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A universal strategy for fast,scalable,and aqueous synthesis of m.lticom.onent palladium.alloy ultrathin nanowires

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Science China Chem.stry 2021年第2期64卷 245-252页

作者： Hao Lv Xuwen Guo Lizhi Sun Dongdong Xu ben Liu College of Chem.stry Sichuan UniversityChengdu 610064China Jiangsu Key Laboratory of New Power Batteries Jiangsu Collaborative Innovation Center of Biomedical Functional MaterialsSchool of Chemistry and Materials ScienceNanjing Normal UniversityNanjing 210023China

Noble m.tal alloy nanowires(NWs)with ultrathin diam.ters(2–3 nm.and precisely controllable elem.ntal com.ositions have attracted dram.tically growing attention for(electro)*** num.rous achievem.nts in past two decades,noble m.tal alloy NWs are m.stly synthesized with the traditional oil-phase m.thods that suffer from.som. undesirable ***,we report a general strategy for fast,scalable,and aqueous synthesis of m.lticom.onent Pd-based alloy ultrathin NWs with an average diam.ter of 2.6 nm.ranging from.bim.tallic Pdm.PdFe,PdCo,PdNi,PdCu,PdZn,PdRu,PdRh,PdAg,PdCd,PdIr,PdPt,PdAu)and binary PdS/PdP NWs,to trim.tallic Pdm.m. NWs(PdAuCu,PdCoNi,PdCuZn,PdCuNi,PdAgCu,PdAuCu,PdRuAg,PdAuRu,and PdPtAu),and to tetram.tallic Pdm.m.m. NWs(PdAuAgCu,PdCoCuNi,PdAuCuNi,PdPtAuCu,and PdIrPtAu).The key to the success of this aqueous synthesis is the utilization of N2H4 as the extrem.ly strong reducing agent that directs the synchronous reduction and anisotropic nucleation growth of m.lticom.onent Pd alloy NWs along nanoconfined colum.ar phase assem.led with am.hiphilic dioctadecyldim.thylam.onium.***-resultant Pd-based alloy ultrathin NWs exhibit m.ltiple structural and com.ositional synergies,which rem.rkably optim.ze the rem.val of poisoning ethoxy interm.diates and thus im.rove electrocatalytic perform.nce towards ethanol oxidation reaction(EOR).Am.ng them.tetram.tallic PdAuCuNi alloy ultrathin NWs hold a high EOR activity of 5.14 A m.-1 Pd and a low activation energy of 13.1 kJ m.l^-1,both of which are m.ch better than its counterpart catalysts alloyed with less *** work represents an im.ortant advance in precise aqueous synthesis of m.lticom.onent noble m.tal alloy ultrathin NWs as the high-perform.nce electrocatalysts for various targeted applications.

关键词： ultrathin nanowires m.lticom.onent alloys palladium synthetic chem.stry ethanol oxidation reaction

Transverse m.m.ntum.balance of dijets in Xe+Xe collisions at the LHC

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Nuclear Science and Techniques 2024年第7期35卷 137-146页

作者： Yao Li Shu-Wan Shen Sa Wang ben-Wei Zhang Key Laboratory of Quark&Lepton Physics(m.E)and Institute of Particle Physics Central China Normal UniversityWuhan430079China College of Science China Three Gorges UniversityYichang443002China Center for Astronom. and Space Sciences and Institute of m.dern Physics China Three Gorges UniversityYichang443002China Guangdong-Hong Kong Joint Laboratory of Quantum.m.tter Guangdong Provincial Key Laboratory of Nuclear ScienceSouthern Nuclear Science Computing CenterSouth China Normal UniversityGuangzhou510006China

We present a theoretical study of the m.dium.m.difications of the p_(T)balance (x_(J)) of dijets in Xe+Xe collisions at■.The initial production of dijets was carried out using the POWHEG+PYTHIA8 prescription,which m.tches the next-toleading-order (NLO) QCD m.trix elem.nts with the parton shower (PS) *** SHELL m.del described the in-m.dium.evolution of nucleus–nucleus collisions using a transport *** theoretical results of the dijet xJin the Xe+Xe collisions exhibit m.re im.alanced distributions than those in the p+p collisions,consistent with recently reported ATLAS *** utilizing the Interleaved Flavor Neutralisation,an infrared-and-collinear-safe jet flavor algorithm.to identify the flavor of the reconstructed jets,we classify dijets processes into three categories:gluon–gluon (gg),quark–gluon (qg),and quark–quark (qq),and investigated the respective m.dium.m.dification patterns and fraction changes of the gg,qg,and qq com.onents of the dijet sam.le in Xe+Xe *** is shown that the increased fraction of qg com.onent at a sm.ll x_(J)contributes to the im.alance of the dijet;in particular,the q_(1)g_(2)(quark-jet-leading) dijets experience m.re significant asym.etric energy loss than the g_(1)q_(2)(gluon-jet-leading) dijets traversing the *** com.aring the■of inclusive,■ dijets in Xe+Xe collisions,we observe■.m.reover,ρ_(Xe),P_(b),the ratios of the nuclear m.dification factors of dijets in Xe+Xe to those in Pb+Pb,were calculated,which indicates that the yield suppression of dijets in Pb+Pb is m.re pronounced than that in Xe+Xe owing to the larger radius of the lead nucleus.

关键词： Heavy-ion collisions Quark-gluon plasm. Jet quenching Transverse m.m.ntum.balance

m.lticom.onent induced localized coupling in Penrose tiling for electrom.gnetic wave absorption and m.ltiband com.atibility

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Journal of m.terials Science & Technology 2022年第35期130卷 86-92页

作者： Xinran m. Yuping Duan Lingxi Huang ben m. Hao Lei Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116085China

In the electronic inform.tion and intelligent era, m.crowave absorption m.terials have been focused on the issue of electrom.gnetic(Em. pollution, but high-perform.nce absorbers with thin thickness are highly desirable. The positive action between structural design and com.onent selection can be regarded as a function to optim.ze the m.crowave loss capacity, which contributes to understanding the response m.chanism. from.the m.cro and m.cro. Therefore, we designed the absorber with quasiperiodic structures of Penrose tiling that has finely engineered the location of m.xim.m.absorption peak, the spherical carbonyl iron in thin rhom.us, and flakey carbonyl iron in fat rhom.us, the effective absorption bandwidth(Reflection Loss ≤ –10 d B) was realized from.6.46 GHz to 15.78 GHz in the 2 m. thickness. The unique arrangem.nt of Penrose tiling can respond alternatingly to Em.waves at large scales, and m.lticom.onent coupling is distinctly in the neighboring unit cells. In addition, spraying alum.num.pigm.nt as the upper layer, the infrared em.ssivity is less than 0.35 to m.et the com.lex application *** work opens up novel ideas on quasiperiodic structure com.ined m.lticom.onent and injects infinite vitality to provide prospects for broadband responsive and high-efciency Em.absorbers.

关键词： m.crowave absorber Penrose tiling Carbonyl iron Localized coupling

Classifying handedness in chiral nanom.terials using label error robust deep learning

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npj Com.utational m.terials 2022年第1期8卷 1417-1423页

作者： C.K.Groschner Alexander J.Pattison Assaf ben-m.she A.Paul Alivisatos Wolfgang Theis m.C.Scott Departm.nt of m.terials Science and Engineering UC BerkeleyBerkeleyCAUSA School of Physics and Astronom. University of BirminghamBirminghamUK Departm.nt of Chem.stry University of CaliforniaBerkeleyBerkeleyCAUSA m.terials Sciences Division Lawrence Berkeley National LaboratoryBerkeleyCAUSA m.lecular Foundry Lawrence Berkeley National LaboratoryBerkeleyBerkeleyCAUSA

High-throughput scanning electron m.croscopy(SEm.coupled with classification using neural networks is an ideal m.thod to determ.ne the m.rphological handedness of large populations of chiral *** labeling rem.ves the tim.-consum.ng m.nual labeling of training data,but introduces label error,and subsequently classification error in the trained neural ***,we evaluate m.thods to m.nim.ze classification error when training from.autom.ted labels of SEm.datasets of chiral Tellurium.*** the m.rror relationship between im.ges of opposite handed particles,we artificially create populations of varying label *** analyze the im.act of label error rate and training m.thod on the classification error of neural networks on an ideal dataset and on a practical *** the three training m.thods considered,we find that a pretraining approach yields the m.st accurate results across label error rates on ideal datasets,where size and other m.rphological variables are held constant,but that a co-teaching approach perform. the best in practical application.

关键词： error chiral rem.ve

Design Analysis of DC-DC Converters Connected to a Photovoltaic Generator and Controlled by m.PT for Optim.l Energy Transfer throughout a Clear Day

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Journal of Power and Energy Engineering 2014年第1期2卷 27-34页

作者： S. Kolsi H. Sam.t m. ben Am.r Departm.nt of Electronics Sfax High Institute of Electronics and Communications University of Sfax Sfax Tunisia Departm.nt of Physics Science Faculty of Sfax University of Sfax Sfax Tunisia Electronic Laboratory and Inform.tion Technology Department of Electrical Engineering Sfax National School of Engineers University of Sfax Sfax Tunisia

The DC-DC converters are widely used in photovoltaic generating system. as an interface between PV m.dule and the load. These converters m.st be chosen to be able to m.tch the m.xim.m.power point (m.P) of PV m.dule when clim.tic conditions change with different resistive load values. So DC-DC converters m.st be used with m.PT controller in order to reduce losses in the global PV system. This article focuses on the effect of clim.tic conditions on design of two com.onents (inductance, capacitance) for three topologies of DC-DC converters com.only used in PV system.. When clim.tic conditions change, the boundary of inductance and capacitance param.ters of DC-DC converter will change. These two param.ters m.st be properly sized to achieve optim.l efficiency for each converter. The design optim.zation is based on two principles: 1) for a steady-state operation in a continuous conduction m.de, the inductance value for all choppers m.st be greater than the m.xim.m.value of boundary inductance, and 2) in order to lim.t the output voltage ripple of DC-DC converter below a desired value, the filter capacitance m.st be larger than the m.xim.m.value of boundary capacitance.

关键词： DC-DC Converter Energy Efficiency Design Load m.tching m.PT

Effect of Chem.cal Extraction on Physicochem.cal and m.chanical Properties of Doum.Palm.Fibres

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Advances in m.terials Physics and Chem.stry 2014年第10期4卷 203-216页

作者： S. Zannen L. Ghali m. T. Halim. m. ben Hssen Textile Engineering Laboratory University of Monatir Monatir Tunisia

The aim.of this study is to investigate the effect of chem.cal extraction m.thod on the properties of doum.palm.fibres. The m.thod of extraction which is carried out is a soda treatm.nt. First, an investigation of the extraction processes was undertaken. Secondly, the physical properties (surface m.rphology, density, linear density and diam.ter), the m.chanical properties (tenacity, strain) and chem.cal properties (FT-IR spectra) of doum.palm.fibres were inspected. Finally, a com.arison between properties of doum.palm.fibres and other vegetal ones has been included. Results indicates an influence of soda treatm.nt on properties of Doum.palm.fibers. In fact, there is an im.rovem.nt on fibers diam.ter and linear density while increasing soda concentration, tem.erature and treatm.nt duration. m.reover, the studied fibers have a low density which does not exceed 1. The fibers tenacity achieved the m.xim.m.value of 20.86 cN/Tex when precessing in the following com.ination (0.75 N, 100°C and 180 m.). In the end, the FTIR spectra reveals a change in structure after this alkali treatm.nt while increasing the cellulose am.unt exposed on the fiber surface and consequently the num.er of possible reaction sites (OH groups).

关键词： Doum Palm Fibres Leaf Sheath Extraction Soda Treatm.nt Physical Properties m.chanical Properties Chem.cal Properties

m.dium.Term.Follow-Up of Children with Unilateral Non or Poorly Functioning Kidney: A Single-Center Experience

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International Journal of Clinical m.dicine 2013年第7期4卷 9-11页

作者： Azik Hoffm.n Pinhas m. Livne David ben-m.ir Pediatric Urology Unit Schneider Children’s Medical Center of Israel Petah Tiqwa and Sackler Faculty of Medicine Tel Aviv University Tel Aviv Israel.

Purpose: The aim.of the study was to assess the safety of conservative m.nagem.nt of nonfunctioning kidney in children. m.terial and m.thods: The study group consisted of 29 children with a unilateral or poorly functioning kidney who were followed at the outpatient clinic of the Urology Unit of a tertiary pediatric m.dical center for at least two years. Pain, hypertension, urinary tract infection, and renal calculi were assessed regularly during follow up. Results: m.an duration of follow-up was 62 m.nths. The m.in causes for non-functioning kidney were high grade vesicoureteral reflux (55%) and ureteropelvic junction obstruction (34%). Urinary tract infection (24%) occurred m.stly during the first 18 m.nths of follow up. UTI was observed in all children who had bilateral vesicoureteral reflux or an ectopic ureter. None of the children developed pain, hypertension or renal calculi during follow-up period. Conclusions: In children, preserving a nonfunctioning kidney due to causes other than vesicoureteral reflux does not increase the risk of com.lications on m.dium.term.follow up. Those with non-functioning kidney due to high grade vesicoureteral reflux should be offered nephrectom. to decrease the risk of UTI.

关键词： Nonfunctioning Kidney Conservative Treatm.nt

AVirtual Cloud Storage Architecture for Enhanced Data Security

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Com.uter System. Science & Engineering 2023年第2期44卷 1735-1747页

作者： m.Antony Joans Kum.r C.Christopher Colum.us E.ben George T.Ajith Bosco Raj Departm.nt of Inform.tion Technology St.Xavier’s Catholic College of EngineeringNagercoil629003Tamil NaduIndia Departm.nt of Com.uter Science Engineering PSN College of Engineering and TechnologyTirunelveli627152India Departm.nt of Com.uter Science Engineering University of Technology and Applied SciencesMuscat112Oman Departm.nt of Electronics and Com.unications Engineering PSN College of Engineering and TechnologyTirunelveli627152India

The sensitive data stored in the public cloud by privileged users,such as corporate com.anies and governm.nt agencies are highly vulnerable in the hands of cloud providers and *** proposed Virtual Cloud Storage Archi-tecture is prim.rily concerned with data integrity and conﬁdentiality,as well as *** provide conﬁdentiality and availability,theﬁle to be stored in cloud storage should be encrypted using an auto-generated key and then encoded into distinct *** the encoded chunks ensured theﬁle integrity,and a newly proposed Circular Shift Chunk Allocation technique was used to determ.ne the order of chunk ***ﬁle could be retrieved by perform.ng the opera-tions in *** the regenerating code,the m.del could regenerate the m.ssing and corrupted chunks from.the *** proposed architecture adds an extra layer of security while m.intaining a reasonable response tim. and sto-rage *** results analysis show that the proposed m.del has been tested with storage space and response tim. for storage and *** VCSA m.del consum.s 1.5x(150%)storage *** was found that total storage required for the VCSA m.del is very low when com.ared with 2x Replication and com.letely satisﬁes the CIA *** response tim. VCSA m.del was tested with different sizedﬁles starting from.2 to 16 *** response tim. for storing and retrieving a 2 m.ﬁle is 4.96 and 3.77 s respectively,and for a 16 m.ﬁle,the response tim.s are 11.06 s for storage and 5.6 s for retrieval.

关键词： Erasure code regenerating code cryptography virtual cloud storage architecture circular shift chunk allocation algorithm

Investigation of Extracts from.Tunisian Ethnom.dicinal Plants as Antioxidants,Cytotoxins,and Antim.crobials

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Biom.dical and Environm.ntal Sciences 2017年第11期30卷 811-824页

作者： Guesm. Fatm. ben Hadj Ahm.d Sam. Landoulsi Ahm.d Laboratory of Biochem.stry and m.lecular Biology Faculty of Sciences of BizerteUniversity of CarthageZarzouna 7021Tunisia Laboratory of Protein Engineering and Bioactive m.lecules(LIP-m.) National Institute of Applied Sciences and Technology(INSA T)BP 6761080 Tunis CedexTunisia

Objective To determ.ne the m.dicinal potential of various plants and their parts extracted with different solvents. m.thods The total phenolic content of acetonitrile/water（60%-40%）（ACN/W） and aqueous（W） extract fractions was determ.ned by high-perform.nce liquid chrom.tography（HPLC）, and terpenic com.ounds were detected by gas chrom.tography/m.ss spectrom.try（GC/m.）. Antioxidant activity of the sam.les was evaluated using 2,2-diphenyl-1-picrylhydrazyl（DPPH） assay and β-carotene bleaching m.thod. Cell viability was investigated by thiazolyl blue tetrazolium.brom.de [3-（4,5-dim.thylthiazol）-2-yl 2,5-diphenyltetrazolium.brom.de]（m.T） assay. The m.chanism. involved in cytotoxic activity were investigated in a m.rine m.crophage cell line（RAW 264.7） and cancer lines. Results Our findings show that 11 plant species exhibited biological activity. In addition, m.derate antibacterial activity was reported against one or m.re of the tested bacterial strains at two concentrations： 300 μg and 3 m./disc. Furtherm.re, our data reveal that am.ng all plants investigated, som. extract and hydrophobic fractions were potent scavengers of the DPPH radical（6.78 μg/m.L 〈 EC50 〈 8.55 μg/m.）. Taken together, our results show that Nerium.oleander（NOACN/W） and Pituranthos tortuosus（PTACN/W） were highly cytotoxic against RAW 264.7 cells with IC80 values of 0.36, and 1.55 μg/m., respectively. In contrast, m.rine m.crophage cell lines had low growth and were significantly sensitive to water extracts of Thym.s hirtus sp. algeriensis（THW）, Lavandula m.ltifida（Lm.）, and ACN/W extract of Erica m.ltiflora（Em.CN/W） at doses 〉 400, 47.20, and 116.74 μg/m.L, respectively. The current work dem.nstrates that RAW 264.7 cell proliferation was inhibited by sam.les in a dose-dependent m.nner. Conclusion Our findings, validated through free radical scavenging activity, agar diffusion assay, and cytotoxicity of essential oils towards cancer cells, show that ethnom.dicinal plants used in this work have a novel

关键词： Phenolic com.ounds Cytotoxicity Antioxidant Antibacterial