The newly-raised problem as to whether our Galaxy may contain a thick disk population component has aroused great interest. But up until now no conclusion has been reached unanimously for lack of observed data. Here t...The newly-raised problem as to whether our Galaxy may contain a thick disk population component has aroused great interest. But up until now no conclusion has been reached unanimously for lack of observed data. Here this problem is discussed based on seven Basel field data calibrated recently and strong evidence is provided. New results on the values of structural parameters, luminosity functions and metal structure of the thick disk are also presented.展开更多
Ⅰ. INTRODUCTION The rate of periodical change, (?), is one of the most important parameters for pulsars, for it provides a lot of valuable information for studying the physical processes of them. At present, the intr...Ⅰ. INTRODUCTION The rate of periodical change, (?), is one of the most important parameters for pulsars, for it provides a lot of valuable information for studying the physical processes of them. At present, the intrinsic mechanisms of pulsar radiation展开更多
One of the most important tasks of modern geodynamical research lies in the precise determination of solid tide motions. Studies of the effects of solid tide motions of an astronomical station on observational data of...One of the most important tasks of modern geodynamical research lies in the precise determination of solid tide motions. Studies of the effects of solid tide motions of an astronomical station on observational data of pulsar have shown that the change of pulse period (p) and its change rate (p) caused by the solid tides are not negligible. A numerical analysis for Arecibo Observatory as an example indicates that this kind of effects overlapped on the period and its rate enters directly into the observational results. Based on this investigation a new method of solid tide research and determination by means of the analysis of p and p of pulsars is put forward. The successful implement of this method will open up a new area of solid tide research and provide some results comparable with those given by other contemporary methods and some special ones.展开更多
1 Plate Motions and Earthquakes Modern space technology such as very long baseline interferometry (VLBI), satellite laser ranging (SLR) and global positioning system (GPS) opens a new way to measure and study the eart...1 Plate Motions and Earthquakes Modern space technology such as very long baseline interferometry (VLBI), satellite laser ranging (SLR) and global positioning system (GPS) opens a new way to measure and study the earth’s motions with high accuracy. It is one of the frontiers of today’s earth sciences to use these space technologies to learn plate-scale tectonics, kinematics and dynamics. During the 1980s, the NASA Program in Crustal Dynamics succeeded展开更多
The P of pulsars provides important information for studying their physical processes. In an all-round way the effect of the Galactic rotation on the measured P of pulsars is studied. It is shown that among 706 pulsar...The P of pulsars provides important information for studying their physical processes. In an all-round way the effect of the Galactic rotation on the measured P of pulsars is studied. It is shown that among 706 pulsars discovered so far there are 16 pulsars whose measured values of P have been affected by the Galactic rotation. So, it is necessary to make the corresponding corrections for those pulsars.展开更多
文摘The newly-raised problem as to whether our Galaxy may contain a thick disk population component has aroused great interest. But up until now no conclusion has been reached unanimously for lack of observed data. Here this problem is discussed based on seven Basel field data calibrated recently and strong evidence is provided. New results on the values of structural parameters, luminosity functions and metal structure of the thick disk are also presented.
文摘Ⅰ. INTRODUCTION The rate of periodical change, (?), is one of the most important parameters for pulsars, for it provides a lot of valuable information for studying the physical processes of them. At present, the intrinsic mechanisms of pulsar radiation
文摘One of the most important tasks of modern geodynamical research lies in the precise determination of solid tide motions. Studies of the effects of solid tide motions of an astronomical station on observational data of pulsar have shown that the change of pulse period (p) and its change rate (p) caused by the solid tides are not negligible. A numerical analysis for Arecibo Observatory as an example indicates that this kind of effects overlapped on the period and its rate enters directly into the observational results. Based on this investigation a new method of solid tide research and determination by means of the analysis of p and p of pulsars is put forward. The successful implement of this method will open up a new area of solid tide research and provide some results comparable with those given by other contemporary methods and some special ones.
文摘1 Plate Motions and Earthquakes Modern space technology such as very long baseline interferometry (VLBI), satellite laser ranging (SLR) and global positioning system (GPS) opens a new way to measure and study the earth’s motions with high accuracy. It is one of the frontiers of today’s earth sciences to use these space technologies to learn plate-scale tectonics, kinematics and dynamics. During the 1980s, the NASA Program in Crustal Dynamics succeeded
基金Project supported by the National Natural Science Foundation of China (Grant No. 19733001)
文摘The P of pulsars provides important information for studying their physical processes. In an all-round way the effect of the Galactic rotation on the measured P of pulsars is studied. It is shown that among 706 pulsars discovered so far there are 16 pulsars whose measured values of P have been affected by the Galactic rotation. So, it is necessary to make the corresponding corrections for those pulsars.
