Project supported by the National Natural Science Foundation of China
Considerable attention has recently been devoted to the representation for offset curves.Farouki and Sakkalis studied a class of curves called Pythagorean hodograph curves (PH curves), which have rationally parameteri...
Project Supported by the National Natural Science Foundation of China;863 Network Laboratories.
The sensor’s dynamic characteristic is very important. Now, however, sensor is designed according to static performance indexes, and is evaluated on the basis of static calibration. Therefore, the dynamic performance...
Ⅰ. INTRODUCTION Shaanxi Astronomical Observatory, Academia Sinica (CSAO), has been disseminating the Loran-C signals of BPL with very high power since 1983. We have received the signals of LC/9970-Y, LC/5970-Z and BP...
The high degree of accuracy of the atomic hydrogen maser is one of its main properties, which is of great significance both in theory and in practice. Ordinarily the output frequency of a hydrogen maser, fqut.