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Effect of molding condition on tensile properties of hemp fiber reinforced composite
Takemura, K.,Minekage, Y. The Korean Society for Composite Materials 2007 Advanced composite materials Vol.16 No.4
In this study, the effect of molding condition on the tensile properties for plain woven hemp fiber reinforced green composite was examined. The tensile properties of the composite were compared with those of the plain woven jute fiber composite fabricated by the same process. Emulsion type biodegradable resin or polypropylene sheet was used as matrix. The composites were processed by the compression molding where the molding temperature and its heating time were changed from 160 to $190^{\circ}C$ and from 15 to 25 min, respectively. The following results were obtained from the experiment. The tensile property of hemp fiber reinforced polypropylene is improved in comparison with polypropylene bulk. The strength of composite is about 2.6 times that of the resin bulk specimen. Hemp fiber is more effective than jute fiber as reinforcement for green composite from the viewpoint of strength. The molding temperature and time are suitable below $180^{\circ}C$ and 20 min for hemp fiber reinforced green composite. Hemp fiber green composite has a tendency to decrease its tensile strength when fiber content is over 50 wt%.
Lee, Sang Won,Bae, Seongtae,Takemura, Y.,Yamashita, E.,Kunisaki, J.,Zurn, S.,Kim, Chul Sung IEEE 2006 IEEE transactions on magnetics Vol.42 No.10
This paper reports first on the very promising self-heating and temperature rising characteristics of solid-state NiFe<SUB>2</SUB>O<SUB>4</SUB> nanoparticles for hyperthermia applications. NiFe<SUB>2</SUB>O<SUB>4</SUB> nanoparticles were prepared by using both the "high temperature thermal decomposition method (HTTD)" and the "newly modified sol-gel" methods. The magnetic properties and cell-cytotoxic properties of the synthesized NiFe<SUB>2</SUB>O<SUB>4</SUB> nanoparticles were investigated to consider these nanoparticles for in vivo hyperthermia applications. The saturation magnetic moments measured by a high sensitive SQUID were between 43.0 and 47.6 emu/g. The cell survival rates of NiFe<SUB>2</SUB>O<SUB>4</SUB> and chitosan coated NiFe<SUB>2</SUB>O<SUB>4</SUB>, which were determined by MTT assay, around 85 % and 98.8 %, respectively. The maximum self-heating temperature induced by our specially designed RF-MRI modified L-C circuit was 47.3°C and the frequency and magnetic field product, H<SUB>0</SUB>f was 1.07 × 10<SUP>9</SUP> Am<SUP>-1</SUP> s<SUP>-1</SUP>.