黑眼菊黄色素的提取工艺及稳定性研究

以黑眼菊舌状花为原料，在常温下用５０％丙酮水溶液浸泡４ｈ，经抽滤、浓缩，得到天然的黄色素胶质。该色素用乙醇－乙醚混合溶剂冲洗后可得到较纯的黄色素粉末。黑眼菊黄色素在中性条件下对光和热均稳定，ｐＨ＜７时呈浅黄色，ｐＨ＞７时为亮黄色。淀粉和ＮａＣｌ是使黑眼菊黄色素增色的介质；蔗糖是减色介质，但随蔗糖浓度增加，减色效应迅速减弱。黑眼菊黄色素水溶液ｐＨ＝７时，在３９０ｎｍ处有一吸收峰。     

从向日葵花盘中提取果胶的研究

研究了从向日葵花盘中提取果胶的方法，以磷酸与盐酸的混合酸为萃取酸，以３价铁盐为沉淀剂，提取果胶的最高产率为１６．１％。     

钢纤维混凝土桥面铺装层的细观应力破坏分析

基于复合材料力学和线弹性断裂力学,简化了桥面铺装层及桥面板体系的力学模型,建立了修正的剪滞控制方程组.将模型裂缝区及远场的应力、位移条件合理转换为所建立计算模式的求解边界条件,进而得到了桥面铺装层和桥面板各子层的位移分布函数.运用能量法则,考虑温度效应对桥面铺装层的影响,得到了桥面铺装层破坏应力的解析解.运用该计算模式对某桥桥面铺装层的破坏进行了仿真分析,证实了该方法的适用性.     

Distributed Second-Order Continuous-Time Optimization via Adaptive Algorithm with Nonuniform Gradient Gains

Journal of Systems Science and Complexity - This paper addresses the distributed adaptive optimization problem over second-order multi-agent networks (MANs) with nonuniform gradient gains. A...     

甜菜渣中分离果胶最佳工艺条件探索

本文讨论了利用稀盐酸从甜菜渣中浸提果胶的实验条件对产率的影响。适当浓度的盐酸在适当的温度、时间下可以得到20％左右的果胶产率。     

Spiral rainband in a numerically simulated tropical cyclone

Spiral rainband is a prominent structure of tropical cyclone. Though its forming mechanism, vortex Rossby wave theory, has been widely accepted in recent years,its internal structural features are still not well known. The spiral rainband in the severe tropical storm Kammuri (2002),which caused heavy rainfall in southeast China, is simulated using the mesoscale model MM5 (V3). Results show that the simulated spiral rainband propagates azimuthally at a speed close to that of vortex Rossby wave in theory, and is accompanied with energy dispersion in the radial direction. The structural features of simulated spiral rainband are analyzed with the high-resolution model output including the full physical process. Positive vorticity, ascending motion, horizontal momentum and so on are highly concentrated in the spiral rainband. The convergent moisture of spiral rainband comes mostly from the planetary boundary layer under 1 km.Airflow from the outside of spiral rainband is convective instability, which can provide instability energy for convection development. However, the atmospheric stratification in the inside of spiral rainband is neutral, implying that the instability energy has been released. There is a mesoscale strong wind band just near the spiral rainband in the outer side with a maximum wind speed exceeding 30 m/s, which results from the pressure force acceleration when the air flows into the spiral rainband along the gradient of pressure.     

络合剂Na2H2Y在形成α-FeOOH中的作用

通过添加剂Na2H2Y碱法制备了α-FeOOH，测量了反应速度并用SEM观察了α-FeOOH颗粒的开貌，结果表明该反应对Fe^2 是零组反应，加入添加剂Na2H2Y后反应速度常数k增大。电镜观察发现Na2H2Y有α-FeOOH晶体产生枝晶的作用，当碱比R＝3.0,CNa2H2Y=0.8mmol.L^-1时制备的发晶体最佳，用它生产的γ-Fe2O3磁粉性能优良，分析实验结果认为Fe^2 的氧化反应发生在凝聚体[Fe（OH2）]m表面从而使反应对Fe^2 成零级；溶液中螯合物FeY的氧化反应改变了反应速度常数，而且因为它发生在α-FeOOH晶体的弯曲界面区域，从而减少了晶体的缺陷。     

简单树结构存储系统数据分块标准及其证明

为解决传统磁盘阵列技术受系统总线与设备通道制约的问题,采用树结构和单元控制器构建了新型的存储系统.在树结构存储系统的基础上,通过对简单树结构存储系统数据分块方式的定义、推论,以及冲突系数的证明,给出了简单树结构存储系统的数据分块标准.结果证明:简单树结构存储系统数据分块标准能最大程度降低存储系统有效冲突系数,提升存储系统性能.     

分数维环式单向耦合Lorenz系统的同步

主要采用分数维方法,基于Lalace变换,对环式单向耦合的3个Lorenz混沌系统的同步进行了研究,并对取得的结果作了相关数值模拟,模拟结果证实我们取得的成果的正确性和有效性.     

Constrained Consensus of Continuous-Time Heterogeneous Multi-Agent Networks with Nonconvex Constraints and Delays

Journal of Systems Science and Complexity - This paper studies the continuous-time constrained consensus of heterogeneous multi-agent networks with nonconvex input and velocity constraints, where...