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Structure and Properties for 28 GHz Microwave Sintered PZT Nanocomposites
Tajima, Ken-ichi,Hwang, Hae-Jin,Sando, Mutsuo,Niihara, Koichi The Korean Ceramic Society 1998 The Korean journal of ceramics Vol.4 No.4
Dense $ Pb(Zr, Ti)O_3(PZT)/Al_2O_3$ nanocomposites were prepared by the 28 GHz microwave heating method and conventional electric furnace sintering. Electrical and mechanical properties of the composites were investigated. The fracture strength of the PZT composites with 0.1vol% $Al_2O_3$ was significantly improved in both sintering methods. Smaller grain size and effective reinforcement of the PZT matrix by the second phase were considered to be responsible for the excellent fracture strength. Planar electromechanical coupling factor Kp of the composites sintered by 28GHz microwave heating was higher than that of the materical prepared by the conventional route. It seemed that the control of the reaction between PZT and $Al_2O_3$ by the microwave rapid sintering resulted in the high piezoelectric properties.
Shori Tajima,Keiko Danzaki,Katsuhisa Ikeda,Kazusaku Kamiya 생화학분자생물학회 2020 Experimental and molecular medicine Vol.52 No.-
Age-related hearing loss (ARHL) is the progressive, bilateral loss of high-frequency hearing in elderly people. Mutations in GJB2, encoding the cochlear gap junction protein connexin26 (Cx26), are the most frequent cause of hereditary deafness; however, a common molecular pathology between ARHL and GJB2-related hearing loss has not been reported. Here, we investigated the quantitative change in expression and molecular pathology of Cx26 in ARHL. We used C57BL/6J mice as a model of ARHL. Hearing levels that were evaluated by auditory brainstem response thresholds increased gradually between 4 and 32 weeks of age and increased sharply at 36 weeks. Gap junctions in the cochleae of 4-week-old mice had linear plaques along cell–cell junction sites. In contrast, the cochleae from 32-weekold mice had significantly shorter gap junctions. Severe hair cell loss was not observed during this period. Based on western blotting, Cx26 and connexin30 (Cx30) levels were significantly decreased at 32 weeks compared with 4 weeks. Moreover, Cx26 was more significantly enriched in the hydrophilic fraction at 4 weeks but was more significantly enriched in the hydrophobic fraction at 32 weeks, indicating an age-related conversion of this biochemical property. Thus, the hydrophobic conversion of Cx26 and disruption of gap junction proteins and plaques may be involved in the pathogenesis of ARHL and may occur before severe hair cell degeneration.
Explaining Ethnic Violence in Indonesia: Demilitarizing Domestic Security
Yuhki Tajima 동아시아연구원 2008 Journal of East Asian Studies Vol.8 No.3
Recent scholarship on communal violence in Indonesia since the late New Order has focused on identifying causal mechanisms of particular subtypes of communal violence such as large-scale communal violence, town-level communal rioting, intervillage violence, and lynching. While such analyses are useful in understanding aspects specific to each subtype of violence, analyzing each subtype separately risks the analytical problem of selection on the dependent variable if there are important similarities across subtypes. Drawing on the observation that each of these subtypes appeared to rise and fall together since the late New Order, I propose a common factor that can explain the broad temporal patterns of communal violence. In particular, I point to increasing restraints on the military that arose from intraregime infighting, greater scrutiny of military actions during the keterbukaan (political openness) period, and the withdrawal of the military from police duties during Reformasi. I examine four cases of communal conflict: (1) a case in which intravillage violence was averted, (2) a case of lynching, (3) a case of lynching and subsequent intervillage reprisals, and (4) a case of large-scale communal violence. The first three cases are from Lampung province, and the fourth is the case of Poso district, Central Sulawesi