检索结果-南通市图书馆

Determination of Soil Aggregate Porosity Using the Modified Water Saturation Method

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2019年第6期29卷 794-800页

作者： david MORET-fernández María Victoria LóPEZ Departamento de Suelo y Agua Estación Experimental de Aula Dei Consejo Superior de Investigaciones Científicas (EEAD-CSIC)

The need to find a simple method for measuring soil aggregate porosity (φ) is justified by the growing interest of researchers in this important parameter of soil physical status. The aim of this study was to present a simple method (AM) for estimating the total 0 of a single soil aggregate. In this case, soil aggregate 0 was calculated as the quotient between the pore volume, estimated from the weight of the aggregate saturated with ethanol, and the total volume (V T ) of aggregate, calculated from the particle density and dry aggregate weight. The V T estimated with AM was compared with the corresponding volume measured with the photogrammetry (PHM) technique using soil aggregates of 8–16 mm in diameter and collected from three different tillage systems: conventional tillage (CT), reduced tillage (RT), and no tillage (NT). Next, the AM was used to study the effects of the tillage system on soil aggregate φ. Although a strong relationship ( R 2 = 0.99, P < 0.000 1) between aggregate V T measured with PHM and that estimated with AM was obtained, AM tended to underestimate aggregate V T with an average deviation of 2.85%. This difference may be due to ethanol evaporation during the first 10 s before the ethanol-saturated aggregate was weighed. The use of AM to determine the effects of different tillage systems on aggregate φ showed that this method was sensitive to detect significant differences among the tillage treatments. The results showed that AM could be an accurate, simple, and inexpensive alternative to estimate φ of a single soil aggregate.

关键词： Aggregate stability Bulk density Particle density Photogrammetry technique Tillage system

Role of climatic variability in shaping intraspecific variation of thermal tolerance in Mediterranean water beetles

在线全文

学校读者我要写书评

暂无评论

Insect Science 2024年第1期31卷 285-298页

作者： Susana Pallarés david Garoffolo Belén Rodríguez david Sánchez-fernández Department of Zoology University of SevilleSevilleSpain Faculty of Biology Department of Ecology and HydrologyUniversity of MurciaCampus EspinardoMurciaSpain

The climatic variability hypothesis(CVH)predicts that organisms in more thermally variable environments have wider thermal breadths and higher thermal plasticity than those from more stable ***,due to evolutionary trade-offs,taxa with greater absolute thermal limits may have little plasticity of such limits(trade-off hypothesis).The CVH assumes that climatic variability is the ultimate driver of thermal tolerance variation across latitudinal and altitudinal gradients,but average temperature also varies along such *** explored intraspecific variation of thermal tolerance in three typical Mediterranean saline water beetles(families Hydrophilidae and Dytiscidae).For each species,we compared two populations where the species coexist,with similar annual mean temperature but contrasting thermal variability(continental *** population).We estimated thermal limits of adults from each population,previously acclimated at 17,20,or 25℃.We found species-specific patterns but overall,our results agree with the CVH regarding thermal ranges,which were wider in the continental(more variable)*** the two hydrophilid species,this came at the cost of losing plasticity of the upper thermal limit in this population,supporting the trade-off hypothesis,but not in the dytiscid *** results support the role of local adaptation to thermal variability and trade-offs between basal tolerance and physiological plasticity in shaping thermal tolerance in aquatic ectotherms,but also suggest that intraspecific variation of thermal tolerance does not fit a general pattern among aquatic *** such intraspecific variation could lead to inaccurate predictions of the vulnerability of aquatic insects to global warming.

关键词： acclimation capacity aquatic insects climate change heat coma temperature supercooling point thermal plasticity

The effect of slime accumulated in a long-term operating UASB using crude glycerol to treat S-rich wastewater

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1期135卷 353-366页

作者： Xudong Zhou Eva fernández-Palacios Antoni DDorado Javier Lafuente Xavier Gamisans david Gabriel Key Laboratory of Urban Pollutant Conversion Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China GENOCOV Research Group Department of ChemicalBiological and Environmental EngineeringEscola d’EnginyeriaUniversitat Autònoma de Barcelona08193 BellaterraSpain Department of Mining Industrial and ICT EngineeringUniversitat Politècnica de CatalunyaAvinguda de les Bases de Manresa 61-7308242 ManresaSpain

An up-flow anaerobic sludge blanket(UASB)reactor targeting sulfate reduction was operated under a constant TOC/S-SO2-4ratio of 1.5±0.3 g C/g S for 639 days using crude glycerol as carbon source.A filamentous and fluffy flocculant material,namely slime-like substances(SLS),was gradually accumulated in the bioreactor after the cease of methanogenic *** accumulation of SLS was followed by a decrease in the removal efficiencies and a deterioration in the *** characteristics of SLS were investigated to explore the causes of its formation and the effect of SLS on the UASB *** showed that glycerol fermentation and sulfate reduction processes taking place in the reactor were mainly accomplished in the bottom part of the UASB reactor,as the sludge concentration in the bottom was *** accumulation of SLS in the UASB reactor caused sludge flotation that further led to biomass washout,which decreased the sulfate and glycerol removal *** activity tests performed with granular sludge(GS),slime-covered granular sludge(SCGS)and SLS showed that there was no difference between GS and SLS in the mechanism of glycerol fermentation and sulfate ***,the specific sulfate reduction rate of GS was higher than that of SLS,while SLS showed a higher glycerol fermentation rate than that of *** different rates in GS and SLS were attributed to the higher relative abundances of fermentative microorganisms found in SLS and higher relative abundances of sulfate reducing bacteria(SRB)found in GS.

关键词： Sludge flotation Granular sludge Slime-like substances Glycerol fermentation Sulfate reduction Removal efficiency

Tribological performance of tributylmethylammonium bis(trifluoromethylsulfonyl)amide as neat lubricant and as an additive in a polar oil

在线全文

学校读者我要写书评

暂无评论

Friction 2019年第3期7卷 282-288页

作者： Rubén GONZáLEZ Diego RAMOS david BLANCO Alfonso fernández-GONZáLEZ Jose L.VIESCA Mark HADFIELD Antolin HERNández BATTEZ Department of Marine Science and Technology University of OviedoAsturias 33203Spain Department of Construction and Manufacturing Engineering University of OviedoAsturias 33203Spain Department of Physical and Analytical Chemistry University of OviedoAsturias 33006Spain Department of Design and Engineering Bournemouth UniversityPoole BH12 5BBUK

The ionic liquid(IL) tributylmethylammonium bis(trifluoromethylsulfonyl)amide([N4441][NTf2]) was used as neat lubricant and as an additive(1.5 wt%) in a polar oil to study its friction and wear reducing *** tests were completed for 90 minutes at room temperature and 100 °C in a reciprocating configuration at loads of 30 and 70 N,10 Hz-frequency,and 4 mm stroke *** volume was measured by confocal microscopy and the surface-IL interaction determined by *** main findings were that neat IL showed the best tribological behavior;the IL-containing mixture behaved similar to the base oil regarding friction,however outperformed the antiwear behavior of the base oil under higher temperature;surface-IL chemical interaction was found mainly at 100 °C.

关键词： ionic liquid additive friction wear polar oil

Towards trustworthy multi-modal motion prediction:Holistic evaluation and interpretability of outputs

在线全文

学校读者我要写书评

暂无评论

CAAI Transactions on Intelligence Technology 2024年第3期9卷 557-572页

作者： Sandra Carrasco Limeros Sylwia Majchrowska Joakim Johnander Christoffer Petersson MiguelÁngel Sotelo david fernández Llorca Computer Engineering Department Polytechnic SchoolUniversity of AlcalaMadridSpain AI Sweden GothenburgSweden Zenseact AB GothenburgSweden Department of Electrical Engineering Linköping UniversityLinköpingSweden Chalmers University of Technology GothenburgSweden European Commission Joint Research CentreSevilleSpain

Predicting the motion of other road agents enables autonomous vehicles to perform safe and efficient path *** task is very complex,as the behaviour of road agents depends on many factors and the number of possible future trajectories can be consid-erable(multi-modal).Most prior approaches proposed to address multi-modal motion prediction are based on complex machine learning systems that have limited ***,the metrics used in current benchmarks do not evaluate all aspects of the problem,such as the diversity and admissibility of the *** authors aim to advance towards the design of trustworthy motion prediction systems,based on some of the re-quirements for the design of Trustworthy Artificial *** focus is on evaluation criteria,robustness,and interpretability of ***,the evaluation metrics are comprehensively analysed,the main gaps of current benchmarks are identified,and a new holistic evaluation framework is ***,a method for the assessment of spatial and temporal robustness is introduced by simulating noise in the perception *** enhance the interpretability of the outputs and generate more balanced results in the proposed evaluation framework,an intent prediction layer that can be attached to multi-modal motion prediction models is *** effectiveness of this approach is assessed through a survey that explores different elements in the visualisation of the multi-modal trajectories and *** proposed approach and findings make a significant contribution to the development of trustworthy motion prediction systems for autono-mous vehicles,advancing the field towards greater safety and reliability.

关键词： autonomous vehicles evaluation interpretability multi-modal motion prediction robustness trustworthy AI

Variation in SARS-CoV-2 seroprevalence in children in the region of Asturias,Northern Spain

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Pediatrics 2022年第12期18卷 835-844页

作者： Elisa García-García Mercedes Rodríguez-Pérez david Pérez-Solís Carlos Pérez-Méndez Cristina Molinos-Norniella Ángeles Cobo-Ruisánchez Eva María fernández fernández Noelia García González Laura Calle-Miguel Pediatrics Department Centro de Salud LaviadaCalle Juanín de Mieres833207GijónSpain Microbiology Department Hospital Universitario Central de AsturiasOviedoSpain Pediatrics Department Hospital Universitario San AgustínAvilésSpain Pediatrics Department Hospital Universitario de CabueñesGijónSpain Pediatrics Department Hospital Carmen y Severo Ochoa.Cangas del NarceaSpain Pediatrics Department Centro de Salud TeatinosOviedoSpain Pediatrics Department Hospital Universitario Central de AsturiasOviedoSpain

Background Updated seroprevalence estimates are important to describe the severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)landscape and to guide public health *** aims are to describe longitudinal changes in seroprevalence in children in a region in Northern Spain and to analyze factors associated with SARS-CoV-2 *** Prospective multicenter longitudinal study with subjects recruited from July to September ***(up to 14 years old)were included and followed up until September *** blood samples were collected every six months during three testing rounds and were analyzed for SARS-CoV-2 *** data regarding epidemiological features,contact tracing,symptoms,and virological tests were *** evolution of SARS-CoV-2 seroprevalence during the study and the differences between children with positive and negative SARS-CoV-2 antibody tests were *** Two hundred children were recruited(50.5%girls,median age 9.7 years).The overall seroprevalence increased from round 1[1.5%,95%confidence interval(CI)0.3%–4.3%]to round 2(9.1%,95%CI 4.6%–12.7%)and round 3(16.6%,95%CI 9.5%–19.6%)(P<0.001).Main changes occurred in children aged zero to four years(P=0.001)who lived in urban areas(P<0.001).None of the children who were previously positive became *** multivariable analysis,three variables independently associated with SARS-CoV-2 seropositivity were identified:close contact with coronavirus disease 2019(COVID-19)confirmed or suspected cases[odds ratio(OR)=3.9,95%CI 1.2–12.5],previous positive virological test(OR=17.1,95%CI 3.7–78.3)and fatigue(OR=18.1,95%CI 1.7–193.4).Conclusions SARS-CoV-2 seroprevalence in children has remarkably increased during the time of our *** was the only COVID-19-compatible symptom that was more frequent in seropositive than in seronegative children.

关键词： Antibodies Child COVID-19 Seroepidemiologic studies

Towards an integrated risk analysis security framework according to a systematic analysis of existing proposals

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Computer Science 2024年第3期18卷 199-216页

作者： Antonio SANTOS-OLMO Luis Enrique SÁNCHEZ david G.ROSADO Manuel A.SERRANO Carlos BLANCO Haralambos MOURATIDIS Eduardo fernÁndez-MEDINA GSyA Research Group University of Castilla-La ManchaCiudad Real 13071Spain Institute for Analytics and Data Science University of EssexColchester CO43SQUK Alarcos Research Group University of Castilla-La ManchaCiudad Real 13071Spain ISTR Research group Department of Computer Science and ElectronicsUniversity of CantabriaSantander 39005Spain

The information society depends increasingly on risk assessment and management systems as means to adequately protect its key information *** availability of these systems is now vital for the protection and evolution of ***,several factors have led to an increasing need for more accurate risk analysis *** are:the speed at which technologies evolve,their global impact and the growing requirement for companies to *** analysis processes must consequently adapt to these new circumstances and new technological *** objective of this paper is,therefore,to present the results of an exhaustive analysis of the techniques and methods offered by the scientific community with the aim of identifying their main weaknesses and providing a new risk assessment and management *** analysis was carried out using the systematic review protocol and found that these proposals do not fully meet these new *** paper also presents a summary of MARISMA,the risk analysis and management framework designed by our research *** basis of our framework is the main existing risk standards and proposals,and it seeks to address the weaknesses found in these *** is in a process of continuous improvement,as is being applied by customers in several European and American *** consists of a risk data management module,a methodology for its systematic application and a tool that automates the process.

关键词： information security management security system security risk assessment and management

Seven-year follow-up of posterior chamber phakic intraocular lens with central port design

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Eye and Vision 2021年第1期8卷 223-231页

作者： Luis fernández-Vega-Cueto Belén Alfonso-Bartolozzi Carlos Lisa david Madrid-Costa JoséF.Alfonso fernández-Vega Ophthalmological Institute Avda.Dres.Fernández-Vega 11433012 OviedoSpain Optometry and Vision Department Faculty of Optics and OptometryUniversity Complutense de MadridMadridSpain

Background:To assess the clinical outcomes of the Visian Implantable Collamer Lens(ICL)with a central port throughout 7 years of ***:Eighty-four eyes of 52 patients were evaluated over a follow-up period of 7 years after V4c ICL ***(UDVA)and corrected(CDVA)distance visual acuities,refraction,intraocular pressure(IOP),endothelial cell density(ECD)and vault were ***:The mean postoperative UDVA(logMAR)was 0.04±0.11,0.13±0.19 and 0.17±0.23 at 1-,5-and 7-years,respectively(P20 mmHg or an increase higher than 5 mmHg)occurred in any case throughout the 7-year of *** loss in ECD from the preoperative baseline at the last follow-up visit was 2.6%.No intraoperative or postoperative complications or adverse events occurred during the follow-up ***:The outcomes of this study show the long-term viability of the V4c ICL implantation as a surgical option for the correction of myopia.

关键词： Implantable Collamer Lens ICL Myopia Long-term

Making bridges between preclinical and clinical insights into age-related cognitive decline

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8期20卷 2321-2322页

作者： david VC Brito Clévio Nóbrega Algarve Biomedical Center-Research Institute(ABC-RI) Campus GambelasFaroPortugal Algarve Biomedical Center-(ABC) Campus GambelasFaroPortugal Faculty of Medicine and Biomedical Sciences(FMCB) University of AlgarveGambelas CampusFaroPortugal

With people living longer,the societal impact of age-related cognitive decline is becoming more pronounced(Crimmins,2015).Thus,it is increasingly important to comprehend the cognitive shifts linked to aging-whether th... 详细信息

关键词： bridges becoming insight