检索结果-南通市图书馆

Exploring the Cation Regulation Mechanism for Interfacial Water Involved in the hydrogen Evolution Reaction by In Situ Raman Spectroscopy

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-Micro Letters 2024年第3期16卷 303-312页

作者： Xueqiu You Dongao Zhang Xia‑Guang Zhang Xiangyu Li jing‑hua Tian Yao‑hui wang jian‑Feng Li School of Ocean Information Engineering Fujian Provincial Key Laboratory of Oceanic Information Perception and Intelligent ProcessingJimei UniversityXiamen 361021People’s Republic of China State Key Laboratory of Physical Chemistry of Solid Surfaces MOE Key Laboratory of Spectrochemical Analysis and InstrumentationiChEMCollege of Chemistry and Chemical EngineeringCollege of MaterialsCollege of EnergyXiamen UniversityXiamen 361005People’s Republic of China Key Laboratory of Green Chemical Media and Reactions Ministry of EducationCollaborative Innovation Center of Henan Province for Green Manufacturing of Fine ChemicalsCollege of Chemistry and Chemical EngineeringHenan Normal UniversityXinxiang 453007People’s Republic of China Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IKKEM) Xiamen 361005People’s Republic of China

Interfacial water molecules are the most important participants in the hydrogen evolution reaction(hER).hence,understanding the behavior and role that interfacial water plays will ultimately reveal the hER mechanism.Unfortunately,investigating interfacial water is extremely challenging owing to the interference caused by bulk water molecules and complexity of the interfacial environment.here,the behaviors of interfacial water in different cationic electrolytes on Pd surfaces were investigated by the electrochemistry,in situ core-shell nanostructure enhanced Raman spectroscopy and theoretical simulation techniques.Direct spectral evidence reveals a red shift in the frequency and a decrease in the intensity of interfacial water as the potential is shifted in the positively direction.When comparing the different cation electrolyte systems at a given potential,the frequency of the interfacial water peak increases in the specified order:Li+he structure of interfacial water was optimized by adjusting the radius,valence,and concentration of cation to form the two-h down structure.This unique interfacial water structure will improve the charge transfer efficiency between the water and electrode further enhancing the hER performance.Therefore,local cation tuning strategies can be used to improve the hER performance by optimizing the interfacial water structure.

关键词： In situ Raman Interfacial water hydrogen evolution reaction Cations

ThE SEEPAGE ChARACTERISTICS OF hETEROGENEOUS BODY WITh DIFFERENT SPREADING SOLUTION MODES AND ITS APPLICATIONS

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2007年第5期20卷 363-372页

作者： h.j. wang A.X. Wu X.S. Chen j. Zhang Civil ＆ Environment Engineering School University of Science and Technology Beijing Beijing 100083 China School of Resources and Safety Engineering Central South University Changsha 410083 China

As the dump was a typically heterogeneous body, the seepage was different with varied spreading solution modes. The phenomenon of lamination that occured in the site was simulated using three layers in an indoor experiment, and the seepage effect comparison experiment of the inside spreading solution model and the top spreading solution model have been carried out. In the inside spreading solution mode, the phreatic planar flew without infiltration and the parallel layer motion model was used to calculate the seepage coefficient and equivalent seepage coefficient of each state respectively. In the top spreading solution model, the phreatic planar flew with an even infiltration on the surface, and the vertical layer motion model was adopted to calculate the above coefficient. The results showed that the seepage coefficient of the inside model was larger than the top model in the heterogeneous body, The ratio of them was between 1.42 and 3.07. On the basis of these results, the following new technologies were discussed： installing a few small diameter mechanical pore sand piles with every lamination in the using dump; drilling some holes one-off in the unused dump. These two methods could changed the top spreading solution into the inside model, thus the seepage in the dump was improved.

关键词： heterogeneous body top spreading solution inside spreading solution sand pile drawing-injection drill

Optimization on magnetic properties of Nd-doped Fe_(3)O_(4) nanoparticles for magnetic shielding fabrics

在线全文

学校读者我要写书评

暂无评论

journal of Rare Earths 2024年第4期42卷 683-689页

作者： Xiaolei Song Congzhu Xu Yuyan wang huizhen Ke Yonggui Li Qufu Wei Xinqun Feng Faculty of Clothing and Design Minjiang UniversityFuzhou350108China Fujian Key Laboratory of Novel Functional Textile Fibers and Materials Minjiang UniversityFuzhou350108China College of Textile and Clothing Jiangnan UniversityWuxi214122China College of Fashion and Design Donghua UniversityShanghai201620China

high magnetic protective fabrics with rare earth Nd doped Fe_(3)O_(4) nanoparticles were fabricated via a grafting method.The structure,crystal form,and elemental composition of nanoparticles were investigated by transmission electron microscopy,energy dispersive X-ray,X-ray powder diffraction,and X-ray photoelectron spectroscopy.The obtained NdFe_(2)O_(4) nanoparticles show spherical shape with fine dispersion and reasonable element composition.however,they demonstrate fine superparamagnetic properties with a magnetic saturation value of 29.25 A·m^(2)/g and low coercivity of 1.902 mT through the vibrating sample magnetometry technique,which can be well developed in magnetic shielding protective applications.Then,the cotton fabrics with plain weave were finished by a proofing rapier loom as a carrier.The NdFe_(2)O_(4) nanoparticles underwent some appropriate surface modification and then were grafted onto the cotton fabrics by a bridge agent of N,N’-dissuccinimidyl carbonate.The morphology,structure,dispersion effect,and electromagnetic protective properties of the fabrics were observed through scanning electron microscopy,Fourier infrared spectroscopy,thermogravimetric analysisdifferential scanning calorimetry(TG-DSC),and a vector network analyzer.The reliable fabrics with grafting reaction on the interface are expected to have potential applications in the field of electromagnetic protection and biomedicine fields.

关键词： Magnetic property Nd Fe_(3)O_(4)nanoparticles Magnetic shielding Fabrics Rare earths

Exceptional mechanical performance and macroscale superlubricity enabled by core-shell-like MoS2/B4C film

在线全文

学校读者我要写书评

暂无评论

Science China Technological Sciences 2024年第7期67卷 2018-2030页

作者： REN SiMing GAO ZhenRong FAN Xin wang haiXin wang LiPing Key Laboratory of Advanced Marine Materials Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences

Molybdenum disulfide（MoS2） films are widely deployed in industrial applications owing to their inherent interlayer slip characteristics, offering energy consumption savings and prolonged mechanical part performance. Nevertheless, their practical utility is limited by environmental constraints and the limitations of preparation techniques, which hinder the attainment of robust superlubricity（friction coefficient herein, through magnetron sputtering technology, we synthesize a core-shell-like nanocomposite composed of MoS2nanosheets encapsulating B4C. The core-shell-like structure enables the resulting films to preferentially grow crystalline MoS2, providing them with outstanding mechanical properties and efficient lubrication over a wide range of temperatures. Remarkably, such film achieves robust macroscale superlubricity and an ultralow wear rate(1.7 ×10-8mm3N-1m-1) under high contact stress in a mild vacuum environment. This noteworthy outcome is primarily attributable to the self-segmentation of the macroscale contact interface during the friction process, involving:（1） a large amount of wear debris is embedded into the wear track to create extensive micro-sized asperities;（2） a nanolayer of amorphous carbon enriched with oxide nanoparticles is formed on the uppermost part of these asperities;（3） numerous incommensurate nanocontacts comprising nanoparticles and highly oriented MoS2nanosheets are established, culminating in the achievement of robust superlubricity. Our pioneering design, coupled with the elucidation of the underlying superlubricity mechanism, holds significant promise for advancing the development of robust and high-performance lubricants.

关键词： MoS2/B4C nanocomposites core-shell-like structure h/E ratio high-temperature friction macroscale superlubricity

Progression from ductal carcinoma in situ to invasive breast cancer:molecular features and clinical significance

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Signal Transduction and Targeted Therapy 2024年第5期9卷 1841-1868页

作者： jing wang Baizhou Li Meng Luo jia huang Kun Zhang Shu Zheng Suzhan Zhang jiaojiao Zhou The Key Laboratory of Cancer Prevention and Intervention China National Ministry of Educationthe Second Affiliated HospitalZhejiang University School of MedicineHangzhouChina Department of Breast Surgery and Oncology the Second Affiliated HospitalZhejiang University School of MedicineHangzhouChina Zhejiang Provincial Clinical Research Center for Cancer HangzhouChina Department of Pathology the Fourth Affiliated HospitalZhejiang University School of MedicineYiwuChina Department of Plastic Surgery the Second Affiliated HospitalZhejiang University School of MedicineHangzhouChina Cancer Center Zhejiang UniversityHangzhouChina

Ductal carcinoma in situ(DCIS)represents pre-invasive breast carcinoma.In untreated cases,25-60%DCIS progress to invasive ductal carcinoma(IDC).The challenge lies in distinguishing between non-progressive and progressive DCIS,often resulting in over-or under-treatment in many cases.With increasing screen-detected DCIS in these years,the nature of DCIS has aroused worldwide attention.A deeper understanding of the biological nature of DCIS and the molecular journey of the DCIS-IDC transition is crucial for more effective clinical management.here,we reviewed the key signaling pathways in breast cancer that may contribute to DCIS initiation and progression.We also explored the molecular features of DCIS and IDC,shedding light on the progression of DCIS through both inherent changes within tumor cells and alterations in the tumor microenvironment.In addition,valuable research tools utilized in studying DCIS including preclinical models and newer advanced technologies such as single-cell sequencing,spatial transcriptomics and artificial intelligence,have been systematically summarized.Further,we thoroughly discussed the clinical advancements in DCIS and IDC,including prognostic biomarkers and clinical managements,with the aim of facilitating more personalized treatment strategies in the future.Research on DCIS has already yielded significant insights into breast carcinogenesis and will continue to pave the way for practical clinical applications.

关键词： clinical breast alterations

A quantitative second order Sobolev regularity for (inhmogeneous) normalized p(·)-Laplace equations

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

Acta Mathematica Sinica,English Series 2024年

作者： Yuqing wang Yuan ZhOU Department of Mathematics Beihang University School of Mathematical Sciences Beijing Normal University

Let ? be a domain of Rnwith n ≥ 2 and p(·) be a local Lipschitz funcion in ? with 1 1 and supUp(x) 0 and C ≥ 1 are independent of u. These extend the related results obtaind by Adamowicz-h?st?(IMRN, 2010) when n ...

Let ? be a domain of Rnwith n ≥ 2 and p(·) be a local Lipschitz funcion in ? with 1 he normalized p(·)-Laplace equation-?pN(·)u = 0 in ? as well as the corresponding inhomogeneous equation-?pN(·)u =f in ? with f ∈ C0(?). In particular, given any viscosity solution u to-?pN(·)u = 0 in ?, we prove the following:(i) in dimension n = 2, for any subdomain U∈? and any β ≥ 0, one has |Du|βDu ∈ Lloc2+δ(U) with a quantitative upper bound, and moreover, the map(x1, x2) → |Du|β(ux1,-ux2) is quasiregular in U in the sense that |D[|Du|βDu]|2≤-CdetD[|Du|βDu]βDu]α.e.in U.(ii) in dimension n ≥ 3, for any subdomain U∈? with infUp(x) > 1 and supUp(x) has D2u ∈ Lloc2+δ(U) with a quantitative upper bound, and also with a pointwise upper bound |D2u|2≤-C∑1≤i≤j≤n[uxixjuxjxi-uxixiuxjxj] α.e. in U. here constants δ > 0 and C ≥ 1 are independent of u. These extend the related results obtaind by Adamowicz-h?st?(IMRN, 2010) when n = 2 and β = 0.

关键词：

The Soft X-ray Imager(SXI)on the SMILE Mission

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Earth and Planetary Physics 2024年第1期8卷 5-14页

作者： S.Sembay A.L.Alme D.Agnolon T.Arnold A.Beardmore A.Belén Balado Margeli C.Bicknell C.Bouldin G.Branduardi-Raymont T.Crawford j.P.Breuer T.Buggey G.Butcher R.Canchal j.A.Carter A.Cheney Y.Collado-Vega h.Connor T.Crawford N.Eaton C.Feldman C.Forsyth T.Frantzen G.Galgóczi j.Garcia G.Y.Genov C.Gordillo h-P.Gröbelbauer M.Guedel Y.Guo M.hailey D.hall R.hampson j.hasiba O.hetherington A.holland S-Y.hsieh M.W.j.hubbard h.jeszenszky M.jones T.Kennedy K.Koch-Mehrin S.Kögl S.Krucker K.D.Kuntz C.Lakin G.Laky O.Lylund A.Martindale j.Miguel Mas hesse R.Nakamura K.Oksavik N.Østgaard h.Ottacher R.Ottensamer C.Pagani S.Parsons P.Patel j.Pearson G.Peikert F.S.Porter T.Pouliantis B.h.Qureshi W.Raab G.Randal A.M.Read N.M.M.Roque M.E.Rostad C.Runciman S.Sachdev A.Samsonov M.Soman D.Sibeck S.Smit j.Søndergaard R.Speight S.Stavland M.Steller TianRan Sun j.Thornhill W.Thomas K.Ullaland B.Walsh D.Walton C.wang S.Yang School of Physics and Astronomy University of LeicesterLeicesterLE17RHUK Space Park Leicester University of LeicesterLeicesterLE17RHUK Mullard Space Science Laboratory University College LondonDorkingRH56NTUK Centre for Electronic Imaging Open UniversityMilton KeynesMK76 AAUK Birkeland Centre for Space Science Department of Physics and TechnologyUniv.of BergenN-5007 BergenNorway University of Vienna A-1010 ViennaAustria Space Research Institute Austrian Academy of SciencesA-8042 GrazAustria National Institute of Aerospace Technology MadridSpain ESTEC European Space Agency2201 AZ NoordwijkNetherlands State Key Laboratory of Space Weather National Space Science CentreBeijing 100190China University of Applied Sciences and Arts Northwestern Switzerland CH-5210 WindischSwitzerland Koegl Space Gmbh CH-8157 DielsdorfSwitzerland Space Acoustics Gmbh CH-8157 DielsdorfSwitzerland Zurich University of Applied Sciences 8400 WinterhurSwitzerland Genov Solutions N-5172 LoddefjordNorway STM Engineering N-5165 LaksevagNorway john hopkins University Applied Physics Laboratory MD 20723USA NASA/Goddard Space Flight Centre MD 20771USA Center for Space Physics Boston UniversityBostonMA 02215USA Department of Theoretical Physics and Astrophysics Masaryk University60177 BrnoCzech Republic Institute of Physics E¨otvo¨s Lor´and University1053 BudapestHungary Aerospace Information Research Institute Chinese Academy of SciencesBeijing 100045China Centro de Astrobiologia(CAB) CSIC-INTAMadridSpain

The Soft X-ray Imager(SXI)is part of the scientific payload of the Solar wind Magnetosphere Ionosphere Link Explorer(SMILE)mission.SMILE is a joint science mission between the European Space Agency(ESA)and the Chinese Academy of Sciences(CAS)and is due for launch in 2025.SXI is a compact X-ray telescope with a wide field-of-view(FOV)capable of encompassing large portions of Earth’s magnetosphere from the vantage point of the SMILE orbit.SXI is sensitive to the soft X-rays produced by the Solar Wind Charge eXchange(SWCX)process produced when heavy ions of solar wind origin interact with neutral particles in Earth’s exosphere.SWCX provides a mechanism for boundary detection within the magnetosphere,such as the position of Earth’s magnetopause,because the solar wind heavy ions have a very low density in regions of closed magnetic field lines.The sensitivity of the SXI is such that it can potentially track movements of the magnetopause on timescales of a few minutes and the orbit of SMILE will enable such movements to be tracked for segments lasting many hours.SXI is led by the University of Leicester in the United Kingdom(UK)with collaborating organisations on hardware,software and science support within the UK,Europe,China and the United States.

关键词： Soft X-ray Imaging micropore optics large area CCD

Invasive ant learning is not affected by seven potential neuroactive chemicals

在线全文

学校读者我要写书评

暂无评论

Current Zoology 2024年第1期70卷 87-97页

作者： henrique Galante Tomer j.Czaczkes Department of Zoology and Evolutionary Biology Animal Comparative Economics LaboratoryUniversity of Regensburg93053 Regensburg Germany

Argentine ants Linepithema humile are one of the most damaging invasive alien species worldwide.Enhancing or disrupting cognitive abilities,such as learning,has the potential to improve management efforts,for example by increasing preference for a bait,or improving ants'ability to learn its characteristics or location.Nectar-feeding insects are often the victims of psychoactive manipulation,with plants lacing their nectar with secondary metabolites such as alkaloids and non-protein amino acids which often alter learning,foraging,or recruitment.however,the effect of neuroactive chemicals has seldomly been explored in ants.here,we test the effects of seven potential neuroactive chemicals-two alkaloids:caffeine and nicotine;two biogenic amines:dopamine and octopamine,and three nonprotein amino acids:β-alanine,GABA and taurineon the cognitive abilities of invasive L.humile using bifurcation mazes.Our results confirm that these ants are strong associative learners,requiring as little as one experience to develop an association.however,we show no short-term effect of any of the chemicals tested on spatial learning,and in addition no effect of caffeine on short-term olfactory learning.This lack of effect is surprising,given the extensive reports of the tested chemicals affecting learning and foraging in bees.This mismatch could be due to the heavy bias towards bees in the literature,a positive result publicationbias,ordifferences inmethodology.

关键词： associativelearning caffeine memory neuroactivechemicals

MOF-based magnetic microrobot swarms for ph-responsive targeted drug delivery

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

Science China Chemistry 2024年第4期67卷 1216-1223页

作者： Qinyi Cao Yifan Zhang Yanping Tang Changjin Wu jizhuang wang Dan Li College of Chemistry and Materials Science Jinan UniversityGuangzhou 510632China Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and Applications Jinan UniversityGuangzhou 510632China Guangdong Provincial Key Laboratory of Spine and Spinal Cord Reconstruction The Fifth Affiliated Hospital(Heyuan Shenhe People’s Hospital)Jinan UniversityHeyuan 517000China jNU-hKUST joint Laboratory for Neuroscience and Innovative Drug Research College of PharmacyJinan UniversityGuangzhou 510632China Department of Chemistry The University of Hong KongHong KongChina

Metal-organic frameworks(MOFs)hold significant potential as vehicles for drug delivery due to their expansive specific surface area,biocompatibility,and versatile attributes.Concurrently,magnetically actuated micro/nano-robots(MNRs)offer distinct advantages,such as untethered and precise manipulation.The fusion of these technologies presents a promising avenue for achieving non-invasive targeted drug delivery.here,we report a MOF-based magnetic microrobot swarm(MMRS)for targeted therapy.Our approach overcomes limitations associated with a single MNR,including limited drug loading and the risk of loss during manipulation.We select Zeolitic Imidazolate Framework-8(ZIF-8)as the drug vehicle for its superior loading potential and p h-sensitive decomposition.Our design incorporates magnetic responsive components into the one-pot synthesis of Fe@ZIF-8,enabling collective behaviors under actuation.Tuning the yaw angle of alternating magnetic fields and nanoparticles'amount,the MMRSs with controllable size achieve instantaneous transformation among different configurations,including vortex-like swarms,chain-like swarms,and elliptical swarms,facilitating adaptation to environmental variations.Transported to the subcutaneous T24 tumor site,the MMRSs with encapsulated doxorubicin(DOX)automatically degrade and release the drug,leading to a dramatic reduction of the tumor in vivo.Our investigation signifies a significant advancement in the integration of biodegradable MOFs into microrobot swarms,ushering in new avenues for accurate and non-invasive targeted drug delivery.

关键词： magnetic microrobot swarm MOF nanoparticles magnetic propulsion ph-responsive drug release targeted drug delivery