Huazhong University of Science and Technology

About: Huazhong University of Science and Technology is a education organization based out in Wuhan, China. It is known for research contribution in the topics: Population & Laser. The organization has 120339 authors who have published 122521 publications receiving 2168040 citations. The organization is also known as: Central China University of Science and Technology.

Detecting Overlapping Communities from Local Spectral Subspaces

Abstract: Based on the definition of local spectral subspace, we propose a novel approach called LOSP for local overlapping community detection. Using the power method for a few steps, LOSP finds an approximate invariant subspace, which depicts the embedding of the local neighborhood structure around the seeds of interest. LOSP then identifies the local community expanded from the given seeds by seeking a sparse indicator vector in the subspace where the seeds are in its support. We provide a systematic investigation on LOSP, and thoroughly evaluate it on large real world networks across multiple domains. With the prior information of very few seed members, LOSP can detect the remaining members of a target community with high accuracy. Experiments demonstrate that LOSP outperforms the Heat Kernel and PageRank diffusions. Using LOSP as a subroutine, we further address the problem of multiple membership identification, which aims to find all the communities a single vertex belongs to. High F1 scores are achieved in detecting multiple local communities with respect to arbitrary single seed for various large real world networks.

Toothpaste-like Electrode: A Novel Approach to Optimize the Interface for Solid-State Sodium-Ion Batteries with Ultralong Cycle Life

Abstract: A non-sintered method with toothpaste electrode for improving electrode ionic conductivity and reducing interface impedance is introduced in solid-state rechargeable batteries. At 70 °C, this novel solid-state battery can deliver a capacity of 80 mAh g–1 in a voltage range of 2.5–3.8 V at 0.1C rate using layered oxide Na0.66Ni0.33Mn0.67O2, Na-β″-Al2O3 and sodium metal as cathode, electrolyte and anode, respectively. Moreover, the battery shows a superior stability and high reversibility, with a capacity retention of 90% after 10 000 cycles at 6C rate and a capacity of 79 mAh g–1 is recovered when the current rate is returned to 0.1C. Furthermore, a very thick electrode with active material mass loading of 6 mg cm–2 also presents a reasonable electrochemical performance. These results demonstrate that this is a promising approach to solve the interface problem and would open a new route in designing the next generation solid-state battery.

Doing Good Business by Hiring Directors with Foreign Experience

Abstract: Using a manually collected dataset on the overseas experiences of directors of Chinese listed firms, we examine the effects of returnee directors on firms’ corporate social responsibility (CSR) engagement. Our results show that returnee directors significantly improve their firms’ CSR engagement. The positive relationship between the percentage of returnee directors and CSR engagement is more significant when a firm is in a competitive industry, when a firm has no government ownership, when a firm’s CEO is not politically connected, and when a firm’s CEO is older. Furthermore, we find that only long-term foreign professional or academic experience matters, whereas short-term visiting experience does not. Finally, our results are robust after controlling for endogeneity. Therefore, this paper offers clear policy implications by suggesting that hiring more returnees as corporate directors is an efficient way to enhance firms’ CSR, which may be of particular interest to regulators in emerging markets.