The SMOS(soil moisture and ocean salinity) mission undertaken by the European Space Agency(ESA) has provided sea surface salinity(SSS) measurements at global scale since 2009.Validation of SSS values retrieved from SM...The SMOS(soil moisture and ocean salinity) mission undertaken by the European Space Agency(ESA) has provided sea surface salinity(SSS) measurements at global scale since 2009.Validation of SSS values retrieved from SMOS data has been done globally and regionally.However,the accuracy of SSS measurements by SMOS in the China seas has not been examined in detail.In this study,we compared retrieved SSS values from SMOS data with in situ measurements from a South China Sea(SCS) expedition during autumn 2011.The comparison shows that the retrieved SSS values using ascending pass data have much better agreement with in situ measurements than the result derived from descending pass data.Accuracy in terms of bias and root mean square error(RMS) of the SSS retrieved using three different sea surface roughness models is very consistent,regardless of ascending or descending orbits.When ascending and descending measurements are combined for comparison,the retrieved SSS using a semi-empirical model shows the best agreement with in situ measurements,with bias-0.33 practical salinity units and RMS 0.74.We also investigated the impact of environmental conditions of sea surface wind and sea surface temperature on accuracy of the retrieved SSS.The SCS is a semi-closed basin where radio frequencies transmitted from the mainland strongly interfere with SMOS measurements.Therefore,accuracy of retrieved SSS shows a relationship with distance between the validation sites and land.展开更多
Based on a variety of case histories of site investigations, including extensive bore hole data, laboratory testing and geophysical prospecting at more than 550 construction sites, an empirical formulation is proposed...Based on a variety of case histories of site investigations, including extensive bore hole data, laboratory testing and geophysical prospecting at more than 550 construction sites, an empirical formulation is proposed for the rapid determination of allowable bearing pressure of shallow foundations in soils and rocks. The proposed expression corroborates consistently with the results of the classical theory and is proven to be rapid, and reliable. Plate load tests have been also carried out at three different sites, in order to further confirm the validity of the proposed method. It consists of only two soil parameters, namely, the in situ measured shear wave velocity and the unit weight. The unit weight may be also determined with sufficient accuracy, by means of other empirical expressions proposed, using P or S -- wave velocities. It is indicated that once the shear and P-wave velocities are measured in situ by an appropriate geophysical survey, the allowable bearing pressure as well as the coefficient of subgrade reaction and many other elasticity parameters may be determined rapidly and reliably.展开更多
As a special art of the music performances, the vocal music is different from the philosophy and the social sciences, which is reflected not through the theoretical explanation or the theoretical researches, but shoul...As a special art of the music performances, the vocal music is different from the philosophy and the social sciences, which is reflected not through the theoretical explanation or the theoretical researches, but should reflect the connotation of its own through the form of manifestation of the specific voices. At present, in the vocal music teaching in our country, different teachcrs will carry out the explanation combined with the related theoretical knowledgc and their own experience in the vocal music teaching. In the theoretical teaching, often they will use the related Irainlng methods, and the application of the training methods fully shows the quality of the teaching work, which will often under the influence of the stage art practice. The theoretical teaching is only to impart the theoretical knowledge of the vocal music to the students, but in the aspect of the specific practice, wc will need the support of the stage art practice. In this paper, with the importance of the stage art practice in the vocal music teaching as the research object, based on the analysis of the present situation ofthc vocal music teaching, this paper discusscs the relationship bctween thc stage art practice and the vocal music teaching, and the specific application of the stage practice in the vocal music teaching, and analyzes the importance of the stage art practice in the vocal music teaching, in order to promote the application of the stage art practice in the teaching of the vocal music art, and improve the levels of the vocal music teaching in China.展开更多
基金Supported by the National Natural Science Foundation of China(Nos.41006110,41106155)
文摘The SMOS(soil moisture and ocean salinity) mission undertaken by the European Space Agency(ESA) has provided sea surface salinity(SSS) measurements at global scale since 2009.Validation of SSS values retrieved from SMOS data has been done globally and regionally.However,the accuracy of SSS measurements by SMOS in the China seas has not been examined in detail.In this study,we compared retrieved SSS values from SMOS data with in situ measurements from a South China Sea(SCS) expedition during autumn 2011.The comparison shows that the retrieved SSS values using ascending pass data have much better agreement with in situ measurements than the result derived from descending pass data.Accuracy in terms of bias and root mean square error(RMS) of the SSS retrieved using three different sea surface roughness models is very consistent,regardless of ascending or descending orbits.When ascending and descending measurements are combined for comparison,the retrieved SSS using a semi-empirical model shows the best agreement with in situ measurements,with bias-0.33 practical salinity units and RMS 0.74.We also investigated the impact of environmental conditions of sea surface wind and sea surface temperature on accuracy of the retrieved SSS.The SCS is a semi-closed basin where radio frequencies transmitted from the mainland strongly interfere with SMOS measurements.Therefore,accuracy of retrieved SSS shows a relationship with distance between the validation sites and land.
文摘Based on a variety of case histories of site investigations, including extensive bore hole data, laboratory testing and geophysical prospecting at more than 550 construction sites, an empirical formulation is proposed for the rapid determination of allowable bearing pressure of shallow foundations in soils and rocks. The proposed expression corroborates consistently with the results of the classical theory and is proven to be rapid, and reliable. Plate load tests have been also carried out at three different sites, in order to further confirm the validity of the proposed method. It consists of only two soil parameters, namely, the in situ measured shear wave velocity and the unit weight. The unit weight may be also determined with sufficient accuracy, by means of other empirical expressions proposed, using P or S -- wave velocities. It is indicated that once the shear and P-wave velocities are measured in situ by an appropriate geophysical survey, the allowable bearing pressure as well as the coefficient of subgrade reaction and many other elasticity parameters may be determined rapidly and reliably.
文摘As a special art of the music performances, the vocal music is different from the philosophy and the social sciences, which is reflected not through the theoretical explanation or the theoretical researches, but should reflect the connotation of its own through the form of manifestation of the specific voices. At present, in the vocal music teaching in our country, different teachcrs will carry out the explanation combined with the related theoretical knowledgc and their own experience in the vocal music teaching. In the theoretical teaching, often they will use the related Irainlng methods, and the application of the training methods fully shows the quality of the teaching work, which will often under the influence of the stage art practice. The theoretical teaching is only to impart the theoretical knowledge of the vocal music to the students, but in the aspect of the specific practice, wc will need the support of the stage art practice. In this paper, with the importance of the stage art practice in the vocal music teaching as the research object, based on the analysis of the present situation ofthc vocal music teaching, this paper discusscs the relationship bctween thc stage art practice and the vocal music teaching, and the specific application of the stage practice in the vocal music teaching, and analyzes the importance of the stage art practice in the vocal music teaching, in order to promote the application of the stage art practice in the teaching of the vocal music art, and improve the levels of the vocal music teaching in China.