非均匀弹性介质地震波场伪谱法正演模拟

基于一阶速度—应力弹性波波动方程,利用傅里叶变换将空间导数变换到频率域求解,对介质波场进行正演模拟。本文结合实际勘探中可能存在的地质问题,设计了多种地质模型,包括背斜模型、向斜模型、透镜体模型和断层--侵入体模型等,进行了伪谱法地震波场正演模拟、合成地震记录的实现,并分析了其波场动力学变化特征。结果表明,应用伪谱法对复杂模型的模拟有较高的精度和可靠性,可直接用于辅助地震野外工作设计、反演解释和资料解释等工作。     

“大村庄制”合并村庄脆弱性评估——以宁夏永宁县试验区为个案

宁夏永宁县试验区内各合并村庄受到外部扰动时会表现出一定程度的脆弱性,并通过敏感性与适应力状况表达出来。基于结构方程模型原理构建合并村庄测量模型、一阶脆弱性SEM,运算处理试验区内8个合并村庄1600份有效问卷的调查数据,优化出合并村庄脆弱性评估指标,估算评估指标权重;依据优化出的脆弱性评估指标及评估指标权重构建灰色定权聚类模型,从扰动、敏感性、适应力3个维度评估合并村庄的脆弱性。结果表明:试验区内合并村庄整体上扰动效果差、敏感性较强、适应力一般。脆弱性规律为扰动效果好则敏感性弱、适应力强、脆弱性程度低,扰动效果差则敏感性较强或强、适应力一般、脆弱性程度高或较高。     

新疆探空仪器换型前后资料对比分析

选取阿勒泰、阿克苏、和田等8个台站L波段和59-701系统对比观测逐日07时和19时850～100 hPa 10个位势等压面上的高度、气温、露点温度数据,进行差值、离散程度分析,对数据进行t检验,并给出订正方程.研究发现:(1)温度差值07时阿勒泰、库尔勒、民丰等5站为正,哈密、若羌、阿克苏三站为负,正值表明L波段雷达探测的温度值大于59型的温度值,大部分台站19时的差值比07时稳定.(2)高度差值07时和19时4站为正,250 hPa以下差值在0～-10之间,250 hPa以上差值迅速增大,除个别台站外差值最大值均在100 hPa处.(3)07、19时露点温度差值除个别等压面外均为负值,且07时的差值大于19时.(4)大部分台站的高度、温度能通过信度α=0.05的检验,说明L波段与59-701雷达探空高度和气温观测资料无显著性差异.露点温度均未能通过T检验,通过计算给出订正方程.     

Tunneling analysis under the influences of Einstein–Gauss–Bonnet black holes gravity theory

We consider an equation of motion for Glashow–Weinberg–Salam model and apply the semiclassical Hamilton–Jacobi process and WKB approximation in order to compute the tunneling probability of W-bosons in the background of electromagnetic field to analyze the quantum gravity effects of charged black hole(BH) in Einstein–Gauss–Bonnet gravity theory. After this, we examine the quantum gravity influences on the generalized Lagrangian field equation. We make clear that quantum gravity effects leave the remnants on the tunneling radiation becomes non-thermal. Moreover, we analyze the graphical behavior of quantum gravity influences on corrected Hawking temperature for spin-1 particles for charged BHs.     

New class of solutions for water infiltration problems in unsaturated soils

This paper presents the results of approximate analytical solutions to Richards' equation, which governs the problem of unsaturated flow in porous media. The existing methods generally fall within the category of numerical and analytical methods, often having many restrictions for practical situations. In the present study, two approximate analytical methods known as the differential transform method (DTM) and homotopy perturbation method (HPM) were employed to find analytical solutions to Richards' equation. The methods were found to be robust in finding solutions practically identical to those from the existing analytical and numerical methods. Two representative examples were considered in order to evaluate the accuracy of the solutions obtained by DTM and HPM, revealing high level of accuracy in both cases.     

焦郑高速公路雾天气预报与监测

分析了焦郑高速公路沿线雾天气气候特征及能见度与最大车流量的关系。利用欧洲中心数值预报产品和单站要素资料，选择预报因子，建立了雾天气预报方程。利用天气雷达进行临近监测预报服务。     

Classical and quantum anisotropic wormholes in pure general relativity

In the homogeneous and isotropic Friedmann–Robertson–Walker minisuperspace model, it is known that there are no Euclidean wormhole solutions in the pure gravity system. Here it is demonstrated explicitly that in Taub cosmology, which is one of the simplest anisotropic cosmology models, wormhole solutions do exist in pure general relativity in both classical and quantum contexts. Indeed, it is realized that it is the nonvanishing momentum or the energy associated with the anisotropy change, that essentially renders the occurrence of both classical and quantum wormholes possible.     

考虑多普勒参数的SAR影像距离——共面方程及其定位

通过对合成孔径雷达（SAR）影像成像几何机理的分析,以传感器位置和姿态作为定向参数,构建了考虑多普勒参数的SAR影像距离—共面方程及基于该方程的SAR影像空中三角测量模型。以登封地区99景0.5 m分辨率机载非0多普勒SAR影像为试验数据,进行了单片定向、无控制点的自由网平差、稀少控制点的区域网平差及带有自检校参数的区域网平差等系列试验。与R-D模型相比,本文模型减少了定向参数的数目,实现了SAR影像与POS数据的联合平差处理,建立的带有自检校参数的SAR影像区域网平差模型,对提高稀少或无地面控制点条件下未进行（或低精度）几何定标SAR影像的区域网平差精度起到了显著作用。较少控制点条件下模型满足了丘陵和山区1∶5000/1∶10000航摄测图对空中三角测量精度的要求。     

基于等效误差方程的三线阵CCD影像自检校区域网平差

本文针对机载三线阵CCD影像自检校区域网平差中,待求未知参数众多、法方程巨大而复杂的问题,提出了基于等效误差方程的ADS40影像自检校区域网平差方法.通过采用虚拟误差方程对原始误差方程进行等效改化,构建ADS40影像自检校区域网平差的等效误差方程,从而消去加密点地面坐标改正数,减少平差待求参数,实现法方程的合理简化.试验证明此方法可在保证平差精度的同时,显著提高解算效率.