检索结果-南通市图书馆

Homoclinic Solutions for a Class of Perturbed Fractional Hamiltonian Systems with Subquadratic Conditions

在线全文

学校读者我要写书评

暂无评论

Acta mathematica Sinica,English Series 2024年第5期40卷 1177-1196页

作者： Ying luo Fei GUO Yan LIU School of mathematics Tianjin UniversityTianjin 300354P.R.China Tianjin Key Laboratory of Brain-Inspired Intelligence Technology Tianjin300354P.R.China

In this paper,we consider the following perturbed fractional Hamiltonian systems{tD_(∞)^(α)(_(-∞)D_(t)^(α)u(t))+L(t)u(t)=■_(u)W(t,u(t))+■(u)G(t,u(t)),t∈R,u∈H^(α)(R,R^(n)),whereα∈(1/2,1],L∈C(R,R^(n×n))is symmetric and not necessarily required to be positive definite,W∈C1(R×R^(n,R))is locally subquadratic and locally even near the origin,and perturbed term G∈C1(R×R^(n,R))maybe has no parity in *** the perturbed method improved by the authors,a sequence of nontrivial homo clinic solutions is obtained,which generalizes previous results.

关键词： Perturbed fractional Hamiltonian systems subquadratic condition perturbed method homoclinic solutions multiplicity

Infinitely m.ny Solutions for a Class of Quasi-linear Elliptic Problem

在线全文

学校读者我要写书评

暂无评论

Acta mathematicae Applicatae Sinica 2024年第3期40卷 728-743页

作者： Xiao-yao JIA Zhen-luo LOU School of Economics and m.nagem.nt Zhongyuan University of TechnologyZhengzhou 450007China mathematics and Statistics School Henan University of Science and TechnologyLuoyang 471023China

In this paper,we study the following quasi-linear elliptic equation:■where Ω?R^(n) is a bounded domain,λ>0 is a *** function ψ(|t|)t is the subcritical term,and φ(|t|)t is the critical Orlicz-Sobolev growth term with respect to φ.Under appropriate conditions on φ,ψ and φ,we prove the existence of infinitely m.ny weak solutions for quasi-linear elliptic equation,for λ∈(0,λ_(0)),where λ_(0)> 0 is a fixed constant.

关键词： quasi-linear elliptic equations variational methods Orlicz-Sobolev spaces

Elevational patterns of warm.ng effects on plant comm.nity and topsoil properties: focus on subalpine meadows ecosystem

在线全文

学校读者我要写书评

暂无评论

Journal of mountain Science 2024年第1期21卷 146-159页

作者： HAO Aihua luo Zhengm.ng CHEn Xiaojiang Departm.nt of Geography Xinzhou Normal UniversityXinzhou 034000China Departm.nt of Biological Sciences Xinzhou Normal UniversityXinzhou 034000China

Climate warm.ng profoundly affects plant biodiversity, comm.nity productivity, and soil properties in alpine and subalpine grassland ecosystems. However, these effects are poorly understood across elevational gradients in subalpine meadow ecosystems. To reveal the elevational patterns of warm.ng effects on plant biodiversity, comm.nity structure, productivity, and soil properties, we conducted a warm.ng experim.nt using open-top chambers from August 2019 to August 2022 at high(2764 m a. s. l.), medium(2631 m a. s. l.), and low(2544 m a. s. l.) elevational gradients on a subalpine meadow slope of mount Wutai, northern China. Our results showed that three years of warm.ng significantly increased topsoil temperature but significantly decreased topsoil moisture at all elevations(Pnd the percentage of increasing temperature and decreasing moisture both gradually raised with elevation lifting. Warm.ng-induced decreasing proportions of soil organic carbon(SOC, by 19.24%), and total nitrogen(Tn, by 24.56%) were the greatest at high elevational gradients. Experim.ntal warm.ng did not affect topsoil C: n, p H, nO_(3)^(-)-n, or nH_(4)^(+)-n at the three elevational gradients. Warm.ng significantly increased species richness(Pnd Shannon-Weiner index(Pnal gradients but significantly decreased belowground biomass(Pm at three elevational gradients. Warm.ng caused significant increases in the aboveground biomass in the three elevational plots. Warm.ng significantly increased the aboveground biomass of gram.noids in medium(by 92.47%) and low(by 98.25%) elevational gradients, that of sedges in high(by 72.44%) and medium(by 57.16%) elevational plots, and that of forbs in high(by 75.88%), medium(by 34.38%), and low(by 74.95%) elevational plots. Species richness had significant linear correlations with SOC, Tn, and C: n(Pnificant nonlinear responses to soil temperature and soil moisture in the warmed treatm

关键词： Warm.ng effect Plant diversity pattern Comm.nity structure change Elevation gradient Alpine meadow ecosystem mount Wutai

Stress triggering effect on the 2022 Honghe m_(S)5.0 earthquake with historical strong earthquakes

在线全文

学校读者我要写书评

暂无评论

Geodesy and Geodynamics 2024年第2期15卷 107-113页

作者： m.ngce Wang Zifeng Liu Ruijie luo Yunnan Earthquake Agency Kunming 650224China School of Earth Sciences Yunnan UniversityKunming 650504China

The 2022 Honghe m_(S)5.0 seismic event is intriguing due to its occurrence in the south of the Red River Fault,an area historically lacking seismic activities greater than m_(S)*** elucidate the seismogenic mechanism and scrutinize stress-triggered interactions,we calculated co-seismic and post-seismic Coulomb stress alterations induced by nine historical seismic events(m≥6.0).The analysis reveals that these substantial seismic events provoked co-seismic stress augm.ntations of 1.409 bar and postseismic stress increm.nts of 0.159 *** seismic events,such as the 1833 Songm.ng,1877Shiping,1913 Eshan,and 1970 Tonghai earthquakes,catalyzed the occurrence of the Honghe *** of heightened future seismic risk include the southern region of the Red River Fault and the eastern segm.nts of the Shiping-Jianshui and Qujiang ***,we assessed the correlation between the spatial distribution of aftershocks and the Coulomb stress shift triggered by the mainshock,taking into account the influence of calculation parameter settings.

关键词： Honghe ms5.0 earthquake Coulomb failurestress Stress triggering Historical strongearthquakes

Photoinduced superlubricity on TiO_(2) surfaces

在线全文

学校读者我要写书评

暂无评论

Friction 2024年第3期12卷 428-438页

作者： Ke HAn Liran mA Yu TIAn Jianbin luo State Key Laboratory of Tribology in Advanced Equipm.nt Tsinghua UniversityBeijing 100084China Received:16 September 2022/Revised:28 October 2022/Accepted:27 December 2022The author(s)2022.

Superlubricity control is of great interest in both industry and scientific research,and several methods have been proposed to achieve this *** this work,ultraviolet(UV)light was introduced into titanium dioxide(TiO_(2))and silicon nitride(Si_(3)n_(4))tribosystems to accomplish photoinduced *** friction coefficients(COFs)between Si_(3)n_(4) balls and TiO_(2) plates in the mixtures of sulfuric acid(H^(2)SO_(4))solution and glycerol solution were obviously reduced,and the system entered the superlubricity region(COFm.nation at a speed of 56 mm/***,the COF was much larger without UV treatm.nt than that with UV *** formation of silica(SiO_(2))layers on the surfaces of Si_(3)n_(4) balls and the elastohydrodynamic effects were determ.ned to be fundam.ntal to the low friction in this experim.nt,and the enhancem.nt of the combination between the TiO_(2) surface and the hydroxy group of glycerol by UV illum.nation was the key to the photoinduced superlubricity in this *** findings showed one method for achieving superlubricity by introducing a light field that could be further applied to special working conditions.

关键词： light control friction superlubricity glycerol titanium dioxide(TiO_(2))

Lum.nescence regulation of Sb^(3+)in 0D hybrid metal halides by hydrogen bond network for optical anti-counterfeiting

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Opto-Electronic Advances 2024年第3期7卷 15-25页

作者： Dehai Liang Saif m.H.Qaid Xin Yang Shuangyi Zhao Binbin luo Wensi Cai Qingkai Qian Zhigang Zang Key Laboratory of Optoelectronic Technology&Systems(m.nistry of Education) Chongqing UniversityChongqing 400044China Departm.nt of Physics&Astronomy College of SciencesKing Saud UniversityP.O.Box 2455Riyadh 11451Saudi Arabia Departm.nt of Chemistry and Chemical Engineering Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong ProvinceShantou UniversityShantou 515063China Departm.nt of Oil Army Logistics Academy of PLAChongqing 401311China

The Sb^(3+) doping strategy has been proven to be an effective way to regulate the band gap and improve the photophysical properties of organic-inorganic hybrid metal halides(OIHmHs).However,the emission of Sb^(3+) ions in OIHmHs is primarily confined to the low energy region,resulting in yellow or red *** date,there are few reports about green emission of Sb^(3+)-doped ***,we present a novel approach for regulating the lum.nescence of Sb^(3+) ions in 0D C_(10)H_(2)_(2)n_(6)InCl_(7)·H_(2)O via hydrogen bond network,in which water molecules act as agents for hydrogen ***^(3+)-doped C_(10)H_(2)2n_(6)InCl_(7)·H_(2)O shows a broadband green emission peaking at 540 nm and a high photolum.nescence quantum yield(PLQY)of 80%.It is found that the intense green emission stems from the radiative recombination of the self-trapped excitons(STEs).Upon removal of water molecules with heat,C_(10)H_(2)_(2)n_(6)In_(1-x)Sb_(x)Cl_(7) generates yellow emis-sion,attributed to the breaking of the hydrogen bond network and large structural distortions of excited *** water molecules are adsorbed by C_(10)H_(2)_(2)n_(6)In_(1-x)Sb_(x)Cl_(7),it can subsequently emit green *** water-induced reversible emission switching is successfully used for optical security and information *** findings expand the under-standing of how the local coordination structure influences the photophysical mechanism in Sb^(3+)-doped metal halides and provide a novel method to control the STEs emission.

关键词： indium-based halides Sb^(3+)doping hydrogen bonding network optical anti-counterfeiting

Role of inflammatory lipid and fatty acid metabolic abnormalities induced by plastic additives exposure in childhood asthma

在线全文

学校读者我要写书评

暂无评论

Journal of Environm.ntal Sciences 2024年第3期137卷 172-180页

作者： Zhiyu Chen Fang Li Lei Fu Yu Xia Ying luo Ang Guo Xiaona Zhu Huifang Zhong Qian luo Institute of Biomedical and Health Engineering Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China University of Chinese Academy of Sciences Beijing 100049China Rheumatology&Imm.nology Departm.nt of Shenzhen Children’s Hospital Shenzhen 518038China Hubei Key Laboratory of Environm.ntal and Health Effects of Persistent Toxic Substances Institute of Environment and HealthJianghan UniversityWuhan 430056China

Lipid metabolism play an essential role in occurrence and developm.nt of asthma,and it can be disturbed by phthalate esters(PAEs)and organophosphate fame retardants(OPFRs).As a chronic infammatory respiratory disease,the occurrence risk of childhood asthma is increased by PAEs and OPFRs exposure,but it remains not entirely clear how PAEs and OPFRs contribute the onset and progress of the *** have profiled the serum levels of PAEs and OPFRs congeners by liquid chromatography coupled with mass spectrometry,and its relationships with the dysregulation of lipid metabolism in asthmatic,bronchitic(acute infammation)and healthy(non-infammation)*** PAEs and nine OPFRs congeners were found in the serum of children(1–5 years old)from Shenzhen,and their total median levels were 615.16 ng/m L and 17.06 ng/m L,***,the serum levels of m.no-methyl phthalate(mmP),tri-propyl phosphate(TPP)and tri-n-butyl phosphate(TnBP)were significant higher in asthmatic children than in healthy and bronchitic children as ***-one characteristic lipids and fatty acids of asthma were screened by machine-learning random forest model based on serum lipidome data,and the alterations of infammatory characteristic lipids and fatty acids including palmitic acids,12,13-Di HODE,14,21-Di HDHA,prostaglandin D2 and Lyso PA(18:2)showed significant correlated with high serum levels of mmP,TPP and *** results imply PAEs and OPFRs promote the occurrence of childhood asthma via disrupting infammatory lipid and fatty acid metabolism,and provide a novel sight for better understanding the effects of plastic additives on childhood asthma.

关键词： Phthalate esters Organophosphate fame retardants Childhood asthma Lipid and fatty acid metabolism machine-learning random forest model Chronic airway infammation

Pseudom.nas aeruginosa regulator PvrA binds simultaneously to multiple pseudo-palindromic sites for efficient transcription activation

在线全文

学校读者我要写书评

暂无评论

Science China(Life Sciences) 2024年第5期67卷 900-912页

作者： Yibo Zhu Bingnan luo Xingyu mou Yingjie Song Yonghong Zhou Yongbo luo Bo Sun Youfu luo Hong Tang Zhaom.ng Su Rui Bao Center of Infectious Diseases Division of Infectious Diseases in State Key Laboratory of BiotherapyWest China HospitalSichuan UniversityChengdu 610041China Departm.nt of Geriatrics and national Clinical Research Center for Geriatrics West China HospitalSichuan UniversityChengdu 610041China Key Laboratory of Biodiversity and Environm.nt on the Qinghai-Tibetan Plateau Ministry of EducationSchool of Ecology and EnvironmentTibet UniversityLhasa 850000China Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201210China College of Life Science Sichuan Normal UniversityChengdu 610101China Accurate Biotechnology(Hunan)Co. LtdChangsha 410006China

Tetracycline repressor(TetR)family regulators(TFRs)are the largest group of DnA-binding transcription factors and are widely distributed in bacteria and *** play vital roles in controlling the expression of various genes and regulating diverse physiological ***,a TFR protein Pseudom.nas virulence regulator A(PvrA),was identified from Pseudom.nas aeruginosa as the transcriptional activator of genes involved in fatty acid utilization and bacterial ***,we show that PvrA can simultaneously bind to multiple pseudo-palindromic sites and upregulate the expression levels of target ***-electron microscopy(cryo-Em)analysis indicates the simultaneous DnA recognition mechanism of PvrA and suggests that the bound DnA fragm.nts consist of a distorted B-DnA double *** crystal structure and functional analysis of PvrA reveal a hinge region that secures the correct domain motion for recognition of the promiscuous ***,our results showed that mutations disrupting the regulatory hinge region have differential effects on biofilm formation and pyocyanin biosynthesis,resulting in attenuated bacterial ***,these findings will improve the understanding of the relationship between the structure and function of the TetR family and provide new insights into the mechanism of regulation of *** virulence.

关键词： Pseudom.nas aeruginosa transcription regulator TetR protein-structure virulence

IR-YOLO: Real-Time Infrared Vehicle and Pedestrian Detection

在线全文

学校读者我要写书评

暂无评论

Computers, materials & Continua 2024年第2期78卷 2667-2687页

作者： Xiao luo Hao Zhu Zhenli Zhang Departm.nt of Electrical Engineering and Automation Jiangxi University of Science and TechnologyGanzhou341000China Jiangxi Provincial Key Laboratory of maglev Technology Ganzhou341000China Graduate School of Information Production and SystemsWaseda UniversityKitakyushu-shiFukuoka808-0135Japan

Road traffic safety can decrease when drivers drive in a low-visibility *** application of visual perception technology to detect vehicles and pedestrians in infrared images proves to be an effective means of reducing the risk of *** tackle the challenges posed by the low recognition accuracy and the substan-tial computational burden associated with current infrared pedestrian-vehicle detection methods,an infrared pedestrian-vehicle detection method A proposal is presented,based on an enhanced version of You Only Look Once version 5(YOLOv5).First,A head specifically designed for detecting small targets has been integrated into the model to make full use of shallow feature information to enhance the accuracy in detecting small ***,the Focal Generalized Intersection over Union(GIoU)is employed as an alternative to the original loss function to address issues related to target overlap and category ***,the distribution shift convolution optimization feature extraction operator is used to alleviate the computational burden of the model without significantly compromising detection *** test results of the improved algorithm show that its average accuracy(mAP)reaches 90.1%.Specifically,the Giga Floating Point Operations Per second(GFLOPs)of the improved algorithm is only *** contrast,the improved algorithms outperformed the other algorithms on similar GFLOPs,such as YOLOv6n(11.9),YOLOv8n(8.7),YOLOv7t(13.2)and YOLOv5s(16.0).The mAPs that are 4.4%,3%,3.5%,and 1.7%greater than those of these algorithms show that the improved algorithm achieves higher accuracy in target detection tasks under similar computational resource *** the other hand,compared with other algorithms such as YOLOv8l(91.1%),YOLOv6l(89.5%),YOLOv7(90.8%),and YOLOv3(90.1%),the improved algorithm.needs only 5.5%,2.3%,8.6%,and 2.3%,respectively,of the *** improved algorithm has shown significant advancem.nts in balancing accuracy and computati

关键词： Traffic safety infrared image pedestrians and vehicles focal GIoU distributed shift convolution