In this paper, on the basis of the implementation of the national chemical industry standard analytical test methods and analysis of test items, a food additive quality analysis and inspection of network management ap...In this paper, on the basis of the implementation of the national chemical industry standard analytical test methods and analysis of test items, a food additive quality analysis and inspection of network management applications are developed using the development technology of Visual Basic language and computer system operating environment, to achieve a network management software for users on food additives of quality analytical testing. The software sets up an information sharing network platform for enterprise and quality management departments, which is a major innovation in the food additive quality analysis on test management methods and tools.展开更多
It is stipulated in the China national document, named'The Economical Appraisal Methods for Construction Projects' that dynamic analysis should dominate the project economical appraisal methods. This paper has...It is stipulated in the China national document, named'The Economical Appraisal Methods for Construction Projects' that dynamic analysis should dominate the project economical appraisal methods. This paper has set up a dynamic investment forecast model for Yuanbaoshan Surface Coal Mine. Based on this model, the investment reliability using simulation and analytic methods has been analysed, and the probability that the designed internal rate of return can reach 8.4%, from economic points of view, have been also studied.展开更多
In the case of electric or tram traction vehicles, the energy for propulsion purposes, as well as all other purposes, is processed and delivered via traction substations. Knowledge of the course of traction substation...In the case of electric or tram traction vehicles, the energy for propulsion purposes, as well as all other purposes, is processed and delivered via traction substations. Knowledge of the course of traction substation loading, especially at the stage of its design, is an extremely important issue because of the choice of the processing equipment of the main circuit or protection devices. In the range of investigations of railway traction substation B in vicinity of Cracow （Poland）, the measurements of current load in hours 4：00 a.m.-8：00 p.m. were realized. The measurements for the analysis were chosen from those realized between 6：00 a.m.-8：00 a.m. （the morning rush time）. Due to the sampling of 2 h summit with a frequency of 2 kHz, the recorded data set contains 1.44 ~ 107 elements. Therefore, the necessary transformation of data was to lower frequency 1 Hz, 10 Hz and 50 Hz. The results of the analysis presented below indicate the effect of such conduct on the obtained results for the parameters of time series models. In view of the unsatisfactory effects of the polynomial approximation, there is a need to seek a more efficient approximation method for achieving the optimum compatibility with the measured process. Continued research should lead to the formulation of procedures, which will determine an acceptable accuracy of the expected variability of traction substation loads.展开更多
This study investigated the assessment skills of secondary EFL teachers through analyzing the quality of test items on a municipal English examination for eighth graders in a city located in northern China. Data inclu...This study investigated the assessment skills of secondary EFL teachers through analyzing the quality of test items on a municipal English examination for eighth graders in a city located in northern China. Data included students＇ answers to test items as well as a post-test questionnaire and teachers＇ responses to semi-structured interviews. It was found that overall, the test functioned satisfactorily, with most items moderately easy yet discriminating, and high internal consistency and strong correlations among subscale scores. However, item analysis and content review of the test identified some items with incorrect or multiple keys, which may result from a combination of EFL teachers＇ inadequate language proficiency and their attempts to write attractive distractors.展开更多
Analyzing up to ten years of pulsar timing data observed by the 25-m Nanshan telescope at Urumqi, China, we studied power spectra of timing residuals for four pulsars based on orthogonal polynomials. Our work reveals ...Analyzing up to ten years of pulsar timing data observed by the 25-m Nanshan telescope at Urumqi, China, we studied power spectra of timing residuals for four pulsars based on orthogonal polynomials. Our work reveals that an index of -4 is consistent with a power law model and reveals random walk noise in the rotating frequency. Stability with A8 is investigated and found to be consistent with previous results. A new method called the morphology filter is applied to denoise the pulsar timing residuals and to perform further spectrum analysis. The spectra obtained with this method are improved in accuracy compared with those from timing residuals of pulsars directly.展开更多
文摘In this paper, on the basis of the implementation of the national chemical industry standard analytical test methods and analysis of test items, a food additive quality analysis and inspection of network management applications are developed using the development technology of Visual Basic language and computer system operating environment, to achieve a network management software for users on food additives of quality analytical testing. The software sets up an information sharing network platform for enterprise and quality management departments, which is a major innovation in the food additive quality analysis on test management methods and tools.
基金This project has been supported by the seience foundation of the doctorate programmes of the National Education Commission.
文摘It is stipulated in the China national document, named'The Economical Appraisal Methods for Construction Projects' that dynamic analysis should dominate the project economical appraisal methods. This paper has set up a dynamic investment forecast model for Yuanbaoshan Surface Coal Mine. Based on this model, the investment reliability using simulation and analytic methods has been analysed, and the probability that the designed internal rate of return can reach 8.4%, from economic points of view, have been also studied.
文摘In the case of electric or tram traction vehicles, the energy for propulsion purposes, as well as all other purposes, is processed and delivered via traction substations. Knowledge of the course of traction substation loading, especially at the stage of its design, is an extremely important issue because of the choice of the processing equipment of the main circuit or protection devices. In the range of investigations of railway traction substation B in vicinity of Cracow （Poland）, the measurements of current load in hours 4：00 a.m.-8：00 p.m. were realized. The measurements for the analysis were chosen from those realized between 6：00 a.m.-8：00 a.m. （the morning rush time）. Due to the sampling of 2 h summit with a frequency of 2 kHz, the recorded data set contains 1.44 ~ 107 elements. Therefore, the necessary transformation of data was to lower frequency 1 Hz, 10 Hz and 50 Hz. The results of the analysis presented below indicate the effect of such conduct on the obtained results for the parameters of time series models. In view of the unsatisfactory effects of the polynomial approximation, there is a need to seek a more efficient approximation method for achieving the optimum compatibility with the measured process. Continued research should lead to the formulation of procedures, which will determine an acceptable accuracy of the expected variability of traction substation loads.
基金sponsored by "The Fundamental Research Funds of Shandong University"
文摘This study investigated the assessment skills of secondary EFL teachers through analyzing the quality of test items on a municipal English examination for eighth graders in a city located in northern China. Data included students＇ answers to test items as well as a post-test questionnaire and teachers＇ responses to semi-structured interviews. It was found that overall, the test functioned satisfactorily, with most items moderately easy yet discriminating, and high internal consistency and strong correlations among subscale scores. However, item analysis and content review of the test identified some items with incorrect or multiple keys, which may result from a combination of EFL teachers＇ inadequate language proficiency and their attempts to write attractive distractors.
基金supported by the Fundamental Research Funds for the Central Universitiesthe National Natural Science Foundation of China (Grant Nos.41074023 and 10903019)+2 种基金the Knowledge Innovation Program of CAS project (Grant No.KJCX2-YW-T09)the National Basic Research Program of China (Grant No.2009CB824800)the Key Laboratory of Radio Astronomy of CAS and the program of the West Light Foundation of the Chinese Academy of Sciences (Grant No.XBBS201021)
文摘Analyzing up to ten years of pulsar timing data observed by the 25-m Nanshan telescope at Urumqi, China, we studied power spectra of timing residuals for four pulsars based on orthogonal polynomials. Our work reveals that an index of -4 is consistent with a power law model and reveals random walk noise in the rotating frequency. Stability with A8 is investigated and found to be consistent with previous results. A new method called the morphology filter is applied to denoise the pulsar timing residuals and to perform further spectrum analysis. The spectra obtained with this method are improved in accuracy compared with those from timing residuals of pulsars directly.
