大岩淌滑坡滑带土蠕变性质研究

通过对大岩淌滑坡滑带土在固结压力为300,500,625,800,1 000 kPa下进行蠕变试验,得到了各级压力和剪切力的蠕变曲线。采用Burger模型来模拟流变过程,介绍了该模型参数的求取方法,并得到了模型的所有参数。通过等时曲线簇确定该滑带土的长期强度。在上述结果基础上,对该滑带土的流变特性进行了分析,讨论了Burger参数同剪切力与固结压力关系,并得出长期强度约为慢剪结果的0.76～0.77倍的结论。     

软土e-p曲线确定的简化方法及在非线性沉降计算中的应用

首先假设软土的压缩曲线符合双曲线方程,并通过某工程一系列的数据进行验证,验证结果表明双曲线假定比较符合软土压缩曲线;由于双曲线方程参数相对较少,数据拟合确定比较简单易行,可对实际工程软土地基沉降进行简化计算并能满足工程的精度要求;同时还针对目前地质报告一般不提供详细的孔隙比-压缩应力（简称e-p）试验数据的情况,对e-p双曲线方程提出了一个只采用初始孔隙比e0、压缩模量Es来确定其参数的简化方法。在此基础上,基于e-p曲线确定邓肯-张模型的切线模量Et,采用分层总和法应用于软土地基的非线性沉降计算。对计算结果与实测数据进行比较分析表明,所提出的方法是切实可行的。     

Three‐dimensional VS profiling using microtremors in Kushiro,Japan

A practical method is presented for determining three‐dimensional S‐wave velocity (V_S) profile from microtremor measurements. Frequency–wave number (f–k) spectral analyses of microtremor array records are combined, for this purpose, with microtremor horizontal‐to‐vertical (H/V) spectral ratio techniques. To demonstrate the effectiveness of the proposed method, microtremor measurements using arrays of sensors were conducted at six sites in the city of Kushiro, Japan. The spectral analyses of the array records yield dispersion characteristics of Rayleigh waves and H/V spectra of surface waves, and joint inversion of these data results in V_S profiles down to bedrock at the sites. Conventional microtremor measurements were performed at 230 stations within Kushiro city, resulting in the H/V spectra within the city. Three‐dimensional V_S structure is then estimated from inversion of the H/V spectra with the V_S values determined from the microtremor array data. This reveals three‐dimensional V_S profile of Kushiro city, together with an unknown hidden valley that crosses the central part of the city. The estimated V_S profile is consistent with available velocity logs and results of subsequent borings, indicating the effectiveness of the proposed method. Copyright © 2008 John Wiley & Sons, Ltd.     

硫酸盐侵蚀环境下水泥土的力学行为研究

针对含硫酸盐介质的环境水服役条件,通过室内模拟试验手段,研究了不同配合比参数和不同条件下水泥土的无侧限强度、弹性模量以及应力-应变的变化规律,分析了硫酸盐侵蚀环境下水泥土力学性能的劣化机理。结果表明,配合比参数以及环境条件对水泥土的无侧限抗压强度、弹性模量、应力-应变曲线有显著的影响;硫酸盐溶液中的水、硫酸根离子与水泥土之间的复杂物理、化学作用,影响水泥土内部微细观结构,从而对水泥土的力学性能存在显著劣化作用;且这种侵蚀作用在90d龄期内最为显著。     

Studies on primary productivity model in shallow mixed waters

ＳｔｕｄｉｅｓｏｎｐｒｉｍａｒｙｐｒｏｄｕｃｔｉｖｉｔｙｍｏｄｅｌｉｎｓｈａｌｌｏｗｍｉｘｅｄｗａｔｅｒｓＭａｏＸｉｎｇｈｕａ,ＺｈｕＭｉｎｇｙｕａｎ,ＹａｎｇＸｉａｏｌｏｎｇ,ＨａｏＹａｗｅｉ,ＪｏｈｎＣｕｌｌｅｎ（ＲｅｃｅｉｖｅｄＯｃｔｏｂｅｒ２...     

Blazars天体的多波段的理论研究

在收集大量资料的基础上,较为全面的综述了Ｂｌａｚａｒｓ天体的基本观测特征,给出了目前较为完整的ＢＬＬａｃ天体总表。对该类天体的相关理论,多波段相关性,光变周期分析,Ｈｕｂｂｌｅ关系,ＢＬＬａｃ天体的偏振度的变化作了一定研究。并介绍了我们用ＣＣＤ测光和光谱对３Ｃ３４５作准同时性观测的结果,我们讨论了３Ｃ３４５的历史光变曲线和光变周期分析,研究结果表明：３Ｃ３４５具有（１０±０．８）ａ（年）的光变周期,其中心有一个１０６Ｍ⊙的黑洞。Ｊｕｒｋｅｖｉｃｈ方法是一种Ｂｌａｚａｒｓ天体的光变周期分析研究的好方法     

The close binary system SU Ind

Photometric data on the southern mid‐F type close eclipsing binary system SU Ind from the Carter Observatory (NZ) were examined, together with a light curve obtained from the Hipparcos Epoch Photometry (HEP) database. The system appears detached, although appreciably evolved from the Zero Age Main Sequence. The HEP period must be accurate for its own epoch, but it is significantly different from the reference (Hoffmeister 1956) value. This is difficult to explain, given the uncomplicated nature of the light curve. The apparent discrepancy can be reconciled with a period that has remained almost constant over the 40 year interval between the epochs by assuming some confusion between the almost equal depth minima. The near‐equality of components raises issues of determinacy in light curve analysis, which are reviewed against the presentation of relevant numerical curve‐fitting details. The system is of physical interest, in that it is close to the start of the ‘active’ range of spectral types. Its stars have relatively rapid rotation speeds and probably shallow convective subphotospheric layers. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)     

三疣梭子蟹(Portunus trituberculatus)CTL基因SNP位点E4-205 C/T与抗溶藻弧菌相关性分析

C-型凝集素(C-typelectin,CTL)是甲壳类动物体液免疫中重要的免疫因子之一。但CTL基因在溶藻弧菌对三疣梭子蟹(Portunustrituberculatus)感染的过程中的表达及抗病机制尚有待进一步研究。为初步阐明CTL基因SNP E4-205 C/T位点与抗溶藻弧菌感染相关的分子机制,对不同基因型梭子蟹进行溶藻弧菌感染,通过绝对定量方法分析不同基因型梭子蟹肝胰腺、肌肉组织中溶藻弧菌的复制情况。发现溶藻弧菌感染后12 h内梭子蟹肝胰腺、肌肉组织中C/C组细菌数量显著高于T/T组,结果表明T/T组梭子蟹抗感染能力显著高于C/C组。进一步对该位点非同义突变(ACT-ATT)导致的一个氨基酸改变(Thr-Ile)的两种蛋白进行体外重组表达,并对两种重组蛋白CTL-ATT及CTL-ACT进行活性分析。发现两种重组蛋白对溶藻弧菌生长均具有一定的抑制作用, CTL-ATT的抑菌活性显著高于CTL-ACT。重组蛋白CTL-ATT与PAMPs的结合活性高于CTL-ACT与PAMPs的结合活性,同时两种蛋白与PAMPs和溶藻弧菌的结合活性具有浓度依赖性。结果表明三疣梭子蟹CTL基因参与机...     

基于经验频率曲线的湖泊富营养化随机评价方法及其验证

本文提出了基于经验频率曲线的湖泊富营养化随机评价方法.该法通过建立水体富营养化评价标准中各项水质指标和评价级别的经验频率曲线,推求实际水体各项水质指标的经验频率,并采用加权平均法推求湖泊富营养化评价级别的经验频率,从而得出湖泊富营养化的评价级别,具有方法简单、图形直观、计算工作量小的特点.经全国30个湖库湖泊实测水质资料的验证,随机评价方法与模糊评价方法和灰色评价方法的计算精度相当.     

紧致的Hilbert曲线Gray码索引算法

Hilbert曲线具有良好的聚簇性,使其成为设计全球立体网格多维数据索引的重要工具。但当数据集在不同维度上的分布密度存在较大差异时,常规Hilbert曲线索引会出现大量的冗余。对此,本文基于Gray码推导分析了Hilbert曲线索引的构造特点,进而设计实现了紧致Hilbert曲线索引算法,在保持Hilbert曲线良好聚簇性的同时,避免了数据维度分布差异带来的索引冗余问题。试验结果表明,相比常规Hilbert索引,紧致Hilbert曲线索引计算复杂度相当,在实例数据测试中编码耗时减少约40%,索引存储空间减少约46%,排序速度约为Hilbert排序的4.3倍。