305 articles for “seven”

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Research ArticleOpen accessIn the abstractAssessment of Soil Solution Chemicals after Tannery Effluents DisposalCélia A. Surita, Thomas Gloaguen, Célia R. Montes, Carlos T.S. DiasKnowledge about soil solution chemicals is important for assessing their mobility, availability, migration to groundwater and toxicity to plants. The objective of this study was to apply factor analysis to data obtained on soil solution chemicals during a one-year monitoring program in a controlled experiment with tannery effluents disposed on the soil surface, to extract information on their relationship and … …American Journal of Applied Sciences, Vol. 4, Issue 12 · 31 Dec 2007 · 6,775 accessesView PDF Cite

Research ArticleOpen accessIn the abstractOptimal Parameter Tuning in a Predictive Nonlinear Control Method for a Mobile RobotD. Hazry, M. SugisakaThis study contributes to a new optimal parameter tuning in a predictive nonlinear control method for stable trajectory straight line tracking with a non-holonomic mobile robot. In this method, the focus lies in finding the optimal parameter estimation and to predict the path that the mobile robot will follow for stable trajectory straight line tracking system. The stability control contains … …American Journal of Applied Sciences, Vol. 3, Issue 4 · 30 Apr 2006 · 7,090 accessesView PDF Cite

Research ArticleOpen accessIn the abstractSome Fast Methods for Fitting Some One-parameter Spatial ModelsR. J. MartinIt is common in geographic modelling to use a one-parameter spatial model to specify the inverse covariance matrix in terms of I-βW, for some known matrix W. Exact Gaussian maximum likelihood estimation of β requires evaluation of the determinant of the covariance matrix. For large data sets, this evaluation of the determinant can be slow and good approximations can be … …Journal of Mathematics and Statistics, Vol. 1, Issue 4 · 31 Dec 2005 · 6,071 accessesView PDF Cite

Research ArticleOpen accessIn the abstractIndigenous Methods in Preserving Bush Mango Kernels in CameroonZac Tchoundjeu, Alain Rene Atangana, Ann DegrandeTraditional practices for preserving Irvingia wombolu and Irvingia gabonensis (bush mango) kernels were assessed in a survey covering twelve villages (Dongo, Bouno, Gribi [East], Elig-Nkouma, Nkom I, Ngoumou [Centre], Bidjap, Nko’ovos, Ondodo [South], Besong-Abang, Ossing and Kembong [Southwest]), in the humid lowland forest zone of Cameroon. All the interviewed households that own trees of species were found to preserve kernels … …American Journal of Applied Sciences, Vol. 2, Issue 9 · 30 Sep 2005 · 7,774 accessesView PDF Cite

Research ArticleOpen accessIn the abstractAssociation of Oral Contraceptives and Abnormal Pap SmearSayedmohsen Sayednozadi, Mohammadreza Hassany, Mohammad Arash RamezaniTo assess the hypothesis that combined Oral Contraceptive (OCs) increase the risk of cervical neoplasia, we conducted a multicenter Case-Control study in Mashhad, the capital of Khorasan province. Seventy-eight women with moderate to severe dysplasia at Pap smear as case group and one hundred fifty nine women with normal Pap smear were selected as the control group for evaluation. The … …American Journal of Applied Sciences, Vol. 2, Issue 7 · 31 Jul 2005 · 6,774 accessesView PDF Cite