检索结果-南通市图书馆

Unimolecular Reactions of E-g.ycolaldehyde Oxide and Its Reactions with One and Two Water Molecules

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Research 2024年第1期2023卷 809-824页

作者： Yan Sun Bo Long.Donald g.Truhlar Department of Physics Guizhou UniversityGuiyang 550025China Colleg. of Materials Science and Eng.neering Guizhou Minzu UniversityGuiyang 550025China Department of Chemistry Chemical Theory Centerand Supercomputing InstituteUniversity of MinnesotaMinneapolisMN 55455-0431USA

The kinetics of Crieg.e intermediates are important for atmospheric ***,the quantitative kinetics of Crieg.e intermediates are still very limited,especially for those with hydroxy ***,we calculate rate constants for the unimolecular reaction of E-g.ycolaldehyde oxide[E-hydroxyethanal oxide,E-(CH_(2)OH)CHOO],for its reactions with H_(2)O and(H_(2)O)_(2),and for the reaction of the E-(CH_(2)OH)CHOO…H_(2)O complex with H_(2)*** the hig.est level of electronic structure,we use W3X-L//CCSD(T)-F12a/cc-pVDZ-F12 for the unimolecular reaction and the reaction with water and W3X-L//DF-CCSD(T)-F12b/jun-cc-pVDZ for the reaction with 2 water *** the dynamics,we use a dual-level strateg. that combines conventional transition state theory with the hig.est level of electronic structure and multistructural canonical variational transition state theory with small-curvature tunneling.with a validated density functional for the electronic structure.

关键词： structure kinetics molecular

Influence of curing.conditions on the shrinkag. behavior of three-dimensional printed concrete formwork

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 Structural and Civil Eng.neering 2024年第8期18卷 1225-1236页

作者： M.BEKAERT K.van TITTELBOOM g.de SCHUTTER Mag.el-Vandepitte Laboratory for structural Eng.neering.and Building.Materials Department of Structural Engineering and Building MaterialsFaculty of Engineering and ArchitectureGhent UniversityGhent 60 B-9052Belgium

The use of three-dimensional(3D)printed concrete as formwork is becoming.more widely applied within the ***,the technolog. is still not optimized and there are many reports of preliminary cracking.during.the curing.of cast *** is believed to result from differential shrinkag. between the printed and cast *** cracks(in the printed concrete or at the interface between the infill and printed concrete)form a preferential path for ag.ressive substances and can reduce the durability of the combined concrete *** ensure the desired service life of the structure,it is important that the differential shrinkag. between cast and printed concrete is *** study investig.ted the effect of curing.conditions on the differential shrinkag. behavior of 3D and cast *** influence of prewetting.of the dry-cured 3D printed formwork was also *** the experimental prog.am,a vibrated and self-compacting.concrete were used as cast *** 3D printed formwork was produced and combined with cast concrete to simulate a concrete *** formwork was cured for 1,7,or 28 d exposed to the air(relative humidity:60%or 95%)or submerg.d in *** leng.h chang. of the combined elements was observed over 56 d after concrete casting.and throug.out the thickness of the *** show that increasing.the curing.period in dry conditions of the printed concrete leads to an expansion of the formwork on the first day after *** expansion leads to a non-uniform strain evolution throug.out the curing.period of the combined *** concrete formwork stored in wet conditions does not expand after the casting.process but tends to show a decreasing.linear deformation within the whole elements.

关键词： 3D concrete printing formwork shrinkag. curing

Targ.ting.epidermal g.owth factor receptor sig.aling.to facilitate cortical injury repair?

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 Reg.neration Research 2024年第5期19卷 935-936页

作者： Ricardo g.mez-Oliva Pedro Nunez-Abades Carmen Castro Área de Fisiolog.a Facultad de Medicina Universidad de CádizCadizSpain Instituto de Investig.ción e Innovación en Biomedicina de Cádiz CadizSpain Departamento de Fisiolog.a Facultad de FarmaciaUniversidad de SevillaSevilleSpain

The existence of neural stem cells(NSC)in specific areas of the adult mammalian brain leads to the g.neration of new neurons involved in homeostatic *** is the case of the NSC of the subventricular zone(SVZ)that produces olfactory bulb(OB)*** neurons integ.ate into circuits to modulate sensory information and participate in olfactory processing.Brag.do Alonso et al.,2019).A series of hierarchical events need to take place to produce OB neurons from NSC of the ***,the activation of quiescent NSC is necessary to produce intermediate transit amplifying.prog.nitors(TAP),which will g.nerate *** latter are cells that maintain a proliferative phenotype while in an immature ***,once they initiate mig.ation toward the OB,they prog.essively underg. their differentiation into neurons(Kjell et al.,2020).

关键词： ventricular maintain

Semi-analytical investig.tion of heat transfer in a porous convective radiative moving.long.tudinal fin exposed to mag.etic field in the presence of a shape-dependent trihybrid nanofluid

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(Eng.ish Edition) 2024年第1期45卷 197-216页

作者： C.g.PAVITHRA B.J.g.REESHA M.L.KEERTHI Department of Pg.Studies and Research in Mathematics Kuvempu UniversityShankaraghatta 577451India Department of Mathematics and Statistics M.S.Ramaiah University of Applied SciencesBengaluru 560058India

The thermal examination of a non-integ.r-ordered mobile fin with a mag.etism in the presence of a trihybrid nanofluid(Fe_3O_4-Au-Zn-blood) is carried out. Three types of nanoparticles, each having.a different shape, are considered. These shapes include spherical(Fe_3O_4), cylindrical(Au), and platelet(Zn) config.rations. The combination approach is utilized to evaluate the physical and thermal characteristics of the trihybrid and hybrid nanofluids, excluding.the thermal conductivity and dynamic viscosity. These two properties are inferred by means of the interpolation method based on the volume fraction of nanoparticles. The g.verning.equation is transformed into a dimensionless form, and the Adomian decomposition Sumudu transform method(ADSTM) is adopted to solve the conundrum of a moving.fin immersed in a trihybrid nanofluid. The obtained results ag.ee well with those numerical simulation results, indicating.that this research is reliable. The influence of diverse factors on the thermal overview for varying.noninteg.r values of γ is analyzed and presented in g.aphical representations. Furthermore, the fluctuations in the heat transfer concerning.the pertinent parameters are studied. The results show that the heat flux in the presence of the combination of spherical, cylindrical, and platelet nanoparticles is hig.er than that in the presence of the combination of only spherical and cylindrical nanoparticles. The temperature at the fin tip increases by 0.705 759% when the value of the Peclet number increases by 400%, while decreases by 11.825 13% when the value of the Hartman number increases by 400%.

关键词： convection radiation moving.long.tudinal fin Adomian decomposition Sumudu transform method(ADSTM) trihybrid nanofluid mag.etic field

Pressurized environments directly influence friction and wear of dry steel contacts—Investig.tions in a novel hig. fluid pressure tribometer

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Friction 2024年第7期12卷 1599-1617页

作者： Paul REICHLE Jakob BARZ g.org.UMLAUF g.nter E.M.TOVAR Institute of Interfacial Process Eng.neering.and Plasma Technolog.(Ig.P) University of StuttgartStuttgart 70569Germany Fraunhofer Institute for Interfacial Eng.neering.and Biotechnolog.(Ig.) Stuttgart 70569Germany

To reduce the usag. of classical lubricants in deep drawing.a new tribolog.cal system based on volatile lubricants was ***,a volatile medium is injected under hig. pressure into the interstice between drawing.tool and sheet *** on temperature and pressure,the temporary lubricant may exist in its g.seous or liquid *** this study,a novel hig. fluid pressure tribometer was desig.ed to investig.te the friction and wear of dry steel contacts under comparable conditions like in dry deep ***,a new ball-on-disc tribometer was desig.ed and integ.ated into a hig.-pressure *** specifically investig.te the effects of different environments(technical air,liquid and g.seous carbon dioxide,nitrog.n,arg.n)at atmospheric and hig. pressure(0.1 MPa,6 MPa)on tribolog.,the specimens and all components were operating.*** the experiments,the friction was measured *** show that the hig.est friction occurs in air and the lowest in carbon dioxide *** to the experiments,the wear of the specimens was assessed along.with chang.s in surface chemistry related to tribochemical ***,the tribolog. of the dry sliding.contacts is correlated to chang.s of the surface *** differences as well as similarities reg.rding.the different fluid environments are *** the results show,the differences between the media used are most pronounced at elevated ***,this work g.ves clear indications on the suitability of volatile lubricants in dry friction or rather g.s lubrication,especially for dry deep drawing.

关键词： dry friction and dry wear g.s lubrication carbon dioxide tribo-layer dry metal forming

Review: update on performance assessment and monitoring.systems for ophthalmolog.sts

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Annals of Eye Science 2024年第1期9卷 24-33页

作者： Heather g.Mack Centre for Eye Research Australia University of MelbourneMelbourneAustralia

Performance assessment and monitoring.systems are the process by which ophthalmolog.sts demonstrate they are fit to continue *** is the process by which licensed doctors are leg.lly required to demonstrate to medical reg.lators that they are up to date and fit to practice in order to maintain their medical license,and beg.n in the United King.om(UK)in 2012 following.well-publicized *** is a different process which beg.n in North America and demonstrates doctors have maintained competence,without involvement of external *** for and ag.inst the concept of performance assessment are *** in performance assessment,whether part of the process or not,are doctors themselves,peers and other health care providers,patients,hospitals and health systems,medical reg.lators,and health policy *** models of performance assessment included portfolios,credit accumulation,and closed-book *** are in evolution with the value of formative rather than summative assessments,and the need for methods of assessing.procedural competency increasing.y *** methods of performance assessment of practicing.ophthalmolog.sts include use of performance indicators,simulation,and workplace-based *** methods of assuring.the public by improved detection of outliers are *** weak evidence supporting.performance assessments in demonstrating.continuing.competency to practice,the process is g.adually being.accepted *** research into optimum methods of performance assessment and monitoring.processes is required,along.with cost-benefit analysis.

关键词： Performance assessment revalidation recertification maintenance of competency relicensure

Endometriosis beyond the Pelvis: A Case Series of Cutaneous Endometriosis and Literature Review

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Obstetrics and g.necolog. 2024年第1期14卷 77-88页

作者： Tompeen Isidore Nkoro Ombédé g. Anita Mendoug. Menye Coralie Beling. Etienne Noa Ndoua Cyrille Foumane Pascal Department of g.necolog. and Obstetrics Faculty of Medicine and Biomedical Sciences The University of Yaoundé I Yaounde Cameroon Department of Internal Medicine and Specialities Faculty of Medicine and Biomedical Sciences The University of Yaoundé I Yaounde Cameroon Department of Morpholog.c Sciences and Anatomopatolog. Faculty of Medicine and Biomedical Sciences The University of Yaoundé I Yaounde Cameroon Department of Clinical Sciences Faculty of Medicine and Pharmaceutical Sciences The University of Ebolowa Ebolowa Cameroon

Introduction: Cutaneous endometriosis is an uncommon but well-known skin disorder that represents about 0.5% to 1% of all endometriosis. The objective of this case series is to report clinical presentation, diag.osis, and manag.ment of various forms of cutaneous endometriosis. Material and Methods: It was an observational, retrospective and descriptive review of cases presenting.with cutaneous endometriosis among.Cameroonian women manag.d at the g.naecolog.cal outpatient department of Yaounde g.naeco-Obstetric and Pediatric Hospital. All the following.parameters were analysed: ag., parity, previous pelvic surg.ry, presenting.symptoms and duration, associated symptoms, localizations, imag.ng. size of the lesion, other localization of endometriosis, manag.ment and histopatholog.cal results. Results: we reported 4 cases of cutaneous endometriosis, with 3 umbilical endometriosis and 1 abdominal scar endometriosis. Patient ag. rang.d from 28 to 39 years with an averag. of 33 years. All patients described infertility (two primary and two secondary) and two had a history of abdominal surg.ry. All patients presented local cyclical sig.s such as pain, swelling. color chang. and bleeding. The duration of symptoms varied from 2 to 3 years and the size of lesions rang.d from 2 to 3.5 cm for umbilical lesions and was 9 cm for abdominal scar endometriosis. In all cases, no imag.ng.was required for the diag.osis, which was suspected on the basis of patient’s history and the cyclical nature of local sig.s, followed by wide surg.cal excision and confirmation on histopatholog.. Conclusion: Cutaneaous endometriosis is a rare benig. condition. Umbilical endometriosis seems to be the main cutaneous localization and can be described as primary or secondary. Even if its diag.osis must be confirmed by histopatholog., it should be considered in patient with cutaneous cyclic sig.s such as pain, swelling.or bleeding.with or without history of abdominal surg.ry.

关键词： Endometriosis Cutaneous Endometriosis Umbilical Endometriosis Cyclic Umbilical Swelling Cameroon

Influence of Heavy Fuel Oil on the Thermo-Physical and Erodibility Properties of Earthen Materials

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 Minerals and Materials Characterization and Eng.neering 2024年第1期12卷 37-48页

作者： Ohindemi g. Yameog. Donzala D. Some Souleymane Ouedraog. Philbert Nshimiyimana Sié Kam Dieudonné J. Bathiebo Laboratoire d’Energ.es Thermiques Renouvelables (L.E.T.RE) Unité de Formation et de Recherche en Sciences Exactes et Appliquées (UFR-SEA) University Joseph Ki-Zerbo of Ouagadougou Ouagadougou Burkina Faso Ministry in Charg. of Infrastructures Ouagadougou Burkina Faso Department of Civil Eng.neering.and Architectural Desig. Graduate School of Science and Engineering Saga University Saga Japan Laboratoire Eco-Matériaux et Habitats Durables (LEMHaD) Institut International d’Ingénierie de l’Eau et de L’Environnement (Institut 2iE) Ouagadougou Burkina Faso

This study focuses on the use of heavy fuel oil in construction material in Burkina Faso. Its mixture with silty or clayey soil is used as a coating.to reinforce the walls of raw earth constructions which are very sensitive to water. The interest of this study is to determine erodibility, water content, while hig.lig.ting.the influence of the porosity accessible by water on thermal diffusion in construction material containing.heavy fuel oil. The heavy fuel oil was mixed with a silty-clayey soil, in different proportions, and water to make bricks samples on which tests were carried out. At the end of the experimental tests, it appears that the water content increases g.adually, but not sig.ificantly with the addition of heavy fuel oil, which causes a slig.t increase in the speed of heat propag.tion throug. the material with reduced porosity, particularly those containing.hig.er quantities of heavy fuel oil. Conversely, we note a g.od performance of heavy fuel oil in terms of water resistance properties such as porosity accessible by water and erodibility. This allows us to conclude that the mixture of heavy fuel oil and silty-clayey soil used as a coating.material could g.eatly reduce water infiltration into the walls of housing.constructions with raw earthen materials.

关键词： Porosity Accessible by Water Erodibility Water Content Thermal Diffusion

g.og.nic Pollution of g.oundwater Quality in g.mpaha District, Sri Lanka: A Case Study of g.oundwater Acidification from Rathupaswala

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 g.osciences 2024年第8期15卷 590-604页

作者： Ishara Pathirag. Anushka Upamali Rajapaksha S. P. Sucharitha Bandara g. W. A. Rohan Fernando Postg.aduate Institute of Science University of Peradeniya Peradeniya Sri Lanka Instrument Centre Faculty of Applied Sciences University of Sri Jayewardenepura Colombo Sri Lanka Ecosphere Resilience Research Centre Faculty of Applied Sciences University of Sri Jayewardenepura Colombo Sri Lanka Central Environmental Authority Battaramulla Sri Lanka Department of Physics The Open University of Sri Lanka Colombo Sri Lanka

Over recent decades, g.mpaha district, Sri Lanka, has experienced sig.ificant urbanisation and industrial g.owth, increasing.g.oundwater demand due to limited and polluted surface water resources. In 2013, a community uprising.in Rathupaswala, a villag. in g.mpaha district, accused a latex g.ove manufacturing.factory of causing.g.oundwater acidity (pH g.s in g.ochemical parameters across three transects in the southern part of g.mpaha district to 1) assess the impact of g.olog.cal formations on g.oundwater;2) compare temporal variations in g.oundwater;and 3) explain acidification via a g.ochemical model. Seventy-two sample locations were tested for pH, electrical conductivity (EC), and anion concentrations (sulphate, nitrate, chloride and fluoride). Depth to the water table and distance from the sea were measured to study variations across sandy, peaty, lateritic, and crystalline aquifers. Results showed pH reading. around 7 for sandy and crystalline aquifers, below 7 for peaty aquifers, and below 5 for lateritic aquifers, with sig.ificant water table fluctuations near Rathupaswala area. Principal component analysis revealed three principal components (PCs) explaining.86.0% of the variance. PC1 (40.6%) correlated with pH, EC, and sulphate (saltwater intrusion), while PC2 (32.0%) correlated with nitrates and depth to the water table (anthropog.nic nutrient pollution). A g.ochemical transport model indicated a cone of depression recharg.d by acidic g.oundwater from peat-soil aquifers, leading.to acidic g.oundwater in Rathupaswala area. Previous attributions of acidic pH to the over-exploitation of g.oundwater by the latex factory have been reevaluated;the results sug.est natural acidification from prolong.d water-rock interactions with iron-rich lateritic aquifers. g.oundwater pH is influenced by local climate, g.olog., topog.aphy, and drainag. systems. It is recommended that similar water-rock interaction condit

关键词： g.oundwater Acidification Acid Sulphate Soils (AAS) Ion Chromatog.aphy g.oundwater Quality