外伤性面瘫的手术治疗

目的: 探讨外伤性面瘫适当的处理方法。方法: 对 12 例外伤性面瘫的病例施行手术治疗,损伤部位于面神经迷 路段及膝状神经节周围 3例次、水平段 6例次、垂直段 4 例次、颅内段 1 例次。经乳突、上鼓室进路 10 例,经颅中窝、乳突联合 进路2 例。结果: 术后随访半年～ 3 年。面瘫Ⅰ级恢复 7 例, Ⅱ级恢复 2 例, Ⅲ级恢复 2 例, Ⅳ级恢复 1 例。结论: 外伤性面瘫 应及早手术,乳突上鼓室进路基本上可暴露膝状神经节及迷路段远端, 但术野狭窄, 对膝状神经节减压不够完全, 且影响听 力。对于损伤膝状神经节以上部位者,应采用颅中窝、乳突进路, 并根据损伤性质,选取不同的手术方法

Genetic algorithm study on the stable structures of (C_(60))_N slusters

采用Pacheco-Ramalho相互作用势,结合改进的遗传算法研究了(C60)N团簇(N=3~25)的稳定结构与“幻数”序列,并研究了(C60)N团簇的势能变化.结果表明:团簇的稳定结构与构成团簇的C60分子数目有密切的关系.随着C60分子数目的增大,团簇的稳态结构呈现出由层状变为壳状,然后又转变为层状结构的变化趋势.随着组成C60分子数的增多,团簇中分子的平均势能呈下降的趋势,下降的幅度随着分子数的增大而越来越小.By using Pacheco-Ramalho inter-molecular potential together with the improved genetic algorithm,the stable structures,the "magic numbers" as well as the potential energies of the(C_(60))_N clusters(N=3 up to 25) have been studied.The present results show that the stable structures of the(C_(60))_N clusters are very sensitive to the number of C_(60) in the clusters.As the number of C_(60) molecules increases,the stable structure of the cluster displays a tendency forming from tier structure to shell structure,and then back to tier structure,and the averaged potential energy of C_(60) decreases gradually.国家自然科学基金(10374076);; 福建省自然科学基金(E0320001,Z0513004

Design of MRI communications and pulse generation module

针对小型化核磁共振成像仪主控板的功能需要提出新的设计方式,采用FPGA开发板作为主控板,以Nios II嵌入式软核作为协处理器,通过在其上移植μC/OS-Ⅱ操作系统及lwIP协议栈,实现与计算机的网络通信;使用Verilog硬件描述语言编写脉冲序列生成模块,实现对指令的解析以及执行,形成用户要求的脉冲序列。最终测试结果表明,主控板的通信速率以及通过示波器采集得到的脉冲序列均满足成像仪系统要求。而且这种软硬结合的设计方式与以往全软件的设计相比,使成像仪精度更高,性能更加稳定。To satisfy the require of the MRI main control board,this paper puts forwards a new design which uses FPGA development board as main control board and uses Nios II as a co-processor.We transplant theμC/OS-II operating system and protocol stack lwIP to achieve the network communication with computers.Then we use the hardware language Verilog to write pulse sequence generation module to achieve the analysis and execution of the command.Eventually it produces user's pulse sequence.Final test results show that the communication rate of the main control board and pulse sequence which is obtained by oscilloscope can satisfy the requirements of the MRI system.Compared with the past of the whole software design,this design make the MRI system higher precision and more stable.国家自然科学基金(11175149)资助项

无机热化学数据库中复氧化物高温熵的预报

标准熵的估算方法以W.M.Latimer法最为著名。本文对此作了若干修正,并成功地将它推广应用到高温情况。作为试验,本文预报了二十个复氧化物在不同温度下的熵值,其中十八个化合物的均方根偏差小于5cal/mol·K,即与若干复氧化物标准熵的实验误差相当。因此本方法可以装入“无机热化学数据库”。使它增加预报复氧化物高温熵的功能