基于超图和线图的β环与其它环的关系

通过大量图例，以β环为中心，系统地讨论了基于超图的β环与纯环、β环与弱β环、弱β环与γ环、β环与γ环的关系，以及基于线图的无β环与无α环、无β环与无α环之间的关系。     

The nonleptonic two body B decays involving a light tensor meson in final states

The nonleptonic two body Bu,d,s,c decays involving a light tensor meson in final states are studied in the perturbative QCD approach based on kT factorization. The decay modes with a tensor meson emitted, are prohibited in naive factorization, since the emission diagram with a tensor meson produced from vacuum is vanished. While contributions from the so-called hard scattering emission diagrams and annihilation type diagrams are important and calculable in the perturbative QCD approach. The branching ratios of most decays are in the range of 10-4-10-8, which are bigger by 1 or 2 orders of magnitude than the predictions given by the naive factor- ization, but consistent with the predictions from the QCD factorization and the recent experimental measurements. We also give the predictions for the direct CP asymmetries, some of which are large enough for the future experiments to measure. We also find that, even with a small mixing angle, the mixing between f2 and f′2 can bring remarkable changes to both branching ratios and the direct CP asymmetries for some decays involving f2（′） mesons. For decays with a vector meson and a tensor meson in final states, we predict a large percentage of transverse polarization contributions due to the contributions of the orbital angular momentum of the tensor mesons.     

The Supernetwork Model of Social Networking Services

The unique ways of information organization and dissemination was examined through the microblog and the real-name social network as the representatives of the new virtual social networks. In order to discuss the interrelation and interaction of the two dimensions-topic and user, a supernetwork model was established based on the supernetwork research method. Through the actual data, a supernetwork topology diagram and the changing rule of user participation were attained. And it was concluded that the key factor of dealing with emergent online public sentiment should start with affecting the opinions of key figures, whose opinions would further affect the public opinions.     

浅述离体肌向心收缩的生物力学特性

肌肉是人体运动系统重要的组成部分,是人体运动的动力来源。可以说肌肉是生物学研究中最具吸引力和挑战性的研究领域。文章叙述了肌肉的工作原理、肌肉的三元素模型及其在向心收缩时的生物力学特性。     

吉赫兹横电磁波传输室连接头的优化设计

吉赫兹横电磁波(GTEM)传输室在电磁兼容测试领域应用广泛。GTEM传输室过渡连接头对GTEM传输室性能的影响较大。过渡连接头连接同轴传输线与GTEM传输室主体,是从圆形同轴传输线过渡到矩形同轴线的转换部件。如果过渡连接头处存在结构不连续,使其特性阻抗与GTEM传输室不匹配,将会引起电磁波反射和激发高次模现象,降低传输室的传输性能。根据GTEM传输室的技术要求,以传输系统阻抗连续为原则,对过渡接头内导体外表面和外导体内表面的形状进行同时设计,使内导体外表面与外导体内表面光滑过渡,过渡接头的特性阻抗与系统匹配。对前后端分别与标准同轴线和斧形件相连接部位进行结合设计,保证连接表面光滑,尽量降低突变。根据设计计算数据,通过设计软件SolidWorks对过渡接头构造精确三维模型。将三维模型导入电磁软件HFSS进行仿真测试。这样,对保证过渡接头特性阻抗恒定提供了一种有效的设计方法;可以将构建的数学模型直接导入电磁仿真软件,以便进一步分析;也可以将内、外导体三维结构数模导入数控机床加工,保证内外导体表面的精度要求。     

具有最小连通点对图的C-超图的染色讨论

主要讨论C-超图的染色与点的点对图的连通性之间的关系,证明了对任意给定的不小于3的正整数n,都存在上色数为n且具有最小连通点对图的3一致C-超图.     

基于有权重超图模型的离群点发现

结合基于有权重支持度框架的关联规则挖掘方法和基于超图模型的离群点检测方法,给出了一种离群数据的改进定义,并通过一个简单的实例说明了这种离群数据的离群含义,且与原离群点定义做了比较,分析了新定义离群数据的应用价值.     

Experimental investigation on upstream-injection interaction with a scramjet cavity flameholder

The study has evaluated the coherent structures and the velocity field of gaseous transverse jet upstream of a scramjet flameholder in a supersonic turbulent flow. The high spatiotemporal resolution coherent structures of the jet plume/wakes and the cavity shear layer were obtained by utilizing the nanoparticle-based planar laser scattering technique. Compared to the no upstream injection case, the cavity shear layer downstream of the jet shows significant mass exchange with mainstream. The particle image veloc- imetry velocity field and the velocity profiles demonstrated that the interaction intensity of the cavity shear layer with the upstream injection is further enhanced as the injection stagnation pressure increases.     

“随机”与“择优”——超网络演化的内在驱动力

基于"随机连接"和"择优选择"的演化机制,构建了一个随机-择优混合超网络演化模型。使用Poisson过程理论和连续化方法对模型进行分析,获得超度分布的解析表达式,分析表明网络的稳态平均超度分布服从漂移的幂律分布。该模型可以退化到复杂网络和超网络中的标准模型,具有一定的普适性。通过调节机制系数,模型可以体现混合连接机制。并对3个实证数据进行了分析,该模型能有效刻画不同数据的演化机理。     

考虑横向剪切效应的竹材层合板弯曲变形

用层梁经典理论,一阶剪切变形理论以及有限单元法分别计算了竹材层合板梁的弯曲变形,为验证理论分析与数值计算结果是否合理,对实际结构变形进行了测定。结果显示,竹材层合板梁在跨高比较小时具有十分显的的横向剪切交 ,一阶剪切变形理论与有限单元法均能足够精确地反映含有剪切效应的梁的弯曲变形,横向剪切效应很小时,经典理论的解与实际情况的符合程序优于一阶剪切变形理论。