三效吸收制冷循环的性能分析和优化

本文建立了使用溴化锂溶液作为工质的三种流程的三级三效吸收制冷循环模型,进行了性能比较计算,结果表明并联流程循环的性能系数ＣＯＰ最高;同时本文进一步对并联流程和串联流程的三效吸收制冷循环分别进行了关于溶液分配率和总体热交换面积分配率的优化计算,得到了不同设计工况时面积分配率与ＣＯＰ的关系,为三效吸收循环的最优设计提供了理论依据。     

Simple and indecomposable twofold cyclic triple systems from Skolem sequences

We construct simple indecomposable twofold cyclic triple systems TS₂(v) for all v ≡ 0, 1, 3, 4, 7, and 9(mod 12), where v = 4 or v ≥ 12, using Skolem‐type sequences. © 2000 John Wiley & Sons, Inc. J Combin Designs 8: 402–410, 2000     

Case studies and new results in combinatorial enumeration

A 1976 block design enumeration algorithm has been reimplemented with a number of enhancements. Its use is demonstrated with a number of case studies involving different kinds of incidence structures. New results include the enumeration of weakly union‐free twofold triple systems of orders 12 and 13, Mendelsohn triple systems of orders 10 and 12, 2‐(8, 4, 9), 2‐(10, 4, 4), 2‐(16, 4, 2), 3‐(11, 5, 4) and 4‐(12, 6, 4) block designs, and 2‐(7, 3, λ) designs for 14 ≤ λ ≤ 16. Some of these results correct enumerations previously published in the literature. Additional results confirm independently produced results, some of which have been published quite recently. © 2000 John Wiley & Sons, Inc. J Combin Designs 8: 239–260, 2000     

Mode Interaction at a Triple Zero Point of O(2) symmetric Nonlinear Systems with Two Parameters

§ 1.Introduction　Consider the nonlinear ODE with two parametersut+ g(u,λ,α) =0 (1 .1 )and its steady-state equationg(u,λ,α) =0 , (1 .2 )where g:U× R2 → U is a sufficiently smooth nonlinear mapping,and U a finitedimensional Hilbertspace.We remark thatitis easy to generalize ourresults to the casewhere g:U×R2→ V and U and V are infinite dimensional Hilbert spaces.So(1 .1 ) canbe e.g. a PDE. We assume that g is O(2 ) symmetric (equivalent,commutable) ,thatisγg(u,λ,α) =g(γu,…     

由发展算子确定的具有控制不等式约束的LQCP的最优反馈控制

研究由发展算子定义的具有控制函数积分不等式约束的线性二次控制问题（LQCP）,借助无约束线性二次控制系统推导出了最优控制的反馈形式。     

共同均值参数线性无偏估计的可容许性

本文在一特殊的共同均值模型和平方损失函数下,得到了共同均值参数β线性无偏估计Σｉ＝１＾ｍＡｉｙｉ（Σｉ＝１＾ｍＡｉ＝Ｉｎ）分别在线性估计类和齐次线性估计类中为可容许估计的充要条件。     

Generalized Steiner systems with block size three and group size g ≡ 3(mod 6)

Generalized Steiner Systems, GS(2, 3, n, g), are equivalent to maximum constant weight codes over an alphabet of size g + 1 with distance 3 and weight 3 in which each codeword has length n. We construct Generalized Steiner Triple Systems, GS(2, 3, n, g), when g ≡ 3(mod 6). © 1997 John Wiley & Sons, Inc. J Combin Designs 5:417–432, 1997     

用于压力容器破前漏(LBB)断裂分析的各种评估理论及计算精度研究

对压力容器LBB断裂分析的各种评估理论作了简要评述,并以环向贯穿裂纹的断裂评定为实例对各种评定方法的精度加以对比.指出:JR曲线稳定性评定图法是根据推动力曲线与阻力曲线的相切条件确定失效点的,理论清晰,可以作为各种评估方法的理论依据.R6的失效评定图法属近似的图解评定方法,评定结果最为保守;JR曲线映象法(RCI)是变更裂纹尺寸的失效评定图法,它能给出与JR曲线稳定性分析相同的预测,属精细的图解评定方法;最大相容应力法是通过求解综合的稳定平衡方程而确定失稳应力的,它能精细地给出裂纹撕裂扩展的全过程,比JR曲线稳定性分析方法更为简洁精确.     

Turán and Ramsey numbers in linear triple systems II

In this paper we continue our studies of Turán and Ramsey numbers in linear triple systems, defined as 3-uniform hypergraphs in which any two triples intersect in at most one vertex. In [7] the two main problems left open were the Turán number of the wicket and the Ramsey property of the sail. In this paper we present some progress towards both of these problems.