Modified refractivity (M) profile is an important parameter to describe the atmospheric refraction environment,as well as a key factor in uniquely evaluating electromagnetic propagation effects.In order to improve the...Modified refractivity (M) profile is an important parameter to describe the atmospheric refraction environment,as well as a key factor in uniquely evaluating electromagnetic propagation effects.In order to improve the model-derived M profile in stable (especially very stable) conditions,three nonlinear similarity functions,namely BH91,CB05,SHEBA07,are introduced in this paper to improve the original Babin_V25 model,and the performances of these modified models are verified based on the hydrometeorological observations from tower platforms,which are finally compared with the original Babin_V25 model and Local_HYQ92 model.Results show that introducing nonlinear similarity functions can significantly improve the model-derived M profile;especially,the newly developed SHEBA07 functions manage to reduce the predicted root mean square (rms) differences of M and M slope (for both 0-5m and 5-40m) by 64.5%,16.6%,and 60.4%,respectively in stable conditions.Unfortunately,this improved method reacts little on the evaporation duct height;in contrast,Local_HYQ92 model is capable of reducing the predicted rms differences of M,M slope (for both 0-5m and 5-40m),and evaporation duct height by 76.7%,40.2%,83.7%,and 58.0% respectively.Finally,a new recommendation is made to apply Local_HYQ92 and Babin_SHEBA07 in very stable conditions considering that M slope is more important than evaporation duct height and absolute M value in uniquely determining electromagnetic propagation effects.展开更多
Engineers are very much part of the ongoing globalization and they are encountering problems of cross-disciplinary nature Team working skills respecting other peoples＇ qualifications are required so therefore interpe...Engineers are very much part of the ongoing globalization and they are encountering problems of cross-disciplinary nature Team working skills respecting other peoples＇ qualifications are required so therefore interpersonal skills are becoming more and more important, including communications skills, leadership and awareness. Consequently, educational programs for teaching engineers should work with the fact that the capability of communicating with people with different background competences is important, nevertheless the engineering education has traditionally focused on technical skills rather than on personal development. In order to reform the B.Sc. courses to guide students to become better and more efficient engineers on all levels, the DTU （Technical University of Denmark） and Helsinki Metropolia University of Applied Sciences （Metropolia） modified their education according to the CDIO （conceive, design, implement and operate） approach in the autumn of 2008. The CDIO pedagogy encouraged to develop an interactive course in interpersonal skills, where the students have to take an active part in the exercises as well as involve themselves in the interactive communication process. The course consists of various exercises from which the participants will develop their awareness and knowledge of communication. It is the intention to give the students a personal understanding and idea of a different approach to communicating between people. The students evaluated the course, and the four key questions dealing with the quality of the course show a very high satisfaction with the instruction. The grades one and two （1 best/very much, 5 worst/very little） of the responses ＂to these four questions are ranging on average from 69.5% to 88% （on a yearly basis）. The positive responses indicate that the students are very satisfied with the course recognizing the need for education on international communication.展开更多
基金Key project of the National Natural Science Foundation of China(4083095841005029)the "973" National Basis Research and Development Program of China (2009CB421502)
文摘Modified refractivity (M) profile is an important parameter to describe the atmospheric refraction environment,as well as a key factor in uniquely evaluating electromagnetic propagation effects.In order to improve the model-derived M profile in stable (especially very stable) conditions,three nonlinear similarity functions,namely BH91,CB05,SHEBA07,are introduced in this paper to improve the original Babin_V25 model,and the performances of these modified models are verified based on the hydrometeorological observations from tower platforms,which are finally compared with the original Babin_V25 model and Local_HYQ92 model.Results show that introducing nonlinear similarity functions can significantly improve the model-derived M profile;especially,the newly developed SHEBA07 functions manage to reduce the predicted root mean square (rms) differences of M and M slope (for both 0-5m and 5-40m) by 64.5%,16.6%,and 60.4%,respectively in stable conditions.Unfortunately,this improved method reacts little on the evaporation duct height;in contrast,Local_HYQ92 model is capable of reducing the predicted rms differences of M,M slope (for both 0-5m and 5-40m),and evaporation duct height by 76.7%,40.2%,83.7%,and 58.0% respectively.Finally,a new recommendation is made to apply Local_HYQ92 and Babin_SHEBA07 in very stable conditions considering that M slope is more important than evaporation duct height and absolute M value in uniquely determining electromagnetic propagation effects.
文摘Engineers are very much part of the ongoing globalization and they are encountering problems of cross-disciplinary nature Team working skills respecting other peoples＇ qualifications are required so therefore interpersonal skills are becoming more and more important, including communications skills, leadership and awareness. Consequently, educational programs for teaching engineers should work with the fact that the capability of communicating with people with different background competences is important, nevertheless the engineering education has traditionally focused on technical skills rather than on personal development. In order to reform the B.Sc. courses to guide students to become better and more efficient engineers on all levels, the DTU （Technical University of Denmark） and Helsinki Metropolia University of Applied Sciences （Metropolia） modified their education according to the CDIO （conceive, design, implement and operate） approach in the autumn of 2008. The CDIO pedagogy encouraged to develop an interactive course in interpersonal skills, where the students have to take an active part in the exercises as well as involve themselves in the interactive communication process. The course consists of various exercises from which the participants will develop their awareness and knowledge of communication. It is the intention to give the students a personal understanding and idea of a different approach to communicating between people. The students evaluated the course, and the four key questions dealing with the quality of the course show a very high satisfaction with the instruction. The grades one and two （1 best/very much, 5 worst/very little） of the responses ＂to these four questions are ranging on average from 69.5% to 88% （on a yearly basis）. The positive responses indicate that the students are very satisfied with the course recognizing the need for education on international communication.
