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347 articles for “COP”
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Research ArticleOpen accessEvery word in the titleStudy on Infrared PbS Detector Prepared Using Copper Electrodes of Printed Circuit BoardHariyadi Soetedjo, Gunawan S. Prabowo, Darsono BahrunCopper layers of Printed Circuit Board (PCB) have been used as electrodes for PbS infrared structure detector to introduce low cost and simple in preparation. PbS deposition as an active layer detector has been prepared for a few micrometers in thickness using an evaporation technique under vacuum pressure at 10-6 Torr. Photoconductivity phenomenon has been observed from the measurement when … …American Journal of Applied Sciences, Vol. 10, Issue 6 · 11 Jun 2013 · 6,566 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleDyeability and Mechanical Properties of Acrylonitrile-Diallylamine Salts CopolymersAbir S. Abdel-Naby, Salha N. Al-HarthiThe dyeability of Acrylonitrile-Diallylamine Acetate (AN-DAA acetate) and Acrylonitrile-Diallylguanidine Acetate (AN-DAGA) copolymers have been studied with both conventional and ultrasonic methods. The results obtained were compared to the parent polyacrylonitrile. The effect of dye concentration, dye bath pH, dyeing time and temperature were studied and the results obtained by dyeing with both techniques were compared. Color strength values were found … …American Journal of Applied Sciences, Vol. 10, Issue 5 · 31 May 2013 · 6,561 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleAbolishing Toxicity of Copper by Some Environmental Factors Using Green Alga Chlorella vulgarisAdel A. Fathi, Mohamed M. Azooz, Mohamed A. Al-FredanA variety of environmental factors are known to modify the toxicity of heavy metals on algae. This study was undertaken to examine the impact of some inorganic and organic complexes on the toxicity of copper using the isolated algal species (Chlorella vulgaris). The data illustrate that the amount of available forms of copper (copper free ions) gradually decreased with increasing … …American Journal of Environmental Sciences, Vol. 8, Issue 6 · 2 Jan 2013 · 6,757 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleEffect of Gestation and Maternal Copper on the Fetal Fluids and Tissues Copper Concentrations in SheepAbd Elghany Hefnawy, Jorge Tortora-Perez, Saad Mohamed Shousha, Seham Youssef AbuKoraProblem statement: Samples of allantoic, amniotic fluid, fetal liver, kidney, maternal plasma and liver were collected from 30 ewes and classified into either early or late gestation and copper concentrations were measured. Approach: The Cu concentrations in the maternal plasma, allantoic, amniotic fluid, fetal liver and kidney increased significantly (p<0.01) during late gestation while maternal liver Cu decreased significantly (p<0.01). … …American Journal of Animal and Veterinary Sciences, Vol. 6, Issue 2 · 20 Sep 2011 · 7,466 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleDamage Pattern and Nesting Characteristic of Coptotermes curvignathus (Isoptera: Rhinotermitidae) in Oil Palm on PeatWei-Hong Lau, Choon-Fah J. Bong, Seow-Phan ChanThe oil palm industry of Malaysia has expanded into peat area in Sarawak. Problem statement: The subterranean termite Coptotermes curvignathus was a serious pest of oil palm on peat. Control of this termite has resorted to heavy usage of chemicals which was deemed uneconomical and hostile to the environment. Baiting system has inconsistent success due to the limited knowledge of … …American Journal of Applied Sciences, Vol. 8, Issue 5 · 17 May 2011 · 8,657 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleHandling the Dependence of Claim Severities with Copula ModelsYulia Resti, Noriszura Ismail, Saiful Hafizah JaamanProblem statement: Several studies have been carried out on the modeling of claim severity data in actuarial literature as well as in insurance practice. Since it is well established that the claim cost distributions generally have positive support and are positively skewed, the regression models of Gamma and Lognormal have been used by practitioners for modeling claim severities. However, the … …Journal of Mathematics and Statistics, Vol. 6, Issue 2 · 30 Jun 2010 · 7,528 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleEvaluation of Metarhizium anisopliae var. anisopliae (Deuteromycotina: Hyphomycete) Isolates and their Effects on Subterranean Termite Coptotermes curvignathus (Isoptera: Rhinotermitidae)Pik-Kheng Hoe, Choon-Fah J. Bong, Kadir Jugah, Amartalingam RajanProblem statement: Coptotermes curvignathus (Isoptera: Rhinotermitidae) is a common termite pest found in oil palm plantation planted on peat. Currently, the control methods focus on using insecticides that lead to high cost and adverse effect to the environment. Approach: Biological control like the use of entomopathogens provides an alternative control method for termite infestation problem. However, several factors need to … …American Journal of Agricultural and Biological Sciences, Vol. 4, Issue 4 · 31 Dec 2009 · 10,542 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleA Study on Potentiality of Carbon Storage and CO2 Uptake in the Biomass and Soil of Coppice StandA. Khademi, S. Babaei, A. MatajiProblem statement: Enhancing carbon storage in terrestrial ecosystems, especially in the forests, is a key factor in maintaining the atmosphere's carbon balance. With regard to the importance of forest in carbon sequestration, this study attempted to investigate the carbon storage potential and CO2 uptake in oak coppice stand. Approach: After combining slope, aspect and hypsometric maps, the number of land … …American Journal of Environmental Sciences, Vol. 5, Issue 3 · 30 Jun 2009 · 6,921 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleComparative Studies of the Determination of Divalent Cadmium, Lead and Copper in the Boiling Medicinal Herbs by Stripping Voltammetry and by Atomic Absorption SpectrometryAhmed Hassan, Jamal A. MayoufCadmium, lead and copper were determined in ten Libyian boiling medicinal herbs samples by differential pulse anodic stripping voltammetry as well as by atomic absorption spectrometry. Voltammetric method was done at Hanging Mercury Dropping Electrode (HMDE) in Briton-Robinson buffer solution of pH ~2.1 at 25± 0.1°C. The sample preparation was carried out by boiling 2.0g of a finely pulverized plant … …American Journal of Applied Sciences, Vol. 6, Issue 4 · 30 Apr 2009 · 7,029 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleProtective Effects of Covalent Cross-Linking on Proteolysis of Human Coproporphyrinogen Oxidase and Implications for PorphyriaAhmed W. Jafri, Jason R. Stephenson, Justin B. Morgenthaler et al.The effects of covalent cross-linkers on the enzyme, coproporphyrinogen oxidase, had been previously studied but their role in protecting the enzyme from protease cleavage has not been evaluated. Therefore, we examined how the cross-linker bis (sulfosuccinimidyl) suberate (BS3) affects the ability of trypsin to digest purified, wild type recombinant human coproporphyrinogen oxidase and selected mutants. Following incubation, the apparent molecular … …American Journal of Biochemistry and Biotechnology, Vol. 4, Issue 4 · 31 Dec 2008 · 6,687 accessesView PDFCite