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- 저자 : ( Xue Huang Lei Qin ) (검색결과 3 건)
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( Xin Song Li Dong ),( Xue Huang Lei Qin ),( Xiuwei Han ) 한국인터넷정보학회 2020 KSII Transactions on Internet and Information Syst Vol.14 No.11
In the practical communication environment, the accurate channel state information (CSI) is difficult to obtain, which will cause the mismatch of resource and degrade the system performance. In this paper, to account for the channel uncertainties, a robust power allocation scheme for a downlink Non-orthogonal multiple access (NOMA) heterogeneous network (HetNet) is designed to maximize energy efficiency (EE), which can ensure the quality of service (QoS) of users. We conduct the robust optimization model based on worse-case method, in which the channel gains belong to certain ellipsoid sets. To solve the non-convex non-liner optimization , we transform the optimization problem via Dinkelbach method and sequential convex programming, and the power allocation of small cell users (SCUs) is achieved by Lagrange dual approach. Finally, we analysis the convergence performance of proposed scheme. The simulation results demonstrate that the proposed algorithm can improve total EE of SCUs, and has a fast convergence performance.
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Mi, Longqing,Feng, Yongyi,Cao, Lei,Xue, Mingqiang,Huang, Yanlin,Qin, Lin,Seo, Hyo Jin Elsevier 2018 Spectrochimica acta. Part A, Molecular and biomole Vol.192 No.-
<P><B>Abstract</B></P> <P>Silver-containing lanthanum metaniobate Ag<SUB>0.5</SUB>La<SUB>0.5</SUB>Nb<SUB>2</SUB>O<SUB>6</SUB> nanoparticles were synthesized by sol-gel polymerized complex method. A typical defect-perovskite structure was confirmed by XRD Rietveld refinements. The surface characteristics of the sample were tested by SEM, TEM and EDS measurements. SEM and TEM show that the sample presents ball-like particles with the diameters of 100nm to 400nm. The sample shows both self-activated luminescence and photocatalytic activities. Ag<SUB>0.5</SUB>La<SUB>0.5</SUB>Nb<SUB>2</SUB>O<SUB>6</SUB> has a direct transition with band energy of 2.85eV. The Ag4d-O2p hybridization in the valence band contributes to the narrowed band gap. The luminescence properties of Ag<SUB>0.5</SUB>La<SUB>0.5</SUB>Nb<SUB>2</SUB>O<SUB>6</SUB> have been investigated for the first time. The luminescence is characterized by two emission centers with maximum wavelength near 460 and 530nm. The emission and excitation spectra, decay curves and the thermal quenching mechanism were discussed. Ag<SUB>0.5</SUB>La<SUB>0.5</SUB>Nb<SUB>2</SUB>O<SUB>6</SUB> shows the efficient photocatalytic activities and the photodegradation rate for methylene blue dye (MB) can reach about 95% under visible light (>420nm) irradiation in 5h. The trapped experiments for the active species were tested and discussed, which verified that OH radicals could be the major active species in photocatalysis.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A new silver-containing metaniobate Ag<SUB>0.5</SUB>La<SUB>0.5</SUB>Nb<SUB>2</SUB>O<SUB>6</SUB> was synthesized. </LI> <LI> Ag<SUB>0.5</SUB>La<SUB>0.5</SUB>Nb<SUB>2</SUB>O<SUB>6</SUB> has a typical defect-perovskite structure. </LI> <LI> Ag<SUB>0.5</SUB>La<SUB>0.5</SUB>Nb<SUB>2</SUB>O<SUB>6</SUB> shows both self-activated luminescence and photocatalytic activities. </LI> <LI> The mechanisms of luminescence and photocatalysis were elucidated. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Qing Hua Zhang,Rui Sheng,Zhao Hua Ren,Jing Huang,Yun Xiao Wang,Ben Ru Wang,Xi Lei Huang,Qin Cheng,Xue Mei Wu,Tong Bo Wang 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.120 No.-
The micellization and the molecular interaction behaviors for two ternary mixtures constituted by anamphoteric sodium 3-(n-dodecyl ethylenediamino)-2-hydroxypropyl sulfonate (C12AS), an anionicsodium dodecylbenzene sulfonate (SDBS) and a nonionic octylphenol polyoxyethylated ether with thenumber (n) of oxyethylene glycol ethers OP-n (n = 10 or 7) in aqueous solution were investigated usingthe tensiometry and the effect of hydrophilicity on them was also discussed. In the framework of pseudophaseseparation model and based on the regular solution theory, the related micellization parametersincluding the mixed critical micelle concentration (cmc) values in the ideal and real cases, the activitycoefficients and the compositions in mixed micelle, etc. and thermodynamic parameters were estimatedby the Clint’s model and the Rubingh’ model. The mixed cmc value is dependent on the composition inaqueous solution and influenced by the hydrophilicity of nonionic surfactant. With increasing the nonionicin ternary mixture, the mixed cmc value is initially decreased and then slightly rise. An increasingin the hydrophilicity of nonionic will make the minimum value of mixed cmc be increased from1.299 mM to 1.705 mM. The resulting phenomena can be explained reasonably by the electrostatic effect,the steric hindrance, the hydrogen bonding, etc. Thermodynamic data indicate that the contribution ofentropy or enthalpy plays a vital role on the spontaneous process of micellization and the share ofentropy or enthalpy in free energy change is dependent largely on the amount of nonionic surfactantand the hydrophilicity. In ternary mixtures of C12AS/SDBS/OP-10, an increase in an amount of OP-10 willinduce the change from the enthalpy-driven micellization process to the entropically favorable process. Once an abundant amount of OP-7 is added, while, the enthalpy will make a main contribution on themicellization process, which can be described by the drop in the share of entropy at the composition(0.6970/0.0000/0.3030) of ternary mixture from 0.6478 to 0.4901. These findings will help with understandingthe molecular interaction behavior for the ternary surfactant mixture and the effect of the additionof nonionic surfactant and its hydrophilicity.
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