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- 저자 : Haiwei Yang (검색결과 5 건)
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Graphene Supported Li2SnO3 as Anode Material for Lithium-Ion Batteries
Yang Zhao,Ying Huang,Qiufen Wang,XiaoYa Wang,Meng Zong,Haiwei Wu,Wei Zhang 대한금속·재료학회 2013 ELECTRONIC MATERIALS LETTERS Vol.9 No.5
The graphene supported Li2SnO3 composites were prepared via a deoxidation technique. The structure, morphology and electrochemical properties of the composites were detected by means of XRD, SEM, TEM,Raman, TGA and electrochemical measurements. The Li2SnO3 powders could be distributed on the graphene sheets (GNS). The Li2SnO3/GNS composites exhibit good electrochemical performance with high capacity and good cycling stability (582.2 mAh/g after 50 cycles at 60 mA/g). The performance is ascribed to the presence of graphene keeping the structure stable. The composites Li2SnO3/GNS exhibited a better electrochemical property than Li2SnO3 and graphene.
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Zongqian Wang,Haiwei Yang,Ning Pan,Wei Li,Yanxia Xie,Zhi Liu,Yinchun Fang 한국섬유공학회 2019 Fibers and polymers Vol.20 No.7
Polyethylene/Polypropylene (PE/PP) composite non-woven fabrics have been used widely for surgical packagesdue to its dual features of PE surface and PP surfaces. PP fabric pre-treated by hydrophilic agent provides high waterabsorbency, while PE surface is responsible for high barrier functions. However, the PP water absorbency declines once PEfilm is laminated, and no report devoted to study the extent and the reasons of this declining. Herein, the hydrophilic finishingof the PP non-woven fabrics was processed via Kiss-roll method, then the PE/PP fabrics were obtained using a normal hotmelt adhesive PE film laminating process. The wicking height, water absorption specific gravity (LAC%), static contactangle, as well as the complete wetting time of the finished PP and PE/PP fabric were measured and compared. Meanwhile,the SEM was used to detect the morphology changing. The results revealed that the pores between fibers in the PP nonwovenwere filled with non-hydrophilic hot melt adhesive penetrated during PE lamination, so that the PP structure changedto be less porous. Moreover, the laminated PP layer actually blocks the water flow channel in the system, resulting in theabsorbency reduction after lamination. As a result, comparing with the PP non-woven fabric, the wicking height of the PE/PPfabric decreased by 25.3 %, the LAC % value reduced by 40.83 %, and the complete wetting time extended from 0.29 s to1.74 s.
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QSDB: An Encrypted Database Model for Privacy-Preserving in Cloud Computing
( Guoxiu Liu ),( Geng Yang ),( Haiwei Wang ),( Hua Dai ),( Qiang Zhou ) 한국인터넷정보학회 2018 KSII Transactions on Internet and Information Syst Vol.12 No.7
With the advent of database-as-a-service (DAAS) and cloud computing, more and more data owners are motivated to outsource their data to cloud database in consideration of convenience and cost. However, it has become a challenging work to provide security to database as service model in cloud computing, because adversaries may try to gain access to sensitive data, and curious or malicious administrators may capture and leak data. In order to realize privacy preservation, sensitive data should be encrypted before outsourcing. In this paper, we present a secure and practical system over encrypted cloud data, called QSDB (queryable and secure database), which simultaneously supports SQL query operations. The proposed system can store and process the floating point numbers without compromising the security of data. To balance tradeoff between data privacy protection and query processing efficiency, QSDB utilizes three different encryption models to encrypt data. Our strategy is to process as much queries as possible at the cloud server. Encryption of queries and decryption of encrypted queries results are performed at client. Experiments on the real-world data sets were conducted to demonstrate the efficiency and practicality of the proposed system.
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Ying Huang,Xuanyi Peng,Yiwen Yang,Haiwei Wu,Xu Sun,Xiaopeng Han 대한금속·재료학회 2018 METALS AND MATERIALS International Vol.24 No.5
Proper process and parameter were investigated to coat Cu or Ni on graphite fl ake (G f ) by electroless plating. Microstructuralcharacterization indicated that the Cu/Ni was coated on the G f uniformly and comprehensively. Then aluminum matrixcomposites reinforced with Si and graphite were fabricated by a unique vacuum gas pressure infi ltration. The thermal conductivityand mechanical properties of the composites, both with and without Cu or Ni coating layers on the graphite surface,have been studied. The obtained results indicated that the mechanical property of the Cu or Ni coated G f /Si/Al compositesdramatically increased, as compared with the non-coated G f /Si/Al composite. In the meantime, Cu or Ni coated G f provedto have better wettability and interfacial bonding with the aluminum matrix, which were expected to be a highly sustainableand dispersible reinforcement for metal matrix composites.
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Antifungal Activities of Anthocyanins from Purple Sweet Potato in the Presence of Food Preservatives
Huiliang Wen,Jingjing Kang,Dandan Li,Wen Wen,Fubin Yang,Haiwei Hu,Chongbo Liu 한국식품과학회 2016 Food Science and Biotechnology Vol.25 No.1
Effects of anthocyanins from purple sweet potato (APSP) against the fungal growth of Geotrichum candidum and Candida albicans were assessed. Response surface methodology was applied for optimization of proportions of sodium benzoate, potassium sorbate, and APSP. Optimum concentrations against G. candidum were 0.300 mg/mL of sodium benzoate, 0.290mg/mL of potassium sorbate, and 13.9mg/mL of APSP. Optimum concentrations against C. albicans were 0.380 mg/mL of sodium benzoate, 0.240 mg/mL of potassium sorbate, and 3.56 mg/mL of APSP. APSP exhibited enhanced antifungal properties in the presence of food preservatives.
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