搜索结果: 1-15 共查到“理学 po”相关记录28条 . 查询时间(0.062 秒)
在综合利用矩量法(method of moments, MoM)和物理光学(physical optics, PO)方法的过程中, 要精准识别和划分PO位置处于点光源照射情况下的暗区和亮区。传统的识别划分手段的时间复杂度为O(N2), 当面片数量N增多时, 所需的时间呈现出急剧增长的趋势。文中应用八叉树和后向追踪算法, 对PO亮区判断过程进行加速, 可将时间复杂度由N2降为NlgN。由于计算PO区...
Broadband waveforms and site effects at a borehole seismometer in the Po alluvial basin (Italy)
broadband data borehole seismometer site effect alluvial basin
2015/9/28
Broadband seismograms recorded at a borehole three-component (high dynamic range) seismic station in the Po Valley (Northern Italy) were analyzed to study the velocity structure of the shallow sedimen...
An inventory of river anomalies in the Po Plain, Northern Italy:evidence for active blind thrust faulting
tectonic geomorphology drainage anomaly blind thrust Po Plain 1802 Oglio Valley earthquake
2015/9/16
The Po Plain is a low-relief area characterised by active shortening accommodated by blind thrust faulting. In this almost flat region depositional rates are similar to tectonic rates and deformation ...
Active compressional tectonics, Quaternary capable faults, and the seismic landscape of the Po Plain (northern Italy)
Active compressional tectonics paleoseismology seismic hazard Po Plain foredeep seismic landscape
2015/8/26
It is commonly believed that the Po Plain is an area of low seismic hazard. This conclusion is essentially a combination of two factors: (1) the historical record of earthquakes, which shows a relativ...
Rapid response to the earthquake emergency of May 2012 in the Po Plain, northern Italy
Emilia 2012 sequence Rapid-response Temporary Seismic Network Sismiko Waveform data
2015/8/26
Rapid-response seismic networks are an important element in the response to seismic crises. They temporarily improve the detection performance of permanent monitoring systems during seismic sequences....
Seismic hazard in the Po Plain and the 2012 Emilia earthquakes
2012 Emilia earthquakes Seismic hazard Ground-motion recordings Design code spectra
2015/8/26
The Emilia earthquakes of May 20, 2012 (Ml 5.9, INGV; Mw 6.11, http://www.bo.ingv.it/RCMT/) and May 29, 2012 (Ml 5.8, INGV; Mw 5.96, http://www.bo.ingv.it/RCMT/) struck an area that in the national re...
Ground effects induced by the 2012 seismic sequence in Emilia:implications for seismic hazard assessment in the Po Plain
ESI 2007scale Coseismic effects Macroseismic intensity Seismic hazard Liquefaction-type phenomena
2015/8/26
Since May 16, 2012, a seismic sequence has affected a wide portion of the Emilia Region (northern Italy), chiefly for the Modena and Ferrara Provinces. The first mainshock (Ml 5.9; focal depth, ca. 6 ...
Geochemical features and effects on deep-seated fluids during the May-June 2012 southern Po Valley seismic sequence
Fluids Geochemistry Faults Temporal changes
2015/8/26
A periodic sampling of the groundwaters and dissolved and free gases in selected deep wells located in the area affected by the May-June 2012 southern Po Valley seismic sequence has provided insight i...
The INGVterremoti blog:a new communication tool to improve earthquake information during the Po Plain seismic sequence
Seismology Educational Public issues Earthquakes Seismic awareness Seismic hazard
2015/8/26
During a seismic sequence, it is extremely important that the population shaken by the earthquakes has continuous and timely information about the ongoing seismic activity. For this reason, a few days...
The July 17,2011,ML 4.7,Po Plain (northern Italy) earthquake: strong-motion observations from the RAIS network
17th July 2011 earthquake RAIS strong-motion network Po Plain Site effects Ground motion prediction equations Italian seismic code
2015/8/24
On July 17, 2011, at 18:30:23 UTC, a ML 4.7 earthquake occurred on the east side of the Po Plain (northern Italy), between the towns of Ferrara and Rovigo. The epicentral coordinates provided by the N...
The PASTA Project: Investigation of Po and Apennine Sediment Transport and Accumulation
Apennine Sediment Transport Accumulation
2015/7/29
The northwestern Adriatic Sea from the Po River mouth to the Gargano Peninsula (Figure 1) is an ideal location to study sedimentary processes that fill foreland basins and form epicontinental shelves....
2011年7月18日-21日，应北京大学城市与环境学院柴彦威教授的邀请，美国俄亥俄州立大学地理系社会与行为科学领域杰出教授、美国地理学家协会杰出贡献奖获得者关美宝（Mei-Po Kwan）教授到访城市与环境学院，开展为期4天5次的海外名家讲座。本次系列讲座由北京大学城市与环境学院、北京大学国际合作部共同举办，得到我校海外名家系列讲座计划的资助。讲座由柴彦威教授主持，同时邀请了清华大学、中科院、中山...
Monitoring of temporal and spatial variations in fumarole helium and carbon dioxide characteristics at Poás and Turrialba volcanoes, Costa Rica (2001-2009)
helium isotopes carbon isotopes Central America Costa Rica volcano monitoring
2017/8/9
We report results of a 9-year monitoring program that took place from 2001 to 2009 of the helium and carbon isotope (3He/4He, δ13C) and relative abundances ratios (CO2/3He) of fumarole sites at Poás a...
On the distribution of formaldehyde in the western Po-Valley, Italy, during FORMAT 2002/2003
formaldehyde western Po-Valley Italy
2009/12/31
Formaldehyde was measured in the area of Milano, Italy, during the 2002 and 2003 FORMAT campaigns at three ground field sites and from an ultralight aircraft. The horizontal distributions show a stron...
