检索结果-南通市图书馆

Rational m.lecular design of.ef.icient yellow-red dendrim.r TADf.f.r solution-processed OLEDs: a com.ined ef.ect of.substitution posi.i.n and strength of.the donors

在线全文

学校读者我要写书评

暂无评论

Science China Chem.stry 2024年第5期67卷 1613-1623页

作者： Changf.ng si Dianm.ng Sun Tom.s m.tulaitis David B.Cordes Alexandra m.Z.Slawin Eli Zysm.n-Colm.n Organic Sem.conductor Centre EaStCHEM School of ChemistryUniversity of St AndrewsSt AndrewsKY169STUK

The developm.nt of.high-perf.rm.nce solution-processed red organic light-em.tting diodes(OLEDs) rem.ins a challenge,particularly in term. of.m.intaining ef.iciency at high lum.nance. Here, we designed and synthesized f.ur novel orange-red therm.lly activated delayed f.uorescence(TADf. dendrim.rs that are solution-processable: 2GCz BP, 2DPACz BP, 2f.P2GCz and 2f.P2DPACz. We system.tically investigated the ef.ect of.substitution posi.i.n and strength of.donors on the optoelectronic properties. The reverse intersystem.crossing rate constant(kRiSC) of.the em.tters having donors substituted at posi.i.ns 11and 12 of.the dibenzo[a,c]phenazine(BP) is m.re than 10-tim.s f.ster than that of.com.ounds substituted having donors substituted at posi.i.ns 3 and 6. Com.ound 2DPACz BP, containing stronger donors than 2GCz BP, exhibits a red-shif.ed em.ssion and sm.ller singlet-triplet energy splitting, ΔE_(ST), of.0.01 e V. The solution-processed OLED with 10 wt% 2DPACz BP doped in m.CP em.tted at 640 nm.and showed a m.xim.m.external quantum.ef.iciency(EQE_(m.x)) of.7.8%, which was ef.ectively m.intained out to a lum.nance of.1,000 cd m.2. Such a device's perf.rm.nce at relevant display lum.nance is am.ng the highest f.r solution-processed red TADf.OLEDs. The ef.iciency of.the devices was im.roved signif.cantly by using 4Cz iPN as an assistant dopant in a hyperf.uorescence(Hf. conf.guration, where the 2DPACz BP Hf.device shows an EQEm.xof.20.0% at λEL of.605 nm.and rem.ins high at 11.8% at a lum.nance of.1,000 cd m.2, which m.kes this device one of.the highest ef.iciency orange-to-red Hf.SP-OLEDs to date.

关键词： therm.lly activated delayed f.uorescence solution-processing red OLEDs dibenzo[a,c]phenazine dendrim.rs

Synthesis of.photostable near-inf.ared sulf.ne-rhodam.nes f.r photoacoustic im.ging-guided phototherm.l therapy

在线全文

学校读者我要写书评

暂无评论

Chinese Chem.cal Letters 2024年第3期35卷 369-372页

作者： Huiyu si Dongjuan Wang Xianf. Du Xin Zhou Departm.nt of.Chem.stry College of Chemistry and Chemical EngineeringQingdao UniversityQingdao 266071China Departm.nt of.Orthopedics the Affiliated Hospital of Qingdao UniversityQingdao 266071China

Phototherm.l therapy(PTT)is a cutting-edge cancer treatm.nt that can kill cancer cells in hypoxic environm.nts without relying on *** of.the ideal phototherm.l agents with a high absorption coef.icient in the near-inf.ared region,and a high excellent phototherm.l conversion ef.iciency is of.great ***-Rhodanm.ne dye has showed an im.ressive absorption wavelength over 700 nm.but suf.ered f.om.a stability *** this study,we synthesized f.ve sulf.ne rhodam.nes and investigated the substitution ef.ects on ***_(2)R2 showed high stability and strong absorbance at 714 nm.with an excellent phototherm.l conversion ef.iciency of.53.06%,m.king it suitable f.r accurate photoacoustic im.ging-guided phototherm.l therapy in vivo.

关键词： Phototherm.l therapy Sulf.ne rhodam.ne Near-inf.ared Photoacoustic im.ging

Ram.ey Num.ers of.Trees Versus m.ltiple Copies of.Books

在线全文

学校读者我要写书评

暂无评论

Acta m.them.ticae Applicatae si.i.a 2024年第3期40卷 600-612页

作者： Xiao-bing GUO si-nan HU Yue-jian PENG School of.m.them.tical Sciences Luoyang Normal UniversityLuoyang 471934China School of.m.them.tics Hunan UniversityChangsha 410082China

Given two graphs G and H,the Ram.ey num.er R(G,H) is the m.nim.m.integer N such that any two-coloring of.the edges of.K_(N) in red or blue yields a red G or a blue *** v(G) be the num.er of.vertices of.G and χ(G) be the chrom.tic num.er of.*** s(G) denote the chrom.tic surplus of.G,the num.er of.vertices in a m.nim.m.color class am.ng all proper χ(G)-colorings of.*** showed that R(G,H)≥(v(G)-1)(χ(H)-1)+s(H) if.G is connected and v(G)≥s(H).A connected graph G is H-good if.R(G,H)=(v(G)-1)(χ(H)-1)+s(H).Let tH denote the disjoint union of.t copies of.graph H,and let G∨H denote the join of.G and *** a com.lete graph on n vertices by K_(n),and a tree on n vertices by T_(n).Denote a book with n pages by B_(n),i.e.,the join K_(2) ∨■.Erd?s,f.udree,Rousseau and Schelp proved that T_(n) is B_(m.-good if.n≥*** this paper,we obtain the exact Ram.ey num.er of.T_(n) versus 2B_(2).Our result im.lies that T_(n) is 2B_(2)-good if.n≥5.

关键词： ram.ey num.er ram.ey goodness tree book

Cyclic-acyclic m.nom.rs m.tathesis polym.rization to access photodegradable polydicyclopentadiene and polyethylene-like m.terials

在线全文

学校读者我要写书评

暂无评论

Science China Chem.stry 2024年第4期67卷 1311-1315页

作者： Wu Li Daohong Liao Yougui Li Guif. si Changle Chen School of.Chem.stry and Chem.cal Engineering Hefei University of TechnologyHefei 230009China Key Laboratory of.Precision and intelligent Chem.stry Department of Polymer Science and EngineeringUniversity of Science and Technology of ChinaHefei 230026China

The developm.nt of.degradable and recyclable polym.rs is an attractive strategy to tackle the post-consum.tion pollution issue of.com.ercial ***-acyclic m.nom.rs m.tathesis polym.rization(CAm.P)has been recently reported to produce degradable therm.set,therm.plastic and elastom.ric polym.rs,and their degradability is enabled with addition of.various *** this contribution,we dem.nstrate that the utilization of.diene com.nom.rs containing photodegradable m.iety can give access to therm.set and therm.plastic m.terials bearing photo-degradation *** copolym.rization of.a series easily accessible diene com.nom.rs bearing photodegradable ortho-nitrobenzyl m.ieties with dicyclopentadiene(DCPD)or cyclooctene(COE)leads to the f.rm.tion of.photodegradable p DCPD therm.sets and p COE therm.plastic polym.rs with m.chanical properties com.arable to their non-degradable *** im.ortantly,their photo-degradation properties can be ef.iciently tuned with the addition of.ultraviolet absorber during in-situ polym.rization.

关键词： m.tathesis polym.rization photodegradable polydicyclopentadiene polyethylene-like m.terials

Ef.icacy and saf.ty of.Yangxinshi tablet f.r chronic heart f.ilure:A system.tic review and m.ta-analysis

在线全文

学校读者我要写书评

暂无评论

World Journal of.Clinical Cases 2024年第13期12卷 2218-2230页

作者： Sheng-Hua Lu Yun-f.ng Yu si-si Dai Ya-Qi Hu Jian-He Liu The f.rst Clinical College of.Chinese m.dicine Hunan University of Chinese MedicineChangsha 410007Hunan ProvinceChina Branch of.National Clinical Research Center f.r Chinese m.dicine Cardiology The First Hospital of Hunan University of Chinese MedicineChangsha 410007Hunan ProvinceChina

BACKGROUND The specif.c benef.ts of.Yangxinshi tablet(YXST)in the treating chronic heart f.ilure(CHf.rem.in *** To system.tically evaluate the ef.icacy and saf.ty of.YXST in the treatm.nt of.*** Random.zed controlled trials(RCTs)investigating YXST f.r CHf.treatm.nt were retrieved f.om.eight public databases up to Novem.er ***-analyses of.the included clinical studies were conducted using Review m.nager *** Twenty RCTs and 1845 patients were *** m.ta-analysis results showed that the YXST com.ination group,com.ared to the conventional drug group,signif.cantly increased the clinical ef.icacy rate by 23%[relative risk(RR)=1.23,95%Ci:1.17-1.29],(Pf. ventricular ejection f.action by 6.69%[m.an dif.erence(m.)=6.69,95%Ci:4.42-8.95,Pm.n walk test by 49.82 m.m.=49.82,95%C:38.84-60.80,Pm.nal pro-Btype natriuretic peptide by 1.03 ng/L[standardized m.(Sm.)=-1.03,95%Ci:-1.32 to-0.74,Pin natriuretic peptide by 80.95 ng/L(m.=-80.95,95%Ci:-143.31 to-18.59,P=0.01),lef. ventricular end-diastolic diam.ter by 3.92 m.(m.=-3.92,95%Ci:-5.06 to-2.78,Pf. ventricular endsystolic diam.ter by 4.34 m.(m.=-4.34,95%Ci:-6.22 to-2.47,Ping saf.ty,neither group reported any serious adverse events during treatm.nt(RR=0.54,95%Ci:0.15-1.90,P=0.33).in addition,Egger's test results indicated no signif.cant publication bias(P=0.557).CONCLUsiON YXST ef.ectively im.roves clinical sym.tom. and cardiac f.nction in patients with CHf.while m.intaining a f.vorable saf.ty prof.le,suggesting its potential as a therapeutic strategy f.r CHf.

关键词： Yangxinshi tablet Chronic heart f.ilure Cardiac f.nction System.tic evaluation m.ta-analysis

Wettability Gradient-induced Diode:m.ene-Engineered m.m.rane f.r Passive-Evaporative Cooling

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

Nano-m.cro Letters 2024年第8期16卷 382-397页

作者： Leqi Lei Shuo m.ng Yif.n si Shuo Shi Hanbai Wu Jieqiong Yang Jinlian Hu Departm.nt of.Biom.dical Engineering City University of Hong KongHong Kong S.A.R 999077China

Therm.regulatory textiles,leveraging high-em.ssi.i.y structural m.terials,have arisen as a prom.sing candidate f.r personal cooling m.nagem.nt;however,their advancem.nt has been hindered by the underperf.rm.d water m.isture transportation capacity,which im.acts on their therm.physiological ***,we designed a wettability-gradient-induced-diode(WGiD)m.m.rane achieving by m.ene-engineered electrospun technology,which could f.cilitate heat dissipation and m.isture-wicking *** a result,the obtained WGiD m.m.rane could obtain a cooling tem.erature of.1.5℃ in the“dry”state,and 7.1℃ in the“wet”state,which was ascribed to its high em.ssi.i.y of.96.40%in the m.R range,superior therm.l conductivity of.0.3349 W m.(-1) K^(-1)(based on radiation-and conduction-controlled m.chanism.),and unidirectional m.isture transportation *** proposed design of.ers an approach f.r m.ticulously engineering electrospun m.m.ranes with enhanced heat dissipation and m.isture transportation,thereby paving the way f.r developing m.re ef.icient and com.1}rtable therm.regulatory textiles in a high-hum.dity m.croenvironm.nt.

关键词： Passive-evaporative cooling m.ene Electrospun m.m.rane Wettability gradient Diode

Determ.nistic processes drive turnover-dom.nated beta diversity of.breeding birds along the central Him.layan elevation gradient

在线全文

学校读者我要写书评

暂无评论

Avian Research 2024年第2期15卷 163-171页

作者： Zhif.ng Ding Jianchao Liang Le Yang Cong Wei Huijian Hu Xingf.ng si Guangdong Key Laboratory of.Anim.l Conservation and Resource Utilization Institute of ZoologyGuangdong Academy of SciencesGuangzhouGuangdong510260China Tibet Plateau institute of.Biology Lhasa850001China Zhejiang Zhoushan island Ecosystem.Observation and Research Station Institute of Eco-ChongmingZhejiang Tiantong Forest Ecosystem National Observation and Research StationSchool of Ecological and Environmental SciencesEast China Normal UniversityShanghai200241China

Beta diversity,the variation of.com.unity com.osi.i.n am.ng sites,bridges alpha and gam.a diversity and can reveal the m.chanism. of.com.unity assem.ly through applying distance-decay m.dels and/or partitioning beta diversity into turnover and nestedness com.onents f.om.f.nctional and phylogenetic *** as the m.st natural experim.nt system.provide good opportunities f.r exploring beta diversity patterns and the underlying ecological ***,we sim.ltaneously consider distance-decay m.dels and m.ltiple di-m.nsions of.beta diversity to exam.ne spatial variations of.bird com.unities,and to evaluate the relative im.ortance of.niche-based and neutral com.unity assem.ly m.chanism. along a 3600-m.elevational gradient in the central Him.layas,*** results showed that species turnover dom.nates taxonom.c,f.nctional,and phylogenetic beta *** observed strongest evidence of.spatial distance decays in taxonom.c si.i.arities of.birds,f.llowed by its phylogenetic and f.nctional *** com.onent was highest in taxonom.c beta diversity,while nestedness com.onent was highest in f.nctional beta ***,all correlations of.assem.lage si.i.arity with clim.tic distance were higher than that with spatial *** values of.overall taxonom.c,f.nctional,and phylogenetic beta diversity and their turnover com.onents increase with increasing elevational distance,while the standardized values of.taxonom.c and phylogenetic nestedness decreased with increasing elevational *** results highlighted the niche-based determ.nistic processes in shaping elevational bird diversity patterns that were determ.ned by the relative roles of.decreasing trend of.environm.ntal f.ltering and increasing trend of.lim.ting si.i.arity along elevation distances.

关键词： Beta diversity Bird Com.unity assem.ly f.nctional trait Him.laya Nestedenss Phylogenetic distance Turnover

Laboratory and f.eld evaluation of.a low-cost optical particle sizer

在线全文

学校读者我要写书评

暂无评论

Journal of.Environm.ntal Sciences 2024年第8期142卷 215-225页

作者： m.ngzhen Tang Yicheng Shen Yanzhen Ge Jian Gao Chong Wang Liqing Wu Shuchun si State Key Laboratory of.Environm.ntal Criteria and Risk Assessm.nt Chinese Research Academy of Environmental SciencesBeijing 100012China Jinan Grid-Based Supervision Center of.Ecological and Environm.ntal Protection Jinan 250100China Tai’an Ecological Environm.nt Protection Control Center Tai’an 271000China School of.Physics Shandong UniversityJinan 250013China

Low-cost sensors are widely used to collect high-spatial-resolution particulate m.tter data that traditional ref.rence m.nitoring devices *** addition to the m.ss concentration,the num.er concentration and size distribution are also f.ndam.ntal in determ.ning the origin and hazard level of.particulate ***,low-cost optical sensors have been im.roved to establish optical particle sizers(OPSs).in this study,a low-cost OPS,the Nova SDS029,is introduced,and it is evaluated in com.arison to two ref.rence instrum.nts—the GRim. 11-D and the Tsi *** f.rst tested the si.i.g accuracy using polystyrene latex ***,we assessed the m.ss and num.er size distribution accuracy in three application scenarios:indoor sm.king,am.ient air quality,and m.bile *** evaluations suggest that the low-cost SDS029 rivals research-grade optical sizers in m.ny *** exam.le,(1)the particle diam.ters obtained with the SDS029 are close to the ref.rence instrum.nts(usuallyin the 0.3-5μm.range;(2)the num.er of.particles and m.ss concentration are highly correlated(r≥0.99)with the values obtained with the ref.rence instrum.nts;and(3)the SDS029 slightly underestim.tes the num.er concentration,but the derived Pm.(2.5)values are closer to m.nitoring station than the ref.rence *** successf.l application of.the SDS029 in m.ltiple scenarios suggests that a plausible particle size distribution can be obtained in an easy and cost-ef.icient *** believe that low-cost OPSs will increasingly be used to m.p the sources and risk levels of.particles at the city scale.

关键词： Optical particle sizer Particle size distribution Low-cost sensor Evaluation f.eld application

Superatom.assem.led boranes,carboranes,and low-dim.nsional boron nanom.terials based on arom.tic icosahedral B_(12)and C_(2)B_(10)

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第7期17卷 6734-6740页

作者： Qiao-Qiao Yan Yan-f.ng Wei Qiang Chen Yue-Wen m. si-Dian Li institute of.m.lecular Science Shanxi UniversityTaiyuan 030006China

Using the experim.ntally known arom.tic icosahedral superatom. i_(h)B_(12)H_(12)2−and D_(5d)1,12-C_(2)B_(10)H_(12)as building blocks and based on extensive density f.nctional theory calculations,we predict herein a series of.core–shell superpolyhedral boranes and carboranes in a bottom.up approach,including the high-sym.etry Th B_(12)@B_(152)H_(72)2−(2),C2h C_(2)B_(10)@B_(152)H_(72)(3),D_(3d)B_(12)@B_(144)H_(66)(4),i_(h)B_(12)@C_(24)B_(12)0H_(72)2−(6),and D_(5d)C_(2)B_(10)@C_(24)B_(12)0H_(72)(7).m.re interestingly,the superatom.assem.led linear D2h B_(36)H_(32)^(2−)(8),close-packed planar D_(3d)B_(84)H_(60)^(2−)(10),and nearly close-packed core−shell D_(3d)B_(12)@B144H_(6)6(4)can be extended periodically to f.rm.the one-dim.nsional(1D)α-rhom.ohedral borane nanowire B_(12)H_(10)(Pm.m.(9),two-dim.nsional(2D)α-rhom.ohedral m.nolayer borophane B_(12)H_(6)(P m.)(11),and the experim.ntally known three-dim.nsional(3D)α-rhom.ohedral boron(R m.(12)which can be viewed as an assem.ly of.the m.nolayer B_(12)H_(6)(11)staggered in vertical direction,setting up a bottom.up strategy to f.rm.low-dim.nsional boron-based nanom.terials f.om.their borane“seeds”via partial or com.lete *** bonding analyses indicate that the high stability of.these nanostructures originates f.om.the spherical arom.ticity of.their icosahedral B_(12)or C_(2)B_(10)structural units which possess the universal skeleton electronic conf.guration of.1S21P61D101f. f.llowing the Wade’s n+1 *** inf.ared(iR)and Ram.n spectra of.the m.st-concerned neutral B_(12)@B144H_(6)6(4)and C_(2)B_(10)@C_(24)B_(12)0H_(72)(7)are com.utationally sim.lated to f.cilitate their experim.ntal characterizations.

关键词： superatom.assem.ling bottom.up approach density f.nctional theory superpolyhedral boranes superpolyhedral carboranes borophanes