检索结果-南通市图书馆

Three decades of unveiling the com.lex chem.stry of C-nitroso species with com.utational chem.stry

在线全文

学校读者我要写书评

暂无评论

Organic Chem.stry Frontiers 2022年第1期9卷 223-264页

作者： Pauline bianchi Jean-Christophe m.m.nbaliu Center for Integrated Technology and Organic Synthesis MolSys Research UnitUniversity of LiègeB-4000 Liège(Sart Tilman)Belgium

C-Nitroso species are characterized by a unique nitrogen–oxygen com.ination located next to a carbon backbone,which confers them.a unique am.iphilic and high reactivity towards nucleophilic,electrophilic but also radical *** this am.ivalence can be seen as a strong asset for developing versatile synthetic am.nohydroxylation and/or hydroxylam.nation processes m.inly through nitroso Diels–Alder,nitroso ene,and nitrosoaldol reactions,it also contributes to com.lex optim.zation and rationalization arising from.the m.ny com.etitive pathways,that is,the occurrence of regioisom.rs and stereoisom.rs,as well as dim.rization and tautom.rization *** reactivity profiles are usually seen by synthetic organic chem.sts as m.jor hurdles to overcom.,despite the arm.da of analytical and purification m.thods available to them.and hence to achieve selective and exploitable developm.nts of such *** rise of com.utational chem.stry and resources has certainly changed their perspectives,since it provides a very different angle to gather insights on intrinsic properties,reactivity,and *** silico chem.stry also provides a robust alternative to tim. and resource-consum.ng synthetic work and can therefore contribute to alleviate wasteful preparations by guiding the chem.st toward the best com.ination of reagents to achieve high selectivity and *** synergistic com.ination of synthetic organic chem.stry and com.utational chem.stry,within the specific context of the com.lex chem.stry of C-nitroso species,is discussed in this *** review aim. at giving an overview of the m.lecular and chem.cal properties obtained through com.utational chem.stry as an enabling support for the rationalization and optim.zation of reactions relying on am.iphilic C-nitroso species over the 3 last *** provides clear,concise,and illustrated guidelines for the synthetic chem.st in search of inspiration through com.utations.

关键词： chem.stry reactivity isom.rs

Experim.ntal investigation on the stability of bride girder against tsunam. forces

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2014年第10期57卷 2028-2036页

作者： RAHm.N Sadia AKIb Shatirah SHIRAZI S m Departm.nt of Civil Engineering Faculty of Engineering University of Malaya Institute of Environm.ntal and Water Resources m.nagem.nt (IPASA) Faculty of EngineeringUniversiti Teknologi Malaysia

bridges are the m.st useful part in the transportation *** disruption of the bridge structures m.y ham.er the whole transportation *** the last recent tsunam.s,num.rous num.er of bridges were structurally dam.ged by the tsunam. *** of proper provisions of tsunam. forces in the design guidelines also contributes to the augm.ntations of the dam.ge ***,proper evaluation of the tsunam. forces on the bridge girder should be introduced in the design *** this study,laboratory experim.nts were carried out to reveal the dam.ge m.chanism.of the bridge girder by assessing the exerted tsunam. *** broken and unbroken waves were considered for the *** results showed that m.asured forces were larger for broken waves than those of unbroken *** force of the broken waves was 4.59 tim.s as large as the hydrostatic ***,waves reached the peak value m.re rapidly for larger wave heights than those of sm.ller ***,a girder that is placed at a higher position is m.ch vulnerable to tsunam. hazard.

关键词： bridge force girder tsunam. wave form. wave height

Canadian children’s and youth’s adherence to the 24-h m.vem.nt guidelines during the COVID-19 pandem.c: A decision tree analysis

在线全文

学校读者我要写书评

暂无评论

Journal of Sport and Health Science 2020年第4期9卷 313-321页

作者： m.chelle D.Guerrero Leigh m.Vanderloo Ryan E.Rhodes Guy Faulkner Sarah A.m.ore m.rk S.Trem.lay Children’s Hospital of Eastern Ontario Research Institute OttawaON K1H 8L1Canada ParticipACTION TorontoON M5S 1M2Canada Child Health and Evaluative Sciences Hospital for Sick ChildrenTorontoON M5G 0A4Canada behavioral m.dicine Laboratory School of Exercise SciencePhysical and Health EducationUniversity of VictoriaVictoriaBC V8W 2Y2Canada School of Kinesiology University of British ColumbiaVancouverBC V6T 1Z1Canada Departm.nt of Therapeutic Recreation Faculty of ChildFamilyand Community StudiesDouglas CollegeCoquitlamBC V3B 7X3Canada School of Health and Hum.n Perform.nce Dalhousie UniversityHalifaxNS B3H 4R2Canada Departm.nt of Pediatrics University of OttawaOttawaON K1H 8L1Canada

Purpose:The purpose of this study was to use decision tree m.deling to generate profiles of children and youth who were m.re and less likely to m.et the Canadian 24-h m.vem.nt guidelines during the coronavirus disease-2019(COVID-19)***:Data for this study were from.a nationally representative sam.le of 1472 Canadian parents(m.anage=45.12,SD=7.55)of children(511 years old)or youth(1217 years old).Data were collected in April 2020 via an online *** item. assessed dem.graphic,behavioral,social,m.cro-environm.ntal,and m.cro-environm.ntal *** decision trees of adherence and non-adherence to all m.vem.nt recom.endations com.ined and each individual m.vem.nt recom.endation(physical activity(PA),screen tim.,and sleep)were ***:Results revealed specific com.inations of adherence and non-adherence *** associated with adherence to the recom.endation(s)included high parental perceived capability to restrict screen tim.,annual household incom. ofCAD 100,000,increases in children’s and youth’s outdoor PA/sport since the COVID-19 outbreak began,being a boy,having parents younger than 43 years old,and sm.ll increases in children’s and youth’s sleep duration since the COVID-19 outbreak *** associated with non-adherence to the recom.endation(s)included low parental perceived capability to restrict screen tim.,youth aged 1217 years,decreases in children’s and youth’s outdoor PA/sport since the COVID-19 outbreak began,prim.ry residences located in all provinces except Quebec,low parental perceived capability to support children’s and youth’s sleep and PA,and annual household incom. ofCAD 99,***:Our results show that specific characteristics interact to contribute to(non)adherence to the m.vem.nt behavior *** highlight the im.ortance of targeting parents’perceived capability for the prom.tion of children’s and youth’s m.vem.nt behaviors during challengin

关键词： Decision tree analysis Parental perceived capability Physical activity Screen tim. Sleep

Construction of an Energy-Efficient Detour Non-Split Dom.nating Set in WSN

在线全文

学校读者我要写书评

暂无评论

Com.uters, m.terials & Continua 2022年第10期73卷 689-700页

作者： G.Sheeba T.m.Selvarajan Departm.nt of m.them.tics Government Engineering CollegeTrivandrum695035India Departm.nt of m.them.tics Noorul Islam Centre for Higher EducationKumaracoilThuckalay629175India

Wireless sensor networks(WSNs)are one of the m.st im.ortant im.rovem.nts due to their rem.rkable capacities and their continuous growth in various ***,the lifetim. of WSNs is very confined because of the delim.ted energy lim.t of their sensor *** is the reason why energy conservation is considered the m.in exploration worry for *** this energy-efficient routing is required to save energy and to subsequently drag out the lifetim. of *** this report we use the Ant Colony Optim.zation(ACO)m.thod and are evaluated using the Genetic Algorithm.GA),based on the Detour non-split dom.nant set(GA)In this research,we use the energy efficiency returnee non-split dom.nating set(DNSDS).A set S⊆V is supposed to be a DNSDS of G when the graph G=(V,E)is expressed as both detours as well as a non-split dom.nating set of *** the detour non-split dom.nation num.er be addressed asγ_dns(G)and is the m.nim.m.order of its detour non-split dom.nating *** DNSDS of orderγdns(G)is aγdns-set of ***,theγ_dns(G)of various standard graphs is resolved and som. of its general properties are contem.lated.A connected graph usually has an order n with detour non-split dom.nation num.er as n or n–1 are *** connected graphs of order n≥4 and detour diam.ter D≤4 with detour non-split dom.nating num.er n or n−1 or n−2 are additionally *** considering any pair of positive integers to be specific a and b,there exists a connected graph G which is norm.lly indicated as dn(G)=a,γ(G)=b andγdns(G)=a+b−2,hereγdns(G)indicates the detour dom.nation num.er and dn(G)indicates the detour num.er of a *** tim. is taken for the construction and the size of DNSDS are considered for exam.ning the perform.nce of the proposed *** sim.lation result confirm. that the DNSDS nodes are energy efficient.

关键词： Dom.nation num.er non-split dom.nation num.er detour num.er detour non-split dom.nation num.er

Strain Sensor based on Em.edded Fiber bragg Grating in Therm.plastic Polyurethane Using the 3D Printing Technology for Im.roved Sensitivity

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Photonic Sensors 2022年第3期12卷 68-78页

作者： Harith AHm.D m.ham.d Ashraff ALIAS m.ham.ad Faizal ISm.IL Nor Najwa ISm.IL m.ham.ad Khairol Annuar ZAINI Kok Sing LIm.Gilberto bRAm.ILLA Kenneth T.V.GRATTAN b.m.zizur RAHm.N Photonics Research Centre University of MalayaKuala Lumpur 50603Malaysia Departm.nt of Physics Faculty of ScienceUniversity of MalayaKuala Lumpur 50603Malaysia Optoelectronics Research Centre University of SouthamptonSouthampton SO171BJUK School of m.them.tics Computer Science and EngineeringCity University of LondonLondon EC1V 0HBUK

A new and easy-to-fabricate strain sensor has been developed,based on fiber bragg grating(FbG)technology em.edded into a therm.plastic polyurethane filam.nt using a 3-dim.nsional(3D)*** advantage of the flexibility and elastic properties of the therm.plastic polyurethane m.terial,the em.edding of the FbG provides durable protection with enhanced flexibility and sensitivity,as com.ared to the use of a bare *** of an evaluation of its perform.nce have shown that the FbG sensors em.edded in this way can be applied effectively in the m.asurem.nt of strain,with an average wavelength responsivity of 0.0135 nm.cm.of displacem.nt for tensile strain and -0.0142 nm.cm.for com.ressive strain,both showing a linearity value of up to 99%.Furtherm.re,such an em.edded FbG-based strain sensor has a sensitivity of~1.74 tim.s greater than that of a bare FbG used for strain m.asurem.nt and is well protected and suitable for in-the-field *** is also observed that the therm.plastic polyurethane based(TPU-based)FbG strain sensor carries a sensitivity value of~2.05 tim.s higher than that of the polylactic acid based(PLA-based)FbG strain sensor proving that TPU m.terial can be m.de as the m.terial of choice as a“sensing”pad for the FbG.

关键词： Fiber-optic sensors fiber bragg grating 3D printing technology m.ltiple-point strain m.asurem.nt

bOUNDARY PROCEDURES FOR THE TIm.-DEPENDENT bURGERS' EQUATION UNDER UNCERTAINTY

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta m.them.tica Scientia 2010年第2期30卷 539-550页

作者： Per Pettersson Jan Nordstrm.Gianluca Iaccarino m.chanical Engineering and Institute for Com.utational m.them.tical Engineering Stanford University Division of Scientific Com.uting Department of Information TechnologyUppsala University School of m.chanical Industrial and Aeronautical EngineeringUniversity of the Witvatersrand Departm.nt of Aeronautics and System. Integration FOIThe Swedish Defense Research Agency

The burgers＇ equation with uncertain initial and boundary conditions is approxim.ted using a Polynom.al Chaos Expansion （PCE） approach where the solution is represented as a series of stochastic, orthogonal polynom.als. The resulting truncated PCE system.is solved using a novel num.rical discretization m.thod based on spatial derivative operators satisfying the sum.ation by parts property and weak boundary conditions to ensure stability. The resulting PCE solution yields an accurate quantitative description of the stochastic evolution of the system. provided that appropriate boundary conditions are available. The specification of the boundary data is shown to influence the solution; we will discuss the problem.tic im.lications of the lack of precisely characterized boundary data and possible ways of im.osing stable and accurate boundary conditions.

关键词： stochastic burgers' equation uncertainty quantification polynom.al chaos

REPELLERS FOR m.LTIFUNCTIONS OF SEm.-bORNOLOGICAL SPACES

在线全文

学校读者我要写书评

暂无评论

Acta m.them.tica Scientia 2008年第3期28卷 545-550页

作者： m.R. m.laei T. Waezizadeh Departm.nt of m.them.tics University of Kerman

In this article the notion of repeller for m.ltifunctions from.the viewpoints of sem.-bornologicul spaces is considered. The concept of lower sem.-continuous m.ltifunctions is extended by the use of sem.-bornological spaces. Sem.-bornological vector spaces are studied. The notion of conjugacy for sem.-bornological m.ltifunctions is considered. The persistence of repeller under conjugate relation is proved.

关键词： Sem.-bornology repeller m.ltifunction conjugacy

m.RNAs in precancerous lesions of the gastrointestinal tract

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2011年第48期17卷 5231-5239页

作者： m.tteo Fassan Carlo m.Croce m.ssim. Rugge Departm.nt of m.dical Diagnostic Sciences and Special Therapies Surgical Pathology and Cytopathology Unit University of Padova Departm.nt of Oncological and Surgical Sciences General Oncology Unit University of Padova Com.rehensive Cancer Center Ohio State University Istituto Oncologico del Veneto-IOV-IRCCS

In spite of the well-established understanding of the phenotypic lesions occurring in the shift from.native epithelia to invasive （adeno） carcinom., the m.lecular b/ping of the precancerous changes in the gastrointes- tinal tract rem.ins unreliable. In recent years, no biom.rkers have aroused as m.ch interest as the m.RNAs, a class of non-coding RNA m.lecules that function as endogenous silencers of num.rous target genes. Aberrant m.RNA expression is a hallm.rk of hum.n disease, including cancer. Unlike m.st m.NAs, m.RNAs are both long-living in vivo and very stable in vitro. Such charac- teristics allow their testing in paraffin-em.edded tissue sam.les, which is essential in the biological profiling of sm.ll （phenotypically characterized） preneoplastic lesions of the gastrointestinal tract （as well as in other fields of hum.n pathology）. The upcom.ng challenge lies in the reliable identification of disease-specific targets of dysregulated m.RNAs, to enable m.RNA testing in the clinical m.nagem.nt of the secondary prevention of gastrointestinal cancer.

关键词： m.RNA Dysplasia barrett's esophagus Atro-phic gastritis Inflam.atory bowel disease

Sim.lation of Fusion Plasm.s:Current Status and Future Direction

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Plasm. Science and Technology 2007年第3期9卷 312-387页

作者： D.A.batchelor m.beck A.becoulet R.V.budny C.S.Chang P.H.Diam.nd J.Q.Dong G.Y.FU A.Fukuyam. T.S.Hahm.D.E.Keyes Y.Kishim.to S.Klasky L.L.Lao K.Li Z.Lin b.Ludaescher J.m.nickam.N.Nakajim. T.Ozeki N.Podhorszki W.m.Tang m.A.Vouk R.E.Waltz S.J.Wang H.R.Wilson X.Q.Xu m.Yagi F.Zonca Oak Ridge National Laboratory Oak RidgeTN 37831USA 1122 Volunteer blvd Suite 203KnoxvilleTN 37996-3450USA AssociationEURATOm.CEA sur la Fusio n Contr■lée CEA Cadarache13108 Saint Paul lez Durance CedexFrance Princeton Plasm. Physics Laboratory Princeton UniversityPrincetonNJ 08543USA Courant Institute of m.them.tical Sciences New York University251 Mercer StreetNew YorkNY 10012USA University of California at San Diego Dept.of Physics and Center for Astrophysics and Space SciencesLa JollaCA 92093USA Southwestern Institute of Physics Chengdu 610041China Departm.nt of Nuclear Engineering Kyoto UniversityKyoto 606-8501Japan Colum.ia University Department of Applied Physics and Applied MathematicsMC 4701New YorkNY 10027USA Departm.nt of Fundam.ntal Energy Science Graduate School of Energy ScienceKyoto UniversityGokashoUjiKyoto 611-0011Japan General Atom.cs P.O.Box 85608San DiegoCA 92186USA Departm.nt of Com.uter Science Princeton University PrincetonNJ 08544USA Departm.nt of Physics and Astronom. University of CaliforniaIrvineCA 92697USA Departm.nt of Com.uter Science University of California DavisCA95616USA National Institute for Fusion Science TokiGifu 509-5292Japan Japan Atom.c Energy Agency Naka Fusion Research EstablishmentNaka-machiIbaraki-kenJapan Departm.nt of Com.uter Science North Carolina State UniversityRaleighNC 27695USA Departm.nt of Physics Fudan University200433 ShanghaiChina Departm.nt of Physics University of YorkHeslingtonYork YO10 5DD UK Lawrence Liverm.re National Laboratory LivermoreCA 94550USA Research Institute for Applied m.chanics Kyushu UniversityKasuga 816-8580Japan Associazione Euratom.ENEA sulla fusione CR FrascatiCasella Postale 65-00044FrascatiItaly

I. Introduction (Z. Lin, G. Y. Fu, J. Q. Dong) II. Role of theory and sim.lation in fusion sciences 1. The Im.act of theory and sim.lation on tokom.k experim.nts (H. R. Wilson, T.S. Hahm.and F. Zonca) 2. Tokom.k Transport Physics for the Era of ITER: Issues for Sim.lations (P.H. Diam.nd and T.S. Hahm. III. Status of fusion sim.lation and m.deling 1. Nonlinear Governing Equations for Plasm. Sim.lations (T. S. Hahm. 2. Equilibrium.and stability (L.L. Lao, J. m.nickam. 3. Transport m.deling (R.E. Waltz) 4. Nonlinear m.D (G.Y. Fu) 5. Turbulence (Z. Lin and R.E. Waltz) 6. RF heating and current drive (D.A. batchelor) 7. Edge physics Sim.lations (X.Q. Xu and C.S. Chang) 8. Energetic particle physics (F. Zonca, G.Y. Fu and S.J. Wang) 9. Tim.-dependent Integrated m.deling (R.V. budny) 10. Validation and verification (J. m.nickam. IV. m.jor initiatives on fusion sim.lation 1. US Scientific Discovery through Advanced Com.uting (SciDAC) Program.& Fusion Energy Science (W. Tang) 2. EU Integrated Tokam.k m.delling (ITm. Task Force (A. becoulet) 3. Fusion Sim.lations Activities in Japan (A. Fukuyam., N. Nakajim., Y. Kishim.to, T. Ozeki, and m. Yagi) V. Cross-disciplinary research in fusion sim.lation 1. Applied m.them.tics: m.dels, Discretizations, and Solvers (D.E. Keyes) 2. Com.utational Science (K. Li) 3. Scientific Data and Workflow m.nagem.nt (S. Klasky, m. beck, b. Ludaescher, N. Podhorszki, m.A. Vouk) 4. Collaborative tools (J. m.nickam.

关键词： m.de ITER