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Synthesis of gold nanocubes/PEI-wrinkled CoSe_(2) nanomaterials and its application in electrochemical immunosensors for detection of dipropyl phthalate

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Rare Metals 2021年第5期40卷 1099-1109页

作者： Bao-Shan he Jia-wen Li School of Food Science and Technology Henan University of TechnologyZhengzhou 450001China

CoSe_(2) nanosheet materials with a wrinkled sheet structure and large surface area were synthesized via a simple hydrothermal *** polyethyleneimine(PEI)was used to functionalize wrinkled CoSe_(2)(w-CoSe_(2))to make gold nanocubes(AuNCs)uniformly anchored onto the surface of PEI-w-CoSe_(2) via Au-N *** its application in electrochemical immunosensors for the detection of dipropyl phthalate(DPrP)was *** obtained material was characterized by the Fourier transform infrared spectroscopy(FTIR),transmission electron microscope(TEM),energydispersive spectroscopy(EDS),X-ray diffraction(XRD)and Raman *** effective surface area and conductivity of the electrode were enhanced by the introduction of AuNCs/PEI-w-CoSe_(2) *** voltammetry(CV),differential pulse voltammetry(DPV)and electrochemical impedance spectroscopy(EIS)were used to characterize the performance of *** DPrP binds to antibodies via the antigen-antibody interaction,[Fe(CN)6]3-/4-was used as a signal probe to monitor the change of oxidation current of different DPrP *** optimal conditions,the electrochemical responses of the prepared immunosensor were linear when the DPrP concentrations ranged from 1×10^(-11) to 1×10^(-5) mol·L-1,with a detection limit of 1.39×10^(-12) mol·L^(-1).The coefficient of determination(R2)is 0.995,indicating that the degree of fitting is ***,the constructed immunosensor exhibited acceptable reproducibility,selectivity,and ***,it may be found that the composite material has good application prospects in the electrochemical sensors field.

关键词： CoSe_(2)nanosheets Polyethyleneimine Gold nanocubes Dipropyl phthalate

A quasi-zero-stiffness isolator with a shear-thinning viscous damper

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Applied Mathematics and Mechanics(English Edition) 2022年第3期43卷 311-326页

作者： Guilin wen Yu LIN Junfeng he School of Mechanical and Electrical Engineering Guangzhou UniversityGuangzhou 510006China School of Mechanical Engineering Yanshan UniversityQinhuangdao 066004Hebei ProvinceChina

Quasi-zero-stiffness(QZS)vibration isolators have been widely studied,because they show excellent high static and low dynamic stiffnesses and can effectively solve low-frequency and ultralow-frequency ***,traditional QZS(T-QZS)vibration isolators usually adopt linear damping,owing to which achieving good isolation performance at both low and high frequencies is difficult.T-QZS isolators exhibit hardening stiffness characteristics,and their vibration isolation performance is even worse than that of linear vibration isolators under a large excitation ***,this study proposes a QZS isolator with a shear-thinning viscous damper(SVD)to improve the vibration isolation performance of the T-QZS *** force-velocity relation of the SVD is obtained,and a dynamic model is established for the *** dynamic responses of the system are solved using the harmonic balance method(HBM)and the Runge-Kutta *** vibration isolation performance of the system is evaluated using force transmissibility,and the isolator parameters are *** results show that compared with the T-QZS isolators,the proposed QZS-SVD isolator achieves the lower initial vibration isolation frequency and peak value,and exhibits better vibration isolation performance at medium and high ***,the proposed isolator can withstand a large excitation amplitude in the effective vibration isolation range.

关键词： quasi-zero-stiffness(QZS)isolator shear-thinning viscous damper(SVD) vibration isolation force transmissibility

Multi-cell massive MIMO transmission with coordinated pilot reuse

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Science China(Technological Sciences) 2015年第12期58卷 2186-2194页

作者： ZHONG wen you Li LIAN TengTeng GAO XiQi National Mobile Communications Research Laboratory Southeast University

In this paper, we propose a coordinated pilot reuse(CPR) approach to reduce the pilot overhead for multi-cell massive multi-input multi-output transmission. Unlike the conventional multi-cell pilot reuse approach in which pilots can only be reused among different cells, the proposed CPR approach allows pilots to be reused among both inter-cell and intra-cell user equipments, and thus, pilot overhead can be efficiently reduced. For spatially correlated Rayleigh fading channels, we first present a CPR-based channel estimation method and a low complexity pilot allocation algorithm. Because CPR might lead to additional pilot interference, we develop a statistically robust uplink receiver and downlink precoder that takes channel estimation errors into account. The proposed uplink receiver and downlink precoder are robust to channel state information inaccuracy, and thus, can guarantee a certain transmission performance. Monte-Carlo simulations illustrate the significant performance improvement in net spectral efficiency offered by the proposed CPR approach.

关键词： pilot overhead multi-cell massive MIMO coordinated pilot reuse robust transceiver net spectral efficiency

Numerical Research on the Cold Start-up Strategy of a PEMFC Stack from-30℃

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Journal of Thermal Science 2023年第3期32卷 898-910页

作者： LEI Le he Pu he Peng TAO wen-quan Shaanxi Collaborative Innovation Center for PEMFC Performance Improvement Key Laboratory of Thermal Fluid Science and Engineering of MOESchool of Energy and Power EngineeringXi’an Jiaotong UniversityXi'an 710049China

The cold start-up of the PEMFC(proton exchange membrane fuel cell)stack from sub-zero temperature is considered one of the significant obstacles to its expansive commercial *** the cold start-up process,with the progress of hydrogen/oxygen chemical reaction,the produced water will freeze into ice,occupying the pores of the porous electrode,thus leading to a rapid deterioration of output performance and even making the cold start-up *** this work,a one-dimensional numerical model is adopted to study a cold start-up process of the PMEFC stack starting from-30℃.The stepwise-changed current loading mode is employed in the *** assisted preheating method is used to explore an optimal operating condition for a successful cold *** numerical results are validated by comparing the numerical result with the experimental data in reference,and they agree with the experimental data very *** results show that the optimal heating power in the studied range is 100 *** the initial current slope increased,the current peak value increased,but the cold start-up process ***,the start-up time and ice volume fraction are highly dependent on the initial current *** optimal initial current slope is 0.7 A/***,a higher initial current slope will cause a significant inner ohmic *** resistance of CLa(catalyst layer of the anode)is the key and primary part of the total ohmic *** details of the research and the analyzed results will help design the cold start-up strategy for the PEMFC stack start-up from-30℃.

关键词： cold start-up IPEMFCstack stepwise-changed current loading mode preheating

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克尔凯郭尔与卢卡奇马克思主义哲学观的流变

武汉大学学报（哲学社会科学版） 2025年第1期78卷 77-85页

作者：温权武汉大学马克思主义学院湖北武汉430072

克尔凯郭尔并非卢卡奇偶然提及的学术注脚,而是其理解马克思的背景支援。卢卡奇在不同时期都对克尔凯郭尔作了选择性评述,并将其接受或重构马克思主义哲学的曲折心路历程逐一呈现:通过质疑克尔凯郭尔在人与世界相统一问题上遭遇的“审... 详细信息

克尔凯郭尔并非卢卡奇偶然提及的学术注脚,而是其理解马克思的背景支援。卢卡奇在不同时期都对克尔凯郭尔作了选择性评述,并将其接受或重构马克思主义哲学的曲折心路历程逐一呈现:通过质疑克尔凯郭尔在人与世界相统一问题上遭遇的“审美—伦理”悖论,青年卢卡奇从心灵掘进到阶级意识,将“主体—总体”辩证图式看作马克思的认识论地平,由此创作出《历史与阶级意识》;之后,为回应该书引起的争议,盛年的卢卡奇以批判克尔凯郭尔的非理性主义为契机,尝试清除“主体—总体”辩证图式中残余的主体形而上学痕迹,开始在方法论维度正视生产实践与经济规律间的有机联系;及至晚年,当卢卡奇立足社会存在,抨击克尔凯郭尔有关主体优先性的宗教幻象时,他又把社会性的“自在—自为”运动内嵌于人性的“主体—总体”辩证图式,并根据超然的悟性,默认马克思主义哲学是将经济规律置于从属地位的劳动本体论,再度退回《历史与阶级意识》的主体形而上学谋划。不难看出,在卢卡奇臧否克尔凯郭尔与马克思的“主体—总体”辩证桥段中,当事人对“人之实然性和应然性的现实统一”问题所秉持的龃龉心态暴露无遗。这也恰好说明,卢卡奇一生都徘徊于正统的马克思主义与人道的马克思主义之间。

关键词： “主体—总体”辩证图式克尔凯郭尔卢卡奇《历史与阶级意识》