|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | A shallow aftershock sequence in the north-eastern end of the Wenchuan earthquake aftershock zone显示文摘Previous studies show that mature faults are filled with fault gouge in the shallow part and thus cannot accumulate enough strain energy for earthquakes. Therefore most earthquakes are deeper than 5 km, except those events occurring on new faults or in intact rocks. From field observation, Wenchuan earthquake is found to rupture the free surface about 200 km, but the rupture may extend underground much further from teleseismic body waves inversion and aftershocks distribution. In the northeastern end of the rupture zone, deep rupture may induce stress increase near the free surface, and trigger shallow earthquakes. An Ms 5.7 aftershock occurred at Qingchuan, northeast end of Wenchuan earthquake fault on July 24, 2008, featuring thrust mechanism with a 3 km source centroid depth. The shallow focal depth is confirmed with the sPL phase recorded at station L0205. As Rayleigh wave is well only developed for source depth less than 1/5 of epicentral distance, the observed large amplitude of Rg at a distance of 15 km implied depth of 3 km or less. Dozens of aftershocks' sPL waveforms are also analyzed to confirm the source depths less than 3 km. On the other hand, no surface ruptures are found by geological survey or InSAR studies. It is strongly suggested that these aftershock sequences initiate fresh rupture in intact rocks triggered by stress increase from the deep co-seismic rupture of the Wenchuan mainshock. | Luo Yan Ni SiDao Zeng XiangFang Zheng Yong Chen QiFu Chen Yong | 2010 | Science China Earth Sciences2010，53，11： | 26 |
| 2 | Slip rate along the Lijiang-Ninglang fault zone estimated from repeating microearthquakes显示文摘Seismicity 并且沿着在 1999 和 2006 之间的 Lijiang-Ninglang 差错地区滑动率被调查,波形数据由云南数字地震网络记录了。由双差别方法的重定位的 seismicity 清楚地展出在北、南部的片断之间的不同特征。超过 76% 地震在丽江区域附近发生在差错的南部的片断。重定位的 seismicity 看起来反映学习区域的外壳的速度结构。用跨关联的分析,我们识别了显示出高波形类似的 92 件马甲和 70 根多重谱线的一个总数。大多数这些序列是非周期的,复发间隔从一些分钟变化到几百天。用在学习时期上定期发生了的二个序列,我们获得了一个差错在 ∼23 km 滑动约 5 mm/a 的率,在对的好同意地质并且表面 GPS 测量。 | LI Le CHEN QiFu NIU FengLin FU Hong LIU RuiFeng HOU YanYan | 2009 | Chinese Science Bulletin2009，54，3： | 16 |
| 3 | Site effects on earthquake ground motion based on microtremor measurements for metropolitan Beijing显示文摘A campaign of microtremor measurements was conducted in summer 2007 for assessing local site effects of seismic strong ground motion in metropolitan Beijing. Using the measurements from over 600 sites with approximately 1―2 km spacing covering the entire area inside Beijing’s 5th Beltway, we present the analysis results in the form of contours of the predominant resonant frequency, the thick- ness of the uppermost soft sediments, and the ground motion amplification factor. The microtremor- derived soft sediment thickness is generally in agreement with previous results based on much sparser borehole data, with the revealing of more short-wavelength undulations, which coincide with major geomorphological and neotectonic expressions in metropolitan Beijing. This study provides additional valuable information to the earthquake-resistant design of civil infrastructures and seismic hazard response in metropolitan Beijing. It also provides a feasible geophysical approaching to explore the 3-D structure beneath metropolitan cities. | CHEN QiFu LIU LanBo WANG WeiJun ROHRBACH Eric | 2009 | Chinese Science Bulletin2009，54，2： | 15 |
| 4 | Cd uptake in rice cultivars treated with organic acids and EDTA显示文摘A pot experiment was conducted to examine the activity of antioxidant enzymes, the content of malondialdehyde (MDA), proline and protein, and Cd uptake in different rice cultivars exposed to Cd (0, 1 and 5 mg/kg) in the presence of organic acids and ethylenediamine tetraacetic acid (EDTA). The results showed the increase in activity of dismutase (SOD), contents of proline and protein but a decline in activities of peroxidase (POD) and catalase (CAT), and MDA content for cultivars Xiushui63 and IIyou527. The resistance to Cd was higher in Xiushui63 than that in IIyou527 under the same Cd treatment. Cadmium contents in grain, straw and roots of both cultivars were markedly reduced in the presence of organic acids and EDTA. Grain Cd contents was the highest for plants treated with organic acids, followed by organic acids + 1/2EDTA, and the lowest with EDTA; Cd contents in straw and root were the lowest for plants treated with organic acids, followed by organic acids + 1/2EDTA, and the highest with EDTA treatment when exposed to Cd. | Weihong Xu Yangrui Li Jianping He Qifu Ma Xiaojing Zhang Guiqing Chen Huixian Wang Haibo Zhang | 2010 | Journal of Environmental Sciences2010，22，3： | 9 |
| 5 | Hippocampal overexpression of TREM2 ameliorates high fat diet induced cognitive impairment and modulates phenotypic polarization of the microglia显示文摘Type 2 diabetes mellitus(T2DM)and Alzheimer's disease(AD)share several common pathophysiological features.Rare variants of triggering receptor expressed on myeloid cells 2(TREM2)increase the risk of developing AD,suggesting the involvement of TREM2 and innate immunity in AD development.It is still unknown whether TREM2 is related to cognitive impairment in T2DM.Here,we investigated the effects of the hippocampal overexpression of TREM2 on cognitive in long-term high-fat diet(HFD)-fed mice.Male C57BL/6J mice were maintained on HFD for 50 weeks.TREM2 was overexpressed in the hippocampus 36 weeks after HFD feeding using adeno-associated virus vector(AAV)-mediated gene delivery.The results showed that the HFD feeding induced rapid and persistent weight gain,glucose intolerance and significant impairments in learning and memory.Compared with AAV-con,AAV-TREM2 significantly ameliorated cognitive impairment without altering body weight and glucose homeostasis in HFD mice.The overexpression of TREM2 upregulated the synaptic proteins spinophilin,PSD95 and synaptophysin,suggesting the improvement in synaptic transmission.Dendritic complexity and spine density in the CA1 region were rescued after TREM2 overexpression.Furthermore,TREM2 markedly increased the number of iba-1/Arg-1-positive microglia in the hippocampus,suppressed neuroinflammation and microglial activation.In sum,hippocampal TREM2 plays an important role in improving HFD-induced cognitive dysfunction and promoting microglial polarization towards the M2 anti-inflammatory phenotype.Our study also suggests that TREM2 might be a novel target for the intervention of obesity/diabetes-associated cognitive decline. | Min Wu Maolin Liao Rongfeng Huang Chunxiu Chen Tian Tian Hongying Wang Jiayu Li Jibin Li Yuxiang Sun Chaodong Wu Qifu Li Xiaoqiu Xiao | 2022 | Genes & Diseases2022，9，2： | 4 |
| 6 | Estimation of earthquake losses by using macroeconomic approach显示文摘Most earthquake loss studies use an inventory approach by which the predicted damages in various categories of structures and facilities in a concerned region are estimated and added together to obtain the total estimated. Such an approach requires a detailed inventory database of the structures and facilities in the region, which is not always readily available in many regions of the world. Therefore, an alternative means of estimating earthquake losses is used based on several macroeconomic indices such as the gross domestic product (GDP) and population. Based on the published earthquake loss data during 1980—1995, the relations between GDP and earthquake losses have been formulated empirically for several intensity ranges. The world’s land surface was divided into unit cells with 0.5°×0.5°in size, the GDP of each cell was apportioned based on its population and the GDP and population of the region to which it belongs. The predicted seismic loss of the cell was then estimated from the seismic | Qifu Chen Yong Chen Ling Chen Jie Liu Minfeng Li | 1999 | Chinese Science Bulletin1999，44，3： | 3 |
| 7 | Rupture of the 2004 Sumatra-Andaman earthquake inferred from direct P-wave imaging显示文摘The Sumatra-Andaman earthquake on December 26, 2004 is the first well recorded gigantic earthquake (moment magnitude MW 9.3) by modern broadband seismic and Global Positioning System networks. The rich seismic and geodetic recordings have documented unprecedented details about the earthquake rupture, coseismic and postseismic deformations. This is a report of detailed images of the rupture process using the first-arriving compressional waves recorded by the China National Digital Seismic Network (CNDSN). An improved imaging condition was employed to account for the sparse distribution of the CNDSN stations. The resulting images are consistent with the major rupture features reported by previous seismic and geodetic studies. It is found that the earthquake rupture initiated at offshore of northwestern Sumatra and propagated in the north northwest direction at a speed of 2.7 ± 0.2 km/s. The rupture continued for at least 420 s and extended about 1200-1300 km along the Andaman trough with two bursts of seismic energy. | LIU Ning CHEN QiFu NIU FengLin CHEN Yong | 2007 | Chinese Science Bulletin2007，52，14： | 3 |
| 8 | A Smart Charging Algorithm Based on a Fast Charging Station Without Energy Storage System显示文摘With the growing popularity of electric vehicles(EV),there is an urgent demand to solve the stress placed on grids caused by the irregular and frequent access of EVs.The traditional direct current(DC)fast charging station(FCS)based on a photovoltaic(PV)system can effectively alleviate the stress of the grid and carbon emission,but the high cost of the energy storage system(ESS)and the under utilization of the grid-connected interlinking converters(GIC)are not very well addressed.In this paper,the DC FCS architecture based on a PV system and ESS-free is first proposed and employed to reduce the cost.Moreover,the proposed smart charging algorithm(SCA)can fully coordinate the source/load properties of the grid and EVs to achieve the maximum power output of the PV system and high utilization rate of GICs in the absence of ESS support for FCS.SCA contains a self-regulated algorithm(SRA)for EVs and a grid-regulated algorithm(GRA)for GICs.While the DC bus voltage change caused by power fluctuations does not exceed the set threshold,SRA readjusts the charging power of each EV through the status of the charging(SOC)feedback of the EV,which can ensure the power rebalancing of the FCS.The GRA would participate in the adjustment process once the DC bus voltage is beyond the set threshold range.Under the condition of ensuring the charging power of all EVs,a GRA based on adaptive droop control can improve the utilization rate of GICs.At last,the simulation and experimental results are provided to verify the effectiveness of the proposed SCA. | Qifu Cheng Lei Chen Qiuye Sun Rui Wang Dazhong Ma Dehao Qin | 2021 | CSEE Journal of Power and Energy Systems2021，7，4： | 2 |
| 9 | Large slip rate detected at the seismogenic zone of the 2008 M_W7.9 Wenchuan earthquake显示文摘Repeating microearthquakes were identified along the edge of the rupture area of the 2008 MW7.9 Wenchuan earthquake.Slip rates at depths derived from seismic moments and recurrence intervals are found to be systematically larger than those observed at surface.This large deep slip rate may explain the odds about the occurrence of this unanticipated event.Our observations here suggested that seismic hazard could be underestimated if surface measurements alone are employed. | Qifu Chen Le Li Fenglin Niu Jinrong Su | 2011 | Earthquake Science2011，24，1： | 2 |
| 10 | Vulnerability analysis in earthquake loss estimate显示文摘 | Chen Yong Chen Qifu Chen Ling | 2001 | Natural Hazards2001，，16： | 1 |
| 11 | Vulnerability analysis in earthquake loss estimate 显示文摘 | Chen Yong Chen Qifu Chen Ling | 2001 | Natu-ral Hazards2001，23，： | 1 |
| 12 | Seismic hazard and risk analysis: a simplified approach显示文摘 | Chen Yong Chen Qifu Liu Jie | 2002 | Science Press2002，，： | 1 |
| 13 | The Expression and Anatomical Distribution of BTLA and Its Ligand HVEM in Rheumatoid Synovium显示文摘 | Yongjun Shang Guoning Guo Qifu Cui Jinlong Li Zhihua Ruan Yongwen Chen | 2012 | Inflammation2012，，3： | 1 |
| 14 | Relocation of Earthquakes in the Northeastern Tianshan Mountains Area and Improvement of Local 1-D Crustal Velocity Model显示文摘We apply three methods to relocate 599 earthquake events that occurred from August 2004 to August 2005 in the northeastern Tianshan Mountains area ( 85°30' ~ 88°30'E,43°00' ~ 44°40' N ) by using travel times recorded by regional seismic network and 10 portable seismic stations deployed around the Urumqi city. By comparing the reliability of different results,we determined a suitable location method,and an improved 1-D crustal velocity model of the study area. The uncertainty of earthquake location is significantly reduced with combined data of seismic network and portable stations. The relocated events are clearly associated with regional tectonics of the northeastern Tianshan Mountains area, and are also in agreement with the existence of active faults imaged by deep seismic reflection profile. The relocated seismicity discovers some potential traces of buried active faults,which need to be validated further. | Sun Anhui Chen Qifu Chen Yong Li Gang Zhang Zhiqiang | 2012 | Earthquake Research in China2012，26，3： | 1 |
| 15 | A simplified approach to the global seismic hazard assessment显示文摘Some earthquakes in recent years (such as Tangshan earthquake (1976, China), North Ridge earthquake (1994, USA), Kobe earthquake (1995, Japan)) did not occur in known faults;moreover, the detailed data of geology, earthquake, crust deformation, etc. needed by the fault model are very difficult to obtain in many regions of the world. A simplified method of global seismic hazard analysis is developed, based on an area source model and by using seismicity data, and the global seismic hazard map is compiled. To evaluate the effectiveness and credibility of the new method, comparison study of this map with the existing national maps has been performed, which implies that it is considerably valuable to apply this method to practical use. | Jie Liu Yong Chen Ling Chen Qifu Chen Minfeng Li | 1999 | Chinese Science Bulletin1999，44，3： | 1 |
| 16 | Multiscale Isogeometric Topology Optimization with Unified Structural Skeleton显示文摘This paper proposes a multiscale isogeometric topology optimization(ITO)method where the configuration and layout of microstructures are optimized simultaneously.At micro scale,a shape deformation method is presented to transform a prototype microstructure(PM)for obtaining a series of graded microstructures(GMs),where microstructural skeleton based on the level set framework is applied to retain more topology features and improve the connectability.For the macro scale calculation,the effective mechanical properties can be estimated by means of the numerical homogenization method.By adopting identical non-uniform rational basis splines(NURBS)as basis functions for both parameterized level set model and isogeometric calculation model,the isogeometric analysis(IGA)is integrated into the level set method,which contributes to improving the accuracy and efficiency.Numerical examples demonstrate that,the proposed method is effective in improving the performance and manufacturability. | Chen Yu Qifu Wang Chao Mei Zhaohui Xia | 2020 | Computer Modeling in Engineering & Sciences2020，，3： | 1 |
| 17 | Quick and approximate estimation of earthquake loss based on macroscopic index of exposure and population distribution 显示文摘 | CHEN Qifu CHEN Yong LIU Jie | 1997 | Natural Haz~ds1997，15，： | 1 |
| 18 | Vulnerability Analysis in Earthquake Loss Estimate显示文摘The adobes in Costa Rica have almost the same vulnerability as the old civil houses in China, which represent vulnerability in the worst case. On the other hand, the high quality buildings in Costa Rica have the same vulnerability as the reinforced concrete buildings in China due to the adoption of state-of-art techniques in design and construction, which represent the vulnerability of the best case. The macroeconomic vulnerability defined by Chen et al. falls in the middle of the two extreme cases of the inventory studied because the total macroscopic loss is the sum of losses of different types of buildings and facilities. Therefore the macroeconomic vulnerability must be greater than that of the best case and less than that of the worst. The use of macroscopic vulnerability in earthquake loss estimate is easy, simple and feasible. The vulnerability plots are preliminary in nature and should be refined with additional earthquake loss data. | Chen Yong, Chen Qifu, and Chen LingCenter for Analysis and Prediction, China Seismological Bureau, Beijing 100036, China | 1998 | Earthquake Research in China1998，12，4： | 1 |
| 19 | Vulnerability analysis in earthquake loss estimate 显示文摘 | Chen Yong Chen Qifu Chen Ling | 2001 | Natural Hazards2001，，16： | 1 |
| 20 | Quick and approximate estimation of earthquake loss based on macroscopic index of exposure and population distribution显示文摘 | Chen Qifu Chen Yong | | 0，，： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员