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A porous high-entropy alloy for high-efficient oxygen evolution reaction

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Rare Metals 2023年第7期42卷 2174-2181页

作者： Wei Wang Yun-zhuo lu Xing lu School of Materials Science and Engineering Dalian Jiaotong UniversityDalian116028China

Oxygen evolution reaction(OER)plays a crucial role in regulating the process of hydrogen production from water splitting where an expeditious,stable and low-cost electrocatalyst is urgently *** employing a facile strategy of selective phase dissolution,this dissertation attempts to illuminate the successful preparation of a porous AlCoCrFeNi high-entropy alloy(SPD-48 h).

关键词： alloy entropy evolution

Bayesian integer frequency offset estimator for MIMO-OFDM systems

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Journal of Systems Engineering and Electronics 2008年第6期19卷 1109-1114页

作者： Zhao Linjing lu zhuo Li Jiandong Broadband Wireless Communications Lab Information Science Inst. State Key Lab of ISN Xidian Univ. Xi'an 710071 P. R. China

Carrier frequency offset （CFO） in MIMO-OFDM systems can be decoupled into two parts： fraction frequency offset （FFO） and integer frequency offset （IFO）. The problem of IFO estimation is addressed and a new IFO estimator based on the Bayesian philosophy is proposed. Also, it is shown that the Bayesian IFO estimator is optimal among all the IFO estimators. Furthermore, the Bayesian estimator can take advantage of oversampling so that better performance can be obtained. Finally, numerical results show the optimality of the Bayesian estimator and validate the theoretical analysis.

关键词： multiple-input-multiple-oputput orthogonal frequency-division multiplexing integer frequency offset estimation

Polyelectrolytes of Inorganic Polyoxometalates:Prospecting New Charged Polymers for Advanced Applications

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Chinese Journal of Polymer Science 2024年第9期42卷 1254-1269,I0005页

作者： De-Yin Wang zhuo-Qun lu Wei Wang College of Medical Linyi UniversityLinyi276000China Center for Synthetic Soft Materials Key Laboratory of Functional Polymer Materials of the Ministry of EducationInstitute of Polymer ChemistryNankai UniversityTianjin300071China

Polyelectrolytes are charged polymers comprising macromolecules in which substantial portions of the constituent units contain cationic(e.g.,pyridinium,ammonium)or anionic(e.g.,sulfonate,carboxylate)groups,which possess special functions from the features of counterions,such as dissociation to charged species,mechanical stability,phase behavior,***,functional polyelectrolytes have been widely applied in many *** this perspective,we present some progresses in the studies of poly(polyoxometalate)s,denoted as poly(POM)s,as a kind of new charged polymers/polyelectrolytes,by covalent bonding between the inorganic polyoxometalate(POM)clusters and the organic polymer *** to the distinct positions of POMs in polymer chain and functions of poly(POM)s,they are divided into the following four categories:crosslinked poly(POM);side-chain poly(POM);backbone poly(POM),including poly(POM)-conjugated polymer hybrid and block poly(POM)-polymer;and POM-based covalent organic framework(PCOF).This perspective introduces the synthesis methods of poly(POM)polyelectrolytes and their macromolecular and aggregate structural characteristics,while also focusing on their properties and *** application areas include catalysis,thermal resistance,optical functions,fuel cells and batteries,etc.

关键词： Charged polymer Polyelectrolyte Polyoxometalate Poly(polyoxometalate) Covalent organic framework

Control of Codimension-2 Bautin Bifurcation in Chaotic Lü System

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Communications in Theoretical Physics 2009年第10期52卷 631-636页

作者： lu zhuo-Sheng DUAN Li-Xia School of Science Beijing University of Posts and Telecommunications Beijing 100876 China School of Science North China University of Technology Beijing 100041 China

In this paper, we design a feedback controller, and analytically determine a control criterion so as to control the codimension-2 Bautin bifurcation in the chaotic Lfi system. According to the control criterion, we determine a potential Bautin bifurcation region （denoted by P） of the controlled system. This region contains the Bautin bifurcation region （denoted by Q） of the uncontrolled system as its proper subregion. The controlled system can exhibit Bautin bifurcation in P or its proper subregion provided the control gains are properly chosen. Particularly, we can control the appearance of Bautin bifurcation at any appointed point in the region P. Due to the relationship between Bantin bifurcation and Hopf bifurcation, the control scheme thereby is also viable for controlling the creation and stability of the Hopf bifurcation. In the controller, there are two terms： a linear term and a nonlinear cubic term. We show that the former determines the location of the Hopf bifurcation while the latter regulates its criticality. We also carry out numerical studies, and the simulation results confirm our analyticai predictions.

关键词： lu system bifurcation control Bautin bifurcation Hopf bifurcation

Effect of magnetic flow and external forcing current on mixed bursting in the pre-Botzinger complex

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Chinese Physics B 2019年第11期28卷 120-128页

作者： Dou-Dou Guo zhuo-Sheng lu School of Science Beijing University of Posts and TelecommunicationsBeijing 100876China

The pre-B?tzinger complex(pre-B?tC) in mammalian brainstem is essential for the generation of respiratory *** dynamic studies on the pre-B?tC neuron have been focused on its firing activities modulated by the ion conductances rather than that by the electromagnetic radiation or the external forcing current. In this paper, by adding the electromagnetic radiation and external forcing current to Park and Rubin’s model, we mainly investigate the influences of those two factors on the mixed bursting(MB) of single pre-B?tC neuron. First, we explore how the variation of external forcing current affects the MB patterns of the system with non-vanishing magnetic flux. We classify the MB patterns and show their dynamic mechanism through fast-slow decomposition and bifurcation analysis. Then, by modifying the feedback coefficient, we further analyze the sole effect of electromagnetic radiation on the firing activities of the system. Our results may be instructive in understanding the dynamical behavior of pre-B?tC neuron.

关键词： pre-Botzinger complex mixed bursting magnetic flow dynamical analysis

Wronskian Form Solutions for a Variable Coefficient Kadomtsev-Petviashvili Equation

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Communications in Theoretical Physics 2014年第3期61卷 339-343页

作者： lu zhuo-Sheng REN Wen-Xiu School of Science Beijing University of Posts and Telecommunications Beijing 100876 China School of Science Inner Mongolia University of Technology Hohhot 010051 China

Starting from a simple transformation, and with the aid of symbolic computation, we establish the relationship between the solution of a generalized variable coefficient Kadomtsev–Petviashvili(vKP) equation and the solution of a system of linear partial differential equations. According to this relation, we obtain Wronskian form solutions of the vKP equation, and further present N-soliton-like solutions for some degenerated forms of the vKP equation. Moreover,we also discuss the influences of arbitrary constants on the soliton and N-soliton solutions of the KPII equation.

关键词： variable coefficient KP equation wronsian form solution multi-soliton-like solution symboliccomputation

Flow Injection Chemiluminescence Determination of Puerarin in Pharmaceutical Preparations Using Eosin Y-Fenton System

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Chinese Journal of Chemistry 2011年第6期29卷 1261-1267页

作者： Cai, zhuo Zhang, Xian lu, Dengfeng Gan, Jingni College of Chemistry and Chemical Engineering Guangxi University Nanning Guangxi 530004 China

A novel chemiluminescence （CL） system was established for the determination of puerarin in pharmaceutical preparations. It was shown that a strong CL signal was observed when Eosin Y reacted with the hydroxyl radicals which were generated from Fenton reagent in acidic medium. The CL intensity was decreased significantly when puerarin was added to the reaction system and partially scavenged the hydroxyl radicals in the solution. The extent of decrease in the CL intensity had a good stoichiometrical relationship with puerarin concentration. Based on this, a new method for the determination of puerarin using a flow injection chemiluminescence technique was developed. The experimental parameters that affected the CL intensity were optimized. Under the optimal conditions, the linear range for puerarin concentration was 8.0 × 10^-8--2.0 × 10^-6 mol/L （R = 0.9982） with a detection limit of 7.5 × 10^-9 mol/L （S/N= 3） and the relative standard deviation was method was applied to the determination of puerarin in a 1.7% for 4.0× 10^-7 mol/L puerarin （n= 11）. The proposed puerarin injection with satisfactory results.

关键词： flow injection chemiluminescence Eosin Y puerarin hydroxyl radical

Optimal training sequences for MIMO systems under correlated fading

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Journal of Systems Engineering and Electronics 2008年第1期19卷 33-38页

作者： Pang Jiyong Li Jiandong lu zhuo Zhao Linjing Chen Liang Broadband Wireless Communications Lab Information Science Inst. State Key Lab of Integrated Service Networks Xidian Univ. Xi'an 710071 P. R. China

The optimal design of training sequences for channel estimation in multiple-input multiple-output （MIMO） systems under spatially correlated fading is considered. The channel is assumed to be a block-fading model with spatial correlation known at both the transmitter and the receiver. To minimize the channel estimation error, optimal training sequences are designed to exploit full information of the spatial correlation under the criterion of minimum mean square error （MMSE）. It is investigated that the spatial correlation is helpful to decrease the estimation error and the proposed training sequences have good performance via simulations.

关键词： MIMO channel estimation training sequences spatial correlation minimum mean square error

Design of zero cross correlation variable weight codes for multimedia services based on magic square in SAC-OCDMA systems

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Optoelectronics Letters 2021年第9期17卷 539-545页

作者： lu zhuo lu Ye LI Chuanqi Optoelectronics and Optical Communication Laboratory School of Electronic EngineeringGuangxi Normal UniversityGuilin 541004China School of Physics and Electronics Nanning Normal UniversityNanning 530001China

A variable weight address code based on spectrum amplitude coding(SAC)is proposed for optical code division multiple access(OCDMA)networks to support different quality of service(Qo S)requirements of different *** zero cross-correlation magic square variable weight optical orthogonal code(ZMS-VWOOC)proposed in this paper has great flexibility in terms of code weight and number of *** cross-correlation can eliminate the influence of multiple access interference(MAI)and reduce the system *** results show that ZMS-VWOOC can provide better quality of service than similar *** results for a ZMS-VWOOC OCDMA network designed for triple-play services operating at 0.622 Gbit/s,2 Gbit/s,2.5 Gbit/s and 3 Gbit/s are considered.

关键词： Gbit/s OCDMA weight