Estimation of energy of supernovae in large and small Magellanic clouds     

Yin Qi-feng  Luo Shao-guang 《Chinese Astronomy and Astrophysics》1985,9(4):307-310

Based on the theory of the radio evolution of supernova remnants and the theory of x-ray emission, we have derived an expression for the energy of supernova eruption directly in terms of the observed radio flux density and x-ray luminosity. This method is used to estimate the energy of the supernova explosions in LMC and SMC. Our calculated values fall in the range 10⁴⁹ – 10⁵¹ ergs, with the values for Type I supernovae systematically smaller than those for Type II, at about 10⁴⁹ ergs. We point out that the most likely cause for the discrepancy between the statistical and theoretical N-D relations is incompletness of data. We also point out, in the two clouds, the vast majority of large sources are still in the phase of adiabatic expansion.  相似文献   

Model JDC1-1 precision conductivity ratio measurement system     

Luo Jiuru 《Oceanic Engineering, IEEE Journal of》1985,10(3):324-331

A precision conductivity ratio measurement system (PCRMS) has been developed. Its use and principle of operation are presented and the principles, features, and specifications of the key components of the system are described in detail. Special emphasis is placed on the procedures for calibration and testing of the equipment. The overall results of evaluation show that the equipment has a sensitivity of 0.0001 S, a precision of better thanpm0.0003S, and an accuracy of better thanpm0.001S over the salinity range of 2-42.  相似文献   

The evolution of the Magellanic clouds     

Ju. L. Frantsman 《Astrophysics and Space Science》1988,145(2):287-292

The observed maximum luminosities of AGB stars in the Magellanic Cloud clusters were compared with luminosities obtained theoretically in order to estimate the ages of the clusters. Several rates of mass loss by AGB stars are considered. The ages for 10 clusters in the SMC and 25 in the LMC are presented in the tables with the compilations of ages from the literature quoted. The discrepancies between ages derived from the AGB peak luminosities and from the Main-Sequence turn off and maximum luminosity are explained by allowing for intensive mass-loss during the AGB evolutionary phase. The method is useful only if the brightest star is on the thermally pulse AGB phase but not in the early-AGB phase.  相似文献   

浅析造礁生物演化及生物绝灭事件对礁丘发育的控制作用──以中国南方震旦纪至三叠纪生物礁丘为例     

金善燏  鞠天吟  杨达铨  林国为  陆俊明 《浙江国土资源》1996,(1)

造礁生物演化经历了六个主要发展阶段，具有全球性演化规律特征，其盛衰变化在中国南方礁丘的时代分布上反映较为醒目。早泥盆世至晚泥盆世早期，为生物礁发育的首次鼎盛期，已发现的礁体达９７个，而至今尚未发现晚泥盆世晚期（法门期）的生物礁；二叠纪是第二次鼎盛期，已发现该时期的礁丘达１４８个之多，生物特征明显，而至今也尚未发现早三叠世时期的礁体。中国南方这一礁丘时代分布特征恰好与 Ｆ／Ｆ和Ｔ／Ｐ两次全球性巨大生物绝灭事件相吻合。因此在南方寻找生物礁型油气藏时，除了应当重视本区构造演化的控制作用外，还应极大地注意全球性生物演化规律的控制作用。  相似文献   

1988年澜沧─耿马地震与滇西实验场的重力变化     

吴国华  罗增雄  赖群  罗伯华 《大地测量与地球动力学》1995,(2)

本文对澜沧─耿马大地震前后滇西实验场的重力场时空变化特征进行了初步分析，结果表明，地震之前，滇西实验场的重力变化有一个上升、下降的变化过程，地震发生在重力变化下降时段，震后迅速恢复。  相似文献   

山东省焦家金矿田地球物理综合信息的研究与找矿          下载免费PDF全文

牛如宝  罗卫 《山东国土资源》1995,(1)

本文是在研究胶东蚀变岩型金矿的矿田地球物理找矿模型基础上论述了焦家金矿田上磁场、电场、重力场的分布特征及通过位场转换所提取的各种信息，并阐述其与成矿的关系，提出了用航磁资料圈定找矿靶区的新认识，即在磁性岩体的边缘部及其附近进行找矿。并结合研究地质资料，认为郭家岭花岗闪长岩是控制金矿生成的岩体。  相似文献   

Radio observations of the OH line in Comet Halley     

Luo Xian-han  Zhou Ti-jian  Yao De-yi

Du Sheng-fu

Qian Zhi-han  Ji De-sheng  Zhang Wei-min 《Chinese Astronomy and Astrophysics》1988,12(4):324-327

  相似文献   

NUMERICAL CLASSIFICATION OF REGIONAL STRUCTURE OF AGRO-ECOSYSTEM IN GUANGDONG     

罗曼嘉 《中国地理科学(英文版)》1991,1(2):154-165

On the basis of "The Statistical Data of Guangdong Province in 1981" and the 14 selected original variables, 107 counties and suburbs in Guangdong are classified. In the classification, cluster analysis is applied, and the cluster hierarchy of the agro-ecosystem is achieved with a computer. According to output level, planting structure, and input level of energy, there is an evident regionalism in the agro-ecosystem of Guangdong, which presents approximately concentric circles centralized by Guangzhou City.  相似文献   

Economic viability of Asia-Europe container transport through Arctic routes based on Arctic sea ice          下载免费PDF全文

Luo Qiaoyun  Liu Wei  Shou Jianmin 《极地研究》1988,31(4):447

  相似文献   

Combined radiation mechanism in the sun's active region No. 75 during the eclipse of 16 February, 1980     

Shuchen Ji  Renyang Zhao  Zhou Li  Xianhan Luo 《Astrophysics and Space Science》1993,200(2):239-250

We assume that the physical conditions above an active solar region vary continuously from the centers of sunspots to the adjacent quiet region and try to take into account the influence of the magnetic field. Thus we calculate the three-dimensional distribution of the electron temperature and density based on the radio spectrum of active region No. 75 obtained from the solar eclipse observation of 16 February, 1980. If we assume a potential field, we calculated the magnetic field above the active region in terms of the solar photospheric magnetic field.Using the electron temperature, density, and the magnetic field as described above, and assuming the slowly varying radiation mechanism to consist of bremsstrahlung and gyro-resonance radiation, we obtained the flux density spectrum and the brightness temperature spectrum. The calculated results are essentially consistent with the observations.  相似文献