检索结果-南通市图书馆

Retention and redistribution of biological legacies generate resource sinks in silvopastoral systems of Arid Chaco forests

在线全文

学校读者我要写书评

暂无评论

Ecological Processes 2019年第1期8卷 344-359页

作者： laura Cavallero Marcela ledesma Dardo R.lópez Carlos A.Carranza Centro Científico Tecnológico(CCT)CONICET Córdoba CórdobaArgentina Estación Forestal INTA-Villa Dolores(EEA Manfredi) CórdobaArgentina

Background:Forests are used for multiple purposes worldwide,which often include timber harvest,firewood extraction and livestock *** excessive pressure on multipurpose systems may decrease soil cover,promoting soil erosion and causing the loss of other resources,as litter and *** forestry practices can help to decrease or mitigate resource loss in the managed ***,retaining and redistributing biological legacies(***,branches,woody debris)at strategic locations can create sediment,litter,and seed-sinks in the silvopastoral *** addition,grazing management could increase or,even,decrease the success of this *** this study,we assessed the effect of branch barriers and grazing management on resource run-off/runon processes in silvopastoral systems of Arid Chaco(Córdoba,Argentina).To do this,a 2-ha area was divided in two paddocks that were randomly assigned to different grazing managements:winter *** *** randomly selected 22 water run-off paths in each paddock,and in the half of them,we build elongated branch *** each run-off path(with and without branch barriers),we recorded the amount of accumulated and lost sediment(during the rainy season),litter biomass,germinable seed bank,richness and cover of plant species,and richness and density of seedlings and saplings of woody ***:Branch barriers promoted sediment accumulation during the first and the second year of the study,depending on grazing *** temporal and spatial scale of the effect of the branch barriers also depended on grazing *** barriers also trapped litter and seeds,which may have increased the richness and density of seedlings and saplings of woody ***:By intercepting the dominant flow of erosive agents,branch barriers trapped sediment,litter,and propagules of different species.A greater amount of sediment and litter would have improved microsite quality,favouring seed germination an

关键词： Branch barriers Ecosystem degradation Multipurpose forests Soil erosion Winter grazing

Interfacial Strategies for Smart Slippery Surfaces

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2020年第4期17卷 633-643页

作者： Glen McHale Rodrigo ledesma-Aguilar Gary George Wells Smart Materials&Surfaces laboratory Faculty of Engineering and EnvironmentNorthumbria UniversityNewcastle upon TyneNE18STUK

The problem of contact line pinning on surfaces is pervasive and contributes to problems from ring stains to ice *** we provide a single conceptual framework for interfacial strategies encompassing five strategies for modifying the solid-liquid interface to remove pinning and increase droplet *** biomimetic strategies are included,(i)reducing the liquid-solid interfacial area inspired by the lotus effect,(ii)converting the liquid-solid contact to a solid-solid contact by the formation of a liquid marble inspired by how galling aphids remove honeydew,and(iii)converting the liquid-solid interface to a liquid-lubricant contact by the use of a lubricant impregnated surface inspired by the Nepenthes Pitcher *** further strategies are,(iv)converting the liquid-solid contact to a liquid-vapor contact by using the leidenfrost effect,and(v)converting the contact to a liquid-liquid-like contact using slippery omniphobic covalent attachment of a liquid-like coating(SOCAl).Using these approaches,we explain how surfaces can be designed to have smart functionality whilst retaining the mobility of contact lines and ***,we show how droplets can evaporate at constant contact angle,be positioned using a Cheerios effect,transported by boundary reconfiguration in an energy invariant manner,and drive the rotation of solid components in a leidenfrost heat *** conceptual framework enables the rationale design of surfaces which are slippery to liquids and is relevant to a diverse range of applications.

关键词： superhydrophobicity SlIPS liquid marbles leidenfrost SOCAl

Beginning from the end:the presynaptic terminal as a pathomechanism hub in frontotemporal dementia and amyotrophic lateral sclerosis

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11期20卷 3217-3218页

作者： laura Huggon Emma l.Clayton UK Dementia Research Institute at King’s College london LondonUK Department of Basic and Clinical Neuroscience Institute of Psychiatry Psychology&NeuroscienceKing’s College LondonLondonUK

Frontotemporal dementia and amyotrophic lateral sclerosis:Frontotemporal dementia(F T D)and amyo t rophic lateral sclerosis(AlS)are neurodegenerative diseases with significant overlapping *** these neurodegenerative diseases affect different neuronal populations(with FTD affecting neurons of the frontal and temporal lobes,and AlS affecting upper and lower motor neurons),these two diseases are complexly *** and AlS exist on a disease spectrum,with shared genetic causes,clinical presentations,and pathologies.

关键词： diseases amyotrophic sclerosis

Single-cell system using monolithic PMUTs-on-CMos to monitor fluid hydrodynamic properties

在线全文

学校读者我要写书评

暂无评论

Microsystems & Nanoengineering 2022年第4期8卷 81-89页

作者： Eyglis ledesma lvan Zamora Jesus Yanez rantxa Uranga Nuria Barniol Department of Electronics Engineering Universitat Autonoma de Barcelona08193 BellaterraSpain

In this work,a single cell capable of monitoring fluid density,viscosity,sound velocity,and compressibility with a compact and small design is *** fluid measurement system is formed by a two-port AlScN piezoelectric micromachined ultrasonic transducer(PMUT)with an 80μm length monolithically fabricated with a 130 nm complementary metal-oxide semiconductor(CMOS)*** electrode configuration allows the entire system to be implemented in a single device,where one electrode is used as an input and the other as an *** verification was carried out by exploiting the features of piezoelectric devices such as resonators and acoustic transducers,where a frequency shift and amplitude variation are expected because of a change in density and viscosity.A sensitivity of 482±14 Hz/kg/m3 demonstrates the potential of the system compared to other dualelectrode *** addition,according to the acoustic measurement,the sound velocity,fluid compressibility,and viscosity coefficient can be extracted,which,to the best of our knowledge,is novel in these PMUT systems.

关键词： process. system electrode

Multiple sclerosis is at a checkpoint: advancing the program

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3期20卷 811-812页

作者： Brandon C.Smith Jessica l.Williams Department of Neurosciences Lerner Research InstituteCleveland ClinicClevelandOHUSA Department of Biological Geologicaland Environmental SciencesCleveland State UniversityClevelandOHUSA

Multiple sclerosis(MS) is a chronic inflammatory and demyelinating disease of the central nervous system(CNS). Patients with MS experience sensory and motor function loss due to myelin and/or axon damage perpetuated b... 详细信息

关键词： Hauser sclerosis damage

Generation of brain vascular heterogeneity:recent advances from the perspective of angiogenesis

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第7期20卷 2013-2014页

作者： Nathanael J.lee Ryota l.Matsuoka Department of Neurosciences Lerner Research InstituteCleveland ClinicClevelandOHUSA Department of Molecular Medicine Cleveland Clinic Lerner College of MedicineCase Western Reserve UniversityClevelandOHUSA

Heterogeneous proper t i es of vascular endothelial cells in the brain:The brain displays large energy dynamics and consumption,and this high level of metabolic demands is fulfilled by a continuous supply of glucose and oxygen through its vascular *** vasculature consists of highly divergent blood vessel branches,giving rise to a dense network of capillaries that supply blood to all cells across the *** elaborated vascular network is thought to develop via angiogenesis,a process in which new blood vessels grow from pre-existing *** capillaries exhibit organotypic features distinct from other tissues and are formed primarily by two major endothelial cell(EC)types:those that form the semi-permeable blood-brain barrier(BBB)and those that develop highly permeable pores known as fenestrae(Matsuoka et al.,2022).The structural and functional differences between BBB and fenestrated vascular ECs represent a fundamental feature of brain vasculature and form the foundation for both brain function and homeostasis.

关键词： angiogenesis homeostasis network

From flatness, GPI observers, GPI control and flat filters to observer-based ADRC

在线全文

学校读者我要写书评

暂无评论

Control Theory and Technology 2018年第4期16卷 249-260页

作者： Hebertt SIRA-ramirez CINVESTAV-IPN Department of Electrical Engineering Mechatronics Section Avenida IPN No. 2508 Col. San Pedro Zacatenco CP 07360 CDMX Mexico

In this article, we establish the route taken by the author, and his research group, to bring differential flatness to the realm of active disturbance rejection control （ADRC）. This avenue entitled： 1） generalized proportional integral observers （GPIO）, as natural state and disturbance observers for fiat systems, 2） generalized proportional integral （GPI） control, provided with extra integrations, to produce a modular controller known as flat filters （FF＇s） and, finally, 3） the establishing of an equivalence of observer based ADRC with FF＇s. The context is that of pure integration systems. The obtained controllers depend only on the order of the flat system and they are to be directly used on the basis of the available flat output signal in a universal, modular, fashion. The map is complemented with the relevant references where the intermediate techniques were illustrated and developed, over the years, in connection with laboratory experimental implementations.

关键词： Flatness GPI observers GPI control reduced order GPI observers fiat filters

Air Pollution, Government Pollution Regulation, and Industrial Production in China

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Systems Science & Complexity 2020年第4期33卷 1064-1079页

作者： CAO Dong ramirez Carlos D. School of Economics and Management Xidian UniversityXi’an 710071China Department of Economics George Mason UniversityFairfaxVAUnited States

Over the last four decades,a severe deterioration in air quality has accompanied China’s rapid *** a result,the Chinese government has implemented stricter policies and regulation to control air *** this paper,the authors create a measure of government policies on air pollution by tracking all pollution-related government announcements in Chinese *** authors then use this variable,along with measures of actual pollution,to investigate how air pollution,industrial production,and government policies on air pollution are *** authors conduct this investigation nationwide,as well as in five large cities in China.A vector autoregression model suggests that,nationwide,government policies seem to decrease air pollution without significantly affecting industrial ***,the effect appears to be short-lived,dissipating after a few *** addition,the authors find that the dynamic relationship among these variables differs by *** instance,following an adverse air quality shock in Beijing,government efforts to control pollution seem to have an ameliorating city-wide effect,decreasing local air pollution in subsequent *** Shanghai and Guangzhou,while the local government reacts to adverse air pollution shocks,the ameliorating effects are not statistically *** Chengdu and Shenyang,the authors detect no significant local government reaction to adverse air pollution ***,in these cities,local government policies do not impart a statistically measurable effect on air pollution.

关键词： pollution. pollution nationwide

Synthesis identification analysis for closed loop system

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2021年第4期32卷 939-946页

作者： WANG Jianhong RICARDO A.ramirez-Mendoza School of Electronic Engineering and Automation Jiangxi University of Science and TechnologyGanzhou 343100China School of Engineering and Sciences Tecnologico de MonterreyMonterrey 64849Mexico

The existing theories for closed loop identification with the linear feedback controller are very *** apply the existed theories directly in the control field,we propose a new idea about replacing the original unknown and nonlinear feedback controller with one approximated linear controller,while guaranteeing the equivalent property for the obtained closed loop *** on some statistical correlation functions,one condition is derived to show the equivalent property between the approximated linear controller and the original nonlinear *** detailed explicit form,corresponding to the approximated linear controller,is also ***,to give a complete analysis for closed loop identification,the cost function is rewritten as one extended expression,being convenient to *** spectral estimation is introduced to identify the unknown plant in the closed loop ***,the proposed theories are verified by one simulation example.

关键词： synthesis analysis closed loop system simplified function equivalent controller