PROTEM-37瞬变电磁测深系统及应用实例

PROTEM - 37仪器具有分辨率高、动态范围大、抗干扰能力强、探测深度较大等优良性能。简要介绍了该仪器的测深原理、工作装置、野外施工步骤以及资料的处理解释。对TEM和MT资料的联合反演作了有益的尝试。介绍了该仪器在探测地下洞穴、勘察金属矿以及煤田水文地质调查等方面     

Polycyclic aromatic hydrocarbon concentrations in urban soils representing different land use categories in Shanghai

An extensive soil survey was carried out in Shanghai to investigate the spatial distribution and possible sources of polycyclic aromatic hydrocarbons (PAHs) in urban soils. Soil samples were collected from highways, iron-smelting plants, steel-smelting plants, shipbuilding yards, coking plants, power plants, chemical plants, urban parks, university campuses and residential areas and were analyzed for 16 PAHs by gas chromatography with mass detection. High PAH concentrations were found in all locations investigated, with mean values of soil total PAH concentrations in the range 3,279–38,868 μg/kg DM, and the PAH concentrations were significantly influenced by soil organic matter content. Soil PAH profiles in all districts were dominated by PAHs with 4–6 rings. Principal components analysis and diagnostic ratios of PAHs indicate that they were mainly derived from coal combustion and petroleum but in soils from highways the PAHs were derived largely from vehicle exhaust emissions. The high concentrations of PAHs found indicate that many urban soils in Shanghai represent a potential hazard to public health.     

遥感信息协同智能网格模型设计及实现

为了给普通用户提供一个自动化、智能化的遥感信息处理平台,以OGSA(Open Grid Services Architecture) 为基础,结合多智能体技术,提出了基于协同智能网格的遥感信息处理模型RSCIG(Remote Sensing Cooperative Intelligent Grid);设计了RSCIG的体系结构,详述了如何高效准确地协同现有的网格服务以完成所面临的任务;实现了一个RSCIG体系结构下的遥感信息处理原型系统.     

内蒙古翁公敖包航磁异常的推断与解释

文章对内蒙古四子王旗—土默特右旗中北部近年发现的翁公敖包航磁异常进行推断与解释,在对找矿有望的航磁异常进行筛选后,对翁公敖包航磁异常进行了野外地质-地球物理查证,确定异常为铁矿所致;采用向上延拓、垂向导数、斜导数及小波变换等方法对航磁异常进行数据转换处理,以获取铁矿体的横向及纵向分布信息,取得了较好的效果。     

Aliphatic biomarker signatures of early Oligocene-early Miocene source rocks in the central Qiongdongnan Basin: Source analyses of organic matter

The geochemical signatures of fifty-four rock samples and three supplementary drill stem test(DST) oils from the Yacheng-Sanya formations in the central Qiongdongnan Basin(CQB) were analysed. Reconstruction of the early Oligocene-early Miocene(36–16 Ma) palaeovegetation and source analyses of organic matter(OM) were conducted using aliphatic biomarkers in ancient sediments and DST oils. Both the interpreted aquatic and terrigenous OM contributed to the CQB source rocks(SRs) but had varying relat...     

An Effective Control System of Thrust and Moment Modulation for a Dynamically Positioned Vessel

Dynamic positioning (DP) is an operation method whereby the position of a surface vessel is maintained in close proximity to a required position in the horizontal plane through the controlled application of forces and moments generated by purposely installed thrusters. When estimating thrust, this kind of conventional control system often uses many acceleration sensors, velocity sensors, environment sensors, and filters. Usually, these sensors have measured electrical errors. To reduce the number of sensors used and to decrease the measurement errors, this article presents an effective control system for estimating thrust and moment commands, which is based on energy and impulsemomentum principles. Donha and Brinati's example is followed to verify the feasibility of the present control system, which performs semisubmersible platform positioning using an LQG controller, and the results are feasible and economical. A simulated coring vessel marine positioning in southern Taiwan is presented, which can estimate the counterthrust and moment commands, and the complex environmental forces and moments are described. The results can provide a valuable control system for dynamically positioned vessels.     

A new approach to the determination of the critical slip surfaces of slopes

A new method for the determination of the critical slip surfaces of slopes is proposed in this paper.In this paper,the original critical slip field method is extended in terms of the total residual moment,values of residual work as well as the unbalanced thrust force at the exit point for a given non-circular slip surface.The most critical slip surface with the maximum representative value for a prescribed factor of safety will be optimized and located using the harmony search algorithm.The prescribed factor of safety is modified with certain tiny interval in order to find the critical slip surface where the maximum representative value is zero.The aforementioned approach to the location of the critical slip surface is greatly different from the traditional limit equilibrium procedure.Three typical soil slopes are evaluated by use of the proposed method,and the comparisons with the classical approaches have illustrated the applicability of the proposed method.     

威海近岸人工鱼礁布设对生物资源恢复效果

为了解人工鱼礁投放对区域内海洋生物资源恢复效果,于2013年3月至2014年1月在北黄海近岸人工鱼礁投放区进行调查。结果显示,该海区发现浮游动物53种,其中优势种为浮游桡足类。夏秋季底栖生物幼体成为季节性优势种。游泳动物共发现14种,主要为常见的礁区鱼类。底栖动物共12种,其中棘皮动物海燕为绝对优势种,为近岸养殖生物的主要敌害生物,主要的底栖资源优势种为虾蟹类与软体动物。投礁区的浮游动物与游泳动物物种数明显多于未投礁区,表明人工投礁有助于生物群落的恢复,提高生物多样性,改善区域生态系统。但该海域大型底栖藻类较少,还应进一步对大型底栖藻类增殖以提高海域初级生产。     

一种针对规则冲突的规则集语义比较算法

应用DFD(Diverse Firewall Design)方法进行防火墙规则集设计时,需使用规则集语义比较算法,判断多个规则集是否语义一致。规则冲突是导致规则集语义不一致的主要原因。因此,需要研究针对规则冲突的规则集语义比较算法。而现有算法时空复杂度较高,性能低下。文中提出了1种基于关键数据包选取映射的规则集语义比较算法(KPCM)。KPCM算法针对规则冲突选取关键数据包,并通过比较这些数据包在不同规则集中的处理动作,判断这些规则集是否语义一致。理论分析和测试表明,KPCM算法时空性能均优于现有算法。     

网箱养殖大黄鱼越冬期间脂肪酸的相对含量变化

利用气-质法(GC-MS)对越冬期间海水平均温度在20,16,12,10和8 ℃条件下的2龄大黄鱼肌肉和肝脏组织中脂肪酸组成及相对含量进行分析,结果表明:随着海水水温的降低,机体会增加不饱和脂肪酸含量,尤其是EPA[C20:5(n-3)],EPA在肌肉中的含量从20 ℃时5.71%增至8 ℃时8.06%,在肝脏中从20 ℃时6.76%增至8 ℃时8.44%。由此可见,在越冬禁食条件下,大黄鱼机体通过自身的脂肪酸动态转化和代谢,减少饱和脂肪酸含量,而增加不饱和脂肪酸含量,以此增加膜的流动性,抵御寒冷。