浅议软件工程案例教学的基本思路和方法

软件工程是计算机学的一个分支学科,其应用价值和实际作用十分明显,在业界也广受瞩目。开展软件工程教学,不能单纯依靠教师的理论讲述,更多的需要实体案例的支撑,即软件工程案例教学。本文正是以软件工程案例的思路和方法为议题,对如何更好的开展此类教学,提出了自己的看法。     

Coating of LiNi1/3Mn1/3Co1/3O2 cathode materials with alumina by solid state reaction at room temperature

Alumina coated LiNi1/3Mn1/3Co1/3O2 particles were obtained by a simple method of solid state reaction at room temperature. The reaction mechanism of solid state reaction at room temperature was investigated. The structure and morphology of the coating materials were investigated by XRD, SEM and TEM. The electrochemical performances of uncoated and Al2O3-coated LiNi1/3Co1/3Mn1/3O2 cathode materials were studied within a voltage window of 3.00-4.35 V at current density of 30 mA/g. SEM, TEM and EDS analytical results indicate that the surface of LiNi1/3Mn1/3Co1/3O2 particles is coated with very fine Al2O3 composite, which leads to the improved cycle ability though a slight decrease in the first discharge capacity is observed. It is proposed that surface treatment by solid state reaction at room temperature is a simple and effective method to improve the cycle performance of LiNi1/3Co1/3Mn1/3O2 particles.     

基于小波分析的GPS接收机随机噪声研究

采用小波分析技术对GPS接收机进行检测研究,结合小波分析的基本原理,介绍了小波分析研究GPS接收机质量的方法,并通过对比分析两种GPS接收机随机噪声水平,得出了一些指导性结论,为今后潜在的GPS技术用户比较各种接收机提供了可靠评价。     

Technical optimization of LiFeP04 preparation by water quenching treatment

A technique of combination of vacuum firing and water quenching was applied to the synthesis of LiFePO4 powder. The sample was prepared by heating the pre-decomposed precursor mixtures sealed in vacuum quartz-tube, followed by water quenching at the sintering temperature. The synthetic conditions were optimized by orthogonal experiment. The results indicate that the fast quenching treatment can avoid the overgrowth of single crystal and improve its availability ratio of active material. The sintering temperature has the greatest effect on the electrochemical performance of sample. Next is the molar ratio of Li to Fe and the sintering time, respectively. The samples prepared in the optimized technical condition has the highest reversible discharge specific capacity of 149.8 mA·h/g.     

LiFePO4-LiMn2O4混合正极材料对电池性能的影响

通过微波反应合成具有亚微米尺寸的LiFePO4/C复合材料,并将LiFePO4/C和通过高温固相法合成的LiMn2O4按照一定的质量比均匀混合用作锂离子电池正极材料.电池充放电测试表明电池的循环性能随着LiFePO4量的增加逐渐变好,当LiFePO4与LiMn2O4的质量比在3∶2时电池具有较好的循环性能和较高的比功率.交流阻抗测试表明二者混合试用可以有效地降低电极过程的电荷传递电阻.最后分析了循环性能提高的原因.     

高浓度有机酸性工业废水处理站设计

采用中和一内电解－－絮凝－－厌氧－－好氧组合工艺处理高浓度有机酸性工业废不,ＣＯＤ去除率可达９５％,脱色率可达９５％,出水水质达到国家二级排放标准。     

循环流化床锅炉技术综述

简要论述了国内外循环流化床锅炉技术的发展概况,具体分析了循环流化床锅炉技术的原理及特点,并对该技术的发展前景作了展望。     

详述盐酸米诺环素脂质体的制备

目的考察盐酸米诺环索脂质体的制备工艺,测定脂质体的含量,并评价其质量。方法用薄膜分散法制备盐酸米诺环索脂质体,以包封率为指标,单因素优化制备工艺;以RP—HPLC测定盐酸米诺环索的含量。结果盐酸米诺环素脂质体最佳工艺为：药脂比1：30,PC—CH（8：1）,水化时间150rain,PBS体积10mL,PBS的pH6．5。平均包封率为76．5％士0．8％;平均粒径为103．2Ylm,PDI为0．211,Zeta电位为-16．5mV。结沦优化后的制备工艺可靠,可用于制备盐酸米诺环素脂质体。     

风电场出力随机扰动下的电网概率脆弱性评估

在风电大规模接入电力系统的发展趋势下,系统将经受更复杂的随机性影响,给系统的可靠稳定运行带来极大挑战。在综合考虑了不同规模和不同并网点的风电场随机扰动性、发电机的随机故障停运率以及负荷的随机波动的前提下,基于半不变量和Gram-Charlier级数(CGC)的输电网概率潮流方法,并结合系统的临界电压和极限传输功率,提出一种新的概率脆弱性评估方法,以此来筛选出风电场并网后电力系统的脆弱节点和脆弱支路。对所提方法在IEEE-30母线系统中通过不同规模风电场、不同接入点条件下进行仿真验证,及其与基于支路势能函数法的传统评估方法进行对比,结果证明该方法能够给出可靠有效的评估结论,有助于为进一步探索不同规模风电场并网下的电力系统脆弱性提供思路。