In this paper, we analyse one photoelectric record of the occultation of SAO150330 by Comet P/Crommelin on the night of 1 April, 1984. There are two secondary occultations around the main one, which were probably caused by two jets.
From April to July 2003 and 2004, we surveyed the nest-site selection of the White Eared pheasant (Crossoptilon crossoptilon) in the Zhujie Monastery and in the mountain facing it in Sichuan Province, China.
The precipitation, runoff, and normalized difference vegetation index (NDVI) data of six catchments were accumulated from April to September in 1992, 1993, and 1995.
The feeding habitat selection of blue sheep (Pseudois nayaur) was studied by direct observation method in the Helan Mountains, China during winter (from November to December) and spring (from April to June) from 2003 to 2004.
In this paper the ionospheric data during the solar eclipse on 19 april 1958 at Wuhan is analyzed.Changes of the electron density and recombina- tion coefficient of E-layer and radiation source have also been discussed.
本文作者利用1958年4月19日在武汉日食时的电离层观测资料,计算了电子数密度的变化和 E 层的复合系数,且也讨论了 F_2层的反常和幅射源的分布。
Photometric observations of Nova Her 1963 were started in Peking on Feb.18, 1963,with a photoelectric photometer mounted on a 15 cm aluminized Cassegrain reflec- tor.The Nova was observed in the ultraviolet,blue,yellow,and red as well as through four relatively narrow-band filters whose commercial type designations being S43,S47, S50 and S53,with maximum transmissions of the cell-field lens-filter combination at about 4300,4550,4850 and 5230(?) respectively. Table 1 lists the types and parameters of the fil...
The following model has been suggested for cosmic γ-ray burst: Cosmic γ-ray burst is an event analogous to solar flare, but much more drastic in scale; the magnetic energy stored in stellar "flare" is converted into kinetic energy of electrons during burst; a great number of relativistic electrons rush out from stellar "flare" within a very short time; Inverse-compton photons are produced in the collision between these relativistic electrons and the ambient photons which have been emitted from the stellar p...