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A study on segmentation characteristics of aftershock source parameters of Wenchuan M8.0 earthquake in 2008
2008年汶川8.0级地震序列震源参数分段特征的研究

HUA Wei,CHEN Zhang-Li,ZHENG Si-Hua,
华卫

地球物理学报 , 2009,
Abstract: 本文利用四川省区域固定地震台网观测记录到的2008年汶川8.0级地震序列的资料,从中挑选部分台站和地震资料,在精确扣除了余震区地震波衰减与台站场地响应后,计算得到了汶川地震序列中1070次ML≥3.0级地震的震源参数,结果显示,地震矩与震级之间有较好的线性关系,应力降和视应力的大小与震级大小有关.利用ML3.0级地震资料得到的应力降的时空演变过程研究结果表明,汶川余震序列地震应力降总体上随时间是一个衰减过程,预示着主震发生后整个余震区应力降呈逐渐衰减的状态.主震发生之后,以虎牙-北川-安县为界,空间上龙门山断裂带上地震活动水平和应力降具有明显的分段性.5月17日之前ML≥5.0余震主要集中在龙门山断裂带北川以西,由于地震释放了较多应力,该地区应力降较低,而北川至青川之间地震活动水平相对较弱,应力降一直处于高值水平.5月17日之后,ML≥5.0余震活动主体地区则转移到北川至青川之间,在该段发生了5月25日青川6.4级最大余震,在这之后,整个余震序列应力降随时间变化开始趋于平稳.
A Novel Culture Algorithm for Knowledge Integration
Si-hua CHEN
Journal of Computers , 2012, DOI: 10.4304/jcp.7.5.1080-1086
Abstract: From different subjects and multiple sources, knowledge integration can get an efficient knowledge base which is the key to improve the quality of decision making and enhance the core competitiveness of organizations. knowledge integration Algorithm is proposed in the framework of cultural strategy, unity of knowledge encoded by the believe space and population space and establish mechanisms for communication between two spaces to generate an effective, concise knowledge base . Experiments show that, compared to the traditional genetic algorithm, the model will be more accurate classification of knowledge, reduce redundancy, eliminate contradictory knowledge.
Imaging crustal heterogeneity in Jiashi strong earthquake swarm region by coda envelope inversion analysis
利用尾波包络线反演方法研究伽师强震群区地壳的非均匀结构

YAsano,AHasegawa,WANG Qin-Cai,YAsano,YAsano,ZHENG Si-Hua,AHasegawa,
王勤彩

地球物理学报 , 2009,
Abstract: 以单次散射模型、球形辐射源、一维线性速度模型为基础计算理论包络线,通过尾波归一化方法把理论与观测包络线结合起来形成非线性方程组,用迭代最小乘方法反演伽师强震群区的散射系数空间分布.结果表明,伽师强震群区下方中上地壳中存在明显的非均匀结构.在10~25 km各深度图像上,研究区中部都存在-低散射系数区,这个低散射系数区在10 km、15 km深度被高散射系数区包围,在20 km深度仅其东侧存在高散射系数区.1997年的7次Ms≥6.0级地震发生在研究区中部的低散射系数区内或低散射系数区向高散射系数区过渡带的低散射系数一侧.
Moment inversion of moderate earthquakes and the locally perturbed stress field in the Jiashi source region
伽师震源区中等强度地震矩张量反演及其应力场特征

ZHAO Cui-Ping,CHEN Zhang-Li,ZHENG Si-Hua,ZHANG Zhi-Qiang,
赵翠萍

地球物理学报 , 2008,
Abstract: 使用区域数字地震台站记录的宽频带长周期波形资料,在时间域反演了1997~2004年伽师震源区52次中等强度地震的矩张量.反演结果揭示,在小尺度的伽师震源区内,震源机制解的P轴、T轴和N轴呈现出明显的分区特征.本文进一步把伽师震源区分为东区和西区,分别反演了东区与西区的应力场.应力场反演结果表明,东区的应力场主压应力轴走向为321°,基本水平.最大主张应力走向68°,倾角40°.截至2004年7月,伽师震源区西部的应力场一直较为稳定,最大主压应力方向为12°,最大主张应力方向282°,二者都基本水平,中等主应力轴基本直立.自西向东,伽师震源区最大主压应力轴逆时针旋转了49°,并且西区张应力的水平作用较为显著,东区压应力的水平作用显著.应力场的这种非均匀变化特征与GPS观测得到的地壳运动速率的空间分布以及塔里木盆地边界附近的地形地貌特征有很好的一致性.震源区深部结构的陡变以及位于震源区东部边界规模较大的NW走向的普昌断裂和色力布亚隐伏断裂可能对产生这种横向非均匀的局部应力场起了重要的作用.
Preparation and Characterization of Nano-films of TiO2 Based on Ultrasonic Atomization Technology
基于超声波雾化技术的 TiO2纳米膜制备及表征

ZHANG Jia-Qi,ZHENG Si-Hua,HUANG Ji-Tao,
张嘉琪
,郑嗣华,黄积涛

无机材料学报 , 2006,
Abstract: The nano-films of TiO2 were prepared by using ultrasonic atomization technology. The films were characterized by the absorption of UV spectrum. Their surfaces were viewed by the scanning electronic microscope (SEM) and the X-ray diffraction. The hydrophilic effect of the films was determined. The influence of the frequency of ultrasonic atomization on the nano-films of TiO2 was discussed. The analytic results show that the resulting products are a nano-film of TiO2 as uniformed crystal of anatase with the particle diameter of 20~80nm. After heated or irradiated by UV radiation, the two films become super-hydrophilic materials.
Fine structure of P-wave velocity variations underneath the Central Pacific from PKP waves recorded at the China Seismic Network (CSN)
利用中国地震台网(CSN)记录到的PKP波研究中太平洋下地幔底部的小尺度P波速度变化

ZHENG Si-Hua,SUN Xin-Lei,SONG Xiao-Dong,
郑斯华
,孙新蕾,宋晓东

地球物理学报 , 2007,
Abstract: PKP震相包含了下地幔底部P波速度结构的重要信息.中国地震台网(CSN)台站记录到的南美洲地震的PKP波的射线,对中太平洋下的D"层有很好的采样.本研究采用这些PKP波的AB和DF两个分支的走时差,研究了中太平洋下地幔底部P波速度的小尺度变化.AB-DF的走时差减小了上地幔横向不均匀性的影响,而对下地幔底部P波速度的横向变化十分敏感.与此同时,AB-DF的走时差也减小了地震定位误差的影响,消除地震发震时间测定误差的影响.本研究的结果表明,在中太平洋的地幔底部存在着大范围的AB-DF走时正残差,也即低速异常区,这可能是太平洋下超大地幔热柱的源处.观测到的P波速度异常的空间分布总体上与Grand通过层析成像得到的CMB的S波的速度异常相一致,并在变化的幅度上很好地相关,P波速度的扰动值(在D"层大约为2%)是Grand速度模型中的S波异常的36%.这一结果有助于太平洋下超大地幔热柱的结构和性质的进一步研究.
On the change of industrial economy and trend of knowledgezation and ecologilization of modern industrial structure
论产业经济的变革及现代产业结构的知识化与生态化趋势

LIU Si-Hua,
刘思华

中国生态农业学报 , 2001,
Abstract: 以新修梯田7年长期肥料定位试验为依据,研究了不同施肥条件下谷子各部位生物量、养分携出量、养分平衡以及耕层土壤养分时空变化.结果表明,有机肥与N、P肥配合施用可提高谷子的籽粒产量和生物产量.养分携出量的大小顺序为籽粒>叶>糠秕>茎,为同类地区农业生产及生态环境建设提供科学依据.
Study on some problems of eco-agricultural construction
生态农业建设的若干问题研究

LIU Si-Hua,
刘思华

中国生态农业学报 , 2001,
Abstract: The importance and urgency of strengthening eco-agricultural construction are analyzed in the new century.Objectives, tasks, claims, modes of management, and industrial forms of eco-agricultural development are stated also.Ecoenvironmental and eco-agricultural construction on a large scale, enhancement of foundation status of agriculture and eco-agricultural construction, establishment of ecological county strategy and eco-agricultural development strategy must coordinately develop to strengthen eco-agricultural construction. System, technique, ecology must be organically unified to construct Chinese eco-agricultural development models and develop a coordinate way of agricultural modernization,ecologilization,knowledgezation and sustainable development.
New Perspectives on How to Discover Drugs from Herbal Medicines: CAM's Outstanding Contribution to Modern Therapeutics
Si-Yuan Pan,Shu-Feng Zhou,Si-Hua Gao,Zhi-Ling Yu
Evidence-Based Complementary and Alternative Medicine , 2013, DOI: 10.1155/2013/627375
Abstract:
Photoacoustic angiography for mouse brain cortex using near-infrared light
利用近红外光激发的光声血管造影成像

Yang Si-Hua,Yin Guang-Zhi,
杨思华
,阴广志

物理学报 , 2009,
Abstract: Photoacoustic imaging is a novel noninvasive imaging technique of biological tissue that overcomes the overwhelming scattering of light in biological tissue by utilizing ultrasonic wave to translate the image signal. In this study, near-infrared light and indocyanine green as an optical contrast agent were used to achieve the cerebrovascular distribution by photoacoustic imaging. Near-infrared light penetrates deep into the brain tissues through the skin and skull, and the indocyanine green enhances the photoacoustic signals of the blood vessels. A photoacoustic angiography of vascular distribution in the mouse brain in vivo was acquired that matches the anatomical photograph well. The experimental result demonstrates the photoacoustic imaging with near-infrared light and optical contrast agent has the potential for functional and molecular biomedical imaging.
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