Complex slopes are characterized by large numbers of failure modes,cut sets or link sets,or by statistical dependence between the failure modes.For such slopes,a systematic quantitative method,or matrix-based system r...Complex slopes are characterized by large numbers of failure modes,cut sets or link sets,or by statistical dependence between the failure modes.For such slopes,a systematic quantitative method,or matrix-based system reliability method,was described and improved for their reliability analysis.A construction formula of event vector c E was suggested to solve the difficulty of identifying any component E in sample space,and event vector c of system events can be calculated based on it,then the bounds of system failure probability can be obtained with the given probability information.The improved method was illustrated for four copper mine slopes with multiple failure modes,and the bounds of system failure probabilities were calculated by self-compiling program on the platform of the software MATLAB.Comparison in results from matrix-based system reliability method and two generic system methods suggests that identical accuracy could be obtained by all methods if there are only a few failure modes in slope system.Otherwise,the bounds by the Ditlevsen method or Cornell method are expanded obviously with the increase of failure modes and their precision can hardly satisfy the requirement of practical engineering while the results from the proposed method are still accurate enough.展开更多
Cracking gas compressor is usually a centrifugal compressor. The information on the performance of a centrifugal compressor under all conditions is not available, which restricts the operation optimization for compres...Cracking gas compressor is usually a centrifugal compressor. The information on the performance of a centrifugal compressor under all conditions is not available, which restricts the operation optimization for compressor. To solve this problem, two back propagation (BP) neural networks were introduced to model the performance of a compressor by using the data provided by manufacturer. The input data of the model under other conditions should be corrected according to the similarity theory. The method was used to optimize the system of a cracking gas compressor by embedding the compressor performance model into the ASPEN PLUS model of compressor. The result shows that it is an effective method to optimize the compressor system.展开更多
Introducing the development background and essential aspects of Betty Newman's system model,and exploring the application status of the theory all over the worldwide.This review points out that combining the theor...Introducing the development background and essential aspects of Betty Newman's system model,and exploring the application status of the theory all over the worldwide.This review points out that combining the theoretical model with nursing practice can effectively improve patients'disease self-management ability and improve the quality of life.At the same time,the theory has certain similarities with traditional Chinese medicine nursing,and can provide reference for the development of Chinese medicine nursing theory.展开更多
This paper conducts the analysis on development of the basic English extensive reading system and the applications on the reading teaching of sports news. Extensive reading of text or material is dead and cannot provi...This paper conducts the analysis on development of the basic English extensive reading system and the applications on the reading teaching of sports news. Extensive reading of text or material is dead and cannot provide a teaching model. How to talk about what to proceed from reality, according to the principle of gradual and orderly, according to the level of the students and the ability to accept. English newspapers as fresh language, popular novel, close to the life of a corpus source that is the college English teaching has always attached importance to the reference materials. According to the rhetorical characteristics of English newspapers, we set the course, it is best to learn some rhetorical knowledge after the students to open the course, English majors can learn after the rhetoric can also be extended as the rhetoric class and homework. This paper proposes the new idea of dealing with mentioned issues that will promote the development of reading teaching of sports news.展开更多
Along with the continuous development and application of information technology, the information management system of the modem enterprises plays a crucial role in achieving efficient enterprise development. In this p...Along with the continuous development and application of information technology, the information management system of the modem enterprises plays a crucial role in achieving efficient enterprise development. In this paper, the current problems in the information management system of modem enterprises are analyzed, the demand analysis of the information management system design is introduced, and also a feasible enterprise information management system is designed based on B/S mode.展开更多
基金Project(51078170) supported by the National Natural Science Foundation of ChinaProject(10JDG097) supported by Jiangsu University Talents Funds,China
文摘Complex slopes are characterized by large numbers of failure modes,cut sets or link sets,or by statistical dependence between the failure modes.For such slopes,a systematic quantitative method,or matrix-based system reliability method,was described and improved for their reliability analysis.A construction formula of event vector c E was suggested to solve the difficulty of identifying any component E in sample space,and event vector c of system events can be calculated based on it,then the bounds of system failure probability can be obtained with the given probability information.The improved method was illustrated for four copper mine slopes with multiple failure modes,and the bounds of system failure probabilities were calculated by self-compiling program on the platform of the software MATLAB.Comparison in results from matrix-based system reliability method and two generic system methods suggests that identical accuracy could be obtained by all methods if there are only a few failure modes in slope system.Otherwise,the bounds by the Ditlevsen method or Cornell method are expanded obviously with the increase of failure modes and their precision can hardly satisfy the requirement of practical engineering while the results from the proposed method are still accurate enough.
基金Supported by the National Natural Science Foundation of China (20976048, 21176072)the Fundamental Research Funds for the Central Universities
文摘Cracking gas compressor is usually a centrifugal compressor. The information on the performance of a centrifugal compressor under all conditions is not available, which restricts the operation optimization for compressor. To solve this problem, two back propagation (BP) neural networks were introduced to model the performance of a compressor by using the data provided by manufacturer. The input data of the model under other conditions should be corrected according to the similarity theory. The method was used to optimize the system of a cracking gas compressor by embedding the compressor performance model into the ASPEN PLUS model of compressor. The result shows that it is an effective method to optimize the compressor system.
文摘Introducing the development background and essential aspects of Betty Newman's system model,and exploring the application status of the theory all over the worldwide.This review points out that combining the theoretical model with nursing practice can effectively improve patients'disease self-management ability and improve the quality of life.At the same time,the theory has certain similarities with traditional Chinese medicine nursing,and can provide reference for the development of Chinese medicine nursing theory.
文摘This paper conducts the analysis on development of the basic English extensive reading system and the applications on the reading teaching of sports news. Extensive reading of text or material is dead and cannot provide a teaching model. How to talk about what to proceed from reality, according to the principle of gradual and orderly, according to the level of the students and the ability to accept. English newspapers as fresh language, popular novel, close to the life of a corpus source that is the college English teaching has always attached importance to the reference materials. According to the rhetorical characteristics of English newspapers, we set the course, it is best to learn some rhetorical knowledge after the students to open the course, English majors can learn after the rhetoric can also be extended as the rhetoric class and homework. This paper proposes the new idea of dealing with mentioned issues that will promote the development of reading teaching of sports news.
文摘Along with the continuous development and application of information technology, the information management system of the modem enterprises plays a crucial role in achieving efficient enterprise development. In this paper, the current problems in the information management system of modem enterprises are analyzed, the demand analysis of the information management system design is introduced, and also a feasible enterprise information management system is designed based on B/S mode.
