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Economics of Gypsum Production in Iran
Abdoulkarim Esmaeili
Journal of Applied Sciences , 2008,
Abstract: The purpose of this research is to analyze the economics of gypsum production in Iran. The trend in production cost, selling price and profit are used to investigate economics of gypsum production. In addition, the multivariate time series method is used to determine factors affecting gypsum price in domestic market. The results indicated that due to increase in production and inflation, profitability of gypsum production has decreased during recent years. It is concluded that tariff and non-tariff barriers on mines machinery are among reasons for increasing production cost in Iranian gypsum mines. Decreasing such barriers could increase profitability of gypsum production in Iran.
Valuation of irrigation water in South-western Iran using a hedonic pricing model
Abdoulkarim Esmaeili,Zahra Shahsavari
Applied Water Science , 2011, DOI: 10.1007/s13201-011-0015-0
Abstract: Population growth, improved socioeconomic conditions, increased demand for various types of water use, and a reduction in water supply has created more competition for scarce water supplies leveling many countries. Efficient allocation of water supplies between different economic sectors is therefore very important. Water valuation is a useful tool to determine water price. Water pricing can play a major part in improving water allocation by encouraging users to conserve scarce water resources, and promoting improvements in productivity. We used a hedonic pricing method to reveal the implicit value of irrigation water by analyzing agricultural land values in farms under the Doroodzan dam in South-western Iran. The method was applied to farms in which irrigation water came from wells and canals. The availability of irrigation water was one of the most important factors influencing land prices. The value of irrigation water in the farms investigated was estimated to be $0.046 per cubic meter. The estimated price for water was clearly higher than the price farmers currently pay for water in the area of study. Efficient water pricing could help the sustainability of the water resources. Farmers must therefore be informed of the real value of irrigation water used on their land.
Efficiency Analysis of Fishery in Hamoon Lake: Using DEA Approach
Abdoulkarim Esmaeili,Mohamad Omrani
Journal of Applied Sciences , 2007,
Abstract: The aim of this study was to estimate technical, allocative and economical efficiency of selected fishermen in Hamoon Lake southeastern of Iran. Dataset applied in the study included cross sectional data that obtained from 74 questionnaires, completed among Sistanian fishermen in 2004. DEA approach is applied in this study. The use of the DEA index is free of distributional and production related assumptions in its derivations and is therefore not subject to the same potential for bias. The average technical efficiency of selected sample, using DEA approach, was calculated 82.7%. These figures for allocative and economic efficiencies were 75.5 and 62.7%, respectively. In addition, two components of technical efficiency including net technical efficiency and scale efficiency were calculated. Regarding that economic inefficiency results from both technical and allocative inefficiencies, so the harvests will perform economically efficient by rising technical and allocative efficiencies. Although, differences in efficiency among vessels were small in this study, vessels which their skippers participated in extension classes and those who did not have financial problem were more efficient. In addition, bigger capacity vessels technically and economically were more efficient.
The Effects of Intermodality on Transport Routes Choice from West African Ports to Landlocked Countries  [PDF]
Bomboma Kalgora, Hamadou Tahirou Abdoulkarim, Bodjrenou Kossivi
Open Journal of Social Sciences (JSS) , 2019, DOI: 10.4236/jss.2019.75001
Abstract: The paper studied 5 transport corridors in West Africa, from the ports of Abidjan, Cotonou, Lagos, Lomé, and Tema, to the landlocked countries (LLCs) of Burkina Faso, Mali, and Niger. The study found 15 transport routes available from these ports to the LLCs. It used two modes of transport with their respective transport costs as variables influencing shippers in their choice of corridor route. In regards to the modes of transport, the study chose the unimodal road transport and the intermodal transport as the combination of the rail and road transport, with a projection of the cargo volume demand in 2023 from the LLCs. In addition, a survey conducted on the Togolese corridor with the aim to find from users’ perspective the adequate intermodal terminal location, identified the city of Mango as an ideal host. As for the transport cost analysis attached to each of the modes of transport, the results of this study revealed that in the case of the unimodal road transport, shippers from Burkina Faso would rather choose Tema port in Ghana as optimal route, while shippers from Mali would rather choose Abidjan port in Ivory Coast, and shippers from Niger would choose Cotonou in Benin as the optimal route. Consequently, the study also found that the added parameter of the intermodal terminal of Mango on the Togolese corridor would change the routing habit of the LLCs shippers. In fact, with this parameter in line, the Togolese corridor would be optimal in terms of transport cost minimization for the Niger and Burkina Faso shippers. Based on these findings the study highlights the benefits of the intermodality which it presents to the policymakers.
Simulation of Dynamic Response of Small Wind-Photovoltaic-Fuel Cell Hybrid Energy System  [PDF]
Saeid Esmaeili, Mehdi Shafiee
Smart Grid and Renewable Energy (SGRE) , 2012, DOI: 10.4236/sgre.2012.33027
Abstract: Renewable energy systems are of importance as being modular, nature-friendly and domestic. Among renewable energy systems, a great deal of research has been conducted especially on photovoltaic effect, wind energy and fuel cell in the recent years. This paper describes dynamic modeling and simulation results of a small wind-photovoltaic-fuel cell hybrid energy system. The hybrid system consists of a 500 W wind turbine, a photovoltaic, a proton exchange membrane fuel cell (PEMFC), ultracapacitors, an electrolyzer, a boost converter, controllers and a power converter that simulated using MATLAB solver. This kind of hybrid system is completely stand-alone, reliable and has high efficiency. In order to minimize sudden variations in voltage magnitude ultracapacitors are proposed. Power converter and inverter are used to produce ac output power. Dynamics of fuel-cell component such as double layer capacitance are also taken into account. Control scheme of fuel-cell flow controller and voltage regulators are based on PID controllers. Dynamic responses of the system for a step change in the electrical load and wind speed are presented. Results showed that the ability of the system in adapting itself to sudden changes and new conditions. Combination of PV and wind renewable sources is made the advantage of using this system in regions which have higher wind speeds in the seasons that suffers from less sunny days and vice versa.
Effectiveness Life Review on Life Satisfaction among Adolescents under the Supervision of Qazvin Well-Being Center  [PDF]
Masoomeh Esmaeili, Ahmad Usefynezhad
Open Journal of Psychiatry (OJPsych) , 2016, DOI: 10.4236/ojpsych.2016.61001
Abstract: Objective: The aim of this study was to determine Effectiveness Life Review on Life Satisfaction among Adolescents under the Supervision of Qazvin Well-being Center 2012-2013. Method: This study was a quasi-experimental research including experimental and control groups with a pretest-posttest design. The statistical population consisted of all 12 - 18 years old male students who were nurtured in Qazvin Well-being Center, among whom 16 individuals were selected through applying purposive sampling method and were randomly divided into experimental and control groups with equal number of subjects. The investigation was done using Diener’s (1985) Satisfaction with Life Scale (SWLS) Questionnaire. The experimental group received life review therapyin 6 sessions (90 minutes per session). Data were analyzed by using Analysis of Covariance(ANCOVA), using SPSS software. Results: Results indicated that life review therapywas effectivein increasing male adolescents’ life satisfaction living in the welfare center. Conclusion: Life review therapy improves quality of life and life satisfaction; therefore, this treatment can be used as an effective method to improve the living conditions of young people.
Anisotropic Behavior of Cosmological Models with Exponential and Hyperbolic Scale Factors  [PDF]
Fakhereh Md. Esmaeili
Journal of High Energy Physics, Gravitation and Cosmology (JHEPGC) , 2018, DOI: 10.4236/jhepgc.2018.42017
Abstract: In this paper, the cosmological models of the universe are constructed in \"\" gravity with choice of the functional \"\" in the form \"\"?and \"\" . The space-time considered here is Bianchi Type I and the energy momentum tensor is in the form of perfect fluid. Two cosmological models are presented using a power form of exponential function and a hyperbolic form. The energy conditions along with the state finder diagnostic pair have been obtained and analyzed.
Dynamics of Bianchi I Universe in Extended Gravity with Scale Factors  [PDF]
Fakhereh MD. Esmaeili
Journal of High Energy Physics, Gravitation and Cosmology (JHEPGC) , 2018, DOI: 10.4236/jhepgc.2018.44040
Abstract: In this paper, the dynamical behavior of an anisotropic universe in an extended gravity e.g. the f (R,T ) theory of gravity is studied. We use f (R,T ) = R + 2μT , where R is the Ricci scalar, T is the trace of energy-momentum tensor and μ is a constant. Two cosmological models are constructed using the power law expansion and hybrid law cosmology in Bianchi type I universe, where the matter field is considered to be a perfect fluid. It is found that in both the cases the anisotropic behavior is in agreement with the observational results. The state finder diagnostic pair and energy conditions are also calculated and analyzed.
Prosumption and Web 2.0 Challenges Faced by African Countries Users  [PDF]
Seydou Harouna Fatouma, Shen Lei, Hamadou Tahirou Abdoulkarim
Open Journal of Social Sciences (JSS) , 2016, DOI: 10.4236/jss.2016.47020
Abstract: In recent years worldwide boundaries have been redefined, thanks to internet and technologies which facilitate increasingly the interaction between virtual friends and socials networking users. Consumers as well as producers in both developed and developing countries share information, pictures and videos via the Web 2.0 tools available on electronic devices and Internet websites. However due to several obstacles, activities such as co-creations, digital collaboration and others socials networking can be limited for some users. Thus this article discussed various factors that limit developing countries’ prosumers interactivity in the age of Web 2.0 technology. The factors influencing numbers of users’ collaboration can be individual, organizational, technological and/ or environmental factors.
Dry Ports in China and West Africa: A Comparative Study  [PDF]
Hamadou Tahirou Abdoulkarim, Seydou Harouna Fatouma, Elijah Musango Munyao
American Journal of Industrial and Business Management (AJIBM) , 2019, DOI: 10.4236/ajibm.2019.93030
The dry port concept was first adopted in Europe and North America, followed by Asia, South America and then Africa. Since then, the development of inland cargo distribution facilities has been an active approach to support the hinterlands of maritime gateways among other functions. Dry ports can be developed in the hinterland based on different approaches, involving differing functions, actors, motivations and logistical models. They can be classified as close, mid-range or distant, with respect to the seaport. Dry port development can be carried out by port authorities, port terminal operators and transport providers such as third-party logistics providers or rail operators or by public bodies: local, national or regional. One of the design strategies for these facilities is rail-based which promotes economies of scale on high capacities and long distance links. The other strategy is the road-based short-distance satellite terminals aimed at decongesting the port or facilitating faster custom clearances. This paper carries out a comparative analysis of dry ports in China and the West African countries using a descriptive approach and providing case studies for each parameter used in the comparative study. This study is based on motivations for dry port development in these regions, as well as the development and management models applied in the dry port sector. In addition, a discussion on the merits and demerits of the management and development models applied on dry ports in these regions are also included in this study, from which conclusions and recommendations are drawn to support policy formulation and future studies. This paper not only serves to contribute to the existing academic knowledge on dry ports, but also provides the policy makers and practitioners in the logistics and trade sectors with an invaluable opportunity to compare the practices in the two regions for application to appropriate scenarios.
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