紫红笛鲷繁殖特性及诱导产卵的初步研究

描述紫红笛鲷Lutjanusargentimaculatus繁殖特性及人工诱导产卵的试验结果。紫红笛鲷养殖群体具有不完全的先雄后雌的性转化现象。1、2龄鱼全部为雄鱼,性腺成熟系数(GSI)为2.07%—4.85%;3龄亲鱼80%为雄鱼,20%转化为雌雄同体;4龄亲鱼性别转化基本确定,多数亲鱼为纯粹具有生殖机能的雄鱼,而在雌雄同体的亲鱼性腺中具有明显雌性第一性征的雌鱼仅占30%左右;雌雄同体的亲鱼性腺GSI为4.12%—8.09%,其中的卵巢GSI小于2%,4龄雌鱼怀卵量约70—100万粒;紫红笛鲷卵母细胞属非同步性发育,一个生殖季节能多次产卵。试验结果表明:低剂量的LHRH A2(3μg·kg-1)多次注射能有效地促进性腺发育、逐步成熟,并最终产卵,但对卵径小于300μm的亲鱼卵巢没有明显的诱导效果。在5μgLHRH A2+1000I UHCG·kg-1或5μgLHRH A2+500IUHCG·kg-1两种不同剂量的混合激素作用下,亲鱼的性腺都能迅速发育成熟,并能在小型循环式产卵池中自然产卵和受精。在水温为26.0—29.5℃的产卵池中,激素效应时间为35—43h。LHRH A2和HCG混合激素对卵母细胞直径达到400μm以上的紫红笛鲷亲鱼具有良好的促熟和催产效果,催产率达100%。如何减轻亲鱼之间相互残杀是改善雄鱼生理状况、保证雄鱼质量和提高卵子受精率必需解决的重要问题。     

离子交换水处理工艺与双室逆流再生离子交换床

例举了离子交换水处理工艺，讨论了逆流再生离子交换器的结构设计特点，并给出主要具体设备参数。     

大河影响下的陆架边缘海沉积有机碳的再矿化作用

大河影响下的陆架边缘海(RiOMars)是陆源有机碳的主要沉积汇,是陆海相互作用最重要的区域,在全球碳的生物地球化学循环中发挥着重要作用。受到RiOMars系统内频繁的物理和生物等改造作用的影响,该区沉积的有机碳并没有得到很好地保存而被永久埋藏,而是发生了显著的再矿化分解。本文首先对目前常用的基于O2消耗速率和CO2产生速率的两类测定RiOMars系统沉积有机碳再矿化速率的方法进行了介绍,分析了各自的优缺点和适用性,进而从碳的形态转化、表层沉积物混合均匀、形成次氧化的氧化还原条件、有机碳保存效率低、发生反风化作用和微生物发挥着重要作用等几个方面对RiOMars系统沉积物发生再矿化作用时的主要过程和特征进行了剖析,以期深入认识边缘海的再矿化作用及其对边缘海碳汇的影响。     

反渗透海水淡化给水工程的设计与应用

淡水资源短缺和水源污染已成为一个严峻的问题。“开源、节流、回用”是解决我国水问题的一个指导方针。反渗透海水淡化工程的建设,正在缓解淡水供需矛盾。文章在概述海水淡化产量与水价后,用国内外3个不同规模的实例描述反渗透海水淡化给水工程中的膜工艺设计与应用,给出海水淡化反渗透给水工程设计方案与淡化水厂的运行结果。     

The Maximum Effective Moment Criterion （MEMC） and Its Implications in Structural Geology

1 Introduction A high-level generalization of structures in the earth crust has been given by Ramsay (1980): low-angle thrusts in the brittle upper crust and high-angle reverse shear zones in the ductile middle-lower crust are formed in contractional regimes; high-angle normal faults in the brittle upper crust and low-angle normal shear zones in the ductile middle- lower crust are formed in extensional regimes. The formation of low-angle thrusts and high-angle normal faults in brittle domains …     

水力反循环连续取心(样)钻探在浅海砂矿勘查中的应用

概述了水力反循环(HRC—Hydraulic Reverse Circulation)连续取心钻探技术首次在我国海南砂矿勘查取心(样)钻探施工过程及取得的效果;总结了海上砂矿取心(样)钻探施工的经验。该技术的成功应用,为国内外开展海洋区域地质、海洋环境地质、海洋工程地质调查等钻探取心(样)施工提供了一种全新、高效实用的技术方法。     

普兰店元台逆冲推覆构造及控矿规律探讨

普兰店元台逆冲推覆构造为典型双重逆冲构造,以上叠式扩展而成。在自南向北逆冲过程中,形成褶皱推覆体,滞后断层,撕裂断层,反冲断层,并进一步形成构造窗和飞来峰。推覆构造形成于 J2-J3,逆冲推覆后期,花岗闪长斑岩沿逆冲推覆构造就位,其所携带的成矿热液在有利部位富集成金矿。     

Spatial distribution of micrometre‐scale porosity and permeability across the damage zone of a reverse‐reactivated normal fault in a tight sandstone: Insights from the Otway Basin,SE Australia

Knowledge of the permeability structure of fault‐bearing reservoir rocks is fundamental for developing robust hydrocarbon exploration and fluid monitoring strategies. Studies often describe the permeability structure of low porosity host rocks that have experienced simple tectonic histories, while investigations of the influence of faults with multiple‐slip histories on the permeability structure of porous clastic rocks are limited. We present results from an integrated petrophysical, microstructural, and mineralogical investigation of the Eumeralla Formation (a tight volcanogenic sandstone) within the hanging wall of the Castle Cove Fault which strikes 30 km NE–SW in the Otway Basin, southeast Australia. This late Jurassic to Cenozoic‐age basin has experienced multiple phases of extension and compression. Core plugs and thin sections oriented relative to the fault plane were sampled from the hanging wall at distances of up to 225 m from the Castle Cove Fault plane. As the fault plane is approached, connected porosities increase by ca. 10% (17% at 225 m to 24% at 0.5 m) and permeabilities increase by two orders of magnitude (from 0.04 mD at 225 m to 1.26 mD at 0.5 m). Backscattered Scanning Electron Microscope analysis shows that microstructural changes due to faulting have enhanced the micrometre‐scale permeability structure of the Eumeralla Formation. These microstructural changes have been attributed to the formation of microfractures and destruction of original pore‐lining chlorite morphology as a result of fault deformation. Complex deformation, that is, formation of macrofractures, variably oriented microfractures, and a hanging wall anticline, associated with normal faulting and subsequent reverse faulting, has significantly influenced the off‐fault fluid flow properties of the protolith. However, despite enhancement of the host rock permeability structure, the Eumeralla Formation at Castle Cove is still considered a tight sandstone. Our study shows that high‐resolution integrated analyses of the host rock are critical for describing the micrometre‐scale permeability structure of reservoir rocks with high porosities, low permeabilities, and abundant clays that have experienced complex deformation.     

A spatio-temporal data model for road network in data center based on incremental updating in vehicle navigation system

The technique of incremental updating,which can better guarantee the real-time situation of navigational map,is the developing orientation of navigational road network updating.The data center of vehicle navigation system is in charge of storing incremental data,and the spatio-temporal data model for storing incremental data does affect the efficiency of the response of the data center to the requirements of incremental data from the vehicle terminal.According to the analysis on the shortcomings of several ...     

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