Browsing by Publisher "Pergamon-Elsevier Science Ltd"
Now showing items 1-20 of 32
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A framework for water and carbon footprint analysis of national electricity production scenarios
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Publisher and Date:(Pergamon-Elsevier Science Ltd, 2017)While carbon footprint reduction potential and energy security aspects of renewable and non-renewable resources are widely considered in energy policy their effects on water resources are mostly overlooked. This research aims to develop a framework for water and carbon footprint analysis to estimate the current and future trends of water consumption and withdrawal by electricity production sectors for national energy development plans - alongside carbon emissions from various electricity sources. ...
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A historical assessment of Turkey's natural gas import vulnerability
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Publisher and Date:(Pergamon-Elsevier Science Ltd, 2018)This article aims at evaluating the historical determinants and implications of Turkey's natural gas import dependency. We implement principle component analysis (PCA) methodology to construct a natural gas import vulnerability index (NGIVI) for the period between 1986 and 2014 using five factors: (1) the share of natural gas in primary energy consumption (2) the share of natural gas in primary energy imports (3) the non-diversification of natural gas import sources (4) the share of LNG in total ...
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A hybrid approach to concept selection through fuzzy analytic network process
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Publisher and Date:(Pergamon-Elsevier Science Ltd, 2009)Evaluating conceptual design alternatives in a new product development (NPD) environment has been one of the most critical issues for many companies which try to survive in the fast-growing world markets. Therefore most companies have used various methods to successfully carry out this difficult and time-consuming evaluation process. Of these methods analytic hierarchy process (AHP) has been widely used in multiple-criteria decision-making (MCDM) problems. But in this study we used analytical ...
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A re-configuring sliding-mode controller with a ustable robustness
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Publisher and Date:(Pergamon-Elsevier Science Ltd, 2004)In this paper a controller design method for underwater vehicles is presented which is based on re-configuration of a sliding-mode controller in case of disturbances caused by shallow water conditions. The disturbance distribution information can be obtained and used to update the corrective gain vector of the sliding-mode controller. This increases the robustness of the controller and hence keeps the system performance within acceptable limits. Proposed method is validated with simulations on a ...
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Bidding of price taker power generators in the deregulated Turkish power market
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Publisher and Date:(Pergamon-Elsevier Science Ltd, 2013)In deregulated power markets power firms bid into the day-ahead power market either with buy offers or sell offers. The auction mechanism and competition determine the equilibrium price and quantity for each hour. If the bid price of a company is below the market clearing price then the offer of the company is accepted and rewarded with the market price. A company can be a price maker or price taker depending on the capacity it offers to the market. A price-taker unit must determine the right offer ...
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Can law impose competition? A critical discussion and evidence from the Turkish electricity generation market
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Publisher and Date:(Pergamon-Elsevier Science Ltd, 2014)Electricity markets have undergone regulatory reforms since the early 1980s around the world. Technical analyses of these reforms usually pay lip service to the influence of politics over regulatory processes. Existing studies examine certain aspects of the market such as demand pricing and efficiency and they touch upon political issues only passingly when economic models cannot provide sufficient explanation This approach problematically takes politics as an ad hoc variable. This study shows ...
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Competing frameworks of Islamic law and secular civil law in Turkey: A case study on women's property and inheritance practices
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Publisher and Date:(Pergamon-Elsevier Science Ltd, 2015)The article stems from empirical research conducted with a group of women living in Istanbul who have conservative life styles bounded by an Islamic worldview. It attempts to illuminate the negotiation and contestation between the official civil law and Islamic law. The findings demonstrate that women inherit and bequeath property in a social setting where their gender roles are defined by their adherence to Islam. We argue that in Turkey women's inheritance practices are not determined solely in ...
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Computing trade-offs in robust design: Perspectives of the mean squared error
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Publisher and Date:(Pergamon-Elsevier Science Ltd, 2011)Researchers often identify robust design as one of the most effective engineering design methods for continuous quality improvement. When more than one quality characteristic is considered an important question is how to trade off robust design solutions. In this paper we consider a bi-objective robust design problem for which Pareto solutions of two quality characteristics need to be obtained. In practical robust design applications a second-order polynomial model is adequate to accommodate the ...
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Cosmic ray intensity variation during a CME
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Publisher and Date:(Pergamon-Elsevier Science Ltd, 2002)The June 6 2000 coronal mass ejection was an exceptional full halo which made it possible to measure cosmic ray (CR) decrease with a simple experimental set-up. Variation in the local secondary cosmic ray density has been investigated by means of gamma rays. The experiment site was located in Istanbul (41.1N 29.0E). CR electrons and slow gamma rays have been eliminated. The CR density has dropped drastically starting on June 8 2000. The counts have been compared with the pre-shock levels and some ...
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Derivation of the optical constants of spin coated CeO2-TiO2-ZrO2 thin films prepared by sol-gel route
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Publisher and Date:(Pergamon-Elsevier Science Ltd, 2011)Ternary thin films of cerium titanium zirconium mixed oxide were prepared by the sol-gel process and deposited by a spin coating technique at different spin speeds (1000-4000 rpm). Ceric ammonium nitrate ce(NO3)(6)(NH4)(2) titanium butoxide Ti[O(CH2)(3)CH3](4) and zirconium propoxide Zr(OCH2CH2CH3)(4) were used as starting materials. Differential calorimetric analysis (DSC) and thermogravimetric analysis (TGA) were carried out on the CeO2-TiO2-ZrO2 gel to study the decomposition and phase transition ...
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Docking studies on monoamine oxidase-B inhibitors: Estimation of inhibition constants (K-i) of a series of experimentally tested compounds
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Publisher and Date:(Pergamon-Elsevier Science Ltd, 2005)Monoamine oxidase (EC1.4.3.4
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Ethnic fractionalization conflict and educational development in Turkey
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Publisher and Date:(Pergamon-Elsevier Science Ltd, 2019)We examine the impact of ethnic fractionalization and conflict on limiting the educational development in Southeastern Turkey. Our estimates show that although the armed conflict in the region did not directly hinder education investments it reduced school enrolment rates at middle and high school levels while increasing enrolment at the primary school level. Moreover we show that provinces with higher percentages of Kurdish population received less education investment. These results suggest that ...
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A heuristic approach for allocation of data to RFID tags: A data allocation knapsack problem (DAKP)
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Publisher and Date:(Pergamon-Elsevier Science Ltd, 2012)Durable products and their components are increasingly being equipped with one of several forms of automatic identification technology such as radio frequency identification (RFID). This technology enables data collection, storage, and transmission of product information throughout its life cycle. Ideally all available relevant information could be stored on RFID tags with new information being added to the tags as it becomes available. However, because of the finite memory capacity of RFID tags ...
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How is the Big Five related to moral and political convictions: The moderating role of the WEIRDness of the culture
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Publisher and Date:(Pergamon-Elsevier Science Ltd, 2019)There has been extensive research on how the Big Five personality traits are related to political orientation and endorsement of moral foundations. However, recent findings suggest that these relationships may not be cross-culturally stable. We argue that how much a culture is WEIRD (Western, educated, industrialized, rich, and democratic) could moderate how the Big Five is related to political and moral convictions. In a sample of 7263 participants from 30 countries, our results showed that the ...
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Investigation of transfusion transmitted viruses in cases clinically suspected of posttransfusion hepatitis with undetermined ethiology
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Publisher and Date:(Pergamon-Elsevier Science Ltd, 2002)Transfusion transmitted viruses (TTV) were investigated in cardiac surgery cases who were previously transfused with blood and/or blood products and were suspected of having posttransfusion hepatitis (PTH) based on the results of physical examination clinical findings biochemical blood test results and in a smaller number on radiological results. They were identified as having non-A-C hepatitis based on serological or molecular test methods. In this study out of 90 cases suspected for PTH and ...
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Leveraging saving-based algorithms by master-slave genetic algorithms
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Publisher and Date:(Pergamon-Elsevier Science Ltd, 2011)Saving-based algorithms are commonly used as inner mechanisms of efficient heuristic construction procedures. We present a general mechanism for enhancing the effectiveness of such heuristics based on a two-level genetic algorithm. The higher-level algorithm searches in the space of possible merge lists which are then used by the lower-level saving-based algorithm to build the solution. We describe the general framework and we illustrate its application to three hard combinatorial problems. ...
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Master problem approximations in Dantzig-Wolfe decomposition of variational inequality problems with applications to two energy market models
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Publisher and Date:(Pergamon-Elsevier Science Ltd, 2013)In this paper a modification to Dantzig-Wolfe (DW) decomposition algorithm for variational inequality (VI) problems is considered to alleviate the computational burden and to facilitate model management and maintenance. As proposals from DW subproblems are accumulated in the DW master problem the solution time and memory requirements are increasing for the master problem. Approximation of the DW master problem solution significantly reduces the computational effort required to find the equilibrium. ...
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A memetic random-key genetic algorithm for a symmetric multi-objective traveling salesman problem
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Publisher and Date:(Pergamon-Elsevier Science Ltd, 2008)This paper proposes a methodology to find weakly Pareto optimal solutions to a symmetric multi-objective traveling salesman problem using a memetic random-key genetic algorithm that has been augmented by a 2-opt local search. The methodology uses a target-vector approach" in which the evaluation function is a weighted Tchebycheff metric with an ideal point and the local search is randomly guided by either a weighted sum of the objectives or a weighted Tchebycheff metric. The memetic algorithm has ...
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Minimization of rest mismatches in round robin tournaments
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Publisher and Date:(Pergamon-Elsevier Science Ltd, 2018)In sports tournaments an occurrence of a difference in the rest periods of opponent teams in a game which we refer to as a rest mismatch will disadvantage the less rested team. Thus it is only fair to expect opposing teams to have rested equally before their game. In this work we introduce and study the Rest Mismatch Problem where the goal is to minimize the number of rest mismatches in a round robin tournament. Two integer linear formulations and a constraint programming formulation are provided ...
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Models for relief routing: equity efficiency and efficacy
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Publisher and Date:(Pergamon-Elsevier Science Ltd, 2012)In humanitarian relief operations vehicle routing and supply allocation decisions are critically important. Similar routing and allocation decisions are studied for commercial settings where efficiency in terms of minimizing cost is the primary objective. Humanitarian relief is complicated by the presence of multiple objectives beyond minimizing cost. Routing and allocation decisions should result in quick and sufficient distribution of relief supplies with a focus on equitable service to all aid ...