波浪力计算中的一个新边界元方法

本文就波浪与结构物作用问题，提出了一个新的高阶边界元方法。较之Ｅａｔｏｃｋ Ｔｏｙｌｏｒ和Ｃｈａｕ的方法，本文在体内附助积分方程中应用了满足刚性水面条件和弱刚性底面条件的简单格林函数。计算速度相应地有所提高；漂浮结构的积分方程更为简洁；计算结果与Ｅａｔｏｃｋ Ｔａｙｌｏｒ和Ｃｈａｕ的方法具有几乎相同的精度和收敛速度。     

一级轻气炮内弹道数值模拟

利用拉格朗日方法跟踪弹后工质的运动规律，采用ＶｏｎＮｅｕｍａｎｎＲｉｃｈｔｍｙｅｒ差分格式对带有坡膛，有限药室工的一级轻气炮进行了内弹道一维数值模拟，对不同的工质，在初温及相对装药量变化的情况下进行了计算，计算结果表明：（１）对同一种工质，初始装填压力ｐ０和ｗ／Ｍ相同时，初温时弹丸的相对初速ｖｇ／ｃ０和炮口压力Ｐｇ几乎没有影响；（２）对同一种工质，在Ｐ０相同时ｖｇ／ｖ０可表示成ｗ／Ｍ的函数，并随ｗ     

A study of stacking faults in deformed austenitic stainless steel by X-ray diffraction

Making use of the data obtained already in our laboratory on elongated, quenched samples of austenitic steel lCrl8Ni9, such as the effective domain size D_eff, the average dislocation density-ρ, the average dislocation configuration parameter, -M, the range of strain field -R_e, the elastic energy density 〈E/V〉,etc., some exact and clear expressions for the relation of intrinsic stack-ing fault (SF) density α′, extrinsic SF density α″, twin fault density β, SF energy γ, true particle size D₀, minimum value of the fault width T_min, and maximum particle size D_max are given.     

上犹江水电站大坝闸墩与廊道顶拱裂缝成因分析

针对江西上犹江水电站大坝闸墩裂缝和检查廊道顶拱的贯穿裂缝,运用温度场和温度应力的有限元方法对施工和运行过程进行模拟计算,在运行期重点考虑夏季泄洪冷击和冬季寒潮对开裂的影响,根据计算结果对裂缝的成因进行分析。计算结果表明,不同时期的温度应力是产生裂缝的主要原因。提出了裂缝处理和预防的建议。     

Combined-Stage Sintering Model

By focusing on the similarities between the three stages of sintering, a single equation is derived that quantifies sintering as a continuous process from beginning to end. The microstructure is characterized by two separate parameters representing geometry and scale. The dimensionless geometry parameter, denoted T, comprises five scaling factors that relate specific microstructural featuers (e.g., surface curvature) to the scale (grain diameter). Calculations of T from experimental data show (a) agreement with computer simulations of initial-stage sintering, (b) the effect of surface diffusion on T, and (c) changes in T with microstructural evolution during sintering. Application of the model to the design of firing schedules and the study of microstructural geometry effects on sintering is discussed.     

The globally Bi-3-connected property of the honeycomb rectangular torus

The honeycomb rectangular torus is an attractive alternative to existing networks such as mesh-connected networks in parallel and distributed applications because of its low network cost and well-structured connectivity. Assume that m and n are positive even integers with n ? 4. It is known that every honeycomb rectangular torus HReT(m,n) is a 3-regular bipartite graph. We prove that in any HReT(m,n), there exist three internally-disjoint spanning paths joining x and y whenever x and y belong to different partite sets. Moreover, for any pair of vertices x and y in the same partite set, there exists a vertex z in the partite set not containing x and y, such that there exist three internally-disjoint spanning paths of G-{z} joining x and y. Furthermore, for any three vertices x, y, and z of the same partite set there exist three internally-disjoint spanning paths of G-{z} joining x and y if and only if n ? 6 or m = 2.     

基于IPv6校园网的智能选课系统的J2EE架构的设计与实现

通过分析IPv6校园网自主学习模式下的自主选课问题,提出了利用J2EE技术构建基于IPv6校园网的智能选课系统的总体结构及具体实现.     

酸性染料与分散染料同浴浸染单板工艺实践

厚单板染色加工难以获得良好的透染性、均染性和较高的色牢度。采用高温高压工艺和分散性、渗透性较好的染料浸染厚单板，可以获得良好的染色效果。     

复杂形体目标激光散射特征测量系统的研制

复杂形体目标激光散射特征的测量系统中，利用反射式离轴光路满足了可见到远红外波段的测量需要，通过大孔径（250mm）物方远心接收光路实现了对实际远场的模拟测量，以光滑镀金球体作为标准器，可直接获得任意目标散射截面的绝对值。在0．6328、1．06和10．6μm三个波段针对标准器的实测结果表明，平均误差小于4．95％。     

THE APPLICATION OF COKELET''''S WAVE THEORY IN THE CALCULATION OF WAVE-CURRENT FIELD

By using Cokelet's wave theory,the limiting wave height and the relative waveangular frequency in wave-current field were calculated in this paper.It is indicated by numeri-cal calculation that if the water depth is not too small,the result given by authors'calculationare very close to the results of limiting wave height by Dalrymple(1975)and to the data of rel-ative wave angular frequency by linear wave theory;but if water depth is rather small,thereare some discrepancy,