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Modulation of ionic arrangement in polar magnet by chemical pressure

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Chinese Chemical Letters 2023年第3期34卷 502-506页

作者： Shuang Zhao Jinjin Yang Yifeng Han Meixia Wu man-rong Li Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education School of ChemistrySun Yat-sen UniversityGuangzhou 510006China Institute of Semiconductors Guangdong Academy of SciencesGuangzhou 510650China

The similarity of local structure-connection pattern and volumetrically compressive strain between host and guest phases can be used to stabilize heteroid metastable matter and tune the local structure and *** a series of metastable ABO_(3)(A=Mn;B=Mn_(0.5)Mo_(0.5),Mn_(1/3)Ta_(2/3),and Mn_(0.5)Ta_(0.5)) were trapped in LiTaO_(3) to form solid-solutions,where the difference of solid solubility limit reveals the barrier of size effect on chemical *** samples show antiferromagnetic characters,in which the(LiTaO_(3))_(1-x)-[Mn(Mn_(0.5)Mo_(0.5))O_(3)]_(x) series exhibit more complex magnetic and dielectric behaviors with the increasing of metastable guest phase,stemming from the complex interactive mechanism between Mn^(2+)and Mo^(6+).The cell parameter variation of (LiTaO_(3))_(1-z)-[Mn(Mn_(0.5)Ta_(0.5))O_(3)]_zshows a more regularly changing tendency,on account of the smallest size *** findings show that chemical pressure can effectively stimulate the physical pressure to intercept and modulate a metastable phase at atomic-scale by compressibility effect between like structures at ambient pressure.

关键词： Chemical pressure Trapping metastable-phase Cationic arrangement Antiferromagnetism Dielectricity

Formation of Vacancy-Type Dislocation Loops in Hydrogen-Ion-Implanted Fe–Cr Alloy

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Acta Metallurgica Sinica(English Letters) 2019年第5期32卷 566-572页

作者： Yu-Feng Du Li-Juan Cui Wen-Tuo Han Fa-rong wan Department of Materials Physics and Chemistry School of Materials Science and Engineering University of Science and Technology

Fe-10 at.%Cr alloy was implanted with hydrogen ions at room temperature, followed by annealing at high *** annealing process made the defects develop into large dislocation loops. The nature of the dislocation loops formed after annealing was studied by the evolution of loops under in situ electron irradiation in high-voltage electron *** indicated that only interstitial-type loops were observed when annealed at 550 °C and below, but vacancy-type loops started to form at the temperature higher than 600 °C. According to the previous study of our group, the presence of chromium element made the formation temperature of vacancy-type loops higher than that in pure iron. The effect of alloying elements on the formation temperature of the vacancy-type loops was discussed.

关键词： Hydrogen implantation Interstitial-type loops Vacancy-type loops Fe–Cr alloy High-voltage electron microscope

An Analytical Solution for Wave Transformation Over Axi-Symmetric Topography

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China Ocean Engineering 2019年第6期33卷 694-703页

作者： CUONG San Sieu CHANG Jen-Yi TSAI Chia-Cheng CHOU wan-rong aInstitute of Oceanography National Taiwan UniversityTaipei 10617China Tainan University of Technology Tainan 71002China Department of Marine Environmental Engineering National Kaohsiung University of Science and TechnologyKaohsiung 81164China Department of Marine Environment and Engineering National Sun Yat-Sen UniversityKaohsiung 80424China Department of Hydraulic and Ocean Engineering National Cheng Kung UniversityTainan 701China

The present study considers wave scattering phenomena around a cylindrical island mounted on a general axisymmetric topography or a general submerged truncated axi-symmetric shoal based on the mild-slope equation. The method of separation of variables and Taylor series expansion are invoked to find the approximate solution to the variable water depth region which varies proportionally to an arbitrary power of radial distance. Validations against the solutions for the combined wave refraction and diffraction around a cylindrical island mounted on a paraboloidal shoal of Liu et al. in 2004 and the scattering and trapping of wave energy by a submerged truncated paraboloidal shoal of Lin and Liu in 2007 show excellent agreements as the power of radial distance being equal to two. For the solutions of wave refraction and diffraction around a cylindrical island mounted on a shoal with depth proportionally to an arbitrary power of radial distance, good agreements with Zhai et al.’s(2013) solutions are demonstrated. Since the robustness of the assumption of a general axi-symmetric geometry based on an arbitrary power variability of the radial distance, the present solution can be very conveniently employed to investigate the effects of bottom topography on wave scattering and trapping patterns.

关键词： general axi-symmetric topography mild-slope equation submerged truncated shoal wave refraction wave diffraction

Analysis of Oxides Formed on the Surface of the Alloy 690 in Hydrogenated Supercritical Water

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Acta Metallurgica Sinica(English Letters) 2016年第8期29卷 774-781页

作者： Jin Gao Fa-rong wan Guo-ping Cao Kumar Sridharan Todd Allen School of Materials Science and Engineering University of Science and Technology Beijing Department of Materials Science and Engineering University of Wisconsin-Madison

The oxides formed on the surface of the alloy 690 in hydrogenated supercritical water at 400℃ for 1000 h were investigated using scanning electron microscopy,transmission electron microscopy,scanning transmission electron microscopy and energy-dispersive X-ray *** oxides on me surface of the alloy 690 exhibited multi-layer structure：an outer layer consisted of granular crystallites（NiO and NiFe_2O_4） and a compact inner layer（spinel and Cr_2O_3）.Chemical analysis indicated that the outer layer was enriched in nickel but depleted in chromium,whereas the inner layer was enriched in chromium and iron but depleted in *** inner layer was also characterized as layered structure by Fe-rich spinel on top of continuous Cr_2O_3 ***,Cr_2O_3 nodules were readily observed at the oxides/alloy interface.

关键词： Alloy 690 Supercritical water Oxides Corrosion

Conductive Metal/Covalent Organic Frameworks for CO_(2) Electroreduction

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Chinese Journal of Structural Chemistry 2022年第5期41卷 1-14页

作者： Chang-Pu wan Jun-Dong Yi rong Cao Yuan-Biao Huang State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China University of Chinese Academy of Sciences Beijing 100049China School of Chemistry and Materials Science Collaborative Innovation Center of Chemistry for Energy Materials(iChEM)University of Science and Technology of ChinaHefei 230026China Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou 350108China

Porous crystalline metal-organic frameworks(MOFs)and covalent organic frameworks(COFs)are promising platforms for electrocatalytic reduction of CO_(2)(CO_(2)RR)due to their large CO_(2)adsorption uptakes and periodically arranged single active ***,the applications in CO_(2)RR of the traditional MOFs and COFs are greatly limited by their low electron *** recent years,numerous types of MOFs and COFs with high intrinsic conductivity have been rationally designed and successfully constructed,and some of them have been applied in CO_(2)*** this review,the applications of conductive MOFs and COFs in CO_(2)RR have been *** conductive MOFs and COFs can be categorized according to the methods,in which the conductivity is enhanced,such as constructing fullyπ-conjugated backbones,donor-acceptor heterojunction,enhancing theπ-πstacking interactions between organic moieties and/or the introduction of guest molecules.

关键词： metal-organic frameworks covalent organic frameworks CO_(2)electroreduction reaction conductive frameworks

Characteristics of the recirculation zone in a cylindrical confined space and its suppression by an annular orifice plate

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Building Simulation 2023年第8期16卷 1391-1408页

作者： Yu Zhou wan-rong Ren Mengfan Quan Lei Jia manning wang Yi wang State Key Laboratory of Green Building in Western China Xi'an University of Architecture and TechnologyXi'an 710055China School of Building Services Science and Engineering Xi’an University of Architecture and TechnologyNo.13 Yanta RD.Xi’an 710055China

The accumulation of pollutants in the recirculation zone can worsen *** is critical to reduce recirculation zones to improve the ventilation efficiency of ***,the variation rule of the recirculation zone in a cylindrical confined space(CCS)is unclear,and there are few solutions to suppress or eliminate the recirculation zone at *** this paper,an annular deflector orifice plate for suppressing the recirculation zone was developed based on the structural characteristics of the *** device is simple in structure and can be used *** experiments and numerical simulations,the variation rule of the recirculation zone length and the influence of structural parameters of the device on the vortex suppression were ***,empirical formulas for calculating the length of the recirculation zone in the CCS were *** addition,it was proved that placing the annular orifice plate inside the CCS effectively reduced the recirculation zone and improved the ventilation *** to the system without the annular orifice plate,the dimensionless length of the recirculation zone was decreased by 76.3%,and the time to completely discharge the pollutants from the CCS was decreased by 16.7%.Finally,parameters of the annular orifice plate that form the best vortex suppression effect were proposed:the porosity range was 40%–50%,uniform in shape with equal ring spacing,and placed more than one inlet diameter away from the *** results help guide the ventilation design of CCS.

关键词： cylindrical confined space recirculation zone vortex suppression orifice plate

Molecular Simulations in Macromolecular Science

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Chinese Journal of Polymer Science 2023年第9期41卷 1361-1370,I0005页

作者： Duo Xu Hai-Xiao wan Xue-rong Yao Juan Li Li-Tang Yan State Key Laboratory of Chemical Engineering Department of Chemical EngineeringTsinghua UniversityBeijing100084China Beijing Research Institute of Chemical Industry SINOPECBeijing100013Chin

Molecular simulations are now an essential part of modern chemistry and physics,especially for the investigation of *** have evolved into mature approaches that can be used effectively to understand the structure-to-property relationships of diverse macromolecular *** this article,we provide a tutorial on molecular simulations,focusing on the technical and practical *** prominent and classical simulation methods and software are *** applications of molecular simulations in various directions of macromolecular science are thenfeatured by representative systems,including self-assembly,crystallization,chemical reaction,and some typical non-equilibrium *** tutorial paper provides a useful overview of molecular simulations in the rapid progress of macromolecular science,and suggests guidance for researchers who start exploiting molecular simulations in their study.

关键词： Molecular simulation Coarse-grained molecular dynamics Multi-scale method Polymer physics

High-cycle fatigue behavior of Co-based superalloy 9CrCo at elevated temperatures

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Chinese Journal of Aeronautics 2016年第5期29卷 1405-1413页

作者： wan Aoshuang Xiong Junjiang Lyu Zhiyang Li Kuang Du Yisen Chen Kejiao man Ziyu School of Transportation Science and Engineering Beihang University

A modified model is developed to characterize and evaluate high-cycle fatigue behavior of Co-based superalloy 9CrCo at elevated temperatures by considering the stress ratio effect. The model is informed by the relationship surface between maximum nominal stress, stress ratio and fatigue life. New formulae are derived to deal with the test data for estimating the parameters of the proposed model. Fatigue tests are performed on Co-based superalloy 9CrCo subjected to con- stant amplitude loading at four stress ratios of -1, -0.3, 0.5 and 0.9 in three environments of room temperature （i.e., about 25 ℃） and elevated temperatures of 530 ℃ and 620 ℃, and the interaction mechanisms between the elevated temperature and stress ratio are deduced and compared with each other from fractographic studies. Finally, the model is applied to experimental data, demonstrating the practical and effective use of the proposed model. It is shown that new model has good correlation with experimental results.

关键词： Elevated temperature Fatigue Metals and alloys SEM Stress ratio

Advances in mobility enhancement of ITZO thin-film transistors:a review

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Journal of Semiconductors 2023年第9期44卷 11-25页

作者： Feilian Chen Meng Zhang Yunhao wan Xindi Xu man Wong Hoi-Sing Kwok College of Electronic and Information Engineering Shenzhen UniversityShenzhen 518060China Institute of Microscale Optoelectronics(IMO) Shenzhen UniversityShenzhen 518060China State Key Laboratory of Advanced Displays and Optoelectronics Technologies The Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina

Indium-tin-zinc oxide(ITZO)thin-film transistor(TFT)technology holds promise for achieving high mobility and offers significant opportunities for *** paper provides a review of progress made in improving the mobility of ITZO *** paper begins by describing the development and current status of metal-oxide TFTs,and then goes on to explain the advantages of selecting ITZO as the TFT channel *** evaluation criteria for TFTs are subsequently introduced,and the reasons and significance of enhancing mobility are *** paper then explores the development of high-mobility ITZO TFTs from five perspectives:active layer optimization,gate dielectric optimization,electrode optimization,interface optimization,and device structure ***,a summary and outlook of the research field are presented.

关键词： thin-film transistor(TFT) indium-tin-zinc oxide(ITZO)TFT mobility active matrix(AM)displays