86 research outputs found
Identifying WeChat Red Packets and Fund Transfers Via Analyzing Encrypted Network Traffic
No full textHierarchical Identifier: Application to User Privacy Eavesdropping on Mobile Payment App
No full textMobile payment apps have been widely-adopted, which brings great convenience to people’s lives. However, at the same time, user’s privacy is possibly eavesdropped and maliciously exploited by attackers. In this paper, we consider a possible way for an attacker to monitor people’s privacy on a mobile payment app, where the attacker aims to identify the user’s financial transactions at the trading stage via analyzing the encrypted network traffic. To achieve this goal, a hierarchical identification system is established, which can acquire users’ privacy information in three different manners. First, it identifies the mobile payment app from traffic data, then classifies specific actions on the mobile payment app, and finally, detects the detailed steps within the action. In our proposed system, we extract reliable features from the collected traffic data generated on the mobile payment app, then use a series of well-performing ensemble learning strategies to deal with three identification tasks. Compared with prior works, the experimental results demonstrate that our proposed hierarchical identification system performs better
Influences of the Ag content on microstructures and properties of Zn–3Mg–xAg alloy by spark plasma sintering
No full textIn order to improve the comprehensive mechanical properties of Zn–3Mg alloy to meet application requirements of medical metal implants, spark plasma sintering (SPS) was adopted to prepare Zn–3Mg–xAg alloy (x = 0, 1, 1.5, 2, 2.5). Electron backscatter diffraction (EBSD)observation was adopted to investigate the growth twins in Zn–3Mg–xAg alloy, and then influences of Ag element on compactness, microstructure, tensile and compression properties of the zinc-based alloy were studied. Results showed that the length of growth twins first increased, then decreased with the increase of Ag element. Growth twins improved the ductility of alloy by turning the hard oriented grains into soft ones. The Zn–3Mg–1.5Ag alloy showed the best comprehensive mechanical properties due to the joint effect of solid solution strengthening, precipitation phase strengthening, fine grain strengthening and defect weakening. The tensile strength of Zn–3Mg–1.5Ag was 273.8 ± 16.9 MPa, which was 2.5 and 1.6 times that of Zn and Zn–3Mg respectively; the elongation was 10.67 ± 0.77%, which was 3.6 and 2.6 times that of Zn and Zn–3Mg respectively. Compressive strength of Zn–3Mg–1.5Ag was 543.7 ± 38.1 MPa, which was 3.8 times that of Zn; fracture strain of Zn–3Mg–1.5Ag was 20.49 ± 1.21%, which was 2 and 1.5 times of pure Zn and Zn–3Mg alloy
Mechanically induced color change based on the chromophores of anthracene and rhodamine 6G
No full textWe report herein the mechanically induced luminescent color change of a molecule with two anthracene moieties and a rhodamine 6G unit at both sides of a branched amidoamine spacer. Different emission properties of this compound are due to the pi-pi overlap of anthracene moieties and the ring-opening reaction of rhodamine 6G. (C) 2014 Elsevier Ltd. All rights reserved.http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000348265100025&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701Chemistry, OrganicSCI(E)[email protected]
Organic contaminant removal efficiency of sodium bentonite/clay (BC) mixtures in high permeability regions utilizing reclaimed wastewater: A meso-scale study
No full textOrganic contaminant removal efficiency of sodium bentonite/clay (BC) mixtures in high permeability regions utilizing reclaimed wastewater: A meso-scale study
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Distinction between pristine and disorder-perturbed charge density waves in ZrTe3
No full text© 2020, The Author(s). Charge density waves (CDWs) in the cuprate high-temperature superconductors have evoked much interest, yet their typical short-range nature has raised questions regarding the role of disorder. Here we report a resonant X-ray diffraction study of ZrTe3, a model CDW system, with focus on the influence of disorder. Near the CDW transition temperature, we observe two independent signals that arise concomitantly, only to become clearly separated in momentum while developing very different correlation lengths in the well-ordered state that is reached at a distinctly lower temperature. Anomalously slow dynamics of mesoscopic charge domains are further found near the transition temperature, in spite of the expected strong thermal fluctuations. Our observations signify the presence of distinct experimental fingerprints of pristine and disorder-perturbed CDWs. We discuss the latter also in the context of Friedel oscillations, which we argue might promote CDW formation via a self-amplifying process
Investigation of Adopting Shrink-Fit Multilayered Aluminum Shell in High-Field Common-Coil Accelerator Dipole Magnet
No full textRecent development of high gradient superconducting magnetic separator for kaolin in china
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