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Superhydrophobic and corrosion-resistant siloxane-modified MgAl–LDHs coatings on magnesium alloy prepared under mild conditions

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International Journal of Minerals,Metallurgy and Materials 2025年第02期 450-463页

作者： Wenxi Zhang Zhangzelong Zhuo Dan Xu Liang Wu Zhihui xie Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province College of Chemistry and Chemical EngineeringChina West Normal University College of Materials Science and Engineering/National Engineering Research Center for Magnesium Alloys Chongqing University

We have developed a superhydrophobic and corrosion-resistant LDH-W/PFDTMS composite coating on the surface of Mg alloy. This composite comprised a tungstate-intercalated(LDH-W) underlayer that was grown at low temperature(relative to hydrothermal reaction conditions) under atmospheric pressure and an outer polysiloxane layer created from a solution containing perfluorodecyltrimethoxysilane(PFDTMS) using a simple immersion method. The successful intercalation of tungstate into the LDH phase and the following formation of the polysiloxane layer were confirmed through X-ray diffraction(XRD), Fourier transform infrared(FTIR) spectroscopy, and X-ray photoelectron spectroscopy(XPS). The corrosion resistance of the LDH-W film, both before and after the PFDTMS modification, was evaluated using electrochemical impedance spectroscopy(EIS), Tafel curves, and immersion experiments. The results showed that Mg coated with LDH-W/PFDTMS exhibited significantly enhanced corrosion protection compared to the unmodified LDHW film, with no apparent signs of corrosion after exposure to 3.5wt% NaCl solution for 15 d. Furthermore, the LDH-W/PFDTMS coating demonstrated superior superhydrophobicity and self-cleaning properties against water and several common beverages, as confirmed by static contact angle and water-repellency tests. These results offer valuable insights into preparing superhydrophobic and corrosion-resistant LDH-based composite coatings on Mg alloy surfaces under relatively mild reaction conditions.

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Modelling the Dropout Patterns of MOOC Learners

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Tsinghua Science and Technology 2020年第3期25卷 313-324页

作者： Zheng xie the College of Liberal Arts and Sciences National University of Defense Technology

We conduct a survival analysis for the viewing durations of massive open online *** hazard function of the empirical duration data presents as a bathtub curve with the Lindy effect in its *** understand the evolutionary mechanisms underlying these features,we categorize learners into two classes based on their different distributions of viewing durations,namely lognormal distribution and power law with exponential *** random differential equations are provided to describe the growth patterns of viewing durations for the two classes *** expected duration change rate of the learners featured by lognormal distribution is supposed to be dependent on their past duration,and that of the remainder of learners is supposed to be inversely proportional to *** to the equations predict the features of viewing duration distributions,and those of the hazard *** equations also reveal the features of memory and memorylessness for the respective viewing behaviors of the two classes.

关键词： data science applications in education distance education and online learning evaluation methodologies

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Spatial Sound——History, Principle,Progress and Challenge

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Chinese Journal of Electronics 2020年第3期29卷 397-416页

作者： xie Bosun Acoustic Laboratory School of Physics and Optoeletronics South China University of Technology

The aim of spatial sound or spatial audio is to reproduce the spatial information of sound,so as to recreate the desired spatial auditory events or perceptions. Recently, spatial sound becomes a hot topic in the fields of acoustics, signal processing, and communication. A series of spatial sound techniques have been developed and applied to a wide area of scientific research, engineering, and amusement. The history, principle, progress and applications of spatial sound technique are comprehensively reviewed in this article. Especially, spatial sound techniques based on different principles are united within the framework of spatial sampling and reconstruction theorem of sound *** challenges and prospects of spatial sound are also addressed.

关键词： Spatial hearing Spatial sound Sound reproduction

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Reviews of clean coal conversion technology in China:Situations & challenges

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Chinese Journal of Chemical Engineering 2021年第7期34卷 62-69页

作者： Kechang xie State Key Laboratory of Clean and Efficient Coal Utilization Key Laboratory of Coal Science and Technology(Taiyuan University of Technology)Ministry of EducationTaiyuan 030024China

It is important to develop the advanced coal to chemicals industry(ACCI)against a backdrop of coal-based energy structures,excessive imported oil and natural gas,and strict environmental constraints in *** this study,the technology and industry of China’s ACCI are reviewed to explain the effect of using coal to replace oil and natural gas,and the corresponding resource and environmental burdens that this will *** trends in technology and industry are also proposed to explore future *** review shows that although excellent progress has been made on an industrial scale,demonstrative level,and in terms of technology and equipment,the lack of strategic understanding,severe external constraints,partly underdeveloped technologies,and weak foundations must be immediately ***,it is necessary to clarify the importance that the ACCI has on the energy revolution and energy *** on technological innovation,a variety of external factors should be considered as a whole with emphasis on filling the knowledge gap of theoretical foundations and industry standards to support high-quality development for ACCI.

关键词： Advanced coal to chemicals industry Strategic understanding Clean energy

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Short Annealing:a Shortcut for Efficient Perovskite Solar Modules

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材料导报 2020年第20期34卷 20003-20004页

作者： xie Jiale Institute of Photovoltaics Southwest Petroleum UniversityChengdu 610500P.R.China

Photo of a minimodule and its electroluminescence in dark captured by an infrared responsive camera under a forward bias of 12 V.(b)The I-V curves of a small cell(8 mm 2)and a minimodule(21.5 cm 2)under AM1.5 illumination.(c)The efficiency of a minimodule under different illumination intensity.(d)The V OC of devices as a function of illumination intensity with perovskite films annealed for 3 min during an aging period of 0 days,3 days,9 days,and 20 days.(e)XRD patterns of perovskites annealed for 3 min and 20 min before and after aging.

关键词： aging illumination annealed

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Mass extinctions, their causes and consequences: an interview with Douglas *** and Shuzhong Shen

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National Science Review 2024年第1期11卷 66-70页

作者： Shucheng xie State Key Laboratory of Biogeology and Environmental Geology China University of Geosciences at Wuhan

‘Mass extinctions’ have been a hot topic for several decades. What triggers a mass extinction? How does a mass extinction impact the evolution of life? How does our ecosystem recover after a mass extinction? These questions attracted the interest of both scientists and the public *** spoke to two renowned researchers in the field of mass extinctions: Prof. Douglas H. Erwin from the National Museum of Natural History of the USA, and Prof. Shuzhong Shen from Nanjing University, China.

关键词： Stratigraphy

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一种基于自适应下垂系数的虚拟惯性控制策略

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电测与仪表 2021年第6期58卷 153-160页

作者：柴英博解璞陆军工程大学车辆与电气工程系石家庄050003

由于直流微网中元件的特性与采用的控制方法,其往往呈现出惯性小的特点。当负载突变时,电压也会发生剧烈变化。针对此问题,文中提出了一种改进的下垂控制方法,并将电压变化率引入下垂系数中,控制了蓄电池的充放电动作,使得微网在原有储... 详细信息

由于直流微网中元件的特性与采用的控制方法,其往往呈现出惯性小的特点。当负载突变时,电压也会发生剧烈变化。针对此问题,文中提出了一种改进的下垂控制方法,并将电压变化率引入下垂系数中,控制了蓄电池的充放电动作,使得微网在原有储能元件的基础上进一步增大了惯性。详细讨论了算法中的一些细节问题,在MATLAB/Simulink中搭建包含了光伏电池及蓄电池的多端直流微网,并进行仿真验证。结果表明,所提算法能够减轻由于负载突变带来的电压剧烈变化,具有有效性与可行性。

关键词：直流微网下垂控制虚拟惯性

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Multi-baseline phase unwrapping algorithm for INSAR

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Journal of Systems Engineering and Electronics 2013年第3期24卷 417-425页

作者： Xianming xie School of Information and Communication Guilin University of Electronic Technology

A novel multi-baseline phase unwrapping algorithm based on the unscented particle filter for interferometric synthetic aperture radar （INSAR） technology application is proposed. The proposed method is not constrained by the nonlinearity of the problem and is independent of noise statistics, and performs noise eliminating and phase unwrapping at the same time by combining with an unscented particle filter with a path-following strategy and an omni-directional local phase slope estimator. Results obtained from multi-baseline synthetic data and single-baseline real data show the performance of the proposed method.

关键词： interferometric aperture radar (INSAR) phase un- wrapping unscented particle filter.

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Enhanced multi-baseline unscented Kalman filtering phase unwrapping algorithm

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Journal of Systems Engineering and Electronics 2016年第2期27卷 343-351页

作者： Xianming xie School of Information and Communication Guilin University of Electronic Technology

This paper presents an enhanced multi-baseline phase unwrapping algorithm by combining an unscented Kalman filter with an enhanced joint phase gradient estimator based on the amended matrix pencil model, and an optimal path-following strategy based on phase quality estimate function. The enhanced joint phase gradient estimator can accurately and effectively extract the phase gradient information of wrapped pixels from noisy interferograms, which greatly increases the performances of the proposed method. The optimal path-following strategy ensures that the proposed algorithm simultaneously performs noise suppression and phase unwrapping along the pixels with high-reliance to the pixels with low-reliance. Accordingly, the proposed algorithm can be predicted to obtain better results, with respect to some other algorithms, as will be demonstrated by the results obtained from synthetic data.

关键词： multi-baseline phase unwrapping enhanced joint phase gradient estimator unscented Kalman filter

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Biological Systems:Reliable Functions out of Randomness

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Journal of Systems Science & Complexity 2021年第5期34卷 2036-2047页

作者： xie Liang-Liang University of Waterloo WaterlooOntarioCanada.Email:llxie@uwaterloo.ca.

What makes biological systems different from man-made systems?One distinction is explored in this paper:Biological systems achieve reliable functions through randomness,i.e.,by both mitigating and exploiting the effects of *** fundamental reason for biological systems to take such a random approach is the randomness of the microscopic world,which is dramatically different from the macroscopic world we are familiar *** substantiate the idea,bacterial chemotaxis is used as an example.

关键词： Bacterial chemotaxis biological systems feedback randomness reliable functions

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