, Mohammad Aimaduddin Atiq,Yokota, Kenichiro,Ueno, Takayuki,Kinoshita, Hideaki,Homma, Shinya,Yajima, Yasutomo,Abe, Shinichi,Takano, Naoki Techno-Press 2016 Biomaterials and biomedical engineering Vol.3 No.1
Based on a survey done recently in Japan, 30 percent of the serious accidents occurred in oral implant surgery were concerned with the mandibular canal and 3/4 of them were related to drilling. One of the reasons lies in the lack of the education system. To overcome this problem, a new educational system focusing on drilling the mandibular trabecular bone has been developed mainly for dental college students in the form of an oral implant surgery training simulator that enables student to sense the reaction force during drilling. On the other hand, the conventional system uses polymeric model. Based on these systems, two approaches were proposed; the evaluation by experienced clinicians using the simulator, and experimental works on the polymeric model. Focusing on the combination of the drilling force sensed and drilling speed obtained through both approaches, the results were compared. It was found that the polymeric models were much softer especially near the mandibular canal. In addition, the study gave us an insight of the understanding in bone quality through tactile sensation of the drilling force and speed. Furthermore, the clinicians positively reviewed the simulator as a valid tool.
Drilling force and speed for mandibular trabecular bone in oral implant surgery
bin Kamisan, Mohammad Aimaduddin Atiq,Yokota, Kenichiro,Ueno, Takayuki,Kinoshita, Hideaki,Homma, Shinya,Yajima, Yasutomo,Abe, Shinichi,Takano, Naoki Techno-Press 2016 Biomaterials and Biomechanics in Bioengineering Vol.3 No.1
Based on a survey done recently in Japan, 30 percent of the serious accidents occurred in oral implant surgery were concerned with the mandibular canal and 3/4 of them were related to drilling. One of the reasons lies in the lack of the education system. To overcome this problem, a new educational system focusing on drilling the mandibular trabecular bone has been developed mainly for dental college students in the form of an oral implant surgery training simulator that enables student to sense the reaction force during drilling. On the other hand, the conventional system uses polymeric model. Based on these systems, two approaches were proposed; the evaluation by experienced clinicians using the simulator, and experimental works on the polymeric model. Focusing on the combination of the drilling force sensed and drilling speed obtained through both approaches, the results were compared. It was found that the polymeric models were much softer especially near the mandibular canal. In addition, the study gave us an insight of the understanding in bone quality through tactile sensation of the drilling force and speed. Furthermore, the clinicians positively reviewed the simulator as a valid tool.
Structures and Magnetic Properties of Tm1−yYyMn1−xCoxO3
Toshiyuki Tanaka,Akira Kumagai,Yusuke Amakai,Naoki Momono,Shigeyuki Murayama,Hideaki Takano 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
The structure and magnetic properties of Tm1−yYyMn1−xCoxO3 with 0 5 x 5 0.5 and0 5 y 5 0.3 were investigated by X-ray diffraction, specific heat and magnetization measurements. Thulium manganite TmMnO3 prepared by solid-state synthesis at ambient pressure ishexagonal and antiferromagnetic with a N`eel temperature TN of 86 K. The substitution of Y for Tmin TmMnO3 does not greatly affect the fundamental hexagonal structure. The magnetization andspecific heat measurement results for Tm1−yYyMnO3 can be qualitatively explained in terms of thedilution effect of Tm by Y. On the other hand, the structure of TmMn1−xCoxO3 changes graduallyfrom hexagonal to orthorhombic with the substitution of Co for Mn; hexagonal and orthorhombicphases coexist in samples for x 5 0.3 whereas TmMn0.6Co0.4O3 is almost a single orthorhombicphase. The magnetization of TmMn0.6Co0.4O3 in a field of 250 Oe increases rapidly at about60K with decreasing temperature. The difference between zero-field-cooled (ZFC) and field-cooled(FC) magnetizations increases remarkably at about 60 K. Moreover, the temperature dependencesof the ZFC and the FC magnetizations exhibit peaks at about 40 and 30 K, respectively. Thus,TmMn1−xCoxO3 exhibits complex magnetic properties.