路南石林形态计量分析

从流域地貌结构的角度，分析了路南石林形态的相似性和差异性，并根据对石林形态测量的数据，借助于SPSS软件，运用多元统计学的方法，对石林形态进行计量分析，从而揭示了石林形态大小的内在本质规律-石林的高度与宽度的比值符合P-Ⅲ型曲线分布模型。     

天文光干涉与综合孔径技术的发展

本文简单介绍了光干涉与综合孔径技术发展的历史、国际上用于天文观测的一些著名光干涉仪的技术特点和进展、以及近年来我国开展的与光干涉 ,综合孔径技术有关的工作 ,最后简要介绍了在光学综合孔径技术领域所发展的光纤与集成光学等新技术     

Species composition and distribution of marine nematode community in the North Taiwan Strait

I~IOW~ne nelnatode is a ban gIOup of benthic OrgAnsrns. Abbot 5 000 spotes Of free-livingnelnatedes have ben dedbo so far, and it has ho estimated that abbot 20 (XX) are as yetunknoWn. Chinese bothologist has Paid attention to marine nelnatodes in China seas in yare. The spatial distribution and shoes commotion of marine nelnatedes in the HUanghe EstUary, Qinhuangdao waters, QingdaO Bay and Xiamen ~ have ho reported (Zhang etal., 1990, 1991, 1993; ac and Li, 1998). ~ new shoes in the…     

基于GIS的柘林湾生态信息系统

柘林湾生态信息系统以ArcGIS为开发平台，采用客户端／服务器的体系结构，基于ArcObjects的组件式二次开发而成，实现了柘林湾的三维实景模拟、生态数学模型与GIS的有效集成、分析评价结果与地理空间数据相结合等功能，具有可视化、智能化、易扩展、安全实用等特点．该系统的建成．极大地提高了柘林湾生态信息的现代化管理水平，并为制定柘林湾的污染防治与生态环境保护策略提供了强有力的支持．     

Identification of Pb sources in Yellow Sea sediments using stable Pb isotope ratios

Rapid economic developments in East Asian countries have inevitably resulted in environmental degradation in the surrounding seas, and concern for both the environment and protection from pollutants is increasing. Identification of sources of contaminants is essential to environmental pollution management. In this study, the provenance of anthropogenic lead (Pb), a major pollutant of Yellow Sea sediments, was determined for river mouth sediments, including those of the Changjiang, Huanghe, Han, and Geum Rivers, and for age-determined shelf core sediments through the measurement of Pb isotope ratios in the HCl-leached fraction using multi-collector inductively coupled plasma-mass spectrometry (MC ICP/MS). Anthropogenic Pb has accumulated in shelf core sediments since 1910, and its isotope ratios were estimated as 0.863–0.866 and 2.119–2.125 for ²⁰⁷Pb/²⁰⁶Pb and ²⁰⁸Pb/²⁰⁶Pb, respectively, from the mixing relationships of the two endmembers. River mouth sediments exhibited enough distinction in anthropogenic Pb isotope ratios to be discriminated: 0.874 (2.144) in the Huanghe, 0.856 (2.129) in the Han, 0.857 (2.122) in the Geum, and 0.854 (2.101) in the Changjiang for ²⁰⁷Pb/²⁰⁶Pb (²⁰⁸Pb/²⁰⁶Pb), respectively. Although isotope ratios of geogenic Pb in sediments dating before 1910 showed narrow ranges (0.842–0.845 and 2.088–2.100 for ²⁰⁷Pb/²⁰⁶Pb and ²⁰⁸Pb/²⁰⁶Pb, respectively), distinct isotope ratios in each core permitted source identification of sediments in the Yellow Sea based on geographic locations and the geogenic Pb of each river. By comparing the isotope ratios of the estimated anthropogenic Pb to source-related materials, the provenances of anthropogenic Pb in Chinese river sediments were presumed to be Chinese coal or ore, which is also a major source of atmospheric particulate Pb. The anthropogenic Pb in the shelf core sediments in the northern Yellow Sea originated from northern Chinese cities such as Beijing and Tianjin through atmospheric pathways. Pb isotope ratios indicated that Pb in Korean river sediments was characteristic of local Korean ores.     

池塘养殖和海上吊笼养殖仿刺参肠道菌群结构对比分析

实验采用平板分离及16S r DNA序列分析法研究池塘养殖和海上吊笼养殖仿刺参(Apostichopus japonicus)的前肠、中肠和后肠菌群结构并进行对比分析.结果显示,从海上吊笼养殖的仿刺参的肠道内分离鉴定的240株菌株分属于3个门、11个属和34个种.从池塘养殖仿刺参的肠道内分离鉴定的211株菌株分属于3个门、11个属和49个种.两种养殖模式仿刺参肠道菌群结构存在较大差异,且同一仿刺参肠道各部分之间的菌群结构也存在较大的差异.海上养殖仿刺参的肠道优势菌群为弧菌属(Vibrio)、Formosa属、希瓦氏菌属(Shewanella),池塘养殖仿刺参的肠道内优势菌群为弧菌属(Vibrio)、芽孢杆菌属(Bacillus)、喜盐芽孢杆菌属(Halobacillus).两个菌群共有菌株有7个种,存在于在不同的肠道部位.两种养殖模式比较发现池塘养殖仿刺参的肠道菌群的丰富度大于海上吊笼养殖的仿刺参,且池塘养殖仿刺参肠道内芽孢杆菌(Bacillus)等益生菌的占比较高,海上吊笼养殖仿刺参分离得到较多的弧菌属(Vibrio)细菌.本研究可为南方仿刺参人工养殖中潜在益生菌的筛选提供基础资料.     

Stress-induced evolution of anisotropic thermal conductivity of dry granular materials

Various factors, such as the volumetric fraction of constituents, mineralogy, and pore fluids, affect heat flow in granular materials. Although the stress applied on granular materials controls the formation of major pathways for heat flow, few studies have focused on a detailed investigation of its significance with regard to the thermal conductivity and anisotropy of the materials. This paper presents a numerical investigation of the stress-induced evolution of anisotropic thermal conductivity of dry granular materials with supplementary experimental results. Granular materials under a variety of stress conditions in element testing are analyzed by the three-dimensional discrete element method, and quantitative variations in their anisotropic effective thermal conductivity are calculated via the network model and conductivity tensor measurements. Results show that the directional development of contact area and fabric under anisotropic stress conditions leads to the evolution of anisotropy in thermal conductivity. The anisotropy induced in thermal conductivity by shear stress is higher than that induced by compressive stress because shear stress causes more significant changes in microstructural configurations and boundary conditions. The shear-stress-induced evolution of anisotropy between principal thermal conductivities depends on dilatancy as well as shearing mode, and the shear-driven discontinuity localizes the conductivity. Factors involved in the stress-induced evolution and their implications on the thermal conductivity characterization are discussed.     

External calibrator in global signal experiment for detection of the epoch of reionization

We present a conceptual design study of external calibrators in the 21 cm experiment towards detecting the globally averaged radiation of the epoch of reionization(EoR). Employment of external calibrator instead of internal calibrator commonly used in current EoR experiments allows removing instrumental effects such as beam pattern, receiver gain and instability of the system if the conventional three-position switch measurements are implemented in a short time interval. Furthermore, in the new design the antenna system is placed in an underground anechoic chamber with an open/closing ceiling to maximally reduce the environmental effect such as RFI and ground radiation/reflection. It appears that three of the four external calibrators proposed in this paper, including two indoor artificial transmitters and one outdoor celestial radiation(the Galactic polarization), fail to meet our purpose. Diurnal motion of the Galactic diffuse emission turns out to be the most probable source as an external calibrator, for which we have discussed the observational strategy and the algorithm of extracting the EoR signal.     

Dynamics of DOC of euphotic layer in the Taiwan Strait——Diurnal variation of large range

ThisstudywassupportedbytheStateEducationalCommittee(SEC)ofChina.INTRODUCTIONThedissolvedorganiccarbon(DOC),ordissolvedorganicmatter(DOM),isoneofthemostimPortantorganiccarbonreservoiroftheworld,whichmayaffectthecontentofCO2intheatmospherewithatime-scaleof1OOO~1OOOOyears(Hedges,1992).Theratesofproduction,degradationortransPortationofDOCareseveralmaindynamicalparametersofDOCintheeu-photiclayer.Inthispaper,wefocusonthediurnalvariationsofDOCinordertoestimatetheseparameters.METso…     

江西相山铀矿田地貌剥蚀特征及其控矿意义——磷灰石裂变径迹证据

本文以数字高程(DEM)地貌特征分析为基础,采用磷灰石裂变径迹测试和温度-时间反演模拟研究,分析江西相山铀矿田铀成矿后剥蚀程度的差异性,结合已知矿床的成矿特征,探讨地貌剥蚀程度与矿体保存之间的关系,为区域找矿提供指导.通过DEM合成图像和水系分布特征,表明相山铀矿田是一个遭受中等侵蚀的地貌区,相山主峰南北和东西侧地貌侵蚀差异特征明显.统计分析表明,已经发现的铀矿床、点的分布与次级火山机构关系密切,相山南部的次火山机构剥蚀较深,西部次火山机构剥蚀相对弱,而北部和西北部则处于中等剥蚀程度.磷灰石裂变径迹测试结果表明,相山铀矿田的南部和东部开始剥蚀的时间早于西部,但晚于相山主峰的剥蚀.利用磷灰石的裂变径迹长度和温度参数,进一步开展了温度-时间的反演模拟研究,结果显示相山西部快速隆升发生于40~60 Ma之间,相山南部和东部的快速隆升发生于60~75 Ma之间,相山主峰的快速隆升发生于75~100 Ma之间,表明相山主峰、相山东部及南部较西部经历了较长时间的剥蚀.结合现今区域地质体出露特征及铀矿化蚀变类型的空间展布规律、成矿深度的估算等,推测相山铀矿田东部和南部剥蚀程度较深,早期可能形成的中低温铀矿体被剥蚀殆尽;北部剥蚀程度中等,地表出露了形成深度稍深的碱交代蚀变矿床;而西部剥蚀程度较低,地表发育浅部低温成矿的酸交代蚀变铀矿床.据此推断,相山铀矿田的西部深部具有很好的找矿潜力.