Effect of ZnF2 Coating on Performance of LiNi0.5Mn1.5O4 Cathode Material for Lithium-ion Batteries

采用溶胶-凝胶法制备了LiNi0.5Mn1.5O4正极材料，并利用Zn F2对其表面进行包覆改性。XRD、SEM和TEM测试表明，包覆处理不影响材料的晶体结构，2%(质量分数，以LiNi0.5Mn1.5O4质量计，下同)的Zn F2在LiNi0.5Mn1.5O4表面形成了约7 nm厚均匀包覆层。对未包覆的LiNi0.5Mn1.5O4和1%、2%、3%的Zn F2包覆后的LiNi0.5Mn1.5O4的电化学性能进行了考察，发现Zn F2包覆能够减弱电解液与LiNi0.5Mn1.5O4正极材料之间的相互作用，稳定电极表面，提高材料的电化学性能。其中，2%Zn F2包覆样品表现出最佳的循环性能和倍率性能，0.2C电流倍率下循环200圈后，其放电比容量维持在109.0 m A·h/g，保持率为79.7%；5 C电流倍率下循环500圈后，放电比容量维持在94.2 m A·h/g，保持率为85.6%

Parameters' algorithm of semisoft shrinkage based on wavelet transforms

小波域阈值滤波因其实现最简单,计算量最小而得到广泛的应用,但对不同信号而言,其阈值函数的选择将直接影响到滤波效果。由gAOHOngyE提出的半软阈值法,因其参数实现算法的复杂度大而没有得到有效的应用。结合小波理论与模糊理论对半软阈值函数的参数提出一种新的计算算法,大大减少了算法实现的复杂度,并对其进行试验仿真,取得了良好的效果。The waveshrink has been widely used in the filtering because of the simplest realization and the smallest amount of computation.According to the different signals,the filtering effect will be directly affected by the choice of shrinkage function.The semisoft shrinkage proposed by Gao HongYe has not been effectively applied because of the complexity of the parameters’ algorithm.In this paper,a new calculation algorithm of semisoft shrinkage function is proposed through combining wavelet theory with fuzzy theory,and it can greatly simplify the complexity of the algorithm.And also the experimental simulation shows that it has obtained the good results.国家985工程中的重点项目(No.0000-X07204

Research on photovoltaic performance of Cu2ZnSnS4 and fabrication by solution chemical method

Cu2ZnSnS4（CZTS） is pr oved to be one of the ideal photoabsortion materials in the field of thin film solar cells,owning to its abundant resources,environment friendly,fascinating optoelectronic properties and so on.The crystal structure and photovoltaic

全参数全约束优化对钢筋混凝土框架结构设计的造价分析

目前的优化设计一般是将参数简化为一维问题或多维问题,或为全参数优化设计,但约束条件不够充分.针对这些不足,本文建立了更全面的符合工程设计的全参数全约束优化设计模型,利用MATLAB中的fmincon函数进行寻优计算,它可以同各种结构设计软件链接进行参数优化,如本文算例采用了中国建筑设计研究院开发的PKPM软件中已有的内力计算功能.最后,通过算例将各参数对造价影响程度进行分析比较,得出了定性及定量的结论,优化后的结构造价降低显著.与当前的钢筋混凝土框架结构优化设计相比,本文具有较强的实用性、寻优计算快捷等优点

Research on method of non-Bayesian filtering based on wavelet

对近几年来小波域滤波方法的研究现状与新发展进行归纳总结。一方面从算法思想,原理和优缺点等角度对近年来所提出的较有代表性的小波滤波算法进行分析概括;另一方面选择一些典型的滤波算法和一些常用的信号,主要从信噪比(Snr)和均方误差(MSE)两个方面进行实验,并分别就同一种滤波算法,不同的信号以及同一个信号,不同的滤波算法的滤波情况进行对比分析。最后通过结合上述分析给出小波滤波的研究热点、难点、不足和有待解决的一些问题。This paper summarizes the research and development of the wavelet filtering method in recent years.On the one hand,it summarizes the recent and representative wavelet filtering algorithms from the ideology,principles,advantages,disadvantages,and other aspects of algorithms.On the other hand,some typical filtering algorithms and some common signals are selected to the experimental result mainly from the Signal-to-Noise Ratio(SNR) and the Mean Square Error(MSE).And the effects of different filtering algorithms are compared and analyzed separately from a filter algorithm with different signals and a signal with different filtering algorithms.Finally,the hot,the difficulty,the deficiency and other issues unresolved of wavelet filtering are proposed through the combination of the above analysis.国家985工程重点项目No.0000-X0720

雷帕霉素对血管平滑肌细胞增殖影响的实验研究

【目的】观察雷帕霉素（rapamycin）对体外培养的大鼠胸主动脉平滑肌细胞（SMC）增殖的作用。【方法】组织贴块法体外原代培养大鼠胸主动脉平滑肌细胞，取对数生长期细胞（第6-10代）用作实验，MTr法检测不同浓度雷帕霉素对平滑肌细胞增殖的效果，并用RT-PCR法检测其对平滑肌细胞增殖细胞核抗原（proliferating cell nuclear antigen，PCNA）mRNA表达情况的影响。【结果】①MTT法检测显示雷帕霉素呈剂量依赖性抑制体外培养的大鼠平滑肌细胞增殖，各组吸光值似）分别为：对照组0．902±0．106；0．1ng／mL组0．873±0．079；1ng／mL组0．797±0．046；10ng／mL组0．692±0．061；100ng／mL组0．624±0．075。方差分析差异有显著性。F=28．85，P〈0．001；两两比较1ng／mL以上浓度组与对照组间差异均有显著性，不同浓度间差异显著。0．1ng/mL组与对照组相比差异无显著性。②RT-PCR显示雷帕霉素以浓度依赖模式抑制大鼠平滑肌细胞PCNA-mRNA合成。各组校正后光密度值分别为：对照组219．35±7．20；0．1ng／mL组212．39±6．56；1ng/mL组113．15±10．09；10ng／mL组97．17±12．25；100ng／mL组84．38±8．66。方差分析F=195．49，P〈0．001。两两比较与MTT检测相同。【结论】雷帕霉素呈剂量依赖性显著抑制大鼠平滑肌细胞的增殖，1ng／mL时即可明显起效。雷帕霉素有望成为治疗内支架术后再狭窄的理想药物之一

A Parallel Algorithm for Fresnel Tomography

摘要:与射线层析成像相比, Fresnel 层析成像考虑波频率的影响, 具有较高的分辨率,但所需的存储 空间和计算量更大,因此提出了Fresnel 层析成像的并行算法1 把大型层析反演方程组的求解,转化成 对其中的各个方程进行相互独立的计算,避免了大型系数矩阵的存储问题;把一个Fresnel 带的正演和 反演计算放在一个进程,不同Fresnel 带的计算相互独立进行,不需要信息传递,达到了极高的并行度; 从进程之间没有通信, 仅当从进程计算结束后,在主进程与各从进程之间有少量的数据传递,使通信开 销达到了极小的程度1 应用MPI 在Linux PC 集群环境下实现了该算法,实际测试表明,该算法具有较 高的并行度和加速比.Abstract 　In cont rast with ray2based t raveltime tomography , Fresnel tomography account s for the band2 limited nature of seismic waves and gives the higher resolution tomograms1 Because Fresnel tomography demands much computer memory and much running time , a parallel algorithm for it is proposed1 The tomographic inversion is t ransformed to resolving respectively a series of single equation in light of backprojection principle , each equation corresponding to a Fresnel zone1 The forward and inverse computation concerning a Fresnel zone is allocated to one process and is independent of other processes1 Then the storage and calculation of the large2scale mat rix in the tomography are avoided1 No message delivers between the slave processes , and only a little of data delivers between a master process and the slave ones1 By using the portable message passing interface standard (MPI ) for the communication , the computing code of the algorithm is implemented on Linux system , which allows to dist ribute the work on several PCs connected via standard Ethernet in an in2house network , and greatly expands the applicability of Fresnel tomography1 The test s on the synthetic and observed seismic t ravel time data show that this parallel algorithm has a good performance on Linux PCs1基金项目:国家自然科学基金项目(40774065) ;福建省自然科学基金项目(2006J0044

经下腔静脉肝内穿刺介入操作的临床应用

【目的】探讨经下腔静脉(IVC)肝内穿刺介入操作, 包括肝静脉造影、第二肝门重建术(RSHH)和直接肝内门腔 分流术(DIPS)的临床应用。【方法】回顾性分析11 例经IVC 肝内穿刺介入操作, 评价临床疗效。【结果】11 例成功行经IVC 内穿刺操作, ①经IVC 肝内穿刺肝静脉造影及第二肝门重建术:其中7 例行第二肝门重建术, 术后门脉高压症状明显改善5 例, 轻度改善2 例;1 例IVC 阻塞症状轻度改善;4 例消化道出血患者中, 3 例术后8 个月～ 3 年均再无发生, 1 例术后1 个月再 发急性出血;另2 例只行肝静脉造影;②直接肝内门腔分流术:共2 例, 术后门脉高压症状均明显改善, 分别于术后2 年及4 年 内未发生消化道出血。【结论】①经IVC 肝内穿刺肝静脉造影可准确评价肝静脉和门静脉系统血流动力学状况;②经IVC 途 径的第二肝门重建术穿刺安全, 成功率高。重建通道效果明确, 术后狭窄少;③DIPS 优点是穿刺安全简便, 分流效果好。保护 正常肝静脉, 减少胆道损伤, 术后狭窄少