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1 |
Biomass supply chain equipment for renewable fuels production: A review
تجهیزات زنجیره تأمین زیست توده برای تولید سوخت های تجدیدپذیر: یک مروز-2021 The production of renewable fuels is a critical component of global strategies to reduce greenhouse gas (GHG) emissions. Moreover, the collection of raw materials for its production can provide added benefits such as reduction of wildfire risk, additional income for farmers, and decreased disposal costs. Although there is substantial literature on design and modeling of supply chains, the authors were unable to find a single reference with the information needed for the selection and cost estimation of each type of equipment involved in the supply chain. Therefore, the goal of this research is to gather information necessary for the construction and utilization of models that might drive the identification of a feasible supply chain to produce renewable fuels at a commercial scale. The primary objectives are to 1) understand the supply chain of critical feedstocks for renewable fuels production; 2) identify the equipment commercially available for collection and ad equation of feedstock; and 3) consolidate information regarding equipment cost, energy consumption, and efficiency, as well as feedstock storage and transportation systems. This paper provides a compilation for five feedstock types studied for sustainable aviation fuel production: 1) agricultural residues and grasses, 2) forest residues, 3) urban wood waste, 4) oilseeds, 5) fats, oils & greases. All the technologies involved from the field to the gate of the preprocessing or conversion unit were reviewed. The information on fats, oils & greases supply chains and equipment purposely designed for forest thinning and pruning was very limited. Keywords: Feedstock | Collection and adequation | Biofuels | Renewable fuels | Sustainable aviation fuel | Supply chain configuration |
مقاله انگلیسی |
2 |
Optimal Configuration of Assembly Supply Chains Based on Hybrid Augmented Lagrangian Coordination in an Industrial Cluster
پیکربندی بهینه زنجیره تامین مجمع بر اساس همبستگی لاگرانژی پیشرفته ترکیبی در یک گروه صنعتی-2017 Industrial cluster is becoming an ever more important cost-effective industry
development mode especially when enterprises are required to give more rapid responses
to the frequently changed customized demands. The explosive number of homogeneous
enterprises/suppliers with geographic proximity provides multiple options for each supply
chain stage, which thus leads to higher potential to form a more satisfactorily performed
assembly supply chain (assembly system) in industrial clusters. However, the increased
candidate options also incur inevitably higher decision complexity to the decision model
of configuring such cluster supply chains (CSC). The situation may be more challenging
if the autonomous decision requirement of individual suppliers is accommodated. A
general assembly cluster supply chain configuration (ACSCC) model is established which
considers both horizontally and vertically collaborations in a cluster, meaning it
accommodates the typical cluster relationships including subcontracting and outsourcing.
In order to achieve the complexity reduction and autonomy protection, a newly emerged
decomposition-based solution method named augmented Lagrangian coordination (ALC)
will be adopted. Especially, two classical ALC formulation variants named the centralized
coordination formulation and the distributed coordination formulation are innovatively
integrated to form a hybrid ALC solution strategy, which deals with different assembly
branches with different alliancing structures. Experimental results have proved the
effectiveness of the proposed hybrid ALC method for ACSCC problem. From the
perspective of supply chain management, a set of sensitivity analysis for profit of each
collaborative enterprise is conducted to obtain some important managerial insights.
Key words: Industrial Cluster| Supply chain configuration | Supplier selection |Multidisciplinary design optimization| Hybrid Augmented Lagrangian coordination. |
مقاله انگلیسی |
3 |
Selecting food process designs from a supply chain perspective
انتخاب طرح های فرایند مواد غذایی از منظر زنجیره تامین-2017 The food industry can convert agro-materials into products using many alternative process designs. To
remain competitive, companies have to select the design leading to the best supply chain performance.
These designs differ in the technologies used and the product portfolio produced. Additionally, charac
teristics, such as seasonal production and quality decay of food products, lead to specific requirements
regarding processing, transportation and storage. The importance of these characteristics of the food
industry on process design selection is investigated using sugar beet processing as an illustrative case.
The characteristics are included in a multi-period, multi-product location-allocation model. The model
shows that a supply chain perspective leads to changes in process design selection. The design with the
best portfolio value and processing costs does not lead to the best supply chain performance. This shows
the importance of a chain perspective to avoid sub-optimization in food process design selection.
Keywords: Food industry | Product portfolio | Process design | Facility location | Supply chain configuration | Optimization |
مقاله انگلیسی |
4 |
Closed-loop supply chain configuration for new and reconditioned products: An integrated optimization model
پیکربندی زنجیره تامین حلقه بسته برای محصولات جدید و تعویض شده: یک مدل بهینه سازی یکپارچه-2017 Closed-Loop Supply Chain Management (CLSCM) is considered as a strategic response to the call for cor
porate sustainability while further expanding the scope of value creation to include product reconstruction.
The Closed-Loop Supply Chain (CLSC) performance is directly related to the CLSC network design. The CLSC
network design, with long-term and strategic connotations, involves selection of an integrated network of
partner organizations to be engaged on one hand in the forward supply chain processes relevant to families
of existing and new products and also involved in reverse supply chain activities relevant to reconstruction
of the returned products. At the tactical level, Closed-Loop Supply Chain Configuration (CLSCC) attempts to
address issues pertinent to launch of a new product and its reconstruction. The CLSC network design is
well studied in the current literature, but addressing the CLSCC is neglected. To study the CLSCC problem
we: (a) develop an integrated optimization model for problem; (b) present a real-world case study of a
battery manufacturer; (c) based on the case study, we conduct a comprehensive set of computational
experiments followed by a series of what-if analyses to compare profitability of the Forward Supply Chain
Configuration (FSCC) versus the CLSCC; and (c) discuss the key observations and managerial implications
drawn from the computational experiments, applicable to other real-world instances. The significant
outcomes of the study suggest that: (i) performance of the firms base case integrated CLSCC model is
significantly better than the current supply chain model (ii) the sales-price ratio of new battery is found to
be negatively related with the maximum acquiring price of used batteries; (iii) combination of sales price
ratios of new and reconditioned batteries determines the total net profit for a given return rate. Finally,
important managerial insights and scope for future research are discussed.
Keywords: Operations management | Marketing | Case study | Product life cycle | Production planning and control |Mathematical programming |
مقاله انگلیسی |