On the basis of frequency domain sounding, the present paper has put forward the multifrequency sounding method so as to realize multifrequency on one computer and simultaneous observation, thus raising the observation speed.
The MSX infrared dark cloud, G79.2+0.38, has been observed over a region of 11'× 7' in the J = 1 - 0 rotational transition lines of 12COand its isotopic molecules, 13COand C18O.
The results of comparison of the characteristics of sharp boundaries of small-scale and medium-scale solar wind structures in the case of their simultaneous observation on widely spaced spacecraft are described.
Through simultaneous observation of light-induced EPR-and optical absorption changes, the corresponding optical absorption bands are established as fingerprints of the defect charge states.
A measurement profile consisted of 5 sites from Xinyang to Tangyin in Henan Province was set up in September of 1996 to carry out simultaneous observation of Pi2 geomagnetic pulsations.
In the study of ionospheric drift, the first-order echoes of radiowave reflected vertically from the ionosphere are usually employed. In this paper, attention is drawn to the possibility to deduce the parameters of ionospheric irregularities and drift from the fading records of second-order echoes observed by three close-spaced receivers. The author considered the reflection of radiowave from the ionosphere as diffraction by an equivalent screen on which the wave field is distributed at random. It is shown ...
The internal friction peaks in Al-0.5wt%Cu alloys were observed near 0℃ and 90℃ respectively under forced bending vibration within the audio frequency range and the amplitude internal friction peaks were observed at 6℃ and 90℃. It may be considered as an anomalous internal friction phenomenon showing both temperature peaks and am-plitude peaks. It is suggested that the peaks may be associated with the motion of disloca-tions dragged by point defects.
We observed a great eruptive loop-prominence on the solar western limb (its location was about SESC No:3049 (15 N, 150 L)) during 08h16m-09h51mUT on April 27, 1981, using our Lyot-type Ha chromospheric telescope. Our observational results arc as follows :1.The loop-like structure appeared before 08h16m, the bright patch of flare-like appeared in the outsides of foot points. At 08h16m, another weak loop structure appeared about 2' north at the main loop.2.In the period of 08h16m-08h26m30s, 08h30m-08h37m and ...