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حرية الوصول المقاله
1 - An integrated inventory model with agile production rate, defective items, inflation, and green technology investments for deteriorating products
Nita Shah Pratik Shah Milan PatelThe paper analyses an inventory model for make-to-order policy from the customer to the dealer. The production rate is variable to meet customers’ demands in time and to control the emission of carbon units produced during the manufacturing process. The manufactur أکثرThe paper analyses an inventory model for make-to-order policy from the customer to the dealer. The production rate is variable to meet customers’ demands in time and to control the emission of carbon units produced during the manufacturing process. The manufacturing process is not perfect and produces defective items depending on the production rate. The dealer invests in green technology to reduce the number of carbon units produced during different stages of manufacturing and storage. Products are deteriorating in nature and their demand is influenced by the selling price of the product and green technology investments. The effect of inflation is also considered in various costs to carry out the study. First, a mathematical model is developed with given constraints and then elaborated with a numerical example. The objective is to find out the optimum values of production time, cycle time, green technology cost, and product selling price to maximize the dealer's total profit. The model is further analyzed to check the effect of marginal changes in inventory parameters on the decision variables and the results are used to study managerial insights. تفاصيل المقالة -
حرية الوصول المقاله
2 - A New Mathematical Model for the Green Vehicle Routing Problem by Considering a Bi-Fuel Mixed Vehicle Fleet
Neda Manavizadeh Hamed Farrokhi-Asl Stanley Frederick W.T. LimThis paper formulates a mathematical model for the Green Vehicle Routing Problem (GVRP), incorporating bi-fuel (natural gas and gasoline) pickup trucks in a mixed vehicle fleet. The objective is to minimize overall costs relating to service (earliness and tardiness), tr أکثرThis paper formulates a mathematical model for the Green Vehicle Routing Problem (GVRP), incorporating bi-fuel (natural gas and gasoline) pickup trucks in a mixed vehicle fleet. The objective is to minimize overall costs relating to service (earliness and tardiness), transportation (fixed, variable and fuel), and carbon emissions. To reflect a real-world situation, the study considers: (1) a comprehensive fuel consumption function with a soft time window, and (2) an en-route fuel refueling option to eliminate the constraint of driving range. A linear set of valid inequalities for computing fuel consumption were introduced. In order to validate the presented model, first, the model is solved for an illustrative example. Then each component of cost objective function is considered separately so as to investigate the effects of each part on the obtained solutions and the importance of vehicles speed on transportation strategies. Computational analysis shows that, despite the limitation of an appropriate service infrastructure, the proposed model demonstrated an average reduction of 44%, 6% and 5% in carbon emission costs, total distribution costs, and transportation costs respectively. Moreover, the study found paradoxical effects of average speed, suggesting the need to manage trade-offs: while higher speeds reduced service costs, they increased carbon emission costs. In the next stage, some experiments modified from the literature are solved. According to these experiments, in all instances greater objective function values for Gasoline vehicles are gained. The difference in the carbon emission objective is also significant, with an average of 44.23% increase. Finally, managerial and institutional implications are discussed. تفاصيل المقالة -
حرية الوصول المقاله
3 - عوامل تعیین‌کننده یارانه‌های سوخت در کشورهای منتخب صادرکننده نفت (مطالعه موردی: یارانه بنزین)
حسین توکلیان علی فریدزاد جلال دهنوی ندا محمدیچکیده هدف این مقاله بررسی عوامل موثر بر پرداخت یارانه سوخت فسیلی در کشورهای صادرکننده نفت است. بدین منظور، عوامل تعیین کننده یارانه های سوخت فسیلی در کشورهای منتخب صادرکننده به سه بخش عوامل اقتصادی، سیاسی و نهادی تقسیم بندی شده و با روش گشتاورهای تعمیم‌یافته داده های تا أکثرچکیده هدف این مقاله بررسی عوامل موثر بر پرداخت یارانه سوخت فسیلی در کشورهای صادرکننده نفت است. بدین منظور، عوامل تعیین کننده یارانه های سوخت فسیلی در کشورهای منتخب صادرکننده به سه بخش عوامل اقتصادی، سیاسی و نهادی تقسیم بندی شده و با روش گشتاورهای تعمیم‌یافته داده های تابلویی پویا طی دوره 2003- 2015 بررسی شده اند. نتایج نشان داد متغیرهای انتشار کربن و هزینه‌های بهداشتی در پرداخت یارانه بنزین موثر است. همچنین شاخص‌های راهنمای بینالمللی ریسک کشوری نیز نشان از تاثیر عوامل نهادی و سیاسی در پرداخت یارانه دارد. بر اساس نتایج، سازمان‌‌های بینالمللی و یا دستگا‌‌ه‌‌های مدیریتی باید سرمایه‌‌گذاری هدفمند و دقیقی در حوزه بهبود ظرفیت و توان نهادی و سازمانی کشورها داشته باشند. تفاصيل المقالة -
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4 - A New Weighted Goal Programming Technique to Solve Fully Triangular Intuitionistic Fuzzy Multi-Objective Fixed Charge Solid Transportation Problem
Awdhesh Bind Deepika Rani Kapil GoyalModern society depends substantially on transport because it allows for mobility and the movement of goods. However, it also has numerous negative effects on the environment and makes a major contribution to carbon emissions. Different vehicles use a variety of fuels to أکثرModern society depends substantially on transport because it allows for mobility and the movement of goods. However, it also has numerous negative effects on the environment and makes a major contribution to carbon emissions. Different vehicles use a variety of fuels to transmit energy in transportation systems. For energy communication, vehicles emit greenhouse gases that pollute the environment. Also, the parameters in transportation problems are not always precisely define rather are imprecise in nature in most cases. Recalling this fact, this paper explores the study of a multi-objective fully intuitionistic fuzzy fixed charge solid transportation problem considering carbon emission as an objective function. A new solution algorithm is developed to obtain the compromised optimal solution of the proposed model. Solved the proposed transportation problem models by using LINGO.19.0 optimization software and obtained the crisp as well as fuzzy objective values. A real-life-based numerical problem is presented and solved to validate the concept and the results are compared with other existing methods. تفاصيل المقالة -
حرية الوصول المقاله
5 - Conservation Tillage Can Reduce Energy Consumption and Carbon Emissions in the Production of Rainfed Sunflower
ZAYNOLABEDIN SHAMABADIZAYNOLABEDIN SHAMABADI*Department of Agricultural Engineering Research. Agricultural and Natural Resources Research center of Semnan (Shahrood). Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran*Corresponding author E Corresponding au أکثرZAYNOLABEDIN SHAMABADI*Department of Agricultural Engineering Research. Agricultural and Natural Resources Research center of Semnan (Shahrood). Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran*Corresponding author E Corresponding author E Corresponding author E Corresponding author ECorresponding author ECorresponding author ECorresponding author E Corresponding author ECorresponding author ECorresponding author ECorresponding author ECorresponding author ECorresponding author ECorresponding author ECorresponding author ECorresponding author ECorresponding author E-mail: mail: mail: mail: zshamabadi@gmail.comReceived: Received:Received:Received: Received:Received:Received: 23 June 201423 June 201423 June 201423 June 2014 23 June 201423 June 201423 June 201423 June 201423 June 201423 June 201423 June 2014 Accepted:Accepted:Accepted:Accepted:Accepted:Accepted: Accepted: 7 November 20147 November 20147 November 2014 7 November 20147 November 20147 November 20147 November 20147 November 20147 November 2014 7 November 20147 November 20147 November 20147 Abstract In order to assess the environmental impact of agricultural activity, the long-term sustainability should be considered. In order to achieve solutions to reduce energy consumption and carbon emissions in the production of rainfed sunflower, this assessment was conducted in the North East of Iran. Four production methods, i.e. conventional tillage (CT), tow reduced tillages (RT1and RT2) and direct seeding (NT) were evaluated. The highest energy consumption (12.3 GJ.ha-1) and carbon emissions (248 kg C-eq ha-1 and 155 kg C-eq t-1) were related to the conventional method. The least energy input (9.12 GJ ha-1) and carbon emission (183.3 kg C-eq ha-1 and 118.6 kg C-eq t-1), were related to NT method. The greatest amount of sustainability index (Is) was related to NT method, followed by RT2 (1.96), RT1 (1.79) and CT (1.53). In farm operations, fuel and nitrogen fertilizer were the key factors relating to energy use and carbon emission. In comparison of production methods, the conservation tillage was significantly more efficient. In conservation tillage, input energy and fuel consumption per hectare were 30% and 90% lower than conventional method, respectively, but there was no reduction in yield and energy output. Based on the lower power consumption and greater energy efficiency, conservation tillage methods (in particular, reduced tillage and no-tillage) was recommended to replace the conventional tillage. تفاصيل المقالة
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