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Thermal Hazard Evaluation on Self-polymerization of MDI
Sato, Yoshihiko,Okada, Ken,Akiyoshi, Miyako,Murayama, Satoshi,Matsunaga, Takehiro The Korean Society of Safety 2010 International Journal of Safety Vol.9 No.1
Thermal analysis, heating test on gram scale and simulation of exothermic behavior based on kinetic analysis has been conducted in order to evaluate thermal hazards of self-polymerization of MDI. The exothermic reactions of MDI are expected to be the polymerization which forms carbodiimide and carbon dioxide, dimerization and trimerization. When MDI is kept in adiabatic condition during 1 week (10080 hours), the simulated result shows runaway reaction can occur in the case that initial temperature was more than $130^{\circ}C$. The relationship between the initial temperature (T, $^{\circ}C$) and TMR is given in a following equation. TMR=$4.493{\times}10^{-7}$ exp ($9.532{\times}10^3$/(T+273.15)) We propose that the relationship gives important criteria of handling temperature of MDl to prevent a runaway reaction.
Yoshihiko Ogawa,Masatoshi Sato,Takaya Yamashita,Ryuichi Nakano,Satoshi Mochizuki,Kei Kasahara,Hisakazu Yano,Keiichi Mikasa 대한진단검사의학회 2018 Annals of Laboratory Medicine Vol.38 No.1
Dear Editor, Intraabdominal infections are well-known sources of polymicrobial bacteremia [1, 2]. Anaerobes such as Bacteroides spp. and Clostridium spp. account for 30–50% of these cases [2-4]. However, a significant proportion of anaerobes remain unidentified. Lee et al [5] reported that the conventional identification method correctly identifies anaerobic bacteria only 79.4% to the genus level and 60.1% to the species level. Here, we report a case of polymicrobial bacteremia with three anaerobes in a patient with peritonitis following intestinal perforation. The anaerobes included Butyricimonas virosa and Brachyspira pilosicoli, both of which are difficult to identify by the conventional identification method
Compact Robot Face with Simple Mechanical Components
Yoshihiko Takahashi,Hayato Sato 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10
We are developing a robotic face which may be utilized to assist patients in various health care applications. For example, a system which can monitor whether the patient has conformed to their scheduled medication regimen, and prompts patients when and how much to take their next scheduled dosage. Health care data for patients using the system is stored in a computer which determines the actions of the robotic system. The system informs the patient of the times it is necessary for them to consume their medicine and alerts them if they fail to follow their schedule. The robotic system communicates with patients using facial expressions, a voice communication system and a computer monitor. A robot face was designed using simple mechanisms in order to achieve a low cost system. We have designed four robot faces. The first two models were relatively large (30cmx30cmx30cm) using LEGO MINDSTORMS components and DC motors. The third and fourth models were smaller (12cmx12cmx3cm) because we used BioMetal Helix components from the TOKI Corporation. The fourth is an improved model of the third. In this paper, we will explain the design of this fourth model.
Yoshihiko Fujita,Masahiko Kimura,Hiroki Sato,Toshikazu Takata,Nobufumi Ono,Kazuto Nishio 대한약학회 2016 Archives of Pharmacal Research Vol.39 No.6
Rotaxanes comprise a class of interlocked moleculescontaining a wheel threaded onto an axle with blockinggroups on the ends to keep thewheel fromsliding off.Here,weshow that [2][bis(2-(3,5-dimethylphenylcarbonyloxy)ethyl)ammoniumtrifluoromethanesulfonate]-[dibenzo-24-crown-8]rotaxane (TRO-A0001), a rotaxane compound, exerted agrowth inhibitory effect on several human cancer cell lines.AnMTT assay revealed an IC50 of 14-830 nMfor TRO-A0001 inthese cells. Neither the wheel nor the axle part alone inhibitedtumor cell growth, suggesting that the complete rotaxanemolecule with its unique ‘‘intramolecular mobility’’ is requiredto inhibit cell growth. Annexin-V/PI staining provided evidenceof the induction of apoptosis, which was further confirmedby the observation of poly (ADP-ribose) polymerasecleavage. Furthermore, a cell cycle analysis using flowcytometry showed that TRO-A0001 treatment resulted in G1arrest in glioblastoma T98G and melanoma G361 cells. Animmunoblot analysis revealed that in both cell lines, TROA0001treatment caused the induction of p21/Cip1, therebydown-regulating Cdks 2, 4 and 6 and reducing Cyclins D1 andE. The results presented in this study demonstrate cytotoxicityof the rotaxane compound and its potential as a lead compoundfor the development of a chemotherapeutic agent againstcancer.
Yoshihiko Hirotsu,Kazuhisa Sato 한양대학교 세라믹연구소 2005 Journal of Ceramic Processing Research Vol.6 No.3
Atomic ordering of 10-nm-sized L10-FePt, FePd and CoPt nanoparticles have been studied by transmission electron microscopy and electron diffraction. Proceeding of the atomic ordering was confirmed by the increase of coercivity as well as electron diffraction. Among these three kinds of L10 nanoparticles, the atomic ordering reaction proceeded at the lowest temperature as low as 773 K for FePd nanoparticles. Coercivities of FePt and FePd nanoparticles largely increased with particle diameter and reached 10 kOe for 20-nm-sized FePt particles at room temperature. The large coercivity is attributed to the rotation magnetization of single-domain particles. For CoPt nanoparticles the observed coercivity was very small even after annealing at 1023 K for 1h. The slow rate of the L10 ordering can be attributed to the lowest T c/T m value in CoPt nanoparticles. L10 ordering was also confirmed even in very small FePt particles as small as 2-3 nm in diameter. By contrast, FePd nanoparticles with sizes less than 5 nm showed disordered fcc even after annealing at 873 K. The coercivity of 4-nmsized L10-FePt nanoparticles were quite low and the observed largest coercivity was 490 Oe at 10 K after annealing at 873 K for 12 h.
Nishinoshima volcano in the Ogasawara Arc: New continent from the ocean?
Tamura, Yoshihiko,Ishizuka, Osamu,Sato, Tomoki,Nichols, Alexander R. L. John Wiley Sons Australia, Ltd 2019 The island arc Vol.28 No.1
<P><B>Abstract</B></P><P>Nishinoshima, a submarine volcano in the Ogasawara Arc, approximately 1 000 km south of Tokyo, Japan, suddenly erupted in November 2013, after 40 years of dormancy. Olivine‐bearing phenocryst‐poor andesites found in older submarine lavas from the flanks of the volcano have been used to develop a model for the genesis of andesitic lavas from Nishinoshima. In this model, primary andesite magmas originate directly from the mantle as a result of shallow and hydrous melting of plagioclase peridotites. Thus, it only operates beneath Nishinoshima and submarine volcanoes in the Ogasawara Arc and other oceanic arcs, where the crust is thin. The primary magma compositions have changed from basalt, produced at considerable depth, to andesite, produced beneath the existing thinner crust at this location in the arc. This reflects the thermal and mechanical evolution of the mantle wedge and the overlying lithosphere. It is suggested that continental crust‐like andesitic magma builds up beneath submarine volcanoes on thin arc lithosphere today, and has built up beneath such volcanoes in the past. Andesites produced by this shallow and hydrous melting of the mantle could accumulate through collisions of plates to generate continental crust.</P>
Airborne Ku-Band Antenna Subsystem for Satellite Communications
Nuimura, Shuji,Horie, Toshiyuki,Sato, Hiroyuki,Naito, Izuru,Kumoi, Kazunari,Yoshizawa, Hidenori,Konishi, Yoshihiko,Takeuchi, Norio,Shimawaki, Yutaka 통신위성우주산업연구회 2004 Joint Conference on Satellite Communications Vol.2004 No.-
An Airborne Antenna Subsystem (AAS) is presented for Ku-band airborne broadband satellite communications. The AAS employs ultra-low profile dual reflector mechanical scanned antenna to reduce the additional aerodynamic drag with high RF performance up to low elevation beam direction. The AAS achieves precise satellite tracking capability under the severe dynamic condition of airplane. In addition, the AAS achieves precise polarization tracking capability for FSS satellite transponder application. Furthermore, wide-variety of novel technologies have been developed and applied to the AAS, such as high efficiency SSPAs, ultra-thin broadband OMT, etc. The AAS gas been confirmed to achieve excellent performance, and practically operated since Spring of 2004.