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Research ArticleOpen accessIn the abstractDisjoint Sets in Graphs and its Application to Electrical NetworksFord Lumban GaolProblem statement: One of the well known problems in Telecommunication and Electrical Power System is how to put Electrical Sensor Unit (ESU) in some various selected locations in the system. Approach: This problem was modeled as the vertex covering problems in graphs. The graph modeling of this problem as the minimum vertex covering set problem. Results: The degree covering set … …Journal of Mathematics and Statistics, Vol. 7, Issue 1 · 25 Mar 2011 · 7,617 accessesView PDFCite
Research ArticleOpen accessIn the abstractEvaluation of Hevea brasiliensis (Latex Timber Clone: RRIM 2001 and RRIM 3001) in Relation to Different Water StressShafar Jefri Mokhatar, Wan Noordin Daud, Nursyazwina Md ZamriAbstract: Problem statement: Rubber, Hevea brasiliensis, has been traditionally planted in the humid tropics, which is characterized by high rainfall throughout the year. However, due to an increase in world’s demand for rubber, future planting will be established in dry areas, characterized by prevalence water stress. Utilizing limited resource, in dry areas or to use water wisely is very important. … …American Journal of Agricultural and Biological Sciences, Vol. 6, Issue 1 · 31 Jan 2011 · 10,906 accessesView PDFCite
Research ArticleOpen accessIn the abstractGlomalin Production and Microbial Activity in Soils Impacted by Gypsum Mining in a Brazilian Semiarid AreaAdalia Cavalcanti do Espírito Santo Mergulhao, Helio Almeida Burity, Fabio Sérgio Barbosa da Silva et al.Problem statement: Mining activities involve the removal of the vegetal cover and the soil organic layer, causing a severe environmental impact. In Northeast Brazil, 40% of the world’s crude gypsum is found in a semiarid area, making this region responsible for 95% of the gypsum demand in the national market. Although economically important, this activity is harmful to the environment. … …American Journal of Agricultural and Biological Sciences, Vol. 5, Issue 4 · 11 Nov 2010 · 9,023 accessesView PDFCite
Research ArticleOpen accessIn the abstractSummarizing Spatial Distribution Density, Movement Patterns and Food Resources to Study the Impacts of Logging and Forest Conversion on Orang-utan PopulationRaymond Alfred, Koh Pei Hue, Lee Shan Khee, Rayner AlfredProblem statement: Orang-utan is classified as a totally protected species and is listed as an endangered species in Borneo. The survival of this species is highly dependent on the existence and quality of the lowland forest of Sabah. However, most of the pristine habitats in the lowland area have been converted into other land use activities such as a large … …OnLine Journal of Biological Sciences, Vol. 10, Issue 2 · 31 Oct 2010 · 8,184 accessesView PDFCite
Research ArticleOpen accessIn the abstractForest Policy Impact Assessment in the Ouachita National Forest and the Valuation of Conserving Red-Cockaded WoodpeckersDifei Zhang, Michael M. Huebschmann, Thomas B. Lynch, James M. GuldinProblem statement: The Ouachita National Forest received approval in 1996 for an amendment to its Forest Plan that would allocate 10% of the Forest to long-rotation silviculture. The purpose of the new management area is to restore pre-European settlement forest conditions and recreate habitat for the endangered red-cockaded woodpecker. Approach: This study explored the effects of restoring an ecosystem, from … …American Journal of Applied Sciences, Vol. 7, Issue 10 · 31 Oct 2010 · 7,118 accessesView PDFCite
Research ArticleOpen accessIn the abstractUptake of Heavy Metals by Jatropha curcas L. Planted in Soils Containing Sewage SludgeParisa Ahmadpour, Azmi Mat Nawi, Arifin Abdu et al.Problem statement: The chemical pollution of soil has become a major source of concern and has posed serious health problems within the last few years in many developed nations. A variety of organic and inorganic pollutants, including heavy metals, are being mixed in with the cultivated soil and water. Sewage sludge was one of the major sources of enrichment of … …American Journal of Applied Sciences, Vol. 7, Issue 10 · 31 Oct 2010 · 10,265 accessesView PDFCite
Research ArticleOpen accessIn the abstractEvaluating Toxicity of Extracted Destruxin from Metarhizium Anisopliae Against Citrus Leafminer, Phyllocnistis citrellaM. Mohammadi Sharif, A. R. Hadizadeh, M.A. Tajick GhanbaryProblem statement: The fungus, Metarhizium anisopliae (Metschnikoff) Sorokin produces some cyclic peptide toxins, destruxins, which exhibit a variety of insecticidal actions. Citrus leafminer, Phyllocnistis citrella Stainton, is a major pest of young citrus trees; therefore its effective and safe control is a important issue. Approach: Five isolates of M. anisopliae were inoculated in Potato Dextrose Broth (PDB) mediums. Destruxin was … …American Journal of Environmental Sciences, Vol. 6, Issue 4 · 31 Aug 2010 · 7,251 accessesView PDFCite
Research ArticleOpen accessIn the abstractImpact Assessment and Utilization of Eastern RedcedarSalim Hiziroglu, Difei ZhangProblem statement: The fast invasion of eastern redcedar (Juniperus virginiana L.) has been considered a significant problem to the environment and rural communities. Approach: This study examined the adverse ecological and economic impacts of eastern redcedar and proposed the sustainable development of value-added panel products from such under-utilized invasive species. Also what economic sectors were mostly influenced was examined. Additionally … …American Journal of Applied Sciences, Vol. 7, Issue 8 · 31 Aug 2010 · 7,007 accessesView PDFCite
Research ArticleOpen accessIn the abstractComparative Evaluation of Phone Duration Models for Greek Emotional SpeechAlexandros Lazaridis, Vasiliki Bourna, Nikos FakotakisProblem statement: In this study we cope with the task of phone duration modeling for Greek emotional speech synthesis. Approach: Various well established machine learning techniques are applied for this purpose to an emotional speech database consisting of five archetypal emotions. The constructed phone duration prediction models are built on phonetic, morphosyntactic and prosodic features that can be extracted only … …Journal of Computer Science, Vol. 6, Issue 3 · 31 Mar 2010 · 7,065 accessesView PDFCite
Research ArticleOpen accessIn the abstractAntibacterial Activity of Hydroalcoholic Extract of Callistemon citrinus and Albizia lebbeckSeyyed Mansour Seyydnejad, Masumeh Niknejad, Ismaieel Darabpoor, Hossein MotamediProblem statement: Callistemon citrinus and Albizia lebbeck are two kind of native plants in Khoozestan province in Iran, according to the agreement that medicinal plant could be replaced the medicine we are trying to determine the antibacterial effect of the named plants. Approach: The antibacterial properties of ethanolic and methanolic extract of Callistemon citrinus leaf and Albizia lebbeck leaf was … …American Journal of Applied Sciences, Vol. 7, Issue 1 · 31 Jan 2010 · 9,077 accessesView PDFCite