具源漏的非牛顿流的渗流问题

本文研究了有源漏时的非牛顿流的一维渗流方程u_t=((f(u)_x)~m)_x+g(u)(m>1)在半无界域上的初边值问题和Cauchy问题,在始值非减的假定下得到了弱解的唯一性和存在性定理.     

三线摆测量刚体转动惯量实验的改进

对F D I M I I型新型刚体转动惯量测量仪进行了改进, 从仪器的摆角, 上下圆盘的高度, 下圆盘水平3 个方面进行改进, 用改进后的仪器对圆环的转动惯量进行测量, 从实验结果发现, 改进后的仪器可以有效地减小实 验误差     

液体表面张力系数测定仪器的改进

对FD-NST-I型液体表面张力系数测定仪进行了改进,把单金属吊环改为用绝缘体接起的入水通电吊环,把玻璃容器更换为双层变温水池,利用STM32来进行力敏传感器数据的输出和对液体温度的控制,可以有效地减小误差和更好研究温度对此液体表面张力系数的影响.     

基于MPPT控制的新型仿生学太阳树灯设计

根据仿生学原理,通过仿造树的结构制作一个树的支架,将太阳能电池板以45°的倾角放在树枝架上,然后通过WS-ALMPPT15控制器和12V/20Ah的铅酸蓄电池、负载(包括直流负载、交流负载)相连。实验测试表明:在产生电力方面,新型树灯在一天内的平均输出功率将比普通的平板太阳能电池板的输出功率输出高出27.3%;此外,新型树灯的输出电压、电流、功率基本上趋于一致,这些都高效地节约了电能。     

Effects of Al component content on optoelectronic properties of Al_xGa_(1-x)N

Using density functional theory, the electronic structures, lattice constants, formation energies, and optical properties of Al_xGa_(1-x)N are determined with Al component content x in a range from 0 to 1. As x increases, the lattice constants decrease in e-exponential form, and the band gap increases with a band bending parameter b=0.3954. The N–Al interaction force in the(0001) direction is greater than the N–Ga interaction force, while the N–Al interaction force is less than the N–Ga interaction force in the(10ī0) direction. The formation energies under different Al component content are negative and increase with Al component content increasing. The static dielectric function decreases, the absorption edge has a blue shift, and the energy loss spectrum moves to high energy with the Al component content increasing.