The development of deep reservoirs is an emerging topic in the energy industry.This paper analyzes the challenges in simulations of flow and transport in deep reservoirs and introduces models and algorithms aimed at r...The development of deep reservoirs is an emerging topic in the energy industry.This paper analyzes the challenges in simulations of flow and transport in deep reservoirs and introduces models and algorithms aimed at resolving these challenges.A fast,accurate,and robust phase equilibrium model is developed with the aid of deep learning algorithms to accelerate the thermodynamic analysis of deep reservoir fluids.A pixel-free search algorithm is developed to generate a pore-network model that describes pore connectivity and porous media fluidity.A fully conservative Implicit Pressure Explicit Saturation algorithm is developed to simulate the Darcy-scale two-phase flow while achieving a reliable result for production evaluation.Numerical examples are presented to validate the performance of the developed models and algorithms.This paper also presents suggestions for future studies on deep reservoirs to achieve both scientific and engineering progress.展开更多
The paper addresses the designs of a caudal peduncle actuator, which is able to furnish a thrust for swimming of a robotic fish. The caudal peduncle actuator is based on concepts of ferromagnetic shape memory alloy （...The paper addresses the designs of a caudal peduncle actuator, which is able to furnish a thrust for swimming of a robotic fish. The caudal peduncle actuator is based on concepts of ferromagnetic shape memory alloy （FSMA） composite and hybrid mechanism that can provide a fast response and a strong thrust. The caudal peduncle actuator was inspired by Scomber Scombrus which utilises thunniform mode swimming, which is the most efficient locomotion mode evolved in the aquatic environment, where the thrust is generated by the lift-based method, allowing high cruising speeds to be maintained for a long period of time. The morphology of an average size Scomber Scombrus （length in 310 mm） was investigated, and a 1：1 scale caudal peduncle actuator prototype was modelled and fabricated. The propulsive wave characteristics of the fish at steady speeds were employed as initial design objectives. Some key design parameters are investigated, i.e. aspect ratio （AR） （AR = 3.49）, Reynolds number （Re = 429 649）, reduced frequency （σ = 1.03）, Strouhal number （St = 0.306） and the maximum strain of the bent tail was estimated at ε = 1.11% which is in the range of superelasticity. The experimental test of the actuator was carried out in a water tank. By applying 7 V and 2.5 A, the actuator can reach the tip-to-tip rotational angle of 85° at 4 Hz.展开更多
Ni30Cu20Mn37＋xGa13-x（x = 0–4.5） alloys were studied with the phase transformation and mechanical properties. With the increase of Mn content, the martensitic transformation temperatures increase and the Curie temp...Ni30Cu20Mn37＋xGa13-x（x = 0–4.5） alloys were studied with the phase transformation and mechanical properties. With the increase of Mn content, the martensitic transformation temperatures increase and the Curie temperature decreases. Simultaneously, the room temperature microstructure evolves from single phase of austenite to dual phases containing martensite and precipitation. Both the ductility and the strength of the polycrystalline alloys are significantly improved by the precipitation. Coupled magnetostructural transition from weak magnetic martensite to ferromagnetic austenite is obtained in both single-phase and ductile dual-phase alloys.展开更多
1. IntroductionThere have been a number of serious incidents of compro- mised food safety in China in recent years. To list a few, these include： a Salmonella outbreak, the use of horse- meat in burgers, the illegal ...1. IntroductionThere have been a number of serious incidents of compro- mised food safety in China in recent years. To list a few, these include： a Salmonella outbreak, the use of horse- meat in burgers, the illegal use of phthalates as a clouding agent, the contamination of formula milk by melamine, the meat scandal of Shanghai Husi Food Company which sold reprocessed stale meat to many fast food chains includ- ing McDonald＇s, Burger King, and KFC across theworld,展开更多
基金King Abdullah University of Science and Technology,Grant/Award Numbers:BAS/1/1351-01,URF/1/5028-01National Natural Science Foundation of China,Grant/Award Number:51936001。
文摘The development of deep reservoirs is an emerging topic in the energy industry.This paper analyzes the challenges in simulations of flow and transport in deep reservoirs and introduces models and algorithms aimed at resolving these challenges.A fast,accurate,and robust phase equilibrium model is developed with the aid of deep learning algorithms to accelerate the thermodynamic analysis of deep reservoir fluids.A pixel-free search algorithm is developed to generate a pore-network model that describes pore connectivity and porous media fluidity.A fully conservative Implicit Pressure Explicit Saturation algorithm is developed to simulate the Darcy-scale two-phase flow while achieving a reliable result for production evaluation.Numerical examples are presented to validate the performance of the developed models and algorithms.This paper also presents suggestions for future studies on deep reservoirs to achieve both scientific and engineering progress.
文摘The paper addresses the designs of a caudal peduncle actuator, which is able to furnish a thrust for swimming of a robotic fish. The caudal peduncle actuator is based on concepts of ferromagnetic shape memory alloy （FSMA） composite and hybrid mechanism that can provide a fast response and a strong thrust. The caudal peduncle actuator was inspired by Scomber Scombrus which utilises thunniform mode swimming, which is the most efficient locomotion mode evolved in the aquatic environment, where the thrust is generated by the lift-based method, allowing high cruising speeds to be maintained for a long period of time. The morphology of an average size Scomber Scombrus （length in 310 mm） was investigated, and a 1：1 scale caudal peduncle actuator prototype was modelled and fabricated. The propulsive wave characteristics of the fish at steady speeds were employed as initial design objectives. Some key design parameters are investigated, i.e. aspect ratio （AR） （AR = 3.49）, Reynolds number （Re = 429 649）, reduced frequency （σ = 1.03）, Strouhal number （St = 0.306） and the maximum strain of the bent tail was estimated at ε = 1.11% which is in the range of superelasticity. The experimental test of the actuator was carried out in a water tank. By applying 7 V and 2.5 A, the actuator can reach the tip-to-tip rotational angle of 85° at 4 Hz.
基金financially supported by the National Basic Research Program of China (No. 2012CB619404)the National Natural Science Foundation of China (Nos. 50925101, 51221163, and 51001004)+1 种基金Beijing Natural Science Foundation(No. 2132026)the Fundamental Research Funds for Central Universities (No. YWF-12-LZGF-052)
文摘Ni30Cu20Mn37＋xGa13-x（x = 0–4.5） alloys were studied with the phase transformation and mechanical properties. With the increase of Mn content, the martensitic transformation temperatures increase and the Curie temperature decreases. Simultaneously, the room temperature microstructure evolves from single phase of austenite to dual phases containing martensite and precipitation. Both the ductility and the strength of the polycrystalline alloys are significantly improved by the precipitation. Coupled magnetostructural transition from weak magnetic martensite to ferromagnetic austenite is obtained in both single-phase and ductile dual-phase alloys.
文摘1. IntroductionThere have been a number of serious incidents of compro- mised food safety in China in recent years. To list a few, these include： a Salmonella outbreak, the use of horse- meat in burgers, the illegal use of phthalates as a clouding agent, the contamination of formula milk by melamine, the meat scandal of Shanghai Husi Food Company which sold reprocessed stale meat to many fast food chains includ- ing McDonald＇s, Burger King, and KFC across theworld,
