链子崖T_（11）—T_（12）缝段危岩体开裂变形机制

文章全面描述了链子崖Ｔ（１１）—Ｔ（１２）缝段危岩体的开裂形变特征，探讨了危岩体形成的影响因素，如重力、煤层采空区、降雨、水库蓄水、勘探掘进和地震等，指出其破坏机理是重力主导下的不对称的压力拱与悬臂梁（板）弯矩的联合作用。危岩体可以分成具有不同稳定程度的若干块体，治理工程也应针对它们的不同特点而设计。     

混合法计算GB体波理论地震图

高斯射线束（GB）方法是一种用于计算不均匀介质中波场的高频近似方法。本文在详细讨论了几种用高斯射线束叠加计算理论地震图的方法--频谱法、褶积法和波包法之后,提出了适用范围更广泛的混合方法（褶积-波包法）,并给出了一个便于数值计算的褶积公式。混合法在计算GB理论地震图时既用褶积法又用波包法,可以得到较高的计算速度与精度。最后,就二维情况分别用褶积法、波包法和混合法进行了一些实际计算和比较。     

等效梁的刚度分析及应用

本文以板架为例，利用结构分析中的板单元、膜单元建立结构模型，将其计算结果与利用等效刚度梁、板单元建立的结构模型计算结果进行比较，通过分析，了解等效刚度梁在结构分析中的利弊。     

Simplified model for predicting the onset of parametric rolling

The world container fleet shows the fastest growth of any ship type. The infrastructure for loading and unloading container ships are also growing in many ports around the world. Such a trend is due to the fact that the containerized transportation is becoming more and more attractive due to many factors. The increasing demand in container transportation is met by use of more number of container ships including Post-Panamax and Malacca-max containers. Loss of containers in seas and accidents of container vessels are reported from many parts of seas. New generation containers are severely hit by parametric rolling. Pure loss of stability, due to exponential increase of roll in either broaching—to or head sea conditions, is called parametric rolling, is subjected to rigorous investigation by many researchers. Algebraic expression based on well known Duffing's method is proposed for solutions in parametric rolling. The variation in GM and damping values from trough to crest conditions associated with bow flare immersion and emergence in head sea conditions with pitch resonance with the heading waves are said to be the prime reason for parametric rolling. A simple model to predict the beginning of parametric rolling is described in this paper.     

Updated bathymetric survey of Kick-'em-Jenny submarine volcano

High-resolution bathymetric data obtained in July 1996 during a survey of the Kick-'em-Jenny submarine volcano north of Grenada in the Lesser Antilles revealed changes in the structure of the volcanic edifice compared to previously available surveys. The volcano's summit, at 178 m below sea level, was found to be approximately 18 m farther from the surface than was reported by Bouysse et al. (1988) and others. No dome was observed. Instead, an open crater, surrounded by walls that dropped significantly in elevation from one side to the opposite, suggest that eruptions, earthquakes, rockfalls or explosions may have altered the structure since the last detailed survey. The deepest contour of the volcano's crater was found 106 m below the summit.     

基于窗函数法的恒定束宽波束形成器设计

文章研究了等间距线列阵宽带恒定束宽波束形成器的实现原理。给出了利用窗函数获得实现恒定束宽所需子频带加权矩阵的方法。利用获得的加权矩阵，构建了恒定束宽频域算法模型，并通过计算机仿真验证了其有效性。     

Application of Gaussian Beam Summation Migration in Reflected In-seam Wave Imaging

The geological conditions for coal mining in China are complex, with various structural issues such as faults and collapsed columns seriously compromising the safety of coal mine production. In-seam wave exploration is an effective technique for acquiring detailed information on geological structures in coal seam working faces. However, the existing reflected in-seam wave imaging technique can no longer meet the exploration precision requirements, making it imperative to develop a new reflected in-seam wave imaging technique. This study applies the Gaussian beam summation (GBS) migration method to imaging coal seams'' reflected in-seam wave data. Firstly, with regard to the characteristics of the reflected in-seam wave data, methods such as wavefield removal and enveloped superposition are employed for the corresponding wavefield separation, wave train compression and other processing of reflected in-seam waves. Thereafter, imaging is performed using the GBS migration technique. The feasibility and effectiveness of the proposed method for reflected in-seam wave imaging are validated by conducting GBS migration tests on 3D coal-seam fault models with different dip angles and throws. By applying the method to reflected in-seam wave data for an actual coal seam working face, accurate imaging of a fault structure is obtained, thereby validating its practicality.     

护坡格构与坡面相互作用的研究

边坡防护中的锚固格构梁多采用Winkler假设计算内力,设计者通常忽略了边坡岩土体和格构之间摩擦阻力的影响。摩擦阻力对于预应力而言较小,但确实存在,在未加预应力锚固格构梁中不应忽略。本文提出了一种简单有效的计算方法,并结合工程实例,使格构梁的设计得以优化。