具脱层的正交各向异性梁-板的屈曲分析

根据非线性理论，假定脱层为贯穿梁幅的一维脱层，且脱层位置任意，建立了轴向压力作用下含脱层的正交各向异性梁－板的非线性控制方程，对结构进行了分区处理，通过使控制方程适当线性化，利用脱层前缘的连续性条件、平衡条件及相容条件，导出了夹支边界情况下的具脱层的正交各向异性梁－板关于屈曲荷载的无量纲化的特征方程，确定了临界压力荷载，并讨论了脱层尺寸及位置对临界荷载的影响。     

Soil CO2 evolution from Korean pine virgin forest at Changbai Mountain

The soil CO₂ evolution rate was measured in a virgin Korean pine forest. The results in June showed that the lowest value of evolution rate was 220 mg/(m²·h) and appeared at 6:00 a.m. The highest value was 460 mg/(m²·h) at 18:00. The rates of CO₂ evolution were related with soil temperature. On the basis of the constructed regression equation and the monthly average values of temperature, the magnitude of CO₂ evolution from Korean pine forest soil was 10.4 t/hm² during a growing season. This project was funded by the Opened Research Station of Changbai Mountain Forest Ecosystem, Chinese Academy of Sciences. Responsible editor: Zhu Hong     

直接拟设法解广义Burgers-Huxley方程

通过引进一个合适的拟设方程和直接拟设法得到广义Burgers-Huxley方程的显示精确孤波解,同时也可以通过这种方法得出广义Burgers-Huxley方程的一些特殊形式的方程。     

结构可靠度的一种计算方法

提出一种推广一次二阶矩法的算法，解决了关于相关正态随机向量的非线性极限状态方程下结构可靠度计算问题，在理论上论证了方法的可行性，实例计算表明了方法的有效性。     

低温等离子种子处理研究初报

采用低温等离子种子处理技术对大豆、玉米、番茄、甘蓝种子进行不同剂量的处理，观察对这些作物生长发育及产量的影响。结果表明，在适宜剂量处理下，4种作物产量均有所提高，最高增产效果：大豆40．76％，玉米14．4％，番茄37．3％，甘蓝22．84％。处理剂量偏高或偏低时蔬菜作物表现出明显的减产趋势，而粮食作物则表现为不增产或增产不显著     

基于投资的再保险定价模型

从系统的观点出发,把公司的赔付情况与投资收益相接合,对比例再保险与超额损失再保险,建立了在投资影响下的带跳的再保险模型,给出了基于投资的再保险定价公式,为公司厘订再保险费提供了新的方法.     

一阶具有正负系数的无界时滞微分方程解的振动性

讨论一阶具有正负系数的无界时滞微分方程,建立了方程所有解振动的一些充分条件,同时推广了相关文献中的结果.     

求解中立型常延迟微分方程再生核数值方法

在再生核空间Ｗ＾２ ２（０）中，给出在动力系统等领域广泛应用的中立型二阶常延迟微分方程组数形式的解析解表达式，当解析解级数截断时得到近似解，并分析了此近似解的特点。     

SMA在钢箱梁桥面铺装中的应用

SMA应用时必须根据具体情况对其构成进行调整。本文根据钢桥的特殊要求,对SMA在钢箱梁桥桥面铺装中的使用进行了有益的研究。     

Determining design parameters for recovery of aquaculture wastewater using sand beds

Design information for the use of sand beds to remove suspended solids from wastewater discharged from recirculating aquaculture systems (RAS) was developed. Wastewater from a commercial RAS tilapia farm with 2% total solids and 1.6% total suspended solids (TSS) was applied to sand columns to determine infiltration rates and phosphorus capture. Various hydraulic loading rates and drying periods between application events were evaluated. Infiltration rates stabilized after five application events to 3.5 cm/day (S.D.=1.7). Practically, all suspended solids were captured at the top of the columns, creating the primary resistance to infiltration. Concrete sand removed approximately 93% of the soluble phosphorous in the wastewater and wollastonite, an economical aggregate alternative to sand, removed at least 98%. A modified Darcy equation is presented to predict infiltration based upon TSS and the number of sequential applications.