迎风紧致格式与热流计算

该文在朱庆勇、马延文(1998)一文的基础上给出了利用迎风紧致格式求解NS方程.它是UCGVC格式在粘性流计算中的推广.对于方程中的无粘部分利用Steger-Warming的通量分裂技术将流通向量分裂成两部分,在此基础上据风向构造逼近于无粘项的三阶迎风紧致格式.对方程中的粘性部分采用通常的二阶中心差分格式.该文利用对Burgers方程的特征分析,研究了为正确模拟边界层内的流动特征对网格雷诺数的限制条件.通过对超声速粘性球头绕流的数值模拟表明:迎风紧致格式能在较大的网格雷诺数的条件下计算热流值,结果是令人满意的

Determination method of cobalt doped lithium manganeseoxide composition

以盐酸羟胺为还原剂,用乙二胺四乙酸(EDTA)滴定法测定掺钴锂锰氧化物中锰和钴的总量,同时用硝酸铵-硫酸亚铁铵氧化还原法测定掺钴锂锰氧化物中总锰量。两者结合可以计算掺钴锂锰氧化物中锰和钴的组成。测出的锰和钴的含量与理论值接近,其中锰的含量准确率达99%以上。因此,与其它仪器分析方法相比,如与原子吸收光谱法(AAS)相比,该方法简便、可靠,准确度高,是一种较好的测定方法。This paper studied the determination method of cobalt doped lithium manganese oxides compostion. The total content of manganese and cobalt was determined by using NH2OH·HCl as a reducing agent in EDTA coordinating titration method, and the manganese content was determined by a oxidation-reduction titration method with NH4NO3-FeSO4·(NH4)2SO4. Then, the contents of manganese and cobalt were measured more accurately than some instrumental analyses. The ratio content measured of manganese and cobalt are similar to the value we set before experiments. The method is more simple, practical and accurate than other techniques such as AAS. Therefore, this is a useful and efficient method for determination of manganese content in cathode materials of Li-ion batteries.教育部重点项目(03065,JA02159

数字微流控技术及其在生物分析中的应用

数字微流控技术是一种基于微电极阵列来实现离散液滴精确控制的新型液滴操纵技术。这种基于介电润湿现象实现的液滴电操纵体系,相比于传统微流控芯片具有自动化、可寻址、可动态配置、易集成等特点。该文介绍了数字微流控技术液滴驱动原理,总结了芯片的结构和常用的制作方法,举例阐述了现阶段该技术在生物分析化学领域的应用,并对其应用前景做了展望。国家自然科学基金资助项目(21735004,21435004,21775128,21705024,21521004);;长江学者和创新研究团队项目(IRT13036

The Application of Human Performances in Tourism Research

人类表演学是20世纪80年代正式形成的研究人们日常生活中表演性行为的学科,人类表演学理论在旅游研究中的运用几乎和自身发展同步。描述人类表演学理论在旅游研究中的运用与主要成果的基础上,探讨人类表演学理论在旅游研究中进一步发展的可能。The subject of human performances in 1980s aims to research people's daily behaviors,and its application in tourism research has happened almost simultaneously with its own development.Based on the application in tourism research and its main achievements,the paper expounds the possibility of further development in the theory research

数值求解Navier—Stokes方程的迎风紧致差分格式

从迎风紧致逼近^[1]出发，提出数值求解可压Navier-Stokes方程的一种高精度的数值方法。利用Steger-Warming的通量分裂技术^,将守恒型方程中的流通向量分裂成两部分，在此基础上据风向构造逼近于无粘项的三阶迎风紧致有限差分格式。对方程中的粘性部分采用通常的二阶差分逼近。所建立的差分格式被用来数值求解了三维粘性绕流问题

求解双曲型守恒律方程的高精度迎风紧致群速度控制法

从迎风紧致逼进出发，提出求解流体力学双曲型守恒律的一种高精度的数值方法，同时采用群速度控制方法捕捉激波。该方法在光滑区具有三阶精度

Interfacial behavior of phospholipid monolayers revealed by mesoscopic simulation

A mesoscopic model with molecular resolution is presented for dipalmitoyl phosphatidylcholine (DPPC) and pal-mitoyl oleoyl phosphatidylcholine (POPC) monolayer simulations at the air-water interface using many-body dissipative particle dynamics (MDPD). The parameterization scheme is rigorously based on reproducing the physical properties of water and alkane and the interfacial property of the phospholipid monolayer by comparison with experimental results. Using much less computing cost, these MDPD simulations yield a similar surface pressure-area isotherm as well as similar pressure-related morphologies as all-atom simulations and experiments. Moreover, the compressibility modulus, order parameter of lipid tails, and thickness of the phospholipid monolayer are quantitatively in line with the all-atom simulations and experiments. This model also captures the sensitive changes in the pressure-area isotherms of mixed DPPC/POPC monolayers with altered mixing ratios, indicating that the model is promising for applications with complex natural phospholipid monolayers. These results demonstrate a significant improvement of quantitative phospholipid monolayer simulations over previous coarse-grained models

Research on Shipping Damage Control System Based on Spatio-temporal Database

在船舶管理系统设计问题的研究中,由于船舶系统的日益复杂化,传统的损管信息管理方式难以准确掌控全船情况,导致损管资源调度低效.针对上述问题,将时空数据库技术与时空可视化技术引入船舶损管信息管理中,提出了基于二元组的适应于动态路网的损管资源调度算法,通过对船舶系统进行时空建模,采用二元组方式描述路径权值,并依据路径必须经过关键节点集合的特点,对路网进行剪枝,降低路径规划中节点访问数量.仿真结果表明,与Dijkstra算法相比,改进算法时间性能平均提高35％,有效提升了损管资源调度效率,为船舶系统安全性提供了保障.Due to the complexity of the ship,it is difficult for traditional damage control to know about the whole ship that will lead to low resource scheduling efficiency. Aiming at this problem,this paper introduced spatio-temporal database and spatio-temporal visualization technology into the solution, and proposed a resource scheduling algorithm adapted to dynamic path based on binary group. By modeling the ship, adopting the binary group to describe the weight of the path and based on the characteristic that paths must visit the collection of key nodes,the path network was pruned to reduce the number of accessed nodes. Simulation results show that compared with Dijkstra, the time efficiency of the algorithm can be improved by 35%,increasing the efficiency of resource scheduling and providing a support for security of the ship