The effects of recombinant eel growth hormone,methyltestosterone and L-thyroxine on the growth of red sea bream,Pagrosomus major

the effects of recombinant eel growth hormone (reGH), methyltestosterone (MT) and L-thyroxine (T4) on the growth of red sea bream,Pagrosomus major, were investigated. Administration of reGH to fry by immersion at 2 mg/1 for 2 h every 5 days resulted in significant increase in both weight and length, but the condition factor (CF) diminished relative to that of similarly treated controls over the 37 day treatment period. Immersion in 0.1 mg/l T4 also resulted in significant increase in both weight and length and higher survival rate of test fry compared to the controls. Immersion in MT had less effect on growth and high-dose resulted in high mortality. In the second study, injection of 2 μg reGH/(g·wk) caused a significant increase in the specific growth rate (SGR) of test red sea bream fingerlings relative to that of the controls during the 4—week treatment period and maintained the increasing trend over the post-treatment period (weeks 4–6). Injection of MT at a dosage of 1μg/(g·wk) resulted in a significant increase in SGR during the 4—week treatment period. Intramuscular injection of 0.1 μg T4/(g·wk) also resulted in a significant increase in weight. Injection of high-doses of MT and T4 inhibited growth and resulted in darkening skin, bulging eyes and thinning body. In muscle chemical composition, the treated groups had no significant differences compared to the controls, but the high-dose MT and T4 groups showed significant increases in lipid content. Potential practical methods for hormone application in fish culture are discussed.     

建立国产化地震地理信息系统

根据地震研究、预测、预报、抗震、减灾、救灾的需求，阐述了建立国产化地震地理信息系统的必要性。分析了目前地理信息系统在地震数据处理中的应用以及存在的问题，提出了解决问题的方案。     

Grid point search algorithm for fast integer ambiguity resolution

A Grid Point Search Algorithm (GRIPSA) for fast integer ambiguity resolution is presented. In the proposed algorithm, after the orthogonal transformation of the original ambiguity parameters, the confidence ellipsoid of the new parameters is represented by a rectangular polyhedron with its edges parallel to the corresponding axes. A cubic grid covering the whole polyhedron is then identified and transformed back to the original coordinate system. The integer values of the corresponding transformed grid points are obtained by rounding off the transformed values to their nearest integer values. These values are then tested as to whether they are located inside the polyhedron. Since the identification of the grid points in the transformed coordinate system greatly reduces the search region of the integer ambiguities, marked improvements are obtained in the computational effort. Received: 13 October 1997 / Accepted: 9 June 1998     

1917及1944年鸭绿江口的两次历史强震

本文根据发掘的地震史料,较详细地介绍了１９１７年及１９４４年发生在辽宁丹东南鸭江口的两次历史地震,并且圈绘了这两次地震在沿海陆地上烈度影响范围图。     

朝鲜半岛三次历史强震

本文是在整理朝鲜半岛地震史料的基础上,着重对其发生的１５４６年１３／２级地震,１６８１年７级地震、１８１０年２９／４级地震等做了详细介绍,并尝试的给出等震线图。     

1996年岁末沪宁线持续五天大雾的原因探讨

1996年12月27-31日江苏境内发生了持续五天的大雾。本文普查了天气图,分析了产生雾的天气形势特征,并进行了一些物理量的计算,制作了时空分布和垂直剖面图,重点分析了它的形成和长时间维持的原因,对冬季辐射雾的预报有一定参考价值。     

大别山麻粒岩包体的氧同位素研究

对北大别变质杂岩中的麻粒岩包体进行详细的氧同位素地球化学研究,发现其全岩δ~(18)O值偏低,为3.3‰～4.4‰。在麻粒岩相变质条件下,大别山麻粒岩包体的共存矿物对之间达到并保存了氧同位素平衡,后期退变质作用未明显破坏这种平衡。由矿物氧同位素地质测温得到的顶峰变质温度800～875C,与一般麻粒岩相变质温度相吻合。在变质作用之前或顶峰变质作用过程中,大别山麻粒岩包体的原岩曾与一δ~(18)O值低于3‰的外来流体发生了高温水—岩交换作用,并且这种交换作用在一定范围内是相对均一的。     

利用灰色聚类判定沉积环境

利用测井曲线确定相应岩层形成时的沉积环境,常因曲线并非典型模式及所携带有关沉积环境的地质信息不完全所困扰。认为这种信息不全的实质是灰色系统理论中“灰”的基本含义,提出了用灰色聚类分析法判定沉积环境。并用以对山东阳谷--茌平煤田聊城勘探区山西组S₂砂岩层形成环境进行判定,取得较好结果。同时,对灰色综合关联度作为聚类指标进行了探讨。     

Effect of equation of state and shock energy loss on SN II explosions

We consider the effect on the adiabatic gravitational collapse of stellar cores of large mass due to (1) the use of different equations of state and (2) the inclusion of energy loss of shock. We find that different equations of state give very different central densities at rebounce and amplitudes of rebounce. When shock energy loss is not considered, all the equations discussed here will lead to explosions, but when it is considered, small amplitude rebounces will not do so.     

Biochemical evidence for genetic relationship between the bisexual and parthenogenetic Artemia in China

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