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Spontaneous polarization enhanced bismuth ferrate photoelectrode:fabrication and boosted photoelectrochemical water splitting property

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Frontiers in Energy 2021年第3期15卷 781-790页

作者： Yan ZHANG yukun ZHU Yanhua PENG Xiaolong YANG Jian liu Wei JIAO Jianqiang yu School of Chemistry and Chemical Engineering Qingdao UniversityQingdao 266071China State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China Laboratory of Clean Energy Chemistry and Materials Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China

In this paper,the fabrication of a highly orientated Bi_(2)Fe_(4)O_(9)(BFO)photoelectrode in the presence of two-dimensional(2D)graphene oxide(GO)was *** was found that the GO can be used as a template for controlling the growth of BFO,and the nanoplate composites of BFO/reduced graphene oxide(RGO)with a high orientation can be *** thickness of the nanoplates became thinner as the ratio of GO *** a result,the ferroelectric spontaneous polarization unit arranges itself in the space in a periodic manner,leading to the formation of a polarization field along a special ***,the created built-in electric field of the nanoplate composites of BFO/RGO is improved upon the increase of the amount of *** expected,carrier separation is enhanced by the built-in electric field,therefore substantially enhancing the photoelectrochemical(PEC)activity of water splitting compared to pure BFO under the irradiation of visible-light.

关键词： bismuth ferrate ferroelectric polarisation photoelectrochemical(PEC)water splitting graphene oxide(GO) high orientation

The coupling effect characterization for van der Waals structures based on transition metal dichalcogenides

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Nano Research 2021年第6期14卷 1734-1751页

作者： Baishan liu Junli Du Huihui yu Mengyu Hong Zhuo Kang Zheng Zhang yue Zhang Beijing Advanced Innovation Center for Materials Genome Engineering Beijing Key Laboratory for Advanced Energy Materials and TechnologiesUniversity of Science and Technology BeijingBeijing100083China State Key Laboratory for Advanced Metals and Materials School of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing100083China

van der Waals(vdW)heterostructures based on two-dimensional(2D)materials holding design-by-demand features offer astonishing opportunities to construct novel electronics and optoelectronics devices due to the vdW force interaction between their stacked *** the atomically thin confinement,vdW heterostructure not only exhibits unprecedented properties as an entire counterpart,but also provides unique platforms to manipulate the vdW interfacial ***,developing characterization techniques to comprehensively understand the coupling effect on structure-property-performance relationship of vdW heterostructures is crucial for fundamental science and practical ***,we focus on the most widely studied 2D semiconductor transition metal dichalcogenides(TMDCs)and systematically review significant advances in characterizing the material and interfacial coupling effect of the related vdW ***,we will discuss microscopy techniques for unveiling the structure-property relationship of vdW heterostructures and optical spectroscopy measurements for analyzing vdW interfacial coupling ***,we address some promising strategies to optimize characterization technologies for resolving vdW heterostructures,including coupling multiple characterization technologies,improving temporal and spatial resolution,developing fast,efficient,and non-destructive techniques and introducing artificial intelligence.

关键词： van der Waals heterostructures transition metal dichalcogenide materials structure-property characterization interfacial behaviors microscopy techniques optical spectroscopy techniques

Food-derived protein hydrolysates and peptides:anxiolytic and antidepressant activities,characteristics,and mechanisms

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Food Science and Human Wellness 2024年第3期13卷 1168-1185页

作者： Wenhui Li yu Xi Junru Wang Yinxiao Zhang He Li Xinqi liu Beijing Advanced Innovation Center for Food Nutrition and Human Health Beijing Engineering and Technology Research Center of Food AdditivesNational Soybean Processing Industry Technology Innovation CenterBeijing Technology and Business UniversityBeijing 100048China

Globally,the prevalence of anxiety and depression has reached epidemic ***-derived protein hydrolysates and peptides delivered through dietary supplementation can avoid the negative risks associated with traditional pharmaceuticals while delivering superior anxiolytic and antidepressant *** review summarizes current research on food-derived anxiolytic and antidepressant protein hydrolysates and peptides,and subsequently analyses their physicochemical characteristics and elaborates on their *** aim of this work is to contribute to the in-depth study and provide a theoretical foundation for the development of related products to better serve patients with anxiety and depression.

关键词： Anxiolytic Antidepressant Peptides Protein hydrolysates Neurotransmitter

Fluorine-containing polyimide nanofiber membranes for durable and anti-aging daytime radiative cooling

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Journal of Materials Science & Technology 2024年第12期179卷 166-173页

作者： Qiaoran Zhang Tiantian Xue Yang Lu Lei Ma Dingyi yu Tianxi liu Wei Fan Key Laboratory of Synthetic and Biological Colloids Ministry of EducationSchool of Chemical and Material EngineeringJiangnan UniversityWuxi 214122China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China

Personal daytime radiative cooling(PDRC)materials have high sunlight reflection and high selective emis-sivity to outer space in the main atmospheric window,demonstrating huge potential in energy-saving for sustainable ***,polymer-based membranes for radiative cooling have been widely re-ported,due to their easy processing,low cost,and unique optical ***,the desired high sunlight reflectance of PDRC materials is easily dampened by environmental aging,high temperature,and ultraviolet(UV)irradiation,resulting in reduced cooling performance for most polymers,adverse to large-scale practical *** this work,we demonstrate a novel polyimide nanofiber(PINF)membrane with a fluorine-containing structure via typical electrospinning *** resultant PINF membrane exhibits high sunlight reflectance,UV resistance,and excellent thermal stability,rendering anti-aging day-time radiative *** sunlight reflectance of PINF membranes could maintain constant in the aging test for continuous 720 h under outdoor solar irradiation,exhibiting durable and long-term personal day-time radiative cooling performance.

关键词： Polyimide Nanofiber UV resistance Daytime radiative cooling

Numerical analysis on combustion characteristics of hybrid rocket motor with star-tube segmented grain

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Chinese Journal of Aeronautics 2023年第12期36卷 102-112页

作者： Chengen LI Zongwei WANG Jin YANG Jinpeng JIANG Fan GONG Zhu liu yu SUN Science and Technology on Space Physics Laboratory Beijing 100076China

A method of star-tube combined segmented grain is proposed to improve the combustion performance of hybrid rocket *** star-tube combined segmented grain consists of a single-port star part and a single-port tube part.A mid-chamber forms between the fore-grain and the aft-grain for better mixing *** single-port feature gives hybrid rocket motor several advantages,such as simple structure,high reliability,and variable *** paper is mainly aimed at studying the combustion characteristics of hybrid rocket motor with star-tube segmented grain through three-dimensional steady *** performance of the motors with different segmented grain combinations,including fore-tube/aft-tube,fore-tube/aftstar,fore-star/aft-star and fore-star/aft-tube,is contrastively *** motor in this paper adopts polyethylene and 90%hydrogen peroxide as the *** reveal that segmented grain with different-type grain combinations could greatly change the flow field in the second half of the combustion *** of the flow field is beneficial to the mixing between the fuel and the oxidizer,and it could increase the fuel regression rate and the combustion *** turbulence effect of tube aft-grain is better than that of star *** the four segmented grain combinations,the combination of star fore-grain and tube aft-grain is the preferred method with optimal overall *** grain configuration could increase the regression rate of tube aft-grain to surpass that of star aft-grain in other ***,hybrid rocket motor with this grain configuration achieves the highest combustion efficiency.

关键词： Combustion performance Flow fields Fluid-solid coulping Hybrid rocket motor Star-tube segmented grain

Experimental and modeling study of surface topography generation considering tool-workpiece vibration in high-precision turning

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Chinese Journal of Aeronautics 2023年第7期36卷 194-212页

作者： Xingying ZHOU Henan liu Tianyu yu Ruiyang GUO Guangzhou WANG Yazhou SUN Mingjun CHEN State Key Laboratory of Robotics and System Harbin Institute of TechnologyHarbin 150001China School of Mechatronics Engineering Harbin Institute of TechnologyHarbin 150001China

High-precision turning(HPT)is a main processing method for manufacturing rotary high-precision components,especially for metallic ***,the generated vibration between tool tip and workpiece during turning may seriously deteriorate the surface ***,exploring the effect of vibration on turning surface morphology and quality of copper parts using 3D surface topography regeneration model is crucial for predicting HPT *** developed model can update the machined surface topology in real *** this study,the effects of tool arc radius,feed rate,radial vibration,axial vibration and tangential vibration on the surface topography and surface roughness were *** results show that the effect of radial vibration on surface topography is greater than that of axial vibration and tangential *** radial vibration frequency is also *** vibration frequency changes,the surface topography profile presents three different types:the standard sinusoidal curve,the sinusoidal curve whose lowfrequency signal envelopes high-frequency signal,and the oscillation curve whose low-frequency signal superimposes high-frequency *** addition,HPT experiment was carried out to validate the developed *** surface roughness obtained in the experiment was Ra=53 nm,while the roughness obtained by the simulation was Ra=46 nm,achieving a prediction accuracy of 86.7%.Received 4 September 2022;revised 3 October 2022;accepted 17 October 2022.

关键词： High-precision turning Machining vibration Modeling Surface roughness Surface topography

Craniofacial therapy:advanced local therapies from nano-engineered titanium implants to treat craniofacial conditions

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International Journal of Oral Science 2023年第1期15卷 33-49页

作者： Karan Gulati Chengye Ding Tianqi Guo Houzuo Guo Huajie yu Yan liu The University of Queensland School of DentistryHerstonQLDAustralia Laboratory of Biomimetic Nanomaterials Department of OrthodonticsPeking University School and Hospital of StomatologyBeijingChina National Center for Stomatology&National Clinical Research Center for Oral Diseases&National Engineering Laboratory for Digital and Material Technology of Stomatology&Beijing Key Laboratory of Digital Stomatology&Research Center of Engineering and Technology for Computerized Dentistry Ministry of Health&NMPA Key Laboratory for Dental Materials BeijingChina Department of Oral Implantology Peking University School and Hospital of StomatologyBeijingChina Fourth Clinical Division Peking University School and Hospital of StomatologyBeijingChina

Nano-engineering-based tissue regeneration and local therapeutic delivery strategies show significant potential to reduce the health and economic burden associated with craniofacial defects,including traumas and *** to the success of such nano-engineered non-resorbable craniofacial implants include load-bearing functioning and survival in complex local trauma ***,race to invade between multiple cells and pathogens is an important criterion that dictates the fate of the *** this pioneering review,we compare the therapeutic efficacy of nano-engineered titanium-based craniofacial implants towards maximised local therapy addressing bone formation/resorption,soft-tissue integration,bacterial infection and cancers/*** present the various strategies to engineer titanium-based craniofacial implants in the macro-,micro-and nano-scales,using topographical,chemical,electrochemical,biological and therapeutic modifications.A particular focus is electrochemically anodised titanium implants with controlled nanotopographies that enable tailored and enhanced bioactivity and local therapeutic ***,we review the clinical translation challenges associated with such *** review will inform the readers of the latest developments and challenges related to therapeutic nano-engineered craniofacial implants.

关键词： implants titanium local

Fractional crystallization processes of magma beneath the Carlsberg Ridge(57°–65°E)

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Journal of Oceanology and Limnology 2020年第1期38卷 75-92页

作者： ZONG Tong HAN Xiqiu liu Jiqiang WANG Yejian QIU Zhongyan yu Xing Key Laboratory of Submarine Geosciences and Prospection of Ministry of Education Ocean University of ChinaQingdao 266100China Key Laboratory of Submarine Geosciences State Oceanic Administration&Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China Ocean College Zhejiang UniversityZhoushan 316021China School of Oceanography Shanghai Jiaotong UniversityShanghai 200030China

Fractional crystallization of basaltic magma at variable depths influences strongly the geochemical compositions of mid-ocean ridge basalts(MORBs),especially at slow-spreading mid-ocean *** Carlsberg Ridge is a typical slow-spreading ridge located in the northwestern Indian *** this study,we conducted petrological,geochemical and modelling studies of MORBs collected along the Carlsberg Ridge from 57°-65°E to understand the fractional crystallization processes of magma and the controls on variations in MORB *** results show that the mantle sources beneath the Carlsberg Ridge are heterogeneous even on the local scale of a segment;such heterogeneity may be ubiquitous beneath the Carlsberg *** heterogeneity may be caused by the enriched components resulting in the"DUPAL"anomaly,whereas the effect of pyroxenite on mantle heterogeneity is *** parental melts experienced crystallization of olivine,plagioclase and clinopyroxene prior to eruption,which played a significant role in the major and trace element variations in MORBs from the Carlsberg *** liquid lines of descent(LLDs),deduced from the forward modelling of three parental magma compositions using the Petrolog3 program at pressures between 1 atm and 10 kbar,demonstrate that clinopyroxene joined the olivine and plagioclase *** over-enrichment in highly incompatible elements relative to LLDs may be caused by the processes of replenishment-tapping-crystallization in magma *** calculated crystallization pressures suggest that parental magmas beneath the Carlsberg Ridge experienced moderateto high-pressure crystallization and that crystallization beneath the slow-spreading Carlsberg Ridge may start at upper mantle depths.

关键词： fractional crystallization crystallization pressure mantle heterogeneity Carlsberg Ridge mid-ocean ridge basalt (MORB)

Radio-Acoustic Integrated Network for Ocean Information Transmission:Framework and Enabling Technologies

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China Communications 2021年第9期18卷 62-70页

作者： Fangjiong Chen Zilong Jiang Fei Ji Hua yu Quansheng Guan Feng liu School of Electronic and Information Engineering South China University of TechnologyGuangzhou 510640China The Key Laboratory of Marine Environmental Survey Technology and Application Ministry of Natural ResourcesGuangzhou 510300China College of Information Engineering Shanghai Maritime UniversityShanghai 201306China

An important vision of next generation mobile system is to provide global internet *** Space-Terrestrial Integrated Network(STIN)has been proposed and intensively studied to tackle this *** to the severe attenuation of radio signals in water,the STIN cannot be directly applied in underwater *** this paper we envision a framework of integrated radio-acoustic network arming at high-efficient data transmission in underwater scenarios,where acoustic signal is for underwater communication and radio signal is for surface and air *** radio links have much higher data transmission rate and lower delay,in the integrated radio-acoustic network,the acoustic links easily become congested,at the same time the radio links are not fully *** therefore propose that the integrated radio-acoustic network should be properly designed to minimize the hop count of acoustic links,as well as the signaling overhead in the acoustic *** then present a novel network framework and the relative technologies to help moving the signaling overhead to the radio subnetwork.

关键词： integrated network acoustic communication network protocols ocean engineering