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Study on Hazard of Toner Cartridge at Recycle Facilities
Koseki, Hiroshi,Iwata, Yusaku,Lim, Woo-Sub The Korean Society of Safety 2012 International Journal of Safety Vol.11 No.1
Because of development of printing technology, toner cartridge particle becomes smaller and more dangerous. And sometimes we had incidents with dust explosion of toner cartridge particle at recycling facilities in Japan. Therefore we studied on hazard of toner particle relating with dust explosion. We found that toner particle is so dangerous compared with most organic solids, even though it does not belong to hazardous materials in the UN regulation and the Japanese Fire Service Law.
Koseki, Hiroshi,Lim, Woo-Sub,Iwata, Yusaku The Korean Society of Safety 2012 International Journal of Safety Vol.11 No.1
Hazard of Biodiesel (BDF) was studied. Biodiesel is a name for a variety of ester-based fuel made from vegetable oils. Recently importance of biodiesel is increasing, and its fires were sometimes reported. Therefore we studied on hazard of biodiesel comparing (petroleum) diesel oil and vegetable oil, raw materials of biodiesel. We found that biodiesel is auto-oxidized easily and ignites, and its flash point decreases when even small amount of methanol exists. And there are various raw materials to manufacture biodiesel, so we studied the difference of these materials, and their aging on safety.
Study on Hazard of Toner Cartridge at Recycle Facilities
( Hiroshi Koseki ),( Yusaku Iwata ),( Woo Sub Lim ) 한국안전학회(구 한국산업안전학회) 2012 International Journal of Safety Vol.11 No.1
Because of development of printing technology, toner cartridge particle becomes smaller and more dangerous. And sometimes we had incidents with dust explosion of toner cartridge particle at recycling facilities in Japan. Therefore we studied on hazard of toner particle relating with dust explosion. We found that toner particle is so dangerous compared with most organic solids, even though it does not belong to hazardous materials in the UN regulation and the Japanese Fire Service Law.
( Hiroshi Koseki ),( Woo Sub Lim ),( Vusaku Iwata ) 한국안전학회(구 한국산업안전학회) 2012 International Journal of Safety Vol.11 No.1
Hazard of Biodiesel (BDF) was studied. Biodiesel is a name for a variety of ester-based fuel made from vegetable oils. Recently importance of biodiesel is increasing, and its fires were sometimes reported. Therefore we studied on hazard of biodiesel comparing (petroleum) diesel oil and vegetable oil, raw materials of biodiesel. We found that biodiesel is auto-oxidized easily and ignites, and its flash point decreases when even small amount of methanol exists. And there are various raw materials to manufacture biodiesel, so we studied the difference of these materials, and their aging on safety.
Ultrasound Measurements on the Skutterudite Compound SmOs4P12
Yoshiki Nakanishi,Gen Koseki,Dai Tamura,Kohei Kurita,Takeshi Saito,Minoru Koseki,Mitsuteru Nakamura,Masahito Yoshizawa,Yuya Koyota,Chihiro Sekine,Takehiko Yagi 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
We have investigated the elastic properties of the Sm-based filled skutterudite compoundSmOs4P12 for the first time. The measurements were performed on polycrystalline samples preparedat high temperatures and high pressures by using a wedge-type, cubic anvil, high-pressureapparatus. A clear and steep decrease was observed at an antiferromagnetic transition temperatureof 4.5 K in the temperature dependence of both the longitudinal and the transverse elastic constants. Absence of a precursor behavior reminds us of the multipolar ordering, possibly octupolarordering, observed in the isostructural system SmRu4P12. The transition is robust against an externalmagnetic field. We argue that the low-lying degenerate levels derived from the 4f-multipletground state of the Sm ion is split by the crystalline electric field in SmOs4P12. Furthermore, wediscuss the phononic properties, which include the ionic degrees of freedom for the rattling motion,and compare them with the values for other isostructural systems.
INFLUENCE OF AERIAL FIRE FIGHTING ON INTENSITY OF RADIATION FROM FIRE
Iwata,Yusaku,Koseki,Hiroshi,Kon,Fumio 한국화재소방학회 1997 한국화재소방학회 학술대회 논문집 Vol.1997 No.-
A large scale fire experiment was conducted through the collaboration between the Tokyo Fire Department and the National Research Institute of Fire and Disaster (NRIFD) for the purpose of studying the effectiveness of aerial fro fighting against urban fire. Ten model houses and ten collapsed model houses were arranged in an area of about <TEX>$2,000\;m^2$</TEX>. Water was dropped totally fourteen times by helicopters onto the model houses. In order to know influence of water drop, radiation was measured by four radiometers and four IR (Infrared) cameras, which were set around the burning area. In this report, the influence of aerial Ore fighting on fire was discussed in terms of irradiance and IR images. Data of irradiance, flame temperature and flame area showed that influence of each water drop continued only at most a minute.
Modeling Quasi-Elastic Properties of Sand while considering Inherent and Stress-Induced Anisotropies
HongNam Nguyen,Junichi Koseki 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.5
The hypoelastic model which can describe inherent and stress-induced anisotropies in the quasi-elastic properties of sand subjected to cyclic triaxial and torsional loadings−was modified to more rationally evaluate the elastic components of sand in the general threedimensional stress state. In the new simulation, the compliance matrix that links the stress and elastic strain increments in the principal stress axes was formulated symmetrically, as required by the law of thermodynamics. Comparisons between the simulation results and experimental data showed that the modified model could effectively simulate the experimental data values. Note that differences between the simulated values of compliance matrix [M] in the material axes obtained by both models were generally small within the employed stress paths, except the M26 and M62 values. The effect of inherent anisotropy on quasi-elastic components of the compliance matrix in the material axes was generally small at low shear stress ratio values (τzθ/σ'θ) during torsional loading from the isotropic stress state, and increased at larger shear stress ratio values, especially during torsional loading from the anisotropic stress state.
A Bioactive Depsidone from Lachnum virgineum (Hyaloscyphaceae)
Yoshihito Shiono,Takuya Koseki,Hiromasa Koyama 한국생약학회 2018 Natural Product Sciences Vol.24 No.2
Norcolensoic acid (1) was isolated from both the fruiting bodies and the liquid culture of Lachnum virgineum. The structures of 1 was determined using spectroscopic methods. Compound 1 was isolated for the first time from this fungus. Compound 1 showed moderate antibacterial and phytotoxic activities.