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Acta Mathematicae Applicatae Sinica 2024年第2期40卷 539-546页

作者： Wen WANG Da-peng XIE Hui zhou School of Mathematics and Statistics Hefei Normal UniversityHefei 230601China

In this paper,we prove a local Hamilton type gradient estimate for positive solution of the nonlinear parabolic equation ut(x,t)=Δu(x,t)+au(x,t) ln u(x,t)+bu^(α)(x,t),on M×(-∞,∞) with α∈R,where a and b are *** ... 详细信息

关键词： nonlinear parabolic equation gradient estimate Harnack inequality

Resilience and response:Unveiling the impacts of extreme droughts on forests through integrated dendrochronological and remote sensing analyses

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Forest Ecosystems 2024年第4期11卷 491-501页

作者： Han Shi Xi peng Yong-Jiao zhou Ai-Ying Wang Xue-Kai Sun Na Li quan-Sheng Bao Gude Buri Guang-You Hao CAS Key Laboratory of Forest Ecology and Silviculture Institute of Applied EcologyChinese Academy of SciencesShenyang110016China Daqinggou Ecological Research Station Institute of Applied EcologyChinese Academy of SciencesShenyang110016China University of Chinese Academy of Sciences Beijing100049China School of Life Science and Engineering Shenyang UniversityShenyang110044China Wudantala Forestry Forestry and Grassland Administration of Horqin Northeast CountyTongliao028100China

Extreme droughts are anticipated to have detrimental impacts on forest ecosystems,especially in water-limited regions,due to the influence of climate ***,considerable uncertainty remains regarding the patterns in species-specific responses to extreme ***,we conducted a study integrating dendrochronology and remote sensing methods to investigate the mosaic-distributed maple-oak(native)natural forests and poplar plantations(introduced)in the Horqin Sandy Land,Northeast *** assessed the impacts of extreme droughts on tree performances by measuring interannual variations in radial growth and vegetation *** results showed that precipitation and self-calibrated palmer drought severity index(scPDSI)are the major factors influencing tree-ring width index(RWI)and normalized difference vegetation index(NDVI).The severe droughts between 2000 and 2004 resulted in reduced RWI in the three studied tree species as well as led to NDVI reductions in both the maple-oak natural forests and the poplar *** RWI reached the nadir during the2000-2004 severe droughts and remained at low levels two years after the severe drought,creating a legacy *** contrast to the lack of significant correlation between RWI and scPDSI,NDVI exhibited a significant positive correlation with scPDSI indicating the greater sensitivity of canopy performance to droughts than radial ***,interspecific differences in RWI and NDVI responses were observed,with the fast-growing poplar species experiencing a more significant RWI decrease and more negative NDVI anomaly during severe droughts than native species,highlighting the species-specific trade-offs between drought resilience and growth *** study emphasizes the importance of combining tree-level radial growth with landscape-scale canopy remote sensing to understand forest resilience and *** study improves our understanding of forest responses to extreme drought and highlights species di

关键词： Introduced tree species Native tree species NDVI Severe drought Tree-ring width

Multifunctional carbon materials from rugose rose for energy storage and water purification

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Frontiers of Chemical Science and Engineering 2024年第9期18卷 1-13页

作者： peng-Hui Li Hui zhou Wen-Juan Wu Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources Nanjing Forestry UniversityNanjing 210037China College of Light Industry and Food Engineering Nanjing Forestry UniversityNanjing 210037China College of Chemical Engineering East China University of Science and TechnologyShanghai 200237China State Key Laboratory of Chemical Engineering Shanghai 200237China

With the advancement of social process,the resource problem is becoming more prominent,biomass materials come into being,and it is becoming more and more important to explore and prepare efficient and multifunctional biomass materials to alleviate the problems of energy storage and water *** this paper,nitrogen-doped hierarchical porous carbon materials(NRRC)were produced by one-step carbonization of withered rose as raw material and melamine as nitrogen source with KOH-activated *** resulting nitrogen-doped porous carbon material had the most abundant pores and the best microspherical graded pore structure,with a specific surface area of up to 1393 m2·g^(-1),a pore volume of 0.68 cm3·g^(-1),and a nitrogen-doped content of 5.52%.Electrochemical tests showed that the maximum specific capacitance of NRRC in the three-electrode system was 346.4 F·g^(-1)(0.5 A·g^(-1)),which was combined with favorable capacitance retention performance and cycling *** NRRC//NRRC symmetric supercapacitors were further assembled,and the maximum energy density of a single device was 23.88 Wh·kg^(-1),which still maintains excellent capacitance retention and cyclic charging/discharging *** example,the capacitance retention rate was always close to 96.27%with almost negligible capacitance loss after 10000 consecutive charge/discharge cycles(current density:10 A·g^(-1)).Regardless of the three-electrode or two-electrode system,the super capacitive performance of NRRC porous carbon materials was comparable to the electrochemical performance of many reported biomass porous carbon materials,which showed better energy storage advantages and practical application *** addition,NRRC porous carbon materials had excellent water purification *** dye adsorption test confirmed that NRRC had a high adsorption capacity(491.47 mg·g^(-1))for methylene *** undoubtedly also showed a potential and promising avenue for high value-added utilization

关键词： rose carbon adsorption electrode material electrochemical performance

Feature-Grounded Single-Stage Text-to-Image Generation

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Tsinghua Science and Technology 2024年第2期29卷 469-480页

作者： Yuan zhou peng Wang Lei Xiang Haofeng Zhang School of Artificial Intelligence Nanjing University of Information Science and TechnologyNanjing 210044China School of Computer Science and Engineering Nanjing University of Science and TechnologyNanjing 210094China

Recently,Generative Adversarial Networks(GANs)have become the mainstream text-to-image(T2I)***,a standard normal distribution noise of inputs cannot provide sufficient information to synthesize an image that approaches the ground-truth image ***,the multistage generation strategy results in complex T2I ***,this study proposes a novel feature-grounded single-stage T2I model,which considers the“real”distribution learned from training images as one input and introduces a worst-case-optimized similarity measure into the loss function to enhance the model's generation *** results on two benchmark datasets demonstrate the competitive performance of the proposed model in terms of the Frechet inception distance and inception score compared to those of some classical and state-of-the-art models,showing the improved similarities among the generated image,text,and ground truth.

关键词： text-to-image(T2I) feature-grounded single-stage generation Generative Adversarial Network(GAN)

Cross-Dimension Attentive Feature Fusion Network for Unsupervised Time-Series Anomaly Detection

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Computer Modeling in Engineering & Sciences 2024年第6期139卷 3011-3027页

作者： Rui Wang Yao zhou Guangchun Luo peng Chen Dezhong peng School of Computer Science and Engineering University of Electronic Science and Technology of ChinaChengdu611731China School of Computer and Software Engineering Xihua UniversityChengdu610039China School of Computer Science Sichuan UniversityChengdu610065China National Innovation Center for UHD Video Technology Chengdu610095China

Time series anomaly detection is crucial in various industrial applications to identify unusual behaviors within the time series *** to the challenges associated with annotating anomaly events,time series reconstruction has become a prevalent approach for unsupervised anomaly ***,effectively learning representations and achieving accurate detection results remain challenging due to the intricate temporal patterns and dependencies in real-world time *** this paper,we propose a cross-dimension attentive feature fusion network for time series anomaly detection,referred to as ***,a series and feature mixing block is introduced to learn representations in 1D ***,a fast Fourier transform is employed to convert the time series into 2D space,providing the capability for 2D feature ***,a cross-dimension attentive feature fusion mechanism is designed that adaptively integrates features across different dimensions for anomaly *** results on real-world time series datasets demonstrate that CAFFN performs better than other competing methods in time series anomaly detection.

关键词： Time series anomaly detection unsupervised feature learning feature fusion

The Protective Effect of Electroacupuncturing Zusanli Points on Hemorrhagic Shock Rats through Cholinergic Anti-inflammatory Pathway

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生物医学工程学杂志 2005年第S1期22卷 151-152页

作者： Zhao-Hui DU Jian-Guo LI Yan-Lin WANG zhou-quan peng, Xiao-Feng YE(Department of ICU, Zhongnan Hospital, Wuhan University,Wuhan 430071,China) Department of ICU Zhongnan Hospital Wuhan University Wuhan 430071 China

1 IntroductionIn conditions of circulatory shock, systemic inflammatory response (SIRS) plays a funda mental pathogenetic role, with activation of transcription nuclear factors(mainly NF- kB) and markedly increased production of cytokines (mainly TNF-a), which trigger the inflammatory cascade active ation. Recent research have identified a basic neural pathway that reflexively monitors and adjusts such response. It is through the rapid activation (in 'real-time') of efferent vagus nerve fibres(the recentlyrecognized 'brain cholinergic antiinflammatory pathway' ) [1].There are show that the rapid activation cholinergic antiinflammatory pathway can protect against the hemorrhagic shock[2,3].

关键词： EA The Protective Effect of Electroacupuncturing Zusanli Points on Hemorrhagic Shock Rats through Cholinergic Anti-inflammatory Pathway

Sulphur-template method for facile manufacturing porous silicon electrodes with enhanced electrochemical performance

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Chinese Chemical Letters 2024年第8期35卷 433-436页

作者： peng zhou Ziang Jiang Yang Li peng Xiao Feixiang Wu Powder Metallurgy Research Institute School of Metallurgy and EnvironmentCentral South UniversityChangsha 410083China

Sulphur(S)-template method based on conventional slurry-casting method has been developed to pro-duce porous silicon(Si)*** facile fabrication technology is suitable for current production line and expected to be widely applied to various electrode materials under large volume change during ***,S particles as template agent are mixed with active material Si,carbon conductor and binder forming uniform *** casting and drying,the electrodes are immersed in carbon disul-fide solution to remove S particles rapidly,generating pores in-situ at the original position of S *** analysis shows that the pores inside electrodes are able to shorten lithium ion diffusion paths,reduce normal expansion rate and decrease formation of cracks in the Si electrode(2 mg_(Si)/cm^(2)),demonstrating a reversible capacity of 951 mAh/g at 0.5 A/g after 100 cycles(with a capacity retention of 99.5%)and a capacity of-826 mAh/g at 2 A/g.

关键词： Sulphur-template Porous electrodes Silicon anodes Low volume expansion Lithium-ion batteries

Dynamics of a predator-prey system with sublethal effects of pesticides on pests and natural enemies

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International Journal of Biomathematics 2024年第1期17卷 151-175页

作者： Xiangjun Dai Jianjun Jiao Qi quan Airen zhou School of Mathematical Sciences Guizhou Normal University Guiyang 550025P.R.China School of Mathematics and Statistics Guizhou University of Finance and Economics Guiyang 550025 P.R.China School of Date Science Tongren University Tongren 554300P.R.China

Considering the influence of sublethal concentration of pesticides on pests and natural enemies,we propose a pest-management model with impulsive effect on chemical control and biological control strategies periodic spraying pesticide and releasing predatory natural *** using the Floquet theory and the comparison theorem of impulsive differential equations,a sufficient condition for the global asymptotic stability of the pest-eradication periodic solution is *** persistence of the system is further studied,and a sufficient condition for the persistence of the system is ***,some numerical simulations are shown to verify our theoretical *** works indicate that the sublethal effects of insecticides and the release of predatory natural enemies play significant roles in pest control in agricultural production.

关键词： Predator-prey system sublethal effect global asymptotic stability permanence

Mechanical and damping performances of TPMS lattice metamaterials fabricated by laser powder bed fusion

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China Foundry 2024年第4期21卷 327-333页

作者： Yan-peng Wei Huai-qian Li Jing-jing Han Ying-chun Ma Hao-ran zhou Jing-chang Cheng Jian Shi Zhi-quan Miao Bo Yu Feng Lin National Key Laboratory of Advanced Casting Technologies Shenyang Research Institute of Foundry Co.Ltd.CAMShenyang 110022China Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China Key Laboratory of Space Physics Beijing 100076China

Lattice metamaterials based on three-period minimum surface(TPMS)are an effective means to achieve lightweight and high-strength materials which are widely used in various fields such as aerospace and ***,its vibration and noise reduction,and damping properties have not been fully ***,in this study,the TPMS structures with parameterization were designed by the method of surface migration,and the TPMS structures with high forming quality was manufactured by laser powder bed fusion(LPBF).The mechanical properties and energy absorption characteristics of the beam and TPMS structures were studied and compared by quasi-static *** modal shapes of the beam lattice structures and TPMS structures were obtained by the free modal analysis,and the damping properties of two structures were obtained by modal *** the two structures after heat treatment with the same porosity of 70%,the yield strength of the beam lattice structure reaches 40.76 MPa,elastic modulus is 20.38 GPa,the energy absorption value is 32.23 MJ·m^(-3),the damping ratio is 0.52%.The yield strength,elastic modulus,energy absorption value,and damping ratio of the TPMS structure are 50.74 MPa,25.37 GPa,47.34 MJ·m^(-3),and 0.99%,*** results show that TPMS structures exhibit more excellent mechanical properties and energy absorption,better damping performance,and obvious advantages in structural load and vibration and noise reduction compared with the beam lattice structures under the same porosity.

关键词： lattice metamaterials TPMS energy absorption damping laser powder bed fusion

High Hydrostatic Pressure Exacerbates Bladder Fibrosis through Activating Piezo1

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当代医学科学（英文） 2024年第4期44卷 718-725页

作者： Bo-lang DENG Dong-xu LIN Zhi-peng LI Kang LI peng-yu WEI Chang-cheng LUO Meng-yang ZHANG quan zhou Zheng-long YANG Zhong CHEN Department and Institute of Urology Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China Department of Rehabilitation Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China School of Mechanical Science and Engineering Huazhong University of Science and TechnologyWuhan 430074China

Objective:Bladder outlet obstruction(BOO)results in significant fibrosis in the chronic stage and elevated bladder ***1 is a type of mechanosensitive(MS)channel that directly responds to mechanical *** identify new targets for intervention in the treatment of BOO-induced fibrosis,this study investigated the impact of high hydrostatic pressure(HHP)on Piezo1 activity and the progression of bladder ***:Immunofluorescence staining was conducted to assess the protein abundance of Piezo1 in fibroblasts from obstructed rat *** fibroblasts were cultured under normal atmospheric conditions(0 cmH2O)or exposed to HHP(50 cmH2O or 100 cmH2O).Agonists or inhibitors of Piezol,YAP1,and ROCK1 were used to determine the underlying ***:The Piezo1 protein levels in fibroblasts from the obstructed bladder exhibited an elevation compared to the control *** significantly promoted the expression of various pro-fibrotic factors and induced proliferation of ***,the protein expression levels of Piezol,YAP1,ROCK1 were elevated,and calcium influx was increased as the pressure *** effects were attenuated by the Piezol inhibitor *** Piezo1 activator Yoda1 induced the expression of pro-fibrotic factors and the proliferation of fibroblasts,and elevated the protein levels of YAP1 and ROCK1 under normal atmospheric conditions in ***,these effects could be partially inhibited by YAP1 or ROCK ***:The study suggests that HHP may exacerbate bladder fibrosis through activating Piezo1.

关键词： Piezo1 bladder outlet obstruction fibrosis high hydrostatic pressure