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Search Results: 1 - 10 of 456 matches for " Armen 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.
Determinants of patient satisfaction with ophthalmic services
Hossain Ziaei, Marzieh Katibeh, Armen Eskandari, Monir Mirzadeh, Zahra Rabbanikhah, Mohammad Javadi
BMC Research Notes , 2011, DOI: 10.1186/1756-0500-4-7
Abstract: Clients of ophthalmic services were selected by systematic random sampling. Overall satisfaction was measured as the primary outcome using a validated patient satisfaction questionnaire (PSQ-18). Different domains were evaluated using PSQ-18 (technical quality, interpersonal manner, communication, financial aspects, time spent for patients, convenience and accessibility); an additional domain, physical setting of the hospital, was evaluated by complementary questions. A general linear model was used to assess the adjusted impact of each quality dimension on the overall satisfaction. Accessibility and technical quality had the strongest association with the overall satisfaction. This regression model could predict an overall satisfaction of 60%.In comparable settings, if care providers wish to improve the quality of health services from a patients' perspective, they should give priority to improving accessibility and technical quality. Further studies are recommended to discover complementary predictors in formation of overall satisfaction.Some parts of this article are translated form Farsi originally published in Bina Journal of Ophthalmology. (2009; 14 (3): 289-297). The original work is at: http://binajournal.org/index.php/bina/article/view/96 webcite.Research on patient satisfaction with medical care can be tracked to the late 1960s [1]. Initially, researchers focused on patient satisfaction as an intermediate condition in order to reach desirable clinical outcomes such as patient compliance with recommended treatment [2]. Gradually, patient satisfaction was shifted to a final outcome for evaluating and improving health and care services [3].Different instruments have been used to measure satisfaction [4-12]. Studies dealing with patient satisfaction are not homogenous and more studies are needed to ascertain the best technique for measuring quality of health care services and the importance of various predictors on overall satisfaction. In addition, little info
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 $n\geq3$.
New Design & Build Biological System through the Use of Microalgae Addressed to Sustainable Development  [PDF]
Armen B. Avagyan
Journal of Environmental Protection (JEP) , 2010, DOI: 10.4236/jep.2010.12023
Abstract: Current trends in energy consumption and biofuel manufacturing are neither secure nor sustainable, because they are not provided by necessary cost effective technologies. Further reductions of cost and technological development will be needed for biofuels to be able to compete effectively without subsidy. With the debate raging about raw material of biofuel, microalgae may offer a solution to this conundrum; creating enormous reserves of biofuels and boosting feed production. In this goal Center suggest projects, which incorporate water recourse management and restoration of lakes, freshwater conservation and cleanup through cost effective biodiesel manufacturing as well as pharmaceuticals destruction through the use of microalgae Chlorella and wastewaters aimed to replace the burning technology includes also supplying biofuel profitably and developed pilot bussiness plan based on the cost effective technology through applying new innovative approaches in various stages of microalgae production. The benefits of microalgae are so overwhelming that this, combined with the prospect of the improvement in nature protection, makes it imperative for the world to devise an international response and a plan of action. Incentives will be needed for the development of industry-led platforms such as the World Microalgae Technology Platform and its international financial fund. Microalgae must be the key tool for the new design and building sustainable development and environment management.
New Design of Biopharmaceuticals through the Use of Microalgae Addressed to Global Geopolitical and Economic Changes. Are You Ready for New Development in Biopharma?  [PDF]
Armen B. Avagyan
Pharmacology & Pharmacy (PP) , 2010, DOI: 10.4236/pp.2010.11005
Abstract: The Biopharma industry is enduring sweeping change in response to the financial crisis, but one aspect of the in-dustry that emerged relatively unscathed and that perhaps has directly benefited from the crisis is new revolutionary innova- tion solution. Identifying opportunities in the next wave of technologies for Biopharma, along with other policy initia- tives including financial crisis actions and climate policy, will affect on manufacturing biopharmaceutical products today and in the future in cost effective manner, and will be our adequate answer addressing to global geopolitical, economic and climate changes. It also underscores the search for new approach, evidenced by trends around new for- mulations to serve lower income patients. Microalgae biomass comes in many strains, and can be used by means of variety product developments. In the last years the key task of our R & D was to find a solution for these tasks. The bio- fuel market development dynamics include significant opportunity of microalgae raw material and microalgae proc- essing biomass rest of biodiesel manufacturing for Biopharma global growth in cost effective manner. Second new source of microalgae raw material for Biopharma include microalgae production through waste and wastewater cleaning. This should provide the opportunity to see the future in a new vision, where technology can serve as a revela- tion of the truth and where every endeavor is governed by reflection on and appreciation of the environment and thus leading to resolution of global tasks facing the world community and inclusion of microalgae in production and bio cycles open new cost effective ways for Biopharma companies and conservation of nature. A truly coherent microalgae raw material and Biopharma production policy has to find ways to bring these two traces closer for cost effective manufacturing, well being Biopharma economy and human health.
Correlations between delayed fluorescence of chlorophyll, metabolism and yield of plants. II. Influence of moisture of leaf and temperature condition on delayed fluorescence of leaves  [PDF]
Armen B. Avagyan
Journal of Biophysical Chemistry (JBPC) , 2010, DOI: 10.4236/jbpc.2010.11006
Abstract: During various temperatures of incubation the dehydration of leaves up to 3.2-3.8% mainly in-duced increase maximum amplitude of delayed fluorescence of chlorophyll. It was shown that moisture loss with this range could be deter-mined for the most part by the growth of the electrochemical potential of thylakoid mem-branes. The further incubation of detached leaves at 36℃ temperature, with more notable moisture loss, resulted in specific its decline as opposed to cases of 22 and 6℃ of thermal in-cubation. It was confirmed that the increased temperatures and moisture loss damage of the cells of plants occurred together induce a greater influence on plants than in case of oc-curring apart. The results allow to suppose that this can be mostly caused weakly associated polypeptides fallen out from the chloroplast membrane, which may be stipulated by high temperature combined with change ionic and osmotic stresses due moisture loss. Simulta-neously, the results showed that the exposure of the critical lowered air temperature led to considerable typical changes of leaves delayed fluorescence parameters of field plants. There-fore, their use can constitute new approaches to elucidate the molecular basis of plant freezing tolerance in a timely manner, based on concen-tration-related changes and the efficiency of coupling between light and dark processes of plants.
Correlations between delayed fluorescence of chlorophyll, metabolism and yield of plants. I. Influence of fertilizers on correlations  [PDF]
Armen B. Avagyan
Journal of Biophysical Chemistry (JBPC) , 2010, DOI: 10.4236/jbpc.2010.11005
Abstract: The increase of the potash fertilizer dose in-duced a raise in efficiency influence of the ni-trogen fertilizer, optimisation of phosphorous fertilizer effect, enhancement of leaf protein production, expansion of assimilating surface and yield growth. In the period of yield forma-tion, the parameters of delayed fluorescence of chlorophyll (DF) of leaf wholly corresponded with key factors that had a dramatic influence on the effectiveness of yield formation. The maximum level of DF amplitude mostly de-pended on the activity of nitrogen metabolism and presumably on active PSII concentration changes per square unit. Half-decay time of this amplitude was predominantly identified by the level of carbohydrate metabolism in the overall plant system, including the quantity of its products and, therefore, mostly by correspon-dence with yield. This is a biological base trig-gering the use of DF parameters for system analyses of plant production process.
Correlations between delayed fluorescence of chlorophyll, metabolism and yield of plants. III. Influence of viral infection on field plants and new technology of clone selection of virus-free planting potato  [PDF]
Armen B. Avagyan
Journal of Biophysical Chemistry (JBPC) , 2010, DOI: 10.4236/jbpc.2010.11007
Abstract: At the end of potato plants vegetation virus in-fection induced both decrease in maximum amplitude of delayed fluorescence maximal amplitude and increase half time of its decrease, as well as reduction in the amount of stems, plants’ height and assimilation area surface, yield, acceleration of plants development and their early die-off. The differences of DF pa-rameters and yields between strongly and weakly infected plants increase in case of a combined virus infection. In industrial test of the selection of virus-free planting potato by the use of DF parameter, a rise in the yield and de-crease degree of viral infection of crops was obtained.
Theory of Global Sustainable Development Based on Microalgae in Bio and Industrial Cycles, Management-Changing Decisions in Areas of Climate Change and Waste Management  [PDF]
Armen B. Avagyan
Journal of Sustainable Bioenergy Systems (JSBS) , 2013, DOI: 10.4236/jsbs.2013.34038
Abstract:

The paper provides requested management-changing decisions through implementation of conclusions of Global Sustainable Development theory based on including of microalgae in Bio and Industrial Cycles in the area of waste-related management challenges within creating market opportunities for industry through expansion of resource efficiency use across global supply chains and new design and building sustainable development with contemporary manufacturing of value added products. A truly coherent waste management and other production policy (biofuel, biopharmaceuticals, food, feed and perfumery additives) and mitigation of Climate Change are ways to bring these traces closer to cost effective manufacturing, improving of resource efficiency use, well being economy and human health. Offered technological change dramatically increase biomass feedstock resources, reduce waste origin of greenhouse emission (since 13%-17%), organics sent to landfill, pyrolyses, etc. and create a model that all elements along the waste value chain create economic, societal and/or environmental value.

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