《汶川地震灾害地图集》简介     

成都地图出版社  成都 《国际地震动态》2009,(6):41-42

由国家科学技术部、国家测绘局、民政部、国家发展和改革委员会等部门主持编制、成都地图出版社出版的《汶川地震灾害地图集》已正式出版发行。徐冠华、马宗晋、  相似文献   

Change of Back Siltation in Lianyungang Harbor before and after Completion of the West Breakwater     

ZHANG Hua YU Zhiying  JIN Liu Graduate Student  State Key Laboratory of Esturine  Coastal Research  East China Normal University  Shanghai  P. R. China Professor  State Key Laboratory of Esturine  Coastal Research  East China Normal University  Shanghai  P. R. China Professor  Yangtze Estuary Waterway Construction Co. Ltd.  Shanghai  P. R. China 《中国海洋工程》1999,(3)

—On the basis of a comparison of the field hydrological,sediment and topographic data observedbefore and after the completion of the West Breakwater in Lianyungang Harbor,which has led to the changeof topography from a strait to a bay,a synthetical analysis is conducted on the change of back siltation.Theresults show that it is the change of coast line and the consequent change of hydrological condition and sedi-ment movement that has led to the change of back siltation in the harbor.This phenomenon is caused by thelag effects of water current,sediment movement and local adjustment of topography after the construction,and it tends to be stable.The results of analysis provide not only a basis for extension of Lianyungang Harborinto a deep water harbor,but also propose a case for the study of the change of back siltation in a harbor onmuddy coast.  相似文献   

The Equilibrium Coefficient Kp and Petroleum Exploration:Design of the New Generation of Petroleum Exploration Instrument     

FENG Weiheng  FENG Yun Shanghai Gamma Ray Technology Co.  Ltd.  Laohumin Rd.  Shanghai 《《地质学报》英文版》2000,74(3):685-691

The main reason why the application of nuclear technology in petroleum exploration has not yet been accepted by most exploration workers is that they are not clear about the homologous distribution features of oil and gas fields and radioactive radiation. The authors hold that the disequilibrium of uranium, radium and radon as a natural radioactive series is the basic feature in the use of this technology in petroleum exploration. The invention Gamma-ray Spectral Measurement of the Equilibium Coefficient Kp and Its Embodiment of the senior author now can readily solve that problem and replace the impedient measure of normalization of uranium and potassium to thorium that had to be proposed before. Application of this impedient measure has some limitations. In areas where the surface is covered by beach or river sands, thorium minerals such as monazite may be concentrated by placering. This could result in local thorium highs that would yield local uranium and potassium lows after normalization to thoriu  相似文献   

An Assembly Coastal Building Technique in Port Engineering     

陈育民  刘汉龙  陈泽  高玉峰 《中国海洋工程》2009,23(2):379-386

The assembly coastal hfilding technique initiated at home and abroad,is for a novel vertical standing harbor structure.Its main concept is the assembling components which can be combined and locked together to form a large caisson.Its application and future are discussed for a building.After many years of application and tests,the technique has a high stability,a wide range of application,low workload and fast construction speed.It can be widely applied in future for harbor engineering projects.  相似文献   

高速铁路列车噪声监测     

王瑞  雷震  李娴 《地震地磁观测与研究》2013,(5):322-327

通过对地震发生时铁路采取的应急处置措施和我国高速铁路地震监测系统现状的分析,提出建设铁路地震监测预警系统的必要性.为确定地震监测预警台站,研究在高速铁路沿线布置台站的技术方案,特在汉宜高速铁路进行列车通过噪声试验,采集列车通过测点引起的振动数据,探讨列车通过的最大振动加速度和测点与铁路正线距离之间的衰减关系.利用统计分析方法分析最大振动加速度和距离之间的衰减关系.利用频域分析方法设置低通滤波器,对列车引起的振动数据进行滤波,进一步减少列车对台站监测预警数据的影响,所提出的衰减关系及数据初步处理方法对高速铁路地震监测预警台站选取和建设具有指导意义.  相似文献   

The age of cataclysmic variables: A kinematical study     

T. Ak  S. Bilir  S. Ak  K.B. Coşkunoğlu  Z. Eker 《New Astronomy》2010,15(6):491-508

Using available astrometric and radial velocity data, the space velocities of cataclysmic variables (CVs) with respect to Sun were computed and kinematical properties of various sub-groups of CVs were investigated. Although observational errors of systemic velocities (γ) are high, propagated errors are usually less than computed dispersions. According to the analysis of propagated uncertainties of the computed space velocities, available sample was refined by removing the systems with the largest propagated uncertainties so that the reliability of the space velocity dispersions was improved. Having a dispersion of $51\pm 7\mathrm{km}{\mathrm{s}}^{-1}$ for the space velocities, CVs in the current refined sample (159 systems) are found to have 5 ± 1 Gyr mean kinematical age. After removing magnetic systems from the sample, it is found that non-magnetic CVs (134 systems) have a mean kinematical age of 4 ± 1 Gyr. According to 5 ± 1 and 4 ± 1 Gyr kinematical ages implied by 52 ± 8 and 45 ± 7 km s^?1 dispersions for non-magnetic systems below and above the period gap, CVs below the period gap are older than systems above the gap, which is a result in agreement with the standard evolution theory of CVs. Age difference between the systems below and above the gap is smaller than that expected from the standard theory, indicating a similarity of the angular momentum loss time scales in systems with low-mass and high-mass secondary stars. Assuming an isotropic distribution, $\gamma$ velocity dispersions of non-magnetic CVs below and above the period gap are calculated ${\sigma }_{\gamma }=30\pm 5\mathrm{km}{\mathrm{s}}^{-1}$ and ${\sigma }_{\gamma }=26\pm 4\mathrm{km}{\mathrm{s}}^{-1}$. The small difference of $\gamma$ velocity dispersions between the systems below and above the gap may imply that magnetic braking does not operate in the detached phase, during which the system evolves from the post-common envelope orbit into contact.  相似文献   

Application of particle swarm optimization on self-potential data   总被引：1，自引：0，他引：1  

Ertan Pek?en  Türker Yas  A. Yekta Kayman  Co?kun Özkan 《Journal of Applied Geophysics》2011,75(2):305-318

Particle swarm optimization (PSO) is a global search method, which can be used for quantitative interpretation of self-potential data in geophysics. At the result of this process, parameters of a source model, e.g., the electrical dipole moment, the depth of the source, the distance from the origin, the polarization angle and regional coefficients are estimated. This study investigates the results and interpretation of a detailed numerical data of some simple body responses, contaminated and field data. The method is applied to three field examples from Turkey and the results are compared with the previous works. The statistics of particle swarm optimization and the corresponding model parameters are analyzed with respect to the number of generation. We also present the oscillations of the model parameters at the vicinity of the low misfit area. Further, we show how the model parameters and absolute frequencies are related to the total number of PSO iterations. Gaussian noise shifts the low misfit area region from the correct parameter values proportional to the level of errors, which directly affects the result of the PSO method. These effects also give some ambiguity of the model parameters. However, the statistical analyses help to decrease these ambiguities in order to find the correct values. Thus, the findings suggest that PSO can be used for quantitative interpretation of self-potential data.  相似文献   

基于可拓评判法的黑土肥力质量评价   总被引：1，自引：0，他引：1  

秦焱  王清  张颖  许晖  陈慧娥 《吉林大学学报(地球科学版)》2011,(Z1):221-226

根据黑土肥力的实验特点及前人研究成果,选取与养分和理化性质相关的10个评价指标,包括有机质(SOM)、全氮(TN)、速效磷(AP)、速效钾(AK)、阳离子交换量(CEC)、酸碱度(pH)、容重(BD)、黏粒(CP)、>0.25mm水稳性团聚体(WSA>0.25)和分散率(DR),通过这些指标建立了新的黑土肥力质量评价体系。以该评价体系为参照,采用主成分分析法确定权重,运用可拓学理论对吉林省农业黑土的肥力质量进行综合评判。结果表明:WSA>0.25、BD和AP 3项指标权重最大,说明黑土肥力的主要限制因子可能为土壤的物理性质及有效磷肥含量;吉林省农业黑土的肥力质量以中等为主,占整个样品数的73%。  相似文献   

The effect of artificial feed on blood biochemistry profile and liver histology of wild saddled bream, Oblada melanura (Sparidae)     

Ferri J  Topić Popović N  Což-Rakovac R  Beer-Ljubić B  Strunjak-Perović I  Skeljo F  Jadan M  Petrić M  Barišić J  Simpraga M  Stanić R 《Marine environmental research》2011,71(3):218-224

Floating fish farms attract a great number of wild fish species, changing their behaviour and physiology. The saddled bream, Oblada melanura, sampled from populations aggregated around the Adriatic fish farm and from natural/control populations, were analysed for differences in eleven blood biochemistry parameters and liver histomorphology. The levels of lactate dehydrogenase (LDH), alkaline phosphatase (ALKP) and urea (URE) in cage-associated saddled bream (428.00±SD 321.56 U/L, 86.13±SD 39.87 U/L and 0.05±SD 0.16 mmol/L, respectively) were significantly lower than those observed in the control specimens (1047.06±SD 505.56 U/L, 125.75±SD 34.70 U/L and 1.99±SD 0.73 mmol/L, respectively). In contrast to that, concentrations of aspartate aminotransferase (AST) in cage-associated fish (87.63±SD 132.34 U/L) were higher than values noted for the control population (6.55±SD 5.90 U/L). URE and AST presented the main variables contributing to the discrimination between two analysed populations. One-way ANOSIM based on the blood parameters showed significant difference between saddled bream that fed around cages and those from the remote waters (R=0.697; P < 0.01). Hepatocytes of cage-associated fish contained large cytoplasmatic clear spaces indicating excessive accumulation of fat in the hepatocyte cytoplasm. All observed differences can be attributed to contrasting feeding behaviour of sampled populations but basic nutritional differences between them should be quantified in the future. Moreover, further research is necessary to detect their impact on the health status of the fish.  相似文献   

内蒙古达茂旗查干哈达庙铜多金属矿床地质特征     

胡格吉乐吐  姜大伟  杨丹妮 《地质与资源》2013,22(6):484-487

内蒙古查干哈达庙铜矿床位于内蒙-兴安造山带西段之华力西晚期褶皱带内,哲斯敖包复向斜南翼,受北东—北北东向断裂构造及下二叠统大石寨组变质岩系控制.该矿区矿化体赋存于下二叠统大石寨组三岩段(P1d3)的英安质凝灰岩、凝灰岩中,严格受北东向断裂构造控制.铜矿体为含铜石英脉体,赋存于北东向断裂构造中.矿区内共圈定7个铜矿体,矿体总体走向为北东—北北东向,倾角43⁷5°.铜矿体呈脉状、透镜状,有分支现象,厚度变化小,属稳定型.通过系统总结矿床的矿体地质、矿物成分、矿物嵌布及围岩蚀变特征,认为铜矿成矿与变质岩系、断裂构造、岩浆热液活动有关,矿床成因类型为岩浆热液型.  相似文献