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Kokubo, Tadashi,Uenoyama, Mayo,Kim, Hyun-Min,Minoda, Masahiko,Miyamoto, Takeaki,Nakamura, Takashi The Korean Ceramic Society 1999 The Korean journal of ceramics Vol.5 No.3
Polyethylene was modified with silanol groups on its surface by photografting of vinyltrimethoxysilane in vapor phase by using benzophenon as a polymerization initiator and by hydrolyzing the methoxysilane groups into the silanol groups with HCI solution. The modified polyethylene formed a dense and homogeneous apatite layer on its surface in a solution with ion concentrations 1.5 times those of human blood plasma within 21 days. This kind of biomimetic process could provide techniques for fabricating apatite-polymer composites with three dimensional structure analogous to the natural bone.
( Hikaru Kano ),( Etsuji Uenoyama ) 한국폐기물자원순환학회 2002 APLAS Vol.2002 No.2
매립지에서, 지오멤브레인은 오랫동안 폐기물 처분으로부터 침출수가 누출되지 않도록 하는 중요한 임무를 가진다. 지오멤브레인은 매립지의 바닥에서 침출수와 접촉한 상태와 경사면에서 자연 환경에 노출되었을 때에 장기간 내구성을 보인다. 우리는 몇몇 지오멤브레인이 매립지에서 물이나 산, 알칼리, heat aging, 자외선 등 파괴 요소에 대한 내구성을 연구하였다. In waste disposal landfill, Geomembranes have important mission that they do not leak out leachet immersed out from waste disposal for a long time. Geomembranes are showed long life durability under the condition which Geomembranes contact leachet on the bottom of landfill and expose sever natural circumstance on the slope of it. We study the durability of several Geomembranes for factors of destruction, that is, resistances of water, acids, alkalis, heat aging and ultra violet occurred in waste disposal landfill.
LONG LIFE DURABILITY OF SEVERAL GEOMEMBRANES
( Hikaru Kano ),( Etsuji Uenoyama ) 한국폐기물자원순환학회 2002 APLAS Vol.2002 No.1
In waste disposal landfill, Geomembranes have important mission that they do not leak out leachet immersed out from waste disposal for a long time. Geomembranes are showed long life durability under the condition which Geomembranes contact leachet on the bottom of landfill and expose sever natural circumstance on the slope of it. We study the durability of several Geomembranes for factors of destruction, that is, resistances of water, acids, alkalis, heat aging and ultra violet occurred in waste disposal landfill.
Tep Bengthay,Morita Yasuhiro,Matsuyama Shuichi,Ohkura Satoshi,Inoue Naoko,Tsukamura Hiroko,Uenoyama Yoshihisa,Pheng Vutha 아세아·태평양축산학회 2020 Animal Bioscience Vol.33 No.12
Objective: The present study aimed to survey seasonal changes in reproductive performance of local cows receiving artificial insemination (AI) in the Pursat province of Cambodia, a tropical country, to investigate if ambient conditions affect the reproductive performance of cows as to better understand the major problems regarding cattle production. Methods: The number of cows receiving AI, resultant number of calving, and calving rate were analyzed for those receiving the first AI from 2016 to 2017. The year was divided into three seasons: cool/dry (from November to February), hot/dry (from March to June), and wet (from July to October), based on the maximal temperature and rainfall in Pursat, to analyze the relationship between ambient conditions and the reproductive performance of cows. Body condition scores (BCS) and feeding schemes were also analyzed in these seasons. Results: The number of cows receiving AI was significantly higher in the cool/dry season than the wet season. The number of calving and calving rate were significantly higher in cows receiving AI in the cool/dry season compared with the hot/dry and wet seasons. The cows showed higher BCSs in the cool/dry season compared to the hot/dry and wet seasons probably due to the seasonal changes in the feeding schemes: these cows grazed on wild grasses in the cool/dry season but fed with a limited amount of grasses and straw in the hot/dry and wet seasons. Conclusion: The present study suggests that the low number of cows receiving AI, low number of calving, and low calving rate could be mainly due to poor body condition as a result of the poor feeding schemes during the hot/dry and wet seasons. The improvement of body condition by the refinement of feeding schemes may contribute to an increase in the reproductive performance in cows during the hot/dry and wet seasons in Cambodia.