实施贵州省“十二五”规划的矿产资源保障问题及加强地质工作的建议     

廖莉萍  练兵 《贵州地质》2011,28(2):81-85

根据贵州＂十二五＂规划纲要对矿产资源开发利用的需求,本文对贵州重要矿产煤、磷、铝及金的资源及开发现状,结合＂十二五＂对矿产规划目标要求,对贵州矿产资源保障程度及存在的地质问题进行分析,提出实施贵州＂十二五＂规划,加强矿产资源勘查的建议。  相似文献   

Tall building vibration control using a TM‐MR damper assembly: Experimental results and implementation     

Rene Zemp  Juan C. de la Llera  Paul Roschke 《地震工程与结构动力学》2011,40(3):257-271

This paper summarizes the relevant results of the design, construction, testing, and implementation of a nominal 120 kN magnetorheological damper developed to control a free‐plan tall building in Santiago, Chile, equipped with two 160‐ton tuned masses. Cyclic as well as hybrid simulation tests were performed on the prototype damper. Global building responses using measured MR properties showed good correlation with analytical estimations. Also, a proposed physical controller for the MR damper was validated through hybrid and building pull‐back tests. Its performance is essentially equivalent to that of an LQR controller, but the information needed in its implementation is considerably less. Pull‐back tests of 10 cm amplitude were performed on one mass along the flexible edge of the building and its response controlled using the passive and controlled modes of the MR damper. The MR damper was capable of controlling the TM displacements very effectively, as well as the simulated building response for different ground motions and harmonic excitation. Copyright © 2010 John Wiley & Sons, Ltd.  相似文献   

Bi‐directional coupled tuned mass dampers for the seismic response control of two‐way asymmetric‐plan buildings     

Keh‐Chyuan Tsai  Yi‐Jer Yu 《地震工程与结构动力学》2011,40(6):675-690

This paper proposes bi‐directional coupled tuned mass dampers (BiCTMDs) for the seismic response control of two‐way asymmetric‐plan buildings subjected to bi‐directional ground motions. The proposed BiCTMD was developed from the three‐degree‐of‐freedom modal system, which represents the vibration mode of a two‐way asymmetric‐plan building. The performance of the proposed BiCTMD for the seismic response control of elastic two‐way asymmetric‐plan buildings was verified by investigating the reductions of the amplitudes of the associated frequency response functions. In addition, the investigation showed that the proposed BiCTMD is effective in reducing the seismic damage of inelastic asymmetric‐plan buildings. Therefore, the BiCTMD is an effective approach for the seismic response control of both elastic and inelastic two‐way asymmetric‐plan buildings. Copyright © 2010 John Wiley & Sons, Ltd.  相似文献   

Tall building vibration control using a TM‐MR damper assembly     

Rene Zemp  Juan C. de la Llera  José L. Almazán 《地震工程与结构动力学》2011,40(3):339-354

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地市级地震局系统地震应急级别启动的讨论     

叶振民  蔡欣欣  刘仲达 《国际地震动态》2011,(7):34-37

以厦门市为例,从地震烈度衰减规律、当地社情及地市政府与省局政府职责的区别,讨论地市地震局应急预案应急级别启动条件与省局预案的差异和理由.  相似文献   

Simulation of spatially correlated earthquake ground motions for engineering purposes   总被引：4，自引：4，他引：0  

Yongxin Wu  Yufeng Gao  Dayong Li 《地震工程与工程振动(英文版)》2011,10(2):163-173

A new model to simulate spatially correlated earthquake ground motions is developed. In the model, the main factors that characterize three distinct effects of spatial variability, namely, the incoherency effect, the wave-passage effect and the site-response effect, are taken into account, and corresponding terms/parameters are incorporated into the well known model of uniform ground motions. Some of these terms/parameters can be determined by the root operation, and others can be calculated directly. The proposed model is fi rst verif ied theoretically, and examples of ground motion simulations are provided as a further illustration. It is proven that the ensemble expected value and the ensemble auto-/cross-spectral density functions of the simulated ground motions are identical to the target spectral density functions. The proposed model can also be used to simulate other correlated stochastic processes, such as wave and wind loads.  相似文献   

梯形面片数据模型及其空间运算应用     

王结臣  崔璨  陈刚  蒲英霞 《测绘学院学报》2011,(2)

提出一种新的基于梯形面片的空间运算方法,该方法将多边形要素预先分解成一系列的梯形面片,后续的空间运算将不再基于原始多边形要素进行操作,而是对分解产生的梯形面片进行更为简便的计算处理。梯形面片模型结合了常见矢量数据模型数据精度高、栅格数据模型运算简单等优点,在执行相关空间运算中与常见矢量和栅格模型相比具有优势。详述了该数据模型,并以点面包含分析和多边形叠置分析等实例探讨了其在空间运算中的应用,测试与分析表明该方法兼具数据精度高、算法实现简单等优点,能较有效地提高空间运算的执行效率。  相似文献   

DMC数码航摄区域网布点方案探讨     

王小准 《地理空间信息》2011,(4):109-110,113

相片控制测量是航空摄影测量的基础工作,传统航空摄影控制测量有成熟的作业方法和相应的技术标准和规范,而DMC航空摄影控制测量还没有制定相应的技术标准或规范,特别是在中小比例成图的应用中,更是一个空白。根据DMC航空摄影资料的特点和1：10 000地形图成图的精度要求,通过实例研究,总结区域网布点方案的规律性。  相似文献   

Detecting tents to estimate the displaced populations for post-disaster relief using high resolution satellite imagery     

《International Journal of Applied Earth Observation and Geoinformation》2015

Estimating the number of refugees and internally displaced persons is important for planning and managing an efficient relief operation following disasters and conflicts. Accurate estimates of refugee numbers can be inferred from the number of tents. Extracting tents from high-resolution satellite imagery has recently been suggested. However, it is still a significant challenge to extract tents automatically and reliably from remote sensing imagery. This paper describes a novel automated method, which is based on mathematical morphology, to generate a camp map to estimate the refugee numbers by counting tents on the camp map. The method is especially useful in detecting objects with a clear shape, size, and significant spectral contrast with their surroundings. Results for two study sites with different satellite sensors and different spatial resolutions demonstrate that the method achieves good performance in detecting tents. The overall accuracy can be up to 81% in this study. Further improvements should be possible if over-identified isolated single pixel objects can be filtered. The performance of the method is impacted by spectral characteristics of satellite sensors and image scenes, such as the extent of area of interest and the spatial arrangement of tents. It is expected that the image scene would have a much higher influence on the performance of the method than the sensor characteristics.  相似文献   

Investigation on Cutting Stability of Jacket in Decommissioning Process     

李美求  段梦兰  黄一 《海洋工程》2015,29(5):649-661

Jacket cutting operation is one of the most complicated and highest risk operations in the process of decommissioning offshore piled platform, the security and stability of which must be assured. In this paper, the current research on offshore structure removal and jacket cutting is introduced, on the basis of which the types of load along with the load calculation method are determined. The main influences on the stability of a jacket in cutting are analyzed. The experiment test plan is drawn by using orthogonal testing method, and the formula of critical load during the cutting procedure is deduced by differential evolution algorithm. To verify the method and results of this paper, an offshore piled platform to be decommissioned in the South China Sea is taken for an example, and the detailed schedule for jacket cutting is made with the three-dimensional finite element model of the jacket established. The natural frequency, stress, strain and stability of the jacket during cutting process are calculated, which indicates that the results of finite element analysis agree well with that of the deduced formula. The result provides the scientific reference for guaranteeing the safety of jacket in cutting operation.  相似文献