University of Science and Technology Beijing

About: University of Science and Technology Beijing is a education organization based out in Beijing, China. It is known for research contribution in the topics: Microstructure & Alloy. The organization has 41558 authors who have published 44473 publications receiving 623229 citations. The organization is also known as: Beijing Steel and Iron Institute.

A Lightweight Multicast Authentication Mechanism for Small Scale IoT Applications

Abstract: Security is very important for Internet of Things (IoTs). As a main communication mode, the security mechanism for multicast is not only the measure to ensure secured communications, but also the precondition for other security services. With the analysis of Nyberg's fast one-way accumulator and its security, we discover that it has the property of absorbency in addition to the one-way and quasi-communicative property that makes it very suitable for applications in which accumulated items are dynamic. In this paper, we revise the original Nyberg's fast one-way accumulator and construct a lightweight multicast authentication mechanism for small scale IoT applications. We analyze the security of the mechanism in detail. In addition, we evaluate seven performance aspects of the mechanism.

Electric Field Induced Switchable Wettability to Water on the Polyaniline Membrane and Oil/Water Separation

Abstract: Smart surfaces with responsive wettability to external stimulus have attracted considerable attention especially in oil/water/solid interface, whereas there still remain challenges of response in situ, low voltage, and stable substrate. Here, a strategy is proposed to achieve the electric field induced water selectively permeation for oil/water separation based on the stainless steel mesh coated with root-like polyaniline nanofibers fabricated by emulsion polymerization. Such micro/nanoscale hierarchical-structured polyaniline mesh is superhydrophobic and underwater superoleophobic, while its superhydrophobicity can turn to hydrophilicity at 160 V and can further selectively filter water at 170 V. As a result, the electric field induced oil/water separation is realized as long as the electric capillary pressure (ECP) is larger than the hydrostatic pressure of the membrane to water, i.e., ECP induced wettability to water transition. The mesh shows low underwater oil-adhesion force and the anti-corrosion of polyaniline, indicating that the mesh could keep working under severe environment during the practical application. Thus, this work is promising in the application of controllable oil/water separation and will also be beneficial to the study of smart filtration, microreactors, and microfluidic devices.