化瘀止痛散的薄层鉴别研究

按照新的药品注册管理办法要求,研究了化瘀止痛散的薄层鉴别方法.通过实验考察了供试品前处理工艺、筛选薄层鉴别的色谱条件,建立了化瘀止痛散中血竭、冰片、三七的薄层色谱方法.实验结果表明:该方法简便,专属性强,重现性好,可用于化瘀止痛散的定性质量控制.     

数据处理和建模方法在数学建模教学中的应用

现代决策离不开数据,以详尽的数据来证明自己的观点,最能起到令人信服的作用,依靠相关的数据来制定政策也最为科学。数据处理和数据建模方法在数学建模教学中有着举足轻重的作用。依照应用型本科教育的人才培养模式,把数学建模思想融入数学类课程的教学。分析和总结了几种数据处理和数据建模的方法,并给出了实际应用案例。     

决定晶体硅太阳电池工作状态的独立参量的确定

从晶体硅太阳电池功率全微分方程出发,结合开路电压和功率随温度、日照变化的实验事实,研究 影响晶体硅太阳电池工作状态的各参量的独立性。从数学上确定出其独立变量为日照强度、电池温度和负载, 并得出了串联内阻是温度的函数的结论。串联内阻的实验数据验证了理论分析结果的正确性。     

Response of air gap and slamming loadings on semi-submersible platform

The present research deals with the numerical prediction of the air gap within the 6th generation of deep- water drilling floating semi-submersible platform and the experimental studies on the slamming loadings onto the structure. The survivability of the floating model with a mooring system was tested under extreme wave of 10-year return period. In the numerical simulation of the Gaussian method, the narrow band model was applied to obtain the first-order wave surface equation and the modified second-order wave surface equation. The hydrodynamic re- sponses of the floating body, i.e. radiation damping, added mass, second-order wave excitation force and drifting force, were computed by using the potential flow theory based on higher order boundary element method in fre- quent domain. In the experimental analysis, high-frequency sensors were installed at the lower deck to measure the wave slamming loads. Equivalent truncated mooring system was applied to make sure position of the floating body in the wave tank. The comparison between the numerical and experimental results showed the numerical model un- derestimated the air gap of the floating body. Nevertheless, the predictions of the high risk spots underneath the floating deck that is prone to wave slamming obtained from both models were agreeable to each other. The experi- mental results also revealed that the wave slamming events often occurred at the connection point between the rear columns and the lower deck.     

1960--2011年沣河流域气候变化特征

根据沣河流域1960--2011年气温、降水、风等地面气象观测资料,主要采用HeinfichWalter的气候状态图、距平、线性方程和极值I型概率分布等分析方法,对流域内的生态气候特征进行了分析,并推断出30年一遇和50年一遇日最大降水量的极值．结果表明：沣河流域20世纪90年代中期以来,人类活动等生态应力对气候的扰动作用明显高于全球平均水平;近52年流域内降水量、暴雨和大风日数的月际变化均呈双峰型分布,年暴雨日数21世纪以来有明显增多趋势,年大风日数80年代以后有明显减少趋势;同时通过极值I型分布推算分析得到流域上中、下游30年一遏和50年一遇日最大降水量分别是97．0mm、89．7mm和107．2mm、99．3mm,与实际降水量基本吻合．拟合良好．     

有限状态多期模型下的最小κ熵等价鞅测度期权定价

本文用一个纯跳的随机过程来描述标的资产价格的动态性,称为有限状态多期模型。考虑只有一个标的资产的期权定价模型,给出其最小κ熵等价鞅测度,在此基础上采用Monte Carlo模拟欧式期权定价MCMEM(κ)方法,分别以虚拟Black-Scholes世界中欧式期权价格和现实金融市场中的麦当劳股票期权价格为例,对MCMEM(κ)和Black-Scholes公式等其他定价方法进行比较,验证了MCMEM(κ)的可行性。     

Effects of the precipitation of stabilizers on the mechanism of grain fracturing in a zirconia metering nozzle

The mechanism of grain fracturing in a zirconia metering nozzle used in the continuous casting process was studied. The phase composition, microstructure, and chemical composition of the residual samples were studied using an X-ray fluorescence analyzer, scanning electron microscope, and electron probe. Results revealed that the composition, structure, and mineral phase of the original layer, transition layer, and affected layer of the metering nozzle differed because of stabilizer precipitation and steel slag permeation. The stabilizer MgO formed low-melting phases with steel slag and impure SiO₂ on the boundaries (pores) of zirconia grains; consequently, grain fracturing occurred and accelerated damage to the metering nozzle was observed.     

基于加权极限学习机的肿瘤基因表达谱数据分类

基因表达谱数据一般来源于临床试验,而在临床试验中,试验样本的类分布情况是不确定的,这就使得表达谱数据往往具有比较明显的不平衡性.采用加权极限学习机来对不平衡基因表达谱数据进行分类,为了减少因为不平衡数据引起的分类误差,一个临时的权重被分配给每一个样本以增强少样本类的影响,同时减少多样本类的影响,进而提高肿瘤分类的准确率.实验结果表明,所提方法能够提高少样本类的识别率,从而提高分类器的总体性能.     

智能组卷系统的建模与算法研究

根据教育考试理论与统计学,分析了自动组卷目标要求,建立了智能组卷系统的数学模型.提出了一种基于免疫遗传算法的智能组卷算法,提出了分段编码、段内遗传操作、误差加权适应度评估方法.通过应用实例分析,实验结果表明所提出新组卷算法的组卷成功率高、组卷速度快.     

基于自组装二氧化钛空穴阻挡层的高效钙钛矿太阳能电池

器件兼容功能层的自组装工艺是一种简单、可行和节能的策略。在介孔钙钛矿太阳能电池(perovskite solar cells, PSCs)中,致密的TiO₂膜起到空穴阻挡层的作用,而介孔的TiO₂膜起到电子传输层的作用。然而,这两层通常都要通过高温退火法获得。在此,我们通过室温自组装工艺沉积了致密的TiO₂薄膜,以作为PSCs有效的空穴阻挡层。通过沉积时间控制致密TiO₂薄膜的厚度。优化致密TiO₂薄膜的厚度(80 nm),有无空穴传输层的介孔PSCs的能量转化效率分别为17.95%和10.66%。值得注意的是,基于自组装TiO₂的全低温PSCs显示出16.41%的能量转化效率。