Report on discovery of new Seyfert galaxies

We report our discovery of new active galaxies in a small sample of 23 sources with 2.16 m telescope at Beijing Astronomical Observatory. After wavelength and flux calibration, they are classified by their degree of nuclear activities: one Seyfert 1, three Seyfert 2s, six Seyfert 3s, Seven HII galaxies and one possible Seyfert 3.     

东江三角洲地貌特征

本文应用地貌学、年代学、沉积学、历史地理学等方法,讨论了东江三角洲的范围,分析了周边地貌和三角洲地貌的特征,研究了构造、气候、河流、海洋诸因素对地貌发育的影响,提出了地貌发育过程的5个阶段的新看法。     

Spike emission at 21 cm wavelength in post-flare loops

Electron-cyclotron maser instability produced by accelerated energetic electrons is today's most favoured process for spike emission on ultra-short time scales at dm wavelengths. The process of electron acceleration occurs primarily in pre-impulsive and impulsive phases. We present observations of spike bursts at 21 cm in a limb event that occurred in AR 5629 on 1989 August 17. Optical observations of the event from Beijing Astronomical Observatory show coronal loops that interact just before the spike groups appeared. This implies that additional particle acceleration might be produced by the interaction between emerging loops and original large loops, and become the source of the energetic electrons responsible for the spike emission appearing in the descending phase. Some important parameters are deduced.Paper presented at the 4th CESRA workshop in Ouranopolis (Greece) 1991.     

F07164+5301: an ESB source with WR features

We report on a new ESB source, as defined by Allenet al. (1991), with Wolf-Rayet (WR) bands in its optical spectrum. The WR bump at 4605-4686 is detected. The bump consists of broad HeII 4686, NV4605-4619, NIII4634-41, and possibly, CIII4647-52 emission. The narrow nebular lines are clearly discernable on our spectrum. The number of WR stars derived from the luminosity of HeII4686 is about 8100. The oxygen abundance is about 9.06×10^–4, greater than the solar value.     

腾冲火山活动区的地震活动性研究

本通过对腾冲火山活动区及邻区的地震活动性研究。得出如下明显特征;（１）腾冲火山地区的中强地震活动与周边地区有显差异。中强地震主要发生在火山活动区以南的龙陵地区和以西的中缅交界地区。９２）腾冲火山活动中强地震极少,以中、小地震活动为主。另外, 腾冲县城１５１２－１７８５年曾发生５次中强地震。（３）该区长期应变释放相当平缓。（４）腾冲火山活动区ｂ值较高,长期处于低应力背景状态下     

地震发生中长期预测中的非稳态泊松模型

基于实际地震的发生在一个活动期内具有加速活动的特点 ,作者提出一种非稳态泊松模型。与稳态泊松模型中地震发生率 ν为常数相对应 ,该模型中地震发生率 ν是随时间呈指数性增加。采用对数似然方法 ,通过使其最大化来确定模型的参数。作者以一个假想的时间序列 ,讨论了非稳态与稳态泊松模型之间的差别 ,并将该模型实际应用于华北地区汾渭地震带和华北平原地震带的中长期预测中     

对计算土壤和岩石中氡浓度及其表面析出率表面边界条件的讨论

本文对求解土壤或岩石中氡浓度及其表面析出率的边界条件进行了探讨。以空气中无穷远处氡浓度为零（空气中无氡源）的自然边界条件代替空气与土壤或岩石交界面氡浓度为零的边界条件,给出了土壤和岩石中氡浓度及其表面析出率的具体表达式。与前人研究结果比较,该式中增加了一项,表面氡析出率缩小了一个倍数。通过对土壤、岩石的具体计算．表明两种边界条件的计算结果有相当的偏差。同时,文中还讨论了在两类边界条件下对流对土壤或岩石中氡浓度及其表面析出率计算的影响。     

Contemporary climatic change over the qinghai-xizang plateau and its response to the green-house effect

Ｉ．ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｇｌｏｂａｌａｖｅｒａｇｅｓｕｒｆａｃｅａｉｒｔｅｍｐｅｒａｔｕｒｅｏｆｔｈｅｅａｒｔｈｈａｓｉｎｃｒｅａｓｅｄｂｙａｂｏｕｔ０．５℃ｓｉｎｃｅｔｈｅｍｉｄ１９ｔｈｃｅｎｔｕｒｙ（Ｈｏｕｇｈｔｏｎｅｔａｌ．,１９...     

辽宁农作物的生物地球化学分类

根据А．П．维诺格拉多夫的动植物体化学组成分类方法,对辽宁省４５种农作物及其立地土壤中的５２种化学元素进行了定量分析测试后,采用双指标法将元素的含量与生物吸收系数各分成三个数值段,从而将辽宁主要农作物化学元素划分成最富集元素、富集元素、贫乏元素及最贫乏元素４种类型,并作出农作物化学元素分类表,然后再将其转变成农作物生物地球化学分类表。表中列出了５２种化学元素在各种农作物中的含量及其生物吸收系数组合,并由此将辽宁主要农作物分为元素最富集作物、元素富集作物、元素贫乏作物和元素最贫乏作物四类。根据农作物的生物地球化学分类,人们可以科学地调整农业种植结构,可以均衡人体营养结构。它不仅可以为环境质量监测提供指示植物标志而且对植物地球化学探矿也具有重要的参考价值。     

九孔鲍外套膜表皮细胞的超微结构

利用透射电镜观察九孔鲍（Haliotidaediversicoloraquatilis）的外套膜表皮细胞,结果表明细胞可分为4大类,即普通柱状表皮细胞、嗜碱性粒细胞、嗜酸性粒细胞和感觉细胞。它们在不同区域的分布、形态和数量变化与外套膜的功能分化密切相关。