排序方式: 共有8条查询结果,搜索用时 15 毫秒
1
1.
Shinya Inazumi Hiroyasu Ohtsu Yu Otake Makoto Kimura Masashi Kamon 《Journal of Material Cycles and Waste Management》2009,11(1):55-64
An evaluation method that can express the local leakage of leachate from joint sections in steel pipe sheet pile (SPSP) cutoff
walls is discussed in this study. In particular, the evaluation of environmental feasibility (containment of leachates containing
toxic substances) considering a three-dimensional arrangement and hydraulic conductivity distribution of the joint sections
in the SPSP cutoff wall is compared with an evaluation that uses the equivalent hydraulic conductivity. This equivalent hydraulic
conductivity assumes that the joint section and the steel pipe are integrated; therefore, the hydraulic conductivity is substituted
with a uniform permeable layer. However, in an evaluation that employs the equivalent hydraulic conductivity, it is difficult
to consider the local leakage of leachate containing toxic substances from the joint sections in the SPSP cutoff wall. It
was established that evaluations of the environmental feasibility of SPSP cutoff walls with joint sections must take into
account the local leakage of leachates containing toxic substances from the joint sections. Also, it was clarified that technologies
that lower the hydraulic conductivities of joint sections in SPSP cutoff walls and also facilitate the use of sparser joint
arrangements contribute significantly to increasing the environmental feasibility of SPSP cutoff walls at landfill sites. 相似文献
2.
Suksaeree Jirapornchai Maneewattanapinyo Pattwat Panrat Kamon Pichayakorn Wiwat Monton Chaowalit 《Journal of Polymers and the Environment》2021,29(10):3174-3184
Journal of Polymers and the Environment - In this study, solvent-cast polymeric films containing ionic liquid lidocaine/aspirin for transdermal patches were developed. Solvent-cast polymeric films... 相似文献
3.
Pichayakorn Wiwat Panrat Kamon Suksaeree Jirapornchai Taweepreda Wirach 《Journal of Polymers and the Environment》2022,30(3):925-937
Journal of Polymers and the Environment - The aim of this study was to investigate the feasibility of concentrated natural rubber latex (CNRL), a major polymer, blended with either... 相似文献
4.
Desorption characteristics of kaolin clay contaminated with zinc from electrokinetic soil processing 总被引:1,自引:0,他引:1
A number of bench scale laboratory column tests were carried out using a newly designed and developed electrokinetic cell
to investigate the fundamental behavior of zinc-spiked kaolin clay subjected to an electric field. Laboratory investigations
focused on (i) zinc migration by the combined effects of electromigration and electro-osmosis and (ii) the electrically induced
desorption characteristics of zinc-contaminated kaolin that occurred during processing. The correlations of the applied voltage
gradient, electro-osmotic flow rate, and the development of a pH gradient were examined and evaluated. The results showed
that the removal efficiency was high during the early stage of processing due to rapid desorption by electrokinetic effects
in the cathode region. However, the majority of zinc migrating from the anode was precipitated due to the high pH environment
in the cathode region. 相似文献
5.
Jirapornchai Suksaeree Phatipan Karnsopa Nannapat Wannaphruek Jessada Prasomkij Kamon Panrat Wiwat Pichayakorn 《Journal of Polymers and the Environment》2018,26(8):3216-3225
Many natural polymers with various chemical structures are used to prepare transdermal patches. Pectin is a one interesting type of polymer because it can control drug release when used in transdermal patches. In Thailand, the waste from durian fruit-hulls is a major problem for the environment. However, the pectin from it can be isolated under acid conditions and used to prepare transdermal patches for nicotine delivery which has not yet been reported. As the isolated pectin is a natural polymer, the film made from isolated pectin is a brittle; therefore, adding a low protein natural rubber latex (LPNRL) polymer was needed to increase its flexibility. The transdermal patches were amorphous and had Tg values ranging from 81.0 to 93.3 °C. Moisture uptake, swelling ratio, and erosion values of the patches were significantly decreased after addition of LPNRL, which resulted in low hydrophilicity. The in vitro release and permeation of nicotine depends on the hydrophilicity of the patches. The kinetic models for in vitro release and permeation of nicotine were Higuchi model and zero order, respectively. In conclusion, pectin isolated from fruit-hulls of Mon Thong durians is an effective polymer to control the release of nicotine. It also is an option that could solve the environmental problems caused by durian fruit-hulls waste. 相似文献
6.
Jirapornchai Suksaeree Phatipan Karnsopa Nannapat Wannaphruek Jessada Prasomkij Kamon Panrat Chaowalit Monton Wiwat Pichayakorn 《Journal of Polymers and the Environment》2018,26(9):3531-3539
Pectin is a natural biopolymer, and a major component of a complex heterogeneous polysaccharide found in the primary cell walls and middle lamella of plant tissues. This paper used pectin isolated from Cissampelos pareira (Krueo Ma Noy) leaves to prepare the matrix layer for nicotine transdermal patches. However, the patch was a brittle film, thus, deproteinized natural rubber latex (DNRL) was blended to improve flexibility of the patch. Here we present for the first time a preparation study exploring the suitability of isolated pectin blends to serve as drug carriers and the mechanism controlling the release patterns of nicotine. The hydrophilicity of the patches was found to decrease when increasing the DNRL ratio. Differential scanning calorimetry and X-ray diffraction experiments were used to characterize the interactions between the investigated drugs and the matrix polymers. In vitro studies showed that the isolated pectin blends were an effective matrix for controlled nicotine release. The release and permeation patterns of nicotine depend on the hydrophilicity of the patches. The kinetic models of nicotine were found to be a Higuchi model and zero order for in vitro release and skin permeation, respectively. 相似文献
7.
Max Vercruyssen Eliazor Kamon Peter A Hancock 《International journal of occupational safety and ergonomics》2007,13(1):15-27
On separate days, 6 highly trained participants performed psychomotor tests while breathing for 60 min 3 carbon dioxide (CO(2)) mixtures (room air, 3% CO(2), or 4% CO(2)) prior to, between, and following two 15-min treadmill exercise bouts (70% VO(2)(max)). Each individual was extensively practiced (at least 4 days) before testing began, and both gas conditions and order of tasks were counterbalanced. Results showed physiological reactions and work-related psychomotor effects, but no effects of gas concentration on addition, multiplication, grammatical reasoning, or dynamic postural balance. These findings help define behavioral toxicity levels and support a re-evaluation of existing standards for the maximum allowable concentrations (also emergency and continuous exposure guidance levels) of CO(2). This research explored the selection of psychometric instruments of sufficient sensitivity and reliability to detect subtle changes in performance caused by exposure to low levels of environmental stress, in this case differential levels of CO(2) in the inspired air. 相似文献
8.
Pichayakorn Wiwat Maneewattanapinyo Pattwat Panrat Kamon Monton Chaowalit Suksaeree Jirapornchai 《Journal of Polymers and the Environment》2022,30(10):4479-4491
Journal of Polymers and the Environment - This work prepared oral strip-film for nicotine delivery using polyvinyl alcohol and polyvinylpyrrolidone as polymeric film and glycerin as a plasticizer.... 相似文献
1