喷嘴入射角对微型燃气轮机燃烧室性能影响的数值模拟

为了从结构方面改善Capstone C30微型燃气轮机燃烧室性能,选用预混燃料喷嘴入射角分别为25°、30°、35°、40°、45°来研究燃烧室的流场、温度场、NO_x生成分布。通过Fluent数值模拟软件,采用Standardk-ε双方程模型来封闭求解N-S方程,有限速率/涡耗散模型模拟燃烧化学反应,热力型和快速型NO_x模拟燃烧生成的NO_x,SIMPLE算法进行流场计算。结果表明:在入口条件不变的情况下,随着入射角不断变大,回流区尺寸不断增加,有利于稳定燃烧,流场分布更为合理,而出口温度不均匀系数和NO_x排放浓度震荡变化,综合分析,当入射角为45°时是最佳入射角,NO_x排放浓度和出口温度不均匀系数均有大幅改善。     

具奇异的非Newton渗流方程整体解存在性和渐进性

研究了一类奇异的非Newton多方渗流方程整体解存在性和渐进性，通过引进低能量函数的概念，证明了当初值uo(x)具有低能量时，其相应的解是整体存在的，且当t→∝时具有指数增长。     

国有企业非资源配置低效率的人力资本产权因素分析

国有企业非资源配置低效率的根本原因是由产权性质导致的国有企业治理结构的内在缺陷.本文从人力资本产权角度分析了国有企业委托结构链和刚性契约对非资源配置效率的影响,提出国有企业应建立人力资本产权与非人力资本产权共同参与企业经营控制和收益绩效分享的激励约束机制.     

Spin-current pump in silicene

We report a theoretical study of pumped spin currents in a silicene-based pump device, where two time-dependent staggered potentials are introduced through the perpendicular electric fields and a magnetic insulator is considered in between the two pumping potentials to magnetize the Dirac electrons. It is shown that giant spin currents can be generated in the pump device because the pumping can be optimal for each transport mode, the pumping current is quantized. By controlling the relevant parameters of the device, both pure spin currents and fully spin-polarized currents can be obtained.Our results may shed a new light on the generation of pumped spin currents in Dirac-electron systems.     

卵形弹垂直侵彻混凝土介质的量纲分析

针对卵形弹侵彻半无限厚混凝土介质,采用量纲分析的方法建立了相关参数的无量纲化的函数关系,通过质量为2.85kg,弹径为50.8mm的卵形弹垂直侵彻混凝土实验确定撞击混凝土侵深的工程表达式.     

Spin-polarized transport in a normal/ferromagnetic/normal zigzag graphene nanoribbon junction

We investigate the spin-dependent electron transport in single and double normal/ferromagnetic/normal zigzag graphene nanoribbon (NG/FG/NG) junctions.The ferromagnetism in the FG region originates from the spontaneous magnetization of the zigzag graphene nanoribbon.It is shown that when the zigzag-chain number of the ribbon is even and only a single transverse mode is actived,the single NG/FG/NG junction can act as a spin polarizer and/or a spin analyzer because of the valley selection rule and the spin-exchange field in the FG,while the double NG/FG/NG/FG/NG junction exhibits a quantum switching effect,in which the on and the off states switch rapidly by varying the cross angle between two FG magnetizations.Our findings may shed light on the application of magnetized graphene nanoribbons to spintronics devices.     

具有生物活性的有机磷化合物的研究：Ⅶ.4—（喹恶啉—2—氧基）苯基烷基N…

烷基磷酰二氯分别与４－（喹Ｗｕ啉－２－氧基）苯酚钠和仲胺在极性有机溶剂中亲核取代反应合成了８种新的标题化合物，其结构用元素分析，红外光谱，核磁区振谱及质进行了表征，并测定它们的除草活性。     

Topological phase in one-dimensional Rashba wire

We study the possible topological phase in a one-dimensional(1D) quantum wire with an oscillating Rashba spin–orbital coupling in real space. It is shown that there are a pair of particle–hole symmetric gaps forming in the bulk energy band and fractional boundary states residing in the gap when the system has an inversion symmetry. These states are topologically nontrivial and can be characterized by a quantized Berry phase ±π or nonzero Chern number through dimensional extension. When the Rashba spin–orbital coupling varies slowly with time, the system can pump out 2 charges in a pumping cycle because of the spin flip effect. This quantized pumping is protected by topology and is robust against moderate disorders as long as the disorder strength does not exceed the opened energy gap.     

Spin-polarized transport in a normal/ferromagnetic/normal zigzag graphene nanoribbon junction

We investigate the spin-dependent electron transport in single and double normal/ferromagnetic/normal zigzag graphene nanoribbon (NG/FG/NG) junctions. The ferromagnetism in the FG region originates from the spontaneous magnetization of the zigzag graphene nanoribbon. It is shown that when the zigzag-chain number of the ribbon is even and only a single transverse mode is actived, the single NG/FG/NG junction can act as a spin polarizer and/or a spin analyzer because of the valley selection rule and the spin-exchange field in the FG, while the double NG/FG/NG/FG/NG junction exhibits a quantum switching effect, in which the on and the off states switch rapidly by varying the cross angle between two FG magnetizations. Our findings may shed light on the application of magnetized graphene nanoribbons to spintronics devices.