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Estimation of the 2010 Mentawai tsunami earthquake rupture process from joint inversion of teleseismic and strong ground motion data

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Geodesy and Geodynamics 2015年第3期6卷 180-186页

作者： zhang lifen Liao Wulin Li Jinggang Wang Qiuliang Key Laboratory of Earthquake Geodesy Institute of Seismology China Earthquake Administration Institute of Geophysics China Earthquake Administration Wuhan Base of Institute of Crustal Dynamics China Earthquake Administration

Joint inversion of teleseismic body-wave data and strong ground motion waveforms was applied to determine the rupture process of the 2010 Mentawai earthquake. To obtain stable solutions, smoothing and non-negative constraints were introduced. A total of 33 teleseismic stations and 5 strong ground motion stations supplied data. The teleseismic and strong ground motion data were separately windowed for 150 s and 250 s and bandpass filtered with frequencies of 0.001e1.0 Hz and 0.005e0.5 Hz, respectively. The finitefault model was established with length and width of 190 km and 70 km, and the initial seismic source parameters were set by referring to centroid moment tensor(CMT) solutions. Joint inversion results indicate that the focal mechanism of this earthquake is thrust fault type, and the strike, dip, and rake angles are generally in accordance with CMT results. The seismic moment was determined as 5.814 1020Nm(Mw7.8) and source duration was about 102 s, which is greater than those of other earthquakes of similar magnitude. The rupture nucleated near the hypocenter and then propagated along the strike direction to the northwest, with a maximum slip of 3.9 m. Large uncertainties regarding the amount of slip retrieved using different inversion methods still exist; however, the conclusion that the majority of slip occurred far from the islands at very shallow depths was found to be robust. The 2010 Mentawai earthquake was categorized as a tsunami earthquake because of the long rupture duration and the generation of a tsunami much larger than was expected for an earthquake of its magnitude.

关键词： 2010 Mentawai earthquake Rupture process Tsunami J

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Source rupture process of the 2015 Gorkha, Nepal Mw7.9 earthquake and its tectonic implications

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Geodesy and Geodynamics 2016年第2期7卷 124-131页

作者： lifen zhang Jinggang Li Wulin Liao Qiuliang Wang Institute of Geophysics China Earthquake Administration Key Laboratory of Earthquake Geodesy Institute of Seismology China Earthquake Administration

On 25 April, 2015, an Mw7.9 earthquake occurred in Nepal, which caused great economic loss and casualties. However, almost no surface ruptures were observed. Therefore, in order to interpret the phenomenon, we study the rupture process of the earthquake to seek answers. Inversion of teleseismic body-wave data is applied to estimate the rupture process of the 2015 Nepal earthquake. To obtain stable solutions, smoothing and non-negative constraints are introduced. 48 teleseismic stations with good coverage are chosen. Finite fault model is established with length and width of 195 km and 150 km, and we set the initial seismic source parameters referring to CMT solutions. Inversion results indicate that the focal mechanism of this earthquake is a thrust fault type, and the strike, dip and rake angle are in accordance with CMT results. The seismic moment is 0.9195 ×10^（21）Nm（Mw7.9）, and source duration is about 70s. The rupture nucleated near the hypocenter and then propagated along the dip direction to the southeast, and the maximum slip amounts to 5.2 m. Uncertainties on the amount of slip retrieved by different inversion methods still exist, the overall characteristics are inconsistent. The lack of shallow slip during the 2015 Gorkha earthquake implies future seismic hazard and this region should be paid more attention to.

关键词： 2015 Gorkha earthquake Rupture process Main frontal thrust fault Seismic hazard Teleseismic P wave

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Analysis on Characteristics of Precipitation Change from 1957 to 2015 in Weishan County

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Journal of Geoscience and Environment Protection 2017年第3期5卷 125-133页

作者： Ruwei zhang lifen zhang Weather Bureau of Weishan County Dali Prefecture Dali China

The climatic changes of annual precipitation, annual, seasonal, monthly and abrupt change of precipitation in Weishan County from 1957 to 2015 were calculated by using linear regression analysis, cumulative anomaly method and Morlet wavelet analysis. The results show that the annual, intertemporal, seasonal and monthly precipitation of different seasons shows a decreasing trend in different degrees. From 1960s to 1980s, the precipitation was decreasing, and the precipitation was decreasing from 1990s to 2010s. The annual precipitation decreased with the trend of linear trend of -13.0 mm/10a. The annual precipitation changed in 1969, 1974, 2003 and 2009. The cycle of annual precipitation was mainly in 8 and 32.

关键词： Interdecadal Annual Seasonal Monthly Trend Cycle Abrupt Climate Change

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An Improved CFD-synthesis Method for Predicting Inlet Dynamic Distortion

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Chinese Journal of Aeronautics 2009年第5期22卷 467-473页

作者： zhang lifen Liu Zhenxia Qu Jiyun Wang Xiaofeng School of Power and Energy Northwestern Polytechnical University Xi 'an 710072 China Chinese Flight Test Establishment Xi'an 710089 China

This article presents an improved computational fluid dynamics （CFD）-synthesis method to predict dynamic distortion. A steady-state flow field is derived from a CFD solution, through which are acquired total pressure, density, turbulence kinetic energy and others in steady-state at an aerodynamic interface plane （AIP）. Back-propagation artificial neural network （BP ANN） is used to find out the relationship between the measured flight turbulence and the CFD-computed turbulence parameters. The dynamic pressure is obtained by incorporating CFD-found total steady-state pressure with fluctuating pressure. Finally, the dynamic distortion is predicted by means of the synthesized dynamic pressure. The fairly good agreement between the computed inlet surface pressure and the flight test data bears out the reliability of CFD solution used in this article. To validate the proposed method, six sets of flight test data are used and the results show that the predicted dynamic distortion is well in line with the distortion displayed in flight tests. An examination of the traditional method is also accomplished and the comparison also shows that the proposed method is superior to the traditional one in higher consistency with flight test data.

关键词： computational fluid dynamics dynamic pressure synthesis turbulence correlation back-propagation artificial neural network dynamic distortion

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Research on the Challenges of Cold-chain Logistics and the Combination Ways with Logistics O2O Operation

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International Journal of Technology Management 2016年第6期 17-19页

作者： lifen zhang Hubei Communications Technical College Wuhan Hubei430079 China

In this paper, we conduct research on challenges of cold-chain logistics and combination ways with logistics O2O operation. Because of the cold chain logistics to the high requirement of the equipment, technology as caused the high cost of cold chain logistics. In the overall cost of China’s logistics is on the high side, under the condition of low profi t, many enterprises to enter and don’t have much interest in the field of cold chain logistics. So-called cold chain logistics is frozen food in the production, storage, transportation, sales, remain the regulations to the consumption of each link in the cold chain environment, to ensure the food quality, reduce loss of food and system engineering. Under this basis, we propose the O2O based logistics pattern that will solve the issues well.

关键词： Cold-chain Logistics Combination Ways Logistics O2O Challenges Operation

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Analysis on Characteristics of Rainfall Change in Dali Prefecture in Recent 54 Years

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Journal of Geoscience and Environment Protection 2017年第5期5卷 125-136页

作者： Ruwei zhang lifen zhang Weather Bureau of Weishan County Dali China

Through the method of Linear trend, Cumulative anomaly and Morlet wavelet, the interdecadal variation, annual, seasonal, monthly variation, abrupt change of climate and cycle of rainfall in Dali Prefecture from 1962 to 2015 were analyzed. The start date of rainy season occurred on May 8th, 2001 is the earliest;The start date of rainy season occurred on July 1st, 2015 is the latest;The average value of the start date of rainy season from 1962 to 2015 is May 31st. During the past 54 years, the annual, seasonal and monthly rainfall showed the different degrees of reduction. Linear trend analysis showed that the trend of annual rainfall was decreasing with linear trend rate of -14.02 mm/10a, the annual rainfall decreases with the number of years is not significant. Seasonal rainfall decrease with the year number is not significant. The rainfall in summer and autumn decreased with the year number. The decreasing trend of rainfall in summer is greater than that in autumn. The rainfall in Winter and Spring increased with the year number. The increasing trend of rainfall in summer is greater than that in autumn. By using the method of cumulative anomaly and Morlet wavelet, the abrupt change of annual rainfall was analyzed, and the change of annual rainfall were found in 1974, 2002 and 2008. The annual rainfall was mainly in the period of 6 and 30. On the 6a and 10a period scales, the annual rainfall from 2015 to 2019 is increasing, which predicts that Dali Prefecture is in the wet period from 2015 to 2019.

关键词： Rainfall Trend Cycle Abrupt Change of Climate

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Analysis of the relationship between water level fluctuation and seismicity in the Three Gorges Reservoir(China)

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Geodesy and Geodynamics 2017年第2期8卷 96-102页

作者： lifen zhang Jinggang Li Guichun Wei Wulin Liao Qiuliang Wang Chuanfang Xiang Key Laboratory of Earthquake Geodesy Institute of SeismologyChina Earthquake Administration Institute of Geophysics China Earthquake Administration Seismic Monitoring Station Zhaotong Seismological Bureau

The Three Gorges Reservoir is a good site for the further researches on reservoir induced seismicity due to decades＇ seismic monitoring. After the first water impounding in 2003, seismic activity becomes more frequent than that before water impoundment. In order to quantitatively study, the relationship between the water level fluctuation and earthquakes in TGR, we introduced statistical methods to attain the goal. First of all, we relocated the earthquakes in TGR region with double difference method and divided the earthquakes into 5 clusters with clustering analysis method. Secondly, to examine the impacts of water level fluctuation in different water filling stages on the seismic activity in the 5 clusters, a series of statistical analyses are applied. Pearson correlation results show that only the 175 m water level fluc- tuation has significantly positive impacts on the seismic activity in clusters I, II, III and V with correlation coefficients of 0.44, 0.38, 0.66 and 0.63. Cross-correlation analysis demonstrates that 0, ], 0 and 0 month time delay separately for the clusters I, II, III and V exists. It illustrated the influences of the water loading and pore pressure diffusion on induced earthquakes. Cointegration tests and impulse response analysis denoted that the 175 m water level only had long term and significant effects just on the seismic events in the intersection region of the Fairy Mount Fault and Nine-brook Fault. One standard deviation shock to 175 m water level increased the seismic activity in cluster V for the first 3 months, and then the negative influence was shown. After 7 months, the negative impulse response becomes stable. The long-term effect of the 175 m water impoundment also proved the important role of pore pressure diffusion in RIS with time.

关键词： Three Gorges Reservoir Reservoir-induced seismicity Water level fluctuation Cross correlation Impulse response Pore pressure diffusion

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一例肌酸缺乏综合征患儿的临床特征及遗传学分析

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中华医学遗传学杂志 2021年第7期38卷 686-689页

作者：张勇刚张丽芬周敏徐之良汉川市人民医院儿科 431600

目的探讨GAMT基因变异所致的肌酸缺乏综合征(creatine deficiency syndromes,CDS)患儿的临床表现及遗传学的特点。方法应用全外显组测序技术(whole exome sequencing,WES)对患儿进行全外显子水平变异分析,Sanger测序法对可能的变异位点... 详细信息

目的探讨GAMT基因变异所致的肌酸缺乏综合征(creatine deficiency syndromes,CDS)患儿的临床表现及遗传学的特点。方法应用全外显组测序技术(whole exome sequencing,WES)对患儿进行全外显子水平变异分析,Sanger测序法对可能的变异位点进行验证;磁共振波普(magnetic resonance spectrum,MRS)检测大脑中的肌酸水平,并复习文献总结该类疾病的特点。结果患儿临床表现为发育落后,智力低下,叫之反应差,双眼可追物。四肢肌力及肌张力均未见明显异常,动作不灵活。脑电图提示界限性儿童脑电图;MRI提示脑白质发育异常、胼胝体发育异常;尿有机酸筛查结果提示甘油三磷酸增高。高通量测序发现该患儿GAMT基因存在复合杂合变异,其中c.412C>T(***138Ser)杂合变异遗传自母亲;剪接位点变异IVS4-1G>A遗传自父亲。头颅MRS示双侧基底节区肌酸降低,提示脑肌酸缺乏。剪接位点功能验证显示变异导致GAMT基因第5外显子缺失。结论本研究发现GAMT基因两个未见报道的变异,丰富了该基因的变异谱。

关键词：肌酸缺乏综合征 GAMT基因全外显子测序临床特征

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Development, Protection and Sustainable Development of Huadianba in the Cangshan Mountain, Dali Prefecture

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Journal of Landscape Research 2013年第5期5卷 23-24页

作者： YANG Jintao zhang lifen ZHAO Tichao Dali Prefecture Meteorological Bureau Cangshan Mountain Protection and Management Bureau

Huadianba in the Cangshan Mountain, a region where key ecosystem types and species under prior protection are concentrated, is the first choice for the comprehensive protection and development of biodiversity. In this study, natural conditions, location and current protection and development of Huadianba were introduced, major problems emerging in the protection and management were summarized, and pertinent measures were proposed as a reference for the scientific development and protection of Huadianba.

关键词： Cangshan Mountain Huadianba Sustainable development Development Protection

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Dual-degradable Disulfide Containing PEI-Pluronic/DNAPolyplexes:BalancingProtection and DNARelease,and Transfection Efficiency

Dual-degradable Disulfide Containing PEI-Pluronic/DNAPolyple...

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2013年全国高分子学术论文报告会

作者： Zhenzhen Chen lifen zhang Yanfeng Li College of Chemistry and Chemical Engineering Lanzhou University

＜正＞Polymeric gene-delivery vectors to achieve lack of toxicity and a balance between protection and DNA release remains a formidable *** intracellular environment responsivedegradable bonds is an appreciable step towards developing safer transfection *** this study,novel dual-degradable,polycation copolymers（PA-PEI-SS）were firstly synthesized through the addition of low

关键词： Pluronic PEI Gene vector Dual-degradable Disulfide-containing linker

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