The Experts below are selected from a list of 27399 Experts worldwide ranked by ideXlab platform
Jianbin Luo - One of the best experts on this subject based on the ideXlab platform.
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macroscale superlubricity enabled by the Synergy Effect of graphene oxide nanoflakes and ethanediol
ACS Applied Materials & Interfaces, 2018Co-Authors: Rui Luo, Chenhui Zhang, Jianbin LuoAbstract:Graphene has been recognized as an excellent lubrication material owing to its two-dimensional structure and weak interlayer interactions. However, most extant works concerning superlubricity involving graphene oxide have been limited to nanoscale or microscale dimensions (of the order of 1–10 μm). In present work, realization of a robust macroscale superlubricity state (μ = 0.0037), by taking advantage of the Synergy Effect of graphene-oxide nanoflakes (GONFs) and ethanediol (EDO) at Si3N4–SiO2 interfaces is reported. GONFs have been observed as being adsorbed on friction surfaces, thereby preventing direct contact between surface asperities. The extremely low shear stresses developed between these asperities contribute toward enhanced superlubricity and the resulting super-low wear. Meanwhile, the formation of partial-slip hydrodynamic boundary condition at the GONFs–EDO interface along with the formation of hydrated GONFs–EDO networks through hydrogen-bond interactions contribute to the generation of e...
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macroscale superlubricity enabled by the Synergy Effect of graphene oxide nanoflakes and ethanediol
ACS Applied Materials & Interfaces, 2018Co-Authors: Rui Luo, Chenhui Zhang, Jianbin LuoAbstract:Graphene has been recognized as an excellent lubrication material owing to its two-dimensional structure and weak interlayer interactions. However, most extant works concerning superlubricity involving graphene oxide have been limited to nanoscale or microscale dimensions (of the order of 1-10 μm). In present work, realization of a robust macroscale superlubricity state (μ = 0.0037), by taking advantage of the Synergy Effect of graphene-oxide nanoflakes (GONFs) and ethanediol (EDO) at Si3N4-SiO2 interfaces is reported. GONFs have been observed as being adsorbed on friction surfaces, thereby preventing direct contact between surface asperities. The extremely low shear stresses developed between these asperities contribute toward enhanced superlubricity and the resulting super-low wear. Meanwhile, the formation of partial-slip hydrodynamic boundary condition at the GONFs-EDO interface along with the formation of hydrated GONFs-EDO networks through hydrogen-bond interactions contribute to the generation of extremely low shear stresses of the liquid lubricating film. Such macroscale superlubricity provides a new approach toward realization of extremely low friction in GONFs through the Synergy Effect with liquids.
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Macroscale Superlubricity Enabled by the Synergy Effect of Graphene-Oxide Nanoflakes and Ethanediol
2018Co-Authors: Rui Luo, Chenhui Zhang, Jianbin LuoAbstract:Graphene has been recognized as an excellent lubrication material owing to its two-dimensional structure and weak interlayer interactions. However, most extant works concerning superlubricity involving graphene oxide have been limited to nanoscale or microscale dimensions (of the order of 1–10 μm). In present work, realization of a robust macroscale superlubricity state (μ = 0.0037), by taking advantage of the Synergy Effect of graphene-oxide nanoflakes (GONFs) and ethanediol (EDO) at Si3N4–SiO2 interfaces is reported. GONFs have been observed as being adsorbed on friction surfaces, thereby preventing direct contact between surface asperities. The extremely low shear stresses developed between these asperities contribute toward enhanced superlubricity and the resulting super-low wear. Meanwhile, the formation of partial-slip hydrodynamic boundary condition at the GONFs–EDO interface along with the formation of hydrated GONFs–EDO networks through hydrogen-bond interactions contribute to the generation of extremely low shear stresses of the liquid lubricating film. Such macroscale superlubricity provides a new approach toward realization of extremely low friction in GONFs through the Synergy Effect with liquids
T N Wong - One of the best experts on this subject based on the ideXlab platform.
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a hybrid multi agent negotiation protocol supporting supplier selection for multiple products with Synergy Effect
International Journal of Production Research, 2017Co-Authors: T N WongAbstract:Supplier selection is an important problem in supply chain management. In practice, it is common for a purchasing company to procure a bundle of products simultaneously. In this regard, Synergy Effect could exist between products and hence affect the final choice of suppliers. It is therefore necessary to incorporate the Synergy Effect between products in supplier selection process. Agent-based negotiation models are applied to automate supplier selection process. Negotiation protocol is an essential component should be considered when building an Effective agent negotiation model. The objective of this research is to propose a negotiation protocol special for multi-product supplier selection problem. The negotiation protocol is a hybrid multi-agent protocol of combinatorial procurement auction protocol and multi-bilateral bargaining protocol. The negotiation protocol is able to support the purchasing company and suppliers negotiate on the concrete commitments of multiple products simultaneously, and sele...
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an agent based negotiation model for supplier selection of multiple products with Synergy Effect
Expert Systems With Applications, 2015Co-Authors: T N WongAbstract:The model supports supplier selection for multiple products with Synergy Effect.The negotiation scheme of the model was elaborated for multi-product environment.A MAS was developed to realize the proposed model.The buyer and suppliers can exploit the synergies between products by the model.Simulations are conducted to demonstrate the functions of the model. Supplier selection is an important problem in supply chain management (SCM), and has attracted the attention of many researchers. Tremendous effort has been spent on the development of agent-based systems to automate supplier selection negotiation process in SCM applications. In this kind of multi-agent system (MAS), software agents are established to represent various parties and functions involving in the supplier selection negotiation process. Most of current systems only deal with relatively simple negotiations involving the acquisition of one product, they are not sufficient to support complex negotiations involving multiple products with Synergy Effect. However, in practice, it is common for a purchasing company to procure multiple products simultaneously, and the Synergy Effects that exist between products could affect the final choice of cooperative suppliers. This paper presents an agent-based negotiation model to automate the supplier selection process involving a bundle of products with Synergy Effect. A MAS is established to realize the proposed negotiation model for multi-product supplier selection. Furthermore, the negotiation proposal, negotiation protocol, negotiation strategies, and decision making methods involving in the negotiation model are elaborated for the multi-product supplier selection environment. Through the proposed negotiation model, the purchasing company and suppliers can reach agreements on the details of products simultaneously and exploit the Synergy Effect between products. Finally, illustrative examples are conducted to demonstrate the function and Effectiveness of the negotiation model for multi-product supplier selection.
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a supplier pre selection model for multiple products with Synergy Effect
International Journal of Production Research, 2014Co-Authors: T N WongAbstract:In practice, it is common for companies to purchase multiple products simultaneously. For the multiple required products, a large number of interested suppliers are involved. It is necessary for the purchasing company to shortlist a small number of qualified and competitive potential suppliers prior to finalising the suppliers for order fulfilment. In addition, Synergy Effect which is an Effect arising between two or more products that produce an Effect greater than the sum of their individual Effects, could exist in the multi-product supplier selection environment. Since Synergy Effect between products can affect the choice of suppliers, it is also necessary to incorporate the Synergy Effect between products in the supplier selection for multiple products. However, few research efforts have been focused on the supplier pre-selection problem, let alone explicitly for multiple products with Synergy Effect. This paper presents a supplier pre-selection model for multiple products with Synergy Effect. The mod...
Kai Yang - One of the best experts on this subject based on the ideXlab platform.
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performance analysis of an evaporator for a diesel engine organic rankine cycle orc combined system and influence of pressure drop on the diesel engine operating characteristics
Energies, 2015Co-Authors: Chen Bei, Hongguang Zhang, Fubin Yang, Songsong Song, Enhua Wang, Hao Liu, Ying Chang, Hongjin Wang, Kai YangAbstract:The main purpose of this research is to analyze the performance of an evaporator for the organic Rankine cycle (ORC) system and discuss the influence of the evaporator on the operating characteristics of diesel engine. A simulation model of fin-and-tube evaporator of the ORC system is established by using Fluent software. Then, the flow and heat transfer characteristics of the exhaust at the evaporator shell side are obtained, and then the performance of the fin-and-tube evaporator of the ORC system is analyzed based on the field Synergy principle. The field Synergy angle (β) is the intersection angle between the velocity vector and the temperature gradient. When the absolute values of velocity and temperature gradient are constant and β 90°, heat transfer enhancement can be achieved with the increase of the β. Subsequently, the influence of the evaporator of the ORC system on diesel engine performance is studied. A simulation model of the diesel engine is built by using GT–Power software under various operating conditions, and the variation tendency of engine power, torque, and brake specific fuel consumption (BSFC) are obtained. The variation tendency of the power output and BSFC of diesel engine–ORC combined system are obtained when the evaporation pressure ranges from 1.0 MPa to 3.5 MPa. Results show that the field Synergy Effect for the areas among the tube bundles of the evaporator main body and the field Synergy Effect for the areas among the fins on the windward side are satisfactory. However, the field Synergy Effect in the areas among the fins on the leeward side is weak. As a result of the pressure drop caused by the evaporator of the ORC system, the diesel engine power and torque decreases slightly, whereas the BSFC increases slightly with the increase of exhaust back pressure. With the increase of engine speed, power loss, torque loss, and BSFC increment increase gradually, where the most significant change is less than 1%. Compared with the diesel engine itself, the maximum increase of power output of the diesel engine–ORC combined system is 6.5% and the maximum decrease of BSFC is 6.1%.
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Performance Analysis of an Evaporator for a Diesel Engine–Organic Rankine Cycle (ORC) Combined System and Influence of Pressure Drop on the Diesel Engine Operating Characteristics
MDPI AG, 2015Co-Authors: Chen Bei, Hongguang Zhang, Fubin Yang, Songsong Song, Enhua Wang, Hao Liu, Ying Chang, Hongjin Wang, Kai YangAbstract:The main purpose of this research is to analyze the performance of an evaporator for the organic Rankine cycle (ORC) system and discuss the influence of the evaporator on the operating characteristics of diesel engine. A simulation model of fin-and-tube evaporator of the ORC system is established by using Fluent software. Then, the flow and heat transfer characteristics of the exhaust at the evaporator shell side are obtained, and then the performance of the fin-and-tube evaporator of the ORC system is analyzed based on the field Synergy principle. The field Synergy angle (β) is the intersection angle between the velocity vector and the temperature gradient. When the absolute values of velocity and temperature gradient are constant and β < 90°, heat transfer enhancement can be achieved with the decrease of the β. When the absolute values of velocity and temperature gradient are constant and β >90°, heat transfer enhancement can be achieved with the increase of the β. Subsequently, the influence of the evaporator of the ORC system on diesel engine performance is studied. A simulation model of the diesel engine is built by using GT–Power software under various operating conditions, and the variation tendency of engine power, torque, and brake specific fuel consumption (BSFC) are obtained. The variation tendency of the power output and BSFC of diesel engine–ORC combined system are obtained when the evaporation pressure ranges from 1.0 MPa to 3.5 MPa. Results show that the field Synergy Effect for the areas among the tube bundles of the evaporator main body and the field Synergy Effect for the areas among the fins on the windward side are satisfactory. However, the field Synergy Effect in the areas among the fins on the leeward side is weak. As a result of the pressure drop caused by the evaporator of the ORC system, the diesel engine power and torque decreases slightly, whereas the BSFC increases slightly with the increase of exhaust back pressure. With the increase of engine speed, power loss, torque loss, and BSFC increment increase gradually, where the most significant change is less than 1%. Compared with the diesel engine itself, the maximum increase of power output of the diesel engine–ORC combined system is 6.5% and the maximum decrease of BSFC is 6.1%
Rui Luo - One of the best experts on this subject based on the ideXlab platform.
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macroscale superlubricity enabled by the Synergy Effect of graphene oxide nanoflakes and ethanediol
ACS Applied Materials & Interfaces, 2018Co-Authors: Rui Luo, Chenhui Zhang, Jianbin LuoAbstract:Graphene has been recognized as an excellent lubrication material owing to its two-dimensional structure and weak interlayer interactions. However, most extant works concerning superlubricity involving graphene oxide have been limited to nanoscale or microscale dimensions (of the order of 1–10 μm). In present work, realization of a robust macroscale superlubricity state (μ = 0.0037), by taking advantage of the Synergy Effect of graphene-oxide nanoflakes (GONFs) and ethanediol (EDO) at Si3N4–SiO2 interfaces is reported. GONFs have been observed as being adsorbed on friction surfaces, thereby preventing direct contact between surface asperities. The extremely low shear stresses developed between these asperities contribute toward enhanced superlubricity and the resulting super-low wear. Meanwhile, the formation of partial-slip hydrodynamic boundary condition at the GONFs–EDO interface along with the formation of hydrated GONFs–EDO networks through hydrogen-bond interactions contribute to the generation of e...
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macroscale superlubricity enabled by the Synergy Effect of graphene oxide nanoflakes and ethanediol
ACS Applied Materials & Interfaces, 2018Co-Authors: Rui Luo, Chenhui Zhang, Jianbin LuoAbstract:Graphene has been recognized as an excellent lubrication material owing to its two-dimensional structure and weak interlayer interactions. However, most extant works concerning superlubricity involving graphene oxide have been limited to nanoscale or microscale dimensions (of the order of 1-10 μm). In present work, realization of a robust macroscale superlubricity state (μ = 0.0037), by taking advantage of the Synergy Effect of graphene-oxide nanoflakes (GONFs) and ethanediol (EDO) at Si3N4-SiO2 interfaces is reported. GONFs have been observed as being adsorbed on friction surfaces, thereby preventing direct contact between surface asperities. The extremely low shear stresses developed between these asperities contribute toward enhanced superlubricity and the resulting super-low wear. Meanwhile, the formation of partial-slip hydrodynamic boundary condition at the GONFs-EDO interface along with the formation of hydrated GONFs-EDO networks through hydrogen-bond interactions contribute to the generation of extremely low shear stresses of the liquid lubricating film. Such macroscale superlubricity provides a new approach toward realization of extremely low friction in GONFs through the Synergy Effect with liquids.
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Macroscale Superlubricity Enabled by the Synergy Effect of Graphene-Oxide Nanoflakes and Ethanediol
2018Co-Authors: Rui Luo, Chenhui Zhang, Jianbin LuoAbstract:Graphene has been recognized as an excellent lubrication material owing to its two-dimensional structure and weak interlayer interactions. However, most extant works concerning superlubricity involving graphene oxide have been limited to nanoscale or microscale dimensions (of the order of 1–10 μm). In present work, realization of a robust macroscale superlubricity state (μ = 0.0037), by taking advantage of the Synergy Effect of graphene-oxide nanoflakes (GONFs) and ethanediol (EDO) at Si3N4–SiO2 interfaces is reported. GONFs have been observed as being adsorbed on friction surfaces, thereby preventing direct contact between surface asperities. The extremely low shear stresses developed between these asperities contribute toward enhanced superlubricity and the resulting super-low wear. Meanwhile, the formation of partial-slip hydrodynamic boundary condition at the GONFs–EDO interface along with the formation of hydrated GONFs–EDO networks through hydrogen-bond interactions contribute to the generation of extremely low shear stresses of the liquid lubricating film. Such macroscale superlubricity provides a new approach toward realization of extremely low friction in GONFs through the Synergy Effect with liquids
Jeanmarie Herrmann - One of the best experts on this subject based on the ideXlab platform.
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solar photocatalytic degradation of 4 chlorophenol using the synergistic Effect between titania and activated carbon in aqueous suspension
Catalysis Today, 1999Co-Authors: Jeanmarie Herrmann, Juan Matos, Jorge Laine, Jean Disdier, Chantal Guillard, Sixto Malato, J BlancoAbstract:Abstract The photocatalytic degradation of 4-chlorophenol, chosen as an aromatic model pollutant, has been performed in contact with a suspended mixture of titania and of activated carbon (AC). Non-additive adsorption capacities were observed when the two solids were mixed. This was ascribed to a strong interaction between both solids. A Synergy Effect was observed with an increase of the first order rate constant by a factor of 2.4. As for neat titania, the same main intermediate products (hydroquinone and benzoquinone) were found but in much smaller quantities and during a much smaller lifetime. The Synergy Effect was ascribed to an extended adsorption of 4-chlorophenol on AC followed by a transfer to titania where it is photocatalytically degraded. When extrapolating these experiments by a volume factor of 12 500 to the solar pilot plant at PSA, an identical Synergy factor of 2.4 was found, thus confirming the transpositivity of laboratory experiments to large solar set-ups. The Synergy Effect was not destroyed when re-using the double phase photocatalyst. This combined photocatalytic system may appear as a new performing one, more efficient with a shorter time necessary for decontaminating diluted used waters, which could be of interest in producing drinking water in dry sunny areas.
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Synergy Effect in the photocatalytic degradation of phenol on a suspended mixture of titania and activated carbon
Applied Catalysis B-environmental, 1998Co-Authors: Juan Matos, Jorge Laine, Jeanmarie HerrmannAbstract:The photocatalytic degradation of phenol, chosen as an aromatic model molecule, has been performed at room temperature (20°C) in contact with a suspended mixture of titania and of activated carbon (AC). Non-additive adsorption capacities were observed when the solids were mixed, and this was ascribed to a strong interaction, involving half of the surface of titania and ca. 14% of that of AC. A Synergy Effect was observed with an increase of the first order rate constant by a factor of 2.5. As for neat titania, the same main intermediate products (hydroquinone and benzoquinone) were found but in much smaller quantities and during a much smaller lifetime, suggesting that the same reaction mechanism occurred in the presence of photoinactive AC. The Synergy Effect was ascribed to an extended adsorption of phenol on AC followed by a transfer to titania where it is photocatalytically degraded. The Synergy Effect could not be improved by previous physical treatments of the solid mixture such as grinding and sonication. Some phenol remained adsorbed on AC when no traces of organic compounds were detected in the purified water. This adsorbed phenol could be destroyed by illuminated titania while maintaining UV-irradiation. This combined photocatalytic system may appear as a new performing one, more efficient with a shorter time necessary for decontaminating diluted used waters.
