花形氧化锌纳米粒子的制备及其光催化性能

以氯化锌和氢氧化钠为原料,水为反应介质,密闭加热的条件下制备了花形ZnO纳米粒子。借助扫描电镜及X射线粉末衍射仪等仪器,对产物的形貌、结构进行了表征;对产物的生长机理做了研究,同时研究了反应条件对产物的影响,另外对产物进行了光催化测试。结果表明,花形骨架在反应初期就已经产生,反应时间增加,花形粒子变大;改变氯化锌和氢氧化钠的物质的量比,产物形貌产生了较大变化,分别生成了另一种形貌的花形粒子和片状粒子;通过光催化测试表明,所得的产物均有良好的光催化性能。     

水煤浆管道输送模型

本文介绍了描述加压气化用水煤浆管道流动性能的数学模型－Ｍｅｔｚｎｅｒ－Ｒｅｅｄ通用计算法。在试验范围内（Ｒｅ＇＝１６．８￣１７６０），用该模型处理２８５个实验数据的平均相对误差为６．９６％，管道输送试验可评价各种水煤浆的管道流动性能并提供管道输送参数。     

Fat bloom formation and characterization in milk chocolate observed by atomic force microscopy

The surface microstructure and polymorphic behavior of milk chocolate subjected to multiple thermal cycles between 20 and 32, 33, or 34°C were examined using atomic force microscopy (AFM) and powder X-ray diffraction (XRD). The surface of unbloomed milk chocolate was smooth (surface roughness of 278 nm) and consisted of small, evenly distributed crystals. XRD results indicated the presence of mostly form V crystals and little or no form VI crystals. Cycling between 20 and 32°C resulted in little bloom formation and change in polymorphic behavior. Gradual bloom formation occurred as a result of cycling between 20 and 33°C, and was accompanied by the nascence of form VI crystals. Surface roughness increased gradually from 417 nm after one cycle to 476 and 521 nm after two and three cycles, respectively. Extensive bloom arose from cycling between 20 and 34°C. Surface roughness increased from 373 nm after one cycle to 603 and 736 nm after two and three cycles, respectively. This heavily bloomed chocolate consisted of jutting crystals and large raised, yet smooth areas that were haphazardly located within the chocolate matrix. In summary, a new perspective on the development of surface bloom due to thermal cycling is provided.     

无刷双馈电机及其调速系统的发展

通过回顾无刷双馈电机的原理、数学模型和闭环控制策略的发展情况，介绍了无刷双馈电机本体及其调速系统在国内外的发展及现状，分析了研究意义，并展望了其发展前景。     

Morphology of porous n-GaP anodically formed in different mineral acids

n-type GaP(100) was anodized in H₂SO₄, HF, HCl, HBr, HI, HNO₃ and H₃PO₄ in order to obtain porous structures. Remarkable differences in the morphology were found when anodisation was carried out under comparable electrochemical conditions. Etching in HF led to a statistically porous structure, but no evidence for higher ordering was obtained. Etching in HCl solutions caused a localized attack of the surface leading to porous insular areas. In HBr highly defined rectangular pores grow perpendicular to the (100)-surface forming several μm thick well defined porous layers. In HI pores are aligned parallel to equipotential lines along defects. Pore formation in H₃PO₄ and HNO₃ can lead to highly complex ordered structures. Clearly the work shows that the formation of porous n-GaP is strongly dependent on the anion present in the electrolyte.     

乘客等待条件下的电梯优化调度模型

对多部电梯进行综合调控管理具有广泛的现实意义,本文提出了在乘客等待条件下的电梯调度问题,以作为上班高峰期电梯优化调度的一种近似。并利用概率论的方法得到了电梯往返运行一次的平均时间,建立了电梯优化调度的数学模型,且采用动态规划的方法求得了乘客在等待条件下的最优调度方案,并对实例进行了计算。     

离子交换过程数学模型及仿真研究

根据离子交换原理建立了离子交换系统模型。并以钨离子交换为例。编写仿真软件求解该模型，获得淋洗曲线及各交换参数，通过与实验结果验证，计算机仿真数据与实验结果大致一致。     

聚氨酯基pH/温度敏感性水凝胶的结构形态

通过阴离子型端丙烯酸酯基聚氨酯(UAA)与N-异丙基丙烯酰胺(NIPAAm)的共聚交联反应,制备了pH/温度敏感性水凝胶,分析了水凝胶的结构形态及溶胀水的状态.结果表明,凝胶相结构均匀,随聚氨酯含量的降低,凝胶的骨架变得松散,并且孔道结构增大,导致溶胀凝胶中不可冻结水含量及凝胶强度的降低.     

Optimizing the results of pseudo-inverse simulation of the dynamics of space-time distributed processes

The analysis of root-mean-square simulation of the initial boundary-value problems of the dynamics of distributed-parameter systems is continued. The authors formulate and solve minimization problems for the simulation errors by optimizing observations of the initial and boundary conditions and by selecting reference points for simulation functions.Translated from Kibernetika i Sistemnyi Analiz, No. 5, pp. 45–57, September–October 2004.     

多级旋转式倒立摆的建模与分析

运用刚体的动力学知识对多级旋转式倒立摆系统进行了动力学分析,归纳其规律性,并推导出旋臂及各级摆杆的运动微分方程,从而获得任意级旋转式倒立摆的非线性数学模型。文中还对旋转式倒立摆系统进行了能控性分析。最后利用MATLAB对一级、二级旋转式倒立摆的控制进行了仿真,并得到较好的仿真结果。