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Electromagnetic behavior of two-dimensional quasi-crystal left-handed materials with dendritic unit

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Chinese Science Bulletin 2008年第4期53卷 632-637页

作者： ZHOU Xin zhao xiaopeng Institute of Electrorheological Technology Northwestem Polytechnical University Xi'an 710072 China

We demonstrated a two-dimensional quasi-crystal dendritic structure model with negative *** microwave transmission and reflection properties of periodic and quasi-crystal dendritic structure mediums with varied angle incidence were *** results showed that the resonant peaks of quasi-crystal negative permeability samples and left-handed samples had tiny shift with the altering of incident *** of the influence of coupling between quasi-crystal dendritic cells,the resonance of the entire material was enhanced or *** quasi-crystal dendritic structure model will provide an easy method to design isotropic left-handed materials(LHMs).

关键词：左手材料树枝状结构准晶体电磁性能

Electrorheological fluid of kaolinite-based ternary nanocomposite and its properties

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Science China(Technological Sciences) 2005年第5期48卷 496-509页

作者： WANG Baoxiang zhao xiaopeng YAO Yuan Institute of Electrorheological Technology Department of Applied Physics Northwestern Polytechnical University Xi'an 710072 China Institute of Electrorheological Technology Department of Applied Physics Northwestern Polytechnical University Xi'an 710072 China Institute of Electrorheological Technology Department of Applied Physics Northwestern Polytechnical University Xi'an 710072 China

According to the physical and chemical design, a kind of kaolinite /dimethylsulfoxide/carboxymethyl starch (CMS) ternary nanocomposite was prepared by the two-step composite method. Firstly, the polar liquid-dimethylsulfoxide (DMSO) was directly intercalated into the interlayer of kaolinite, and then the intercalated complex was composite with CMS by the solution method. The results showed that DMSO moderately intercalated the interlayer of kaolinite and the basal spacing of kaolinite was swollen from 0.715 to 1.120 nm. Under the electric fields of 5 kV mm-1 and volume fraction 30%, the static shear stress of kaolinite/DMSO/CMS ternary ERF could reach 17 kPa, which was 14 times and 4.25 times higher than that of pure kaolinite ERF and kaolinite/CMS ERF respectively. At the suitable component ratio (kaolinite:DMSO:CMS=1:0.75:0.6) of nanocomposite, a stronger synergetic effect and the optimum electrorheological effect could be attained. The ternary nanocomposite ERF also had good temperature effect and sedimentation properties. The sedimentation part of ternary nanocomposite ERF was only 9% after 30 days. The results of dielectric properties showed that the dielectric constant and conductivity of ternary nanocomposite ERF had been improved more enormously than that of the single component ERF and binary composite ERF. So the polarization and dielectric mismatch were strengthened, which was suitable to the enhancement of ER effect.

关键词： electrorheological fluid, intercalation, ternary system, nanocomposite.

Well-Posedness of Solutions for Sixth-Order Cahn-Hilliard Equation Arising in Oil-Water-Surfactant Mixtures

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Journal of Partial Differential Equations 2020年第3期33卷 193-207页

作者： MENG Haichao zhao xiaopeng School of Science Jiangnan UniversityWuxi 214122China School of Sciences Northeastern UniversityShenyang 110819China

In this paper,by using the Lp-Lq-estimates,regularization property of the linear part of e^-t△3 and successive approximations,we consider the existence and uniqueness of global mild solutions to the sixth-order Cahn-Hilliard equation arising in oil-water-surfactant mixtures in suitable spaces,namely C^0([0,T];W^2,N(l-1)/2(Ω))when the norm||u0||W^2,N(l-1)/2(Ω)is sufficiently small.

关键词： Global solution sixth order Cahn-Hilliard equation uniqueness oil-water-surfactant mixtures

Supramolecular complex formation of β-cyclodextrin polymer with substituted salicylic acid or 3-hydroxy-2-naphthoic acid and their electrorheological behaviors

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Science China Chemistry 2004年第4期47卷 340-348页

作者： GAO Ziwei zhao xiaopeng SUN Ping SI Gang Institute of Electrorheological Technology141# Department of Applied PhysicsNorthwestern Polytechnical UniversityXian 710072China Department of Chemistry School of Chemistry and Material ScienceShaanxi Normal UniversityXi’an 710062China

According to the chemical design, electrorheological properties of supramolecular complex from β-cyclodextrin polymer (β -CDP) were discussed. Six supramolecular complexes of β-cyclodextrin polymer with substituted salicylic acid and 3-hydroxy-2-naphthoic acid were synthesized by the solid-phase self-assembly method, and their component and structure were characterized by NMR, FT-IR, UV-vis and the fluorescence analysis. Then the electrorheological properties of their suspensions in silicone oil were investigated under DC electric fields. It was found that the yield stresses of these supramolecular complex ER fluids were 7.3–9.8 kPa at 4 kV/mm in DC electric field, which were enhanced by 34%–72% compared with that of pure β-CDP. Among them, that of β-CDP/3-hydroxy-2-naphthoic acid ER fluid was the highest. It was also found that the ER effect of supramolecular complexes can be controlled by changing different guests. When the substituted group is at phenyl ring, ER behavior can be slightly adjusted by the different substituted groups, their number as well as their position at phenyl ring. This can be proved by the measurement of dielectric properties.

关键词： electrorheological fluids β-cyclodextrin crosslinking polymer substituted salicylic acid 3-hydroxy-2-naphthoic acid supramolecular complex

Spatial separation of spectrum inside the tapered metamaterial optical waveguide

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Chinese Science Bulletin 2011年第2期56卷 209-214页

作者： CHENG XiaoChao FU QuanHong zhao xiaopeng Smart Materials Laboratory Department of Applied Physics Northwestern Polytechnical University Xi'an 710129 China

In this work,the optical metamaterials based on silver dendritic cells are prepared by electrochemical deposition,and its transmission and focusing behaviors are *** experimental results show that the optical metamaterials reveal a multiple pass-band transmission spectrum and a prominent focusing effect at the wavelength corresponding to the maximum transmission *** optical metamaterial samples are combined into a tapered optical waveguide,and the spectra of transmitted light at the surface of the tapered optical waveguide is measured by using the fiber spectrometer along the light propagation *** results demonstrate that each frequency component of the wave packet is stopped at a different waveguide thickness,leading to the spatial separation of its *** spatial separation of spectrum can be effectively tuned by adjusting the inclination of the tapered optical waveguide,which can be used for storing photons and slow-light research.

关键词：介质光波导锥形波导谱空间分离光纤光谱仪频谱传输系数电化学沉积

A verifiable privacy-preserving data collection scheme supporting multi-party computation in fog-based smart grid

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Frontiers of Computer Science 2022年第1期16卷 143-153页

作者： Zhusen LIU Zhenfu CAO Xiaolei DONG xiaopeng zhao Haiyong BAO Jiachen SHEN Shanghai Key Laboratory of Trustworthy Computing East China Normal UniversityShanghai200062China Cyberspace Security Research Center Peng Cheng LaboratoryShenzhen518055China School of Computer Science and Information Engineering Zhejiang Gongshang UniversityHangzhou310018China

Incorporation of fog computing with low latency,preprocession(e.g.,data aggregation)and location awareness,can facilitate fine-grained collection of smart metering data in smart grid and promotes the sustainability and efficiency of the ***,much attention has been paid to the research on smart grid,especially in protecting privacy and data ***,most previous works do not focus on privacy-preserving data aggregation and function computation query on enormous data simultaneously in smart grid based on fog *** this paper,we construct a novel verifiable privacy-preserving data collection scheme supporting multi-party computation(MPC),named VPDC-MPC,to achieve both functions simultaneously in smart grid based on fog ***-MPC realizes verifiable secret sharing of users’data and data aggregation without revealing individual reports via practical cryptosystem and verifiable secret sharing ***,we propose an efficient algorithm for batch verification of share consistency and detection of error reports if the external adversaries modify the SMs’***,VPDC-MPC allows both the control center and users with limited resources to obtain arbitrary arithmetic analysis(not only data aggregation)via secure multi-party computation between cloud servers in smart ***,VPDC-MPC tolerates fault of cloud servers and resists *** also present security analysis and performance evaluation of our scheme,which indicates that even with tradeoff on computation and communication overhead,VPDC-MPC is practical with above features.

关键词： smart grid fog computing data aggregation verifiable secret sharing error detection secure multi-party computation secure function query privacy-preserving

Self-assembly of polysarcosine amphiphilic polymers-tethered gold nanoparticles for precise photo-controlled synergistic therapy

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Nano Research 2023年第4期16卷 5685-5694页

作者： Runkai Lv Zhengzheng Qian xiaopeng zhao Fei Xiong Yingjie Xu Wenpei Fan Xikuang Yao Wei Huang School of Flexible Electronics(Future Technologies)and Institute of Advanced Materials(IAM) Nanjing Tech University(NanjingTech)Nanjing 211816China State Key Laboratory of Natural Medicines and Jiangsu Key Laboratory of Drug Discovery for Metabolic Diseases Center of Advanced Pharmaceuticals and BiomaterialsChina Pharmaceutical UniversityNanjing 210009China Frontiers Science Center for Flexible Electronics Xi’an Institute of Flexible Electronics(IFE)and Xi’an Institute of Biomedical Materials and EngineeringNorthwestern Polytechnical University127 West Youyi RoadXi’an 710072China Key Laboratory for Organic Electronics and Information Displays and Institute of Advanced Materials Nanjing University of Posts and TelecommunicationsNanjing 210023China

Polymer-induced self-assembly of inorganic nanoparticles has emerged as a powerful strategy for fabrication of stimuliresponsive drug delivery ***,we designed and synthesized a series of lipoic acid-capped polysarcosine-bpolycaprolactone(PSar-b-PCL)block *** self-assembly of gold nanoparticles drove by these block copolymers was systematically investigated,and the preparation of near-infrared(NIR)light-responsive PSar-decorated gold nanovesicle(PSGV)was *** as anticancer drug was efficiently encapsulated within the cavity of *** PSGV greatly prevented doxorubicin(DOX)from premature *** upon 808 nm laser irradiation,most of loaded DOX was rapidly released,along with the recovery of DOX ***,the DOX-loaded PSGV(DOX-PSGV)exhibited much higher cell uptake efficiency when compared to DOX-loaded polyethylene glycol(PEG)-coated gold nanovesicle(DOX-PEGV).Thanks to the synergistic photothermal/chemo therapy,the DOX-PSGV had highly superior antitumor efficacy in established 4T1 tumor model.

关键词： gold nanovesicles polymer-induced self-assembly biodegradable copolymers tumor therapy drug delivery system

Global Well-Posedness of Solutions for the Sixth Order Convective Cahn-Hilliard Equation

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Journal of Mathematical Research with Applications 2021年第2期41卷 150-160页

作者： xiaopeng zhao Fengnan LIU Haichao MENG College of Sciences Northeastern University School of Mathematical Sciences Dalian University of Technology School of Science Jiangnan University

In this paper,we consider the global well-posedness of smooth solutions for the Cauchy problem of a sixth order convective Cahn-Hilliard equation with small initial *** first construct a local smooth solution,then by combining some a priori estimates,continuity argument,the local smooth solution is extended step by step to all t> 0 provided that the L1 norm of initial data is suitably small and the smooth nonlinear functions f(u) and g(u) satisfy certain local growth conditions at some fixed point■.

关键词： Global smooth solution sixth order convective Cahn-Hilliard equation Cauchy problem local existence

Polymerization-Induced Self-Assembly for Efficient Fabrication of Biomedical Nanoplatforms

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Research 2023年第4期2023卷 631-655页

作者： xiaopeng zhao Changrui Sun Fei Xiong Ting Wang Sheng Li Fengwei Huo Xikuang Yao School of Flexible Electronics(Future Technologies)and Institute of Advanced Materials(IAM) Nanjing Tech University(NanjingTech)Nanjing 211816P.R.China

Amphiphilic copolymers can self-assemble into nano-objects in aqueous ***,the selfassembly process is usually performed in a diluted solution(<1 wt%),which greatly limits scale-up production and further biomedical *** recent development of controlled polymerization techniques,polymerization-induced self-assembly(PISA)has emerged as an efficient approach for facile fabrication of nano-sized structures with a high concentration as high as 50 wt%.In this review,after the introduction,various polymerization method-mediated PISAs that include nitroxide-mediated polymerization-mediated PISA(NMP-PISA),reversible addition-fragmentation chain transfer polymerizationmediated PISA(RAFT-PISA),atom transfer radical polymerization-mediated PISA(ATRP-PISA),and ringopening polymerization-mediated PISA(ROP-PISA)are discussed ***,recent biomedical applications of PISA are illustrated from the following aspects,i.e.,bioimaging,disease treatment,biocatalysis,and *** the end,current achievements and future perspectives of PISA are *** is envisioned that PISA strategy can bring great chance for future design and construction of functional nano-vehicles.

关键词： solution polymerization diluted