Dynamical Behaviors of Rumor Spreading Model with Control Measures

Rumor has no basis in fact and flies around. And in general, it is propagated for a certain motivation, either for business, economy, or pleasure. It is found that the web does expose us to more rumor and increase the speed of the rumors spread. Corresponding to these new ways of spreading, the government should carry out some measures, such as issuing message by media, punishing the principal spreader, and enhancing management of the internet. In order to assess these measures, dynamical models without and with control measures are established. Firstly, for two models, equilibria and the basic reproduction number of models are discussed. More importantly, numerical simulation is implemented to assess control measures of rumor spread between individuals-to-individuals and medium-to-individuals. Finally, it is found that the amount of message released by government has the greatest influence on the rumor spread. The reliability of government and the cognizance ability of the public are more important. Besides that, monitoring the internet to prevent the spread of rumor is more important than deleting messages in media which already existed. Moreover, when the minority of people are punished, the control effect is obvious

Moving Stationary State of Exciton-Phonon Condensate in Cu2O

We explore a simple theoretical model to describe the properties of Bose condensed para-excitons in Cu2O. Taking into account the exciton-phonon interaction and introducing a coherent phonon part of the moving condensate, we derive the dynamic equations for the exciton-phonon condensate. Within the Bose approximation for excitons, we discuss the conditions for the moving inhomogeneous condensate to appear in the crystal. We calculate the condensate wave function and energy and a collective excitation spectrum in the semiclassical approximation. The stability conditions of the moving condensate are analyzed by use of Landau arguments, and two critical velocities appear in the theory. Finally, we apply our model to describe the recently observed interference between two coherent exciton-phonon packets in Cu2O.Comment: 20 pages (LaTeX), one figure (.ps) incorporated by epsf. Submitted to Phys. Stat. Sol (B

A Study on the Weakening of Physical Fitness in Physical Education Reform of China

The Chinese students\u27 physical fitness was weakening from 1985 to 2005. Since 1995, almost all the physical fitness indicators have showed substantial decline over times. This study took this issue as the breakthrough point to examine how the physical education (PE) curriculum reform affected the students’ physical fitness in China. The primary and secondary school physical fitness literature has been reviewed. This study summarized the change of PE reform theory and practice during this period. Using the descriptive statistics, the proportions of physical activity in the PE curriculum of Chinese primary and secondary schools were analyzed. In the reform process of school PE in China from single dimension to multi-dimension, the generalization of PE function has blurred the essential function of physical fitness. The PE curriculum of 1992 in Chinese mandatory education was implemented for ten years. During this period, the economy has developed rapidly, and the curriculum showed a relatively weaken trend. Compared with the past curriculum, the PE curriculum of 1997 in Chinese high school has reduced the requirement of physical activity portion in PE classes. Furthermore, the physical activity and physical fitness evaluation were not paid enough attention in school evaluation and assessment. Due to insufficient course consciousness and ability, PE teachers have weakened the effectiveness of physical activity in PE teaching practice. Compared with the social, economic, and cultural development of China during this period, the reform of PE curriculum showed the weakening trend, which coincided with the tendency of students\u27 physical fitness decline. Physical activity and fitness are the foundations to reach school PE goals. The weakening of physical activity and fitness would lead to the difficulty for students to achieve the objectives of strengthening students\u27 health, cultivating interests and habits, mastering techniques, and improving motor ability in school PE. It is recommended to examine the tendency of continuous weakening of physical fitness in the current reform of PE in China, and take effective measures to improve the impact of insufficient physical activities on students’ physical health

Get Out of the Valley: Power-Efficient Address Mapping for GPUs

GPU memory systems adopt a multi-dimensional hardware structure to provide the bandwidth necessary to support 100s to 1000s of concurrent threads. On the software side, GPU-compute workloads also use multi-dimensional structures to organize the threads. We observe that these structures can combine unfavorably and create significant resource imbalance in the memory subsystem causing low performance and poor power-efficiency. The key issue is that it is highly application-dependent which memory address bits exhibit high variability. To solve this problem, we first provide an entropy analysis approach tailored for the highly concurrent memory request behavior in GPU-compute workloads. Our window-based entropy metric captures the information content of each address bit of the memory requests that are likely to co-exist in the memory system at runtime. Using this metric, we find that GPU-compute workloads exhibit entropy valleys distributed throughout the lower order address bits. This indicates that efficient GPU-address mapping schemes need to harvest entropy from broad address-bit ranges and concentrate the entropy into the bits used for channel and bank selection in the memory subsystem. This insight leads us to propose the Page Address Entropy (PAE) mapping scheme which concentrates the entropy of the row, channel and bank bits of the input address into the bank and channel bits of the output address. PAE maps straightforwardly to hardware and can be implemented with a tree of XOR-gates. PAE improves performance by 1.31 x and power-efficiency by 1.25 x compared to state-of-the-art permutation-based address mapping

Logarithmically Improved Blow up Criterion for Smooths Solution to the 3D Micropolar Fluid Equations

Blow-up criteria of smooth solutions for the 3D micropolar fluid equations are investigated. Logarithmically improved blow-up criteria are established in the Morrey-Campanto space

Imaging of the Space-time Structure of a Vortex Generator in Supersonic Flow

AbstractThe fine space-time structure of a vortex generator (VG) in supersonic flow is studied with the nanoparticle-based planar laser scattering (NPLS) method in a quiet supersonic wind tunnel. The fine coherent structure at the symmetrical plane of the flow field around the VG is imaged with NPLS. The spatial structure and temporal evolution characteristics of the vortical structure are analyzed, which demonstrate periodic evolution and similar geometry, and the characteristics of rapid movement and slow change. Because the NPLS system yields the flow images at high temporal and spatial resolutions, from these images the position of a large scale structure can be extracted precisely. The position and velocity of the large scale structures can be evaluated with edge detection and correlation algorithms. The shocklet structures induced by vortices are imaged, from which the generation and development of shocklets are discussed in this paper