基于自平衡力的弹塑性动力反应分析方法

本文给出了一个基于自平衡力的弹塑性结构动力反应分析的新方法，详细叙述了方法的原理和过程，并对用改进的Ｔａｋｅｄａ滞变模型描述的梁单元框架结构给出了具体的分析方法。这个方法与传统的方法不同，在分析中不必修正结构的刚度矩阵，而代之以计算代表塑性铰变形引起的应力重分布的动力自平衡力，因而大大地节省了计算机时，最后通过算例对本文方法进行了验证。     

自调节趋势分析法

自调节趋势分析法的特点是:能自动消除局部成分对计算拟合区域成分的多项式的系数的影响,并能确定多项式的阶次,因而在地学数据处理及预测中有广泛的应用。     

Modelling the flow of self‐compacting concrete

A Lagrangian particle‐based method, smooth particle hydrodynamics (SPH), is used in this paper to model the flow of self‐compacting concretes (SCC) with or without short steel fibres. An incompressible SPH method is presented to simulate the flow of such non‐Newtonian fluids whose behaviour is described by a Bingham‐type model, in which the kink in the shear stress vs shear strain rate diagram is first appropriately smoothed out. The viscosity of the SCC is predicted from the measured viscosity of the paste using micromechanical models in which the second phase aggregates are treated as rigid spheres and the short steel fibres as slender rigid bodies. The basic equations solved in the SPH are the incompressible mass conservation and Navier–Stokes equations. The solution procedure uses prediction–correction fractional steps with the temporal velocity field integrated forward in time without enforcing incompressibility in the prediction step. The resulting temporal velocity field is then implicitly projected on to a divergence‐free space to satisfy incompressibility through a pressure Poisson equation derived from an approximate pressure projection. The results of the numerical simulation are benchmarked against actual slump tests carried out in the laboratory. The numerical results are in excellent agreement with test results, thus demonstrating the capability of SPH and a proper rheological model to predict SCC flow and mould‐filling behaviour. Copyright © 2010 John Wiley & Sons, Ltd.     

航空物探勘查金属矿产时提取弱信息的解释方法

摘 要　 结构逻辑法是一种提取航空物探局部弱信息的新的解释方法。在介绍该方法原理的 基础上‚探讨了利用这种方法提取航空物探局部弱信息的效果及其在矿产资源快速勘查评价 中的作用。     

陕甘宁盆地中部气田马五1段储层识别模型

本文应用多项式自组织方法，以１０个特征参数建立了中部气田马五１段储层气、水、干层判识的非线性网络模型，９２个已知样本的吻合率达９８．９％，为储层识别探索了又一新的方法，可供矿场参考     

地质系统的复杂性—地质科学的基本问题(Ⅰ)

笔者根据其所提出的“地质作用与时空结构是一切地质现象的本质与核心”的自然哲学理念将地质科学的学科体系划分为地球物质的成分与结构、地质作用、地质学场与地质系统的演化等四大基本领域, 它与9个重大基础地质问题以及与其相关的基础理论问题相对应(表 2).笔者将其已发表的地质科学的复杂性理论“地质作用的临界过程动力学——地质系统在混沌边缘分形生长”应用于研究9个重大基础地质问题, 着重对于其中所包含的主要基础理论问题的实质及其理论与研究方法作较深入而简要的剖析.目的是通过将地质系统的复杂性作为地质科学的基本问题的新视角对古老而常新的地质科学进行再认识, 将重大基础地质问题的研究提高到非线性科学和复杂性理论的层次, 并实现地质科学向精确科学的跨越, 取得突破性进展      

Enhalus acoroides responses to experimental shoot density reductions in Haad Chao Mai National Park,Trang Province,Thailand

The effect of self‐shading and competition for light in the seagrass Enhalus acoroides were investigated with a density reduction experiment in Haad Chao Mai National Park, Trang Province, Thailand. The study was carried out in a monospecific meadow with a natural density of 141.0 ± 8.7 shoots·m^?2. The intent was to determine the response of E. acoroides beds to loss of shoots and thinning, which often occur during typhoons and severe storm activity. Permanent quadrats were manipulated by clipping the seagrass shoots to 140, 72, 36 and 16 shoots·m^?2, to yield natural, 50%, 25% and 10% densities, respectively. Reducing shoot density in E. acoroides increased underwater light intensity below the canopy, generating increased leaf surface area and shoot weight. Seagrass leaf width, growth rate, and number of leaves per shoot also increased with greater light. The extent of flowering varied among treatments with no consistent trend. Our results demonstrate that increasing the available light to E. acoroides produces an increasing leaf size response as self‐shading in the bed is reduced.     

养殖水体营养状态及自净能力的分析

本文根据１９９７年２～１２月间对对虾 养殖水全的监测结果,应用营养指数法进行养殖水体的营养水平评价,结合自养指数对水体的自净能力进行分析。结果表明,养殖水体内具有较高的ＤＩＰ和ＣＯＤ是造成水体富营养化的主要因素。较高的Ｃｈｌ－ａ含量则是富营养化水体的表现。养殖池内水质状况同养殖周期和季节变更密切相关。养殖水体浮游值物和微生物的代谢偶联,是反映水体自净能力,保持水体稳定的基础。     

Cyclic behavior and failure mechanism of self‐centering energy dissipation braces with pre‐pressed combination disc springs

A new type of bracing system composed of friction energy dissipation devices for energy dissipation, pre‐pressed combination disc springs for self‐centering and tube members as guiding elements is developed and experimentally studied in this paper. The mechanics of this system are explained, the equations governing its hysteretic responses are outlined and large‐scale validation tests of two braces with different types of disc springs are conducted under the condition of low cyclic reversed loading. The experimental results demonstrate that the proposed bracing system exhibits a stable and repeatable flag‐shaped hysteretic response with an excellent self‐centering capability and effective energy dissipation throughout the loading protocol. Furthermore, the maximum bearing force and stiffness are predicted well by the equations governing its mechanical behavior. Fatigue and destructive test results demonstrate that the proposed bracing system can maintain stable energy dissipation and self‐centering capabilities under large deformation cyclic loading even when the tube members exceed the elastic limit and that a larger bearing capacity is achieved by the system that has disc springs without a bearing surface. Copyright © 2016 John Wiley & Sons, Ltd.     

Application of a self adaptive method to the simulation of the tidal front in the Huanghai Sea

A self adaptive three-dimensional baroclinic model is designed. A horizontal temperature gradient is used to control the grid size, which can improve computational precision in the fronts without inordinately increasing computation in the whole area. A simulation of the development and disappearance of the front in the Huanghai Sea is conducted with this model. Simulations of temperature distribution throughout the year are also conducted. The computational result agrees well with the observation.