检索结果-南通市图书馆

Quality assessment of surgery for colorectal cancer:Where do we stand?

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 Gastrointestinal Surgery 2024年第4期16卷 982-987页

作者： Stefan Morarasu cristian Livadaru Gabriel-Mihail dimofte The Second department of Surgical Oncology Regional Institute of OncologyIasi 707483Romania

Quality assurance in surgery has been one of the most important topics of debate among colorectal surgeons in the past *** has produced new surgical standards that led in part to the impressive oncological outcomes we see in many units *** mesorectal excision,complete mesocolic excision(CME),and the Japanese d3 lymphadenectomy are now benchmark techniques embraced by many surgeons and widely recommended by surgical ***,there are still ongoing discrepancies in outcomes largely based on surgeon *** is one of the main reasons why many countries have shifted colorectal cancer surgery only to high volume *** markers of surgical quality is thus a perquisite to ensure that standards and oncological outcomes are met at an institutional *** the evolution of CME surgery,various quality markers have been described,mostly based on measurements on the surgical specimen and lymph node yield,while others have proposed radiological markers(*** stumps)measured on postoperative scans as part of the routine cancer *** is no ideal marker;however,taken together and assembled into a new score or set of criteria may become a future point of reference for reporting outcomes of colorectal cancer surgery in research studies and defining subspecialization requirements both at an individual and hospital level.

关键词： Colorectal cancer Colon surgery Arterial stump Complete mesocolic excision Surgical quality

Frontier of the Paleo-Tethys Ocean in the western Mediterranean:Isotopic(Sm-Nd)constraints on sources of devonian units from Menorca Island

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Geoscience Frontiers 2024年第5期15卷 323-338页

作者： Ricardo Arenas Jose M.Fuenlabrada cristian Timoner Rubén díez Fernández Esther Rojo-Pérez departamento de Mineralogía y Petrología and Instituto de Geociencias(UCM CSIC)Universidad ComplutenseMadridSpain Unidad de Geocronología(CAI de Ciencias de la Tierra y Arqueometría) Universidad ComplutenseMadridSpain Bayerisches Geoinstitut University of BayreuthBayreuthGermany Instituto Geológico y Minero de España–CSIC SalamancaSpain

The c.1000-m-thick pre-orogenic devonian mainly metapelitic sequence of North Menorca Island shows a fairly complete stratigraphic *** rocks of this sequence indicate gradually increasing deeper marine conditions of sedimentation towards its uppermost ***,the obtained sedimentary characteristics resemble those related to a deep and narrow basin-associated *** sills of Ti-augite-bearing alkaline gabbros occur within the devonian *** intensity of Variscan deformation increases downwards through the *** to the characteristics of the devonian sequence and its location within the Variscan Orogen,a correlation with similar units located in the southern sectors of the Central Iberian Zone(Iberian Massif)is *** devonian metapelitic rocks have geochemical characteristics suggesting that they represent moderately recycled mature siliciclastic sediments,generated from erosion of distant source areas belonging to an upper continental *** relatively narrow range of variation observed in initial^(143)Nd/^(144)Nd ratios supports a similar source for the Menorcan slates(0.51165–0.51182).However,a marked trend is observed in these isotope ratios,from lower values at the base of the stratigraphic column(minimum value of 0.511941)to higher values at the top(maximum value of 0.512131).The^(147)Sm/^(144)Nd ratios vary between 0.1074 and 0.1238,within the range defined for siliciclastic rocks with felsic crustal *** Nd model ages define a narrow range between 1496 Ma and 1754 Ma(Late Paleoproterozoic–Early Mesoproterozoic),and they are consistently younger *** data rule out a provenance from the erosion of the West Africa Craton,as they are more compatible with a provenance from regions located in the Trans-Saharan Belt or Sahara *** characteristics of the Menorcan devonian sequence are compatible with its deposition in a narrow and deep peri-Gondwanan transtensional basin,gener

关键词： Western Paleo-Tethys frontiers Menorca Island Sm-Nd isotopic constraints devonian sequence provenance in Gondwana

From BIM model to 3d construction printing:A framework proposal

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 Architectural Research 2024年第4期13卷 912-927页

作者： Rodrigo García-Alvarado Pedro Soza Ginnia Moroni Fernando Pedreros Martín Avendaño Pablo Banda cristian Berríos depto.diseño y Teoría de La Arquitectura Universidad Del Bío-BíoConcepciónChile depto.Arquitectura Universidad de ChileSantiagoChile Facultad de Ingeniería Arquitectura y DiseñoUniversidad San SebastiánConcepciónChile Facultad de Arquitectura Arte y DiseñoUniversidad Diego PortalesSantiagoChile

The growth of 3d construction printing needs appropriate integration into the planning and execution phases of building *** this aim,the Architecture,Engineering,and Construction sector(AEC)has been increasingly adopting building information modeling(BIM)systems to synchronize design and construction *** study proposes a technical workflow to manage 3d construction printing into BIM models,evaluating various procedures according to construction element *** on mature software platforms,the research details the data transfer process using a case study of a single-story *** case delves into design procedures for constructing walls of varied shapes,adjustments in width,joints,openings,textures,fillings,and the insertion of reinforcements and services while also discussing requirements of other building *** steps for managing design information and controlling printing machines are *** study’s outcome presents a comprehensive information flow,encompassing model segmentation,geometric data transfer,adjustments of details,and the generation of printing ***,it is offered a discussion that underlines the importance of a synergistic digital information flow that merges both design and execution phases,promoting construction efficiency and the embrace of innovative *** contribution of the paper focuses on technical design strategies for 3d construction printing,but also on suggesting an integrated process.

关键词： 3d construction printing Additive manufacturing Architectural design BIM

Blockade of Rho-associated kinase prevents inhibition of axon regeneration of peripheral nerves induced by anti-ganglioside antibodies

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 2024年第4期19卷 895-899页

作者： Andrés Berardo cristian R.Bacaglio Bárbara B.Báez Rubén Sambuelli Kazim A.Sheikh Pablo H.H.Lopez Laboratorio de Neurobiología Instituto de Investigación Médica Mercedes y Martin Ferreyra(INIMEC)-Consejo Nacional de Investigaciones Cientificas y Técnicas(CONICET)Universidad Nacional de Córdoba departamento de Química Biológica-Centro de Investigaciones en Química Biológica de Córdoba(CIQUIBIC)-Consejo Nacional de Investigaciones Cientificas y Técnicas(CONICET) Facultad de Cs.QuímicasUniversidad Nacional de Córdoba Servicio de Anatomía Patológica Clínica Universitaria Reina FabiolaUniversidad Católica de Córdoba department of Neurology University of Texas Medical School at Houston

Anti-ganglioside antibodies are associated with delayed/poor clinical recovery in Guillain-Barrèsyndrome,mostly related to halted axon ***-linking of cell surface gangliosides by anti-ganglioside antibodies triggers inhibition of nerve repair in in vitro and in vivo paradigms of axon *** effects involve the activation of the small GTPase Rho A/ROCK signaling pathways,which negatively modulate growth cone cytoskeleton,similarly to well stablished inhibitors of axon regeneration described so *** aim of this work was to perform a proof of concept study to demonstrate the effectiveness of Y-27632,a selective pharmacological inhibitor of ROCK,in a mouse model of axon regeneration of peripheral nerves,where the passive immunization with a monoclonal antibody targeting gangliosides Gd1a and GT1b was previously reported to exert a potent inhibitory effect on regeneration of both myelinated and unmyelinated *** results demonstrate a differential sensitivity of myelinated and unmyelinated axons to the pro-regenerative effect of *** with a total dosage of 9 mg/kg of Y-27632 resulted in a complete prevention of anti-Gd1a/GT1b monoclonal antibody-mediated inhibition of axon regeneration of unmyelinated fibers to skin and the functional recovery of mechanical cutaneous *** contrast,the same dose showed toxic effects on the regeneration of myelinated ***,scale down of the dosage of Y-27632 to 5 mg/kg resulted in a significant although not complete recovery of regenerated myelinated axons exposed to anti-Gd1a/GT1b monoclonal antibody in the absence of toxicity in animals exposed to only ***,these findings confirm the in vivo participation of Rho A/ROCK signaling pathways in the molecular mechanisms associated with the inhibition of axon regeneration induced by anti-Gd1a/GT1b monoclonal *** findings open the possibility of therapeutic pharmacological intervention targeting Rho A/R

关键词： anti-ganglioside antibodies anti-glycan antibodies axon regeneration ganglioside Guillain-Barrésyndrome nerve repair ROCK Y-27632

dynamic Analysis for the Global Performance of An SPM-Feeder-Cage System Under Waves and Currents

在线全文

学校读者我要写书评

暂无评论

China Ocean Engineering 2015年第3期29卷 415-430页

作者： cristian CIFUENTES M.H.KIM Ocean Engineering Program Department of Civil Engineering Texas A&M University College Station

In the present study, the dynamic response of a coupled SPM-feeder-cage system under irregular waves and shear currents is analyzed. A numerical model is developed by using the commercial software Orca Flex. Hydrodynamics coefficients of the vessel are calculated by using a 3d diffraction/radiation panel program. First- and second-order wave forces are included in the calculations. Morison equation is used to compute the drag force on line elements representing the net. drag coefficients are determined at every time step in the simulation considering the relative normal velocity between the structural elements and the fluid flow. The dynamic response of the coupled system is analyzed for various environments and net materials. The results of the study show the effects of solidity ratio of the net and vertical positions of the cage on the overall dynamic response of the system, confirming the viability of this type of configuration for future development of offshore aquaculture in deep waters.

关键词： offshore aquaculture SPM(single point mooring) feeder vessel connecting lines operational/survival environment drag force equivalent net cage grouping net modeling line tensions solidity ratio

In vitro calcification studies on bioprosthetic and decellularized heart valves under quasi-physiological flow conditions

在线全文

学校读者我要写书评

暂无评论

Bio-design and Manufacturing 2021年第1期4卷 10-21页

作者： cristian C.d’Alessandro Andreas dimopoulos Sofia Andriopoulou Gerasimos A.T.Messaris Sotirios Korossis Petros Koutsoukos dimosthenis Mavrilas Laboratory of Biomechanics and Biomedical Engineering Department of Mechanical Engineering and AeronauticsUniversity of PatrasPatrasGreece department of Cardiothoracic Transplantation and Vascular SurgeryHannover Medical SchoolHannoverGermany department of Medical Physics University Hospital of PatrasPatrasGreece Wolfson School of Mechanical Electrical and Manufacturing EngineeringLoughborough UniversityLoughboroughUK department of Chemical Engineering University of PatrasPatrasGreece FORTH-Institute of Chemical Engineering Sciences PatrasGreece

The lifespan of biological heart valve prostheses available in the market is limited due to structural alterations caused by calcium phosphate deposits formed from blood plasma in contact with the *** objective of this work is to present a comparative methodology for the investigation of the formation of calcium phosphate deposits on bioprosthetic and tissue-engineered scaffolds in vitro and the influence of mechanical forces on tissue *** on earlier investigations on biological mineralization at constant supersaturation,a circulatory loop simulating dynamic blood flow and physiological pressure conditions was *** system was appropriately adapted to evaluate the calcification potential of decellularized(dCV)and glutaraldehyde-fixed(GAV)porcine aortic *** indicated that dCV calcified at higher,statistically nonsignificant,rates in comparison with *** difference was attributed to the tissue surface modifications and cell debris leftovers from the decellularization *** analysis of the solids deposited after 20 h by scanning electron microscopy in combination with chemical microanalysis electron-dispersive spectroscopy identified the solid formed as octacalcium phosphate(Ca8(PO4)6H2·5H2O,OCP).OCP crystallites were preferentially deposited in high mechanical stress areas of the test ***,GAV tissues developed a significant transvalvular pressure gradient increase past 36 h with a calcium deposition distribution similar to the one found in explanted *** conclusion,the presented in vitro circulatory model serves as a valuable prescreening methodology for the investigation of the calcification process of bioprosthetic and tissue-engineered valves under physiological mechanical load.

关键词： Reactors Calcification Constant composition reactor Heart valve In vitro Mechanical load Tissue engineering

Jet CAT P80 Thermal Analyses and Performance Assessment Using different Fuels Types

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2018年第4期27卷 389-393页

作者： Grigore CICAN Adina TOMA cristian PUSCASU Razvan CATANA Politehnica University of Bucharest Faculty of Aerospace Engineering 1-7 Polizu Street 011061 Bucharest 1 Romania National Research and development Institute for Gas Turbines - COMOTI 220D Iuliu Maniu Ave Bucharest 6 Romania

The micro gas turbine propulsion systems represent a good choice for the unmanned aerial vehicles(UAVs). The present work monitors the engine parameters, correlating them with other important engine instrumentation data. The aim of this research was to study the operation of the Jet CAT using various types of fuels under various operating conditions: normal acceleration and sudden acceleration. The measured parameters were monitored under different conditions:(A) Engine operation at two different ambient temperatures – outdoor at 0oC and inside at 19oC; and(B) Using 4 fuel types: kerosene, diesel fuel, kerosene with 5% gasoline and kerosene with 10% gasoline. The relevance of this work is given by the fact that a detailed analysis is performed for the idle regime. The paper will present the detailed test plan used and the most relevant charts with the obtained results for: start time, force, temperature before turbine, fuel flow, depending on micro turbo engine speed.

关键词： Jet CAT P80 fuel performance testing thermal analysis

Positive interactions by cushion plants in high mountains:fact or artifact?

在线全文

学校读者我要写书评

暂无评论

Journal of Plant Ecology 2016年第2期9卷 117-123页

作者： Marco A.Molina-Montenegro Rómulo Oses Ian S.Acuña-Rodríguez cristian Fardella Ernesto I.Badano Patricio Torres-Morales Jorge Gallardo-Cerda cristian Torres-díaz Instituto de Ciencias Biológicas Universidad de TalcaAvda.Lircay s/nTalcaChile Centro de Estudios Avanzados en ZonasÁridas(CEAZA) Facultad de Ciencias del MarUniversidad Católica del NorteCoquimboChile división de Ciencias Ambientales Instituto Potosino de Investigación Científica y TecnológicaCamino a la Presa San José2055Colonia Lomas ta Sección CP 78216San Luis PotosíSLPMéxico 4 Instituto de Ciencias Ambientales y EvolutivasUniversidad Austral de ChileValdiviaChile departamento Científico Instituto Antártico Chileno(INACH)Punta ArenasChile Laboratorio de Genómica y Biodiversidad(LGB) Departamento de Ciencias NaturalesUniversidad del Bío-BíoChillánChile

Positive interactions are defined as non-trophic interactions where at least one of the interacting species is benefited in terms of fitness and the other remains ***,the bidirectional feedbacks between species may be positive,neutral or ***,if facilitated species induce negative effects on their‘nurses’,the assumed definition of positive interactions could be *** We assessed if ecological interactions between cushions of Azorella madreporica and their facilitated species are ***,we tested if cover of facilitated species has any costs for cushion plants from an ecophysiological perspective,and if these costs increase with the amount of cover of facilitated *** addition,through pathway analysis and correlations,we assessed if cover and richness of facilitated species have a direct and/or indirect effect on the fitness of cushion *** Findings We found that facilitated plant species induced a significant cost for their nurses(cushion plants),and this cost increases with cover of the facilitated ***,the facilitated species exert a strong direct negative effect on the cushion’s fitness and a moderate indirect negative cost evident through the nutrient status and physiological performance of cushion *** thus contribute evidence that positive interactions between high mountain cushion plants of central Chile and their‘facilitated’species may be an artifact more than a fact,especially when bidirectional effects are considered;contrasting with the majority of studies that document only one side of the interaction.

关键词： cushion plants facilitation nurse effect positive interactions stress gradient hypothesis

A comparative study for the performance of encased granular columns

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 Rock Mechanics and Geotechnical Engineering 2019年第2期11卷 379-388页

作者： Iman Hosseinpour cristian Soriano Marcio S.S.Almeida department of Civil Engineering Faculty of EngineeringThe University of Guilan Graduate School in Research and Engineering (COPPE) Federal University of Rio de Janeiro (UFRJ)

This paper describes a three-dimensional(3d) numerical analysis of a test embankment on geotextileencased columns(GECs), in comparison with two-dimensional(2d) axisymmetric and plane strain analyses. The 3d numerical analysis was performed considering a rectangular strip under the embankment centerline. The 2d analysis was also carried out using axisymmetric unit cell and plane strain *** results indicated that the adopted 3d strip model represented well the measured deformations and pore pressure evolution during embankment construction and post-contraction *** the unit cell model, both plane strain and 3d analyses could properly determine the settlement profile along the embankment base as well as the profile of the horizontal soil deformation beneath the embankment toes. The plane strain analysis, however, was not able to compute the geotextile ring force which might be simply calculated using the axisymmetric unit cell approach. The paper also showed that, due to horizontal boundary fixities applied to the embankment borders, the unit cell model clearly underestimated the tension developed in the basal geogrid.

关键词： Soft soil Embankment Encased columns Geosynthetic Numerical analysis