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Research ArticleOpen accessEvery word in the titleHair Lead Bio-Monitoring Among School Children in the Province of Cavite, PhilippinesJanet P. Macawile, Glenn L. Sia SuAirborne lead is one of the pressing environmental problems that cause neuropsychological impairments to people who are exposed to it. In assessing people’s exposure to airborne lead, bio-monitoring techniques has been used as an indicator of chemical exposure. This study aims to determine the hair lead concentrations among school children in the province of Cavite and compare the hair lead … …American Journal of Environmental Sciences, Vol. 8, Issue 6 · 22 Jan 2013 · 7,034 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleComparison of Two Analytical Techniques For Lead Determination in Soils and Mosses SamplesAlbert Maxhuni, Pranvera Lazo, Musaj PaqariziThe aim of this study was to compare the results of the lead levels obtained by two different techniques in the soil and mosses samples taken from the entire territory of the Republic of Kosovo. The atmospheric deposition of lead through the biomonitoring technique was done for the first time in Kosovo by using quartz tube flame Atomic Absorption Spectroscopy … …American Journal of Environmental Sciences, Vol. 8, Issue 4 · 22 Jun 2012 · 6,897 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleElectrical Properties of Novel Lead Zirconate/Synthetic Rubber Composite MaterialsChareumwut Pansa-Ard, Yanee Pornchaisiriarun, Nuchnapa TangboriboonProblem statement: Perovskite lead zirconate exhibits in an orthorhombic formation at a temperature below the Curie temperature, TC. Approach: The orthorhombic is non-centrosymmetric which is capable of spontaneous polarization (electronic, ionic and orientation), depending on their composition and volume fraction. Results: The results from FTIR spectroscopy, XRD patterns, and SEM indicate that the lead zirconate particles are dispersed in Acrylic … …Energy Research Journal, Vol. 2, Issue 2 · 20 Feb 2012 · 7,589 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleConstrained Probabilistic Economic Order Quantity Model under Varying Order Cost and Zero Lead Time Via Geometric ProgrammingKotb Abd-El-Hamid Mahmoud Kotb, Huda Mohamed Hamid Al-ShanbariProblem statement: In this study, we provide a simple method to determine the inventory policy of probabilistic single-item Economic Order Quantity (EOQ) model, that has varying order cost and zero lead time. The model is restricted to the expected holding cost and the expected available limited storage space. Approach: The annual expected total cost is composed of three components (expected … …Journal of Mathematics and Statistics, Vol. 7, Issue 4 · 3 Nov 2011 · 7,612 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleDetermination of Lead in Human Teeth by Hydride Generation Atomic Absorption SpectrometryHassan T. AbdulsahibProblem statement: The determination of lead in human teeth at concentration levels of μg/ml is proposed using Hydride Generation Atomic Absorption Spectrometry (HG-AAS). To do this, 2% (wv) lanthanum chloride solution was employed as matrix modifying reagent to increase sensitivity and remove matrix interferences. Approach: About 100 μL of sample and 100 μL of 3.0% (m/v) NaBH4 are simultaneously injected … …American Journal of Environmental Sciences, Vol. 7, Issue 5 · 31 Oct 2011 · 7,133 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleAssessment of Lead and Cadmium Content in the Soils and Plants in Industrial AreaGabriela Oprea, Cristina Mihali, Angela Michnea et al.Problem statement: The objective of this research was to assess the degree of soil pollution and also of Plant contamination with lead (Pb) and cadmium (Cd) in Baia Mare city (located in NW Romania) area which used to be one of the most important nonferrous metallurgical centers in Romania. Approach: Soil and plant samples were collected from 3 districts of … …American Journal of Environmental Sciences, Vol. 7, Issue 5 · 31 Oct 2011 · 7,251 accessesView PDFCite
Research ArticleOpen accessEvery word in the titlePeriodic Review Probabilistic Multi-Item Inventory System with Zero Lead Time under Constraint and Varying Holding CostNaglaa Hassan El-SodanyProblem statement: This study treats the probabilistic safety stock n-items inventory system having varying holding cost and zero lead-time subject to linear constraint. Approach: The expected total cost is composed of three components: the average purchase cost; the expected order cost and the expected holding cost. Results: The policy variables for this model are the number of periods N*r and … …Journal of Mathematics and Statistics, Vol. 7, Issue 1 · 29 Jan 2011 · 7,524 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleLead Free Solder Joint Thermal Condition in Semiconductor PackagingM. Najib Harif, Allina Nadzri, Kamaruzaman JusoffProblem statement: Solder joints are responsible for both electrical and mechanical connections. Solder does not have adequate ductility to ensure the repeated relative displacements due to the mismatch between expansion coefficients of the chip carrier and the circuit board. Solder material plays a crucial role to provide the necessary electrical and mechanical interconnections in an electronic assembly. Finding a technique … …American Journal of Applied Sciences, Vol. 7, Issue 7 · 31 Jul 2010 · 7,160 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleLead and Cadmium Availability and Uptake by Rice Plant in Response to Different Biosolids and Inorganic FertilizersSeyed Majid Mousavi, Mohammad Ali Bahmanyar, Hemmatollah PirdashtiProblem Statement: Contents of heavy metals in soil are very important because soil is the first link in the food chain. Approach: But, pay attention to importance the subject, we performed this project to investigate the lead (Pb) and Cadmium (Cd) availability and uptake by rice plant in response to different biosolids Municipal Solid Waste (MSW), Vermicompost (VC) and inorganic … …American Journal of Agricultural and Biological Sciences, Vol. 5, Issue 1 · 31 Mar 2010 · 8,337 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