Anisotropic Rabi model

We define the anisotropic Rabi model as the generalization of the spin-boson Rabi model: The Hamiltonian system breaks the parity symmetry; the rotating and counter-rotating interactions are governed by two different coupling constants; a further parameter introduces a phase factor in the counter-rotating terms. The exact energy spectrum and eigenstates of the generalized model is worked out. The solution is obtained as an elaboration of a recent proposed method for the isotropic limit of the model. In this way, we provide a long sought solution of a cascade of models with immediate relevance in different physical fields, including i) quantum optics: two-level atom in single mode cross electric and magnetic fields; ii) solid state physics: electrons in semiconductors with Rashba and Dresselhaus spin-orbit coupling; iii) mesoscopic physics: Josephson junctions flux-qubit quantum circuits.Comment: 5 pages+ 6 pages supplementary, 7 figures, accepted by Phys. Rev.

KINEMATIC ANALYSIS OF BASKET WITH 5/4 TURN TO HANDSTAND OF SHIXIONG ZHOU ON PARALLEL BARS

The basket with 5/4 turn to handstand on parallel bars is a representative movement of E group; in 1896 it is listed as the Olympic Games project. The parallel bars have been one of the Chinese men's gymnastics advantage projects since 1980s. From 1980 to 2011, China's elite athletes Li Yuejiu, Lou Yun, Li Jing, Huang Liping, Zhang Jingjin, Li Xiaopeng and Yang Wei won more than a dozen times world champion on the parallel bars in the world gymnastics competitions. China's athletes can keep long-term advantage of this project status and competitive strength, in addition to keep pace with the times innovation of difficult moves, there is another important reason is to continuously improve the leading trend of action quality

(EMC)-M-3: Improving Energy Efficiency via Elastic Multi-Controller SDN in Data Center Networks

Energy consumed by network constitutes a significant portion of the total power budget in modern data centers. Thus, it is critical to understand the energy consumption and improve the power efficiency of data center networks (DCNs). In doing so, one straightforward and effective way is to make the size of DCNs elastic along with traffic demands, i.e., turning off unnecessary network components to reduce the energy consumption. Today, software defined networking (SDN), as one of the most promising solutions for data center management, provides a paradigm to elastically control the resources of DCNs. However, to the best of our knowledge, the features of SDN have not been fully leveraged to improve the power saving, especially for large-scale multi-controller DCNs. To address this problem, we propose (EMC)-M-3, a mechanism to improve DCN\u27s energy efficiency via the elastic multi-controller SDN. In (EMC)-M-3, the energy optimizations for both forwarding and control plane are considered by utilizing SDN\u27s fine-grained routing and dynamic control mapping. In particular, the flow network theory and the bin-packing heuristic are used to deal with the forwarding plane and control plane, respectively. Our simulation results show that E3MC can achieve more efficient power management, especially in highly structured topologies such as Fat-Tree and BCube, by saving up to 50% of network energy, at an acceptable level of computation cost

Quantized distributed Nash equilibrium seeking under DoS attacks: A quantized consensus based approach

This paper studies distributed Nash equilibrium (NE) seeking under Denial-of-Service (DoS) attacks and quantization. The players can only exchange information with their own direct neighbors. The transmitted information is subject to quantization and packet losses induced by malicious DoS attacks. We propose a quantized distributed NE seeking strategy based on the approach of dynamic quantized consensus. To solve the quantizer saturation problem caused by DoS attacks, the quantization mechanism is equipped to have zooming-in and holding capabilities, in which the holding capability is consistent with the results in quantized consensus under DoS. A sufficient condition on the number of quantizer levels is provided, under which the quantizers are free from saturation under DoS attacks. The proposed distributed quantized NE seeking strategy is shown to have the so-called maximum resilience to DoS attacks. Namely, if the bound characterizing the maximum resilience is violated, an attacker can deny all the transmissions and hence distributed NE seeking is impossible

A Research on Continuous Using Intention of the Q&A Community Platform: Evidence from “Zhihu.Com”

We set “zhihu.com” as an example and integrate a new model to study the user\u27s intention to continuously using the network Q & A community platform based on traditional S-O-R model, Information System (IS) success model, the unified theory of acceptance and use of technology (UTAUT) model and Error Correction Model (ECM). In the social dimension, technological dimension, service quality dimension, we carried out an empirical research on the important factors affecting the user\u27s continually using the network Q & A community platform. Finally, we put forward suggestions and Countermeasures on how to manage the network innovation community and encourage users to participate it effectively