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( Hiroaki Takahashi ),( Fumitake Takahashi ),( Yong Chil Seo ) 한국폐기물자원순환학회(구 한국폐기물학회) 2013 한국폐기물자원순환학회 추계학술발표논문집 Vol.2013 No.-
1. Background The great earthquake with the magnitude of 9.0, called as Great East Japan Earthquake, attacked East Japan area on 11th Mar. 2011 and caused following tsunami. The earthquake and tsunami generated massive disaster wastes which are still preventing from disaster recovery. Therefore, disaster wastes management is important to recover local society, economy, and environment. This study focuses on mercury, which is toxic heavy metal and can cause Minamata deceases, contained in huge amount of disaster wastes. Because some daily life products and medical products like fluorescent light, blood pressure manometer, and mercury-type thermometer contain mercury, the management, treatment, and disposal of disaster wastes might have significant impact on mercury emission to the environment. In this context, the purpose of this study is to estimate potential mercury distribution of disaster wastes preliminarily. 2. Method At first, the authors estimated the total amount of disaster wastes by two methods. The first estimate was according to emission factors reported based on some past earthquake disaster records. The other was according to summarized operational data of some disaster waste treatment facilities. It should be noted that these estimates should need great verification because they were based on many assumptions. Although disaster wastes have some categories like combustible, wood, and metals, their summation would be reported here. Mercury distribution of disaster wastes was calculated based on mercury content of each waste category. It also should be noted that mercury content would have non-negligible uncertainty. 3. Results and discussion Estimated total amount of disaster wastes are summarized in Table 1. There are large differences between two cases for sea sediment. This needs further study for the verification. Potential mercury distribution of disaster wastes is shown in Fig. 1. Medical wastes and fluorescent lumps are major mercury sources. Around 39% of mercury contained in disaster wastes might incorporated into cement kilns, which recycled disaster wastes as cement production resources. Although recycle of disaster wastes is preferable from the viewpoint of disaster recovery, it might have non-negligible impact on mercury emission to the atmosphere. 4. Conclusion The total amount of disaster wastes, generated by Great East Japan Earthquake and following tsunami, and potential mercury distribution of disaster wastes were estimated preliminarily. This suggests that medical wastes and fluorescent lumps might be large mercury sources. However, these estimates should have large uncertainty and needs further verification.
Synthesis and Characterization of Delafossite for Thermoelectric Application
Takahashi Yuhsuke,Matsushita Hiroaki,Katsui Akinori 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
The preparation of single-phase with delafossite-type structure by means of the solid-state reaction method was investigated using X-ray diffraction. The results showed that notwhistanding the fact that there was a trace of metallic copper, nearly single-phase was obtained by using as a lanthanum source and by firing the mixed powder with nonstoichiometric composition ratio of in a vacuum at 1273 K for 10 h. The measurement of electrical conductivity and Seebeck coefficient showed that thus obtained was a p-type semiconductor and had a Seebeck coefficient of approximately .
Fabrication of Ruby thin film for temperature indicator application
Hiroaki Aizawa,Kenichi Ito,Sayaka Takahashi,Shuji Komuro,Yukari Miyazaki,Tooru Katsumata 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
Chromium doped sapphire (Ruby) films have been fabricated on Si substrate by laser ablation, and their fundamental optical property and thermal characteristics are evaluated for temperature sensor application. The red emission near 700 nm which originates from 3d transition in Cr<SUP>3+</SUP> ions was clearly observed from the Ruby films. The split of PL peak, originated in 3d-orbital of chromium ion, is also clearly observed from Ruby films. Temperature dependence of PL spectrum from ruby films was measured under Ar laser excitation. PL intensity and PL peak positiongreatly vary with temperature ranging from 293 K to 443 K. To take the advantage of this phenomenon, the temperature sensor with calibration free can be developed.
Hiroaki Yoda,Kazuo Uranishi,Chikara Takahashi,Yasuo Handa 한국유체기계학회 2021 International journal of fluid machinery and syste Vol.14 No.3
Pump efficiency correction equations for converting from water to viscous liquids have been established for the turbulent-flow and laminar-flow regions. However, the two equations are discontinuous in the transient-flow region. This paper proposes a new equation for the transient-flow region that is based on fluid-dynamical considerations. Moreover, an alternative equation is examined for the turbulent-flow region that avoids an underestimate caused by the current efficiency correction equation that was adopted in ISO/TR 17766.