A schematic to make the spectra of the exterior noise of high speed railway was put forward. The exterior noise spectrum was defined based on the characteristics of the high-speed train exterior noise. Its characteris...A schematic to make the spectra of the exterior noise of high speed railway was put forward. The exterior noise spectrum was defined based on the characteristics of the high-speed train exterior noise. Its characteristics considered here include identifying the exterior main sources and their locations, their frequency components including the Doppler effect due to the noise sources moving at high speed, the sound field intensity around the train in high-speed operation, the sound radiation path out of the train, and the pressure level and frequency components of the noise at the measuring points specified by the International Organization for Standardization(ISO). The characteristics of the high-speed train exterior noise of the high speed railways in operation were introduced. The advanced measuring systems and their principles for clearly indentifying the exterior noise sources were discussed in detail. Based on the concerned noise results measured at sites, a prediction model was developed to calculate the sound level and the characteristics of the exterior noise at any point where it is difficult to measure and to help to make the exterior noise spectrums. This model was also verified with the test results. The verification shows that there is a good agreement between the theoretical and experimental results.展开更多
The application of bilingual teaching in vocational colleges is necessary choice of acting on international standards, promoting education reform, improving the competitive advantage of profession. As computer program...The application of bilingual teaching in vocational colleges is necessary choice of acting on international standards, promoting education reform, improving the competitive advantage of profession. As computer programming languages are developed in America with native English, it is of great significance for vocational college to promote bilingual education in computer programming courses. This paper analyzes the current teaching situation in vocational programming courses, describes the practice of bilingual teaching vocational programming from three aspects such as teaching resources, teaching methods and assessment methods to improve students＇ programming ability, and to promote development of bilingual education on vocational programming courses.展开更多
基金Project(2682013BR009)supported by the Fundamental Research Funds of the Central Universities,ChinaProject(2011AA11A103-2-2)the National High-Technology Research and Development Program of China
文摘A schematic to make the spectra of the exterior noise of high speed railway was put forward. The exterior noise spectrum was defined based on the characteristics of the high-speed train exterior noise. Its characteristics considered here include identifying the exterior main sources and their locations, their frequency components including the Doppler effect due to the noise sources moving at high speed, the sound field intensity around the train in high-speed operation, the sound radiation path out of the train, and the pressure level and frequency components of the noise at the measuring points specified by the International Organization for Standardization(ISO). The characteristics of the high-speed train exterior noise of the high speed railways in operation were introduced. The advanced measuring systems and their principles for clearly indentifying the exterior noise sources were discussed in detail. Based on the concerned noise results measured at sites, a prediction model was developed to calculate the sound level and the characteristics of the exterior noise at any point where it is difficult to measure and to help to make the exterior noise spectrums. This model was also verified with the test results. The verification shows that there is a good agreement between the theoretical and experimental results.
文摘The application of bilingual teaching in vocational colleges is necessary choice of acting on international standards, promoting education reform, improving the competitive advantage of profession. As computer programming languages are developed in America with native English, it is of great significance for vocational college to promote bilingual education in computer programming courses. This paper analyzes the current teaching situation in vocational programming courses, describes the practice of bilingual teaching vocational programming from three aspects such as teaching resources, teaching methods and assessment methods to improve students＇ programming ability, and to promote development of bilingual education on vocational programming courses.
