消除全空域效应:原理、装置与应用实例

如何消除"全空域效应"是电磁勘探中的难题,国内外学者试图从基础理论、数据处理、测线布设等方面入手来解决,但存在求解条件苛刻、计算繁杂、技术实现困难、成本高等问题.文中提出了用屏蔽装置直接消除全空域效应以逼近地面式测量的新思路,研制了相应的装置,给出了使用方法和应用实例,取得了良好的实践效果.     

Long-Term Consistent Recalibration of VIRR Solar Reflectance Data Record for Fengyun Polar-Orbiting Satellites

The visible infrared radiometer(VIRR)is the first instrument with longest measurements equipped on the Fengyun(FY)polar-orbiting satellites.Through re-processin...     

The pattern,evolution, and mechanism of venture capital flows in the Guangdong-Hong Kong-Macao Greater Bay Area,China

As an important innovation flow, venture capital has been examined in urban network research. However, the segmentation of capital categories and the cross-scale connection of capital remain scarcely analyzed. This study focuses on the structure and industry differentiation of venture capital flows in the Guangdong-Hong Kong-Macao Greater Bay Area(GBA) and its cross-scale network characteristics. Based on a venture capital database covering capital amount, investment subject address information,...     

A systematic review on approaches and methods used for flood vulnerability assessment: framework for future research

Natural Hazards - Floods have always been associated with widespread devastation and destruction since the emergence of human civilization. The intensity of this disaster has been increasing due to...     

大洋洲地区矿产地数据库建设

依据数据库建库标准、建库流程、数据质量控制措施等方法和流程,构建了大洋洲地区铁、锰、铜、铝、金、镍、铀、稀土元素矿产地数据库。通过对矿产地数据特征与地学多源信息的综合分析,总结区域成矿规律,提供了矿产资源预测的基础数据。形成的数据库管理系统对资料管理、查询、利用更方便,表达更直观,分析和总结更有效。     

Application of the first internal transcribed spacer(ITS-1) of ribosomal DNA as a molecular marker to population analysis in farrer''s scallop Chlamys farreri

Sequence variation of the first internal transcribed spacer of ribosomal DNA （ ITS - 1 ） was examined and its application to the study of genetic variation was explored in four populations of farter＇ s scallop Chlamys farreri. ITS - 1 fragments, with a length of about 300 bp,of 78 individuals collected from Dalian, Qingdao, Yantai in China and Korea respectively were amplified via PCR, cloned and sequenced. Intra-genomic variation was examined by sequencing several clones of single individuals. Alignment and polymorphism analysis detected 44 haplotypes and 50 polymorphic sites which consist of 30 substitutions and 20 indels, indicating a high level of polymorphisms. Sequence analysis also showed a very low level of intra-individual variation. All these features validated the feasibility of application of ITS - 1 fragment to population analysis. Polymorphism analysis showed that the Korea sample has the richest genetic variation, followed by Yantai and Qingdao samples. AMOVA （analysis of molecular variance） showed that the majority （96.26%） of genetic variation was distributed within populations and 3.74% resulted from among populations, but with P 〈 0.05 （ = 0.042）, indicating that the populations in this study have significant divergence. This output was basically concordant with the result arising from RAPD data and different from that from mitochondrial 16S rDNA sequence data. Discussion on this inconsistency was made accordingly.     

海区兵要地志信息系统的设计与开发

介绍了海区兵要地志信息系统的组成及功能,以及系统设计的关键点。系统实现了多媒体海量兵要地志信息存储与查询功能;成功地将GIS技术引入到兵要地志系统中,突破了传统纸质兵要地志的局限性;成功地将不同类型的兵要信息集成在同一个界面上表达,具有很好的兼容性。     

阿根廷滑柔鱼渔场的初步研究

根据2001年12月至2002年4月"辽渔1号"在西南大西洋(57°W—60°W,41°S—47°S)的柔鱼生产调查资料,对作业渔场的渔获量和水温垂直分布特点进行了初步分析,并运用逐步回归法探讨了周产量(t/week)与各水层温度之间的关系。结果表明:(1)周产量在70t以上的作业区域全部在60°02′W—60°40′W,44°59′S—46°04′S范围内(简称南渔场),周产量在70t以下的作业区域绝大多数集中在57°47′W—58°2′W,41°54′S—42°2′S范围内(简称北渔场);(2)南渔场渔获的表层水温在12.2℃~15.1℃,北渔场渔获的表层水温在10.0℃~12.3℃,两渔场在20~70m水体均出现了强度不等的温跃层;(3)整个作业区域,周产量与水温存在线性相关,相关系数R=0.8515,其中南渔场相关系数R=0.9985,北渔场相关系数R=0.9313。     

A time-dependent numerical model of the mild-slope equation

On the basis of the previous studies, the simplest hyperbolic mild-slope equation has been gained and the linear time-dependent numerical model for the water wave propagation has been established combined with different boundary conditions. Through computing the effective surface displacement and transforming into the real transient wave motion, related wave factors will be calculated. Compared with Lin’s model, analysis shows that calculation stability of the present model is enhanced efficiently, because the truncation errors of this model are only contributed by the dissipation terms, but those of Lin’s model are induced by the convection terms, dissipation terms and source terms. The tests show that the present model succeeds the merit in Lin’s model and the computational program is simpler, the computational time is shorter, and the computational stability is enhanced efficiently. The present model has the capability of simulating transient wave motion by correctly predicting at the speed of wave propagation, which is important for the real-time forecast of the arrival time of surface waves generated in the deep sea. The model is validated against analytical solution for wave diffraction and experimental data for combined wave refraction and diffraction over a submerged elliptic shoal on a slope. Good agreements are obtained. The model can be applied to the theory research an d engineering applications about the wave propagation in a biggish area.     

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。