海州湾近岸张网渔获物种类组成和资源利用现状分析

根据2011年3月~2012年12月海州湾沿岸定置张网调查资料,对海州湾张网渔获物组成进行比较分析。结果表明,张网渔获物组成具有明显的季节变化特征,春季以尖海龙(Syngnathus acus)、六丝钝尾虾虎鱼(Amblychaeturichthys hexanema)、双斑蟳(Charybdis bimaculata)、长蛸(Octopus variabilis)、方氏云鳚(Enedrias fangi)和口虾蛄(Oratosquilla oratoria)为主,秋季主要为小黄鱼(Larimichthys polyactis)、六丝钝尾虾虎鱼、三疣梭子蟹(Portunus trituberculatus)、日本枪乌贼(Loligo japonica)、鹰爪虾(Trachypenaeus curvirostris),冬季主要为六丝钝尾虾虎鱼、口虾蛄、鲜明鼓虾(Alpheus heterocarpus)、细鳌虾(Leptochela gracilis)和日本鼓虾(Alpheus Japonicus)。主要经济鱼类小黄鱼在9、10月产量最高,但达到可捕体长的小黄鱼不足1%,主要经济虾类鹰爪虾在9、10月产量最高,取样中69.46%的鹰爪虾达到可捕体长。渔捞日志记录表明,9月份单船平均网产达到最大值(17.01kg/net),12月份单船平均网产最低(2.87kg/net)。建议对张网渔业加强管理,开展生态型渔具渔法的研究,放大网目尺寸,加强对近海资源的养护。     

黄河口清水沟流路地貌特征研究

黄河入海流路自1976年5月改道至清水沟流路以来,其地貌形态一直处于剧烈的变化当中,以往的研究虽然关注了典型断面主槽的形态特征及过流能力的变化,但对于清水沟流路范围界限内河道断面整体形态及其沿程变化等地貌特征还缺乏系统研究.本文以2019年10月黄河口现行清水沟流路范围渔洼以下河段加测横断面为研究对象,辨识现状地貌分布...     

The Global Distribution of Diapycnal Mixing and Mixing Coefficient Tensor in the Upper 2000m Ocean from Argo Observations

Diapycnal Mixing (DM) within the upper 2000m of the global ocean is calculated by a fine-scale parameterization using the multiyear-mean density gridded product that created by employing all the Argo float observations to date through the recently published equation of seawater TEOS-10. The geographic distribution of Argo-derived DM derived in this study is spatial-dependent and varies with latitude and depth. The magnitude and pattern of DM is favorably validated by comparisons with previous studies. Furthermore, the mixing coefficient tensor K is calculated and analyzed. Components of the tensor fitting for the geopotential coordinate models are also presented. It is found that the tensor components in horizontal direction, K_xx and K_yy, have similar magnitude and distribution pattern. In the vertical, K_zz is enhanced over regions with rough topography and strong wind (e.g., Westerly region), suggesting agreement with previous estimates. This work presents a scheme to estimate the DM and mixing coefficient tensor using Argo observations, and offers a useful Argo-based mixing product for the purpose of promoting the study and modeling of ocean circulation and other processes.     

利用卫星遥感资料估算海面太阳辐照度的初步结果

本文在分析了若干由卫星信息提取地表的太阳辐照度物理模式的基础上,将１９９５年５月２６日的ＮＯＡＡ卫星ＡＶＨＲＲ资料经适当变换后,选用Ｈａｙ和Ｈａｎｓｏｎ模式估算并分析了黄渤海３５°～４０°Ｎ、１２０°～１２５°Ｅ海区的海面太阳辐照度值。文中指出,卫星测量可成为海面太阳辐照度观测的有效手段。建议：１）尽快在国内开展这方面的研究;２）应进行海洋实况测量（最好是卫星过境时同步进行）;３）建立从卫星资料提取我国海区海面辐照度的适用算法。     

成山头海域潮流能资源可开发量评估

针对潮流能资源较丰富的成山头外海域,利用FVCOM数值模式,在良好模拟该海域潮流场的基础上,运用能量耗散原理,对该海域的潮流能资源可开发量进行了评估。结果表明,在转换装置的拖拽系数为0.07时,面积为27km2的成山头近岸海域的可开发潮流能资源约为17.9MW,其中大潮期间的可开发量高达37.7MW,而小潮期间则为7.3MW。在此条件下,该海域大潮期间涨急和落急时刻的流速分别减小了40%和38%,但发电装置对潮汐的影响较小,在成山头顶端的高潮潮位仅下降了4cm。     

海底动力环境原位监测中数据管理系统的设计

海底动力环境原位监测在海底监测中的重要性不言而喻.而数据管理系统是海底动力环境原位监测中的核心模块.数据管理系统以ARM9为硬件核心、Linux2.4.20为软件平台,集成三台深海仪器,为岸上基站与深海仪器之间提供实时的、可靠的控制及数据接口.经实验验证该系统可以稳定地为岸上基站提供实时动力环境数据,最后提出了系统还待完善的几个问题.     

Investigation on performance of all optical buffer with large dynamical delay time based on cascaded double loop optical buffers

Optical buffers are critical for optical signal processing in future optical packet-switched networks. In this paper, a theoretical study as well as an experimental demonstration on a new optical buffer with large dynamical delay time is carried out based on cascaded double loop optical buffers (DLOBs). It is found that pulse distortion can be restrained by a negative optical control mode when the optical packet is in the loop. Noise analysis indicates that it is feasible to realise a large variable delay range by cascaded DLOBs. These conclusions are validated by the experiment system with 4-stage cascaded DLOBs. Both the theoretical simulations and the experimental results indicate that a large delay range of 1--9999 times the basic delay unit and a fine granularity of 25 ns can be achieved by the cascaded DLOBs. The performance of the cascaded DLOBs is suitable for the all optical networks.     

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.     

地层测试评价仪在渤海油田的应用

电缆地层测试是求取储层流体性质、进行储层评价最为直接的方法之一。地层测试评价仪（FET）是国产新一代地层测试评价仪器,不仅可以精确测量地层压力并根据压力剖面确定地层流体类型和油气水界面,而且在目的层取样时可以抽排污染流体、实时检测地层流体特性,对确定地层流体性质和分析流体成分起到了重要作用,同时它也可以计算地层渗透率,进行储层产能预测。通过在渤海油田的成功应用,简单介绍FET的基本工作原理和主要用途,重点论述其优越性和局限性,以及在渤海油田成功应用的典型实例,这对FET在其它油田的推广应用具有参考意义。     

顺序扫描ICP—AES法测定海洋沉积物中九种主要成分

用ICP—AES法测定海洋沉积物中铝、铁、钙、镁、钠、钾、钦、锰、磷等九种主要成分,方法简便,省时省力,测量精密度小于4％,可以满足海洋地球化学的要求。