检索结果-南通市图书馆

Magneto‑Dielectric synergy and Multiscale Hierarchical structure Design Enable f.exible Multipurpose Microwave Absorption and Inf.ared stealth Compatibility

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2025年第2期17卷 401-416页

作者： Chen Li Leilei Liang Baoshan Zhang Yi Yang Guangbin ji school of.Electronic science and Engineering Nanjing UniversityNanjing 210093People’s Republic of China College of.Materials science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 210016People’s Republic of China

Developing advanced stealth devices to cope with radar-inf.ared(IR)f.sion detection and diverse application scenarios is increasingly demanded,which f.ces signif.cant challenges due to conf.icting microwave and IR cloaking mechanisms and f.nctional integration ***,we propose a multiscale hierarchical structure design,integrating wrinkled MXene IR shielding layer and f.exible f._(3)O_(4)@C/PDMs microwave absorption *** top wrinkled MXene layer induces the intensive dif.use ref.ection ef.ect,shielding IR radiation signals while allowing microwave to pass ***,the permeable microwaves are assimilated into the bottom f._(3)O_(4)@C/PDMs layer via strong magneto-electric *** theoretical and experimental optimization,the assembled stealth devices realize a near-perf.ct stealth capability in both X-band(8–12 GHz)and long-wave inf.ared(8–14μm)wavelength ***,it delivers a radar cross-section reduction of.20 dB m^(2),a large apparent temperature modulation range(ΔT=70℃),and a low average IR emissivity of.***,the optimal device demonstrates exceptional curved surf.ce conf.rmability,self.cleaning capability(contact angle≈129°),and abrasion resistance(recovery time≈5 s).This design strategy promotes the development of.multispectral stealth technology and reinf.rces its applicability and durability in complex and hostile environments.

关键词： Microwave absorption Radar-inf.ared compatible stealth Wrinkled MXene Magneto-dielectric synergy Multif.nction

f.nite element simulation of.elastoplastic f.eldnear crack tips and results f.r a central crackedplate of.le-lhp material under tension

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica sinica 2019年第4期35卷 828-838页

作者： X. ji f. Zhu school of.Aerospace Engineering and Applied Mechanics Tongji University Shanghai 200092 China

The elastoplastic f.eld near crack tips is investigated through f.nite element simulation.A ref.ned mesh model near the crack tip is proposed. In the mesh ref.ning area, element size continuously varies f.om the nanometer scale to themicrometer scale and the millimeter scale. Graphics of.the plastic zone, the crack tip blunting, and the def.rmed crack tip elements are given in the *** on the curves of.stress and plastic strain, closely near the crack tip, the stresssingularity index and the stress intensity f.ctor,as well as the plastic strain singularity index and the plastic strain intensity f.ctor are *** and plastic strainsingular index vary with the load, while the dimensions of.the stress and the plastic strain intensity f.ctorsdependon the stress and the plastic strain singularity index, respectively. The singular f.eld near the elastoplastic crack tip is characterized by the stress singularity index and the stress intensity f.ctor, or alternativelythe plastic strain singularity index and the plastic strain *** the end of.the paper, f.llowing Irwin’s concept of.f.acture mechanics,σδKσδKcriterion andεδQεδQcriterion are ***, crack tip angle criterion is also presented.

关键词： Crack f.acture mechanics Elastoplasticity f.nite element method Geometry Nonlinearity

Perf.uoropentane-based oxygen-loaded nanodroplets reduce microglial activation through metabolic reprogramming

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

Neural Regeneration Research 2025年第4期20卷 1178-1191页

作者： Wanxian Luo Chuanhui Xu Linxi Li Yunxiang ji Yezhong Wang Yingjia Li Yongyi Ye Department of.Medicine Ultrasonics Nanfang HospitalSouthern Medical UniversityGuangzhouGuangdong ProvinceChina Institute of.Neuroscience Department of NeurosurgeryThe Second Affiliated Hospital of Guangzhou Medical UniversityGuangzhouGuangdong ProvinceChina

Microglia,the primary immune cells within the brain,have gained recognition as a promising therapeutic target f.r managing neurodegenerative diseases within the central nervous system,including Parkinson’s *** perf.uorocarbon droplets have been reported to not only possess a high oxygen-carrying capacity,but also exhibit remarkable anti-inf.ammatory ***,the role of.perf.uoropentane in microglia-mediated central inf.ammatory reactions remains poorly *** this study,we developed perf.uoropentane-based oxygen-loaded nanodroplets(Pf.-OLNDs)and f.und that pretreatment with these droplets suppressed the lipopolysaccharide-induced activation of.M1-type microglia in vitro and in vivo,and suppressed microglial activation in a mouse model of.Parkinson’s *** suppression led to a reduction in the inf.ammatory response,oxidative stress,and cell migration capacity in ***,the neurotoxic ef.ects were mitigated,which alleviated neuronal ***,ultrahigh-perf.rmance liquid chromatography–tandem mass spectrometry showed that the anti-inf.ammatory ef.ects of.Pf.-OLNDs mainly resulted f.om the modulation of.microglial metabolic *** f.rther showed that Pf.-OLNDs regulated microglial metabolic reprogramming through the AKT-mTOR-HIf.1α***,our f.ndings suggest that the novel Pf.-OLNDs constructed in this study alleviate microglia-mediated central inf.ammatory reactions through metabolic reprogramming.

关键词： metabolic reprogramming microglia microglial migration nanotherapy neurodegenerative diseases neuroinf.ammation oxygen-loaded nanodroplets Parkinson’s disease perf.uoropentane ultra-perf.rmance liquid chromatography–mass spectrometry

Merging bound states in the continuum in an open acoustic resonator

在线全文

学校读者我要写书评

暂无评论

science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 124-131页

作者： Lujun Huang Bin jia Artem s.Pilipchuk sibo Huang Chen shen Almas f.sadreev Yong Li Andrey E.Miroshnichenko school of.Physics and Electronic sciences East China Normal University Institute of.Acoustics Tongji University L.V.Kirensky Institute of.Physics Department of.Mechanical Engineering Rowan University school of.Engineering and Technology University of New South Wales at Canberra

Bound states in the continuum （BICs） are perf.ctly localized resonances despite embedding in the continuum ***,an isolated BIC is very sensitive to the structure ***,we report merging acoustic BICs in a single open resonator,robust against the structure *** f.nd that both symmetry-protected BIC and f.iedrich-Wintgen BIC are sustained in a single coupled waveguide-resonator *** varying the height and length of.the resonator,these two BICs move toward each other and merge into a single one at a critical *** to an individual BIC,the merged BIC is robust against f.brication error because its Q-f.ctor is proportional to ΔL-4,whereΔL embodies the structure *** essence of.this extraordinary phenomenon is perf.ctly explained by the two-and three-level approximations of.the ef.ective nonHermitian ***,we present direct experimental demonstrations of.the moving and merging of.BICs in a coupled 3D waveguide-resonator,which are evidenced by the vanishing of.the linewidth of.f.no resonance in the transmission *** results may f.nd exciting applications in designing high-quality acoustic sources,sensors and f.lters.

关键词： acoustic resonances bound state in the continuum high-Q resonances

Aligned Ion Conduction Pathway of.Polyrotaxane‑Based Electrolyte with Dispersed Hydrophobic Chains f.r solid‑state Lithium–Oxygen Batteries

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Nano-Micro Letters 2025年第2期17卷 169-186页

作者： Bitgaram Kim Myeong‑Chang sung Gwang‑Hee Lee Byoungjoon Hwang sojung seo ji‑Hun seo Dong‑Wan Kim Department of.Materials science and Engineering Korea University145 Anam‑RoSeongbuk‑GuSeoul 02841Republic of Korea school of.Civil Environmental and Architectural EngineeringKorea University145 Anam‑RoSeongbuk‑GuSeoul 02841Republic of Korea Materials science and Chemical Engineering Center Institute for Advanced Engineering(IAE)Yongin 17180Republic of Korea

A critical challenge hindering the practical application of.lithium–oxygen batteries(LOBs)is the inevitable problems associated with liquid electrolytes,such as evaporation and saf.ty *** study addresses these problems by proposing a modif.ed polyrotaxane(mPR)-based solid polymer electrolyte(sPE)design that simultaneously mitigates solvent-related problems and improves ***-sPE exhibits high ion conductivity(2.8×10^(−3)s cm^(−1)at 25℃)through aligned ion conduction pathways and provides electrode protection ability through hydrophobic chain *** this mPR-sPE into solid-state LOBs resulted in stable potentials over 300 *** situ Raman spectroscopy reveals the presence of.an LiO_(2)intermediate alongside Li_(2)O_(2)during oxygen *** situ X-ray dif.raction conf.rm the ability of.the sPE to hinder the permeation of.oxygen and moisture,as demonstrated by the air permeability *** present study suggests that maintaining a low residual solvent while achieving high ionic conductivity is crucial f.r restricting the sub-reactions of.solid-state LOBs.

关键词： solid polymer electrolyte Lithium-oxygen batteries Polyrotaxane ion conductivity Hydrophobic chain

Topsoil as Af.ected by Dung Deposition Under Resting Places of.Red Howler Monkey (Alouatta seniculus)

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2008年第6期18卷 691-698页

作者： s. POUVELLE f. f.ER J. f. PONGE Musum National d'Histoire Naturelle CNRS UMR 7179 4 avenue du Petit-Chateau

The short-term inf.uence of.dung deposition and the f.rther redistribution of.dung by dung beetles were studied under a resting place of.the red howler monkey （Alouatta seniculus） living in tropical ralnf.rests of.south America. Monkey dung was experimentally clumped on the f.eld in a place used by troops of.howler monkeys f.r resting in the Nouragues Reserve station, f.ench Guiana. Dung-treated plots were sampled serially over three weeks and compared with controls located in their immediate vicinity. The composition of.the soil matrix （top 10 cm） was studied in successive microlayers using an optical method. Under the inf.uence of.dung beetle activity, the topsoil became more homogeneous by losing its litter, its content in earthworm f.eces increased in the course of.time, and surf.ce mineral deposits were penetrated by roots. The results were interpreted in the light of.present knowledge on the ef.ects of.soil animal activity on plant growth and survival of.seedlings.

关键词： dung beetle activity earthworm f.eces roots tropical ralnf.rests

soil Properties in Conif.rous f.rest stands Along a f.y Ash Deposition Gradient in Eastern Germany

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2005年第6期15卷 681-694页

作者： s. KLOsE f. MAKEsCHIN Institute of.soil science Faculty of Forest Geo and Hydro Sciences Dresden University of Technology P.O. 1117 D-01735 Tharandt (Germany)

Physical, chemical, and microbial properties of.f.rest soils subjected to long-term f.y ash depositions were analyzed in spruce (Picea abies (L.) Karst.) stands of.eastern Germany on three f.rest sites along an emission gradient of.3 (high input), 6, and 15 km (low input) downwind of.a coal-f.red power plant. Past emissions resulted in an atypical high mass of.mineral f.y ash constituents in the organic horizons at the high input site of.128 t ha-1 compared to 58 t ha-1 at the low input site. Magnetic susceptibility measurements proved that the high mineral content of.the f.rest f.oor was a result of.f.y ash accumulation in these f.rest stands. f.y ash deposition in the organic horizons at site I versus III signif.cantly increased the pH values, ef.ective cation exchange capacity, base saturation and, with exception of.the L horizon, concentrations of.mobile heavy metals Cd, Cr, and Ni, while stocks of.organic C generally decreased. A principal component analysis showed that organic C content and base status mainly controlled soil microbial biomass and microbial respiration rates at these sites, while pH and mobile f.actions of.Cd, Cr, and Ni governed enzyme activities. Additionally, it was hypothesized that long-term f.y ash emissions would eventually destabilize f.rest ecosystems. Theref.re, the results of.this study could become a usef.l tool f.r risk assessment in f.rest ecosystems that were subjected to past emissions f.om coal-f.red power plants.

关键词： conif.rous f.rests f.y ash deposition magnetic susceptibility microbial biomass mobile heavy metal f.action

Repetitive transcranial magnetic stimulation in Alzheimer’s disease:ef.ects on neural and synaptic rehabilitation

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第2期20卷 326-342页

作者： Yi ji Chaoyi Yang Xuerui Pang Yibing Yan Yue Wu Zhi Geng Wenjie Hu Panpan Hu Xingqi Wu Kai Wang Department of.Neurology The First Affiliated Hospital of Anhui Medical UniversityHefeiAnhui ProvinceChina Anhui Province Key Laboratory of.Cognition and Neuropsychiatric Disorders HefeiAnhui ProvinceChina Collaborative Innovation Center of.Neuropsychiatric Disorders and Mental Health HefeiAnhui ProvinceChina Institute of.Artif.cial Intelligence Hefei Comprehensive National Science CenterHefeiAnhui ProvinceChina Department of.Psychology and sleep Medicine The Second Affiliated Hospital of Anhui Medical UniversityHefeiAnhui ProvinceChina

Alzheimer’s disease is a neurodegenerative disease resulting f.om def.cits in synaptic transmission and *** Alzheimer’s disease brain tends to be hyperexcitable and hypersynchronized,thereby causing neurodegeneration and ultimately disrupting the operational abilities in daily lif.,leaving patients *** transcranial magnetic stimulation is a cost-ef.ective,neuro-modulatory technique used f.r multiple neurological *** the past two decades,it has been widely used to predict cognitive decline;identif. pathophysiological markers;promote neuroplasticity;and assess brain excitability,plasticity,and *** has also been applied to patients with dementia,because it can yield f.cilitatory ef.ects on cognition and promote brain recovery af.er a neurological ***,its therapeutic ef.ectiveness at the molecular and synaptic levels has not been elucidated because of.a limited number of.*** study aimed to characterize the neurobiological changes f.llowing repetitive transcranial magnetic stimulation treatment,evaluate its ef.ects on synaptic plasticity,and identif. the associated *** review essentially f.cuses on changes in the pathology,amyloidogenesis,and clearance pathways,given that amyloid deposition is a major hypothesis in the pathogenesis of.Alzheimer’s *** mechanisms associated with repetitive transcranial magnetic stimulation procedures and dif.erent pathways mediating gene transcription,which are closely related to the neural regeneration process,are also ***,we discuss the outcomes of.animal studies in which neuroplasticity is modulated and assessed at the structural and f.nctional levels by using repetitive transcranial magnetic stimulation,with the aim to highlight f.ture directions f.r better clinical translations.

关键词： Alzheimer’s disease amyloid deposition apoptotic mechanisms biomarker neural regeneration neurodegeneration repetitive transcranial magnetic stimulation synaptic plasticity

High‑Entropy Electrode Materials:synthesis,Properties and Outlook

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2025年第1期17卷 472-506页

作者： Dongxiao Li Chang Liu shusheng Tao jieming Cai Biao Zhong jie Li Wentao Deng Hongshuai Hou Guoqiang Zou Xiaobo ji College of.Chemistry and Chemical Engineering Central South UniversityChangsha 410083People’s Republic of China school of.Chemistry and Chemical Engineering Hunan Institute of EngineeringXiangtan 411104People’s Republic of China

High-entropy materials represent a new category of.high-perf.rmance materials,f.rst proposed in 2004 and extensively investigated by researchers over the past two *** def.nition of.high-entropy materials has continuously *** the last ten years,the discovery of.an increasing number of.high-entropy materials has led to signif.cant advancements in their utilization in energy storage,electrocatalysis,and related domains,accompanied by a rise in techniques f.r f.bricating high-entropy electrode ***,the research emphasis has shif.ed f.om solely improving the perf.rmance of.high-entropy materials toward exploring their reaction mechanisms and adopting cleaner preparation ***,the current def.nition of.high-entropy materials remains relatively vague,and the preparation method of.high-entropy materials is based on the preparation method of.single metal/low-or medium-entropy *** should be noted that not all methods applicable to single metal/low-or medium-entropy materials can be directly applied to high-entropy *** this review,the def.nition and development of.high-entropy materials are brief.y ***,the classif.cation of.high-entropy electrode materials is presented,f.llowed by a discussion of.their applications in energy storage and catalysis f.om the perspective of.synthesis ***,an evaluation of.the advantages and disadvantages of.various synthesis methods in the production process of.dif.erent high-entropy materials is provided,along with a proposal f.r potential f.ture development directions f.r high-entropy materials.

关键词： High-entropy Energy storage Electrode materials