红拟石首鱼的中间培育和养成技术

目前，红拟石首鱼的养殖业正在发展，前景看好。该鱼的亲鱼可以在圈养条件下进行培育，可根据需要进行产卵，生产仔鱼。中间培养生产包括饵料生物培养以及仔鱼长到全长２５ｍｍ养成生产包括池塘养殖、网 箱养殖和闭合循环水槽系统密集养殖。     

全球大洋循环与热通量的估算

虽然大洋循环以及随之发生的热和气与大气圈的交换对气候影响强烈，而且全球循环的讨论前人已有很好的模式，但还缺乏定量性以及研究区的资料仍相互矛盾．这里我们提出一种全球大洋循环的规模和结构及其伴随的热通量的估算与动力和运动学相一致的模式，这种模式是由快速空间变化的水文流速数据综合得出的．我们发现没有单一的水体倒转单元，而是由一个复合的和可能随时间变化的循环类型所替代．最简单的解释表明存在两个近乎独立的单元：一是大西洋水体倒转通过南部大洋与其它盆地连接：另外一个是印度洋和太平洋盆地通过印度尼西亚群岛相联…     

Microbenthic distribution of Proterozoic tidal flats: environmental and taphonomic considerations

Silicified carbonates of the late Mesoproterozoic to early Neoproterozoic Society Cliffs Formation, Baffin Island, contain distinctive microfabrics and microbenthic assemblages whose paleo-environmental distribution within the formation parallels the distribution of these elements through Proterozoic time. In the Society Cliffs Formation, restricted carbonates--including microdigitate stromatolites, laminated tufa, and tufted microbial mats--consist predominantly of synsedimentary cements; these facies and the cyanobacterial fossils they contain are common in Paleoproterozoic successions but rare in Neoproterozoic and younger rocks. Less restricted tidal-flat facies in the formation are composed of laminated microbialites dominated by micritic carbonate lithified early, yet demonstrably after compaction; these strata contain cyanobacteria that are characteristic in Neoproterozoic rocks. Within the formation, the facies-dependent distribution of microbial populations reflects both the style and timing of carbonate deposition because of the strong substrate specificity of benthic cyanobacteria. A reasonable conclusion is that secular changes in microbenthic assemblages through Proterozoic time reflect a decrease in the overall representation of rapidly lithified carbonate substrates in younger peritidal environments, as well as concomitant changes in the taphonomic window of silicification through which early life is observed.     

GPS高程测量中大地水准面差距的计算

本文介绍了研究大地水准面的三种主要方法，及利用ＧＰＳ高程测量成果结合地表拟合技术求正高高程应用的情况。