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2,278 articles for “K-factor”
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Research ArticleOpen accessEvery word in the titleNumerical Solution For Frank-Kamenetskii And Activation Energy Parameters in Reactive-Diffusive Equation with Variable One-Exponential FactorO. K. Koriko, A. J. OmowayeIn this study, we considered a steady state, exothermic chemical reaction, taking the diffusion of the reactant into account and assuming an Arrhenius temperature dependence with variable pre-exponent factor. Numerical solution is constructed for the governing nonlinear boundary value problem using finite difference scheme .The effect of Frank-Kamenetskii, activation energy parameter and pre-exponent factor on the temperature were also examined, … …Journal of Mathematics and Statistics, Vol. 3, Issue 4 · 31 Dec 2007 · 6,924 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleDesign of a Single-Phase Rectifier with Improved Power Factor and Low THD using Boost Converter TechniqueIsmail Daut, Rosnazri Ali, Soib TaibThe method of using Boost type of converter was proposed for a 300W single-phase rectifier in this paper. By designing the necessary techniques and methodology, the overall Power Factor (PF) and Total Harmonic Distortion would be improved to the expectation. The cause of having low PF and high THD for a diode-capacitor type of rectifiers is related to non-linearity of … …American Journal of Applied Sciences, Vol. 3, Issue 9 · 30 Sep 2006 · 7,132 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleA Low Cost Design Solution - DSP Based Active Power Factor Corrector for SMPS/ UPS( Single Phase)Samia Pillai Pitchai, B. UmamaheswariAs per international agency regulation (IEC 1000-3-2/EN 61000-3-2) and market expectation, it is important to reduce current harmonics in the AC line current drawn by SMPS/ UPS connected to AC Mains as source and also it is desired by the user to deliver maximum power output by achieving unity power factor. To achieve the above objectives in SMPS/ UPS, APFC … …American Journal of Applied Sciences, Vol. 3, Issue 1 · 31 Jan 2006 · 6,899 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleModeling and Simulation of a Novel Switched Reluctance Motor Drive System with Power Factor ImprovementG. Venkatesan, R. Arumugam, M. Vasudevan et al.This study presents a novel Switched Reluctance Motor (SRM) drive system with power factor improvement. Recently, many of the converters with variable speed drives have no input power factor correction circuits. This results in harmonic pollution of the utility supply, which should be avoided. The effect of power factor variation in terms of harmonic content is also analyzed in this … …American Journal of Applied Sciences, Vol. 3, Issue 1 · 31 Jan 2006 · 7,099 accessesView PDFCite
Research ArticleOpen accessEvery word in the titlePeriodontal Disease as a Risk Factor for Coronary Artery DiseaseGholamali Najafi-Parizi, Ahmad LoriThere are many risk factors for coronary artery disease (CAD) and periodontal disease (PDD) is a controversial risk factor. The aim of this study was to show the association between CAD and PDD. A case-control study was designed. Sixty one patients that CAD was confirm in them by coronary angiography compared with sixty one patients with normal angiography. PDD was … …American Journal of Applied Sciences, Vol. 2, Issue 11 · 30 Nov 2005 · 6,922 accessesView PDFCite
Review ArticleOpen accessEvery word in the titleThe Rainfall Factor of Climate Change Effects on the Agricultural Environment: A ReviewOlumuyiwa Idowu Ojo, Masengo Francois IlungaThe study of the climatic elements is vital for sustainable development of agriculture of a region. Particularly, rainfall temporal analyses for trends, fluctuations and periodicities are necessary as such can indirectly furnish the status of an environment. A trend may be quite instructive for different segments of the human and natural systems. Extreme weather events that can lead to events … …American Journal of Applied Sciences, Vol. 14, Issue 10 · 26 Oct 2017 · 8,338 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleCombination of Serological Tests (Anti-CCP Antibody, Rheumatoid Factor IgM ELISA and Latex Test) are more Useful in Detection of Rheumatoid ArthritisAnindya Das, Chimanjita Phukan, Chitralekha BaruahRheumatoid arthritis is a polyarticular and chronic inflammatory disease occurring throughout the world. To prevent significant joint damage, early diagnosis and proper treatment is of paramount importance. Though patients are diagnosed clinically supported by radiography and serological tests, early disease may present with non-specific arthritis and absence of specific radiographic findings. Though anti-CCP antibody is used for the diagnosis and … …American Journal of Immunology, Vol. 13, Issue 3 · 23 Sep 2017 · 7,393 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleEffect of Metformin Treatment on Inflammatory Factors and Gut Microbial Diversity in Patients with Type II Diabetes MellitusLei Tong, Jingjing Zhang, Li Xiao Yue et al.With the persistent rise in the prevalence of Type 2 Diabetes Mellitus (T2DM), traditional treatment evaluations have primarily focused on glycemic control, often overlooking the multidimensional effects of medications. As a first-line therapeutic agent, the anti-inflammatory effects and gut microbiota regulation mechanisms of metformin remain incompletely elucidated. This prospective cohort study established a metformin treatment group and a T2DM control … …American Journal of Biochemistry and Biotechnology, Vol. 22, Issue 2 · 20 Jul 2026 · 785 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleMultivariate Analysis of Gestational Diabetes Risk Factors in a North African Population: A Call for Targeted Maternal Health InterventionsHafssa Abdellaoui, Nadia Ouzennou, Adnane Hakem, Samia RkhaGestational Diabetes (GD) is a multifactorial condition influenced by demographic, anthropometric and obstetric determinants. Identifying predictive factors is essential to anticipate the disorder, guide prevention strategies and reduce maternal and neonatal complications. To assess the risk factors associated with GDM in pregnant women in the Marrakech-Safi region, in order to fill a gap in national data. A retrospective cross-sectional study … …OnLine Journal of Biological Sciences, Vol. 26, Issue 2 · 10 May 2026 · 1,536 accessesView PDFCite
Review ArticleOpen accessEvery word in the titleRole of Cytokines and Transcription Factors in Periodontitis: A Review of Cellular and Molecular MechanismsAnne Carolina Eleutério Leite, Valéria Martins de Araújo Carneiro, Júlia Faria Nunes et al.Periodontal Diseases (PD) are characterized by pathological manifestation of host immune response to bacterial infection at the tooth/gingival interface. Evidences points periodontitis as a risk factor for pathological systemic conditions, such as, cardiovascular diseases and diabetes. The identification of host factors that determine their susceptibility to immune subversion can provide useful information in the pathogenesis of periodontitis. Protective acute inflammatory … …American Journal of Immunology, Vol. 11, Issue 4 · 9 Dec 2015 · 7,809 accessesView PDFCite