Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 98 for “"preservative"”.
-
Coating Performance on Preservative Treated Wood
… life is significantly prolonged by the use of preservatives. Unfortunately, preservative treated wood is still susceptible to weathering degradation (UV and moisture) and subsequent leaching of preserving components. These negative impacts of weathering can be reduced by the application of a …
-
Environmental and efficacy studies of a chromated fluoride wood preservative
… for this decay a waterborne chromated fluoride preservative paste, Rentex, has been proposed for in-situ remedial groundline injection treatment of creosoted distribution poles. The Rentex formulation has been investigated with a view to firstly establishing its temporal effectiveness in …
-
Preservative treatment evaluation of five Appalachian wood species with four preservatives
… has been treated almost exclusively with the preservative creosote in order to improve durability. This has led to the knowledge that hardwoods treated with creosote are extremely durable. However, there have been few well documented studies of what has been termed "treatability". This work …
-
Preservative Effects of Covering and Propionic Acid on Alfalfa Haylage in Bunker Silos
<p>The preservation efficiency of covering alfalfa haylage with black plastic (polyethylene) and/or treating haylage with propionic acid was studied in two trials. Experiment 1 was designed to evaluate the influence of both covering and treatment with propionic acid on haylage chemical composition …
-
Studies of the interactions of CCA and ACA preservative treated wood with soil
… soil, and wood treated with CCA or ACA wood preservatives were investigated using a series of leaching and soil burial studies. The softwoods Scots pine (<i>Pinus sylvestris</i>, L.), Sitka spruce (<i>Picea sitchensis</i>, Carr) and the hardwood lime (<i>Tilia vulgaris</i>, Hayne) were used …
-
Use of biological agents to enhance the preservative treatment of electrical distribution poles
Treatment of timber with preservative varies from species to species. Poor preservative penetration has been associated with wood decay and shortened service life of treated timbers. The preservation of Sitka spruce and Scots pine heartwood by conventional methods is poor with the depth of …
-
The Efficacy of a Borate and Penetrating Oil Preservative Combination for the Conservation of Exterior Wood
… a nano-size iron oxide and zinc oxide based wood preservative system for cypress (Taxodium distichum) and western redcedar (Thuja plicata). The objectives are as follows, 1) To test the efficacy and performance of the coating to retain the borates through accelerated weathering test (QUV) on …
-
Studies on soluble nutrient components in wood and their influence on decay susceptibility and preservative efficacy
… influence these nutrients have on wood decay and preservative performance. <br/><br/>Specific soluble carbohydrates and amino acids were shown to redistribute and accumulate at surface regions of wood during drying. Analysis of dried wood showed that soluble carbohydrates constituted 2-5% of the …
-
THOREAU'S A WEEK, RELIGION AS PRESERVATIVE CARE: OPPOSING THE CHRISTIAN DOCTRINE OF DISCOVERY, MANIFEST DESTINY, AND A RELIGION OF SUBJUGATION
… Thoreau articulates a religion of "preservative care" that seeks to address past wrongs while nurturing sustained peace, which makes his outlook significant for the present.</p> <p> This vision of life filled with sustained peace, however, does not circumvent a serious reexamination …
-
Effects of environmental factors on wood decay micromorphology of Pinus radiata and Fagus sylvatica, and its significance for in-ground wood preservative performance
Wood preservatives are essential to the continued use of wood in situations where fungal decay and damage from wood boring insects such as termites, would otherwise occur. Significant risks to health and the environment arising from their correct use are unproven but new legislation and consumer …
-
Chemical and biological factors affecting the performance of CCA and ACA treated wood in soil
… the decay process, fixation and leachability of preservative elements and the role of lignin in the binding of nitrogen and preservative elements to wood.<br/><br/>Concentrations of surface nutrients, including nitrogen, present in CCA treated small blocks of both the hardwood lime (<i>Tllia …
-
Investigation of Bond Strength and Watertightness of Asphalt Concrete Wearing Surfaces for Timber Bridge Decks
… a preformed waterproofing membrane placed on a preservative treated wood deck overlaid with a bituminous concrete wearing surface. The second system consists of a treated wood deck overlaid with a base course of bituminous concrete, a waterproofing membrane, and a bituminous concrete wearing …
-
Using fungicides or combinations of fungicides to provide mold and decay fungal protection to OSB
… of fungicides (including some metal-containing preservatives) for enhancing the mold resistance of strandboard. During the second part of the study, preliminaryexperiments investigated the effectiveness of fungicides or combinations of fungicides using anagar-block test to estimate the …
-
A study on the application of synthetic antimicrobial peptides derived from plants for the reduction of yeast spoilage in food
… products intended for human consumption. Food preservatives and various preservation techniques that have been developed of decades within the food industry aim to slow the rate of food spoilage, therefore increasing the shelf-life of food products and control the level of food waste. Although …
-
The effect of bis(tributyltin) oxide on wood inhabiting microfungi
… is likely to accelerate the breakdown of the preservative inPinur* syIyesjjjA combination of antioxidant and preservative effects some reduction in breakdown suggesting that oxidative activity is, in part, responsible for such breakdown. Prelininary erperiments into the effect of long and …
-
Strengthening of timber beams using externally-bonded sprayed fibre reinforced polymers
… (Borocol) or oil borne (Creosote) antifungal preservative prior to being sprayed with FRP. Different combinations of adhesives/bonding agents including Hydroxymethylated Resorcinol and Polymeric Isocyanates were used to try to develop a strong bond. When considering using only chemical …
-
Bayesian and Frequentist Approaches for the Analysis of Multiple Endpoints Data Resulting from Exposure to Multiple Health Stressors.
… into a dimension reduction group and a dimension preservative group. Composite scores using desirability function is used, as a dimension reduction method, to evaluate neurotoxicity effects of a mixture of five organophosphate pesticides (OP) at a fixed mixing ratio ray, and five endpoints were …
-
Immobilisation of copper, chromium and arsenic on stabilised domestic refuse
… or Tanalith, and is classed as a waterborne wood preservative. Current global production of this class of chemicals is estimated at 90 000 tonnes annum-1 In South Africa (1988), the production of preservative treated wood approximates 430 000 m3annum-1 (UNEP, 1994). An experimental study to assess …
-
Comparison of ion chromatography and flow injection analysis methods for monitoring chlorite and chlorate ions in drinking water
… days when ethylene diamine was added as a preservative. Chlorate was stable in drinking water for up to eighteen days with or without a preservative. The propagation of errors method for determining detection limits yielded limits of detection for CIO₂- (mg/L) of 0.05 for FIA, 0.03 for the …
-
Studies on the oxidative degradation of fluphenazine decanoate in oily solution
… the acid. Benzyl alcohol is commonly added as a preservative to oily formulations and thus the effect of this material on the rate of fluphenazine decanoate oxidation was investigated. Evidence for the enhanced oxidation of the drug in the presence of benzyl alcohol in a naturally ageing …
Page 1 of 5