共反射面元叠加技术在南海北部莺—琼盆地中的应用

随着莺—琼盆地油气勘探开发的不断深入,2 700 m以下的中深层地震资料品质迫切需要提高,而改善信噪比提高成像质量则是需要深入研究的重点内容之一。基于共反射面元(CRS)叠加在改善中深层地震资料信噪比方面具有理论和技术应用优势,由于考虑了反射层的局部特征和第一菲涅耳带内的全部反射,对复杂地质问题的适应性得以增强,真正实现了高信噪比叠加,从而改善中深层低信噪比区的成像质量。通过理论研究分析、模型试处理及莺—琼盆地实际地震资料处理中具体的应用与试验,取得了明显的效果,即该区中深层地震资料信噪比显著增强,大大提高了解释的可靠程度。总之,共反射面元叠加技术在莺—琼盆地具有较高的推广应用价值。     

长牡蛎四倍体诱导的研究

本文采用长牡蛎三倍体卵子与二倍体精子授精,用0.5mg/dm3CB处理受精卵抑制第一极体排放诱导出四倍体.处理组在担轮幼虫期检测染色体,4个处理组的四倍体分别为13.95%、12.19%、0%和40.00%.处理组3染色体数在24、25条.其中处理组1、3、4获得稚贝(1～3mm),存活率分别为0.49×10-5、212×10-5和23×10-5.处理组1获得稚贝108粒,处理组3获得附着稚贝7万粒,处理组4获得附着稚贝7000粒.文中还就三倍体雌贝怀卵量及四倍体诱导机制进行了讨论.     

“916”低聚糖抗卵磷脂氧化活性的研究

作者采用自由基引发氧化模型。通过测定卵磷脂氢过氧化物 ( PCOOH) ,研究了“916”低聚糖对卵磷脂 ( PC)氧化的抑制作用。实验结果表明 :( 1)“916”低聚糖具有良好的抗氧化活性 ;( 2 )各低聚糖在质量相同和含硫量大致相同的条件下 ,总体上分子量越小抗氧化活性越高。     

冲绳海槽北段的重磁场特征及地质意义

１９９２年之前,国内对冲绳海槽的调查研究主要集中在海槽的中部和南部,而对其北段的调查研究工作却很少。根据实测的重磁异常,较深入地分析了海槽北段的地球物理场特征,构造活动地壳结构及应力状态,结果表明冲绳海槽北段同样具有强烈的地壳构造活动。     

Study on the high precision acoustic measurement techniques for determining temperature field around seafloor hydrothermal vent

This paper presents the basis of acoustic method used for temperature field measurement of seafloor hydrothermal vent and two techniques of the parabolic interpolation and the bending compensation of propagation paths of acoustic signal are introduced. Experimental research is performed to exactly rebuild the temperature field around hot springs on the floor of Qiezishan Lake, Yunnan, China. The accuracy of the travel time estimation has been improved based on the aforementioned technique and method. At the same time, by comparison of the results of temperature field with different means, the max absolute error, the maximum relative error and the root mean square error are given. It shows that the technique and the method presented in the paper can be applied to the temperature field measurement detector around the seafloor hydrothermal vent. It also has a good accuracy.     

链状裸甲藻赤潮消亡过程及其与休眠包囊关系的初步研究

本文对2018年6月10−14日在泉州湾海域发生的一次链状裸甲藻（Gymnodinium catenatum）赤潮的消亡过程进行研究。在现场跟踪监测,共设置4个站位,进行6个航次海洋环境及浮游植物的调查。结合本文对泉州湾海域甲藻包囊的调查研究,探索休眠包囊与赤潮生消过程的关系。研究结果显示,赤潮发生时海况良好,水温和盐度分别介于27.1～28.2℃和29.7～31.4之间,活性磷酸盐和无机氮浓度分别介于未检出至0.045 4 mg/L和0.050～0.281 mg/L之间,赤潮生物密度与营养盐浓度没有呈现显著的相关关系,大风大浪是导致赤潮消亡的重要原因;赤潮消亡过程中共鉴定出浮游植物3门48属100种,硅藻门种类最多;赤潮消亡期间浮游植物群落结构发生变化,前期链状裸甲藻占绝对优势,最高密度达（7.02±0.11）×10⁶ cells/L,后期中肋骨条藻（Skeletonema costatum）和旋链角毛藻（Chaetoceros curvisetus）代替链状裸甲藻成为优势种,且浮游植物种类数明显增加;同时在泉州湾海域共鉴定甲藻包囊5大类37种和1种未定种,平均丰度为574 cysts/g,以异养型甲藻包囊为主;休眠包囊在赤潮生消过程中起着重要作用,赤潮消亡时形成休眠包囊,包囊数量会随着时间呈下降趋势,但仍有萌发的可能,具有重新暴发赤潮的潜在性,需要引起重视。     

The ground-state entanglement in the spin-XX chain with a magnetization current

The ground-state entanglement in a transverse spin-1/2 XX chain with a magnetization current is studied. By introducing a magnetization current to the system, a quantum phase transition to current-carrying phase may be presented with the variation of the driving field λ for the magnetic field h>1; and the ground-state entanglement arises simultaneously at the critical point of quantum phase transition. In our model, the introduction of magnetization current may result in more entanglement between any two nearest-neighbour spins.     

基于分析法经典溢油蒸发模型的改进

针对经典的分析法溢油蒸发模型,对溢油初始沸点温度T0参数和蒸馏曲线梯度TG参数进行了修正,建立了考虑溢油粘度、蜡含量、沥青质等属性的修正公式;基于渤海冀东32-6和绥中36-12种油样,对无风速情况下传质系数K2的修正常数R给出了估计范围。初步检验结果表明,改进模型数值结果更接近实验值。     

Bathymetry enhancement by altimetry-derived gravity anomalies in the East Sea (Sea of Japan)

The gravity-geologic method (GGM) was used to enhance the bathymetry of the East Sea (Sea of Japan) with satellite altimetry-derived free-air gravity anomalies and shipborne depth measurements. By comparison with the bathymetry model of Smith and Sandwell’s (SAS) approach (1994), GGM was found to have an advantage with short wavelength (≤12 km) components, while SAS better predicts longer wavelength (≥25 km) components, despite its dependency on density contrast. To mitigate this limitation, a tuning density contrast of 10.25 g/cm³ between seawater and the seafloor was primarily estimated by the downward continuation method and then validated by the check points method with GGM. Similarly, SAS is limited by the “A” value in low-pass part of the Wiener filter, which defines the effective range of the wavelength components on bathymetry. As a final result, we present an enhanced GGM bathymetry model by integrating all available data.     

Warming and depth convergence of the Arctic Intermediate Water in the Canada Basin during 1985-2006

The warming of the Arctic Intermediate Water (AIW) is studied based on the analyses of hydrographic observations in the Canada Basin of the Arctic Ocean during 1985-2006. It is shown that how the anomalously warm AIW spreads in the Canada Basin during the observation time through the analysis of the AIW temperature spatial distribution in different periods. The results indicate that by 2006, the entire Canada Basin has almost been covered by the warming AIW. In order to study interannual variability of the AIW in the Canada Basin, the Canada Basin is divided into five regions according to the bottom topography. From the interannual variation of AIW temperature in each region, it is shown that a cooling period follows after the warming event in upstream regions. At the Chukchi Abyssal Plain and Chukchi Plateau, upstream of the Arctic Circumpolar Boundary Current (ACBC) in the Canada Basin, the AIW temperature reached maximum and then started to fall respectively in 2000 and 2002. However, the AIW in the Canada Abyssal Plain and Beaufort Sea continues to warm monotonically until the year 2006. Furthermore, it is revealed that there is convergence of the AIW depth in the five different regions of the Canada Basin when the AIW warming occurs during observation time. The difference of AIW depth between the five regions of the Canada Basin is getting smaller and smaller, all approaching 410 m in recent years. The results show that depth convergence is related to the variation of AIW potential density in the Canada Basin.