JUnit在单元测试中的应用

单元测试在软件开发过程中起着非常重要的作用。JUnit是一个用于Java单元测试的开放源代码的测试框架,本文通过具体案例,介绍应用JUnit进行自动化测试的方法。     

基于云计算的营销决策支持系统

设计并实施了一种基于云计算的营销决策支持系统,和其他管理决策子系统发生交互,共同构成了完整的现代企业经营决策支持系统.系统的数据库采用分布式设计,使得系统既有独立处理本地数据库的能力,也可读取异地数据库中的数据.系统模型库包含多种营销因素的决策模型,并采用模型组合的思想,将复杂的决策问题通过模型之间的组合来实现.在流程设计上充分考虑人机交互,将用户的经验判断纳入到决策过程中.完成了系统的开发,并用仿真数据进行了系统测试,结果表明系统基本运行稳定,各子模块衔接良好,与其他子系统实现了数据共享.     

工业设计专业基础设计教学思考与探索

基础设计课程是工业设计专业从基础课程过渡到产品设计课程之间的桥梁,采用理论与实践相结合以实践教学为主的教学方法,理论环节以实例讲授为主,实践环节主要是专题设计训练,培养学生的观察、感受和把握的能力,着重于从纯粹的无目的的形态构成到实际产品设计的过渡,系统地训练产品设计的创意思维方法。在学习过程中运用基础课程的原理与方法,通过手工制作出有实用功能、形式美感兼备的产品雏形。     

利用SHELL编程实现UNIX系统下气象资料传输与处理

本文对UNIX环境下SHELL脚本语言进行了简要介绍,并举例说明了如何利用SHELL脚本语言实现UNIX/Linux系统下气象资料传输与处理。     

~(123)I的制备及其快速标记

本文报道了在原子能研究所1.2米回旋加速器上用26MeV的α粒子流轰击天然丰度的锑靶,通过~(121)Sb(α,2n)~(123)I反应,以铜基铂吸附剂对碘选择性吸附法分离和浓集~(123)I,制得Na~(123)I溶液。Na~(123)I的放化纯度大于99％。在辐照结束时,其主要放射性杂质~(124)I占产品~(123)I的比率小于1.4％,整个分离过程不到4小时即可完成,总的化学收率在95％以上。所得产品用冠醚为溶剂,对肾上腺显影剂6-碘甲基-19-去甲胆固醇以及心脏显影剂ω-~(123)I-十七烷酸进行了快速标记。结果表明,与国内外现用的标记方法相比较,该法具有快速、简便、产额高等优点。     

The aeroelastic effects on the scatter phenomenon of wind-tunnel data

The unsteady Reynolds-averaged Navier-Stokes equations coupled with the k SST turbulence model are solved to obtain the steady and unsteady aerodynamic forces for airfoils and wings.The effects of vibration types and amplitudes on aerodynamic forces of airfoils and wings are studied.The deformation characteristics of a swept wing induced by steady aerodynamic load are presented.It is found that for a vibrating elastic wing at small and medium incidences,its mean aerodynamic loads are almost the same as those obtained from the static one.On the contrary,at high incidences especially around the stall incidence,the vibration may change the mean values.In addition,the larger amplitude is,the larger discrepancy will be.For a swept wing,the steady aerodynamic loads usually lead to the "pitching down" effect on the wing tip which delays the stall compared with a rigid one;But this phenomenon dose not occur on a aeroelastic wing which can induce the separation ahead and trigger the stall.The above conclusions are in good agreement with the scatter characteristics of wind-tunnel data.The reason why the data obtained from wind tunnel and CFD are different is also analyzed.Meanwhile,it can be an explanation for scatter phenomenon of wind-tunnel data,especially for high incidence cases,which remains a puzzle so far.     

Experimental study of hypervapotron under conditions of high heat flux

In the light of the needs to develop high-performance heat transfer component for nation-level large-scale scientific projects of China,a hypervapotron experimental platform with supply of heat flux 1 10 MW m-2 was established.With this platform,the multiphase flow and heat transfer phenomena on the surface of triangular fin when the subcooled water flowed through were observed and measured with the planar laser induced fluorescence(PLIF) and high-speed photography techniques.The temperature contour on the slice plane of fin symmetry was measured and the heat flux contour was processed based on gradient computation.It is confirmed that:1) PLIF with high-speed photography is very powerful technique to investigate the multiphase flow of hypervapotron quantitatively;2) evaporation is the primary way in heat transfer mechanism of hypervapotron flow under the condition of high heat flux.The techniques and results obtained will provide useful reference in the R&D of hypervapotron technology in China.     

一类Holling Ⅲ型Leslie-Gower模型的持久性与灭绝性

讨论了一类食饵具有Holling Ⅲ功能反应的Leslie-Gower模型的动力学行为,应用脉冲微分方程的比较原理及其现代分析方法,得到了系统灭绝和永久持久性的阈值条件,推广了只有一次脉冲和没有功能性反应时的情形.     

Bi2WO6粉体光催化剂的制备方法及研究进展

光催化技术因其在环境污染净化、能源再生方面的应用前景而引起了广泛关注,新型光催化剂钨酸铋因其具有可见光催化活性成为了光化学领域的研究热点之一．作者简述了Bi2WO6粉体光催化剂的结构及光催化性,详细介绍了一些Bi2WO6粉体的制备方法,总结了Bi2WO6粉体光催化剂今后的研究方向与热点,可为有关人员提供参考．     

凝析气藏相态参数实验研究

油气藏流体主要有烃类成分组成,在油藏及地面条件下,这种烃类混合物的物理性质取决于其化学成分及给定的温度和压力。对于烃类的相态特征及流体组分研究在油气田开发中具有重要的意义,尤其是凝析气藏田。对海榆和10井的研究,归纳总结其流体PVT性质,为其开发提供科学依据。