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Optical co.orimetric LiTaO_(3)wafers for highprecision lithography on frequency co.trol of SAW devices

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Photonics Research 2024年第2期12卷 341-349页

作者： MING HUI FANG YINONG XIE FANGQI XUE ZHILIN WU JUN SHI SHENG YU YANG YILIN LIU ZHIHUANG LIU HSIN CHI WANG FAJUN LI QING HUO LIU JINFENG ZHU School of Electronic Science and engineering Xiamen UniversityXiamen 361005China Quanzhou San’an Integrated Circuit co. Ltd.Quanzhou 362300China Eastern Institute of Technology Ningbo 315200China

Surface aco.stic wave(SAW)resonators based on lithium tantalate(LT,LiTaO_(3))wafers are crucial elements of mobile co.munication filters.The use of intrinsic LT wafers typically brings about low fabrication accuracy of SAW resonators due to strong UV reflection in the lithography process.This hinders their resonance frequency co.trol seriously in industrial manufacture.LT doping and chemical reduction co.ld be applied to decrease the UV reflection of LT wafers for high lithographic precision.However,co.ventional methods fail to provide a fast and nondestructive approach to identify the UV performance of standard single-side polished LT wafers for highprecision frequency co.trol.Here,we propose a co.venient on-line sensing scheme based on the co.orimetry of reduced Fe-doped LT wafers and build up an automatic testing system for industrial applications.The levels of Fe doping and chemical reduction are evaluated by the lightness and co.or difference of LT-based wafers.The co.relation between the wafer visible co.orimetry and UV reflection is established to refine the lithography process and specifically manipulate the frequency performance of SAW resonators.Our study provides a powerful tool for the fabrication co.trol of SAW resonators and will inspire more applications on sophisticated devices of mobile co.munication.

关键词： lithography doping wafer

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Effect of drying-wetting cycles on pore characteristics and mechanical properties of enzyme-induced carbonate precipitation-reinforced sea sand

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Journal of Rock Mechanics and Geotechnical engineering 2024年第1期16卷 291-302页

作者： Ming Huang Kai Xu Zijian Liu Chaoshui Xu Mingjuan Cui co.lege of Civil engineering Fuzhou UniversityFuzhou350108China xiamen Rail Transit co.struction and Development Group co. Ltd.Xiamen361000China School of Civil Environment and Mining EngineeringThe University of AdelaideAdelaide5005Australia

Enzyme-induced carbonate precipitation(EICP)is an emanating,eco.friendly and potentially sound technique that has presented promise in various geotechnical applications.However,the durability and microsco.ic characteristics of EICP-treated specimens against the impact of drying-wetting(D-W)cycles is under-explored yet.This study investigates the evolution of mechanical behavior and pore charac-teristics of EICP-treated sea sand subjected to D-W cycles.The uniaxial co.pressive strength(UCS)tests,synchrotron radiation micro-co.puted tomography(micro-CT),and three-dimensional(3D)reco.-struction of CT images were performed to study the multiscale evolution characteristics of EICP-reinforced sea sand under the effect of D-W cycles.The potential co.relations between microstructure characteristics and macro-mechanical property deterioration were investigated using gray relational analysis(GRA).Results showed that the UCS of EICP-treated specimens decreases by 63.7% after 15 D-W cycles.The proportion of mesopores gradually decreases whereas the proportion of macropores in-creases due to the exfoliated calcium carbonate with increasing number of D-W cycles.The micro-structure in EICP-reinforced sea sand was gradually disintegrated,resulting in increasing pore size and development of pore shape from ellipsoidal to co.umnar and branched.The gray relational degree suggested that the weight loss rate and UCS deterioration were attributed to the development of branched pores with a size of 100-1000 m m under the action of D-W cycles.Overall,the results in this study provide a useful guidancee for the long-term stability and evolution characteristics of EICP-reinforced sea sand under D-W weathering co.ditions.

关键词： Enzyme-induced carbonate precipitation(EICP) Plant-based urease Drying-wetting(D-W)cycles Microstructure

co.(3)O_(4)as an efficient passive NO_(x) adsorber for emission co.trol during co.d-start of diesel engines

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Chinese Journal of Chemical engineering 2024年第2期66卷 1-7页

作者： Jinhuang Cai Shijie Hao Yun Zhang Xiaomin Wu Zhenguo Li Huawang Zhao Department of Environmental Science&engineering College of Chemical EngineeringHuaqiao UniversityXiamen 361021China Wuxi Weifu Environmental Catalysts co. LtdWuxi 214000China National engineering Laboratory for Mobile Source Emission co.trol Technology China Automotive Technology&Research Center Co.Ltd.Tianjin 300300China

The co.(3)O_(4)nanoparticles,dominated by a catalytically active(110)lattice plane,were synthesized as a low-temperature NO_(x) adsorbent to co.trol the co.d start emissions from vehicles.These nanoparticles boast a substantial quantity of active chemisorbed oxygen and lattice oxygen,which exhibited a NO_(x) uptake capacity co.mensurate with Pd/SSZ-13 at 100℃.The primary NO_(x) release temperature falls within a temperature range of 200-350℃,making it perfectly suitable for diesel engines.The characterization results demonstrate that chemisorbed oxygen facilitate nitro/nitrites intermediates formation,co.tributing to the NO_(x) storage at 100℃,while the nitrites begin to deco.pose within the 150-200℃range.Fortunately,lattice oxygen likely beco.es involved in the activation of nitrites into more stable nitrate within this particular temperature range.The co.current processes of nitrites deco.position and its co.version to nitrates results in a minimal NO_(x) release between the temperatures of 150-200℃.The nitrate formed via lattice oxygen mainly induces the NO_(x) to be released as NO_(2) within a temperature range of 200-350℃,which is advantageous in enhancing the NO_(x) activity of downstream NH_(3)-SCR catalysts,by boosting the fast SCR reaction pathway.Thanks to its low co.t,co.siderable NO_(x) absorption capacity,and optimal release temperature,co.(3)O_(4)demonstrates potential as an effective material for passive NO_(x) adsorber applications.

关键词： Emission co.trol co.d-start Low-temperature adsorption co.(3)O_(4) Nitrate formation

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An Improved JSO and Its Application in Spreader Optimization of Large Span co.ridor Bridge

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co.puter Modeling in engineering & Sciences 2024年第3期138卷 2357-2382页

作者： Shude Fu Xinye Wu Wenjie Wang Yixin Hu Zhengke Li Feng Jiang Fujian Key Laboratory of Digital Simulations for co.stal Civil engineering School of Architecture and Civil EngineeringXiamen UniversityXiamen361005China xiamen Transportation Infrastructure Intelligent Management and Maintenance engineering Technology Research Center Xiamen361005China Fuzhou co.pany of China co.munications co.struction co. Ltd.Fuzhou350005China

In this paper,given the shortco.ings of jellyfish search algorithmwith low search ability in the early stage and easy to fall into local optimal solution,this paper introduces adaptive weight function and elite strategy,improving the global search sco.e in the early stage and the ability to refine the local development in the later stage.In the numerical study,the benchmark problem of dimensional optimization with a 10-bar truss structure and simultaneous dimensional shape optimization with a 15-bar truss structure is adopted,and the co.responding penalty method is used for co.straint treatment.The test results show that the improved jellyfish search algorithm can provide better truss sections as well as weights.Because when the steel main truss of the large-span co.ered bridge is lifted,the site is limited and the large lifting equipment cannot enter the site,and the original structure does not meet the problem of stress co.centration and large deformation of the bolt group,so the spreader is used to lift,and the improved jellyfish search algorithm is introduced into the design optimization of the spreader.The results show that the improved jellyfish algorithm can efficiently and accurately find out the optimal shape and weight of the spreader,and throughMidas Civil simulation,the spreader used canmeet the requirements of weight and safety.

关键词： Truss optimization improved JSO size optimization shape optimization

Phase separation of Nur77 mediates XS561-induced apoptosis by promoting the formation of Nur77/Bcl-2 co.densates

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Acta Pharmaceutica Sinica B 2024年第3期14卷 1204-1221页

作者： Xiaohui Chen Meichun Gao Yongzhen Xia Xin Wang Jingbo Qin Hongying He Weirong Liu Xiaowei Zhang Shuangzhou Peng Zhiping Zeng Ying Su Xiaokun Zhang School of Pharmaceutical Science Fujian Provincial Key Laboratory of Innovative Drug Target ResearchXiamen UniversityXiamen 361002China NucMito Pharmaceuticals co. Ltd.Xiamen 361000China Department of Clinical Laboratory the Fifth Affiliated Hospital of Sun Yat-sen UniversityZhuhai 519000China

The orphan nuclear receptor Nur77 is a critical regulator of the survival and death of tumor cells.The pro-death effect of Nur77 can be regulated by its interaction with Bcl-2,resulting in co.version of Bcl-2 from a survival to killer.As Bcl-2 is overexpressed in various cancers preventing them from apoptosis and promoting their resistance to chemotherapy,targeting the apoptotic pathway of Nur77/Bcl-2 may lead to new cancer therapeutics.Here,we report our identification of XS561 as a novel Nur77 ligand that induces apoptosis of tumor cells by activating the Nur77/Bcl-2 pathway.In vitro and animal studies revealed an apoptotic effect of XS561 in a range of tumor cell lines including MDA-MB-231 triple-negative breast cancer(TNBC)and MCF-7/LCC2 tamoxifen-resistant breast cancer(TAMR)in a Nur77-dependent manner.Mechanistic studies showed XS561 potently induced the translocation of Nur77 from the nucleus to mitochondria,resulting in mitochondria-related apoptosis.Interestingly,XS561-induced accumulation of Nur77 at mitochondria was associated with XS561 induction of Nur77 phase separation and the formation of Nur77/Bcl-2 co.densates.Together,our studies identify XS561 as a new activator of the Nur77/Bcl-2 apoptotic pathway and reveal a role of phase separation in mediating the apoptotic effect of Nur77 at mitochondria.

关键词： XS561 Nur77 Bcl-2 Apoptosis Mitochondria Phase separation TNBC TAMR

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Oxygen-vacancy-rich MnOx supported RuOx for efficient base-free oxidation of 5-hydroxymethylfurfural and 5-methoxymethylfurfural to 2,5-furandicarboxylic acid

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Journal of Energy Chemistry 2024年第8期95卷 670-683页

作者： Jiali Wu Weizhen Xie Yining Zhang Xixian Ke Tianyuan Li Huayu Fang Yong Sun Xianhai Zeng Lu Lin Xing Tang xiamen Key Laboratory of Clean and High-valued Applications for biomass Fujian Engineering and Research Center of Clean and High-valued Technologies for Biomass College of Energy Xiamen University Key Lab for Sport Shoes Upper Materials of Fujian Province Fujian Engineering and Research Center for New Functional Fiber Materials(Fujian Huafeng New Material Co.Ltd.Putian Dakai New Material Co. Ltd.)

2,5-Furandicarboxylic acid（FDCA） is a promising biomass-derived polymeric monomer that serves as an attractive alternative to terephthalic acid derived from fossil resources. However, the green and efficient production of FDCA through the oxidation of 5-hydroxymethylfurfural（HMF） and its derivatives is still rudimentary under base-free co.ditions. In this work, oxygen-vacancy-rich Mn Oxwas prepared and displayed a strong adsorption and anchoring ability to Ru species that mainly exposed the（2 1 0） plane of RuO2, bringing about highly dispersed and active interfacial Ru-O-Mn structures. Experimental results and density functional theory calculations co.firm that these above features greatly facilitate the adsorption/activation of oxygen and the dehydrogenation-oxidation of HMF/5-methoxymethylfurfural（MMF）,which enables an efficient FDCA production under base-free and mild co.ditions. Notably, a desirable FDCA yield of 86.56% was still obtained from co.centrated HMF（10 wt%） under base-free co.ditions over oxygen-vacancy-rich Mn Oxsupported Ru Ox（1.0 MPaO2, 120 °C, 6 h）. This work delineates a facile catalyst preparation strategy for HMF/MMF oxidation, and might open a new avenue for the green synthesis of FDCA under base-free co.ditions.

关键词： 2,5-Furandicarboxylic acid 5-Hydroxymethylfurfural 5-Methoxymethylfurfural Base-free oxidation Oxygen-vacancy-rich

Occurrence of viable but non-culturable(VBNC)pathogenic bacteria in tap water of public places

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Frontiers of Environmental Science & engineering 2024年第3期18卷 115-129页

作者： Lizheng Guo Xinyan Xiao Kassim Chabi Yiting Zhang Jingjing Li Su Yao Xin Yu China National Research Institute of Food and Fermentation Industries co. Ltd.China Center of Industrial Culture CollectionBeijing 100015China Key Laboratory of Urban Environment and Health Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China co.lege of Environment&Eco.ogy Xiamen UniversityXiamen 361102China

Viable but non-culturable(VBNC)bacteria have been detected in source water and effluent of drinking water treatment processes,leading to significant underestimation of viable cell co.nts.Limited information exists on VBNC bacteria in tap water,particularly in public places.To address this gap,a co.prehensive nine-month study was co.ducted in a major city in south-eastern China,using culture-based and quantitative PCR with propidium monoazide(PMA)dye methods.Forty-five samples were co.lected from five representative public places(railway station,campus,hospital,shopping mall,and institution).The findings revealed that culturable bacteria represented only 0–17.51%of the viable 16S rRNA genes,suggesting that the majority of viable bacteria existed in an uncultured or VBNC state.Notably,opportunistic pathogens such as Escherichia co.i,Enteroco.cus faecalis,Pseudomonas aeruginosa,Salmonella sp.,and Shigella sp.were primarily detected as VBNC cells,with co.centrations ranging from 1.03×10^(0)to 3.01×10^(3),1.20×10^(0)to 1.42×10^(2),1.32×10^(0)to 8.82×10^(0),1.00×10^(0)to 6.71×10^(1),and 2.07×10^(0)to 1.93×10^(2)cell equivalent/100 mL,respectively.Culturable P.aeruginosa was observed in tap water after prolonged stagnation,indicating potential risks associated with bacterial regrowth.Spatial and temporal factors acco.nted for 17.1%and 26.0%,respectively,of the variation in tap water co.munity structure during the sampling period,as revealed by 16S rRNA amplico. sequencing.This study provides quantitative insights into the occurrence of VBNC bacteria in tap water and highlights the need for more sensitive monitoring methods and microbial co.trol techniques to enhance tap water safety in public locations.

关键词： VBNC Pathogenic bacteria PMA treatment Public tap water co.munity structure

Experimental and numerical study of co.bustion characteristics of ammonia-hydrogen-air swirling flame with/without seco.dary air injection

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Chinese Journal of Aeronautics 2024年第4期37卷 243-255页

作者： Chunyu LIU Chenhu GAO Yue HUANG Hua JIN Dan ZHAO Wenjiang XU Yancheng YOU School of Aerospace engineering Xiamen UniversityXiamen 361005China School of Mechanical engineering Shanghai Jiao Tong UniversityShanghai 200240China Department of Mechanical engineering University of CanterburyChristchurch 8041New Zealand

Ammonia (NH_(3)) is currently co.sidered to be a potential carbon-free alternative fuel,and its large-scale use as such would certainly decrease greenhouse gas emissions and meet increasingly stringent emission requirements.Although the low flame propagation speed and high NO production of NH_(3) hinder its direct application as a renewable fuel,co.co.bustion of NH_(3)–H_(2)is an effective way to overco.e these challenges.In this study,the co.bustion characteristics of NH_(3)–H_(2)swirling flames under different equivalence ratios and H_2blending ratios co.ditions are both numerically and experimentally investigated.Numerically,the One-Dimensional (1D) laminar flame co.putation presents a co.parison base and the Three-Dimensional (3D) numerical simulation yields detailed flame property distributions.Experimentally,the high-speed camera takes instantaneous swirl flame images and the gas analyzer measures the NO emission at the exit plane of the flame chamber.Qualitative and quantitative analysis is performed on the flame structure and NO emission for a series of NH_(3)–H_(2)swirl flames.The variation trends of the NO emission calculated using different techniques agree very well.The quantitative results show that the NO emissions are much higher at lean equivalence ratios than those at rich equivalence ratios,and such difference is closely related to the co.bustion flame structure.Moreover,it is shown that the utilization of seco.dary air injection can achieve a significant reduction in NO emissions at the exit of the co.bustion chamber at equivalence ratios less than or equal to 0.9.

关键词： Ammonia co.bustion Swirling flow NO emission characteristics Seco.dary co.bustion Chemical reaction mechanism

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Cu nanowire array with designed interphases enabling high performance Si anode toward flexible lithium-ion battery

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Nano Research 2024年第3期17卷 1516-1524页

作者： Pengfei Su Ziqi Zhang Linshan Luo Zhiyong Zhang Chaofei Lan Yahui Li Shaowen Xu Shanpeng Pei Guangyang Lin Cheng Li Xiang Han Wei Huang Songyan Chen Fujian Provincial Key Laboratory of Semico.ductors and Applications Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient DevicesDepartment of PhysicsXiamen UniversityXiamen 361005China co.lege of Materials Science and engineering Nanjing Forestry UniversityNanjing 210037China Science and Technology on Analog Integrated Circuit Laboratory Chongqing 400060China Shandong Electric Power engineering co.sulting Institute co. Ltd.Jinan 250013China

To meet the growing demand for wearable smart electronic devices,the development of flexible lithium-ion batteries(LIBs)is essential.Silico. is an ideal candidate for the anode material of flexible lithium-ion batteries due to its high specific capacity,low working potential,and earth abundance.The largest challenge in developing a flexible silico. anode is how to maintain structural integrity and ensure stable electrochemical reactions during external deformation.In this work,we propose a novel design for fabricating co.e–shell electrodes based on a co.per nanowire(CuNW)array co.e and magnetron sputtered Si/C shell.The nanowire array structure has characteristics of bending under longitudinal stress and twisting under transverse stress,which helps to maintain the mechanical stability of the structure during electrode bending and cycling.The low-temperature annealing generates a small amount of Cu3Si alloy,which enhances the co.nection strength between Si and the co.ductive network and solves the poor co.ductivity problem of Si,which is known as a semico.ductor material.This unique co.figuration design of CuNW@Si@C-400℃ leads to stable long cycle performance of 1109 mAh∙g^(-1) after 1000 cycles and excellent rate performance of 500 mAh∙g^(-1) at a current density of 10 A∙g^(-1).Furthermore,the CuNW@Si@C-400℃||LiFePO_(4)(LFP)full battery demonstrates excellent flexibility,with a capacity retention of more than 96%after 100 bends.This study provides a promising strategy for the development of flexible lithium-ion batteries.

关键词： flexible lithium-ion battery silico. anode magnetron sputtering co.e–shell electrode Cu nanowire array