检索结果-南通市图书馆

Full Duplex Media Access Control Protocol for Multihop Network Computing

在线全文

学校读者我要写书评

暂无评论

Computer Systems Science & Engineering 2023年第1期44卷 297-309页

作者： J.avila Selvi Therase S.Allwin A.Ahilan Department of CSE Infant Jesus College EngineeringThoothukudiTamil Nadu628851India Department of ECE PSN College of Engineering and TechnologyMelathediyoorTamil Nadu627152India

Intelligent communication technologies beyond the network are pro-posed by using a new full-duplex *** Media Access Control(MAC)is a data interaction network protocol,which outperforms the IEEE *** research discusses the planning and execution of full-duplex(FD)pipeline MAC protocol for multihop wireless networks(MWN).The design uses a com-bination of Radio frequency and baseband methods to realize full-duplexing with smallest impact on cross layer *** execution and trial results specify that Pipeline Media Access Control(PiMAC)protocol considerably develops net-work implementation in terms of transmission protocol(TP)and transmission *** advantage of using FD-MAC will increase the range of *** takes benefit of the FD mode of the antenna,which outperforms additionally 80%for all assessed *** this analysis,it was considered of that Psz=8184 bits and Rc=1Mbps;that’s,T_(DATA) represents an excellent portion of total *** on real nodes displays that the FD theme achieves a median gain of 90%in mix-ture throughput as equated to half-duplex(HD)theme for *** energy con-sumption of proposed system method is 29.8%reduced when compared with existing system method.

关键词： Beyondfifth-generation(B5G) FD MAC wi-finetworks wireless relay network multihop wireless networks

Driving Factors for Forest Fire Occurrence in Durango State of Mexico:A Geospatial Perspective

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

Chinese Geographical Science 2010年第6期20卷 491-497页

作者： Diana avila-Flores Marin Pompa-Garcia Xanat Antonio-Nemiga Dante A Rodriguez-trejo Eduardo Vargas-Perez Javier Santillan-Perez Forestry Division University of Chapingo Faculty of Forestry Juarez University of the State of DurangoRio Papaloapan and Durango Blvd Faculty of Geography Autonomous University of Mexico StateCerro de Coatepec s/nCiudad Universitaria

Forest fire is one of the major causes of forest loss and therefore one of the main constraints for sustainable forest management *** the driving factors and understanding the contribution of each factor are essential for the management of forest fire *** objective of this study is to identify variables that are spatially related to the occurrence and incidence of the forest fire in the State of Durango,*** this purpose,data from forest fire records for a five-year period were *** spatial correlations between forest fire occurrence and intensity of land use,susceptibility of vegetation,temperature,precipitation and slope were tested by Geographically Weighted Regression(GWR) method,under an Ordinary Least Square *** show that the spatial pattern of the forest fire in the study area is closely correlated with the intensity of land use,and land use change is one of the main explanatory *** addition,vegetation type and precipitation are also the main driving *** fitting model indicates obvious link between the *** fire was found to be the consequence of a particular combination of the environmental factors,and when these factors coexist with human activities,there is high probability of forest fire *** regulation of human activities is a key strategy for forest fire prevention.

关键词：森林火灾地理空间墨西哥土地利用变化人类活动因素驾驶最小二乘估计森林管理

Endoscopic ultrasound-guided gastroenterostomy for gastric outlet obstruction in Mexico

在线全文

学校读者我要写书评

暂无评论

World Journal of Surgical Procedures 2024年第3期14卷 15-20页

作者： Massiel Madelin Rosario-Morel Rodrigo Soto-Solis Katia Picazo-Ferrera Miriam Idalia Torres-Ruiz JoséAlberto Estradas-Trujillo mario Alberto Gallardo-Ramírez Gerardo Akram Darwich-del Moral Luis Ariel Waller-González Department of Endoscopy Centro Médico Nacional“20 de Noviembre”ISSSTEMexico City 03229Mexico Department of Gastroenterology HospitalÁngeles PedregalMexico City 10700Mexico Department of Endoscopy Centro Médico ABCMexico City 01120Mexico Department of Endoscopy Hospital General de México“Dr.Eduardo Liceaga”Mexico City 06720Mexico

BACKGROUND Endoscopic ultrasound-guided gastroenterostomy(EUS-GE)has recently emerged as an alternative treatment for gastric outlet obstruction(GOO)in selected *** To report the initial experience of EUS-GE in patients with *** This study was a retrospective,observational,multicenter study in which the data from 10 patients who underwent EUS-GE due to GOO between September 2021 and May 2023 were *** analyzed technical success,clinical success,adverse events,and *** success was defined as adequate positioning and deployment of the *** success was defined as the patient’s ability to tolerate oral intake without vomiting 7 d after the *** adverse events were *** Eleven procedures in 10 patients with GOO were *** mean age of the patients was 67.5 years(range:56-77 years).Malignant GOO was present in 9 *** success was achieved in 9/11 procedures(82%).Among them,clinical success was achieved in 9 patients(100%).Adverse events occurred in 1 patient(9%).The median survival was 3 months(n=7;range:1-8 months).CONCLUSION EUS-GE is a feasible therapeutic option in the treatment of GOO.

关键词： Endoscopic ultrasound-guided gastroenterostomy Gastric outlet obstruction Lumen apposing metal stent Interventional endoscopic ultrasound Gastrojejunostomy Duodenal stenting

Alpha-synuclein as a biomarker in Parkinson's disease: focus on neural derived extracelluar vesicles

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 2022年第7期17卷 1503-1504页

作者： Cristina Agliardi Franca R.Guerini mario Meloni mario Clerici IRCCS Fondazione Don Carlo Gnocchi MilanItaly Department of Pathophysiology and Transplantation University of MilanMilanItaly

The prevalence of Parkinson’s disease(PD)is rapidly increasing,and more than 12 million people are expected to suffer from PD by *** is a highly invalidating neurodegenerative condition that arises from the progressive degeneration of dopaminergic neurons in the substantia nigra pars *** main cause for such degeneration is the formation of cytoplasmic inclusions known as Lewy bodies.

关键词： degeneration Alpha prevalence

Lineament analysis as a seismic precursor:The El Mayor Cucapah earthquake of April 4,2010(MW7.2),Baja California,Mexico

在线全文

学校读者我要写书评

暂无评论

Geodesy and Geodynamics 2023年第2期14卷 121-129页

作者： Rosendo Romero-Andrade Manuel E.trejo-Soto Karan Nayak Daniel Hernández-Andrade Naccieli Bojorquez-Pacheco Faculty of Earth and Space Sciences Autonomous University of Sinaloa80013Culiacan RosalesSinaloaMexico

An earthquake called the MW7.2“El Mayor Cucapah”earthquake on April 4,2010 has been analyzed for seismic *** changes in the lineament system concerning its pattern and time intervals were analyzed during the earthquake preparation period and occurrence using the automated lineament detection *** Landsat 5 TM images were processed using LESSA and ADALGEO software obtaining similar *** statistical analysis revealed the stress accumulation due to plate interaction during earthquake *** study shows that the number of extracted lineaments changes rapidly about 23 months before the earthquake,and the systems return to the initial stage after 23 *** lineaments coincide with the extension of the San Andreas Fault as NW direction is the dominant ***,it can be concluded that the featural changes within the Rose diagram corresponding to the different strokes direction along with oriented elongation lines as disclosed in the present study using satellite images could be identified as a mid-term and/or short-term precursors of the ***,even though the dynamism of the El Mayor Cucapah earthquake is found in the extracted lineaments,it is possible to isolate more significant earthquakes even if new ones appear near the ***,using two algorithms for lineament detection allows for the tectonics to corroborate the obtained lineaments and dynamism.

关键词： Lineament analysis Earthquake Landsat images Seismic precursor

Spatiotemporal mode decomposition of ultrashort pulses in linear and nonlinear graded-index multimode fibers

在线全文

学校读者我要写书评

暂无评论

Photonics Research 2023年第5期11卷 750-756页

作者： mario ZITELLI VINCENT COUDERC mario FERRARO FABIO MANGINI PEDRO PARRA-RIVAS YIFAN SUN STEFAN WABNITZ Department of Information Engineering Electronics and TelecommunicationsUniversitàdegli Studi di Roma Sapienza00184 RomeItaly Universitéde Limoges XLIMUMR CNRS 725287060 LimogesFrance CNR-INO Istituto Nazionale di Ottica80078 PozzuoliItaly

We develop a spatiotemporal mode decomposition technique to study the spatial and temporal mode power distribution of ultrashort pulses in long spans of graded-index multimode fiber,for different input laser *** find that the beam mode power content in the dispersive pulse propagation regime can be described by the Bose-Einstein law,as a result of the process of power diffusion from linear and nonlinear mode coupling among nondegenerate mode *** the soliton regime,the output mode power distribution approaches the Rayleigh-Jeans law.

关键词： ultrashort multimode mode

Potential use of magnesium industrial waste for synthesis of Li and Mg co-doped LiMn_(2)O_(4)nanoparticles as cathode material for Li-ion batteries:Effect of sintering temperature

在线全文

学校读者我要写书评

暂无评论

Nano Research 2022年第5期15卷 4500-4516页

作者： Aleksei Llusco Luis Rojas Svetlana Ushak mario Grageda Department of Chemical Engineering and Mineral Processing and Center for Advanced Study of Lithium and Industrial Minerals(CELiMIN) Universidad de AntofagastaAntofagasta 1270300Chile

Potential advantages of active electrode nanomaterials have led to development of high energy and power density lithium-ion(Li-ion)***,under increasing demand for critical resources such as lithium and cobalt,it is necessary to use abundant raw materials,which can be obtained from industrial *** this work,purified Mg(OH)_(2)from waste generated in the production of Li2CO3 with natural brines from the Salar de Atacama(Chile)is used as a doping agent for synthesis of LiMn_(2)O_(4)(LMO)spinel octahedral nanoparticles co-doped with excess Li and *** of a pure cubic spinel phase(Fd3m)takes place at 500℃and sintering temperature effect at 580 and 750℃,thus the elemental composition and the structural,morphological,and electrochemical properties are studied in *** electrochemical performance at room temperature is obtained for Li_(1.03)Mg_(0.05)Mn_(1.92)O_(4)spinel sintered at 750℃with an initial discharge capacity of 121.3 mAh·g^(-1)and capacity retention of 94.0%after 100 cycles at C/3.A locally ordered spinel structure is obtained at 750℃,and doping with Mg^(2+)improves structural *** between both effects resulted in a high Li^(+)diffusion rate(1.29×10^(-9)cm^(2)·s^(-1))significantly improving cycling performance at elevated C-rates in 50℃.

关键词： LiMn_(2)O_(4)(LMO)spinel Mg doped excess Li octahedral nanoparticle industrial waste lithium-ion(Li-ion)batteries

A Systematic Review of Forensic Approaches to Disasters: Gaps and Challenges

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

International Journal of Disaster Risk Science 2023年第5期14卷 722-735页

作者： Adriano Mota Ferreira Victor Marchezini Tatiana Sussel Gonçalves Mendes Miguel Angel trejo-Rangel Allan Yu Iwama Graduate Program in Disasters Institute of Science and TechnologySão Paulo State University(Unesp)São Josédos CamposSP12247-004Brazil Cemaden–National Center for Monitoring and Early Warning of Natural Disasters São Josédos CamposSP12247-004Brazil Natural Hazards Center Institute of Behavioral ScienceUniversity of Colorado BoulderBoulderCO80309USA Department of Environmental Engineering Institute of Science and TechnologySão Paulo State University(Unesp)São Josédos CamposSP12247-004Brazil Irish Climate Analysis and Research UnitS(ICARUS) Department of GeographyMaynooth UniversityMaynoothW23 F2H6KildareIreland Graduate Program in Development and Environment Federal University of ParaíbaJoão PessoaPB58051-900Brazil

Disaster forensic approaches aim to identify the causes of disasters to support disaster risk ***,few studies have conducted a systematic literature review of scientific articles that labeled themselves as a forensic approach to *** article provides a qualitative analysis of these forensic studies,focusing on five main issues:(1)the methodologies applied;(2)the forensic approaches used in the disaster risk management phases;(3)the hazards addressed;(4)if the methodologies involve social participation,and using what types of participation;and(5)if there are references to urban planning in the scientific studies *** results showed a predominance of the Forensic Investigations of Disasters(FORIN)and Post-Event Review Capability(PERC)methodologies used in isolation or *** is a need for methodologies that engage people in participatory FORIN,fostering the co-production of knowledge and action research approaches.

关键词： Dynamic pressures Forensic investigation Participatory research Risk drivers Root causes

Design of protective and high sensitivity encapsulation layers in wearable devices

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2023年第1期66卷 223-232页

作者： WANG XiuFeng HUANG JieLong LIU YangChengYi TAN JinYuan CHEN ShangDa avila Raudel XIE ZhaoQian School of Materials Science and Engineering Xiangtan UniversityXiangian 41105China Department of Mechanical Engineering Northwestern UniversityEvanstonIL 60208USA State Key Laboratory of Structural Analysis for Industrial Equipment Department of Engineering MechanicsDalian University of TechnologyDalian116024China

Elastomeric encapsulation layers are widely used in soft, wearable devices to physically isolate rigid electronic components from external environmental stimuli(e.g., stress) and facilitate device sterilization for reusability. In devices experiencing large deformations, the stress-isolation effect of the top encapsulation layer can eliminate the damage to the electronic components caused by external forces. However, for health monitoring and sensing applications, the strain-isolation effect of the bottom encapsulation layer can partially block the physiological signals of interest and degrade the measurement accuracy. Here, an analytic model is developed for the strain-and stress-isolation effects present in wearable devices with elastomeric encapsulation layers. The soft, elastomeric encapsulation layers and main electronic components layer are modeled as transversely isotropicelastic mediums and the strain-and stress-isolation effects are described using isolation indexes. The analysis and results show that the isolation effects strongly depend on the thickness, density, and elastic modulus of both the elastomeric encapsulation layers and the main electronic component layer. These findings, combined with the flexible mechanics design strategies of wearable devices, provide new design guidelines for future wearable devices to protect them from external forces while capturing the relevant physiological signals underneath the skin.

关键词： strain-isolation effect stress-isolation effect elastomeric encapsulation transversely isotropic medium wearable devices