The Experts below are selected from a list of 264 Experts worldwide ranked by ideXlab platform
Jia Niu - One of the best experts on this subject based on the ideXlab platform.
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Production and use of DDT containing antifouling paint resulted in high DDTs residue in three paint factory sites and two Shipyard sites, China.
Chemosphere, 2011Co-Authors: Jia Xin, Lu Jiang, Jihua Wang, Xiang Liu, Wei Liu, Jia NiuAbstract:Abstract This study provides the first intensive investigation of Dichlorodiphenyltrichloroethanes (DDT) distribution in typical paint factories and Shipyards in China where DDT containing antifouling paint were mass produced and used respectively. DDTs were analyzed in soil, sludge and sediment samples collected from three major paint factories and two Shipyards. The results showed that the total DDTs concentrations detected in paint factory and Shipyard sites ranged from 0.06 to 8387.24 mg kg −1 . In comparison with paint factory sites, the Shipyard sites were much more seriously contaminated. However, for both kinds of sites, the DDTs level was found to be largely affected by history and capacity of production and use of DDT containing antifouling paint. (DDE + DDD)/DDT ratios indicated that DDT containing antifouling paint could serve as important fresh input sources for DDTs. It can be seen that most samples in Shipyards were in ranges where heavy contamination and potential ecological risk were identified.
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Production and use of DDT containing antifouling paint resulted in high DDTs residue in three paint factory sites and two Shipyard sites, China.
Chemosphere, 2011Co-Authors: Jia Xin, Lu Jiang, Jihua Wang, Xiang Liu, Wei Liu, Jia NiuAbstract:Abstract This study provides the first intensive investigation of Dichlorodiphenyltrichloroethanes (DDT) distribution in typical paint factories and Shipyards in China where DDT containing antifouling paint were mass produced and used respectively. DDTs were analyzed in soil, sludge and sediment samples collected from three major paint factories and two Shipyards. The results showed that the total DDTs concentrations detected in paint factory and Shipyard sites ranged from 0.06 to 8387.24 mg kg −1 . In comparison with paint factory sites, the Shipyard sites were much more seriously contaminated. However, for both kinds of sites, the DDTs level was found to be largely affected by history and capacity of production and use of DDT containing antifouling paint. (DDE + DDD)/DDT ratios indicated that DDT containing antifouling paint could serve as important fresh input sources for DDTs. It can be seen that most samples in Shipyards were in ranges where heavy contamination and potential ecological risk were identified.
Jia Xin - One of the best experts on this subject based on the ideXlab platform.
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Production and use of DDT containing antifouling paint resulted in high DDTs residue in three paint factory sites and two Shipyard sites, China.
Chemosphere, 2011Co-Authors: Jia Xin, Lu Jiang, Jihua Wang, Xiang Liu, Wei Liu, Jia NiuAbstract:Abstract This study provides the first intensive investigation of Dichlorodiphenyltrichloroethanes (DDT) distribution in typical paint factories and Shipyards in China where DDT containing antifouling paint were mass produced and used respectively. DDTs were analyzed in soil, sludge and sediment samples collected from three major paint factories and two Shipyards. The results showed that the total DDTs concentrations detected in paint factory and Shipyard sites ranged from 0.06 to 8387.24 mg kg −1 . In comparison with paint factory sites, the Shipyard sites were much more seriously contaminated. However, for both kinds of sites, the DDTs level was found to be largely affected by history and capacity of production and use of DDT containing antifouling paint. (DDE + DDD)/DDT ratios indicated that DDT containing antifouling paint could serve as important fresh input sources for DDTs. It can be seen that most samples in Shipyards were in ranges where heavy contamination and potential ecological risk were identified.
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Production and use of DDT containing antifouling paint resulted in high DDTs residue in three paint factory sites and two Shipyard sites, China.
Chemosphere, 2011Co-Authors: Jia Xin, Lu Jiang, Jihua Wang, Xiang Liu, Wei Liu, Jia NiuAbstract:Abstract This study provides the first intensive investigation of Dichlorodiphenyltrichloroethanes (DDT) distribution in typical paint factories and Shipyards in China where DDT containing antifouling paint were mass produced and used respectively. DDTs were analyzed in soil, sludge and sediment samples collected from three major paint factories and two Shipyards. The results showed that the total DDTs concentrations detected in paint factory and Shipyard sites ranged from 0.06 to 8387.24 mg kg −1 . In comparison with paint factory sites, the Shipyard sites were much more seriously contaminated. However, for both kinds of sites, the DDTs level was found to be largely affected by history and capacity of production and use of DDT containing antifouling paint. (DDE + DDD)/DDT ratios indicated that DDT containing antifouling paint could serve as important fresh input sources for DDTs. It can be seen that most samples in Shipyards were in ranges where heavy contamination and potential ecological risk were identified.
Nikša Fafandjel - One of the best experts on this subject based on the ideXlab platform.
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Additive manufacturing in compliance with lean manufacturing
2016Co-Authors: Damir Kolic, Richard Lee Storch, Nikša FafandjelAbstract:Additive manufacturing is used in multiple industries since its conceptual developments in the early 1980s to the present. The purpose of additive manufacturing is to further aid the manufacturing industry by decreasing the need to develop many specialized assembly lines, which are expensive to maintain and require economies of scale to be financially viable. The idea of lean manufacturing in shipbuilding is being applied in Shipyards around the world. The implementation of additive manufacturing well configures into a Shipyard economy by complying with the lean principles of one-piece flow and just in time. This paper will analyze where additive manufacturing could be applied to further aid a shipbuilding environment to become leaner. The hypothesis of the authors is that through the implementation of additive manufacturing there will be a significant reduction in the number of assembly lines as well as the number of suppliers that a Shipyard depends upon, thereby also reducing the lead time and delivering a vessel with fewer man-hours and a shorter duration time. This translates to lower overhead costs as well as increased profits for the Shipyard.
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Optimizing Shipyard Interim Product Assembly Using a Value Stream Mapping Methodology
2015Co-Authors: Damir Kolić, Richard Lee Storch, Nikša FafandjelAbstract:Value stream mapping is used to analyze and improve the production flow in many industries, which includes the airplane and automobile industries worldwide. The shipbuilding industry has adopted lean manufactureing techniques. However, the amount of value stream mapping application in the shipbuidling industry is still relatively sparse due to the large variety of interim products and ship types. The aim of this paper is to analyze the interim products of a typical sized commercial Shipyard with a product mix of chemical tankers and asphalt barges to demonstrate how a lean transformation can be performed using a Shipyard value stream mapping methodology. The case study maps the typcial panel assembly lines of the Shipyard and demonstrates the differences between the ship type interim products and using the lean manufacturing methodology developed by the authors to demonstrate how to define and adjust the production facilities using both lean and group technology techniques to create an improved production line which is demonstrated through a future improved value stream map. The main criteria for analyzing and comparing production improvement is through man-hours and duration time. The future value stream map has improvements of up to 50 percent, which demonstrates the importance of adopting a value stream mapping methodology for Shipyards aiming to improve world competivity by decreasing production costs, while maintaining and/or improving quality of the ship building blocks.
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transformation of advanced contract types for the shipbuilding industry with risk analysis
Brodogradnja, 2014Co-Authors: Damir Kolic, Richard Lee Storch, Nikša FafandjelAbstract:Summary Many Shipyards today contract vessels based on the traditional Lump Sum Fixed Price (LSFP) contract. Even though the construction of vessels from contract to delivery lasts from a year to longer, there are limited mechanisms available to mitigate for risk during the project evolution, especially in the case of prototype vessels, which are being built by the Shipyard for the first time and include much uncertainty with regards to project drawings, detailed material lists and man-hours. Shipbuilding is definitely a large engineering construction project (LECP). Therefore it is logical to analyse how LECPs are contracted and managed in other industries which successfully minimize contract risk and constantly ensure profit in its business. In this paper two new shipbuilding-contracting models are presented and applied in a generic case study of contracting the newbuilding of a prototype vessel. The Cost Plus Incentive Fee (CPIF) and the Cost Plus Fixed Fee (CPFF) contract models are demonstrated as improving the contracting process while yielding positive results for production, both in relation to the core capabilities of the Shipyard as well as the sub-contracted activities in vessel production. Likewise a product work breakdown structure PWBS is shown as the model for Shipyard business that very well complements the advanced contracting models. Finally a new contract risk analysis method using Monte Carlo simulation is developed to show how to practically analyse and compare the contracting methods in a case study so that Shipyard management could choose the contracting model with the least amount of risk.
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Lean Manufacturing Methodology for Shipyards
Shipbuilding, 2012Co-Authors: Damir Kolic, Nikša Fafandjel, Albert ZamarinAbstract:Many Shipyards today have made technological changes to their production facilities over the past decades. However, the building methodology has remained the same. Implementing a lean manufacturing approach to Shipyards requires analysis of the present Shipyard facilities. Likewise, the lean compliance level needs to be measured. After this, the steps for lean transformation are determined. In this work, a case study of a Shipyard with a traditional panel-block assembly process is transformed to a lean one which follows one piece fl ow. The integration of group technology, a product work breakdown structure (PWBS) and lean manufacturing yields optimal results illustrated through risk analysis. This is best demonstrated through the analysis of man-hours in assembling a typical shipbuilding block ready for erection.
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Lean manufacturing in shipbuilding with Monte Carlo simulation
2011Co-Authors: Damir Kolic, Richard Lee Storch, Nikša FafandjelAbstract:The shipbuilding industry is very competitive, and Shipyard management must strive to improve productivity as a way of keeping up with world competition. Analysis of the assembling of interim products through Shipyard process lanes is important from a standpoint of modern shipbuilding techniques and methods which includes the lean manufacturing and design for production concepts. Whereas the design for production concept has bean readily applied in many Shipyards, a lean manufacturing methodology for Shipyards is lacking. Therefore, the aim of this paper is to provide a methodology for improving the flow of interim products by applying the lean manufacturing concept. Since Shipyard management is usually not sure how to approach a transformation of its facilities due to the risks involved, this paper couples lean transformation with Monte Carlo simulation in applying the key parameter for comparing productivity, man-hours. The simulation involves process engineering transformation of an actual Shipyard’s panel-block assembly facilities. Application of the lean manufacturing methodology brings productivity improvements of 60%.
Wei Liu - One of the best experts on this subject based on the ideXlab platform.
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Production and use of DDT containing antifouling paint resulted in high DDTs residue in three paint factory sites and two Shipyard sites, China.
Chemosphere, 2011Co-Authors: Jia Xin, Lu Jiang, Jihua Wang, Xiang Liu, Wei Liu, Jia NiuAbstract:Abstract This study provides the first intensive investigation of Dichlorodiphenyltrichloroethanes (DDT) distribution in typical paint factories and Shipyards in China where DDT containing antifouling paint were mass produced and used respectively. DDTs were analyzed in soil, sludge and sediment samples collected from three major paint factories and two Shipyards. The results showed that the total DDTs concentrations detected in paint factory and Shipyard sites ranged from 0.06 to 8387.24 mg kg −1 . In comparison with paint factory sites, the Shipyard sites were much more seriously contaminated. However, for both kinds of sites, the DDTs level was found to be largely affected by history and capacity of production and use of DDT containing antifouling paint. (DDE + DDD)/DDT ratios indicated that DDT containing antifouling paint could serve as important fresh input sources for DDTs. It can be seen that most samples in Shipyards were in ranges where heavy contamination and potential ecological risk were identified.
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Production and use of DDT containing antifouling paint resulted in high DDTs residue in three paint factory sites and two Shipyard sites, China.
Chemosphere, 2011Co-Authors: Jia Xin, Lu Jiang, Jihua Wang, Xiang Liu, Wei Liu, Jia NiuAbstract:Abstract This study provides the first intensive investigation of Dichlorodiphenyltrichloroethanes (DDT) distribution in typical paint factories and Shipyards in China where DDT containing antifouling paint were mass produced and used respectively. DDTs were analyzed in soil, sludge and sediment samples collected from three major paint factories and two Shipyards. The results showed that the total DDTs concentrations detected in paint factory and Shipyard sites ranged from 0.06 to 8387.24 mg kg −1 . In comparison with paint factory sites, the Shipyard sites were much more seriously contaminated. However, for both kinds of sites, the DDTs level was found to be largely affected by history and capacity of production and use of DDT containing antifouling paint. (DDE + DDD)/DDT ratios indicated that DDT containing antifouling paint could serve as important fresh input sources for DDTs. It can be seen that most samples in Shipyards were in ranges where heavy contamination and potential ecological risk were identified.
Xiang Liu - One of the best experts on this subject based on the ideXlab platform.
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Production and use of DDT containing antifouling paint resulted in high DDTs residue in three paint factory sites and two Shipyard sites, China.
Chemosphere, 2011Co-Authors: Jia Xin, Lu Jiang, Jihua Wang, Xiang Liu, Wei Liu, Jia NiuAbstract:Abstract This study provides the first intensive investigation of Dichlorodiphenyltrichloroethanes (DDT) distribution in typical paint factories and Shipyards in China where DDT containing antifouling paint were mass produced and used respectively. DDTs were analyzed in soil, sludge and sediment samples collected from three major paint factories and two Shipyards. The results showed that the total DDTs concentrations detected in paint factory and Shipyard sites ranged from 0.06 to 8387.24 mg kg −1 . In comparison with paint factory sites, the Shipyard sites were much more seriously contaminated. However, for both kinds of sites, the DDTs level was found to be largely affected by history and capacity of production and use of DDT containing antifouling paint. (DDE + DDD)/DDT ratios indicated that DDT containing antifouling paint could serve as important fresh input sources for DDTs. It can be seen that most samples in Shipyards were in ranges where heavy contamination and potential ecological risk were identified.
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Production and use of DDT containing antifouling paint resulted in high DDTs residue in three paint factory sites and two Shipyard sites, China.
Chemosphere, 2011Co-Authors: Jia Xin, Lu Jiang, Jihua Wang, Xiang Liu, Wei Liu, Jia NiuAbstract:Abstract This study provides the first intensive investigation of Dichlorodiphenyltrichloroethanes (DDT) distribution in typical paint factories and Shipyards in China where DDT containing antifouling paint were mass produced and used respectively. DDTs were analyzed in soil, sludge and sediment samples collected from three major paint factories and two Shipyards. The results showed that the total DDTs concentrations detected in paint factory and Shipyard sites ranged from 0.06 to 8387.24 mg kg −1 . In comparison with paint factory sites, the Shipyard sites were much more seriously contaminated. However, for both kinds of sites, the DDTs level was found to be largely affected by history and capacity of production and use of DDT containing antifouling paint. (DDE + DDD)/DDT ratios indicated that DDT containing antifouling paint could serve as important fresh input sources for DDTs. It can be seen that most samples in Shipyards were in ranges where heavy contamination and potential ecological risk were identified.
