海洋平台响应多点解耦的冰力测量方法

提出了一种通过传递函数在频域内进行解耦逆推多点冰力的计算方法,并以一个四桩腿平台为例,给出了冰力问接测量的设计方案及计算流程,从而为解决海上平台所受冰力的测量问题找到一个较好的技术途径。     

山东半岛北及东沿岸海域冬季的逆温跃层及其与深底层逆流的关系

引用《渤海、黄海、东海海洋图集——水文》分册中有关逆温跃层分布变化图幅以及海流和温、盐度历史资料 ,指出山东半岛北及东沿岸区域冬季出现的逆温跃层现象与这里冬季潜伏于深底层暖流水有密切关系 ,并进一步认为围绕山东半岛北及东沿岸海域冬季的海水交换可能呈 2层模式 :在上层 ,低温、低盐的沿岸水自西向东南下 ;在深底层 ,相对高温、高盐的逆流水北上自东向西有直逼渤海海峡南部的势头。     

һ���������������·�����

?÷???????????????????????Щ????о???????????????????????·,????Χ0??360????????????????·?????????????????????·??????????????????????侫????2.8??????????????     

基于视频的交通流参数智能检测系统研究

实现了一种利用计算机视觉和图像处理的方法来检测车流的智能检测系统。首先利用输入的图像序列完成自适应的背景重建,通过目标分割和特征提取实现目标检测和运动跟踪,然后提出将HSV颜色空间特征应用于车辆目标匹配的方法和一种新的快速非均匀量化算法,用于跟踪发生融合的目标,最后对各交通流参数进行计算和统计,并对系统实现过程中出现的问题进行分析和总结。     

大骨山滑坡病害成因分析及工程防治对策

大骨山滑坡病害位于福建泉三高速公路YK128+630m～YK129+050m路段,病害区为凹形坡地,地层上部为第四系冲洪积层,下部为残积层及基岩风化带。依据现有地形地貌特征及钻孔揭露岩芯可判断该处为一古滑坡。斜坡上部隧道洞门施工致使坡顶开裂、洞口顶部坍塌。由于斜坡中下部下伏基岩的弱透水性,在降雨及病害区地表水的作用下,在岩土层地质界面处易形成软弱带,致使古滑坡有复活的迹象,古滑坡的复活将造成斜坡上部牵引破坏,并最终危及斜坡上部隧道洞口的稳定,为确保隧道洞口及斜坡中下部在建的林畔坑大桥的稳定与安全,采用Morgenstern-Price极限平衡分析方法,对斜坡分级进行稳定性分析计算,依据计算结果对滑坡病害进行针对性治理,在古滑坡中下部布置了锚索抗滑桩,为防止桥身墩位发生变形,在桥墩山侧布置锚索护桩。同时为消除地表水及降雨入渗对滑坡病害的影响,有针对性的在坡周及坡脚进行了截水与引水工程防治。     

北京城市贫困人口特征,成因及其解困对策

在经济与社会转轨时期,北京城市贫困人口总量显增加,并出现贫困人口群体多样化特征。贫困人口的成因既受国家经济结构高速和体制改革等的制约,也受人口自身身体状况、化素质和思想观念等的影响,因此,需要采取多种措施摆脱贫困。     

自动排绳计数绞车的研制与应用

绳索绞车是绳索取心钻探工作中不可缺少的设备。针对目前绳索绞车应用过程中暴露出的无法有序排列钢丝绳和计算钢丝绳使用长度等问题,研究设计了自动排绳器和计数器。野外试验证明,自动排绳器和计数器均达到了理想的设计效果。     

Improved Inter‐calibration of Faraday Cup and Ion Counting for In Situ Pb Isotope Measurements Using LA‐MC‐ICP‐MS: Application to the Study of the Origin of the Fangshan Pluton,North China

A laser ablation multi‐collector inductively coupled plasma‐mass spectrometry (LA‐MC‐ICP‐MS) method was developed to obtain precise and accurate Pb isotopic ratio measurements in low‐Pb materials (< 10 μg g^?1) using a combination of Faraday cups and ion counters (FC–IC). The low abundance ²⁰⁴Pb (~ 1.4%) was collected using an IC. A NBS 981 standard solution was used to cross‐calculate the FC–IC gain and to investigate the signal response characteristics of the IC. A significant, continuous and linear decrease in the FC–IC gain was observed within 1 hr, but this drift could be corrected using the calibrator‐sample‐calibrator bracketing method. In addition, a non‐linear response of the IC used in this study was observed and corrected by a non‐linear correction algorithm, which was established by measuring a series of gravimetrically prepared NBS 981 standard solutions (NIST SRM 981). Compared with the conventional arrangement, the use of the newly designed X skimmer cone and Jet sample cone improved the signal intensities from Pb isotopes by a factor of 1.9. Compared with only Faraday cups, using a combination FC–IC array was found to enhance the measurement repeatability (RSD) of ^20xPb/²⁰⁴Pb by approximately one order of magnitude when the ²⁰⁴Pb intensity was < 8 mV. Eight natural glasses and the NIST SRM 612 reference material glass (as a calibration material) were measured to evaluate the new protocol for Pb isotope determination. The analytical results were in agreement with the reference values within 2s measurement uncertainties. For MPI‐DING ATHO‐G (5.67 μg g^?1 total Pb), KL2‐G (2.07 μg g^?1 total Pb) and ML3B‐G (1.38 μg g^?1 total Pb), the typical accuracies of ^20xPb/²⁰⁴Pb were 0.09% of preferred values with precisions of < 0.33% (2RSD). The Pb isotope ratios in feldspars from granodiorite and within mafic microgranular enclaves (MMEs) from the Fangshan pluton, North China, were measured using the present method. The Pb isotopic compositions of feldspars from the whole host granodiorite show that that are radiogenic in the margin zone and gradually become less radiogenic. For the MMEs, the Pb isotopic compositions of feldspars are highly variable and overlap with those of the whole host granodiorite. For single‐grain feldspar, the strong rim‐core‐rim variations of the Pb isotopic compositions and trace elements are interpreted to have been generated via magma mixing. These results suggest that the Fangshan pluton underwent magma mixing of mantle‐derived mafic magmas with felsic magmas, and the proportion of the mafic magma influx decreased over time.     

三明市某花园滑坡治理措施及开挖边坡稳定性分析

以三明宏宇花园二期联体住宅楼场的滑坡为实例,从影响滑坡的最重要因素岩土体结构面深入进行稳定性分析,提出治理措施.