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Rare Metals 2024年第6期43卷 2747-2757页

作者： Xi-Di Sun jun-Yang An Yi-Qi Sun Xin Guo jing Wu Jiang-Bo Hua Meng-Rui Su Yi Shi Li-Jia Pan Collaborative Innovation Center of Advanced Microstructures School of Electronic Science and EngineeringNanjing UniversityNanjing 210093China

Stretchable electronics that monitor joint activity and treat diseases based on liquid metal could be used in the development of healthcare *** devices can be seamlessly integrated with human ***,most high-precision microstructures and complex patterns are difficult to fabricate due to the limitations of conventional fabrication solutions,resulting in suboptimal performance under practical ***,a liquid-metal stretchable system utilizing natural leaf veins was reported as microstructures,which was based on a biomimetic concept and utilized an all-solution process for the preparation of complex *** systems are ultra-high tensile(800%tensile strain),environmentally stable(20 days)and mechanically durable(300-cycle).The system can accurately recognize the wearer's finger bending level as well as simple gesture *** the same time,the system acts as a wearable heater,which can realize the fast heating behavior of heating up to 50℃in 3 min under the human body-safe voltage(1.5 V).The tensile stability is demonstrated by the heterogeneous integration of lasers(405 nm)with the system interconnects for a stretchable and wearable light source.

关键词： Stretchable electronics Liquid metal Stretchable conductor Vein Bionicist electronics

Tough Semi-interpenetrating Polyvinylpyrrolidone/Polyacrylamide Hydrogels Enabled by Bioinspired Hydrogen-bonding Induced Phase Separation

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Chinese Journal of Polymer Science 2024年第5期42卷 591-603,I0006页

作者： Qiong-jun Xu Zhao-Yang Yuan Chang-Cheng Wang Hao Liang Yu Shi Hai-Tao Wu Hu Xu jing Zheng Jin-Rong Wu State Key Laboratory of Polymer Materials Engineering College of Polymer Science and EngineeringSichuan UniversityChengdu610065China

Semi-interpenetrating(semi-IPN)hydrogels formed by the continuous interpenetration of cross-linked polymer network and linear non-crosslinked polymer with multifunctionality are widely used in biomedical and other ***,the negative impact of linear polymer on the homogeneity of the cross-linked network often leads to a decrease in the mechanical properties of semi-IPN hydrogels and severely limits their ***,a bioinspired hydrogen-bonding induced phase separation strategy is presented to construct the tough semi-IPN polyvinylpyrrolidone/polyacrylamide hydrogels(named PVP/PAM hydrogels),including the linear polymer polyvinylpyrrolidone(PVP)and cross-linked polyacrylamide(PAM)*** resultant PVPx/PAM hydrogels exhibit unique phase separation induced by the hydrogen bonding between PVP and PAM and affected by the amount of substance of ***,the phase separation of PVPx/PAM hydrogels results in excellent mechanical properties with a strain of 2590%,tensile strength of 0.28 MPa and toughness of 2.17 MJ/m^(3).More importantly,the hydrogen bonding between PVP and PAM firstly disrupts to dissipate energy under external forces,so the PVPx/PAM hydrogels exhibit good self-recovery properties and outperform chemically cross-linked PAM hydrogels in impact resistance and damping *** is believed that the PVPx/PAM hydrogels with hydrogen-bonding induced phase separation possess more potential application prospects.

关键词： Tough Semi-interpenetrating networks Polyvinylpyrrolidone/polyacrylamide Hydrogels Phase separation

Stark splitting of intense red emission for Er^(3+)in O_(h) symmetry sites realizing optical temperature sensing in biological applications

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Rare Metals 2024年第3期43卷 1263-1274页

作者： Yue Guo Lin-jun Qin jing Xu Xiao-Ping Jiang Xiao-Yu Yue Yi Hou Hao Shi Li-Xi Wang Qi-Tu Zhang Collage of Materials Science and Engineering Nanjing Tech UniversityNanjing211816China Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites Nanjing211816China

Optical temperature sensing based on the fluorescence intensity ratio(FIR)of red emission for lanthanide ions holds significant relevance in non-contact temperature measurement for biological *** this study,the perovskite-structured KZnF_(3)is utilized as a host material for Er^(3+)to achieve a high-purity upconversion(UC)red *** observed Stark splitting of the red emission peak provides evidence of the energy level splitting of Er^(3+).Group theory is employed to decompose the spectral branching of Er^(3+)under the point group symmetry of KZnF_(3),allowing for the derivation of Stark splitting energy levels induced by the crystal field *** optical temperature-sensing behavior of the red UC luminescence was investigated,specifically examining the FIR of the splitting sub-peaks,which exhibited an exponential relationship with *** KZnF_(3):Yb^(3+),Er^(3+)demonstrated a relative sensitivity(S_(r))of 0.00182%·K^(-1)at 298 K,highlighting its excellent response to *** vivo bio-thermometry experiments conducted on chicken breast validated the material's ability to penetrate biological tissues and showed its significant sensitivity of the FIR to *** results establish KZnF_(3):Yb^(3+),Er^(3+)as a promising material for optical thermometry in various biological applications.

关键词： KZnF_(3) Er^(3+) Upconversion luminescence Stark splitting Temperature sensing

Review of the SiC LDMOS power device

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Journal of Semiconductors 2024年第8期45卷 4-17页

作者： Ziwei Hu Jiafei Yao Ang Li Qi Sun Man Li Kemeng Yang jun Zhang jing Chen Maolin Zhang Yufeng Guo College of Integrated Circuit Science and Engineering(Industry-Education Integration School) Nanjing University of Posts andT elecommunicationsNanjing 210023China National and Local Joint Engineering Laboratory of RF Integration and Micro-Assembly Technology Nanjing 210023China Nantong Institute of Nanjing University of Posts and Telecommunications Nantong 226000China

Silicon carbide(SiC),as a third-generation semiconductor material,possesses exceptional material properties that significantly enhance the performance of power *** SiC lateral double-diffused metal–oxide–semiconductor(LDMOS)power devices have undergone continuous optimization,resulting in an increase in breakdown voltage(BV)and ultra-low specific on-resistance(Ron,sp).This paper has summarized the structural optimizations and experimental progress of SiC LDMOS power devices,including the trench-gate technology,reduced surface field(RESURF)technology,doping technology,junction termination techniques and so *** paper is aimed at enhancing the understanding of the operational mechanisms and providing guidelines for the further development of SiC LDMOS power devices.

关键词： SiC LDMOS specific on-resistance breakdown voltage

Cosmology-Independent Photon Mass Limits from Localized Fast Radio Bursts by Using Artificial Neural Networks

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Chinese Physics Letters 2024年第5期41卷 177-183页

作者：冉景遇王宝魏俊杰 Purple Mountain Observatory Chinese Academy of SciencesNanjing 210023China School of Astronomy and Space Sciences University of Science and Technology of ChinaHefei 230026China

A hypothetical photon mass m_(γ) can produce a frequency-dependent vacuum dispersion of light, which leads to an additional time delay between photons with different frequencies when they propagate through a fixed distance. The dispersion measure and redshift measurements of fast radio bursts(FRBs) have been widely used to constrain the rest mass of the photon. However, all current studies analyzed the effect of the frequency-dependent dispersion for massive photons in the standard ΛCDM cosmological context. In order to alleviate the circularity problem induced by the presumption of a specific cosmological model based on the fundamental postulate of the masslessness of photons, here we employ a new model-independent smoothing technique, artificial neural network(ANN), to reconstruct the Hubble parameter H(z) function from 34 cosmic-chronometer *** combining observations of 32 well-localized FRBs and the H(z) function reconstructed by ANN, we obtain an upper limit of m_(γ) ≤ 3.5 × 10^(-51)kg, or equivalently m_(γ) ≤ 2.0 × 10^(-15)eV/c^(2)(m_(γ) ≤ 6.5 × 10^(-51)kg, or equivalently m_(γ) ≤ 3.6 × 10^(-15)eV/c_(2)) at the 1σ(2σ) confidence level. This is the first cosmology-independent photon mass limit derived from extragalactic sources.

关键词： dispersion limit Independent

Untargeted metabolomic profiling， nutritional composition and enzyme changes on Bigeye tuna(Thunnus obesus) during cold storage by HPLC-MS coupled with logistic regression

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Food Science and Human Wellness 2024年

作者： Xin-Yun Wang Zi-Xuan Zhao jun Yan jing Xie Shanghai Engineering Research Center of Aquatic Product Processing & Preservation， Shanghai Ocean University The International Peace Maternity and Child Health Hospital， School of Medicine， Shanghai Jiao Tong University National Experimental Teaching Demonstration Center for Food Science and Engineering， Shanghai Ocean University College of Food Science & Technology， Shanghai Ocean University

Bigeye tuna is a protein-rich fish that is susceptible to spoilage during cold storage， however， there is limited information on untargeted metabolomic profiling of bigeye tuna concerning spoilage-associated enzymes and metabolites. This study aimed to investigate how cold storage affects enzyme activities， nutrient composition， tissue microstructures and spoilage metabolites of bigeye tuna. The activities of cathepsin B， H， L increased， while Na+/K+-ATPase and Mg2＋-ATPase decreased， α-glucosidase （AG） and β-1，4-N-acetylglucosaminidase （NAG）， lipase and lipoxygenase first increased and then decreased during cold storage， suggesting that proteins undergo degradation and ATP metabolism occurs at a faster rate during cold storage. Nutrient composition （moisture， protein， and lipid content）， free amino acids， total amino acids decreased， suggesting that the nutritional value of bigeye tuna was reduced. Besides， a logistic regression equation has been established as a food analysis tool and assess the dynamics and correlation of the enzyme of bigeye tuna during cold storage. Based on untargeted metabolomic profiling analysis， a total of 484 metabolites were identified as significantly differential metabolites in the bigeye tuna contained several spoilage metabolites involved in lipid metabolism （1-Acyl-sn-glycero-3phosphocholine， Glycerophosphocholine， Choline phosphate）， amino acid metabolism (L-Histidine， 5-Deoxy-5'-（methylthio）adenosine， 5-Methylthioadenosine)， carbohydrate metabolism （D-Gluconicacid， beta-D-Fructose 1，6-bisphosphate， D-Glyceraldehyde 3-phosphate）. The results of tissue microstructures of tuna showed a looser network and visible deterioration of tissue fiber during cold storage. Therefore， metabolomic analysis and tissue microstructures provide insight into the spoilage mechanism investigations on bigeye tuna during cold storage.

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Biochar regulates biogeochemical cycling of iron and chromium in a soil-rice system by stimulating Geobacter and Clostridium

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Pedosphere 2024年第5期34卷 929-940页

作者： Min XU Yang LIN jing MA Lulu LONG Chao CHEN Gang YANG Chun SONG jun WU Xiaohong ZHANG Peng GAO College of Environmental Science Sichuan Agricultural University Soil Water and Ecosystem Sciences Department University of Florida College of Water Conservancy and Hydropower Engineering Sichuan Agricultural University Department of Environmental and Occupational Health University of Pittsburgh School of Public Health

In soil-rice systems,microbial reduction of iron （Fe） has been recognized as a crucial biogeochemical process that regulates Fe and chromium （Cr）translocation;however,the underlying processes are *** investigate the impacts of biochar on the biochemical cycling of Fe and Cr and their toxicity to rice,maize straw biochar was applied at 1%（weight/weight） to a paddy soil spiked with 300 mg kg-1Cr under two phosphorus （P） levels (0 or 90 mg kg-1) in a pot *** key microbial groups affecting Fe dissimilatory reduction and their environmental drivers were *** inhibited root Cr uptake by 36%,owing to the promoted iron plaque （IP） formation on the rice root *** analysis showed that Fe concentration in pore water was strongly linked to the abundances of Geobacter （r=0.81–0.94,P<0.05） and Clostridium （r=0.83–0.95,P<0.05）,indicating that Geobacter and Clostridium played essential roles in Fe *** analysis showed that labile carbon and pore water P concentrations were the key determinants influencing Fe-reducing bacterial abundances,accounting for 42%and 32%of the variation in community composition,***,biochar increased Fe and P concentrations in root cell walls,which retained more ***,Cr stress in rice under biochar treatment was relieved through increasing IP formation and altering subcellular *** mechanistic insights had important implications for reducing Cr uptake by rice.

关键词： chromium translocation iron plaque iron reduction maize straw biochar microbial reduction paddy soil phosphorus fertilization subcellular distribution

Cultivating the uncultured:Harnessing the“sandwich agar plate”approach to isolate heme-dependent bacteria from marine sediment

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mLife 2024年第1期3卷 143-155页

作者： jing Zhang Qi-Yun Liang Da-Shuai Mu Fengbai Lian Ya Gong Mengqi Ye Guan-jun Chen Yuqi Ye Zong-jun Du State Key Laboratory of Microbial Techlogy Insttute of Micrbial TchnoogyShandong UniversityQingdaoChina Marine College Shandong UniverstyWeihaiChina Shandong University-Weihai Research Institute of Industrial Technology WeihaiChina

In the classical microbial isolation technique,the isolation process inevitably destroys all microbial interactions and thus makes it difficult to culture the many microorganisms that rely on these interactions for *** this study,we designed a simple coculture technique named the“sandwich agar plate method,”which maintains microbial interactions throughout the isolation and pure culture *** total yield of uncultured species in sandwich agar plates based on eight helper strains was almost 10-fold that of the control *** uncultured species displayed commensal *** study found that heme was the growth-promoting factor of some marine commensal *** genomic analysis revealed that heme auxotrophies were common in various biotopes and prevalent in many uncultured microbial ***,our study supported that the survival strategies of heme auxotrophy in different habitats varied *** findings highlight that cocultivation based on the“sandwich agar plate method”could be developed and used to isolate more uncultured bacteria.

关键词： cultivation growth factors heme sandwich agar plate uncultured bacteria

Overlooked interaction between redox-mediator and bisphenol-A in permanganate oxidation

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Environmental Science and Ecotechnology 2024年第5期21卷 248-255页

作者： Honglong Zhang Qiaoqiao Zhao Kangbao Zhong Ruopeng Bai Jiaojiao Dong jun Ma jing Zhang Timothy J.Strathmann School of Environment Harbin Institute of TechnologyHarbin150090PR China Institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing100084PR China School of Chemistry and Chemical Engineering Chongqing Key Laboratory of Chemical Theory and MechanismChongqing UniversityChongqing401331PR China College of Environment and Ecology Chongqing UniversityChongqing400045PR China Department of Civil and Environmental Engineering Colorado School of Mines1500 Illinois StreetGoldenCO80401United States

Research efforts on permanganate(Mn(VII))combined with redox-mediator(RM),have received increasing attention due to their significant performance for bisphenol-A(BPA)***,the mechanisms underpinning BPA degradation remain *** we show the overlooked interactions between RM and BPA during permanganate oxidation by introducing an RMdN-hydroxyphthalimide(NHPI).We discovered that the concurrent generation of MnO_(2) and phthalimide-N-oxyl(PINO)radical significantly enhances BPA oxidation within the pH range of *** detection of radical cross-coupling products between PINO radicals and BPA or its derivatives corroborates the pivotal role of radical cross-coupling in BPA ***,we observed the formation of an NHPI-BPA complex,which undergoes preferential oxidation by Mn(VII),marked by the emergence of an electronrich domain in *** findings unveil the underlying mechanisms in the Mn(VII)/RM system and bridge the knowledge gap concerning BPA transformation via *** research paves the way for further exploration into optimizing complexation sites and RM dosage,significantly enhancing the system's efficiency in water treatment applications.

关键词： Permanganate Redox-mediator Bisphenol-A Radical cross-coupling Complexation

Notably Accelerated Nano-Bainite Transformation via Increasing Undissolved Carbides Content on GCr15Si1Mo Bearing Steel

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Acta Metallurgica Sinica(English Letters) 2024年第4期37卷 703-712页

作者： Yan-Hui Wang Hua-Qiang Sun Wen-jing Feng Lei-Jie Zhao Xiang Chen Qing-An Chen Hai-Tao Sun Jian-jun Wang Zhi-Nan Yang Key Laboratory of Intelligent Industrial Equipment Technology of Hebei Province School of Mechanical and Equipment EngineeringHebei University of EngineeringHandan056038China Collaborative Innovation Center for Modern Equipment Manufacturing of Jinan New Area Hebei University of EngineeringHandan056038China School of Materials Science and Engineering Tsinghua UniversityBeijing100084China Avic Shang da Superalloys Company Limited Xingtai054800China National Engineering Research Center for Equipment and Technology of Cold Strip Rolling Yanshan UniversityQinhuangdao066004China

In this study, a high-carbon nano-bainitic GCr15Si1Mo bearing steel was investigated. Specifically, the effects of content and size of undissolved carbides on the microstructure and transformation kinetics of nano-bainite were analyzed. The results demonstrated that after prolonged austempering at low temperatures, the mixed microstructure composed of nano-bainite (NB), undissolved carbides (UC), and retained austenite (RA) was obtained in GCr15SiMo steel. When the experimental steel was austenitized at 900 ℃, the undissolved carbides gradually dissolved until reaching a stable state with increasing holding time. Furthermore, at the same austempering temperature, despite different volume fractions of undissolved carbides in the substrate, the volume fractions of nano-bainite in the final microstructures remained essentially the same. Moreover, the higher the content of undissolved carbides in steel, the faster the transformation rate of nano-bainite and the shorter the total transformation time.

关键词： Nano-bainite Undissolved carbides Bainitic transformation kinetics Carbon concentration