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RISS 인기검색어
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- 저자 : Reza Alaie (검색결과 2 건)
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Cyclic and Post-Cyclic Shear Behaviour of Interface between Geogrid and EPS Beads-Sand Backfill
Reza Alaie,Reza Jamshidi Chenari 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.9
Lightweight sand–EPS beads composite is a new artificial geo-material, which has been recently found applications in geotechnical engineering projects. A series of laboratory tests were carried out using a large-scale cyclic direct shear test apparatus to evaluate the monotonic, cyclic and post-cyclic behaviour of an interface between EPS-sand mixtures and a Polyfelt geogrid. EPS were added to sand at 0%, 0.5%, 1%, and 2% by weight. Tests were conducted under three different vertical stresses (30 kPa, 60 kPa and 90 kPa). The influences of cyclic shear semi-amplitude, number of cycles and normal stress on interface properties are investigated. The test results revealed that for a given strain level, interface shear stiffness decreases and damping ratio was shown to increase with increasing EPS content. Hardening behaviour was observed with the number of cycles under different normal stress levels and EPS contents. The EPS-sand-geogrid specimens did not develop clear peak shear stress at monotonic and post-cyclic direct shear tests. The EPS-sand-geogrid mixtures represent an overall contraction behaviour in monotonic, cyclic and post-cyclic stages. The apparent adhesion of interface was shown to increase and the friction angle of interface to decrease with EPS content.
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Qasem Mousavi Seyed,Reza Bandani Ali,Alaie Ebrahim 한국응용곤충학회 2020 Journal of Asia-Pacific Entomology Vol.23 No.4
The symbiotic microorganisms in the gut of termites play a key role in the digestion of cellulose and nitrogen metabolism. Therefore, disruption of these symbioses activity can open a door toward termite management. Thus, the current study aimed to exploit termite gut bacterial capacity in order to utilize it for efficient termite control. So, in the current study, gut bacteria of Microcerotermes diversus have been extracted, cultivated on both liquid and solid media, and screened with a range of antibiotics to find the most effective antibiotics. Results showed that chloramphenicol and nalidixic acid were the most effective antibiotics in preventing the colony unit formation of the gut bacteria amongst 16 antibiotics tested. Also, from two chitin synthesis inhibitors tested hexaflumuron with an LC 50 of 613.9 µg ml −1 was more toxic than lufenuron with an LC 50 of 1414.5 µg ml −1 . Thus, two antibiotics (chloramphenicol and nalidixic acid) were used simultaneously with a sub-lethal con centration of hexaflumuron against the termite and a variety of factors such as wood consumption rate, running speed, body water content, and tunneling activity were evaluated under laboratory conditions. Results showed that the combination of these two antibiotics (chloramphenicol and nalidixic acid) with hexaflumuron caused a significant decrease in termite consumption rate, running speed, and tunneling behavior, but didn’t affect the body water contents of termites. These results suggest that using a combination of antibiotic/s and hexaflumuron is a promising management practice to get a suitable control measure for the studied termite.
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