使用量化器件获得高精度测量方法的几点讨论

本文从列阵器件测量精度的估计公式出发，推导了用低精度Ａ／Ｄ变换器件获得高精度测量结果的一般性证明，还讨论了这种方法的若干可能应用。     

A Simple Shear Model for the Asymmetry in the Paleoproterozoic Fold Belt in Liaodong Peninsula

IntroductionThe Liaodong Paleoproterozioc fold belt is locat-ed at eastern China -- Korea craton, from Liaodongpeninsula through southern Jilin to north Kore$tothe east, to west Jiaodong peninsu1a to the west. Al-though many discussions, in the literature…     

扇贝氨基多糖的红外光谱分析

从海湾扇贝中提取出具有抗凝活性的氨基多糖，其中，氨基己糖含量为２２．６０％，己糖醛酸含量为２３．３０％，含硫量为６．６６％。样品经ＫＢｒ压片，于１０ＤＸ－ＦＴＩＲ红外光谱仪中进行光谱扫描，发现，该多糖具有典型的氨基多糖红外光谱，分子中含有－ＮＨ，－ＣＯＯ，－ＯＳＯ３＾－等氨基多糖特征基团。与氨基多糖标准品－肝素，６－硫酸软骨素和透明质酸的红外光谱进行比较分析，表明，扇贝氨基多糖与肝素的红外光谱相似     

因子分析法在密鲴生殖力研究中的应用

应用因子分析法研究密鲴繁殖力与诸因素的关系。六个变量是体长、体重、成熟系数、绝对怀卵量和相对怀卵量。29个样本、经正交变换得到3个因子:绝对繁殖因子、相对繁殖因子和成熟因子。     

地磁日变观测仪器的对比分析

当前海洋磁力探测中为了消除或减小地磁日变化的影响,必须设立地磁日变观测站（简称日变站）测量磁场变化,提供日变校正资料。依据多年工作经验,对作为基站使用的G882磁力仪和Sentinel磁力仪在工作原理、仪器技术性能、工作使用体会等方面进行综合比较分析。结果表明,Sentinel磁力仪比G882磁力仪对环境适应性更好、灵活性更强,进行日变观测时应优先选用。     

科学工作流技术及在天文研究中的应用探讨

近几年来虚拟天文台技术的发展极为迅速,各国虚拟天文台研究相继启动,一系列虚拟天文台标准被提出并投入应用,有效地推动了信息技术在天文研究中的应用。科学工作流技术作为高性能计算与虚拟天文台中的关键技术,一直是研究的重点。但长期以来,受到业务工作流技术的影响,科学工作流的具体功能与作用,一直不被广大天文工作者理解和重视,限制了科学工作流的推广与应用。对科学工作流进行了深入分析,介绍了其基本功能和业务模型,详细比较了与业务工作流的差异。最后讨论了科学工作流在天文研究中的应用方法,对科学工作流的发展进行了展望。     

pRPL 2.0: Improving the Parallel Raster Processing Library

This article presents an improved p arallel R aster P rocessing L ibrary – pRPL version 2.0. Since the release of version 1.0, a series of modifications has been made in pRPL to improve its usability, flexibility, and performance. While retaining some of the key features of pRPL, the new version has gained several new features: (1) a new DataManager class has been added for integrated data management, and to facilitate data decomposition, assignment mapping, data distribution, Transition execution, and load‐balancing; (2) a GDAL‐based raster data I/O mechanism has been added to support various geospatial raster data formats, and provide centralized and pseudo parallel I/O modes; and (3) a static load‐balancing mode and a dynamic load‐balancing mode using the task‐farming technique are provided. A parallel zonal statistics tool and a parallel Cellular Automata model were developed to demonstrate the usability and performance of pRPL 2.0. The experiments using the California datasets showed that the performance altered when different pRPL options (i.e. load‐balancing mode, I/O mode and writer mode) were used for different algorithms, datasets, and varying numbers of processes.     

南海珠江口盆地深部烃类微渗漏的分子地球化学揭示

对南海珠江口盆地Site4B站位柱状沉积物可溶有机质中正构烷烃进行详细分析,结果显示海底以下65~70cm、80~85cm和85~90cm存在明显的似成熟烃类分布。在气相色谱质谱图上(GCMS),该处存在明显的UCM分布;在烃类分布上,该处以可溶有机质中高碳数正构烷烃奇偶优势趋于消失为特征,CPI为1.15~1.45。同时,整个剖面其他层段沉积有机质中可溶烃类仍以典型的近/现代沉积有机质输入为标志。结合区域地质背景,以及该区域天然气水合物的勘探发现事实,推断Site4B站位海底以下65~70cm、80~85cm和85~90cm烃类异常可能系深部烃类微渗漏所致。     

洋际交换及其在全球大洋环流中的作用:MOM4p1积分1400年的结果

利用非Boussinesq近似下MOM4p1的全球大洋环流预后模式,采用真实地形,以静止状态为初始条件,进行了1 400a积分,以研究平衡状态下大洋环流的结构。模式由月平均气候态强迫场驱动,包括192×189个水平网格和压力坐标下的31个垂直层次。着重研究达到平衡状态后,各洋际通道处的质量、热量输运和补偿及其在全球大洋环流中的作用。根据动能演变特征表明,积分过程分为3个阶段:风海流的成长及准稳定状态;热盐环流的成长过程以及热盐环流的稳定状态;由静止状态冷启动达到热盐环流的稳定状态,积分过程必须在千年以上。模式结果再现了从白令海峡到格陵兰海的北冰洋贯穿流和印度尼西亚贯穿流,并用已有观测资料对它们进行对比。分析表明,海面的倾斜结构是形成太平洋-北冰洋-大西洋贯穿流和印尼贯穿流的主要动力机制。分析指出,尽管在北大西洋存在1.4×106 m3/s的南向体积输运,但其热量输运却是北向的并达到1015 W量级,其原因是北向的上层海流温度远高于北大西洋深层水向南的回流。文章分析了经向体积和热量输运对北大西洋深层水补偿来源及大西洋经向翻转环流的贡献。模拟所得洋际交换的量值可以由经向补偿予以合理解释,并得到以往实测与数模结果的支持。洋际通道处的体积和热量交换突出体现了其在大洋传送带系统中的枢纽作用。     

东海南部净初级生产力与日本鲐生物量的关联性研究

Fish biomass is a critical component of fishery stock assessment and management and it is often estimated from ocean primary production（OPP）. However, the relationship between the biomass of a fish stock and OPP is always complicated due to a variety of trophic controls in the ecosystem. In this paper, we examine the quantitative relationship between the biomass of chub mackerel（Scomber japonicus） and net primary production（NPP） in the southern East China Sea（SECS）, using catch and effort data from the Chinese mainland large light-purse seine fishery logbook and NPP derived from remote sensing. We further discuss the mechanisms of trophic control in regulating this relationship. The results show a significant non-linear relationship exists between standardized CPUE（Catch-Per-Unit-Effort） and NPP（P〈0.05）. This relationship can be described by a convex parabolic curve, where the biomass of chub mackerel increases with NPP to a maximum and then decreases when the NPP exceeds this point. The results imply that the ecosystem in the SECS is subject to complex trophic controls. We speculate that the change in abundance of key species at intermediate trophic levels and/or interspecific competition might contribute to this complex relationship.