河口Si输运过程研究

基于拉格朗日余流及其输运过程的一种三维空间弱非线性理论，进一步假定Ｓｉ在河口的无因次化学转移项量级为ｋ＾２，给出了Ｓｉ的长期输运方程。对于一种二维模型河口，数值求解了零阶天文潮，欧拉余流、斯托克斯漂移、拉格朗日余流和盐度的分布；分别计算了平均逼留时间为１３，３０，６０，１８０ｄ等所对应的Ｓｉ浓度分布；给出了Ｓｉ－ｓ相关图，讨论了河口中Ｓｉ的保守性问题。     

Analysis of Mixing of Pollutants in Water Waves and Currents

A vertical two-dimensional turbulence numerical model for the interaction of waves and currents is developed in the paper based on the nonlinear two-equation k-ε model with the VOF method.The one-dimensional equivalent advection velocity and equivalent mixing coefficient are defined and the solving process is introduced:The pollutant concentration field,generated by an instant source in waves and currents,is calculated with the model,and then the equivalent advection velocity and equivalent mixing coefficient are obtained by calculating the time derivative of the mean and variance of pollutant concentration probability distribution.The effects of wave period and wave height on the equivalent mixing coefficient for waves and wave-currents are also investigated.     

以顾客为关注焦点,创中心品牌服务

IS09000标准八项质量管理原则的内容是：以顾客为关注焦点；领导作用，全员参与；过程方法；管理的系统方法；持续改进；基于事实的决策方法，与供方互利的关系。其中“以顾客为关注焦点”放在了质量管理八大原则的首位，并且贯穿于标准的始终。标准对这一原则所作的描述是“组织依存于顾客，因此组织应理解顾客当前和未来的需求，满足顾客要求并争取超越顾客期望”。     

光合细菌在对虾育苗生产中的应用

１９９５年４月２４日～５月８日，在文登高岛盐场育苗场５０ｍ３水体育苗池，进行了用几株光合细菌（ＲｈｏｄｏｐｓｅｕｄｏｍｏｎａｓＳ．Ｐ．）混合菌液作为中国对虾（Ｐｅｎａｅｕｓｃｈｉｎｅｎｓｉｓ）苗期水质净化剂及辅助饵料，取得了明显效果。育苗池水透明度提高约２０ｃｍ，幼体挂脏率下降５０％，变态提早１ｄ左右，且多产仔虾百万尾     

Molecular identification of bloom-forming species Phaeocystis globosa (Pryninesiophyta) and its dispersal based on rDNA ITS sequence analysis

The colony-forming Phaeocystis species are causative agents of dense bloom occurrences in coastal waters worldwide. It is difficult to separate them because of the different morphologies associated with their colonial stages. In this study we applied molecular approaches to analyze the genetic variation of Phaeocystis globosa and Phaeocystis pouchetii from several geographic regions, and to assist in tracing the dispersal of bloom-forming Phaeocystis species in coastal waters of China. The sequences of the internal transcribed spacers (ITS1 and ITS2) of rDNA and the 5.8S ribosomal RNA gene of Phaeocystis strains were determined. Sequence comparison shows that P.globosa was the most divergent to P. pouchetii, exhibiting sequence divergence higher than 0.08. However, lower genetic divergences existed between strains of P.globosa. The sequence comparison of the Phaeocystis rDNA ITS clearly shows that the species isolated from the southeast coast of China is identified as P.globosa rather than P. cf. pouchetii or other species. Furthermore, the significance of rDNA variation in distinct global populations of P.globosa suggested it might have had sufficient time to accumulate detectable mutations at the rDNA locus, supporting the hypothesis of ancient dispersal of P.globosa to many areas, meaning that P.globosa blooms in the coastal waters of China are endemic rather than a newly introduced species or a foreign source. Finally, based on the high divergent region of rDNA ITS, a pair of species-specific primers for P.globosa were designed, they could be useful to detect the presence of this species in mixed plankton assemblages or flagellate stages that are recognized with diffculties by means of conventional microscopy.     

对称式布置锚链系统的线性化处理

用悬链线方程求解了不同锚链状态的锚链力 ,并用多项式回归了锚链力与锚固点位移的关系 ,由此求得锚链恢复力刚度系数。分析了对称式布置锚链系统的非线性程度 ,阐述对称式布置锚链系统所提供的恢复力作线性化处理的可行性及方法 ,并给出了对称布置锚链系统的线性刚度矩阵。为各类受对称式布置锚链系统约束的浮动结构物的动力分析提供了理论依据     

酶解条件对条斑紫菜单细胞成活率影响的比较研究

该文分别选用不同浓度的海螺酶 ;葡萄糖、蔗糖、甘露醇、山梨醇、氯化钠 5种渗透剂 ;维生素 C和甘露醇 2种抗氧化剂 ;对条斑紫菜酶解单细胞的成活率进行了研究。实验结果表明 :用浓度为 10 %的海螺酶酶解条斑紫菜 ,成活率最高 ;选用 2 mol/ L葡萄糖作渗透剂 ,效果最好 ,成活率达85.2 % ;加入抗氧化剂对细胞成活率没有影响     

褐牙鲆(♀)、夏鲆(♂)及其杂交子一代线粒体16S rDNA序列遗传特性的初步研究

以线粒体16S rRNA基因部分片段为代表研究雌褐牙鲆Paralichthys olivaceus、雄夏鲆P. dentatus及其杂交子一代间线粒体DNA的遗传特性。母本与父本序列差异较大,属种间差异,在590个位点中有28个变异位点,而且全部为简约信息位点。使用同一对引物扩增亲本与杂交子代,在杂交子代中未检测到父本的线粒体DNA类型,11个处于两种生长阶段的杂交样本仅检测到一种单倍型,而且与母本的一个单倍型为同一种,表明褐牙鲆与夏鲆杂交线粒体DNA遵循母系遗传规律。     

EDM高程导线测量中的效率和精度问题探讨

随着全站仪测角测距精度的提高,在高程联测中,用EDM高程导线测量代替三四等水准测量,成为外业高程测量的重要方法之一。分析了影响EDM高程导线测量精度的因素,讨论了提高EDM高程导线测量精度的办法,提出了效率函数的概念,并以某测区三级GPS大地控制网高程联测数据为例,从精度和效率方面进行了计算对比分析。     

现代黄河三角洲地面沉降及其原因分析

为全面和具体地了解整个黄河三角洲的地面沉降状况,收集了现代黄河三角洲地区1956、1967、1980年1∶5万比例尺的地形图资料,利用地理信息系统软件进行数字化、建立高程数据库,生成数字高程模型。通过对不同时期数字高程进行空间运算发现,1956—1980年间黄河三角洲地区地面沉降现象普遍,沉降区年平均沉降数厘米。基于数字高程空间分析结果,探讨了诱发三角洲地面沉降的自然和人为因素。