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Synchronous deprotonation–protonation for mechanically robust chitin/aramid nanofibers conductive aerogel with excellent pressure sensing, thermal management, and electromagnetic interference shielding

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Nano Research 2024年第3期17卷 2038-2049页

作者： Xinxin Zhang Kunpeng Qian Jianhui fang Sineenat Thaiboonrod Miao Miao Xin Feng Department of chemistry College of SciencesShanghai UniversityShanghai 200444China Research center of Nano Science and Technology College of SciencesShanghai UniversityShanghai 200444China School of Materials Sciences and Engineering Shanghai UniversityShanghai 200444China National Nanotechnology center(NANOTEc) National Science and Technology Development Agency(NSTDA)Thailand Science ParkPathum Thani 12120Thailand

Aerogels with regularly porous structure and uniformly distributed conductive networks have received extensive attention in wearable electronic sensors,electromagnetic shielding,and so ***,the poor mechanical properties of the emerging nanofibers-based aerogels are limited in practical *** this work,we developed a synchronous deprotonation–protonation method in the KOH/dimethyl sulfoxide(DMSO)system at room temperature for achieving chitin cross-linked aramid nanofibers(cANFs)rather than chitin nanofibers(chNFs)and aramid nanofibers(ANFs)separately by using chitin and aramid pulp as raw *** freeze-drying process,the cross-linked chitin/aramid nanofibers(cA)aerogel exhibited the synergetic properties of chNF and ANF by the dual-nanofiber compensation *** mechanical stress of cA aerogel was 170 kPa at 80%compressive strain,increased by 750%compared with pure chNF ***,the compressibility of cA aerogel was somewhat improved compared to ANF *** enhancement verified that the crosslinking reaction between ANF and chNF during the synchronous deprotonation process was ***,the conductive aerogels with uniform porous structure(cA-M)were successfully obtained by vacuum impregnating cA aerogels in Ti_(3)c_(2)T_(x) MXene solution,displaying low thermal conductivity(0.01 W/(m·K)),high electromagnetic interference(EMI)shielding effectiveness(SE)(75 dB),flame retardant,and heat ***,the as-obtained cA-M aerogels were also applied as a pressure sensor with excellent compression cycle stability and superior human motion monitoring *** a result,the dual-nanofiber based conductive aerogels have great potentials in flexible/wearable electronics,EMI shielding,flame retardant,and heat insulation.

关键词： synchronous deprotonation–protonation electromagnetic interference(EMI)shielding flame retardant heat insulation pressure sensing

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Synergy enhancement of co single atoms and asymmetric subnanoclusters for Fenton-like activation

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Nano Research 2024年第9期17卷 7935-7944页

作者： Ming Ma Zhiyi Sun Ziwei Deng Xiang Li fang Zhang Wenxing chen School of Materials Key Laboratory of Cluster Science Ministry of EducationBeijing Key Laboratory of Photoelectronic/Electrophotonic Conversion MaterialsAdvanced Technologies Research Institute(Jinan)Advanced Research Institute of Multidisciplinary ScienceSchool of Chemistry and Chemical EngineeringBeijing Institute of TechnologyBeijing 100081China Energy and catalysis center School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Analysis and Testing center Beijing Institute of TechnologyBeijing Institute of TechnologyBeijing 100081China

As a new water treatment technology,Fenton-like reaction has great *** this study,we successfully prepared an excellent Fenton-like catalyst,which is composed of cobalt monoatoms and asymmetric subnanoclusters(labeled coSA/clu-c_(2)N),and exhibits excellent peroxymonosulfate(PMS)activation *** directly comparing the catalytic properties of coSA-c_(2)N and coSA/clu-c_(2)N,the synergistic effects of coasymmetric co subclusters and co atoms on the activation of PMS and degradation of organic micropollutants were *** results showed that coSA/clu-c_(2)N had higher degradation rates of carbamazepine(cBZ),antipyrine(AT)and chlorobenzoic acid(cA)when combined with active oxidant *** cyclic frequency of cBZ was 5.4 min^(-1),which was twice as high as the catalytic constant of coSA-c_(2)N(2.4 min^(-1)).The results show that coSA/clu-c_(2)N cobalt subnanoclusters and cobalt single atom can synergistically improve the catalytic performance of activated PMS oxidation of micropollutants in *** addition,electron paramagnetic resonance(EPR)technology has proved that the introduction of co subnano clusters in coSA/clu-c_(2)N is conducive to the production of singlet oxygen(1O_(2)),thereby improving the efficiency of pollutant *** work lays a solid foundation for the future design of advanced multifunctional catalysts by carefully regulating and combining monmetallic atoms and metal subnanoclusters.

关键词： carbamazepine Fenton-like reaction co single atoms asymmetrical sub-nanoclusters peroxymonosulfate synergy enhancement

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construction of remote cyano-substituted quaternary carbon centers via nickel-catalyzed migratory hydrocyanation of unconjugated dienes

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Science china chemistry 2024年第10期67卷 3397-3405页

作者： Yidan Xing Rongrong Yu Mingdong Jiao Ting Wang Xianjie fang Key Laboratory of Organosilicon chemistry and Material Technology of Ministry of Education Key Laboratory of Organosilicon Material Technology of Zhejiang ProvinceCollege of MaterialChemistry and Chemical EngineeringHangzhou Normal UniversityHangzhou 311121China Shanghai Key Laboratory for Molecular Engineering of chiral Drugs School of Chemistry and Chemical EngineeringShanghai Jiao Tong UniversityShanghai 200240China

The transition-metal-catalyzed migratory functionalization has emerged as a robust protocol for the building of c–c bonds remote from the“initiation”***,a similar strategy for the construction of quaternary carbon centers is still underdeveloped and only a limited number of reports ***,we report a nickel-catalyzed migratory hydrocyanation of unconjugated dienes to construct remote cyano-substituted quaternary carbon *** transformation features exceptional regioselectivity,mild reaction conditions,broad substrate scope and high *** synthetic utility of this method has been highlighted by a series of product derivatizations,and the potential of this transformation has been extended to synthesize TRPV1 antagonist and the key intermediate in the total synthesis of *** functional theory(DFT)studies unveiled that the specific catalytic pocket assumed a significant role in the selective formation of cyano-substituted quaternary carbon centers.

关键词： chain-walking regioselectivity remote cyanation quaternary carbon centers unconjugated dienes

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convenient room-temperature synthesis of sulfur and nitrogen co-doped Nico-LDH coupled with cNTs on Nico foam as battery-type electrode for high performance hybrid supercapacitor

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Rare Metals 2024年第9期43卷 4286-4301页

作者： Li Song Xiao-Hong Zhong fang-Lin Wang Zhi-Hui Huang Zhe Hong Yun-fang Gao Hai-Dong Wang Jian-Wei Ren Sheng-Jie Peng Lei Li college of Biological Chemical Sciences and EngineeringJiaxing UniversityJiaxing 314001China college of chemical Engineering Zhejiang University of TechnologyHangzhou 310014China college of Materials Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 210016China Research and Development Department Jiangxi Ganfeng LiEnergy Technology Co.Ltd.Xinyu 338000China Department of Mechanical Engineering Science University of JohannesburgAuckland ParkJohannesburg 2092South Africa

The convenient synthesis of the composite electrode with high supercapacitance performance plays an important role in practical application but is ***,the carbon nanotubes(cNTs)coupled with lowcrystalline sulfur and nitrogen co-doped Ni co-LDH(denoted as SN-Ni co-LDH)nanosheets array are grown on Ni co foam(NcF)substrate by two convenient steps of metal induced self-assembly and corrosion engineering,which present the advantages of operating at roomtemperature and low preparation *** from the S–N co-doping and low-crystallinity of Ni co-LDH,the prepared SN-Ni co-LDH@cNTs@NcF electrode presents a topping charge capacity of 2470 c·g^(-1)(4.94 c·cm^(-2))at 5 m A·cm^(-2).Furthermore,the fabricated asymmetry supercapacitor(ASc)achieves an extraordinary energy density of 77 Wh·kg^(-1)(0.617 m Wh·cm^(-2))at a power density of 438 W·kg^(-1)(3.5 m W·cm^(-2))and outstanding stability(91%capacity retention after 5000 cycles at20 m A·cm^(-2)).Impressively,the structure evolution of Ni co-LDH during the charge/discharge processes has been thoroughly elucidated by in-situ Raman ***,this work verifies a powerful strategy and practical value for preparing composite electrodes with high supercapacitance performance,and also provides guidance for the rational design of the smart electrodes.

关键词： Supercapacitor Nico-LDH carbon nanotubes Sulfur and nitrogen co-doped convenient synthesis

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No Incidence of Liver cancer Was Observed in A Retrospective Studyof Patients with Aristolochic Acid Nephropathy

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chinese Journal of Integrative Medicine 2024年第2期30卷 99-106页

作者： SU Tao fang Zhi-e GUO Yu-ming WANG chun-yu WANG Jia-bo JI Dong BAI Zhao-fang YANG Li XiAO Xiao-he Renal Division Department of MedicinePeking University First HospitalBeijing(100034)China Department of Pharmacy Chongqing Hospital of Traditional Chinese MedicineChongqing(400021)China Department of Hepatology Fifth Medical Center of Chinese PLA General HospitalBeijing(100039)China china Military Institute of chinese Materia Fifth Medical Center of Chinese PLA General HospitalBeijing(100039)China Phase I clinical Trials Unit Department of Medicine for Infectious DiseasesFifth Medical Center of Chinese PLA General HospitalBeijing(100039)China Department of Pharmacy Affiliated Hospital of Shandong University of Traditional Chinese MedicineJinan(250000)China National Key Laboratory of Kidney Diseases Beijing(100039)China

Objective:To assess the risk of aristolochic acid(AA)-associated cancer in patients with AA nephropathy(AAN).Methods:A retrospective study was conducted on patients diagnosed with AAN at Peking University First Hospital from January 1997 to December ***-term surveillance and follow-up data were analyzed to investigate the influence of different factors on the prevalence of *** primary endpoint was the incidence of liver cancer,and the secondary endpoint was the incidence of urinary cancer during 1 year after taking AA-containing medication to ***:A total of 337 patients diagnosed with AAN were included in this *** the initiation of taking AA to the termination of follow-up,39 patients were diagnosed with *** cases of liver cancer were observed throughout the entire follow-up period,with urinary cancer being the predominant type(34/39,87.17%).Logistic regression analysis showed that age,follow-up period,and diabetes were potential risk factors,however,the dosage of the drug was not significantly associated with urinary ***:No cases of liver cancer were observed at the end of ***,a high prevalence of urinary cancer was observed in AAN *** a direct causality between AA and Hcc is challenging.

关键词： aristolochic acid hepatocellular carcinoma urinary cancer drug safety retrospective study

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Newtonian limit of Einstein equation with a cosmological constant

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chinese Physics c 2024年第10期48卷 264-274页

作者： Li-fang Li Zhoujian cao Xiaokai He Institute of Mechanics Chinese Academy of SciencesBeijing 100190China Institute of Applied Mathematics Academy of Mathematics and Systems ScienceChinese Academy of SciencesBeijing 100190China School of Fundamental Physics and Mathematical Sciences Hangzhou Institute for Advanced StudyUCASHangzhou 310024China School of Mathematics and Statistics Hunan First Normal UniversityChangsha 410205China

Traditionally,the cosmological constant has been viewed as dark energy that mimics matter with negative *** that matter with negative energy provides a repulsive force,which fundamentally differs from typical gravitational forces,it has been believed that the cosmological constant effectively contributes a repulsive ***,it is important to note that the concept of gravitational force is valid only within the framework of Newtonian *** this study,we demonstrate that the traditional understanding of the gravitational force contributed by the cosmological constant is not entirely *** approach involves investigating the Newtonian limit of the Einstein equation with a cosmological *** subtleties involved in this analysis are discussed in ***,we find that the effect of the cosmological constant on Newtonian gravity is an attractive force rather than a repulsive one for ordinary *** expected,this corrective force is negligibly ***,our findings may offer a way to distinguish between dark energy and the cosmological constant,as one contributes a repulsive force while the other contributes an attractive force.

关键词： cosmological constant dark matter Einstein equation Newtonian limit dark energy

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Genetic analyses of ancient tea trees provide insights into the breeding history and dissemination of chinese Assam tea(camellia sinensis ***)

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Plant Diversity 2024年第2期46卷 229-237页

作者： Miao-Miao Li Muditha K.Meegahakumbura Moses c.Wambulwa Kevin S.Burgess Michael Möller Zong-fang Shen De-Zhu Li Lian-Ming Gao cAS Key Laboratory for Plant Diversity and Biogeography of East Asia Kunming Institute of BotanyChinese Academy of ScienceKunming650201China Germplasm Bank of Wild Species Kunming Institute of BotanyChinese Academy of ScienceKunming650201China Kunming college of Life Science University of Chinese Academy of SciencesKunming650201YunnanChina Department of Export Agriculture Faculty of Animal Science and Export AgricultureUva Wellassa UniversityBadulla90000Sri Lanka Department of Life Sciences School of Science and ComputingSouth Eastern Kenya University170-90200KituiKenya Department of Biology Columbus State UniversityUniversity System of GeorgiaColumbusGA31907-5645USA Royal Botanic Garden Edinburgh 20A Inverleith RowEdinburghEH35LRScotlandUK Lijiang Forest Biodiversity National Observation and Research Station Kunming Institute of BotanyChinese Academy of SciencesLijiang674100YunnanChina

chinese Assam tea(camellia sinensis ***)is an important tea crop with a long history of cultivation in Yunnan,*** its potential value as a genetic resource,its genetic diversity and domestication/breeding history remain *** address this issue,we genotyped 469 ancient tea plant trees representing 26 *** *** populations,plus two of its wild relatives(six and three populations of *** and ***,respectively)using 16 nuclear microsatellite *** showed that chinese Assam tea has a relatively high,but comparatively lower gene diversity(H_(S)=0.638)than the wild relative ***(H_S=0.658).clustering in STRUcTURE indicated that chinese Assam tea and its two wild relatives formed distinct genetic groups,with considerable interspecific *** chinese Assam tea accessions clustered into three gene pools,corresponding well with their geographic ***,New Hybrids analysis indicated that 68.48%of ancient chinese Assam tea plants from Xishuangbanna were genetic intermediates between the Puer and Lincang gene *** addition,10%of the ancient chinese Assam tea individuals were found to be hybrids between chinese Assam tea and *** results suggest that chinese Assam tea was domesticated separately in three gene pools(Puer,Lincang and Xishuangbanna)in the Mekong River valley and that the hybrids were subsequently selected during the domestication *** the domestication history of chinese Assam tea in southwestern Yunnan remains complex,our results will help to identify valuable genetic resources that may be useful in future tea breeding programs.

关键词： Tea plant Hybrid origin Genetic diversity Domestication history camellia sinensis var.assamica camellia taliensis

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Explainable-AI-based two-stage solution for WSN object localization using zero-touch mobile transceivers

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Science china(Information Sciences) 2024年第7期67卷 27-45页

作者： Kai fang Junxin cHEN Han ZHU Thippa Reddy GADEKALLU Xiaoping WU Wei WANG School of Mathematics and computer Science Zhejiang A&F University School of Software Dalian University of Technology Faculty of Applied Sciences Macao Polytechnic University Department of Electrical and computer Engineering Lebanese American University School of Information Engineering Huzhou University Guangdong-Hong Kong-Macao Joint Laboratory for Emotional Intelligence and Pervasive computing Artificial Intelligence Research Institute Shenzhen MSU-BIT University

Artificial intelligence technology is widely used in the field of wireless sensor networks(WSN).Due to its inexplicability, the interference factors in the process of WSN object localization cannot be effectively eliminated. In this paper, an explainable-AI-based two-stage solution is proposed for WSN object localization. In this solution, mobile transceivers are used to enlarge the positioning range and eliminate the blind area for object localization. The motion parameters of transceivers are considered to be unavailable,and the localization problem is highly nonlinear with respect to the unknown parameters. To address this,an explainable AI model is proposed to solve the localization problem. Since the relationship among the variables is difficult to fully include in the first-stage traditional model, we develop a two-stage explainable AI solution for this localization problem. The two-stage solution is actually a comprehensive consideration of the relationship between variables. The solution can continue to use the constraints unused in the firststage during the second-stage, thereby improving the performance of the solution. Therefore, the two-stage solution has stronger robustness compared to the closed-form solution. Experimental results show that the performance of both the two-stage solution and the traditional solution will be affected by numerical changes in unknown parameters. However, the two-stage solution performs better than the traditional solution, especially with a small number of mobile transceivers and sensors or in the presence of high noise. Furthermore,we have also verified the feasibility of the proposed explainable-AI-based two-stage solution.

关键词： explainable AI object localization semidefinite relaxation mobile transceiver two-stage solution closed-form solution

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Superatomic Ag_(58) nanoclusters incorporating a [MS_(4)@Ag_(12)]^(2+)(M = Mo or W) kernel show aggregation-induced emission

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chinese chemical Letters 2024年第10期35卷 452-456页

作者： Jun-Jie fang Zheng Liu Yun-Peng Xie Xing Lu State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

In core-shell silver nanoclusters,the control of core structure presents a more formidable challenge compared to that of the shell ***,we report the successful synthesis and characterization of four distinct silver thiolate nanoclusters[MS_(4)@Ag_(12)@Ag_(46)S_(24)(dppb)_(12)](M=Mo or W),each incorporating a cup-like[MS_(4)@Ag_(12)]^(2+)*** nanoclusters were meticulously prepared using(NH_(4))2Mo S4or(NH_(4))_(2)WS_(4)as both a template and a controlled source of ***,we have observed a unique configuration within these eight-electron superatomic Ag_(58) nanoclusters,where the zerovalent Ag atoms reside exclusively within the inner[MS_(4)@Ag_(12)]^(2+)*** stands in contrast to other superatomic clusters possessing an Ag(0)***,the introduction of phenyl-containing compounds during the synthesis process induced a transformation in the space group symmetry from c_(2)/c to I 4ˉ.This transformative effect was found to originate from the interplay between adjacent 1,4-bis(diphenylphosphino)butane(dppb)ligands,which facilitated enhanced emission through aggregationinduced intermolecular interactions,specifically c-H···π***,our findings contribute substantively to the understanding of the intricate relationship between nanocluster structures and their corresponding properties,shedding light on the crucial roles played by templates and diphosphine ligands in this context.

关键词： Superatom Silver nanocluster Template synthesis Photoluminescence Aggregation-induced emission

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Research on the identification of the production origin of Angelica dahurica using LIBS technology combined with machine learning algorithms

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Optoelectronics Letters 2024年第3期20卷 171-176页

作者： SUN Jiaxing LI Honglian YAO Yuhang YAN Qiongyan DONG fang college of Quality and Technology Supervising Hebei UniversityBaoding 071000China National and Local Joint Engineering center of Measuring Instruments and Metrology Systems Baoding 071000China Key Laboratory of Energy Measurement and Safety Detection Technology in Hebei Province Baoding 071000China

The origin of Angelica dahurica medicinal herbs varies, and their pharmacological effects also differ. In order to achieve rapid and accurate identification of the origin of Angelica dahurica medicinal herbs, this study utilizes laser induced breakdown spectroscopy(LIBS) technology combined with machine learning algorithms to identify the original source of Angelica dahurica. Sliced samples of Angelica dahurica were taken from four regions: Hebei, Henan, Zhejiang, and Sichuan. The spectral data from the sliced samples were used as features, and different algorithms including support vector machine(SVM), back propagation(BP) neural network, genetic algorithm-back propagation(GA-BP) neural network, particle swarm optimization-back propagation(PSO-BP) neural network, convolutional neural network(cNN), and cNN-SVM were employed to classify the origin of Angelica dahurica samples.

关键词： neural origin network

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