煤层中CO吸附模型

Languuir方程是由单分子层吸附模型推导出来的,在理论上,煤层吸附CO不符合单分子层吸附模型。温度较低时,由于煤层吸附CO得到的吸附等温线都属于第1类吸附等温线,所以吸附CO的量可以用Langmuir方程计算;温度较高时,吸附CO的量与煤层压力呈线性关系。煤层中CO吸附模型的确定可以提高自然发火预测预报的准确性,为进一步研究一氧化碳在煤层中的赋存机理提供了依据,减少不必要的自然发火预防措施的实施,提高经济效益,确保煤矿的安全生产。     

双曲型偏微分方程奇异摄动问题边界层方法的渐近分析

本文考虑了带小参数的双曲型偏微分方程的初值问题和初边值混合问题，建立了它们的边界层格式解法，从而避免了寻找拟合因子和加密网格时所遇到的困难。文中利用数值例子作了说明。     

An effective absorbing boundary algorithm for acoustical wave propagator

In this paper,Berenger's perfectly matched layer(PML)absorbing boundary condition for electromagnetic waves is introduced as the truncation area of the computational domain to absorb one-dimensional acoustic wave for the scheme of acoustical wave propagator(AWP).To guarantee the efficiency of the AWP algorithm,a regulated propagator matrix is derived in the PML medium.Numerical simulations of a Gaussian wave packet propagating in one-dimensional duct are carried out to illustrate the efficiency of the combination of PML and AWP.Compared with the traditional smoothing truncation windows technique of AWP,this scheme shows high computational accuracy in absorbing acoustic wave when the acoustical wave arrives at the computational edges.Optimal coefficients of the PML configurations are also discussed.     

THE EFFECTS OF ROUGHNESS CHANGE ON THE SURFACE LAYER OF THE ATMOSPHERE(Ⅰ)—THE VARIATIONS OF WIND SPEED AND SHEAR STRESS

A general four-layer structure linear theory for predicting the effects of arbitrarilydistributed roughness change on the variations of wind speed and shear stress in the surfacelayer of3D and2D atmospheres was presented.The results derived by the theory wereagreeable to the previous ones.     

准对称空间与Co或Lp（某P≥1）同构的一个充要条件

给出了Ｂａｎａｃｈ空间中的准对称基等价子Ｃｏ或ｌｐ（某ｐ≥１）中的单位向量基的一个充要条件．     

旋转磁场作用下高硅铸铁的凝固特性

借助Ｘ射线及电子探针等分析手段，对旋转磁场作用下高硅铸铁合金 Ｆｅ－２０％Ｓｉ－０．８％Ｃ的定向凝固组织特性进行了研究。结果表明，先结晶的少 量细小石墨几乎全部分离到试棒的外表面，形成２ｍｍ的富集层，而大量的 ＳＩ则形成铁硅相，且有新相ＦｅＳｉ２生成。     

杯—杆型复合挤压的材料分配规律(Ⅱ)

用“等应变分配原理”解决了杯—杆型复合挤压的材料分配问题。引入的系数λ反映了分流层内外差异因素对料料分配规律的影响。提出的分流层三种模式和选择准则与实验结果符合。     

Singularly perturbed problems with double singularity

A class of singularly perturbed initial and boundary value problems for systems of linear differential equations with singularities of various types is studied. The asymptotics of the solutions of these problems is constructed; in contrast to known results, it involves boundary layers of new types that are dependent not only on the spectrum of the limit operator. Translated fromMatematicheskie Zametki, Vol. 62, No. 4, pp. 494–501, October, 1997. Translated by N. K. Kulman     

On Causes of Biological Efficiency of Low-Intensive Millimeter Waves

The process of the ions transport through the biological membrane is considered. A role of air microbubbles efficiently mixing a near-membrane liquid layer in the presence of a temperature gradient is pointed out. These circumstances result in lowering an energy barrier height of the transmembrane ion-transport. It is shown that even low-level irradiation by the millimeter waves creates the temperature gradient, which is enough for effective mixing of near-membrane liquid's layer. It is demonstrated that a process of restoration an equilibrium air-distribution in the intercellar medium after ceasing the microwave irradiation proceeds according to the diffusion mechanism, i.e. rather slow.