检索结果-南通市图书馆

Output feedback adaptive super twisting sliding mode control for quadrotor UAVs

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Control Theory and Technology 2024年第1期22卷 92-105页

作者： Oscar salas-Peña Jesus DeLeón-Morales Susana V.Gutiérrez-Martínez École Centrale de nantes-LS2n UMR 6004 CNRS44300NantesFrance Facultad de Ingeniería Mecánica y Eléctrica Universidad Autónoma de Nuevo León66451San Nicolás de Los GarzaMexico

In this paper, a sliding mode control with adaptive gain combined with a high-order sliding mode observer to solve the tracking problem for a quadrotor UAV is addressed, in presence of bounded external disturbances and parametric uncertainties. The high order sliding mode observer is designed for estimating the linear and angular speed in order to implement the proposed scheme. Furthermore, a Lyapunov function is introduced to design the controller with the adaptation law, whereas an analysis of finite time convergence towards to zero is provided, where sufficient conditions are obtained. Regarding previous works from literature, one important advantage of proposed strategy is that the gains of control are parameterized in terms of only one adaptive parameter, which reduces the control effort by avoiding gain overestimation. numerical simulations for tracking control of the quadrotor are given to show the performance of proposed adaptive control–observer scheme.

关键词： Adaptive super twisting controller High-order sliding modes observer UAV

Ecology and local knowledge of the Baird’s tapir (Tapirella bairdii) in the Sierra Madre de Oaxaca, Mexico

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Integrative Zoology 2016年第5期11卷 361-374页

作者： Mario César LAVARIEGA nOLASCO Miguel BRIOnES-salas Amado MAZAS-TEODOCIO Elvira DURÁn-MEDInA Interdisciplinary Research Center for Integral Development Oaxaca UnitNational Polytechnic InstituteOaxacaMexico

As well as being of global cultural importance(from local tribal folklore to being an iconic species for conservation),the tapir plays an important role in its ecosystem as a herbivore and seed ***,the ecology and ethnozoology of the endangered Baird’s tapir in the north of Oaxaca,Mexico is poorly *** used camera traps to estimate its relative abundance and density and to describe the activity patterns of the northernmost population of Baird’s tapir in the Sierra Madre de *** knowledge concerning the tapir was also documented,along with the conservation strategies undertaken by the 2 indigenous communities that own the land where the study site is *** adult tapirs were photographed,and these were active 14 h per day,but were mainly nocturnal and *** estimated relative abundance(12.99±2.24 events/1000 camera days)and density values(0.07-0.24 individuals/km2)were both similar to those found in another site in Mexico located within a protected ***-structured interviews revealed that people have a basic understanding of the eating habits,activity and main predators of the *** were reports of hunting,although not among those respondents who regularly consume bush ***,the relative abundance and density estimates of tapir at the study site could be related to the favorable condition of the forest and the absence of hunting and consumption of tapir ***,the local people are conducting initiatives promoting the conservation of this ungulate and its habitat that combine to constitute a regional trend of habitat and wildlife protection.

关键词： camera-trapping density estimation random encounter model tapir conservation

Analysing changes in spatial point patterns:A proposal using data from a forest thinning experiment

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Forest Ecosystems 2022年第6期9卷 878-887页

作者： Christian salas-Eljatib Joaquín Riquelme-Alarcon Pablo J.Donoso Diego Ponce Daniel P.Soto Centro de Modelacion y Monitoreo de Ecosistemas Escuela de Ingeniería ForestalUniversidad MayorSantiagoChile Vicerrectoría de Investigacion y Postgrado Universidad de La FronteraTemucoChile Departamento de Silvicultura y Conservacion de la naturaleza Universidad de ChileSantiagoChile Instituto de Bosques y Sociedad Universidad Austral de ChileValdiviaChile Corporacion nacional Forestal ValdiviaChile Departamento de Ciencias naturales y Tecnología Universidad de AysenCoyhaiqueChile

Spatial patterns reveal critical features at the individual and community ***,how to evaluate changes in spatial characteristics remains largely *** assess spatial changes in spatial point patterns by augmenting current statistical functions and *** fitted functions to describe unmarked and marked(tree size)spatial patterns using data from a large-scale silvicultural experiment in southern ***,we compute the mingling index to represent spatial tree *** proffer the pair correlation function difference before and after treatment to detect changes in the unmarked-point pattern of trees and the semivariogram-ratio to evaluate changes in the marked-point *** research provides a quantitative assessment of a critical aspect of forest heterogeneity:changes in spatial unmarked and marked-point *** proposed approach can be a powerful tool for quantifying the impacts of disturbances and silvicultural treatments on spatial patterns in forest ecosystems.

关键词： Spatial diversity Marked-point process Spatial heterogeneity Conspecific Variable-density thinning nothofagus

Pitfalls of barcodes in the study of worldwide SARSCoV-2 variation and phylodynamics

在线全文

学校读者我要写书评

暂无评论

Zoological Research 2021年第1期42卷 87-93页

作者： Jacobo Pardo-Seco Alberto Gómez-Carballa Xabier Bello Federico Martinón-Torres Antonio salas Unidade de Xenética Instituto de Ciencias Forenses(INCIFOR)Facultade de MedicinaUniversidade de Santiago de Compostelaand GenPoB Research GroupInstituto de Investigación Sanitaria(IDIS)Hospital Clínico Universitario de Santiago(SERGAS)Galicia 15706Spain Genetics Vaccines and Pediatric Infectious Diseases Research Group(GENVIP)Instituto de Investigación Sanitaria de Santiago(IDIS)and Universidad de Santiago de Compostela(USC)Galicia 15706Spain Translational Pediatrics and Infectious Diseases Department of PediatricsHospital Clínico Universitario de Santiago de Compostela(SERGAS)Galicia 15706Spain

DEAR EDITOR,Analysis of SARS-CoV-2 genome variation using a minimal number of selected informative sites conforming a genetic barcode presents several *** show that purely mathematical procedures for site selection should be supervised by known phylogeny(i)to ensure that solid tree branches are represented instead of mutational hotspots with poor phylogeographic proprieties,and(ii)to avoid phylogenetic *** propose a procedure that prevents information redundancy in site selection by considering the cumulative informativeness of previously selected sites(as a proxy for phylogenetic-based criteria).This procedure demonstrates that,for short barcodes(e.g.,11 sites),there are thousands of informative site combinations that improve previous *** also show that barcodes based on worldwide databases inevitably prioritize variants located at the basal nodes of the phylogeny,such that most representative genomes in these ancestral nodes are no longer in ***,coronavirus phylodynamics cannot be properly captured by universal genomic barcodes because most SARS-CoV-2 variation is generated in geographically restricted areas by the continuous introduction of domestic variants.

关键词： dynamics properly purely

Biogeographical informativeness of Y-STR haplotypes

在线全文

学校读者我要写书评

暂无评论

Science Bulletin 2019年第19期64卷 1381-1384页

作者： Jacobo Pardo-Seco Alberto Gómez-Carballa Xabier Bello Federico Martinón-Torres Antonio salas Unidade de Xenética Instituto de Ciencias Forenses(INCIFOR)Facultade de MedicinaUniversidade de Santiago de Compostelaand GenPoB Research GroupInstitutode Investigaciones Sanitarias(IDIS)Hospital Clínico Universitario de Santiago(SERGAS)GaliciaSpain Grupo de Investigación en Genética VacunasInfecciones y Pediatría(GENVIP)Universidade de Santiago de Compostelaand Hospital Clínico Universitario de Santiago(SERGAS)GaliciaSpain

Research on biogeographical ancestry(BGA)is becoming of growing interest in forensic genetics and in the biomedical literature(1)Thus,for instance,the need to predict ethnicity of an unknown suspect based on DnA profiles found at the crime scene is of maximum interest in criminalistics[2],and several autosomal SnP panels have been designed and tested for BGA investigations[3,4].Most of these panels aim at discriminating three main continental groups(sub-Saharan Africans,Europeans,and Asians)by way of testing a number of ancestry informative markers(AIMs)that run from a few dozens to a few hundred[5](see more background in Supplementary data online).

关键词： BGA STR Biogeographical informativeness of Y-STR haplotypes

Effect of protease supplementation on apparent ileal crude protein and amino acid digestibility of over-processed soybean meals in broilers

在线全文

学校读者我要写书评

暂无评论

Journal of Animal Science and Biotechnology 2022年第6期13卷 1810-1817页

作者： Sergio Salazar-Villanea Maikol Astúa-Ureña Allison Masís-Montoya Juan I.Herrera-Muñoz Catalina salas-Durán Escuela de Zootecnia Universidad de Costa RicaSan JoséCosta Rica Centro de Investigación en nutrición Animal Universidad de Costa RicaSan JoséCosta Rica

Background: nutritional value of proteins in feed ingredients can be negatively affected by hydrothermal processing, which causes large variation in the bioavailability of amino acids(AA) and negatively affects animal productive performance. Supplementation of exogenous proteases could increase the rate of digestion of damaged proteins, thereby increasing overall AA digestibility and bioavailability. The aim was to determine the effect of exogenous protease supplementation on the apparent ileal digestibility(AID) of crude protein(CP) and AA of soybean meals(SBM) with different degrees of hydrothermal processing in ***: The experiment involved a 3 × 2 factorial arrangement, with SBM processing time(commercial SBM or autoclaved for 30 or 60 min at 120 ℃) and protease supplementation(not supplemented and supplemented) as factors. Protease was included at three times the recommended dose(0.06%) and the experimental diets were fed from 15 to 21 ***: The interaction between the effects of SBM processing and protease supplementation was significant for the AID of CP(P = 0.01), Trp(P = 0.01), Gly(P = 0.03) and Pro(P = 0.03), and also for the average daily gain(P = 0.01)and feed conversion ratio(P = 0.04). Increasing the processing time of SBM decreased(P no acids, whilst the effect of protease supplementation was only significant for the AID of Phe(P = 0.02) and Tyr(P = 0.01).Conclusions: Exogenous protease supplementation at three times the commercial dose does not seem to offset the negative effects of hydrothermal processing of SBM on the apparent ileal digestibility of CP and amino acids or performance of broilers. Whilst positive numerical improvements of digestibility and performance(ADG and FCR)were noticed with protease supplementation at relatively mild processing levels, negative results were obtained with the harsh-processed meals.

关键词： Amino acids Apparent ileal digestibility Broilers Exogenous protease

Mitochondrial DnA as a Risk Factor for False Positives in Case-Control Association Studies

在线全文

学校读者我要写书评

暂无评论

Journal of Genetics and Genomics 2015年第4期42卷 169-172页

作者： Antonio salas Joanna L.Elson Unidade de Xenética Instituto de Medicina Legaland Departamento de Anatomía Patolóxica e Ciencias ForensesFacultad de MedicinaUniversidad de Santiago de CompostelaGalicia 15782Spain Mitochondrial Research Group Institute of Genetic MedicineCentre for LifeNewcastle University Centre for Human Metabolomics North-West University

During the last decade, hundreds of studies have been pub- lished examining whether significant associations exist be- tween mitochondrial DnA （mtDnA） variants and/or haplogroups （clades） and particular diseases （generally com- mon/complex diseases）（Fig. 1）. However, several authors have gathered evidence indicating a high incidence of false positive findings in mtDnA case-control association studies. Raule et al. （2007） and Herrnstadt and Howell （2004） showed various problems affecting mtDnA case-control association studies. salas et al.

关键词： DnA Mitochondrial DnA as a Risk Factor for False Positives in Case-Control Association Studies

Morphometry and Mineral Content in the Seeds and Soil of Two Species of Argemone L.(Papaveraceae)in the Central Part of the Chihuahuan Desert

在线全文

学校读者我要写书评

暂无评论

Phyton-International Journal of Experimental Botany 2024年第2期93卷 371-386页

作者： Perla Patricia Ochoa-García Jaime Sánchez-salas Ricardo Trejo-Calzada Jesús JosafathQuezada-Rivera Fabián García-González Unidad Regional Universitaria de ZonasÁridas BermejilloUniversidad Autónoma ChapingoDurango35230México Facultad de Ciencias Biológicas Universidad Juárez del Estado de DurangoGómez PalacioDurango35010México

The genus Argemone L.(Papaveraceae)is found widely distributed in Mexico’s Chihuahuan Desert(CD).Some species of this genus are of phytochemical or ethnobotanical *** are inedible plants considered as *** date they have not been broadly studied;thus,their ecology is,to our knowledge,*** present work was centered around carrying out a morphometric analysis and the determination of minerals in the soil and seeds of the wild populations of Argemone at sites belonging to two ecoregions of the CD in *** April 2021 and April 2022,seeds of Argemone spp.,and soil samples were collected at 10 sites of the *** seeds were selected under a randomized design,and weight,length,diameter,thickness,buoyancy,and mineral content were *** soil samples were obtained under the Mexican regulation nOM-021-RECnAT-2000,and determinations of mineral content,electrical conductivity,apparent density,and soluble anions were *** information obtained was grouped by variable,species,and place of *** statistical tests consisted of an AnOVA,Tukey means tests considering p≤0.05,and a Principal Components *** pleiacantha exhibited differences in terms of weight(F=54.79,p=0.001),length(F=90.83,p=0.001),thickness(F=104.89,p=0.001),and diameter(F=155.82,p=0.001),and the differences in Argemone mexicana were in weight(F=46.71,p=0.001),thickness(F=187.49,p=0.001),length(F=191.56,p=0.001),and diameter(F=215.83,p=0.001).The evaluated seeds reached their maximal imbibition velocity at 24 h of *** content of the micro-and macro-nutrients analyzed in the seeds and soil suggest a tight relation with the morphometric characteristics of the seeds.

关键词： Micronutrients agricultural area semiarid zone ecoregion buoyancy

Green Synthesis of Silver nanoparticles from Abronia villosa as an Alternative to Control of Pathogenic Microorganisms

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 Renewable Materials 2020年第1期8卷 69-78页

作者： Ali Abdelmoteleb Benjamin Valdez-salas Ernesto Beltran-Partida Daniel Gonzalez-Mendoza Botany Department Faculty of AgricultureMenoufia UniversityShebin El-Kom32511Egypt Instituto de Ingeniería de la Universidad Autónoma de Baja California MexicaliBaja California21100México Instituto de Ciencias Agrícolas de la Universidad Autónoma de Baja California(ICA-UABC) Ejido Nuevo LeónBaja California21705México

The aim of this study was to evaluate the antibacterial and antifungal activities of eco-friendly synthesized silver *** silver nanoparticles were synthesized by biological method using aqueous extract of Abronia *** of silver nanoparticles was confirmed by color change and characterized using UV-visible spectroscopy,scanning electron microscope(SEM),energy dispersive X-ray spectroscopy(EDX),dynamic light scattering(DLS),and zeta potential *** SEM analysis revealed the presence of spherical silver nanoparticles of the size range 21 to 33 *** silver nanoparticles were used to evaluate their antibacterial effects at different concentrations(25,50,75 and 100μg/ml)on gram negative and gram positive *** biggest halo zone was observed at 75 and 100μg/ml concentrations of silver nanoparticles against both gram positive and gram negative *** activity of biosynthesized silver nanoparticles was evaluated against seven different phytopathogenic *** showed high inhibition of radial growth toward all tested *** highest inhibition of fungal growth by AgnPs was recorded against Macrophomina phaseolina(86.06±0.92%).Biosynthesized AgnPs using plant extract are a promising to use safety for various biomedical and agricultural applications.

关键词： Antibacterial activity antifungal activity green synthesis