为了探究由光伏光热(PV/T)驱动的双热质耦合加湿除湿海水淡化系统的水电综合性能,基于能量与质量守恒原理构建了PV/T组件与加湿除湿系统的数学模型,揭示了液气比对系统相关热力学参数的影响规律,对比分析了不同顶温条件下系统的热力学性...为了探究由光伏光热(PV/T)驱动的双热质耦合加湿除湿海水淡化系统的水电综合性能,基于能量与质量守恒原理构建了PV/T组件与加湿除湿系统的数学模型,揭示了液气比对系统相关热力学参数的影响规律,对比分析了不同顶温条件下系统的热力学性能,并在某典型天气状况下探究了逐时辐照度对系统性能的综合影响。研究结果表明:热容比为1对应的液气比大小是系统的最佳性能点,此时系统造水比(GOR)与产水量均达到最大值,产电量取得最小值;当顶温为60℃时,系统产电量与产水量的极值分别为481.13 k W·m^(-2)和43.10 kg·h^(-1);系统产水性能随顶温的升高而增强。当顶温从55?C升高到60和65℃时,系统最大产水量分别增加了34.5%和68.06%,三种顶温条件下的最大GOR分别为1.31、1.56和1.71。展开更多
The unilateral contact problem can be formulated as a mathematical programming with inequality constraints. To resolve the difficulty in dealing with inequality constraints, a quasi-active set strategy algorithm was p...The unilateral contact problem can be formulated as a mathematical programming with inequality constraints. To resolve the difficulty in dealing with inequality constraints, a quasi-active set strategy algorithm was presented. At each iteration, it transforms the problem into one without contact in terms of the solution obtained in last iteration and initiates the current iteration using the solution of the transformed problem, and updates a group of contact pairs compared with Lemke algorithm that uqdates only one pair of contact points. The present algorithm greatly enhances the efficiency and numerical examples demonstrate the effectiveness and robustness of the proposed algorithm.展开更多
The three types of connections (Permanent Connection, Soft Permanent Connection and Switched Connection) provided by ASON can adapt the requirement of different network services. Management and maintenance of these th...The three types of connections (Permanent Connection, Soft Permanent Connection and Switched Connection) provided by ASON can adapt the requirement of different network services. Management and maintenance of these three connections are the most important aspect of ASON management. The information models proposed in this paper are used for the purpose of ASON connection management. Firstly a new information model is proposed to meet the requirement for the control plane introduced by ASON. In this model, a new class ControlNE is given, and the relationship between the ControlNE and the transport NE (network element) is also defined. Then this paper proposes information models for the three types of connections for the first time, and analyzes the relationship between the three kinds of connections and the basic network transport entities. Finally, the paper defines some CORBA interfaces for the management of the three connections. In these interfaces, some operations such as create or release a connection are defined, and some other operations can manage the performance of the three kinds of connections, which is necessary for a distributed management system.展开更多
The steel bonded carbide, a composite material, is very difficult to be machined to a fine finish mirror surface. In this paper, an electrolytic in-process dressing (ELID) grinding with metallic bond super-hard abrasi...The steel bonded carbide, a composite material, is very difficult to be machined to a fine finish mirror surface. In this paper, an electrolytic in-process dressing (ELID) grinding with metallic bond super-hard abrasive wheel was developed for grinding steel bonded carbide GT35. Factors affecting ELID grinding performance were analyzed by an atomic force microscope (AFM). Based on the analysis of AFM topography of the fine ground mirror surface of the steel bonded carbide, a schematic diagram of the mechanism of micro-removal of the ground surface was described. The AFM topography also shows that the hard brittle carbide particles, on the surface of steel bonded carbide, were machined out by ductile cutting. Since the grinding cracks in the ground surface are due to temperature gradient, temperature distribution in the grinding area was analyzed by finite element method (FEM). Experimental results indicate that a good mirror surface with Ra<0.02pm can be obtained by the developed ELID grinding system.展开更多
文摘为了探究由光伏光热(PV/T)驱动的双热质耦合加湿除湿海水淡化系统的水电综合性能,基于能量与质量守恒原理构建了PV/T组件与加湿除湿系统的数学模型,揭示了液气比对系统相关热力学参数的影响规律,对比分析了不同顶温条件下系统的热力学性能,并在某典型天气状况下探究了逐时辐照度对系统性能的综合影响。研究结果表明:热容比为1对应的液气比大小是系统的最佳性能点,此时系统造水比(GOR)与产水量均达到最大值,产电量取得最小值;当顶温为60℃时,系统产电量与产水量的极值分别为481.13 k W·m^(-2)和43.10 kg·h^(-1);系统产水性能随顶温的升高而增强。当顶温从55?C升高到60和65℃时,系统最大产水量分别增加了34.5%和68.06%,三种顶温条件下的最大GOR分别为1.31、1.56和1.71。
文摘The unilateral contact problem can be formulated as a mathematical programming with inequality constraints. To resolve the difficulty in dealing with inequality constraints, a quasi-active set strategy algorithm was presented. At each iteration, it transforms the problem into one without contact in terms of the solution obtained in last iteration and initiates the current iteration using the solution of the transformed problem, and updates a group of contact pairs compared with Lemke algorithm that uqdates only one pair of contact points. The present algorithm greatly enhances the efficiency and numerical examples demonstrate the effectiveness and robustness of the proposed algorithm.
文摘The three types of connections (Permanent Connection, Soft Permanent Connection and Switched Connection) provided by ASON can adapt the requirement of different network services. Management and maintenance of these three connections are the most important aspect of ASON management. The information models proposed in this paper are used for the purpose of ASON connection management. Firstly a new information model is proposed to meet the requirement for the control plane introduced by ASON. In this model, a new class ControlNE is given, and the relationship between the ControlNE and the transport NE (network element) is also defined. Then this paper proposes information models for the three types of connections for the first time, and analyzes the relationship between the three kinds of connections and the basic network transport entities. Finally, the paper defines some CORBA interfaces for the management of the three connections. In these interfaces, some operations such as create or release a connection are defined, and some other operations can manage the performance of the three kinds of connections, which is necessary for a distributed management system.
文摘The steel bonded carbide, a composite material, is very difficult to be machined to a fine finish mirror surface. In this paper, an electrolytic in-process dressing (ELID) grinding with metallic bond super-hard abrasive wheel was developed for grinding steel bonded carbide GT35. Factors affecting ELID grinding performance were analyzed by an atomic force microscope (AFM). Based on the analysis of AFM topography of the fine ground mirror surface of the steel bonded carbide, a schematic diagram of the mechanism of micro-removal of the ground surface was described. The AFM topography also shows that the hard brittle carbide particles, on the surface of steel bonded carbide, were machined out by ductile cutting. Since the grinding cracks in the ground surface are due to temperature gradient, temperature distribution in the grinding area was analyzed by finite element method (FEM). Experimental results indicate that a good mirror surface with Ra<0.02pm can be obtained by the developed ELID grinding system.
