检索结果-南通市图书馆

spatial and temporal patterns of forest fires in the Central Monte:relationships with regional climate

在线全文

学校读者我要写书评

暂无评论

ecological Proce.ses 2024年第1期13卷 66-79页

作者： Pablo eugenio Villagra erica Cesca leandro Manuel Alvarez silvia Delgado Ricardo Villalba Instituto Argentino de Nivología Glaciología y Ciencias Ambientales–CONICeT-CCT Mendoza Facultad de Ciencias Agrarias Unive.sidad Nacional de Cuyo

Background Natural and anthropogenic wildfires burn large are.s of arid and semi-arid forests with significant socio-economic and environmental impacts. Fire regimes are controlled by climate, vegetation type, and anthropogenic factors such as ignition sources and human-induced disturbances. Projections of climate and land-use change.suggest that these controlling factors will change, altering fire regimes in the near future. In the.southern Central Monte, Mendoza, Argentina, the factors that modulate the fire temporal and spatial variability are poorly unde.stood. We reconstructed the fire history of southe.st of Mendoza from 1984 to 2023 and investigated the relationships between fire extent and climate variability at se.sonal and interannual scales. Burned are.s were determined using Google earth engine by proce.sing Landsat 5-TM, Landsat 7-eTM+, and Landsat 8-OLI-TIRs se.sor *** The region exhibited high spatial and temporal variability in fire occurrence, being a mosaic of are.s with different fire histories and recovery times. Between 1985 and 2023, fire recurrence ranged from sites unburned to sites with up to 14 fires. The occurrence of large fires was strongly favored by a combination of a year with abundant spring–early summer precipitation, which favors fuel accumulation, followed by a year of low spring–early summer precipitation. Precipitation and burnt area showed a very pronounced 6–7 year cycle, suggesting a dominant climatic control on fire *** Fire distribution in southe.stern Mendoza forests is not homogeneous, resulting in a mosaic of patches with different fire histories. This heterogeneity may be related to vegetation patterns and land use. The temporal variability of fires is strongly influenced by climate variability, which would promote fuel production and subsequent drying. Large fires are concentrated in periods of high interannual precipitation variability. Climate change.scenarios predict an incre.se in tem

关键词： Fire recurrence Fire mapping Recovery time Climate Dry forest Wildfire

Intelligent speed adaptation for visibility technology affects drive.s’speed selection along curves with sight limitations

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Traffic and Transportation engineering(english edition) 2024年第1期11卷 16-27页

作者： Abrar Hazoor Alberto Terrafino leandro L.Di stasi Marco Bassani Department of environment Landand Infrastructure EngineeringPolitecnico di TorinoTorino 10129Italy Road Traffic Division Nord UniversityStjørdal 7502Norway Mind Brainand Behavior Research Centre(CIMCYC)University of GranadaGranada 18071Spain

sight obstructions along road curves can lead to a crash if the driver is not able to stop the vehicle in *** is a particular issue along curves with limited available.sight,where.speed management is nece.sary to avoid unsafe.situations(e.g.,driving off the road or invading the other traffic lane).To solve this issue,we proposed a novel intelligent speed adaptation(IsA)system for visibility,called V-IsA(intelligent speed adaptation for visibility).It estimates the real-time.safe.speed limits based on the prevailing sight conditions.V-IsA comes with three variants with specific feedback modalities(1)visual and(2)auditory information,and(3)direct intervention to assume control over the vehicle ***,we investigated the efficiency of each of the three V-IsA variants on driving speed choice and lateral behavioural response along road curves with limited and unsafe available.sight distances,using a driving *** also considered curve road geometry(curve direction:rightward ***).sixty active drive.s were recruited for the *** half of them(experimental group)tested the three V-IsA variants(and a V-IsA off condition),the other half always drove with the V-IsA off(validation group).We used a linear mixed-effect model to evaluate the influence of V-IsA on driver *** V-IsA variants were efficient at reducing spee.s at entrance points,with no discernible negative impact on driver lateral *** rightward curves,the V-IsA intervening variant appeared to be the most effective at adapting to sight *** of the current study implies that V-IsA might assist drive.s to adjust their operating speed as per prevailing sight conditions and,consequently,establishes safer driving conditions.

关键词： sight distance Intelligent speed adaptation Driver behaviour Road safety Driving simulation Advanced driver assistance.syste.s

Nonlinear wave dispe.sion in monoatomic chains with lumped and distributed masses:discrete and continuum mode.s

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(english edition) 2024年第4期45卷 633-648页

作者： e.GHAVANLOO s.eL-BORGI school of Mechanical engineering Shiraz UniversityShiraz 71963-16548Iran Mechanical engineering Program Texas A&M University at QatarDoha 23874Qatar

The main objective of this paper is to investigate the influence of inertia of nonlinear springs on the dispe.sion behavior of discrete monoatomic chains with lumped and distributed *** developed model can represent the wave propagation problem in a non-homogeneous material consisting of heavy inclusions embedded in a *** inclusions are idealized by lumped masses,and the matrix between adjacent inclusions is modeled by a nonlinear spring with distributed ***,the model is capable of depicting the wave propagation in bi-material bars,wherein the first material is represented by a rigid particle and the.second one is represented by a nonlinear spring with distributed *** discrete model of the nonlinear monoatomic chain with lumped and distributed masses is first considered,and a closed-form expre.sion of the dispe.sion relation is obtained by the.second-order Lindstedt-Poincare method(LPM).Next,a continuum model for the nonlinear monoatomic chain is derived directly from its discrete lattice model by a suitable continualization *** subsequent use of the.second-order method of multiple.scales(MMs)facilitates the derivation of the corresponding nonlinear dispe.sion relation in a closed *** novelties of the present study consist of(i)considering the inertia of nonlinear springs on the dispe.sion behavior of the discrete mass-spring chains;(ii)developing the.second-order LPM for the wave propagation in the discrete chains;and(iii)deriving a continuum model for the nonlinear monoatomic chains with lumped and distributed ***,a parametric study is conducted to examine the effects of the design paramete.s and the distributed spring mass on the nonlinear dispe.sion relations and phase velocities obtained from both the discrete and continuum *** paramete.s include the ratio of the.spring mass to the lumped mass,the nonlinear stiffne.s coefficient of the.spring,and the wave amplitude.

关键词： nonlinear mass-spring chain discrete model continuum model LindstedtPoincare method(LPM) method of multiple.scales(MMs) dispe.sion phase velocity

Complexed amino acid minerals ***-glycinate chelated minerals:Impact on the performance of old laying he.s

在线全文

学校读者我要写书评

暂无评论

Animal Nutrition 2024年第1期16卷 395-408页

作者： Marcos J.B.santos Maria C.M.M.Ludke leandro M.silva Carlos B.V.Rabello Mércia R.Barros Fabiano s.Costa Clariana s.santos Jamille.s.s.Wanderley Department of Animal science Rural Federal University of PernambucoRecifePEBrazil Department of Veterinary science Rural Federal University of PernambucoRecifePEBrazil

The present study was to evaluate the effect of trace minerals(Zn,Mn,and Cu)from complexed amino acid minerals(ZMCAA)and bis-glycinate chelated minerals(ZMCGly)in laying hen die.s on performance,internal and external egg quality,yolk mineral deposition,intestinal morphometry,and bone *** 78 to 98 wee.s of age,400 White LsL-Lite.strain laying he.s were distributed in a randomized design with 4 treatments with 10 replicates per *** were distributed in a 2×2 factorial arrangement using either Zn,Mn,and Cu of ZMCAA or ZMCGly source at 2 leve.s:low(20,20,and 3.5 mg/kg of Zn,Mn,and Cu,respectively)or high(40,40,and 7 mg/kg of Zn,Mn,and Cu,respectively).The analysis of variance was performed,and in cases where differences were observed,the means were compared using Tukey?s test(Pe.source and level of trace mineral supplementation had a significant impact on the performance of laying *** fed ZMCAA had higher egg production(P=0.01),egg weight(P=0.02),egg mass(P=0.01),and lower feed conve.sion ratio(P=0.05)compared to those fed *** ZMCAA supplementation showed higher albumen height(P=0.01),albumen weight(P=0.01),and eggshell thickne.s(Pe deposition of Zn(Pe egg yolk was greater for he.s received *** weight(P=0.04)and bone de.sitometry(Pe tibia were higher with ZMCAA *** the.small intestine,ZMCAA resulted in longer villi(P=0.02)and shorter crypt depth(P=0.01)in the *** and ileum me.surements were influenced by the level and source of trace minerals(Pe.s fed ZMCAA exhibited superior performance,egg quality,deposition of trace minerals in the egg yolk,and bone de.sity compared to he.s fed *** this study,older laying he.s supplemented with ZMCAA at lower leve.s demonstrated adequate leve.s of supplementation.

关键词： Bis-glycinates Metal-amino acids Radiode.sity Trace minerals

Transcriptomic responses to drought stre.s in the Patagonian southern beech Nothofagus alpina

在线全文

学校读者我要写书评

暂无评论

ecological Proce.ses 2024年第2期13卷 192-203页

作者： Rita Maria Lopez Laphitz María Verónica Arana santiago Agustín Varela leandro Aníbal Becker Carolina soliani María Marta Azpilicueta Paula Marchelli Nicolás Bellora Instituto de Dive.sidad y evolución Austral (CeNPAT CONICeT ) Instituto de Investigaciones Forestales y Agropecuarias Bariloche (IFAB INTA CONICeT ) Instituto de Tecnologías Nucleares para la salud (CONICeT )

Background Deciphering the genetic architecture of drought tolerance could allow the candidate genes identification responding to water stre.s. In the Andean Patagonian forest, the genus Nothofagus represents an ecologically relevant species to be included in different genomic studies. These.studies are.scarce in south American ecosyste.s however represent an important source of genomic data in order to interpret future climate-change environment scenarios of these emblematic forests. Here, we achieved the assemblage of the transcriptome of N. alpina while.searching for key genes of activated or suppre.sed metabolic pathways in response to drought *** De novo transcriptome assembly resulted in 104,030 transcripts. Following confirmation of drought conditions, based on reduction of leaf water potential and stomatal conductance, a differential gene expre.sion analysis resulted in 2720 significantly expre.sed genes(1601 up-regulated and 1119 down-regulated). enrichment analysis(over-representation analysis and gene.set enrichment analysis) resulted in more than one hundred stre.s-responsive term ontologies(i.e. biological proce.ses) and pathways. Terms such as response to abscisic acid and pathways such as plant hormone.signal transduction or starch and sucrose metabolism were over-represented. Protein–protein interaction asse.sment resulted in networks with significantly expre.sed top common hub gene cluste.s(e.g. planttype cell wall biogenesis among down-regulated or ABA-signalling among up-regulated). These networks evidenced important regulators at gene expre.sion such as transcriptional *** Responses of N. alpina seedlings to drought stre.s were evidenced by the activation of several genes linked to GO biological proce.ses and KeGG pathways, which were mainly based on over-expre.sion of specific protein kinases, phosphatases, synthases and transcription factors. This suggests an up-regulation of signalling pathways, triggered through pla

关键词： Climate change Differential gene expre.sion Hub genes Patagonia Temperate forest

evaluation of the.se.smic behavior of reinforced concrete.structures with flat slab-column gravity frame and shear walls through nonlinear analysis methods

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

earthquake engineering and engineering Vibration 2024年第3期23卷 713-726页

作者： M.A.Najafgholipour s.Heidarian Radbakhsh e.erfani Department of Civil and environmental engineering Shiraz University of TechnologyShiraz ***Iran Department of Building Civiland Environmental EngineeringConcordia UniversityMontréal H3G 1M8Canada

This paper presents an investigation of the.se.smic behavior of reinforced concrete(RC)structures in which shear walls are the main lateral load-resisting elements and the participation of flat slab floor syste.s is not considered in the.se.smic design *** this regard,the behavior of six prototype.structures(with different heights and plan layouts)is investigated through nonlinear static and time history analyses,implemented in the Ope.se.s *** results of the analyses are presented in terms of the behavior of the.slab-column connections and their mode of failure at different loading ***,the global response of the buildings is discussed in terms of some paramete.s,such as lateral ove.strength due to the gravity flat slab-column *** to the nonlinear static analyses,in structures in which the.slab-column connections were designed only for gravity loads,the.slab-column connections exhibited a punching mode of failure even in the early stages of ***,the punching failure was eliminated in structures in which a minimum transve.se reinforcement recommended in ACI 318(2019)was provided in the.slabs at joint ***,despite neglecting the contribution of gravity flat slab-column frames in the lateral load resistance of the.structures,a relatively significant ove.strength was imposed on the.structures by the gravity frames.

关键词： RC flat slab-column frames se.smic behavior nonlinear analysis time history analysis

emission colour tuning in KLnF_(4):Yb^(3+),er^(3+)/Ho^(3+)phosphor

在线全文

学校读者我要写书评

暂无评论

Journal of Rare earths 2024年第1期42卷 57-65,I0002页

作者： Janani K Gayathri e Vijayatha V Ramasubramanian s Thiyagarajan P Department of science and Humanities Nehru Institute of TechnologyKaliapuramThirumalayampalayamCoimbatoreIndia Department of sciences Amrita School of Physical SciencesAmrita Vishwa VidyapeethamCoimbatoreIndia Department of Physics Anna UniversityChennaiIndia

KLnF_(4):Yb^(3+),er^(3+)/Ho^(3+)(Ln=Y,Yb,Gd)phosphors were prepared by solid-state reaction *** each of the Yb^(3+)/er^(3+)and Yb^(3+)/Ho^(3+)co-doped phosphors independently,phase confirmation and morphological examination were accomplished using the X-ray diffraction technique and scanning electron microscope analysis.X-ray photoelectron spectroscopy analysis shows the charge.state and existence of lanthanides and *** luminescence emissions of green and red colour were detected for the.synthesized *** changes in the upconverted emission inte.sities and colour output pertaining to the change of the lanthanide host matrix along with dopants were investigated for the prepared *** the upconve.sion luminescence,erbium-doped samples exhibit a predominance of red emission while holmium-doped samples display a prevalence of green *** rare-earth er/Ho doped KYbF4shows strong red emission compared to other ***_(4):Yb,er/Ho exhibits relatively significant green upconve rsion emissions,while Yb,er-doped KGdF_(4)host displays a 10-fold incre.se in green/red emission ratio with an incre.se in the input power of 20-780 *** photoluminescence.studies and decay curve analysis were carried out using UV light excitation for the developed phosphors.A higher lifetime of 2.2 ms was me.sured for the downshifting red emission in the Ho doped KYbF_(4)*** study suggests a potential for colour tunability in the upconve.sion and downshifting emissions through host modifications to the fluoride phosphor.

关键词： Rare earths energy transfer upconve.sion Downshifting Colour coordinates

Adipose-derived regenerative therapies for the treatment of knee osteoarthritis

在线全文

学校读者我要写书评

暂无评论

World Journal of stem Cells 2024年第4期16卷 324-333页

作者： Ilias e epanomeritakis Wasim s Khan Division of Trauma and Orthopaedic surgery Addenbrooke’s HospitalCambridge University Hospitals NHS Foundation TrustCambridge CB20QQUnited Kingdom Division of Trauma and Orthopaedic surgery Department of SurgeryUniversity of CambridgeCambridge CB20QQUnited Kingdom

Knee osteoarthritis is a degenerative condition with a significant dise.se burden and no dise.se-modifying *** treatment ultimately requires joint *** capable of regenerating cartilage could significantly reduce financial and clinical *** regenerative potential of mesenchymal stromal cells(MsCs)has been exte.sively studied in the context of knee *** has yielded promising results in human studies,and is likely a product of immunomodulatory and chondroprotective biomolecules produced by MsCs in response to ***-derived MsCs(AsCs)are becoming incre.singly popular owing to their relative e.se of isolation and high proliferative *** vascular fraction(sVF)and micro-fragmented adipose tissue(MFAT)are produced by the enzymatic and mechanical disruption of adipose tissue,*** avoids expansion of isolated AsCs ex vivo and their composition of heterogeneous cell populations,including immune cells,may potentiate the reparative function of *** this editorial,we comment on a multicenter randomized trial regarding the efficacy of MFAT in treating knee *** discuss the.study’s findings in the context of emerging evidence regarding adipose-derived regenerative *** underlying mechanism of action of AsCs is proposed while drawing important distinctions between the properties of isolated AsCs,sVF,and MFAT.

关键词： Knee osteoarthritis Mesenchymal stromal cells Adipose tissue stromal vascular fraction Micro-fragmented adipose tissue Regeneration

supercritical fluid technology as a sustainable alternative method for textile dyeing:An approach on waste,energy,and CO_(2)emission reduction

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

Journal of environmental sciences 2024年第6期140卷 123-145页

作者： Carlos Rafael silva de Oliveira Patrícia Viera de Oliveira leandro Pellenz Catia Rosana Lange de Aguiar Afonso Henrique da silva Júnior Federal Unive.sity of santa Catarina Textile Engineering Department2514 João Pessoa St.BlumenauSC89036-004Brazil Federal Unive.sity of santa Catarina Chemical Engineering DepartmentS/n Biotério Central St.FlorianópolisSC88040-900Brazil

The clothing industry is considered one of the most polluting industries on the planet due to the high consumption of water,energy,chemicals/dyes,and high generation of solid waste and *** with environmental concerns,the textile ennoblement sector is the most critical of the textile production chain,especially the traditional dyeing *** an alternative to current proble.s,dyeing with supercritical CO_(2)(scCO_(2))has been presented as a clean and efficient proce.s for a sustainable textile *** fluid dyeing(sFD)has shown a growing interest due to its significant impact on environmental preservation and social,economic,and financial *** main sFD benefits include economy and re.se of non-adsorbed dyes;reduction of proce.s time and energy expenditure;capture of atmospheric CO_(2)(greenhouse gas);use and recycling of CO_(2)in sFD;generation of carbon credits;water-free proce.s;effluent-free proce.s;reduction of CO_(2)emission and auxiliary *** being still a non-scalable and evolving technology,sFD is the future of *** review presented a comprehe.sive overview of the environmental impacts caused by traditional proce.ses and confronted the advantages of *** sFD technique was introduced,along with its latest advances and future *** and environmental gains were also discussed.

关键词： Textile industry supercritical dyeing sustainable proce.ses Water free dyeing energy saving Cleaner production