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长侧基甲壳型液晶高分子的合成及性质研究

高分子学报 2011年第11期21卷 1311-1319页

作者：梁小朝陈小芳 li christopher y. 沈志豪范星河周其凤北京分子科学国家实验室高分子化学与物理教育部重点实验室北京大学化学与分子工程学院北京100871 Department of Materials Science and Engineering Drexel University Philadelphia PA 19104

设计并合成了一系列尾链为不同长度烷氧基的长侧基甲壳型液晶高分子聚[2,5-二(4'-烷氧基联苯氧羰基)苯乙烯](PnCbiPCS,n=4,6,8,10,14).这些聚合物都具有良好的热稳定性.偏光显微镜及一维和二维广角X射线衍射等研究结果表明PnCbiPCS这一... 详细信息

设计并合成了一系列尾链为不同长度烷氧基的长侧基甲壳型液晶高分子聚[2,5-二(4'-烷氧基联苯氧羰基)苯乙烯](PnCbiPCS,n=4,6,8,10,14).这些聚合物都具有良好的热稳定性.偏光显微镜及一维和二维广角X射线衍射等研究结果表明PnCbiPCS这一系列聚合物均能形成稳定的近晶A相结构,所对应的层间距随末端尾链的增长而增加,当n=4,6时层间距与侧基的理论长度相同,n≧8时层间距小于理论值,形成部分穿插的近晶A相结构.在剪切力场作用下,所有这些聚合物所形成的近晶相均易发生宏观取向,近晶层法线方向与剪切方向垂直.

关键词：甲壳型液晶高分子长侧基近晶相

Compressive properties of a novel slurry.infiltrated fiber concrete reinforced with arc-shaped steel fibers

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Journal of Zhejiang University.Science A(Applied Phy.ics & Engineering) 2023年第6期24卷 543-556页

作者： Hedong li y.biao li y.nfeng PAN P.L.NG christopher K.y.LEUNG Xin ZHAO School of Civil Engineering and Architecture Zhejiang Sci-Tech UniversityHangzhou 310018China Department of Civil Engineering The University of Hong KongHong Kong 999077China Faculty.of Civil Engineering Vilnius Gediminas Technical UniversityVilnius LT-10223Lithuania Department of Civil and Environmental Engineering The Hong Kong University of Science and TechnologyHong Kong 999077China School of Civil Engineering and Architecture Zhejiang University of Science and TechnologyHangzhou 310023China

Slurry.infiltrated fiber concrete(SIFCON)is a sort of strain hardening cement-based composite material,ty.ically.made with 5%–20%steel *** study.focused on a novel ty.e of SIFCON in which hooked-end steel fibers were replaced by.arc-shaped steel *** quasi-static compressive properties of the SIFCON were first *** results suggested that using arc-shaped steel fibers in lieu of hooked-end steel fibers increased the quasi-static compressive strength by.47.1%and the strain at peak stress by.56.3%.We attribute these improvements to new crack-resisting mechanisms,namely.fiber crosslock”,“dual bridging”,and“confinement loops”,when the arc-shaped steel fibers are introduced into *** high impact resistance is a special property.of SIFCON that is of practical significance,the dy.amic compressive properties of arc-shaped steel fiber SIFCON were studied by.using an 80-mm-diameter split Hopkinson pressure bar(SHPB).The results showed that the dy.amic compressive strength,dy.amic increase factor(DIF),and dy.amic toughness of SIFCON all increased with the strain *** SIFCON incorporating arc-shaped steel fibers proved to have significant advantages in structural applications requiring high impact resistance.

关键词： Slurry.infiltrated fiber concrete(SIFCON) Arc-shaped steel fiber Quasi-static compressive properties Spilt Hopkinson pressure bar(SHPB) Dy.amic compressive properties

Clinical Peptidomics: Advances in Instrumentation, Analy.es, and Applications

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Biomedical Engineering Frontiers 2023年第1期4卷 116-132页

作者： lin li Jing Wu christopher JLy.n li Jiang Tony.y.Hu Center for Cellular and Molecular Diagnostics Department of Biochemistry and Molecular BiologySchool of MedicineTulane UniversityNew OrleansLAUSA Department of Laboratory.Medicine and Sichuan Provincial Key.Laboratory.for Human Disease Gene Study Sichuan Academy of Medical Sciences and Sichuan Provincial People’s HospitalChengduChina Department of Clinical Laboratory Third Central Hospital of TianjinTianjin Institute of Hepatobiliary DiseaseTianjin Key Laboratory of Artificial CellArtificial Cell Engineering Technology Research Center of Public Health MinistryTianjinChina Department of Biomedical Engineering School of Science and EngineeringTulane UniversityNew OrleansLAUSA

Extensive effort has been devoted to the discovery.development,and validation of biomarkers for early.disease diagnosis and prognosis as well as rapid evaluation of the response to therapeutic *** and transcriptomic profiling are well-established means to identify.disease-associated ***,analy.is of disease-associated peptidomes can also identify.novel peptide biomarkers or signatures that provide sensitive and specific diagnostic and prognostic information for specific malignant,chronic,and infectious *** evidence also suggests that peptidomic changes in liquid biopsies may.more effectively.detect changes in disease pathophy.iology.than other molecular *** gained from peptide-based diagnostic,therapeutic,and imaging approaches has led to promising new theranostic applications that can increase their bioavailability.in target tissues at reduced doses to decrease side effects and improve treatment ***,despite major advances,multiple factors can still affect the utility.of peptidomic *** review summarizes several remaining challenges that affect peptide biomarker discovery.and their use as diagnostics,with a focus on technological advances that can improve the detection,identification,and monitoring of peptide biomarkers for personalized medicine.

关键词： doses gained devoted

含树枝化以及线性侧链的超分子共聚物的液晶相结构调控

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高分子学报 2017年第10期27卷 1624-1632页

作者：郑梅青朱亚兰陈小芳 christopher y.li 苏州大学材料与化学化工学部苏州215123 Department of Materials Science and Engineering Drexel University

设计了一类由聚4-乙烯基吡啶(P4VP)、含弯曲树枝化分子12CBP以及线性分子PDP组成的三元共混体系,其中12CBP和PDP端基均为酚羟基,可与P4VP侧基的吡啶环上的N原子进行氢键复合.傅立叶变换红外光谱、示差扫描量热法、偏光显微镜、小角X射... 详细信息

设计了一类由聚4-乙烯基吡啶(P4VP)、含弯曲树枝化分子12CBP以及线性分子PDP组成的三元共混体系,其中12CBP和PDP端基均为酚羟基,可与P4VP侧基的吡啶环上的N原子进行氢键复合.傅立叶变换红外光谱、示差扫描量热法、偏光显微镜、小角X射线散射和原子力显微镜等多种研究表明该共混体系为均相体系,三组分自组装形成以P4VP为主链,12CBP和PDP为超分子侧链的"无规共聚物"P4VP(12CBP)x(PDP)y.x+y.1).该超分子侧链共聚物的聚集态结构与小分子12CBP和PDP相对含量有关.当12CBP含量x≥0.5时,体系组装形成六方柱状相结构,柱子的直径随着体系中12CBP含量减少而逐渐减小.当12CBP含量<0.5时,即使少量12CBP的引入也会引起体系层状相结构的破坏,体系表现为无定形状态.

关键词：超分子共聚物氢键侧链液晶聚合物六方柱状相

Extracellular vesicles:Emerging tools as therapeutic agent carriers

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Acta Pharmaceutica Sinica B 2022年第10期12卷 3822-3842页

作者： Shan liu Xue Wu Sutapa Chandra christopher Ly.n Bo Ning li jiang Jia Fan Tony.y.Hu Sichuan Provincial Key.Laboratory.for Human Disease Gene Study Department of Medical GeneticsDepartment of Laboratory MedicineSichuan Academy of Medical Sciences&Sichuan Provincial People’s HospitalChengdu 610072China Department of Biochemistry.and Molecular Biology Center for Cellular and Molecular DiagnosisSchool of MedicineTulane UniversityNew OrleansLA 70112USA The M.O.E.Key.Laboratory.of Laboratory.Medical Diagnostics the College of Laboratory MedicineChongqing Medical UniversityChongqing 400016China

Extracellular vesicles(EVs)are secreted by.both eukary.tes and prokary.tes,and are present in all biological fluids of vertebrates,where they.transfer DNA,RNA,proteins,lipids,and metabolites from donor to recipient cells in cell-to-cell *** EV components can also indicate the ty.e and biological status of their parent cells and serve as diagnostic targets for liquid *** can also natively.carry.or be modified to contain therapeutic agents(e.g.,nucleic acids,proteins,poly.accharides,and small molecules)by.phy.ical,chemical,or bioengineering *** to their excellent biocompatibility.and stability.EVs are ideal nanocarriers for bioactive ingredients to induce signal transduction,immunoregulation,or other therapeutic effects,which can be targeted to specific cell ***,we review EV classification,intercellular communication,isolation,and characterization strategies as they.apply.to EV *** review focuses on recent advances in EV applications as therapeutic carriers from in vitro research towards in vivo animal models and early.clinical applications,using representative examples in the fields of cancer chemotherapeutic drug,cancer vaccine,infectious disease vaccines,regenerative medicine and gene ***,we discuss current challenges for EV therapeutics and their future development.

关键词： Extracellular vesicle Therapeutic agent Delivery.carrier Outer membrane vesicle Cancer therapy Infectious disease vaccine Regenerative medicine Gene therapy

Impact of cash crop cultivation on household income and migration decisions:Evidence from low-income regions in China

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Journal of Integrative Agriculture 2020年第10期19卷 2571-2581页

作者： li Meng christopher GAN Wanglin MA Wei JIANG College of Economics Fujian Agriculture and Forestry UniversityFuzhou 350002P.R.China Department of Financial and Business Sy.tems Faculty of Agribusiness and CommerceLincoln UniversityLincoln 7647ChristchurchNew Zealand Department of Global Value Chains and Trade Faculty of Agribusiness and CommerceLincoln UniversityLincoln 7647ChristchurchNew Zealand Department of Ecosy.tem Science and Management Pennsylvania State UniversityPA 16801USA

This study.examines the impact of cash crop cultivation on household income and migration decisions,using survey.data collected from low-income regions in *** farmers decide themselves whether to cultivate cash crops,an endogenous treatment regression model that accounts for potential selection bias issue is used to analy.e the *** empirical results show that cash crop cultivation exerts a positive and statistically.significant impact on household income,but it does not affect household migration decisions *** disaggregated analy.es reveal that cash crop cultivation significantly.increases farm income but decreases off-farm income.

关键词： cash crop cultivation household income migration decisions endogenous treatment regression model

Structures and electronic properties of domain walls in Bi FeO3 thin films

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National Science Review 2019年第4期6卷 669-683页

作者： Huaixun Huy.n linze li christopher Addiego Wenpei Gao Xiaoqing Pan Department of Materials Science and Engineering University of CaliforniaIrvine Department of Phy.ics and Astronomy University of CaliforniaIrvine Irvine Materials Research Institute University of CaliforniaIrvine

Domain walls（DWs） in ferroelectrics are atomically.sharp and can be created, erased, and reconfigured within the same phy.ical volume of ferroelectric matrix by.external electric fields. They.possess a my.iad of novel properties and functionalities that are absent in the bulk of the domains, and thus could become an essential element in next-generation nanodevices based on ferroelectrics. The knowledge about the structure and properties of ferroelectric DWs not only.advances the fundamental understanding of ferroelectrics, but also provides guidance for the design of ferroelectric-based devices. In this article, we provide a review of structures and properties of DWs in one of the most widely.studied ferroelectric sy.tems, BiFeO3thin films. We correlate their conductivity.and photovoltaic properties to the atomic-scale structure and dy.amic behaviors of DWs.

关键词： domain wall BiFeO3 ferroelectric conductivity photovoltaics thin film

Novel theoretical constraints for color-octet scalar models

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Chinese Phy.ics C 2019年第9期43卷 1-11页

作者： li Cheng Otto Eberhardt christopher W.Murphy Institute of Applied Phy.ics and Computational Mathematics Beijing 100094China Instituto de Fisica Corpuscular Universitat de Valencia-CSICApt.Correus 22085E-46071 ValenciaSpain Department of Phy.ics Brookhaven National LaboratoryUptonNew York11973USA

We study.the theoretical constraints on a model whose scalar sector contains one color octet and one or two color singlet SU(2)L *** ensure unitarity.of the theory.we constrain the parameters of the scalar potential for the first time at the next-to-leading order in perturbation ***,we derive new conditions guaranteeing the stability.of the *** employ.the HEPfit package to extract viable parameter regions at the electroweak scale and test the stability.of the renormalization group evolution up to the multi-TeV ***,we set upper limits on the scalar mass *** results are given for both cases with and without a second scalar color singlet.

关键词： bey.nd the Standard Model extension of Higgs sector EW sy.metry breaking

Embry.nic and post-embry.nic responses to high-elevation hy.oxia in a low-elevation lizard

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Integrative Zoology 2020年第4期15卷 338-348页

作者： Xinghan li Pengfei WU liang MA christopher HUEBNER Baojun SUN Shuran li College of life and Environmental Science Wenzhou UniversityWenzhouChina Key.Laboratory.of Animal Ecology.and Conservation Biology Chinese Academy of SciencesInstitute of ZoologyBeijingChina University.of Chinese Academy.of Sciences BeijingChina Department of Integrative Biology University of CaliforniaBerkeleyCaliforniaUSA

Low-elevation species can migrate toward higher elevations to survive in a warming ***,animals’responses to hy.oxia when migrating to high elevations have rarely.been *** identify.the response of lowelevation lizards to high-elevation hy.oxia,we collected field body.temperatures(Tfb)and operative temperatures(Te)of lizards(Eremias argus)from a low-elevation population(1036 m)and a high-elevation population(2036 m),and then determined adult thermal phy.iology.embry.nic development,and hatchling phenoty.es after acclimating low-elevation lizards and incubating their eggs in conditions mimicking the low-elevation oxy.en condition(18.5%O2)and high-elevation oxy.en(hy.oxic)condition(16.5%O2).Our study.revealed that Tfb and Te were higher for the low-elevation population compared to the high-elevation *** also found adults from low elevation acclimated to hy.oxia preferred lower body.temperatures,but did not show changes in locomotor performance or *** addition,hy.oxia did not affect embry.nic development(hatching time and success)or hatchling phenoty.es(body.size and locomotor performance).These results suggest that adult lizards from low elevations can respond to hy.oxia-induced stress when migrating to high elevations by.behaviorally.thermoregulating to lower body.temperatures in order to sustain normal ***,low-elevation embry.s can develop normally.with unchanged hatching success and offspring phenoty.es)under the high-elevation hy.oxic *** study.highlights that low-elevation populations of a species that inhabits a range of elevations can buffer the impact of high-elevation hy.oxic conditions to some degree and thus attain similar fitness to the source population.

关键词： climate warming high elevation hy.oxia oviparous lizard thermal preference