海南万宁礼纪青梅林（续完）

海南万宁礼纪青梅林（续完）梁淑群，林英，杨小波，黄世满，符史新，谢国干（海南大学）礼纪青皮林自然保护区植物名录面类植物门ＰＴＥＲＩＤＯＰＨＹＴＡ１松叶蕨科Ｐｓｉｌｏｔａｃｅａｅ１）松叶蕨Ｐｓｉｌｏｔｕｍｎｕｄｕｍ（Ｌｉｎｎ，）Ｇｒｉｓｅｂ２水龙骨科Ｐ...     

双原子分子的规范不变跃迁几率幅

本文将非相对论量子力学的规范不变表述在电偶极近似下用于电磁场中的双原子分子,导出了求规范不变跃迁几率幅的一般方程,由此方程在一些特殊情形下算出了HF分子的数值结果。     

用静息细胞培养法研究L－谷氨酸氧化酶的生物合成

建立了静息细胞培养系统，并以此研究了Ｌ－谷氨酸氧化酶生物合成的影响因素。结果表明，发酵１６ｈ的菌体在有诱导物情况下有酶的合成，无诱导物则无酶的合成，发酵４０ｈ的菌体在有、无诱导物的条件下均有酶的合成。对发酵１６ｈ的菌体研究表明：β－丙氨酸（Ⅰ）、α－酮戊二酸（Ⅱ）、丙酮酸钠（Ⅲ）是酶合成的诱导物，谷氨酸（Ⅳ）则不是。而对发酵４０ｈ菌体而言：ＭｇＣｌ＿２，ＣａＣｌ＿２能促进酶的合成；Ⅰ不能作氮源利用；Ⅰ～Ⅳ均具有高浓度抑制产酶、低浓度促进产酶的双重作用。     

2：2型过氧钨酸盐的制备,结构和性质研究

在H_2O_2溶液中.通过活性粉状白钨酸的解聚制备了二个O_2~(2-):W为2:2型的新的过氧钨酸盐:K_2W_2O_s(O_2)_2·4H_2O(1)和(E_(t4)N~-)_2W_2O_5(O_2)_2·2H_2O(2).用IR、UV和XRD对二个过氧化物进行了表征,并推断了过氧钨酸阴离子的可能结构.     

氢化物—原子荧光法测定人血清中的硒

本文研究了用湿法消化样品，氢化物—原子荧光法测定人血清中硒含量最佳条件。线性范围０—４０．０ｎｇ／ｍＬ．检测限为１．０ｎｇ／ｍＬ相对标准偏差为３．５％，平均回收率为９８．２％。用该法对合肥地区２４１例正常人的血清硒水平做了检测评估。     

上海城市在热岛和海风锋影响下特大暴雨的初步分析

上海地处长江三角洲冲积平原,由于沿江滨海,水网交错,在特定的环流形势背景下,可在市区形成集中降水。本文针对1985年8月31日(以下简称8.31)发生于上海的一次特大暴雨,在对环流形势分析的基础上,进行气流升速等7个物理量的计算,研究了下垫面对局地强雷暴活动的动力、热力和地形作用。结果表明:南下的冷空气与太平洋副热带高压西缘暖湿气流的辐合是造成这次雷暴雨的发生源,而在副高短期稳定,西风槽少动的条件下,海风锋和城市热岛可对最大降水落区起到触发机制或“诱导”、增幅作用。     

海底悬空管道弹性约束静态分析

由于海浪的冲刷,海底管道会出现悬空段,当悬空段较长时,管道在波浪及海流的作用下将会发生破坏。对海底悬空管道所受的环境载荷进行了计算,把海底土壤对管道的约束视为弹性约束,推导出了弹性约束时的系数矩阵,建立了相应的有限元分析模型,并开发了相应的计算机软件。该软件不仅可以计算立管与水平管连接处悬空管段的强度,还能计算静强度下的临界悬空长度。将弹性约束与刚性约束时的计算结果进行了对比,结果表明,当海底地层较硬时,弹性约束与固定端约束的计算值相差不大;当地层较软时,弹性约束时管道中的最大应力比固定端约束的要大,而临界悬空长度相差不多。     

It型随机线性Markov切换系统的可控性

研究了一类由Markov跳参数模态切换的It 型随机线性系统的可控性。运用鞅不等式技术,得到了It 型随机切换线性系统随机可控的几个充分性判据,并且这些判据等价于一组相伴的Bernoulli方程的可解。最后给出一个例子来说明判别条件的有效性。     

Linear sand ridges on the outer shelf of the East China Sea

Based on the latest full-coverage high-resolution multi-beam sounding data, the distribution of the linear sand ridges on the outer shelf of the East China Sea （ECS） is studied with quantitative statistical analysis. The study area can be divided into the northeastern part and the southwestern part. Sand ridges in the northeastern area, trending 116°N, show obvious linear character and shrink to the inner shell Sand ridges in the southwestern area, trending 120°N -146°N, tend to have net form. Sand ridges gradually become sand sheets in the center part of study area. Sand ridges are distributed landward to the isobath of 60m, distributed seaward to the water depth of 120 m in the northeast and 150 m in the southwest. Immature sand ridges are observed at water depth of 130-180 m in the southwestern depressions. The acoustic reflection properties of the internal high.angle inclined beddings of the sand ridges are analyzed based on the typical seismic profiles close to the research area. Lithological analysis and dating of 4 boreholes and 12 cores indicate that the widely distributed transgressive sand layer with high content of shell debris which was formed in the early-middle Holocene is the main composition of the linear sand ridges on the outer shelf of the ECS. The dominating factor in formation, developing and burying of the sand ridges is the variation of water depth caused by sealevel change and the rate of sediment supply. In 12400 aBP the cotidal lines of the M2 tidal component were closely perpendicular to the strike-directions of the sand ridges in the study area, and the tidal wave system during 12000-8000 aBP might play a key role in the formation of the linear sand ridges which are widely distributed on the outer shelf of the ECS.