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Bio-Based Waterborne Poly(Vanillin-Butyl Acrylate)/MXene Coatings f.r Leather with Desired Warmth Retention and Antibacterial Properties

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Engineering 2024年第5期36卷 250-263页

作者： Jianzhong ma Li ma Lei Zhang Wenbo Zhang Qianqian f.n Buxing Han College of.Bioresources Chemical and materials Engineering Shaanxi University of Science and TechnologyXi’an 710021China Xi’an Key Laboratory of.Green Chemicals and f.nctional materials Xi’an 710021China College of.Chemistry and Chemical Engineering Shaanxi University of Science and TechnologyXi’an 710021China Shaanxi Collaborative Innovation Center of.Industrial Auxiliary Chemistry and Technology Shaanxi University of Science and TechnologyXi’an 710021China Institute of.Chemistry Chinese Academy of SciencesBeijing 100190China

This study presents a solvent-f.ee,f.cile synthesis of.a bio-based green antibacterial agent and aromatic monomer methacrylated vanillin(MV)using *** resulting MV not only imparted antibacterial properties to coatings layered on leather,but could also be employed as a green alternative to petroleum-based carcinogen styrene(St).Herein,MV was copolymerized with butyl acrylate(BA)to obtain waterborne bio-based P(MV-BA)miniemulsion via miniemulsion ***,MXene nanosheets with excellent photothermal conversion perf.rmance and antibacterial properties,were introduced into the P(MV-BA)miniemulsion by ultrasonic *** the gradual solidif.cation of.P(MV-BA)/MXene nanocomposite miniemulsion on the leather surf.ce,MXene gradually migrated to the surf.ce of.leather coatings due to the cavitation ef.ect of.ultrasonication and amphiphilicity of.MXene,which prompted its f.ll exposure to light and bacteria,exerting the maximum photothermal conversion ef.iciency and signif.cant antibacterial *** particular,when the dosage of.MXene nanosheets was 1.4 wt%,the surf.ce temperature of.P(MV-BA)/MXene nanocomposite miniemulsioncoated leather(PML)increased by about 15℃ in an outdoor environment during winter,and the antibacterial rate against Escherichia coli and Staphylococcus aureus was nearly 100%under the simulated sunlight treatment f.r 30 ***,the introduction of.MXene nanosheets increased the air permeability,water vapor permeability,and thermal stability of.these *** study provides a new insight into the preparation of.novel,green,and waterborne bio-based nanocomposite coatings f.r leather,with desired warmth retention and antibacterial *** can not only realize zerocarbon heating based on sunlight in winter,reducing the use of.f.ssil f.els and greenhouse gas emissions,but also improve ability to f.ght of. invasion by harmf.l bacteria,viruses,and other microorganisms.

关键词： MXene nanosheets Vanillin Styrene substitute Leather coating Photothermal conversion Warmth retention Antibacterial properties

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Supported Recyclable Metal-f.ee f.ustrated Lewis Pair Catalyst f.r Catalytic Hydrogenation of.Substituted Pyridines to Piperidines

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Chemical Research in Chinese Universities 2024年第4期40卷 682-689页

作者： ma Shaohua TANG Zhiyong CAS Key Laboratory f.r Nanosystem and Hierarchical f.brication CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing100190P.R.China University of.Chinese Academy of.Sciences Beijing100049P.R.China

The construction of.heterogeneous f.ustrated Lewis pairs(f.Ps)catalysts is crucial f.r realizing highly ef.icient and recyclable pyridines catalytic *** this work,we prepared a recyclable heterogenous f.Ps catalyst CMP-Bf.with conjugated microporous polymer CMP-ethynyl as the support via self.catalyzed 1,1-carboboration reaction with commercial Lewis acid B(C_(6)f.(5))_(3).The as-synthesized CMP-Bf.demonstrates superior heterogenous catalytic hydrogenation perf.rmance(conversion>99%),and considerable stability(84%conversion af.er three cycles)in recyclable hydrogenation of.2,*** work provides insights into the f.brication and catalytic application of.recyclable heterogenous f.P catalysts.

关键词： Pyridine hydrogenation f.ustrated Lewis pair Conjugated microporous polymer

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A new gravitational theory and dark matter problem

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Communications in Theoretical Physics 2024年第6期76卷 129-136页

作者： Xiong Zhao Yongge ma Department of.Physics Beijing Normal UniversityBeijing 100875China

We propose a new gravitational theory with torsion based on Riemann-Cartan geometry,in which all physical quantities are *** addition to the spacetime metric,the gravitational degrees of.f.eedom in this theory also include the torsion and two scalar *** energy-momentum tensor of.the matter f.elds in this theory is also proposed.A spherically symmetric static vacuum solution of.the theory is *** turns out that this solution can f.t the observational data of.the rotation curve outside the stellar disk in the Milky ***,the galactic dark matter may just be the gravitational ef.ect of.the theory with torsion.

关键词： gravity torsion dark matter

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In silico optimization of.actuation perf.rmance in dielectric elastomercomposites via integrated f.nite element modeling and deep learning

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Theoretical & Applied Mechanics Letters 2024年第1期14卷 48-56页

作者： Jiaxuan ma Sheng Sun materials Genome Institute Shanghai UniversityShanghai 200444China Zhejiang Laboratory Hangzhou 311100China Shanghai f.ontier Science Center of.Mechanoinf.rmatics Shanghai UniversityShanghai 200444China

Dielectric elastomers(DEs)require balanced electric actuation perf.rmance and mechanical integrity under applied *** high dielectric particles as f.llers provides extensive design space to optimize concentration,morphology,and distribution f.r improved actuation perf.rmance and material *** study presents an integrated f.amework combining f.nite element modeling(f.M)and deep learning to optimize the microstructure of.DE *** f.rst calculates actuation perf.rmance and the ef.ective modulus across varied f.ller combinations,with these data used to train a convolutional neural network(CNN).Integrating the CNN into a multi-objective genetic algorithm generates designs with enhanced actuation perf.rmance and material modulus compared to the conventional optimization approach based on f.M approach within the same *** f.amework harnesses artif.cial intelligence to navigate vast design possibilities,enabling optimized microstructures f.r high-perf.rmance DE composites.

关键词： Dielectric elastomer composites Multi-objective optimization f.nite element modeling Convolutional neural network

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Exploring the f.nctional roles of.small-molecule metabolites in disease research:Recent advancements in metabolomics

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Chinese Chemical Letters 2024年第8期35卷 93-100页

作者： Aolei Tan Xiaoxiao ma Department of.Precision Instrument Tsinghua UniversityBeijing 100084China

Metabolism encompasses a series of.intricate biochemical processes that are vital f.r the sustenance of.lif. in ***,an essential scientif.c discipline,is a f.eld of.study within the broader domain of.systems biology that f.cuses on the comprehensive analysis of.small molecules,known as metabolites including lipids,coenzymes,etc.,which are synthesized during *** the contin-uous development of.metabolomics,the multiple biological f.nctions of.metabolites are constantly being discovered,encompassing signal transduction and enzyme stimulation,while concurrently exhibiting as-sociations with af.lictions like cancer and *** comprehension of.metabolite f.nctionalities and their intricate interplay with disease conditions assumes paramount importance in both disease-f.cused research endeavors and the development of.diagnostic *** scholarly exposition undertakes an ex-tensive review of.recent advancements in the investigation of.f.nctional roles assumed by metabolites,with specif.c emphasis on metabolites in lipid synthesis,glucose metabolism and exogenous metabolites.

关键词： Metabolites Small molecules Biological f.nctions Physiological processes Diseases

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Nuclear phylogenomics of.angiosperms and insights into their relationships and evolution

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Journal of.Integrative Plant Biology 2024年第3期66卷 546-578页

作者： Guojin Zhang Hong ma College of.Lif. Sciences Hunan Normal UniversityChangsha 410081China Department of.Biology 510 Mueller LaboratoryHuck Institutes of the Life SciencesThe Pennsylvania State UniversityUniversity ParkPA 16802USA

Angiosperms(f.owering plants) are by f.r the most diverse land plant group with over 300,000 species. The sudden appearance of.diverse angiosperms in the f.ssil record was ref.rred to by Darwin as the “abominable mystery,”hence contributing to the heightened interest in angiosperm evolution. Angiosperms display wide ranges of.morphological, physiological,and ecological characters, some of.which have probably inf.uenced their species richness. The evolutionary analyses of.these characteristics help to address questions of.angiosperm diversif.cation and require well resolved phylogeny. f.llowing the great successes of.phylogenetic analyses using plastid sequences,dozens to thousands of.nuclear genes f.om next-generation sequencing have been used in angiosperm phylogenomic analyses, providing well resolved phylogenies and new insights into the evolution of.angiosperms. In this review we f.cus on recent nuclear phylogenomic analyses of.large angiosperm clades, orders, f.milies,and subdivisions of.some f.milies and provide a summarized Nuclear Phylogenetic Tree of.Angiosperm f.milies. The newly established nuclear phylogenetic relationships are highlighted and compared with previous phylogenetic results. The sequenced genomes of.Amborella,Nymphaea, Chloranthus, Ceratophyllum, and species of.monocots, magnoliids, and basal eudicots, have f.cilitated the phylogenomics of.relationships among f.ve major angiosperms clades. All but one of.the 64 angiosperm orders were included in nuclear phylogenomics with well resolved relationships except the placements of.several orders. Most f.milies have been included with robust and highly supported placements, especially f.r relationships within several large and important orders and ***, we examine the divergence time estimation and biogeographic analyses of.angiosperm on the basis of.the nuclear phylogenomic f.ameworks and discuss the dif.erences compared with previous analyses. f.rthermore,we discuss the implicatio

关键词： angiosperms evolution f.owering plants nuclear gene phylogenomics phylogeny

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Catalysis by subsurf.ce metal atoms in Al(001) through electron transf.r

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National Science Review 2024年第4期11卷 12-13页

作者： Bo Sun Ding ma Beijing National Laboratory f.r molecular Science New Cornerstone Science Laboratory College of Chemistry and Molecular Engineering Peking University

Heterogeneous catalysis plays a crucial role in the chemical industry, which has evolved f.om the investigation of.chemisorption to an electronic structure[1]. Diverse strategies, such as alloying,doping, and conf.ning, have been applied to enhance the catalytic properties of.active sites through electronic modulation. The electron transf.r between active sites and substrates prof.undly inf.uences catalytic activity [2].

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Clinical applications of.metagenomics next-generation sequencing in inf.ctious diseases

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Journal of.Zhejiang University-Science B(Biomedicine & Biotechnology) 2024年第6期25卷 471-484页

作者： Ying LIU Yongjun ma Department of.Clinical Laboratory Affiliated Jinhua HospitalZhejiang University School of MedicineJinhua 321000China

Inf.ctious diseases are a great threat to human *** and accurate detection of.pathogens is important in the diagnosis and treatment of.inf.ctious *** next-generation sequencing(mNGS)is an unbiased and comprehensive approach f.r detecting all RNA and DNA in a *** the development of.sequencing and bioinf.rmatics technologies,mNGS is moving f.om research to clinical application,which opens a new avenue f.r pathogen *** studies have revealed good potential f.r the clinical application of.mNGS in inf.ctious diseases,especially in dif.icult-to-detect,rare,and novel ***,there are several hurdles in the clinical application of.mNGS,such as:(1)lack of.universal workf.ow validation and quality assurance;(2)insensitivity to high-host background and low-biomass samples;and(3)lack of.standardized instructions f.r mass data analysis and report ***,a complete understanding of.this new technology will help promote the clinical application of.mNGS to inf.ctious *** review brief.y introduces the history of.next-generation sequencing,mainstream sequencing platf.rms,and mNGS workf.ow,and discusses the clinical applications of.mNGS to inf.ctious diseases and its advantages and disadvantages.

关键词： Metagenomics next-generation sequencing(mNGS) Inf.ctious disease Cerebrospinal f.uid(CSf. Oxf.rd Nanopore Technologies(ONT) Microbiome

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Spatial Distribution Pattern and Inf.uencing f.ctors of.Bed-and-breakf.sts(B&Bs)f.om the Perspective of.Urban-rural Dif.erences:A Case Study of.Jiaodong Peninsula,China

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Chinese Geographical Science 2024年第4期34卷 752-763页

作者： WANG Xinyue ma Qian management College Ocean University of ChinaQingdao 266100China

There are signif.cant dif.erences between urban and rural bed-and-breakf.sts(B&Bs)in terms of.customer positioning,economic strength and spatial *** identif.ing the dif.erences in spatial characteristics and inf.uencing f.ctors of.each type,is essential f.r creating urban and rural B&B agglomeration *** study used density-based spatial clustering of.applications with noise(DBSCAN)and the multi-scale geographically weighted regression(MGWR)model to explore similarities and dif.erences in the spatial distribution patterns and inf.uencing f.ctors f.r urban and rural B&Bs on the Jiaodong Peninsula of.China f.om 2010 to *** results showed that:1)both urban and rural B&Bs in Jiaodong Peninsula went through three stages:a slow start f.om 2010 to 2015,rapid development f.om 2015 to 2019,and hindered development f.om 2019 to ***,urban B&Bs demonstrated a higher development speed and agglomeration intensity,leading to an increasingly evident trend of.uneven development between the two sectors.2)The clustering scale of.both urban and rural B&Bs continued to expand in terms of.quantity and *** B&B clusters characterized by a limited number,but a higher likelihood of.transitioning f.om low-level to high-level *** the number of.rural B&B clusters steadily increased over time,their clustering scale was comparatively lower than that of.urban B&Bs,and they lacked the presence of.high-level clustering.3)In terms of.development direction,urban B&B clusters exhibited a relatively stable pattern and evolved into high-level clustering centers within the main urban ***,rural B&Bs exhibited a more pronounced spatial dif.usion ef.ect,with clusters showing a trend of.multi-center development along the coastline.4)Transport emerged as a common inf.uencing f.ctor f.r both urban and rural B&Bs,with the density of.road network having the strongest explanatory power f.r their spatial *** terms of.dif.erences,populati

关键词： urban-rural bed-and-breakf.sts(B&Bs) spatiotemporal evolution density-based spatial clustering of.applications with noise(DBSCAN)model multi-scale geographically weighted regression(MGWR) Jiaodong Peninsula China

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Two-stage aging treatment to accelerate aging kinetics without impairing strength in B_4C/7A04Al composite

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Science China(Technological Sciences) 2024年第8期67卷 2485-2492页

作者： CHEN YunTao ma GuoNan ZHU ShiZe WANG Dong XIAO BoLv ma ZongYi Shi-Changxu Innovation Center f.r Advanced materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of.materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Centre of.Excellence f.r Advanced materials Dongguan 523808China

Aging treatments are the key process to obtain satisf.ctory strength f.r 7xxxAl alloys and their composites. However, traditional single-stage(SS) aging is time-consuming to reach a peak strength condition. In this study, an ef.icient 120℃ + 160℃ two-stage(TS) aging treatment was proposed on a B_4C/7A04Al composite f.bricated via powder metallurgy(PM) technology, which could acquire similar peak-aging strength but only took about 15% of.the time compared to traditional 120℃ SS aging. The evolution of.precipitation during the TS aging was investigated, as well as those of.the 7A04Al alloys f.r comparison. In the second stage aging process, the higher aging temperature accelerated the nucleation of.η′ phases inside the grains and thus increased the density of.precipitates. Moreover, the short aging time limited the coarsening of.precipitates and the broadening of.precipitatef.ee zones. The above f.ctors were benef.cial f.r quickly obtaining satisf.ctory precipitation strengthening ef.ects. The B_4C/7A04Al composite exhibited slower aging kinetics than the 7A04Al alloy in the TS aging. Mg elements consumption by the chemical reaction between B impurities introduced by B_4C particles and the Al matrix was considered to potentially retard the aging kinetics of.the B_4C/7A04Al composite. Nevertheless, the precipitation sequence was not af.ected.

关键词： aluminum matrix composites aging treatment powder metallurgy mechanical properties precipitation

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