细基江蓠密集型采孢子培育幼苗试验

作者进行了自然海区潮间带密集型的细基江蓠采孢子培育幼苗的试验。1988年和1989年在每平方米的苗圃上随机取样,各得1.77公斤和6.25公斤长10厘米以上的江蓠幼苗,可以满足在20倍的浅海面积进行浮筏式夹苗栽培之用。相当于农业上播种育秧、种植水稻的两倍效果,解决了群众在自然海区潮间带培育细基江篱幼苗的问题。     

敦煌壁画计算机存贮与管理信息系统中的图像处理

准确无误的获取和再现洞窟内壁画和佛龛的数字图像是建立敦煌壁画计算机存贮与管理信息系统的关键技术之一。本文讨论了利用计算机技术和摄影测量技术获取壁画的数字图像,并依据近景摄影测量原理和色度学原理对数字图像进行几何纠正和色彩失真矫正的方法,结果表明通过数字图像处理可以达到较高的几何纠正精度和色彩还原效果,为壁画计算机存贮与管理打下基础     

Fractal and chaotic phenomena of seismic dissipated energy in an energy system of engineering structures

Fractal and chaotic phenomena in engineering structure are discussed in this paper, it means that the characters of fractal and chaos on dynamic system of seismic dissipated energy activity intensity E _d and activity intensity of seismic dissipated energy moment I _e are analyzed carefully. Based on the conceptions of the energy system of engineering structures Θ, seismic dissipated energy activity intensity E _d and activity intensity of seismic dissipated energy moment I _e, the chaotic phenomena of dynamic systems E _d and I _e are discovered by theoretic derivation, then the fractal characters of them are also discovered from theoretical inferring and numerical computation. Attractor of relative dimension d ₂, Renyi entropy of the second order k ₂, mean predictable time scale 1/k ₂ and other parameters of the dynamic system which were constructed in light of a large number of actual measuring seismic data have been achieved in the end. These parameters are exactly what the fractal and chaotic phenomena have represented in practical dynamic system, which may be valuable for earthquake-resistant theory and analytical method in practical engineering structures.     

Grey characteristics of microbanding of stalagmite in Shihua Cave, Beijing and its climatic signification(I)

Grey microstructure of microbanding in thin sections of stalagmite T9501 from Shihua Cave, Beijing was studied. The types of grey and the morphologic features of organic material were classified. The signification of microbanding and annual layer was discussed. The standard distinguishing the false annual layer and the multi-year layer is set up, which provides the theoretic fundaments for paleoclimatic study. Project supported by the National Natural Science Foundation of China (Grant No. 49672134).     

直至核幔边界的Mg2SiO4成分熔体剪切粘滞度的平衡分子动力学研究

熔体的粘滞度极大地影响熔体的各处动力学行为。虽然有一些有关酸碱生熔体粘滞度的数据但涉及地球更深部过程的基性和超基性熔体的粘滞度的数据很少。本项研究利用平衡分子动力学方法Ｍｇ２ＳｉＯ４成分熔体从２１６９Ｋ到５５９５Ｋ。压力从１０＾５Ｐａ到１３５ＧＰａ的粘滞度,所获得的粘滞度数据介于Ｕｒｂａｉｎｅｔ ａｌ,（１９８２）和Ｉｖａｎｏｖ ａｎｄ Ｓｔｅｎｇｅｌｍｅｙｅｒ（１９８２）的实验数据之间,比Ｓｈａ     

岩质边坡不连续面预测方法

利用计算机技术再现了岩质边坡上不连续面的空间形态,提出了利用三维网络原理预测岩质边坡不连续面空间展布的方法,并用Ｃ语言在微机上实现。     

内蒙呼包盆地晚更新世孢粉组合及其意义

本文是对内蒙呼包盆地内二级台地沉积物进行孢粉分析的总结。根据对孢粉资料的分析研究得出,该区二级台地沉积物堆积时期的古植被是由森林草原过渡到荒漠草原,气候由湿凉转向干冷。通过孢粉组合的对比,证明二级台地形成于晚更新世晚期,相当于萨拉乌苏组的地层时代     

Distribution of polychlorinated biphenyls in the water, sediment and fish from the Pearl River estuary, China

The concentrations and distribution of polychlorinated biphenyls were determined in water, surface sediments and fishes from the estuaries of Pearl River, PR China. The results showed that the concentrations ranged from 2.47 ng l-1 to 6.75 ng l-1 in water, from 11.13 ng g-1 to 23.23 ng g-1 in sediments (dry weight) and from 68.64 ng g-1 to 316.85 ng-1 in fish (lipid weight). It was found that the feeding habits of fish were very significant in the accumulation of polychlorinated biphenyls and pattern of congeners. Carnivorous and benthic fishes such as eel (Anguilla japonica) and Chinese sea catfish (Arius sinensis) were found to have high concentrations of polychlorinated biphenyls and of high-chlorinated congeners, while herbivores such as shad (Clupanodon punctatus) and mullet (Mugil cephalus) exhibited an opposite trend. Congeners IUPAC Nos. 153, 138, 118, 87/81, 170 and 52 were found frequently in most samples (both sediment and fish). In comparison with other places in the world, the concentration of polychlorinated biphenyls in sediment and fish from the estuary of Pearl River were low.     

我国几种热带海藻的光合作用与光量子通量密度的关系

本文介绍用氧电极法测定海南岛潮下带产的凤尾菜Gracilaria eucheumoides等6种热带红藻和无肋马尾藻Sargassum enerve等3种热带褐藻的光合活性和光量子通量密度的关系。研究结果表明:1.红藻和褐藻的补偿点差别不大,9种热带海藻的光合作用补偿点都在24—28μE/(m~2·s)之间,而光合作用饱和点上的净光合作用速率为0.18—0.66mgO_2/(g鲜重·h),一般而言,红藻的较低,褐藻的较高;2.各种热带海藻的光合作用饱和点的差异,其规律也符合一般海藻的垂直分布规律;3.对人工栽培的凤尾菜、琼枝Eucheuma gelatinae卡帕藻Kappaphycus alvarezii等,可以扩大生长水层,在更深一些的水层中栽培,这对发展生产是非常有利的。