Scientific and technical progress has been the driving forces of enterprises development.Milk productive enterprises are developing faster and growing better.It is very important to measure the contributive ratio of s...Scientific and technical progress has been the driving forces of enterprises development.Milk productive enterprises are developing faster and growing better.It is very important to measure the contributive ratio of scientific and technical progress in milk productive enterprises.And the appraisement could help to develop milk productive enterprises.The model C^2GS^2 was established to appraise the contributive ratio of scientific and technical progress in milk productive enterprises in the research.And the appraisement on the contributive ratio of scientific and technical progress in milk productive enterprises was made by the model.In the results of appraisement,science and technology play a main role in milk productive enterprises.It is shown that our milk productive enterprises are developed by scientific and technical progress while not by input of productive factors.展开更多
构建了一种基于R^2LC^2(可靠、冗余、损耗、特性、成本)的中高压多电平统一电能质量调节器(Unified Power Quality Conditioner,UPQC)拓扑评估体系。选定多种应用于UPQC的多电平拓扑结构类型,建立多电平UPQC拓扑结构的损耗模型、故障模...构建了一种基于R^2LC^2(可靠、冗余、损耗、特性、成本)的中高压多电平统一电能质量调节器(Unified Power Quality Conditioner,UPQC)拓扑评估体系。选定多种应用于UPQC的多电平拓扑结构类型,建立多电平UPQC拓扑结构的损耗模型、故障模型、仿真模型、冗余模型和器件模型,分别用以分析并形成损耗与拓扑关系、拓扑可靠性、暂稳态特性、系统稳定性、结构与成本关系的评价指标。结合五种评价指标的相互影响关系,建立层次分析模型,定量得到五种评价指标的权重系数,构造成对比较矩阵,计算排序权向量,全面分析多种多电平UPQC拓扑结构的整体性能,实现多电平UPQC拓扑结构的综合准确评估,提供多电平UPQC变流器拓扑结构类型的选择依据。选取级联H桥、模块化多电平变流器和换桥臂多电平变流器为实际应用范例,验证了所提评估体系的可行性。展开更多
In this paper, condensation of water vapor from a mixture of COR2R/HR2RO is studied numerically. To simplify the study and focus on the physical model, a simple vertical plate was chosen. Two condensation models are d...In this paper, condensation of water vapor from a mixture of COR2R/HR2RO is studied numerically. To simplify the study and focus on the physical model, a simple vertical plate was chosen. Two condensation models are developed and numerical approach is considered to implement these models. The main objective in the cur-rent paper was to study the capability of numerical modeling in prediction of complex process. Results showed that developed condensation models in combination with numerical approach can predict the trends in condensation behavior of binary mixture very well. Results from this study can be developed further to be used in design of condensers which are suitable for oxy-fuel power plants.展开更多
基金Supported by Fund of Post Doctoral Research in Heilongjiang Province(LSZH-04052)Fund of Scientific and Technical Research Projects(10551039)
文摘Scientific and technical progress has been the driving forces of enterprises development.Milk productive enterprises are developing faster and growing better.It is very important to measure the contributive ratio of scientific and technical progress in milk productive enterprises.And the appraisement could help to develop milk productive enterprises.The model C^2GS^2 was established to appraise the contributive ratio of scientific and technical progress in milk productive enterprises in the research.And the appraisement on the contributive ratio of scientific and technical progress in milk productive enterprises was made by the model.In the results of appraisement,science and technology play a main role in milk productive enterprises.It is shown that our milk productive enterprises are developed by scientific and technical progress while not by input of productive factors.
文摘构建了一种基于R^2LC^2(可靠、冗余、损耗、特性、成本)的中高压多电平统一电能质量调节器(Unified Power Quality Conditioner,UPQC)拓扑评估体系。选定多种应用于UPQC的多电平拓扑结构类型,建立多电平UPQC拓扑结构的损耗模型、故障模型、仿真模型、冗余模型和器件模型,分别用以分析并形成损耗与拓扑关系、拓扑可靠性、暂稳态特性、系统稳定性、结构与成本关系的评价指标。结合五种评价指标的相互影响关系,建立层次分析模型,定量得到五种评价指标的权重系数,构造成对比较矩阵,计算排序权向量,全面分析多种多电平UPQC拓扑结构的整体性能,实现多电平UPQC拓扑结构的综合准确评估,提供多电平UPQC变流器拓扑结构类型的选择依据。选取级联H桥、模块化多电平变流器和换桥臂多电平变流器为实际应用范例,验证了所提评估体系的可行性。
文摘In this paper, condensation of water vapor from a mixture of COR2R/HR2RO is studied numerically. To simplify the study and focus on the physical model, a simple vertical plate was chosen. Two condensation models are developed and numerical approach is considered to implement these models. The main objective in the cur-rent paper was to study the capability of numerical modeling in prediction of complex process. Results showed that developed condensation models in combination with numerical approach can predict the trends in condensation behavior of binary mixture very well. Results from this study can be developed further to be used in design of condensers which are suitable for oxy-fuel power plants.
