检索结果-南通市图书馆

Stable NiO-CeO_(2) nanoparticles with improved carbon resistance for methane dry reforming

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2022年第1期40卷 57-62页

作者： Andrea Cárdenas-Arenas Esther Bailón-García Dolores Lozano-Castelló Patrick Da Costa Agustín Bueno-López Department of Inorganic Chemistry University of AlicanteCarretera de San Vicente s/nE03080AlicanteSpain Sorbonne Universite Institut Jean Le Rond d'AlembertCNRS UMR 71902 place de la gare de ceinture78210Saint Cyr L'EcoleFrance

High surface area mixed oxide 8.7%NiO-CeO_(2) nanoparticles(122 m2/g;6-7 nm)were prepared using a reversed microemulsion method,and were tested for dry methane reforming(DRM).The catalytic activity of these nanoparticles remains stable under the severe conditions of DRM(700℃),and they show better carbon resistance than conventional NiO-CeO_(2) catalysts prepared without control of the size.The activity and selectivity of nanoparticles and reference catalyst are similar,but nanoparticles reduce the accumulation of carbon by 63%during the DRM tests,which is a key feature for this reaction.XPS and H_(2)-TPR suggest that the improved carbon resistance of the nanoparticles is due to the better interaction and cooperation between NiO and CeO_(2) mixed phases.In nanoparticles,the participation of cerium cations in the redox processes taking place during DRM stabilizes cationic species of nickel.On the contrary,the catalyst prepared without control of the size suffers segregation of Ni during DRM reaction,and segregated Ni explains the higher catalytic formation of carbon.

关键词： Methane dry reforming Nickel Ceria Nanoparticle Rare earths

Exosomes as mediators of neuron-glia communication in neuroinflammation

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2020年第5期15卷 796-801页

作者： María Pascual Francesc Ibánez Consuelo Guerri Department of Molecular and Cellular Pathology of Alcohol Príncipe Felipe Research CenterValenciaSpain Department of Physiology School of Medicine and DentistryUniversity of ValenciaValenciaSpain

In recent years,a type of extracellular vesicles named exosomes has emerged that play an important role in intercellular communication under physiological and pathological conditions.These nanovesicles (30–150 nm) contain proteins,RNAs and lipids,and their internalization by bystander cells could alter their normal functions.This review focuses on recent knowledge about exosomes as messengers of neuron-glia communication and their participation in the physiological and pathological functions in the central nervous system.Special emphasis is placed on the role of exosomes under toxic or pathological stimuli within the brain,in which the glial exosomes containing inflammatory molecules are able to communicate with neurons and contribute to the pathogenesis of neuroinflammation and neurodegenerative disorders.Given the small size and characteristics of exosomes,they can cross the blood-brain barrier and be used as biomarkers and diagnosis for brain disorders and neuropathologies.Finally,although the application potential of exosome is still limited,current studies indicate that exosomes represent a promising strategy to gain pathogenic information to identify therapeutically targets and biomarkers for neurological disorders and neuroinflammation.

关键词： biomarkers exosomes glial cells neuroinflammation neuron-glia commuication neurons neuropathology therapy

Three-dimensional trees for virtual globes

在线全文

学校读者我要写书评

暂无评论

International Journal of Digital Earth 2014年第10期7卷 789-810页

作者： Cristina Rebollo Inmaculada Remolar Jesus Gumbau Miguel Chover Institute of New Imaging Technologies Universitat Jaume ICastellonSpain

One of the problems in virtual globes technologies is the real-time representation of vegetal species.In forest or garden representations,the low detailed plants produce a lack of realism.Efficient techniques are required to achieve accurate interactive visualisation due to the great number of polygons the vegetal species have.This article presents a multi-resolution model based on a geometric representation of vegetal species that allows the application to perform the progressive transmission of the model,that is,the transmission of a simple representation followed by successive refinements of it.It has a hardware-oriented design in order to obtain interactive frame rates.The geometric data of the objects are stored in the graphics processing unit and,moreover,the change from one approximation to another is obtained by performing mathematical calcula-tions in this graphics hardware.The multi-resolution model presented here enables instancing:as many vegetal species as desired can be rendered with different levels of detail,while all of them are accessing the same geometric data.This model has been used to build a real-time representation of a not imaginary scenario.

关键词： virtual globes real-time rendering vegetal species level of detail graphics hardware progressive transmission

miR-99a-5p modulates doxorubicin resistance via the COX-2/ABCG2 axis in triple-negative breast cancer: from the discovery to in vivo studies

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

Cancer Communications 2022年第12期42卷 1412-1416页

作者： Iris Garrido-Cano Anna Adam-Artigues Ana Lameirinhas Juan F.Blandez Vicente Candela-Noguera federico Rojo Sandra Zazo Juan Madoz-Gúrpide Ana Lluch Begoña Bermejo Felix Sancenón Juan Miguel Cejalvo Ramón Martínez-Mañez Pilar Eroles Biomedical Research Institute INCLIVA Valencia 46010Spain Bioengineering Biomaterials and Nanomedicine Networking Biomedical Research Centre(CIBER-BBN)Madrid 28029Spain Interuniversity Research Institute for Molecular Recognition and Technological Development(IDM) Polytechnic University of ValenciaUniversity of ValenciaValencia 46010Spain Joint Unit CIPF-UPV of Mechanisms of Diseases and Nanomedicine ValenciaPolytechnic University of ValenciaPrince Felipe Research CenterValencia 46012Spain Joint Research Unit in Nanomedicine and Sensors Polytechnic University of ValenciaMedical Research Institute Hospital La FeValencia 46026Spain Biomedical Research Networking Center in Oncology(CIBERONC) Madrid 28029Spain Department of Pathology Fundación Jiménez Díaz University Hospital Health Research InstituteMadrid 28040Spain Department of Clinical Oncology University Clinical Hospital of ValenciaValencia 46010Spain Department of Medicine University of ValenciaValencia 46010Spain Department of Physiology University of ValenciaValencia 46010Spain

Dear Editor,Breast cancer(BC)is the most commonly diagnosed cancer and the fifth cause of cancer-related death worldwide[1].Despite the advances in BC targeted therapies,cytotoxic chemotherapy is still widely used[2].However,around 20%-30%of BC patients develop metastasis after treatment as a consequence of drug resistance[3].In this context,microRNAs have emerged as potential therapeutic targets to overcome therapy resistance[4].Therefore,we aimed to elucidate the molecular mechanisms underlying resistance to doxorubicin,one of the most effective chemotherapeutic agents used in BC.Methods are detailed in Supplementary Materials.

关键词： doxorubicin ABCG2 chemotherapy

The ■_(s)^(0)→J/ψπ^(0)η decay and the a_(0)(980)-f_(0)(980) mixing

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

Chinese Physics C 2022年第8期46卷 122-127页

作者：李嘉婷林佳欣张功杰梁伟红 E.Oset Department of Physics Guangxi Normal UniversityGuilin 541004China Guangxi Key Laboratory of Nuclear Physics and Technology Guangxi Normal UniversityGuilin 541004China Departamento de Física Teórica and IFIC Centro Mixto Universidad de Valencia-CSIC Institutos de Investigación de PaternaAptdo.2208546071 ValenciaSpain

We study the ■_(s)^(0)→J/ψf_(0)(980) and ■_(s)^(0)→J/ψa_(0)(980) reactions,and pay attention to the different sources of iso spin violation and mixing of f_(0)(980) and a_(0)(980) resonances where these resonances are dynamically generated from meson-meson interactions.We find that the main cause of isospin violation is isospin breaking in the meson-meson transition T matrices,and the other source is that the loops involving kaons in the production mechanism do not cancel due to the different masses of charged and neutral kaons.We obtain a branching ratio for a_(0)(980)production of the order of 5×10^(-6).Future experiments can address this problem,and the production rate and shape of the π^(0)η mass distribution will definitely help to better understand the nature of scalar resonances.

关键词： strange B meson decay isospin violation a_(0)(980)–f_(0)(980)mixing hadronic structure

Repercussion of the a_(0)(1710)[a_(0)(1817)]resonance and future developments

在线全文

学校读者我要写书评

暂无评论

Science Bulletin 2023年第3期68卷 243-246页

作者： Eulogio Oset Lian-Rong Dai Li-Sheng Geng Departamento de Física Teórica and IFIC Centro Mixto Universidad de Valencia-CSIC Institutos de Investigación de PaternaValencia 46071Spain School of Science Huzhou UniversityHuzhou 313000China School of Physics Beihang UniversityBeijing 102206China

In a recent paper[1],the BESIII Collaboration reported the observation of a scalar meson of spin-parity J^(P)=0^(+)with isospin I¼1,branded as a_(0)(1817).The state is seen as a peak in the K0 SKþmass distribution in ... 详细信息

关键词： 0 1 decay

Ξbb and Ωbbb molecular states

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2020年第6期44卷 87-94页

作者： J.M.Dias 余圻昕梁伟红孙志峰谢聚军 E.Oset Department of physics guangxi normal universityguilin 541004china instituto de física universidade de são paulorua do matão 1371.butantãcep 05508-090são paulosão paulobrazil institute for experimental physics department of physicsuniversity of hamburgluruper chaussee 149d-22761 hamburggermany guangxi key laboratory of nuclear physics and technology guangxi normal universityguilin 541004china school of physical science and technology lanzhou universitylanzhou 730000china institute of modern physics chinese academy of scienceslanzhou 730000china school of physics and microelectronics zhengzhou universityzhengzhou 450001china school of nuclear science and technology university of chinese academy of sciencesbeijing 100049china departamento de física teórica and ific centro mixto universidad de valencia-csic institutos de investigación de paternaaptdo.2208546071 valenciaspain

Using the vector exchange interaction in the local hidden gauge approach,which in the light quark sector generates the chiral Lagrangians and has produced realistic results for Ωc,Ξc,Ξb and the hidden charm pentaquark states,we study the meson-baryon interactions in the coupled channels that lead to the Ξbb and Ωbbb excited states of the molecular type.We obtain seven states of the Ξbb type with energies between 10408 and 10869 MeV,and one Ωbbb state at 15212 MeV.

关键词： doubly-heavy baryons strong interaction molecular state

Role of hyperfine mixing in b→c semileptonic decays of doubly-heavy baryons

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2010年第9期34卷 1488-1490页

作者： C.Albertus E.Hernández J.Nieves Departamento de Física Fundamental e IUFFyM Universidad de Salamanca Instituto de Física Corpuscular (IFIC) Centro Mixto CSIC-Universidad de ValenciaInstitutos de Investigación de Paterna

We analyze the effects of hyperfine mixing in b → c semileptonic decays of doubly heavy baryons.We qualitatively confirm the results by W.Roberts and M.Pervin in Int.J.Mod.Phys.A,2009,24： 2401– 2413,finding that mixing has a great impact on those transitions.However,predictions without mixing differ by a factor of 2 and this discrepancy translates to the mixed case where large differences in decay widths are observed between the two calculations.

关键词： doubly-heavy baryons semileptonic decay hyperfine mixing

The radiative decay D^(0)→ K^(*0)γ with vector meson dominance

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2018年第4期42卷 135-141页

作者： J.M.Dias V.R.Debastiani 谢聚军 E.Oset Institute of Modern Physics Chinese Academy of Sciences Departamento de Fisica Teorica and IFIC Centro Mixto Universidad de Valencia-CSICInstitutos de Investigacion de Paterna Instituto de Fisica Universidade de Sao Paulo

Motivated by the experimental measurements of D0 radiative decay modes, we have proposed a model to study the D0→ K＊0γ decay, by establishing a link with D0→ K＊0V （V=ρ0, ω） decays through the vector meson dominance hypothesis. In order to do this properly, we have used the Lagrangians from the local hidden gauge symmetry approach to account for Vγ conversion. As a result, we have found the branching ratio B[D0→ K＊0γ]=（1.55-3.44）×10-4, which is in fair agreement with the experimental values reported by the Belle and BaBar collaborations.

关键词： radiative decay vector meson dominance local hidden gauge symmetry