舟山近海日本囊对虾野生群体与越冬养成群体形态性状对体重和肉重影响的比较

于舟山近海日本囊对虾(Marsupenaeus japonicus)海捕野生群体和露天池塘越冬养成群体中各随机选取150尾作为测定样本,依次测量其体重(Y1)、肉重(Y2)、体长(X1)、头胸甲长(X2)、胸宽(X3)、胸高(X4)、第二腹节长(X5)、第二腹节宽(X6)、第二腹节高(X7)、尾节长(X8)、尾节宽(X9)、尾节高(X10)、眼径(X11)、眼窝距(X12)、额剑长(X13)、额剑上缘锯齿数(X14)等16项表型性状,并采用相关分析、通径分析和偏回归分析等方法定量研究了日本囊对虾形态性状对野生海捕群体与露天越冬养成群体体重和肉重的影响效应。结果表明:(1)两实验测定群体的体重和肉重与本研究中除X14外的其它形态性状的相关系数均达到极显著水平(P0.01);(2)经通径分析,海捕野生群体被保留的形态性状与体重和肉重的复相关指数分别为0.944和0.837,露天越冬养成群体被保留的形态性状与体重和肉重的复相关指数分别为0.955和0.907,其中影响露天越冬养成群体体重和肉重的核心变量均为X1,重要变量依次为X2和X6,影响海捕野生群体体重和肉重的核心变量分别为X1和X2,重要变量均为X6;(3)经多元回归分析,得出了用于估算海捕野生群体体重和肉重的回归方程以及估算露天越冬养成群体体重和肉重的回归方程。     

SOIL–PILE–BRIDGE SEISMIC INTERACTION: KINEMATIC AND INERTIAL EFFECTS. PART I: SOFT SOIL

A substructuring method has been implemented for the seismic analysis of bridge piers founded on vertical piles and pile groups in multi-layered soil. The method reproduces semi-analytically both the kinematic and inertial soil–structure interaction, in a simple realistic way. Vertical S-wave propagation and the pile-to-pile interplay are treated with sufficient rigor, within the realm of equivalent-linear soil behaviour, while a variety of support conditions of the bridge deck on the pier can be studied with the method. Analyses are performed in both frequency and time domains, with the excitation specified at the surface of the outcropping (‘elastic’) rock. A parameter study explores the role of soil–structure interaction by elucidating, for typical bridge piers founded on soft soil, the key phenomena and parameters associated with the interplay between seismic excitation, soil profile, pile–foundation, and superstructure. Results illustrate the potential errors from ignoring: (i) the radiation damping generated from the oscillating piles, and (ii) the rotational component of motion at the head of the single pile or the pile-group cap. Results are obtained for accelerations of bridge deck and foundation points, as well as for bending moments along the piles. © 1997 by John Wiley & Sons, Ltd.     

A variational approach for vertical deformation analysis of pile group

A variational approach for the analysis of vertical deformation of pile groups is presented. The method assumes that the deformation of piles can be represented by a finite series. The method applies the principle of minimum potential energy to determine the deformation of piles. Using this method, an analytical solution for pile groups in soil modelled by the theoretical load–transfer curves can be obtained rigorously. Analysis of field tests indicates that the method can predict the performance of pile groups reasonably well.     

基于快速广义反射透射系数方法的面波群速度计算

在利用实际地震资料反演地球内部结构时,群速度往往比相速度更有意义.本文在水平层状均匀介质模型中,用快速广义反射透射系数方法（Pei,2008）计算了基阶瑞雷面波的群速度,并推导了Chen(1993) 4×4 层矩阵E的逆的解析表达式.文中用数值实验的方法合成了两个典型模型的群速度频散曲线,并与复合矩阵方法计算的结果进行了对比,结果表明本文的方法是切实可行的,与广义反射透射系数方法相比明显地提高了计算效率,尤其是在高频、层厚度大和层数多的情况下表现得更为突出.     

两个有效的基于CPK的组群密钥传输协议

基于CPK提出了两个安全的单轮组群密钥传输协议,且基于双因素认证———智能卡和口令。第一个协议使用中国剩余定理(CRT)隐蔽临时密钥,在CDH假设下可证安全;第二个协议使用秘密随机数矩阵(SRM)来组合生成临时密钥,并给出了SRM的安全更新方案。两个协议均具有较低的计算量和较高的应用价值。     

皮羌盆地新生代基性岩浆活动的年代学及其地质意义

塔里木盆地西北部卷入了西南天山新生代板内造山活动,以发育一系列北东向展布的断层和断层相关褶皱为特征,但该区新生代构造变形的原因尚存在争议。文中以皮羌盆地为例报道了新生代火成岩的地质特征和测年结果,认为构造变形是对幔源岩浆活动的浅部响应,与印度 亚洲大陆碰撞没有必然的联系。皮羌盆地出露有大量的新生代基性岩墙和4个古火山颈,岩墙群整体走向NNW和NNE,产状近于直立,侵入于新生界湖相沉积地层中。火山颈相玄武岩锆石SHRIMP U Pb定年结果为46 Ma,全岩K Ar等时线封闭年龄为(455±613) Ma,表明岩浆活动发生在始新世中期。岩浆活动时间比逆冲推覆构造启动时间(约24 Ma)早约22 Ma。按热传导模式估算,在此期间来自深部热源的热传递距离约为25 km。假定深部热源为底侵或内侵幔源岩浆,新生代岩浆活动可能是塔里木盆地西北部大规模构造变形的触发机制。     

区域空间功能分区的目标、进展与方法

本文主要回顾了我国功能区划的发展历程,指出已有区划在解决新问题时存在的不足。提出进行以可持续发展为目标的区域空间功能分区,其目标是充分协调利用和保护区域空间多功能性即其社会功能、经济功能、生态环境功能等。区域空间功能分区分为三个步骤:针对不同地区关键领域的功能识别与确定、区域空间功能发展目标导向确定和区域空间发展工具确定。区域空间具有多项功能,区域多种功能的识别和定量以及主体功能的选择可采用区域空间功能函数群方法,区域空间功能分区的整个流程可用决策树方法将区域空间功能分区结果表达在空间上形成一系列主题功能区图谱。     

The Study on the Group Delay Jumping of CE-4 VLBI System

The phase delay software is a key component of VLBI (Very Long Baseline Interferometry) orbit determination system in CE-4 mission, which is critical to deep space exploration. When processing X-band DOR (Differential One-way Ranging) signals of probes in the past, the group delay jumping occasionally occurred in the observed scan. This paper consists of two parts. First, according to the VLBI station signal reception and VLBI center data processing steps, we analyzed the frequency, phase, power, and self-correlation spectrum of the signal, and located the influencing factor at the abnormal analog signal of Kunming (KM) station. Second, the group delay jumping was revised by the post-correction method, which was based on the analysis of the abnormal unwrap phase. We used the corrected phase to get the new group delay, and used orbit determination software to verify the effectiveness of the post-correction method, which upgraded the phase delay processing software.     

基于AutoCAD的大比例尺数字化地形图缩编方法探讨

大比例尺数字化地形图在城镇建设中起着重要的作用,而传统地形图缩编技术效率较低。本文以泰宁县1∶500数字化地形图缩编1∶2000地形图为例,充分利用AutoCAD平台的二次开发和共同特征选取功能,采用半自动和手动相结合的方法,大大提高了缩编效率,为大比例尺地形图缩编提供了一种新的思路。     

乌鲁木齐西山逆断层组的新活动特征

通过大比例尺的地质地貌填图工作获得了乌鲁木齐西山逆断层组的几何学特征、新活动和运动速率等相关的定量资料。西山逆断层组由5条长度十几～30余千米、近乎平行的次级断层组成,总体走向NEE,分布在南北宽约6.5km的条带范围内。该断层组南侧的两条断层属于晚更新世活动断层,北侧3条全新世以来仍有活动,其新活动具有分组和组合破裂的特征。西山逆断层组以向南的逆冲运动为主,地表形成了一系列阶地断错、挤压鼓包和断塞塘等新活动现象。根据对断层运动量的测量及年代学测定,获得该断层组中更新世晚期以来所造成的南北向地壳缩短速率为1.0～1.5mm/a,晚更新世晚期以来南北向地壳缩短速率为0.22mm/a左右。