Repellent Effects of Annona Crude Seed Extract on the Asian Subterranean Termite Coptotermes gestroi Wasmann (Isoptera:Rhinotermitidae)

Crude seed extract of three tropical fruits belonging to the family Annonaceae, viz., sweetsop (Annona squamosa L.), soursop (A. muricata L.) and biriba (Rollinia mucosa Baill.) were investigated for their repellent effects on the Asian subterranean termite Coptotermes gestroi Wasmann (Isoptera: Rhinotermitidae).  Results of laboratory feeding bioassay (choice and no-choice) indicated that crude extract of A. squamosa, A. muricata and R. mucosa had feeding deterrent effects on C. gestroi.  Termites showed significant avoidance behavior to filter paper treated with extracts of the three Annona species investigated.  Soil barrier test revealed that Annona extracts were able to limit penetration of C. gestroi in laboratory tunneling test.  The results suggest that Annona seed extracts may offer an alternative source of natural insecticide against subterranean termites

Performance of Soil Termiticides in Open Field and Under Roof Overhang

The study investigated the difference in performance of termiticides using concrete slab test installed in open field and under roof overhang.  Soil treated with cypermethrin and chlorpyrifos under roof overhang showed lower percentage of termite penetration compared to those in open field in each year of evaluation.  However, in both conditions termites were already able to penetrate treated plots during the first year of trial.  The high percentage of plots attacked by termites could be attributed to several environmental factors such as presence of a wider diversity of termite species, moisture, temperature, soil properties, microbial communities, etc. common in tropical climates.  The results from these two modes of installation could affect protocol used for field trial and the granting of registration or performance warranty to candidate termiticides in tropical countries

Effect of Process Variables on Supercritical Fluid Impregnation of Composites with Tebuconazole

This study examines the effects of pressure, temperature, and treatment time on supercritical fluid impregnation of such composites as plywood, particleboard, flakeboard, and medium-density fiber-board. Carbon dioxide with methanol as a cosolvent was used as the supercritical fluid, with tebuconazole as the biocide. Biocide distribution, as measured by extraction and analysis, generally increased with pressure, temperature, and treatment time, although the retentions sometimes decreased at the highest pressure tested (4500 psig). In general, biocide retentions were far above those required for fungal protection, and the distribution was more uniform than that found with conventional pressure treatments. The results suggest that supercritical fluid impregnation represents a simple method for impregnating composites with biocides without the permanent damage typical of other treatment systems

Effects of Supercritical Fluid Treatments on Physical Properties of Wood-Based Composites

The effects of supercritical fluid (SCF) impregnation on physical properties of composites were investigated at various pressures, temperatures, and treatment times with carbon dioxide as the fluid and tebuconazole as a biocide. In general, within the ranges tested, SCF treatment had no negative effects on modulus of rupture, (MOR), modulus of elasticity, (MOE), or dimensional stability of particleboard, flakeboard, or medium-density fiberboard; in some instances, SCF treatment appeared to be associated with slight property improvements in some panel types. Shear tests of plywood suggested a similar lack of treatment effect. Results indicate that, despite the elevated pressure employed during the process, SCF impregnation does not adversely affect the mechanical properties of various wood-based composites

28th Annual Invitational Madrigal & Chamber Choir Festival

Program listing performers and works performed

Internet Sexual Offending: Overview of Potential Contributing Factors and Intervention Strategies

As Internet accessibility and use increase dramatically, more and more people are turning to it for sexual purposes. This growing use of the Internet for sexual purposes indicates that the proportion of Internet sexual offences also will continue to rise dramatically. This article examines the impact of Internet problematic behaviours on the potential for recidivism among online sexual offenders. It argues for specialised treatment for these offenders whilst providing an overview of approaches that are currently used in other areas to treat problematic behaviours and how they could be used in the treatment of Internet sexual offenders. © 2013 Copyright Taylor and Francis Group, LLC

Effect of process variables on supercritical fluid impregnation of composites with tebuconazole

This study examines the effects of pressure, temperature, and treatment time on supercritical fluid impregnation of such composites as plywood, particleboard, flakeboard, and medium-density fiberboard. Carbon dioxide with methanol as a cosolvent was used as the supercritical fluid, with tebuconazole as the biocide. Biocide distribution, as measured by extraction and analysis, generally increased with pressure, temperature, and treatment time, although the retentions sometimes decreased at the highest pressure tested (4500 psig). In general, biocide retentions were far above those required for fungal protection, and the distribution was more uniform than that found with conventional pressure treatments. The results suggest that supercritical fluid impregnation represents a simple method for impregnating composites with biocides without the permanent damage typical of other treatment systems.Keywords: composites, tebuconazole, supercritical fluids, waferboard, carbon dioxide, flakeboard, fiberboard, plywood, particleboard, pressure treatmen

Effects of supercritical fluid treatments on physical properties of wood-based composites

The effects of supercritical fluid (SCF) impregnation on physical properties of composites were investigated at various pressures, temperatures, and treatment times with carbon dioxide as the fluid and tebuconazole as a biocide. In general, within the ranges tested, SCF treatment had no negative effects on modulus of rupture (MOR), modulus of elasticity (MOE), or dimensional stability of particleboard, flakeboard, or medium-density fiberboard; in some instances, SCF treatment appeared to be associated with slight property improvements in some panel types. Shear tests of plywood suggested a similar lack of treatment effect. Results indicate that, despite the elevated pressure employed during the process, SCF impregnation does not adversely affect the mechanical properties of various wood-based composites.Keywords: particleboard, supercritical fluid, SCF, strength properties, tebuconazole, plywood, flakeboard, composites, preservative treatment, medium-density fiberboar