关于光球横向磁场和电流的测定(英文)

本文给出了一个在观测中辨别光球横向磁场指向的一个判据。并证明了光球横向电流与横向磁场的指向无关,因而完全可以由向量磁象仪测定。     

Effects of spectral composition,photoperiod and light intensity on the gonadal development of Atlantic salmon Salmo salar in recirculating aquaculture systems (RAS)

Artificial lighting regimes have been successfully used to inhibit sexual maturity of Atlantic salmon in confinement.However,when these operations are applied in commercial recirculating aquaculture systems(RAS) using standard lighting technology,sexual maturation is not suppressed.In this study,an L_9(3~3) orthogonal design was used to determine the effects of three factors(spectral composition,photoperiod,and light intensity) on the gonadal development of Atlantic salmon in RAS.We demonstrated that the photoperiod at the tested levels had a much greater effect on the gonadosomatic index and female Fulton condition factor than spectral composition and light intensity.The photoperiod had a significant effect on the secretion of sex steroids and melatonin(P0.05),and a short photoperiod delayed sex steroid and melatonin level increases.The three test factors had no significant effects on the survival rate,specific growth rate,relative weight gain,and male Fulton condition factor(P0.05).The optimum lighting levels in female and male Atlantic salmon were LD 8:16,455 nm(or 625 nm),8.60 W/m~2;and LD 8:16,8.60 W/m~2,455 nm respectively.These conditions not only delayed gonadal development,but also had no negative effects on Atlantic salmon growth in RAS.These results demonstrate that a combination of spectral composition,photoperiod and light intensity is effective at delaying the gonadal development of both male and female salmon in RAS.     

红树林海岸的沉积物输运和碳沉降特征

Mangroves play an important role in sequestering carbon and trapping sediments. However, the effectiveness of such functions is unclear due to the restriction of knowledge on the sedimentation process across the vegetation boundaries. To detect the effects of mangrove forests on sediment transportation and organic carbon sequestration, the granulometric and organic carbon characteristics of mangrove sediments were investigated from three vegetation zones of four typical mangrove habitats on the Leizhou Peninsula coast. Based on our results, sediment transport was often "environmentally sensitive" to the vegetation friction. A transition of the sediment transport mode from the mudflat zone to the interior/fringe zone was often detected from the cumulative frequency curve. The vegetation cover also assists the trapping of material, resulting in a significantly higher concentration of organic carbon in the interior surface sediments. However, the graphic parameters of core sediments reflected a highly temporal variability due to the sedimentation process at different locations. The sediment texture ranges widely from sand to mud, although the sedimentary environments are restricted within the same energy level along the fluvial-marine transition zone. Based on the PCA results, the large variation was mainly attributed to either the mean grain size features or the organic carbon features. A high correlation between the depth and δ13C value also indicated an increasing storage of mangrove-derived organic carbon with time.     

CHZ-Ⅱ海洋重力仪重力敏感结构的性能测试与分析

在原有CHZ重力仪研制基础上,设计新一代海洋重力仪CHZ-Ⅱ并进行硬件搭建与测试。阐述了为CHZ-Ⅱ重力敏感结构设计的测试方案、实验过程及其结果分析,主要包括弹性系统的刚度、交叉耦合效应和漂移效应。实验表明,该结构在目前的测试内容下符合设计要求。     

顾及植被的复杂艰险地区多光谱遥感岩性识别

针对复杂艰险地区修建道路时,地质岩性难以现场获取的问题,该文利用ASTER多光谱遥感影像,研究和设计了一种顾及植被覆盖的复杂艰险地区多光谱遥感岩性信息识别提取方法.该方法根据植被覆盖情况先分类后进行岩性识别:对中高植被覆盖区进行植被信息的抑制处理,再对中低植被覆盖区采用主成分分析法进行岩性信息提取;对低植被地表裸露区域采用端元提取、光谱角填图的方法进行岩性信息的提取.最后将岩性识别提取结果与现场地勘结果进行对比验证.结果表明该方法进行岩性信息提取结果与已有的现场勘察结果基本一致,具有重要的参考和应用价值.     

河南省内乡县银洞沟银金多金属矿成矿年龄: 热液锆石LA-MC-ICP-MS U-Pb测年

北秦岭构造带广泛发育与古生代洋壳俯冲和碰撞造山有关的岩浆活动以及与造山过程有关的变质作用,但古生代热液脉型矿床在北秦岭构造带少见报道。银洞沟银金多金属矿为北秦岭构造带东部的一处中型热液脉型矿床,本文通过对该矿床赋矿围岩和含矿石英脉中锆石开展LA- MC- ICP- MS U- Pb测年和锆石成因研究,确定了矿床的形成时代,并探讨了矿床的成矿动力学背景。结果表明赋矿围岩黑云母二长花岗岩的形成时代为431. 4±2. 1 Ma,含矿石英脉中锆石结晶年龄为419. 4±5. 9 Ma,石英脉中锆石的岩相学、锆石中矿物和流体包裹体及锆石微量元素研究表明419. 4 Ma代表矿床的形成时代。结合前人的研究结果,确定银洞沟银金多金属矿为形成于晚志留世的造山型矿床,成矿作用与碰撞期后～420 Ma的变质作用密切相关,成矿流体来源于地层的变质脱水,成矿物质主要来源于秦岭岩群和二郎坪群。     

泉州市街道灰尘重金属污染评价

对泉州市街道灰尘中8种重金属元素Cu,Zn,Pb,Ni,Cr,Cd,Mn,Co的含量水平和分布特征进行分析,并采用地积累指数法对其污染状况进行评价。结果表明,泉州市街道灰尘中上述重金属元素平均含量分别是泉州市土壤背景值的7.12,27.36,12.80,6.94,2.29,28.49,1.64,3.2倍;与国内外城市街道灰尘中重金属平均含量相比,泉州市街道灰尘中上述重金属元素平均含量处于中等—偏高水平;Cr,Cu,Pb在工业区含量明显高于其它功能区,而Cr,Cu,Co,Ni含量在农业区最低。地累积指数评价结果表明,Zn为偏重度污染,Cd为中度污染,Cu,Pb,Ni为偏中度污染,Co为轻度污染,Cr,Mn为无污染。     

大气折射指数的结构参数与北方5～9月降雨的强相关现象

基于中荷合作项目"建立关于荒漠化和粮食保障的中国能量与水平衡监测系统"(CEWBMS),在国家卫星气象中心和国家林业总局的支持下,乾安大孔径闪烁仪于1999年10月安装并正式运行.利用2000-2005年5～9月大孔径闪烁仪(LAS)观测的大气折射指数的结构参数Cn2,采用独立性检验,证实了Cn2的高低与未来32h是否出现降雨(晴雨)存在显著相关关系.结合乾安气象站的有关气象观测数据,初步选择Cn2白天值以及夜间值以Cn2的24 h变量作为预报依据,建立基于Cn2预报未来32h晴雨的预报流程;并利用2006年Cn2的观测数据,依照预报流程对2006年进行了回报预报试验,正确率为42/47.     

“深水地平线”事故深海溢油输移扩散的数值模拟

为深入认识深海溢油输运过程和提高深海溢油事故的应急响应能力,文章以2010年墨西哥湾“深水地平线”事故为例,采用深海溢油输移扩散模型,以三维流场和海面风场为主要环境动力,数值模拟溢油深海泄漏后的浮射扩散、水体中输移扩散以及在风场和流场共同作用下在海面上输移扩散的全过程,同时模拟实施海底消油剂喷注处理措施后溢油输移轨迹和扩散范围的变化。研究结果表明：数值模拟结果与相关报道的悬浮油带实际观测结果以及美国国家海洋与大气管理局的海水异常遥感监测结果总体相符,可为更加全面和精细的深海溢油输移扩散数值模拟研究奠定良好的基础。     

国土综合整治三维模型碎片加载优化与调度

国土整治作为一项国家战略,是解决社会经济发展过程中土地利用问题的重要手段,能有效促进国土空间优化和治理土地退化,对于实施乡村振兴战略和推进生态文明建设具有重大意义。随着我国工业化、城镇化的推进,生产、生活、生态之间矛盾日益凸显,国土整治在全国各地广泛开展,尤其是三维可视化技术的应用发展迅速。但对于国土整治业务而言,三维模型存在数据量大、数据复杂且碎片化程度高等特点,使得三维数据的存储管理和加载调度难度大,制约了其在国土整治中的应用。本文针对国土整治三维数据,提出了存储结构优化方法、三维模型碎片加载优化方法和三维模型调度优化方法,并开展了试验验证和应用示范,验证了本文提出的方法能够有效支撑国土整治中的三维可视化相关业务。