Evidence for evolution in the clustering of quasars

We discuss the changes in the amplitude of the correlation function of quasar clustering with the redshift. Using the new Hewitt-Burbidge QSO catalogue, we find from a statistical analysis of the quasar pairs that the positive results of quasar clustering are mainly contributed by low-redshift quasars. There is an obvious change in the quasar distribution at z = 2. There is no clustering for z > 2. The difference in clustering is not due to any selection effect on the brightness. The evidence is that quasar clustering evolved with cosmological time.     

Statistical analysis of correlation between the positions of quasars and the uppsala galaxies

The question of the association of quasars with galaxies is re-examined using 785 quasars at |b| 30, δ − 02°30′ in the new Hewitt and Burbidge Catalog (1980) and all galaxies in the “Uppsala General Catalogue of Galaxies” (Nilson, 1973). The results of the two-point cross-correlation function are presented and they show that there are on the average 0.153 ± 0.011 more galaxies within 10'.0 of a QSO than would be expected if the QSOs were distributed randomly. We find the marginal significance of the tendency for correlation between QSOs and galaxies to increase with increasing redshifts z or apparent magnitudes V. The nearest neighbor test has also been taken to analyse the same data as well as get further evidence for the apparent association between QSOs and galaxies.     

Periodic redshift distribution of quasars associated with low — redshift galaxies

We applied power spectral analysis to the redshift distribution of the quasars associated with low-redshift galaxies. Periodicity is confirmed at a level of confidence >99%, with a period of Δln(1+z) = 0.206. This result is exactly the same as previously found for different quasar samples. The periodicity is not caused by any selection effect in the emission lines. The two phenomena, the periodicity in the redhsift distribution and the association of quasars with low-redhsift galaxies can both be rather well explained by a multiply-connected model of the universe.     

旅游地开发评价研究

旅游地开发评价是旅游开发中的一个重要课题,也是旅游地理学的重要研究内容之一。本文初步探讨了旅游地开发评价的方法论,并尝试建立中国旅游地开发评价系统。     

Some characteristics of pulsars with long pulse nulling

Taking pulsars with long pulse nulling as forming a special group, we found that those with pronounced nulling are located on a line near and parallel to the radio cut-off in the 1gP — 1gP diagram. This in turn suggests a reason for the nulling. They are also shown to have smaller than average fields at the light cylinder and to have smaller than average rates of energy dissipation.     

The Moon's zonal tidal effect in the variation of the earth's spin rate

Using the time observations obtained by 8 instruments in the Chinese Joint System during the years 1966–1980, we analyse the Moon's zonal tidal effect. The results show that the effects of the M_f and M_m waves are obvious. From this, the parameters $\text{K}\text{C}$ of the zonal tide are estimated and the weighted averages of the 8 instruments are $\text{(}\text{K}\text{C}\text{)}\text{M}{}_{\mathrm{f}}\text{= 0.909 ± 0.114}\text{and}\text{(}\text{K}\text{C}\text{)}\text{M}{}_{\mathrm{m}}\text{= 0.905 ± 0.083}$ respectively.     

安徽沿江地区铜金多金属矿化系列及其相互关系

安徽沿江地区是长江中下游成矿带的主要地段之一，矿产资源十分丰富。本文在系统划分该区矿床类型和矿化系列的基础上，分析了矿化系列的演化及其间的相互关系。     

Electron-positron annihilation lines and decaying sterile neutrinos

If massive sterile neutrinos exist, their decays into photons and/or electron-positron pairs may give rise to observable consequences. We consider the possibility that MeV sterile neutrino decays lead to the diffuse positron annihilation line in the Milky Way center, and we thus obtain bounds on the sterile neutrino decay rate Γ _e ≥10⁻²⁸ s⁻¹ from relevant astrophysical/cosmological data. Also, we expect a soft gamma flux of 1.2×10⁻⁴–9.7×10⁻⁴ ph cm⁻² s⁻¹ from the Milky Way center which shows up as a small MeV bump in the background photon spectrum. Furthermore, we estimate the flux of active neutrinos produced by sterile neutrino decays to be 0.02–0.1 cm⁻² s⁻¹ passing through the earth.     

低空热红外遥感在探测输油管道中的应用

针对采用常规地面探测方式探测地下输油管道工作量大,需要花费大量人力、财力和时间等问题,该文论证利用无人机搭载热红外遥感探测地下输油管道的可行性。具有较高温度的石油在地下管道运行时不断向周围扩散热量,可在地表形成温度明显高于背景温度的热扩散异常带,根据这一原理,采用红外热成像法探测地下输油管道,实现其位置的定位;随着低空无人机遥感技术的发展,将无人机和热红外遥感技术结合,通过数据后处理和影像解译,实现快速较大面积的输油管道探测。选择天津市大港油田某一区域作为试验区,制定完整的技术流程,共发现地下输油管道134条,补充完善了已有管线资料,具有良好的应用效果。