乌什地震台PET重力仪观测资料干扰分析

分析乌什地震台重力仪资料,总结2008-2013年影响重力仪观测数据的干扰因素,结果发现：停电和雷击会对重力仪数据造成一个台阶状干扰,使数据曲线发生畸变.     

地震安全示范社区建设标准研究

根据中国地震局的统一部署,近几年多个省份开展了地震安全示范社区建设,从加强抗震设防到应急预案编制、志愿者队伍建设、宣传教育等各个方面都不同程度地开展了工作。但现有的地震安全示范社区建设还没有统一建设和评价标准,建设水平也有较大的差距,对于推进这一工作的开展十分不利。本文通过系统的资料收集和调研,结合在大连市开展的具体实践,对地震安全示范社区建设与研究现状进行了分析,综合各省市实践经验和行业管理办法,参考安全社区建设方面的标准和管理规定,给出了地震安全社区的定义、建设标准应包含的要素及主要内容,讨论了应用前景和可能存在的问题,为今后全国范围内进一步开展此项工作提供了依据,也为制定行业标准奠定了基础。     

基于TOPSIS的GNSS数据质量评估方法研究

在当前数据质量评估指标（多路径效应、数据完整率、周跳以及信噪比等）基础上增加数据有效率指标,首次提出利用多指标综合评价方法对全球iGMAS、MGEX、IGS等观测站的GPS数据进行数据质量分析,建立了TOPSIS综合评价模型,并将该模型综合评价结果与各指标进行Pearson相关分析,综合评价结果与数据完整率和数据有效率指标呈强相关;并采用静态PPP结果与该综合评价结果进行相关分析,亦呈显著相关。     

Analysis of earthquake ground motions using an improved Hilbert–Huang transform

Some limitations of the Hilbert–Huang transform (HHT) for nonlinear and nonstationary signal processing are remarked. As an enhancement to the HHT, a time varying vector autoregressive moving average (VARMA) model based method is proposed to calculate the instantaneous frequencies of the intrinsic mode functions (IMFs) obtained from the empirical mode decomposition (EMD) of a signal. By representing the IMFs as time varying VARMA model and using the Kalman filter to estimate the time varying model parameters, the instantaneous frequencies are calculated according to the time varying parameters, then the instantaneous frequencies and the envelopes derived from the cubic spline interpolation of the maxima of IMFs are used to yield the Hilbert spectrum. The analysis of the length of day dataset and the ground motion record El Centro (1940, N–S) shows that the proposed method offers advantages in frequency resolution, and produces more physically meaningful and readable Hilbert spectrum than the original HHT method, short-time Fourier transform (STFT) and wavelet transform (WT). The analysis of the seismic response of a building during the 1994 Northridge earthquake shows that the proposed method is a powerful tool for structural damage detection, which is expected as the promising area for future research.     

Magma mingling in the Tungho area,Coastal Range of eastern Taiwan

Complex rocks, consisting of different lithologic breccias and sediments in the Tungho area of the southern Coastal Range, eastern Taiwan, were formed by magmas and magma–sediment mingling. Based on field occurrences, petrography, and mineral and rock compositions, three components including mafic magma, felsic magma, and sediments can be identified. The black breccias and white breccias were consolidated from mafic and felsic magma, respectively. Isotopic composition shows these two magmas may be from the same source. Compared to the white breccias, the black breccias show clast-supported structures, higher An values in plagioclase, higher contents of MgO, CaO, and Fe₂O₃ and lower SiO₂, greater enrichment in the light rare earth elements (LREE), and depletion in the heavy rare earth elements (HREE). The white breccias show matrix-supported blocks and mingling with tuffaceous sediments to form peperite. Physical and chemical evidence shows that the characteristics of these two components (mafic and felsic magmas) are still apparent in the mingled zone. According to their petrography, mafic and felsic magmas did not have much time for mingling. White intrusive structures and black flow structures show that mingling occurred before they solidified. Finally, the occurrence of mingling between magmas and sediments suggests that the mingling has taken place at the surface and not in the magma chamber.     

煤层处置CO2 的二元气- 固耦合数值模拟

利用不可开采煤层处置二氧化碳可以有效控制温室气体的排放量并可驱动和增加煤层气资源的开采量。二氧化碳注入煤层处置后引入一个复杂的CH4-CO2二元气体与煤体的气固耦合问题,耦合了二元气体竞争吸附、竞争扩散,气体渗流以及煤体变形过程。基于COMSOL Multiphysics建立了二元气固耦合的有限元数值模型,并应用数值模拟实验对二元气固耦合进行了机理分析。模拟结果表明,CO2注入煤层后不断驱替CH4,CH4组分明显减少;气体吸附引起的煤层膨胀量可以抵消部分有效应力引起的压缩变形,由于CH4-CO2二元气体较单一CH4引起的煤层吸附膨胀量大,二氧化碳注入煤层后可以缓解煤层的压缩变形;不同孔隙压力条件下,吸附膨胀与孔隙压力两者竞争作用引起的煤层净变形不同,而净变形也控制着煤层孔隙压力和渗流率的变化,煤层渗透整体呈现先降后升,模拟进行到4.66×107 s时煤层渗透率发生反弹。     

A Preliminary Interpretation of Near-field Observation Data of the Zhangbei Earthquake

In this paper, a preliminary data processing was made for tbe aftershock records or theZhangbei M6.2 earthquake on Jan. 10, 1998. The hypocenters of 205 earthquakes with M_L≥0.5 were located. The result shows that most aftershockS were concentrated in a more than10 km long and 5～8 km wide NE-trending beIt. The source mechanism solutions of largeraftersbocks were also calculated, from which it can be inferred that the faulted zone of themain shock is an NE-trending fault. Furthermore, the spectral analysis of P waves was made.The corner frequency is about 10 Hz.     

颅颌面外科与三维重建技术

目的 探讨电子束ＣＴ三维重建技术在颅颌面外科的适应症和应用价值。方法 采用美国Ｉｍａｔｒｏｎ公司的电子束ＣＴ（ｅｌｅｃｔｒｏｎ ｂｅａｍ ＣＴ,以下简称ＥＢＣＴ）Ｃ－１５０,对７６例严重颅颌面病人实行薄层ＣＴ容积扫描。将所获ＣＴ 象经数字接口传至加拿大ＩＳＧ公司生产的Ａｌｌｅｇｒｏ工作站进行三维重建。结果 ＥＢＣＴ成像技术能立体的、详尽和精确的显示机体组织三维解剖结构极其相互关系。其再现畸形或病体     

日本沼虾染色体及其核型的研究

于１９９２年３月在上海青县采集日本沼虾，以改进的空气干燥法研究精巢细胞染色体及核型，特别较详细地研究了减数分裂前期Ｉ染色体的行为。结果表明，日本沼虾染色体数ｎ＝５３，２ｎ＝１０４，共分为Ａ，Ｂ，Ｃ，Ｄ４个染色体组；核型组成是Ｎ＝３７Ｍ＋４ＳＴ＋１１Ｔ；初级精母细胞减数分裂前期Ｉ可分为细线期／偶线期，粗线期、双线期和终变期５个时期，双线期的二价体存在弥散阶段，减数分裂的同步率高，大多处于双线期，且双