基于图形数据库NEO4J的政务空间信息融合研究

随着信息化测绘时代的快速发展,整个社会产生了大量的信息资源.从数据规模角度来说,政府拥有国内最为庞大的数据储量,掌握着大量的、权威的、关键的数据资源,是大数据时代的"财富"拥有者.整合图形数据库NEO4J自带的融合检索服务引擎,分析、整理、融合、统计这些数据,建立索引,提取有用信息,提供友好的查询服务界面,是在大数据时代背景下值得思考的问题.     

MODIS数据北京城区热岛监测分析

随着城市化进程的深入,热岛效应问题越来越严重,从而影响城市及周边地区的生态环境与气候,因此备受人们的重视。本文从2000年—2007年724幅1km分辨率的MODIS地表温度产品中选取64幅质量较好,可以代表春、夏、秋、冬四个季节的昼夜影像,制作地表温度图和选取感兴趣区域分析北京城区热岛效应。结果表明,北京市城区温度明显高于周围地区,夏季夜间最高达到3.7℃,秋季白天相对热岛强度较大,夏季、冬季夜间热岛强度要大于白天,尤其冬季较为明显。     

Correlation study between ground motion intensity measure parameters and deformation demands for bilinear SDOF systems

The correlation between ground motion intensity measures （IM） and single-degree-of-freedom （SDOF） deformation demands is described in this study. Peak ground acceleration （APG）, peak ground velocity （VPG）, peak ground displacement （DPG）, spectral acceleration at the first-mode period of vibration [As（T1）] and ratio of VPG to APG are used as IM parameters, and the correlation is characterized by correlation coefficients p. The numerical results obtained by nonlinear dynamic analyses have shown good correlation between As（T1） or VPG and deformation demands. Furthermore, the effect of As（T1） and VPG as IM on the dispersion of the mean value of deformation demands is also investigated for SDOF systems with three different periods T=0.3 s, 1.0 s, 3.0 s respectively.     

CT引导下20G切割式穿刺活检针在胸部病变活检中的临床应用

目的:探讨CT引导下20G切割式穿刺活检针在胸部病变活检中的临床应用价值,并分析并发症情况。材料和方法:回顾性分析资料完整的72例CT引导下胸部穿刺活检病例,所用的活检器材均为20G切割式穿刺活检针。纵隔病变5例,胸膜病变5例,肺部病变62例。统计穿刺活检诊断准确性,恶性病变诊断敏感性、特异性,分析并发症及其影响因素。结果:穿刺活检病理诊断为恶性病变58例,良性病变8例,非特异性诊断6例,后均经手术切除、临床治疗或随访证实。穿刺活检诊断准确率95.8%(66/72),恶性病变诊断敏感性95.1%(58/61),特异性为100%(11/11),无假阳性病例。6例(8.3%)发生并发症:气胸4例,肺泡出血1例,少量咯血1例。结论:采用20G切割式穿刺活检针进行CT引导下经皮胸部穿刺活检准确率高、并发症少,具有较高的临床价值。     

PS材料加固土遗址风蚀试验研究

风蚀是西北干旱地区土遗址破坏的主要动力机制和成因,强烈的风蚀作用致使许多土遗址坍塌殆尽,导致这一不可再生资源的破坏。通过对土遗址的室内和现场风蚀模拟试验研究发现,经PS（高模数硅酸钾）材料加固后土遗址的抗风蚀能力明显增强。室内试验发现,风蚀量随风速的增长而增加、随风蚀时间延长近线性增长,PS材料浓度大于5 %的加固试样,即使风速达20 m/ s时,风蚀量均小20 (kg/ m2)•h,抗风蚀强度提高 6～10 倍。现场模拟试验结果表明,加固材料的入渗深度和用量直接影响加固效果,中浓度PS材料加固的墙面抗风蚀能力最强。因此,选择适当的PS材料浓度、提高加固材料的渗透力是土遗址保护加固的关键,将对西北地区土遗址科学保护的全面开展起到重要的指导作用。     

河南省地热资源开发利用现状评价

基于河南省地热资源特点及其开发利用现状的基础上,分析总结了河南省各种类型地热水的开采情况。首先应用已采量与可采量的比值作为评价标准将地热水的开发利用程度为五类,评价了整个河南省新生界地热水、基岩地热水、温泉水的开发利用情况以及各地市城区的地热开采情况,提出河南省应积极地推广地热资源利用,对开采过热的地区要注意防止地热水位下降过快,对开采一般的地区要注意适度开发,对其他地区要结合自身实际鼓励开发。     

Phase Chemistry Study of the Dangxiongcuo Salt Lake Brine:Isothermal Evaporation at 25℃

正Production of lithium carbonate from brines has become the dominate trend in the world from the beginning of this century.Dangxiongcuo,a carbonate-type salt lake,is located in the interior of the Tibetan Plateau,China.As a salt lake deposit,rich in Li,B,K and other useful trace     

强度和变形参数的变化对土工有限元计算的影响

在土工问题的数值分析中,包含变形模量E、泊松比 两个变形参数的增量线弹性模型是一种常用的计算模型,研究和掌握E和 两个参数对土工有限元计算的影响有助于分析计算成果。首先,设想固定某一个参数而观察另一个参数变化对计算结果的影响;然后,说明用强度折减有限元法分析土坡稳定安全系数时,实际上已同时考虑了变形参数的影响。可采用剪应力? xy的等值线近似形成滑动面,滑动面单元的应力水平S等于1和特征点的位移发生突变共同作为失稳判据;最后,是用强度参数为纽带探讨这两个变形参数的互相变化关系,即E愈大,则土的强度愈大,? 愈小。     

Consistency Problem with Tracer Advection in the Atmospheric Model GAMIL

The radon transport test, which is a widely used test case for atmospheric transport models, is carried out to evaluate the tracer advection schemes in the Grid-Point Atmospheric Model of IAP-LASG （GAMIL）. Two of the three available schemes in the model are found to be associated with significant biases in the polar regions and in the upper part of the atmosphere, which implies potentially large errors in the simulation of ozone-like tracers. Theoretical analyses show that inconsistency exists between the advection schemes and the discrete continuity equation in the dynamical core of GAMIL and consequently leads to spurious sources and sinks in the tracer transport equation. The impact of this type of inconsistency is demonstrated by idealized tests and identified as the cause of the aforementioned biases. Other potential effects of this inconsistency are also discussed. Results of this study provide some hints for choosing suitable advection schemes in the GAMIL model. At least for the polax-region-concentrated atmospheric components and the closely correlated chemical species, the Flux-Form Semi-Lagrangian advection scheme produces more reasonable simulations of the large-scale transport processes without significantly increasing the computational expense.