Experiments on channel evolution caused by check-dam failure     

Wen-Hsiao TSENG  Hsiao-Wen WANG  Shih-Chieh CHOU  Yu-Lin KAO  Chjeng-Lun Shieh 《山地科学学报》2012,9(2):175-184

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松辽盆地南部地区营城组典型火山机构地质特征     

迟唤昭  董福湘  薛晓刚  刘财  司考 《吉林大学学报(地球科学版)》2019,49(6):1649-1657

在松辽盆地地质背景研究的基础上,根据盆地南部地区营城组火山岩地质特征对火山机构进行分类,描述其地质特征,并讨论其储层特征。将研究区火山机构分成3类9种,即熔岩类火山机构、碎屑岩类火山机构和复合火山机构3类;熔岩类火山机构包括粗面质熔岩火山机构、玄武质熔岩火山机构、安山质熔岩火山机构、英安质熔岩火山机构和流纹质熔岩火山机构,碎屑岩类火山机构包括玄武质碎屑岩火山机构、安山质碎屑岩火山机构和流纹质碎屑岩火山机构,以及复合火山机构共计9种。并统计了不同类型流纹质火山机构储层的储集空间类型及孔隙度,结果表明：流纹质复合火山机构储集空间类型复杂,储层溶蚀孔缝十分发育,储层物性最好;流纹质碎屑岩火山机构储层溶蚀孔缝较为发育,储层物性中等;流纹质熔岩火山机构储集空间类型单一,储层物性最差。将长岭断陷火山机构内部储层分为高孔-高渗型、中孔-中渗型和低孔-低渗型3类,且有利储层受岩性影响较小,受岩相影响较大。  相似文献   

A copula-based joint deficit index for droughts   总被引：1，自引：0，他引：1  

Shih-Chieh Kao  Rao S. Govindaraju 《Journal of Hydrology》2010,380(1-2):121-134

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Renovated controller designed by genetic algorithms     

Tzu‐Kang Lin  Yi‐Lun Chu  Kuo‐Chun Chang  Chia‐Yun Chang  Hua‐Hsuan Kao 《地震工程与结构动力学》2009,38(4):457-475

A novel smart control system based on genetic algorithms (GAs) is proposed in this paper. The system is comprised of three parts: the fiber Bragg grating (FBG) sensor‐based sensing network for structural health monitoring, the GA‐based location optimizer for sensor arrangement, and the GA‐based controller for vibration mitigation under external excitation. To evaluate the performance of the proposed system, an eight‐story steel structure was designed specifically to represent a structure with large degrees of freedom. In total 16 FBG sensors were deployed on the structure to implement the concept of a reliable sensing network, and to allow the structure to be monitored precisely under any loading. The advantage of applying a large amount of information from the sensing system is proven theoretically by the GA‐based location optimizer. This result greatly supports the recent tendency of distributing sensors around the structure. Two intuitive GA‐based controllers are then proposed and demonstrated numerically. It is shown that the structure can be controlled more effectively by the proposed GA‐strain controller than by the GA‐acceleration controller, which represents the traditional control method. A shaking table test was carried out to examine the entire system. Experimental verification has demonstrated the feasibility of using this system in practice. Copyright © 2008 John Wiley & Sons, Ltd.  相似文献   

Terrain attributes of earthquake‐ and rainstorm‐induced landslides in orogenic mountain Belt,Taiwan          下载免费PDF全文

Jr‐Chuan Huang  John D. Milliman  Tsung‐Yu Lee  Yi‐Chin Chen  Jiin‐Fa Lee  Cheng‐Chien Liu  Jiun‐Chuan Lin  Shuh‐Ji Kao 《地球表面变化过程与地形》2017,42(10):1549-1559

Landsliding induced by earthquakes and rainstorms in montane regions is not only a sculptor for shaping the landscape, but also a driver for delivering sediments and above‐ground biomass downstream. However, the terrain attributes of earthquake‐ and rainstorm‐induced landslides are less discussed comprehensively in Taiwan. As part of an island‐wide inventory, we here compare and contrast the landslide terrain attributes resulting from two catastrophic events: the Chi‐Chi earthquake (M _w = 7.6, September 1999) and typhoon Morakot (rainfall >2500 mm, August 2009). Results show that the earthquake‐induced landslides are relatively small, round‐shaped and prone to occur primarily in middle and toe of slopes. In contrast, the rainstorm‐induced landslides are larger, horseshoe‐shaped and preferentially occurring in slope toes. Also, earthquake‐induced landslides, particularly large landslides, are usually found at steeper gradients, whereas rainstorm‐induced landslides aggregate at gradients between 25° and 40°. Lithologic control plays a secondary role in landsliding. From an island‐wide perspective, high landslide density locates in the region of earthquake intensity ≥ VI or one‐day rainfall ≥600 mm day^?1. Through the landslide patterns and their terrain attributes, our retrospective approach sheds light on accessing the historical and remote events for close geophysical investigations. Finally, we should bear in mind that the landslide location, size, and terrain attributes varying with triggers may affect the landscape evaluation or biogeochemical processes in landslide‐dominated regions. Copyright © 2017 John Wiley & Sons, Ltd.  相似文献   

交变电磁场作用下煤吸附解吸电磁改性研究   总被引：1，自引：0，他引：1  

许考  刘明举  刘彦伟 《煤田地质与勘探》2003,31(3):23-26

用容量法对焦作朱村矿变质无烟煤在不同频率的交变电磁场中吸附解吸特征进行了研究。结果表明:在不同频率的交变电磁场作用下,煤吸附CO₂、N₂仍旧符合Langmiur方程;交变电磁场减弱了煤的吸附能力,减小了吸附常数b值,但饱和吸附量(a值)基本上不变,是典型的表面改性现象。   相似文献   

Responses of phytoplankton and its satellite bacteria to exogenous ethanol     

Abate  Rediat  Hetharua  Buce Hanoch  Patil  Vishal  Lin  Daner  Kifle  Demeke  Liang  Junrong  Chen  Changping  Sun  Lin  Kao  Shuh-Ji  Bi  Yonghong  Huang  Bangqin  Gao  Yahui 《中国海洋湖沼学报》2023,41(1):203-214

Journal of Oceanology and Limnology - The response of phytoplankton and its satellite bacteria to various concentrations (0.01%–10% v/v) of ethanol is studied. To elucidate the effect of...  相似文献   

A Review on Hydraulic Fracture Height Growth for Layered Formation     

Tan  Peng  Kao  Jiawei  Cheng  Fushan  Sun  Yiliu  Fu  Shihao  Ren  Lejia 《Geotechnical and Geological Engineering》2022,40(8):4057-4067

Geotechnical and Geological Engineering - The fracture vertical stretching distance and fracture morphologies have great impact on the stimulated reservoir volume and well production in layered...  相似文献   

用1999年集集地震序列建立台湾地区地震形变的三维模型及其特殊意义     

Rong-Yuh Chen  Honn Kao  Wen-Tzong Liang  Tzay-Chyn Shin  Yi-Ben Tsai  Bor-Shouh Huang  王艳华 《世界地震译丛》2011,(1)

编纂了台湾地区包括震源位置和震源参数的地震目录。选择的数据库用于建立与菲律宾海板块与欧亚板块俯冲和碰撞等各种构造运动有关的台湾地区三维地震形变模型。我们将整个台湾地区划分为10km间隔的三维网格,计算每个网格的地震矩释放量,即该网格内所有地震释放的地震矩总和。当一次地震的物理尺度超过网格尺寸10km时,相应的地震矩就分布在多个网格上。这种定量方法较好地描述了该地区地震矩释放的一级特征。值得注意的是,集集地震的发生,填充了震源区附近地震矩释放量在震前存在的明显不足。本文推测某个区域内地震矩分布的不足—填充模式可以应用于预测未来大地震的发生地点。根据这一观点,我们认为,集集地震可能会引起另外2次地震(北部的苗栗—新竹区和南部的嘉义区),这2次地震的破坏性及震级与集集地震类似,且靠近集集地震震源区。  相似文献   

Water storage loss in central and south Asia from GRACE satellite gravity: correlations with climate data     

Natthachet Tangdamrongsub  Cheinway Hwang  Yu-Chi Kao 《Natural Hazards》2011,59(2):749-769

Recent decrease of water supply in central Asia and south Asia affects billions of people here. By filtering the errors at higher frequency components and correcting for the contaminated components, we enhance the monthly GRACE gravity fields to improve the determination of change in equivalent water height (EWH). The water storage changes from GRACE and the GLDAS hydrology model all show decreasing trends in this region. At the annual and inter-annual time scales, significant correlations between the variations in EWH and the variations in temperature, precipitation and snow equivalent height are found, especially at high altitude stations, suggesting that climate change is the driving factor for the water depletion in central Asia and south Asia.  相似文献