Seismic wave propagation analysis in vertical arrays at Kashiwazaki–Kariwa nuclear power plant site by using modified normalized input–output minimization (mod‐NIOM) method     

Santa Man Shrestha  Hideji Kawakami 《国际地质力学数值与分析法杂志》2011,35(7):787-806

A new approach on numerical modeling of wave propagation is introduced and is used to analyze the effect of earthquake magnitudes (ground motion amplitudes) on wave propagation. In this method, the sum of the maximum amplitudes of the first output model at time 0 s and rest of the output models at different times are normalized to unity. Considering this as a constraint, the sum of the weighted‐squared Fourier amplitudes is minimized by using the Lagrange multiplier method. The proposed method can reveal the relationship of actual time histories by showing simple clear peaks. This method is used to analyze the time histories of various earthquake events at different vertical array sites of the Kashiwazaki–Kariwa nuclear power plant of Tokyo electric power company (TEPCO). The wave arrival times obtained from this method and down‐hole measurements are compared. The results show increase in the arrival times at surface layer when the magnitude of earthquake is large. The results reveal that the amplitudes of small magnitude earthquakes at depths are small and are largely amplified at surface, whereas in case of large magnitude earthquakes, the amplitudes are large at depths and are deamplified at surface reflecting the effects of the strain‐dependent soil properties that result in non‐linear site response to strong shaking. The results also show that the reflected peak amplitudes are higher for small magnitude earthquakes than for large magnitude earthquakes. Copyright © 2010 John Wiley & Sons, Ltd.  相似文献   

The Behaviour of Loam and Its Differential Settlement     

Pan Peicai  Yang Muhuai  Zhang Wenmin 《岩土力学》1985,6(1):47-57

This paper deals with the relation between loam behaviour and its differential settlements. Experimental results obtained from the foundation soil of a phosphtic fertilizer plant show that factors influencing differential settlements are: (1) Comparatively large compressibility of foundation soil; (2) Anisotropic strength of foundation soil; (3) Overloading and repeat loading effects; (4) Fluctuation of underground water table; (5) Rheologic property of foundation soil.  相似文献   

坡面植被对坡面径流和入渗的影响   总被引：7，自引：0，他引：7  

满开言  林卓英 《地理研究》1989,8(4):78-85

通过人工模拟降雨和自然降雨试验,本文讨论了植被对雨水的截留和分流作用,以及坡面植被对水流入渗的影响。  相似文献   

Investigation of Arctic first-year and multi-year sea ice based on OSI-SAF microwave remote sensing data          下载免费PDF全文

Man Fukang  Xia Wentao  Zhang Jie  Ke Changqing 《极地研究》1988,31(1):69

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Geothermal and other effects on amino acid racemization in selected Deep-Sea Drilling Project cores     

Barry J. Katz  Christopher G.A. Harrison  Eugene H. Man 《Organic Geochemistry》1983,5(3):151-156

Kinetic parameters for the epimerization of isoleucine in multispecific foraminiferal asemblages were used to establish the effects of burial depth and the geothermal gradient on the extent of reaction. It was observed that with a little as thirty meters of burial in a normal thermal regime there were differences between the extent of epimerization measured and that which would have been predicted for thermal equilibrium with bottom water temperatures. As would be expected, these differences are greatest when the heat flow (the geothermal gradient) and/or the sedimentation rates are highest. These effects were observed in most of the DSDP samples studied, and have been used to estimate the average heat flux since the time of sample deposition. Occasional anomalous effects were observed which could not be related to past or present heat flux. These were determined to be due to such geologic occurrences as slumping and reworking or to recent sample contamination. Other problems emerged related to bottom water temperatures including changes over geologic time which are unknown and could not be deduced. Thus, the presence of epimerization anomalies in DSDP cores as noted above limits the effectiveness of amino acid geochronology in such cores, unless these anomalies can be recognized as ab initio.  相似文献   

GIS支持的澜沧江下游区泥石流爆发危险性评价   总被引：13，自引：8，他引：13  

闫满存  王光谦  刘家宏 《地理科学》2001,21(4):334-338

澜疮江下游区是我国泥石流灾害相对频发的地区之一，在分析泥石流形成发育影响因素的基础上，指出澜沧江下游区泥石流的爆发主要受沟道坡度，植被覆盖度／土地利用和降水等环境因素影响，据此，构建了泥石流爆发危险性评价数据库，知识库和危险性评价数字环境模型，在ARC／INFO，GIS的支持下，提取了坡度，植被盖度和降雨量等主要泥石流危险性评价指标。依据知识库对各类因子进行了分级和赋权，对澜沧江下游区泥石流爆发危险性进行了区划。  相似文献   

新疆耕地资源卫星遥感调查数据分析研究   总被引：8，自引：12，他引：8  

乔木  徐曼  岳健 《干旱区地理》2002,25(4):309-314

依据卫星遥感调查结果。分析新疆耕地资源类型（包括现耕地和后备宜耕地类型）的数量、质量、分布组合特点以及中低产田产生的原因及其后备宜耕荒地的限制因素，提出新疆耕地资源合理开发利用与中低产田治理的总体构思与设想。  相似文献   

海洋微藻多糖提取纯化条件的研究   总被引：4，自引：0，他引：4  

吴曼  李文权  张赛金  陈清花 《海洋技术学报》2004,23(1):9-12

研究了提取介质、超声条件和洗脱条件对海洋微藻多糖提取纯化效果的影响。实验结果表明不同pH的提取介质可以提取得到不同种类的多糖，超声条件以300W、20min最佳，用葡聚糖凝胶Sephadex-G200柱(长50cm，直径2cm)纯化粗多糖，当加样量为4ml，用0．2mol／L NaCl溶液洗脱效果最好。  相似文献   

Influence of food quality on egg production and viability of the marine planktonic copepod Acartia omorii     

Kyoungsoon Shin  Min-Chul Jang  Pung-Kuk Jang  Se-Jong Ju  Tea-Kyun Lee  Man Chang   《Progress in Oceanography》2003,57(3-4):265

Egg production, egg viability and fecal pellet production were determined for individual Acartia omorii, which were fed diets of two species of diatoms (Skeletonema costatum and Phaeodactylum tricornutum) and three species of dinoflagellates (Scrippsiella trochoidea, Heterocapsa triquetra and Cochlodinium polykrikoides). Diets were analyzed for fatty acid content as an indicator of food quality. Depending on the diet, egg production of A. omorii varied over time, diminishing with some diets (S. trochoidea, C. polykrikoides, P. tricornutum). This rate of reduction was much more rapid for a diet of C. polykrikoides, which caused egg production to decrease to ca. 2.4 eggs f⁻¹ d⁻¹ in only four days. As for all diets, egg viability was high at the beginning but with the C. polykrikoides and P. tricornutum diets, it rapidly decreased with time. Fecal pellet production also varied with time, depending on the diet. Egg production rate was closely correlated with fecal pellet production. There was no direct relationship between egg viability and egg production rate, but both egg production and viability were affected by the nutritional quality of food. Egg viability was also highly dependent on the composition of fatty acids in the eggs. Egg viability showed positive correlation with the ratio of ω3:ω6 groups among egg fatty acids, and negative correlation with the ratio of 20:5 (n−3) : 22:6 (n−3). While comparing several diets, egg production rate was higher on diets (H. triquetra and S. trochoidea) containing ample amounts of essential fatty acids such as 18:4 (n−3) and 22:6 (n−3). The results suggest that fertility of A. omorii was dependent upon the quality of the food, and dinoflagellate diets, with the exception of C. polykrikoides, were preferable to diatom diets.  相似文献   

Indicatrices of Scattering of Light and the Composition of Suspension in the Black Sea     

V. I. Man’kovskii  M. V. Solov’ev 《Physical Oceanography》2005,15(1):57-70

We analyze the data of measurements of the indicatrices of scattering of light in the Black Sea in winter 1991 and summer 1998, present their principal characteristics, and discuss their correlations and spatial variability. The data on scattering of light are used to determine the number and weight concentrations of various fractions of particles suspended in water. The characteristics of scattering of light and the composition of suspension in the Black Sea are compared with the data obtained in 1973 and with the data accumulated in the Aegean and Ionian Seas and in the Indian Ocean.__________Translated from Morskoi Gidrofizicheskii Zhurnal, No. 1, pp. 63–76, January–February, 2005.  相似文献