上部同单调随机变量和的度量

应用分布函数的反函数法和上部同单调随机向量的性质, 计算不同Young函数下Pareto分布与指数分布随机变量和的Haezendonck-Goovaerts风险度量, 得到了保单组合风险的上部同单调临界点及理赔总量的停止损失保费和Haezendonck-Goovaerts度量的表达式, 并运用R软件对Haezendonck-Goovaerts度量进行了数值模拟.     

浅析空间设计中的乘物游心

介绍了庄子乘物游心的哲学思想,论述了空间设计中的心智空间,探讨了庄子学说对空间设计的启示。     

Ultrasound-promoted Lipase-catalyzed Enantioselective Transesterification of (R,S)-Glycidol

Enantioselective transesterification of glycidol with vinyl butyrate as an acyl donor was investigated in the presence of Bacillus subtilis lipase(BSL2) as catalyst. Comparison studies demonstrate the advantage of ultrasound over the conventional shaking for the enzymatic reaction in non-aqueous media. The effects of reaction conditions(ultrasound power, temperature, water activity and pH) on the activity and enantioselectivity were also investigated. Under the optimum conditions, the synthetic activity of BSL2 was 2.95 μmol·min?1·mg?1 and the enantioselectivity(E value) was 52.2. Compared with conventional shaking, ultrasound made the synthetic activity and the enantioselectivity increase 9.5-fold and 1.4-fold, respectively. Furthermore, the repeated use of BSL2 for five cycles resulted in no obvious loss of enzyme activity, suggesting that the enzyme is stable under low power ultrasound conditions.     

Acylation of Quercetin with a Novel Thermophilic Esterase as Biocatalyst

The regioselective acylation of quercetin catalyzed by a novel thermophilic esterase(APE1547)from the archaeon Aeropyrum pernix K1 was successfully conducted in organic solvents.The effects of acyl don...     

酚类天然产物Buxifoximes A的合成及生物活性

利用商品化试剂4-羟基苯甲酰甲醛水合物(3)为起始原料,与甲氧基胺盐酸盐经一步肟化反应,以79%的收率合成了酚类天然产物Buxifoximes A(1).同时还经已知反应步骤合成了Buxifoximes A的天然类似物2.初步的抗肿瘤生物活性测试表明,二者对MV4-11细胞表现出了优秀的抑制作用,同时探讨了构效关系.     

基于矢量基学习的自适应迭代最小二乘支持向量机回归算法

为增强最小二乘支持向量机(LS-SVM)回归建模的稀疏性、鲁棒性和实时性,在加权LS-SVM的基础上,提出了基于矢量基学习的自适应迭代回归算法。在训练过程中,该算法通过矢量基学习和自适应迭代相结合的方法得到1个小的支持向量集,同时采用加权方法确定权值以减小训练样本中非高斯噪声的影响。回归学习和动态系统辩识的仿真结果表明:在回归建模精度相似的情况下,该算法确定的支持向量为全部学习样本的4.9%~8.9%,训练时间为标准LS-SVM的0.011%~0.383%;由于能够鲁棒跟踪时变非线性系统的动态特性,适合在线实时训练;可进一步用于非线性系统的建模和实时控制研究。     

基于CFD的活性炭烟气脱硫数值模拟

以移动床作为吸附装置,建立了反应器三维非稳态流动和传热的数学模型,将活性炭对烟气中SO2的吸附作为研究对象,利用CFD软件对移动床内的SO3浓度场、烟气速度场和压力场进行模拟计算,研究了烟气入口速度、烟气入口SO2浓度等因素对脱硫效率的影响。结果表明:反应器入口片脱硫效果明显,出口处脱硫效果减弱。为增大脱硫效果,应增大活性炭下移速度或降低烟气速度。     

第13届亚洲物理奥林匹克竞赛实验试题简介

第13届亚洲物理奥林匹克竞赛的2道实验试题为"摩擦系数"和"电磁感应".本文较全面地介绍了试题内容并给出了解答.     

1+1维Wolf-Villain模型奇异标度行为的数值模拟

采用Kinetic Monte Carlo(KMC)方法对描述分子束外延生长(MBE)的1+1维Wolf-Villain模型进行大尺寸和长生长时间的数值模拟研究,以消除渡越行为的影响.计算得到整体和局域标度指数.结果显示,在所模拟的空间和时间尺度范围内,1+1维Wolf-Villain模型仍呈现出固有奇异标度行为.这一结论与López等人最近的理论分析结果不一致.     

Station Model for Rail Transit System Using Cellular Automata

In this paper, we propose a new cellular automata model to simulate the railway traffic at station. Based on NaSch model, the proposed station model is composed of the main track and the siding track. Two different schemes for trains passing through station are considered. One is the scheme of ＂pass by the main track, start and stop by the siding track＂. The other is the scheme of ＂two tracks play the same role＂. We simulate the train movement using the proposed model and analyze the traffic flow at station. The simulation results demonstrate that the proposed cellular automata model can be successfully used for the simulations of railway traffic. Some characteristic behaviors of railway traffic flow can be reproduced. Moreover, the simulation values of the minimum headway are close to the theoretical values. This result demonstrates the dependability and availability of the proposed model.