A hyperbolic Lindstedt-Poincare method is presented to determine the homoclinic solutions of a kind of nonlinear oscillators, in which critical value of the homoclinic bifurcation parameter can be determined. The gene...A hyperbolic Lindstedt-Poincare method is presented to determine the homoclinic solutions of a kind of nonlinear oscillators, in which critical value of the homoclinic bifurcation parameter can be determined. The generalized Lienard oscillator is studied in detail, and the present method＇s predictions are compared with those of Runge-Kutta method to illustrate its accuracy.展开更多
This paper focuses on the research on the vocabularies in the modem Chinese monograph with the division of history into periods and the special classes of the ancient codes and records. ＂Exploitation of the Works of ...This paper focuses on the research on the vocabularies in the modem Chinese monograph with the division of history into periods and the special classes of the ancient codes and records. ＂Exploitation of the Works of Nature＂ is China＇s first encyclopedia on the production technologies of the agricultural and handicraft industries, published in 1637, with the contents covering many fields of the social production. It can fully reflect the terminologies of various industries in the late Ming Dynasty and the early Qing Dynasty and the real situation of the language at that time, which has a very high value of the linguistic research. The article extracts 5573 double-character compound words from the whole book, and uses the method of the quantitative analysis and the qualitative analysis to study the vocabularies of the whole book. Limited by the length of the text, the article carries out the investigation and analysis with the supplementary double-character words as the examples.展开更多
Prior to achieving high precision navigation of a spacecraft using X-ray observations, a pulsar rotation model must be built and analysis of the precise posi- tion of the Earth should be performed using ground pulsar ...Prior to achieving high precision navigation of a spacecraft using X-ray observations, a pulsar rotation model must be built and analysis of the precise posi- tion of the Earth should be performed using ground pulsar timing observations. We can simulate time-of-arrival ground observation data close to actual observed values before using pulsar timing observation data. Considering the correlation between the Earth＇s position and its short arc section of an orbit, we use polynomial regression to build the correlation. Regression coefficients can be calculated using the least square method, and a coordinate component series can also be obtained; that is, we can calcu- late Earth＇s position in the Barycentric Celestial Reference System according to pulse arrival time data and a precise pulsar rotation model. In order to set appropriate param- eters before the actual timing observations for Earth positioning, we can calculate the influence of the spatial distribution of pulsars on errors in the positioning result and the influence of error source variation on positioning by simulation. It is significant that the threshold values of the observation and systematic errors can be established before an actual observation occurs; namely, we can determine the observation mode with small errors and reject the observed data with big errors, thus improving the positioning result.展开更多
The concept of motivation has been rejected by many formalist linguists as irrelevant,or at least,negligible.It is argued in this article that motivation deserves a place of honor in linguistic theorizing.After an int...The concept of motivation has been rejected by many formalist linguists as irrelevant,or at least,negligible.It is argued in this article that motivation deserves a place of honor in linguistic theorizing.After an introduction to various semiotic types of motivation based on previous work by Günter Radden and the present author,constructions with perception verbs in English and Spanish are analyzed.These constructions provide evidence for the hypothesis that lexicogrammatical form is often motivated conceptually.Consequently,contrary to the dogma of autonomous syntax,semantic and pragmatic information has to be built into the formulation of lexicogrammatical regularities.展开更多
基金supported by the National Natural Science Foundation of China (10672193)Sun Yat-sen University (Fu Lan Scholarship)the University of Hong Kong (CRGC grant).
文摘A hyperbolic Lindstedt-Poincare method is presented to determine the homoclinic solutions of a kind of nonlinear oscillators, in which critical value of the homoclinic bifurcation parameter can be determined. The generalized Lienard oscillator is studied in detail, and the present method＇s predictions are compared with those of Runge-Kutta method to illustrate its accuracy.
文摘This paper focuses on the research on the vocabularies in the modem Chinese monograph with the division of history into periods and the special classes of the ancient codes and records. ＂Exploitation of the Works of Nature＂ is China＇s first encyclopedia on the production technologies of the agricultural and handicraft industries, published in 1637, with the contents covering many fields of the social production. It can fully reflect the terminologies of various industries in the late Ming Dynasty and the early Qing Dynasty and the real situation of the language at that time, which has a very high value of the linguistic research. The article extracts 5573 double-character compound words from the whole book, and uses the method of the quantitative analysis and the qualitative analysis to study the vocabularies of the whole book. Limited by the length of the text, the article carries out the investigation and analysis with the supplementary double-character words as the examples.
基金supported by the National Natural Science Foundation of China (Grant Nos. 10973030,10973032,11003039,10903032 and 10973049)the National Science Foundation of Shanghai,China (Grant No. 10ZR1435700)
文摘Prior to achieving high precision navigation of a spacecraft using X-ray observations, a pulsar rotation model must be built and analysis of the precise posi- tion of the Earth should be performed using ground pulsar timing observations. We can simulate time-of-arrival ground observation data close to actual observed values before using pulsar timing observation data. Considering the correlation between the Earth＇s position and its short arc section of an orbit, we use polynomial regression to build the correlation. Regression coefficients can be calculated using the least square method, and a coordinate component series can also be obtained; that is, we can calcu- late Earth＇s position in the Barycentric Celestial Reference System according to pulse arrival time data and a precise pulsar rotation model. In order to set appropriate param- eters before the actual timing observations for Earth positioning, we can calculate the influence of the spatial distribution of pulsars on errors in the positioning result and the influence of error source variation on positioning by simulation. It is significant that the threshold values of the observation and systematic errors can be established before an actual observation occurs; namely, we can determine the observation mode with small errors and reject the observed data with big errors, thus improving the positioning result.
文摘The concept of motivation has been rejected by many formalist linguists as irrelevant,or at least,negligible.It is argued in this article that motivation deserves a place of honor in linguistic theorizing.After an introduction to various semiotic types of motivation based on previous work by Günter Radden and the present author,constructions with perception verbs in English and Spanish are analyzed.These constructions provide evidence for the hypothesis that lexicogrammatical form is often motivated conceptually.Consequently,contrary to the dogma of autonomous syntax,semantic and pragmatic information has to be built into the formulation of lexicogrammatical regularities.
