锦州9-3油田海域环境现状及其评价

1 引言 石油,作为现代社会的主要能源,在全球经济迅速发展和人口激增的情况下,世界范围内的供求在不断增长,海洋石油勘探开发规模也在不断扩大.海洋油气开发已成为我国油气战略资源的主要来源之一.     

Three-dimensional numerical simulation of wind-induced barotropic circulation in the Gulf of Patras

The barotropic, wind-induced circulation, which develops in the Gulf of Patras in Western Greece during the winter, is studied using three-dimensional numerical simulations. The simulations are performed using the numerical code MIKE 3 FM (HD). The Gulf's basin is bracketed between two sills, one on the west at the opening with the Ionian Sea and the other on the east at the Straits of Rio-Antirio at the opening with the Gulf of Corinth. The simulations show that the wind-induced flow creates strong currents near the coasts, which determine the sense of rotation of the gyres that develop in the Gulf. Strong currents are also created at the Rio-Antirio Straits. The wind-induced, barotropic currents do not seem to contribute to the direct replenishment of bottom waters, which recirculate between the two sills. Depending on the wind-speed forcing of the flow, the residence time of the waters in the Gulf of Patras is estimated to range from one week to one month.     

厚壳贻贝(Mytilus coruscus)足丝蛋白mcofp3和mcofp6的cDNA克隆及序列分析

通过设计特异性引物,采用PCR扩增的方法对厚壳贻贝足腺细胞cDNA文库进行筛选,共克隆得到14条厚壳贻贝mcofp3的cDNA序列和8条mcofp6的cDNA序列,并对其基因序列及推导的氨基酸序列进行了序列比对和变异位点初步分析。结果表明,14条mcofp3cDNA序列分属于厚壳贻贝mcofp3家族的两个亚家族,其成熟肽序列变异相对活跃;而8条mcofp6 cDNA序列并无明显的亚家族划分,序列相对保守。本次实验所获得的mcofp cDNA序列初步显示了厚壳贻贝足丝蛋白家族基因的分子多样性,为将来深入了解厚壳贻贝足丝蛋白的分子多样性机制以及在此基础上开发相关的新型生物黏附剂奠定了基础。     

Sr掺杂Eu1-xSrxMnO3体系的磁相变以及输运特性研究

对Eu_1-xSr_xMnO₃ (ESMO, x=0—1)体系的结构和磁性进行了系统的研究,结果表明Sr的掺入使EuMnO₃反铁磁母体的磁结构发生巨大的变化.通过磁化和电输运测量,深入探讨了高掺杂浓度Eu_0.4Sr_0.6MnO₃和Eu_0.3Sr_0.7MnO_{3相似文献}   

Cu3 N弹性和热力学性质的第一性原理研究

利用基于密度泛函理论的第一性原理全势线性缀加平面波方法,研究了立方反ReO₃结构Cu₃N在零温(0 K)零压下的平衡晶格常数、体弹模量及其对压强的一阶导数,计算结果与其他实验及理论结果基本相符. 同时得出Cu₃N的弹性常数,Poisson比等,并分析出Cu₃N在零温零压下是稳定的. 通过准谐Debye模型计算Cu₃N的热力学性质,得到了Cu₃N的晶格常数、等压比热容、等容比热     

Improvement of photorefractive properties in Hf:Fe:LiNbO3 crystals with various [Li]/[Nb] ratios

Photorefractive properties of Hf:Fe:LiNbO₃ crystals with various [Li]/[Nb] ratios have been investigated at 488 nm wavelength based on the two-wave coupling experiment. High diffraction efficiency and large recording sensitivity are observed and explained. The decrease in Li vacancies is suggested to be the main contributor to the increase in the photoconductivity and subsequently to the induction of the improvement of recording sensitivity. The saturation diffraction efficiency is measured up to 80.2%, and simultaneously the recording sensitivity of 0.91 cm/J is achieved to in the Hf:Fe:LiNbO₃ crystal grown from the melt with the [Li]/[Nb] ratio of 1.20, which is significantly enhanced as compared with those of the Hf:Fe:LiNbO₃ crystal with the [Li]/[Nb] ratio of 0.94 in melt under the same experimental conditions. Experimental results definitely show that increasing the [Li]/[Nb] ratio in crystal is an effective method for Hf:Fe:LiNbO₃ crystal to improve its photorefractive properties.     

甘草和连翘对牙鲆CYP3A 活性影响的研究

研究甘草(Glycyrrhiza uralensis)和连翘(Forsythia suspensa)对牙鲆(Paralichthys olivaceus)肝细胞色素P4503A(CYP3A)活性的影响。将牙鲆随机分为3组,即对照组、甘草组和连翘组,对照组每日口灌0.9%的生理盐水,试验组每日1次口灌甘草30 mg/kg和连翘100 mg/kg,连续口灌6 d,第7天时,采用直接测定法和间接测定法(探针药物)进行CYP3A酶活性的测定。结果显示:在肝微粒体水平上,甘草和连翘均可明显提高红霉素-N-脱甲基酶活性,分别提高了1.79倍、4.87倍。与对照组相比,甘草组和连翘组氨苯砜的半衰期分别降低了4.51%(P0.05)和36.8%(P0.01);药时曲线下面积分别减小了8.28%(P0.05)和32.3%(P0.01);总清除率分别增加了5.63%(P0.05)和99.3%(P0.01)。说明连翘对牙鲆CYP3A的活性具有极显著诱导作用,甘草诱导作用不显著。提示其他药物与连翘合用时,其有效性和安全性可能会受到影响。     

NaHSO3对盐生杜氏藻生长和光合色素含量的影响

为优化盐生杜氏藻营养盐配方、降低养殖成本、提高生物量及色素积累, 研究了不同浓度的安全环保的植物循环光合磷酸化促进剂--NaHSO3(≤0.40mM·L-1)溶液对盐生杜氏藻生长和光合色素含量的影响.结果表明, NaHSO3可显著促进盐生杜氏藻生长, 提高叶绿素a (Chl a)和b(Ch1 b)含量、叶绿素总量(Chl)、类胡萝卜素含量(Car)和Chl/Car;促进效应随浓度增加表现为先升后降, 低浓度(<0.10mM·L-1)效应较好, 以0.07mM·L-1为最佳.NaHSO3提高Chl b的效应大于Chl a, 降低Chl a/Chl b比值, 随浓度增加表现为先降后升, 以0.07mM·L-1降低最大.本试验条件下, 盐生杜氏藻生物量与光合色素含量间及各光合色素含量间呈显著或极显著相关, 与生物量(Y, g·L-1)相关最大的是Chl b (XChl b, μg·ml-1), 符合Y=0.284XChl b-0.883 (R2=0.994**)(**表示Y与X之间在0.01水平上极显著相关,下同);其次为Chl (XChl, μg·ml-1), Y=0.100XChl-2.022 (R2=0.993**), 为生长动态的及时掌握提供了有效的间接衡量指标.     

基于多旋翼无人机倾斜摄影测量的沙丘三维形态研究

无人机倾斜摄影技术是近年来发展起来的新型测量方法,具有高效率、高精度、非接触、大范围等优点。本研究采用多旋翼无人机,结合精确测定的地面控制点,实现了对新月形沙丘群三维形态的精确测量。结果表明：无人机倾斜摄影测量的均方根误差小于18 mm,可以满足大比例尺地形测量的要求。利用该技术获取的多种测量参数表明,新月形沙丘二维与三维形态之间存在良好的相关性,基于这些关系,可以实现二维遥感影像量测结果向沙丘高度、沙丘体积等三维参数的转换。沙丘剖面形态可以采用非线性函数精确描述,为沙丘形态精确建模提供了参考。无人机倾斜摄影技术获取的沙丘三维形态参数,对于深入认识沙丘形态动力过程具有重要参考价值。     

基于加权约束的单体建筑物点云表面重建算法

建筑物点云表面重建在高精度城市测绘、虚拟现实等领域有十分广泛的应用前景。由于建筑物的几何形态多变,重建算法普遍存在计算速率慢、拟合精度低和模型结构不完整的问题。为此,本文以单体建筑物为研究对象,提出基于加权约束的单体建筑物点云表面重建算法,在表面初始化过程中充分考虑数据对结构拟合的贡献。在此基础上,构建基于正则集的单体建筑物表面重建算法,实现建筑物拟合过程中的加权拟合误差、近邻结构平滑的同步优化。针对多类建筑物三维点云的实验结果表明,相比传统的建筑物重建策略,本文的加权约束方法可根据不同类型的点云数据设计自适应权重,并选择模型拟合中最优的权重函数,在高噪声、低精度点云数据下能得到更高精度的单体建筑物表面模型。