带硬宵禁限制的动态最短费用路逆问题的讨论

通过构建时间扩张网络，将有宵禁的动态问题转化为一般静态问题，再利用解线性规划逆问题的方法来求解该最短路问题的逆问题。     

陕西二元经济结构的转化思路和转化机制

针对陕西省经济体系中存在的双重二元性结构，根据刘易斯的经典二元理论，提出“只有消除因多因素相互作用而形成的阻碍，才能顺利实现陕西二元经济转化”的思路。认为陕西二元经济结构的转化要从城乡产业结构的转化与升级着手，加快城市化进程，创新有关三农的各项制度，创建农村人力资本积累机制。     

双电极直流电弧炉磁镜线圈匝数计算解析

本文运用电磁理论导出了双电极直流电弧炉磁镜线圈磁感应强度以及匝数计算的解析式。其计算结果与实际数据基本相符,因此,解析式可用于磁镜式双电极直流电弧炉设计计算。解析式又揭示出磁镜线圈磁感应强度与匝数的变化规律。     

A novel pattern of fast calcium oscillations points to calcium and electrical activity cross-talk in rat chromaffin cells

Slow oscillations of cytosolic calcium ion concentration – – typically originate from release by intracellular stores, but in some cell types can be triggered and sustained by Ca²⁺ influx as well. In this study we simultaneously monitored changes in and in the electrical activity of the cell membrane by combining indo-1 and patch-clamp measurements in single rat chromaffin cells. By this approach we observed a novel type of spontaneous oscillations, much faster than those previously described in these cells. These oscillations are triggered and sustained by complex electrical activity (slow action potentials and spike bursts), require Ca²⁺ influx and do not involve release from intracellular stores. The possible physiological implications of this new pathway of intracellular signalling are discussed.Received 30 July 2004; received after revision 14 October 2004; accepted 1 November 2004     

用TOCA构成电流处理电路的实验研究

本文描述由TOCA构成的Rauch电路的特点,并给出其详细的实验研究结果。     

NH2自由基电子基态及激发态解离通道的静力学分析

本文利用原子分子反应静力学的基本原理,研究了NH2自由基体系的可能解离通道,得到了NH2自由基电子基态2B1及第一激发态2A1合理的解离通道。     

新型软子格

将软集与格代数相结合,给出新型软子格的新概念,得到了它的等价刻画。另外,利用软集的交和与运算,得到了新型软子格的交和与运算也是新型软子格。     

A relay selection scheme based on geometric optimum in cooperative cognitive systems over mixed channels

This paper proposes a relay selection scheme based on geometric optimum principle to maximize the cognitive link＇ s connectivity with limited interference to primary user in cooperative cognitive systems. A dual-hop cognitive relay system is considered, in which the channel impulse response follows independent non-identical distribution （i. n. d. ） each hop, such as Rician, Rayleigh and Nakagami-m distribution. Then, closed-form expressions in terms of outage probability and average bit error rate （ABER） are obtained using amplify-and-forward （AF） relaying protocol over such mixed fading channels. Furthermore, the best range of the relay is derived. Extensive simulation re- suits are conducted to verify the theoretical analysis, which is useful to the network optimal design.     

开放骨架稀土羧酸配合物的合成与结构表征

采用H2O/DMF混合溶剂热技术,选择咪唑羧酸衍生物和草酸混合配体与稀土金属铽配位合成了具有开放骨架结构的稀土咪唑羧酸配合物:[Tb(HpyimdC)(C2O4)0.5(H2O)]·(H2O)3(配合物1).X-射线单晶衍射等测试结果表明配合物1结晶在单斜晶系,C2/c空间群(No.15);草酸与稀土铽螯合配位形成一维zigzag链,再通过异位吡啶基咪唑羧酸的配位作用连接形成配合物1的三维开放骨架结构,沿y,z轴具有穿插超大孔道,客体分子位于孔道中.