通量均衡意义下中国大陆现今地壳垂直运动及梯度分布与构造活动的关系

本文在应绍奋等研究成果的基础上,利用作者所提出的方法重新处理了覆盖中国大陆(不包括海南省、台湾省等岛屿)900余万平方公里的垂直形变资料,给出了在通量均衡基准下中国大陆现今地壳垂直运动及其梯度的空间分布以及几大地块的平均速率和通量。由此得出以下认识:(1)现今地壳垂直运动与大陆所处的力场有较好的对应性。(2)现今地壳垂直运动具有明显的南升北降大趋势;以西部最为典型和强烈。(3)现今地壳垂直运动高梯度值带与地震带的分布有较好的吻合性。(4)现今地壳垂直运动的分群性与大陆各大地块的划分有较好的匹配性。     

桐峪含金断裂特征分析

在桐峪地区的含金断裂带中,动力变质岩内大量出现的波状消光、变形纹、变形条带、扭折等现象有力地证明它们是韧性断层。韧性断层无论在时间上还是空间上都呈波浪状。波浪运动使金矿富集于其产状由陡变缓和平面的拐弯处。这类矿床可称之为动力变质热液矿床。     

A final non-redundant catalogue for the 7C 151-MHz survey

We present a final unified catalogue for the 7C survey at 151 MHz with resolution  70 × 70 cosec(δ) arcsec²  . This has been constructed by amalgamating the existing catalogues derived from individual fields imaged at this resolution and eliminating redundancy in regions of mutual overlap. This is a non-trivial procedure because the flux in multiple-component sources may be fitted differently on alternative images, owing, for example, to differences in local noise and beam distortion. The final catalogue lists 43683 sources over an area of about 1.7 sr. Separate final catalogues have been published for the 7C Galactic Plane survey (7CG) and the lower-resolution survey of the low-declination strip  9^h < RA < 16^h, 20° < Dec < 35°  .     

Some estimates of the source counts at Planck Surveyor frequencies, using the 9C survey at 15 GHz

We have used multifrequency follow-up observations of a sample of extragalactic sources from the 9C survey at 15 GHz to make deductions about the expected source population at higher radio frequencies, such as those in the lower frequency bands of the Planck Surveyor satellite. In particular, we have made empirical estimates of the source counts at 22, 30, 43 and 70 GHz and compared these with both known data and current theoretical predictions. We have also made an estimate of the count at the Atacama Large Millimeter Array (ALMA) frequency of 90 GHz, with a view to assessing the possible population of point sources available for the phase calibration of that instrument.     

A Possible Periodicity in the Radio Light Curves of 3C 454.3

During the period 1966.5–2006.2 the 15GHz and 8GHz light curves of 3C 454.3 (z = 0.859) show a quasi-periodicity of ～12.8 yr (～6.9 yr in the rest frame of the source) with a double-bump structure. This periodic behaviour is interpreted in terms of a rotating double-jet model in which the two jets are created from the black holes of a binary system and rotating with the period of the orbital motion. The periodic variations in the radio fluxes of 3C 454.3 are suggested to be mainly due to the lighthouse effects (or the variation in Doppler boosting) of the precessing jets caused by the orbital motion. In addition, variations in the rate of mass accreting onto the black holes may be also involved.     

中国大陆现今垂直形变特征的初步探讨

利用GPS观测资料进行大范围的垂直形变特征研究是本文研究的重点。通过网络工程基准站和基本站的GPS观测资料，绘制了中国大陆的垂直速率等值线图像，并对中国大陆垂直运动特征进行了定性的分析，结果表明：中国大陆垂直运动在70％以上的区域表现为沉降运动，在青藏高原和除北京外的整个华北块体及燕山块体的垂直运动表现为隆升的趋势。中国大陆西北和东南、西南和东北的整体垂直运动呈一种斜对称状态。对基于GPS观测所得的等值线图与基于水观测所得的等值线图进行了比较，比较结果显示，除了华南块体外，二者在整体趋势上比较一致。     

Distant FR I radio galaxies in the Hubble Deep Field: implications for the cosmological evolution of radio-loud AGN

Deep and high-resolution radio observations of the Hubble Deep Field and flanking fields have shown the presence of two distant edge-darkened FR I radio galaxies, allowing for the first time an estimate of their high-redshift space density. If it is assumed that the space density of FR I radio galaxies at     is similar to that found in the local Universe, then the chance of finding two FR I radio galaxies at these high radio powers in such a small area of sky is < 1 per cent. This suggests that these objects were significantly more abundant at     than at present, effectively ruling out the possibility that FR I radio sources undergo no cosmological evolution. We suggest that FR I and FR II radio galaxies should not be treated as intrinsically distinct classes of objects, but that the cosmological evolution is simply a function of radio power with FR I and FR II radio galaxies of similar radio powers undergoing similar cosmological evolutions. Since low-power radio galaxies have mainly FR I morphologies and high-power radio galaxies have mainly FR II morphologies, this results in a generally stronger cosmological evolution for the FR IIs than the FR Is. We believe that additional support from the V / V _max test for evolving and non-evolving population of FR IIs and FR Is respectively is irrelevant, since this test is sensitive over very different redshift ranges for the two classes.     

鄂尔多斯地块西部构造研究中几个值得注意的问题

基于20世纪70—80年代对鄂尔多斯地块西部构造的研究,所得出的地块西部南北统一的东西挤压逆冲推覆构造模式,随着目前该区油气勘探实践发展及研究的逐渐深入,已经越来越难以解释地质实际问题。同时,地块西部统一的东西向运动及南北成带的构造模式值得认真推敲;该区不存在大规模的前陆盆地;关于横向构造带、南北分区以及南北运动模式等问题的相继提出,说明随着研究的不断深入,地块西部区域构造的复杂性和多样性值得重新审视。在分析总结该区构造特征及发育模式时需要不断地加强全面研究,并对原有的认识进行不断的补充、修订和完善。