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Search Results: 1 - 10 of 198077 matches for " N;Eskandari "
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Simpson’s Method for Solution of Nonlinear Equation  [PDF]
Hamideh Eskandari
Applied Mathematics (AM) , 2017, DOI: 10.4236/am.2017.87073
Abstract: The programs offered for solving nonlinear equations, usually the old method, such as alpha, chordal movement, Newton, etc. have been used. Among these methods may Newton’s method of them all be better and higher integration. In this paper, we propose the integration method for finding the roots of nonlinear equation we use. In this way, Newton’s method uses integration methods to obtain. In previous work, [1] and [2] presented numerical integration methods such as integration, trapezoidal and rectangular integration method that are used. The new method proposed here, uses Simpson’s integration. With this method, the approximation error is reduced. The calculated results show that this hypothesis is confirmed.
A Study of muon efficiency dependency on ion density in fusion of D-T and D-T-H mixtures and their comparison
M. R. Eskandari,S. N. Hoseini Motlagh
Iranian Journal of Physics Research , 1998,
A comparative Survey on the Effect of Enamel Matrix Protein in Treatment of Two Wall Intrabony Periodontal Defects (Alone or in Combination with Autogenous Bone Graft)
Journal of Dental Medicine , 2005,
Abstract: Statement of Problem: Regenerative periodontal procedures are one mode of therapy that attempts to restore the lost supporting structures of the dentition around a previously diseased root surface.Purpose: The purpose of this study was comparison between Enamel matrix proteins (EMP) used alone or in combination with autogenous bone graft (ABG) in the treatment of human intrabony periodontal defects.Materials and Methods: This clinical trial study, was done on 8 pairs of matched two wall intrabony periodontal defects with 5 mm or more probing depth and 3 mm or more depth of intrabony componentfollowing phase I therapy. In control sites Enamel matrix proteins (EMP) and in lest sites EMP with autogenous bone graft (ABG) was used.Results: No differences were found in terms of oral hygiene and defect characteristics, at baseline. Six months after treatment, both procedures significantly improved the clinical probing depth and clinical attachment level. Although bone fill was significant for both groups but EMP+ABG significantly showed more bone fill and defect resolution (bone fill 2.75mm versus 3.67mm). Crestal resorption was the same for both groups and its difference was not significant.Conclusion: The results of this study demonstrates that both procedures improves clinical parameters and combined use of EMP with autogenous bone graft will promote more bone fill and more defect resolution. A difficulty in obtaining sufficient amounts of autogenous bone from intra oral sites is one of the limitations ofthis procedure.
Muon cycling rate in D/T mixture including doubly muonic molecule formation
M. R. Eskandari,S. N. Hoseini-motlagh,B. Rezaie
Iranian Journal of Physics Research , 2002,
Abstract: In the present work, the fundamental behavior of four body molecule formations of pt μμ , pd μμ , dt μμ , tt μμ , and pp μμ in a D/T fusion are considered. Their higher fusion rate, specially the available data for dt μμ , encouraged us to study the muon cycling rate in D/T fusion in the temperature range of (100-1400 K), density and deuterium-tritium concentration ratio. For this purpose, various values for the doubly muonic molecule formation are chosen and with the comparison to the experimental results, the doubly muonic formation rate of 109 s-1 is predicted theoretically. Our calculated cycling rate has shown that having not considered the doubly muonic formation in previous calculations had made no serious changes in the previously calculated values.
Serological Study of Toxoplasma gondii Infection Using IFA Method in Renal Transplant Recipients
M Nateghi Rostami,E Eskandari,Z Garoosi,N Mohajeri
Iranian Journal of Parasitology , 2006,
Abstract: Toxoplasmosis is a wide distributed opportunistic infection caused by Toxoplasma gondii. This was a cross-sectional study of T. gondii antibody titer, which was conducted from June 2003 to August 2004 on renal transplant recipients in Iran. A total of 551 serum samples were obtained from randomly selected population referred from different areas all over the country to Shafa Central Clinic in Tehran. Patient’s information was recorded in a questionnaire before sampling. Two samples of finger-prick blood were collected from each person and antibody titer against Toxoplasma was assessed by Indirect Fluorescence Antibody (IFA) technique on serum samples. Totally 39 cases (7.1%) of samples were positive for antibody by the titer of 1: 20 and higher. On investigation of risk factors, no significant difference was found between consumption of under-cooked meat, close contact with animals, and the source of drinking water and seropositivity rate of toxoplasmosis. The relatively low seroprevalence rate of Toxoplasma infection shows the successful approaches to awareness of transplant recipients about the potential risks of acquisition of infectious diseases due to regular administration of suppressive drugs. However, the regular surveillance through serological screening of Toxoplasma antibody in kidney transplant recipients is advisable.
AEESPAN: Automata Based Energy Efficient Spanning Tree for Data Aggregation in Wireless Sensor Networks  [PDF]
Zahra ESKANDARI, Mohammad Hossien YAGHMAEE
Wireless Sensor Network (WSN) , 2009, DOI: 10.4236/wsn.2009.14039
Abstract: In Wireless Sensor Networks (WSNs), sensor nodes are developed densely. They have limit processing ca-pability and low power resources. Thus, energy is one of most important constraints in these networks. In some applications of sensor networks, sensor nodes sense data from the environment periodically and trans-mit these data to sink node. In order to decrease energy consumption and so, increase network’s lifetime, volume of transmitted data should be decreased. A solution, which is suggested, is aggregation. In aggrega-tion mechanisms, the nodes aggregate received data and send aggregated result instead of raw data to sink, so, the volume of the transmitted data is decreased. Aggregation algorithms should construct aggregation tree and transmit data to sink based on this tree. In this paper, we propose an automaton based algorithm to con-struct aggregation tree by using energy and distance parameters. Automaton is a decision-making machine that is able-to-learn. Since network’s topology is dynamic, algorithm should construct aggregation tree peri-odically. In order to aware nodes of topology and so, select optimal path, routing packets must be flooded in entire network that led to high energy consumption. By using automaton machine which is in interaction with environment, we solve this problem based on automat learning. By using this strategy, aggregation tree is reconstructed locally, that result in decreasing energy consumption. Simulation results show that the pro-posed algorithm has better performance in terms of energy efficiency which increase the network lifetime and support better coverage.
Algebraic Cycles and Extensions of Mixed Hodge Structures Arising from the Fundamental Group of a Punctured Curve
Payman Eskandari
Mathematics , 2015,
Abstract: Let $X$ be a smooth projective curve over $\mathbb{C}$, $\infty,p\in X(\mathbb{C})$, and $L_n$ be the mixed Hodge structure of functions on $\pi_1(X-\{\infty\},p)$ that can be expressed by iterated integrals of length at most $n$. In this paper we express the mixed Hodge extension $e^\infty_{n,p}$ arisen from the weight filtration on $\displaystyle{\frac{L_n}{L_{n-2}}}$ in terms of certain null-homologous algebraic cycles on $X^{2n-1}$. In the final section, we assume $X, p,\infty$ are over a subfield $k\subset\mathbb{C}$ and show that, one can associate to the extension $e^\infty_{n,p}$ a family of $k$-valued points on the Jacobian of $X$, parametrized by elements of $\text{CH}_{n-1}(X^{2n-1})$ defined over $k$. When $n=2$, the results are due to Darmon, Rotger and Sols. Our contribution is in generalizing the picture to $n\geq3$.
Study of Biological Methods in Landfill Leachate Treatment  [PDF]
Parna Eskandari Payandeh, Naser Mehrdadi, Parisa Dadgar
Open Journal of Ecology (OJE) , 2017, DOI: 10.4236/oje.2017.79038
Abstract: Landfill leachate is mainly the result of precipitation of water into the layers of buried waste, and biochemical reactions of waste that has dangerous substances and pollutants that lead to the contamination of surface and groundwater resources. Therefore, it must be collected and treated properly. The investigation of various biological methods in leachate treatment, their advantages and disadvantages, and their effect on reduction of COD (chemical oxygen demand) are the objectives of this study. Reviewed processes include anaerobic and aerobic sequencing batch reactor, up-flow anaerobic sludge blanket, moving-bed biofilm reactor, membrane bioreactor, and aerated lagoons, lead to reduction of biodegradability pollutants in different circumstances. The present study has indicated that the most and the least reduction of COD has been through aerated lagoon (95%) and moving-bed biofilm reactor (8%), respectively.
Preparation and in vitro characterization of chitosan nanoparticles containing Mesobuthus eupeus scorpion venom as an antigen delivery system
Mohammadpour Dounighi, N;Eskandari, R;Avadi, MR;Zolfagharian, H;Mir Mohammad Sadeghi, A;Rezayat, M;
Journal of Venomous Animals and Toxins including Tropical Diseases , 2012, DOI: 10.1590/S1678-91992012000100006
Abstract: hydrophilic nanoparticles have been widely investigated in recent years as delivery systems for therapeutic macromolecules such as antigens. in the present study mesobuthus eupeus venom-loaded chitosan nanoparticles were prepared via ionic gelation of tripolyphosphate (tpp) and chitosan. the optimum encapsulation efficiency (91.1%) and loading capacity (76.3%) were obtained by a chitosan concentration of 2 mg/ml, chitosan-to-tpp mass ratio of 2 and m. eupeus venom concentration of 500 μg/ml. the average nanoparticle size at optimum conditions was determined by zetasizer (malvern instruments, uk). the nanoparticle size was about 370 nm (polydispersity index: 0.429) while the zeta potential was positive. transmission electron microscope (tem) imaging showed a spherical, smooth and almost homogenous structure for nanoparticles. fourier transform infrared (ftir) spectroscopy confirmed tripolyphosphoric groups of tpp linked with ammonium groups of chitosan in the nanoparticles. the in vitro release of nanoparticles showed an initial burst release of approximately 60% in the first ten hours, followed by a slow and much reduced additional release for about 60 hours. it is suggested that the chitosan nanoparticles fabricated in our study may provide a suitable alternative to traditional adjuvant systems.
Interactions of distinct quadrupolar nematic colloids
Z. Eskandari,N. M. Silvestre,M. Tasinkevych,M. M. Telo da Gama
Physics , 2012,
Abstract: The effective interaction between spherical colloids in nematic liquid crystals is investigated in the framework of the Landau-de Gennes theory. The colloids differ through their interaction with the nematic. While both particles induce quadrupolar far-field distortions in the nematic matrix, with unlike quadrupole moments, one favours homeotropic and the other degenerate planar anchoring of the nematic director. In the strong anchoring regime the colloids with homeotropic anchoring are accompanied by an equatorial disclination line defect, known as "Saturn-ring", while the colloids with degenerate planar anchoring nucleate a pair of antipodal surface defects, called "Boojums". In the linear (large-distance) regime the colloidal interactions are of the quadrupolar type, where the quadrupoles have opposite signs. These are attractive when the colloids are aligned either parallel or perpendicular to the far-field director. At short distance, non-linear effects including "direct" interactions between defects give rise to a repulsion between the particles, which prevents them from touching. This finding supports the stability of nematic colloidal square crystallites the assembly of which has been reported recently.
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