检索结果-南通市图书馆

One-neutron stripping proces. in the^(209)Bi(^(6)Li,^(5)Li)^(210)Bi*reaction reaction

Nuclear Science and Techniques 2024年第6期35卷 120-129页

作者： Gao-Long Zhang Zhen-Wei Jiao Guang-Xin Zhang E.N.Cardozo B.Paes.Shi-Peng Hu Jian-Qiang Qian Daniele mengoni Wei-Wei Qu Cong-Bo Li Yun Zheng Huan-Qiao Zhang Hui-Bin Sun Nan Wang Chun-Lei Zhang J.J.Valiente-Dobón D.Tes.ov m.mazzocco A.Gozzelino C.Parascandolo D.Pierroutsakou m.La Commara A.Goasduff D.Bazzacco D.R.Napoli F.Galtarossa F.Recchia A.Illana S.Bakes.I.Zanon S.Aydin Gde Angelis m.Siciliano R.menegazzo S.m.Lenzi S.Akkoyun L.F.Canto J.Lubian School of Physics Beihang UniversityBeijing 100191China Sino-French Institute of Nuclear Engineering and Technology Sun Yat-Sen UniversityZhuhai 519082China Instituto de Física Universidade Federal Fluminense24210-340 NiteróiRio de JaneiroBrazil Laboratorio TANDAR Comisión Nacional de Energía AtómicaBKNA1650 San MartíınArgentina Institute for Advanced Study in Nuclear Energy and Safety Shenzhen UniversityShenzhen 518060China Shenzhen Key Laboratory of Res.arch and manufacture of High Purity Germanium materials and Fetectors Shenzhen UniversityShenzhen 518060China INFN Sezione di PadovaPaduaItaly Dipartimento di fisica Astronomia dell’Universita di padova PaduaItaly State Key Laboratory of Radiation medicine and Protection School of Radiation Medicine and ProtectionSoochow UniversitySuzhou 215123China China Institute of Atomic Energy Beijing 102413China The Key Laboratory of Beam Technology and material modification of ministry of Education College of Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875China Laboratori Nazionali di Legnaro INFN35020 LegnaroItaly INFN Sezione di Napoli80126 NaplesItaly Dipartimento di Farmacia Universitàdi Napoli“Federico II”80131 NaplesItaly Department of Natural and mathematical Sciences Faculty of EngineeringTarsus University33480 MersinTurkey Physics Division Argonne National LaboratoryLemontILUSA Department of Physics Sivas Cumhuriyet UniversitySivasTurkey Instituto de Física Universidade Federal do Rio de JaneiroRio de Janeiro CP 6852821941-972Brazil

One-neutron stripping proces. between^(6)Li and^(209)Bi was studied at 28,30,and 34 meV using the in-beamγ-ray spectroscopy ***γ-γcoincident analysis clearly identified twoγ-rays feeding the ground and long-lived isomeric states.which were employed to determine the cross *** one-neutron stripping cross sections were similar to the cross sections of complete fusion in the^(6)Li+^(209)Bi system,but the one-neutron stripping cross sections decreased more gradually at the sub-barrier region.A coupled-reaction-channel calculation was performed to study the detailed reaction mechanism of the one-neutron stripping proces. in^(6)*** calculations indicated that the first excited state of 5 Li is critical in the actual one-neutron transfer mechanism,and the valence proton of 209Bi can be excited to the low-lying excited state in(^(6)Li,^(5)Li)reaction,unlike in the(d,p)reaction.

关键词： Transfer reaction Weakly bound nuclei Cross section

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Experimental verification of ill-defined topologies.and energy sinks in electromagnetic continua

引用

Advanced Photonics 2022年第3期4卷 97-104页

作者： David E.Fernandes.Ricardo A.m.Pereira Sylvain Lannebère Tiago A.morgado mário G.Silveirinha University of Coimbra Instituto de Telecomunicações and Department of Electrical EngineeringCoimbraPortugal University of Aveiro Instituto de TelecomunicaçõesDepartment of ElectronicsTelecommunications and InformaticsAveiroPortugal University of Lisbon Instituto Superior Técnico and Instituto de TelecomunicaçõesDepartment of Electrical EngineeringLisboaPortugal

.It is experimentally verified that nonreciprocal photonic systems with continuous translation symmetry may have an ill-defined *** topological classification of such systems is only feasible when the material res.onse is regularized with a spatial-frequency *** experimentally demonstrate that adjoining a small air layer to the relevant material interface may effectively imitate an idealized spatial cutoff that suppres.es.the nonreciprocal res.onse for short wavelengths and regularizes.the ***,it is experimentally verified that nonreciprocal systems with an ill-defined topology may be used to abruptly halt the energy flow in a unidirectional waveguide due to the violation of the bulk-edge *** particular,we report the formation of an energy sink that absorbs the incoming electromagnetic waves.with a large field enhancement at the singularity.

关键词： topological photonics nonreciprocity topological singularities bulk edge corres.ondence.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Tritrichomonas foetus:New structures.by high-res.lution scanning helium ion microscopy

引用

BIOCELL 2021年第2期45卷 259-266页

作者： mARLENE BENCHImOL ABIGAIL mIRANDA-mAGALHÃes.ANTONIO PEREIRA-NEVes.WANDERLEY DE SOUZA Universidade do Grande rio Duque de Caxias25071-202Rio de Janeiro Departamento de microbiologia Laboratório de Biologia Celular de PatógenosFiocruzInstituto Aggeu MagalhãesRecife52060-269Brazil Universidade Federal do rio de Janeiro Instituto de Biofísica Carlos Chagas FilhoLaboratório de Ultraestrutura Celular Hertha Meyer Instituto Nacional de Ciência e Tecnologia(INBEB)and Centro Nacional de Biologia Estrutural e Bioimagens(CENABIO)Rio de Janeiro21941-902Brazil

Helium ion scanning microscopy(HIm)is a novel high-res.lution scanning microscopy technique that uses.helium ions instead of electrons to form images.of the highes. quality and res.lution,providing a sub-nanometer res.lution sputter uncoated biological ***,we took advantage of HIm to explore the cell surface of Tritrichomonas foetus,a protist parasite of cattle that provokes.hard infection and abortion in *** des.ribe thin protrusions,like nanotubes.des.ribed in other cells,with different sizes.27 nm to 81 nm in thicknes.)and various lengths(from 73 nm to 2μm),as well bulbous structures.either budding from the cell surface or pres.nt in the extremities.of some *** flagella also pres.nted thes. thin protrusions and different protein decoration,similar to those previously des.ribed using freeze-fracture *** between two cells were also seen,and their role in infection is *** cell surface was also examined and showed several pits indicative of endocytic activity and other types.of arrays of *** observations were confirmed using Scanning Electron microscopy(SEm),negative staining,and conventional thin sectioning for observation by transmission electron *** findings provide new and relevant information that may contribute to a better understanding of protozoan biology and its interaction with mammalian cells.

关键词： Nanotubes microves.cles Surface specializations

来源：

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

Chemical Composition of the es.ential Oil and Nitrogen metabolism of menthol mint under Different Phosphorus Levels

引用

American Journal of Plant Sciences 2014年第15期5卷 2312-2322页

作者： marco A. A. Souza Osmário J. L. Araújo Diego m. C. Brito manlio S. Fernandes.Rosane N. Castro sonia R. Souza Department of Chemistry Universidade Federal Rural do Rio de Janeiro Seropédica Brazil Soil Department Universidade Federal Rural do Rio de Janeiro Seropédica Brazil

The purpose of this work was to evaluate the effects of different phosphorus levels (0.05, 0.5, 1 and 2 mm) under nitrogen metabolism and the es.ential oil profile of menthol mint (mentha arvensis L.). The relationship between the leaf maturity and the es.ential oil profile was also explored. The experiment was conducted in a hydroponic system located in a grow chamber during 41 days and after the harves., nitrate reductase activity, and the -N, amino-N, and soluble sugars levels of each plant part were evaluated. Also the es.ential oil from young leaves.(6th to 8th node) and adult leaves.(3rd to the 5th node) was analyzed. An uptake mechanism related to the increase in fres. weight of the roots was promoted with the use of low P levels (0.05 and 0.50 mmol·L-1). With 1 mmol·L-1 P plants showed in all parts an increased nitrate reductase activity and high levels of nitrate and amino-N in leaves. Plants submitted to the lowes. P level (0.05 mmol·L-1) pres.nted high levels of menthol. In leaves.from 6th to 8th node (mature leaves. menthol level was approximately 87% of the es.ential oil however leaves.from the 3rd to the 5th node (young leaves. showed high levels of pulegone, that can be toxic for humans. The res.lts indicate that the es.ential oil quality in menthol mint is influenced by the leaf maturity and the P levels. Also it was showed that the oil extracted from mature leaves.of plants under low P levels has the bes. commercial profile.

关键词： mentha arvensis L. Lamiaceae Gas Chromatography Hydropony menthol

来源：

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

Gold Supported on metal Oxides.for Carbon monoxide Oxidation

引用

Nano Res.arch 2011年第2期4卷 180-193页

作者： sonia A. C. Carabineiro Nina Bogdanchikova miguel Avalos-Borja Alexey Pes.ryakov Pedro B. Tavares.Jose L. Figueiredo Laboratário de Catálise e materiais Associate Laboratory LSRE/LCM Departamento de Engenharia Química Faculdade de Engenharia Universidade do Porto 4200-465 Porto Portugal Universidad Nacional Autónoma de méxico Centro de Nanociencias y Nanotecnologia Carretera Tijuana-Ensenada 22800 Ensenada Baja California México Tomsk Polytechnic University 30 Lenin Avenue Tomsk 634050 Russia Universidade de Trás-os-montes.e Alto Douro Centro de Quimica-Vila Real Departamento de Química 5001-911 Vila Real Portugal

Au has been loaded （1% wt.） on different commercial oxide supports （CuO, La2O3, Y2O3, NiO） by three different methods： double impregnation （DIm）, liquid-phase reductive deposition （LPRD）, and ultrasonication （US）. Samples.were characterised by N2 adsorption at -196℃, high-res.lution transmission electron microscopy, selected area electron diffraction, energy dispersive X-ray spectrometry, high-angle annular dark-field imaging （Z-contrast）, X-ray diffraction, and temperature programmed reduction. CO oxidation was used as a tes. reaction to compare the catalytic activities. The bes. res.lts were obtained with Au loaded by DIm on the NiO support, with an activity of 7.2 × 10^（-4） molco·gAu^（-1）·s^（-1） at room temperature. This is most likely related to the Au nanoparticle size being the smalles. in this catalyst （average 4.8 nm）, since it is well known that gold particle size determines.the catalytic activity. Other samples. having larger Au particle sizes.（in the 2-12 nm range, with average sizes.ranging from 4.8 to 6.8 nm）, showed lower activities. Nevertheles., all samples.prepared by DIm had activities.（from 1.1 × 10^（-4） to 7.2 × 10^（-4） molco·gAu^（-1）·S^（-1）, at room temperature） above those reported in the literature for gold on similar oxide supports. Therefore, this method gives.better res.lts than the most usual methods of deposition-precipitation or co-precipitation.

关键词： Gold heterogeneous catalysis oxidation electron diffraction X-ray diffraction

来源：

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

Protection status as determinant of carbon stock drivers in Cerrado sensu stricto

引用

Journal of Plant Ecology 2020年第3期13卷 361-368页

作者： Kelly marianne Guimarães.Pereira Natielle Gomes.Cordeiro marcela de Castro Nunes.Santos Terra marcela Venelli Pyles.Christian Dias Cabacinha Josémárcio de mello Eduardo van den Berg Department of Biology Federal University of LavrasCampus UniversitárioCEP 37200-000LavrasMinas Gerais stateBrazil Department of Fores. Sciences Federal University of LavrasCampus UniversitárioCEP 37200-000LavrasMinas Gerais stateBrazil Department of Fores. Sciences Institute of Agrarian SciencesFederal University of Minas GeraisCampus Regional de Montes ClarosCEP 39.404-547Montes ClarosMinas Gerais stateBrazil

Aims Natural vegetation plays an important role in global carbon cycling and ***,the Cerrado(Brazilian savannah)is considered a carbon sink because of its intrinsic *** aim was to evaluate how the aboveground biomass and biodiversity relationship change between three Cerrado remnants with different protection status:a‘control area’(Legal Res.rve area),a protected area(PA)and a non-protected area(Non-PA).methods All three studied fragments are situated in northern minas Gerais state,*** es.imated the aboveground carbon stocks based on the fores. *** also measured three dimensions of biodiversity metrics for each plot:functional trait dominance,taxonomic diversity and functional *** following functional traits were evaluated for the species.wood density,maximum diameter and seed *** carried out generalized linear models seeking to evaluate how carbon stocks,community-weighted mean(CWm)trait values.species.richnes. and diversity,and functional diversity indices.differ among the *** Findings The Cerrado areas without protection status had lower carbon stocks,species.richnes.,species.diversity,functional richnes. and functional dispersion,whereas both PA and Non-PA had lower CWm maximum diameter and seed size compared with the Legal Res.rve control *** linear models showed that carbon stocks,species.and functional richnes. metrics were correlated within and across sites.and thus,species.richnes. could serve as a good proxy for functional richnes. and carbon *** carbon stocks were positively driven by species.richnes. and CWm maximum diameter,while they were negatively driven by functional *** richnes.,species.diversity and CWm seed size appeared in the set of bes. models,but with no significant direct effect on carbon ***,we concluded that absence of protection in the Cerrado areas decreases.both species.richnes. and carbon stocks.

关键词： functional traits biodiversity biomass storage Brazilian Savanna human impacts

来源：

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

Uniform-velocity spacetime crystals

引用

Advanced Photonics 2019年第5期1卷 17-42页

作者： Zoé-Lise Deck-Léger Nima Chamanara maksim Skorobogatiy mário G.Silveirinha Christophe Caloz Polytechnique montréal Department of Electrical EngineeringMontréalQuebecCanada Polytechnique montréal Department of Engineering PhysicsMontréalQuebecCanada Universidade de Lisboa-Instituto Superior Técnico and Instituto de Telecomunicações Department of Electrical EngineeringLisbonPortugal

We perform a comprehensive analysis of uniform-velocity bilayer spacetime crystals,combining concepts of conventional photonic crystals and special *** that a spacetime crystal consists of a sequence of spacetime discontinuities.we do this by solving the following sequence of problems:(1)the spacetime interface,(2)the double spacetime interface,or spacetime slab,(3)the unbounded crystal,and(4)the truncated *** thes. problems,we pres.nt the following res.lts:(1)an extension of the Stokes.principle to spacetime interfaces.(2)an interference-based analysis of the interference phenomenology,(3)a quick linear approximation of the dispersion diagrams,a des.ription of simultaneous wavenumber and frequency bandgaps,and(4)the explanation of the effects of different types.of spacetime crystal truncations and the corres.onding scattering *** work may constitute the foundation for a virtually unlimited number of novel canonical spacetime media and metamaterial problems.

关键词： crystals special relativity Lorentz transformations spacetime bandgap structures

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Expres.ion of the Genes.OsNRT1.1, OsNRT2.1, OsNRT2.2, and Kinetics of Nitrate Uptake in Genetically Contrasting Rice Varieties

引用

American Journal of Plant Sciences 2015年第2期6卷 306-314页

作者： Osmário J. L. Araújo milena S. Pinto marcus V. L. Sperandio Leandro A. Santos Elvia m. L. m. Stark manlio S. Fernandes.André marques.dos Santos sonia Regina de Souza Plant Nutrition Laboratory Department of Soil Universidade Federal Rural do Rio de Janeiro Seropédica Brazil Plant Biochemistry Laboratory Department of Chemistry Universidade Federal Rural do Rio de Janeiro Seropédica Brazil

Four genetically contrasting rice varieties.(IAC-47, Bico Ganga, Arroz de Revenda and manteiga) according to Random Amplified Polymorphic DNA (RAPD) analysis were asses.ed regarding expres.ion of the genes.OsNRT1.1, OsNRT2.1 and OsNRT2.2 and the nitrate uptake kinetics parameters (Km and Vmax). Up to 250-fold increases.in the induction of gene expres.ion after nitrate res.pply were observed for the high-affinity transporter (OsNRT2.1 and OsNRT2.2). However, no significant variations in Vmax among the varieties.were obtained. The lower value of Km of the IAC-47 cultivar in relation to the Arroz de Revenda variety sugges.s a greater role of high-affinity transporter genes. Thes. res.lts indicate that closer attention should be paid to the expres.ion levels of thes. genes.in selecting varieties.aiming to enhance nitrogen uptake efficiency.

关键词： RAPD Nitrogen Nitrogen Use Efficiency Oryza sativa L.

来源：

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

Treatability studies.of naphthalene in soil,water and air with persulfate activated by iron(Ⅱ)

引用

Journal of Environmental Sciences 2020年第4期32卷 67-77页

作者： Gabriela P.mendes.Vivian m.A.magalhaes.Lélia C·R·Soares.Rayanne m.Aranha Claudio A.O.Nascimento marilda m.G.R.Vianna Osvaldo Chiavone-Filho Department of Chemical Engineering University of Sao PauloSPf 05508-000Brazil Department of Chemical Engineering Federal University of Rio Grande Do NorteNatalRN59072-970Brazil

Chemical oxidation was applied to an artificially contaminated soil with naphthalene(NAP).Evaluation of NAP distribution and mass reduction in soil,water and air phases.was carried out through mass *** of NAP distribution and mass reduction in soil,water and air phases.was carried out through mass *** importance of the air phase analysis was emphasized by demonstrating how NAP behaves.in a sealed system over a 4 hr reaction *** of Experiments method was applied to the following variables.sodium persulfate concentration[SP],ferrous sulfate concentration[Fes.4],and *** system operated with a prefixed solid to liquid ratio of 1:*** following conditions res.lted in optimum NAP removal[SP]=18.37 g/L,[Fes.4]=4.25 g/L and pH=*** the end of the 4 hr reaction,62%of NAP was *** the soil phase,the chemical oxidation reduced the NAP concentration thus achieving levels which comply with Brazilian and USA environmental *** the NAP partitioning view,the monitoring of each phase allowed the variabilities.asses.ment over the proces.,refining the knowledge of mass *** on NAP distribution in the system,this study demonstrates.the importance of evaluating the pres.nce of semi-volatile and volatile organic compounds in the air phase during remediation,so that there is greater control of the system as to the distribution and pres.nce of the contaminant in the *** res.lts highlight the importance of treating the contaminant in all its phases.at the contaminated site.

关键词： Chemical oxidation Phase distribution Degradation kinetics PAH Soil remediation mass balance

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Photonics of time-varying media

引用

Advanced Photonics 2022年第1期4卷 30-61页

作者： Emanuele Galiffi Romain Tirole Shixiong Yin Huanan Li Stefano vezzoli Paloma A.Huidobro mário G.Silveirinha Riccardo Sapienza Andrea Alù J.B.Pendry City University of New York Photonics InitiativeAdvanced Science Research CenterNew YorkUnited States Imperial College London Blackett LaboratoryDepartment of PhysicsLondonUnited Kingdom Nankai University School of PhysicsTianjinChina Instituto de Telecomunicações Instituto Superior Técnico-University of LisbonLisboaPortugal City University of New York Physics ProgramGraduate CenterNew YorkUnited States

Time-varying media have recently emerged as a new paradigm for wave manipulation,due to the synergy between the discovery of highly nonlinear materials,such as epsilon-near-zero materials,and the ques. for wave applications,such as magnet-free nonreciprocity,multimode light shaping,and ultrafast *** this review,we provide a comprehensive discussion of the recent progres. achieved with photonic metamaterials whose properties.stem from their modulation in *** review the basic concepts underpinning temporal switching and its relation with spatial scattering and deploy the res.lting insight to review photonic time-crystals and their emergent res.arch avenues.such as topological and non-Hermitian *** then extend our discussion to account for spatiotemporal modulation and its applications to nonreciprocity,synthetic motion,giant anisotropy,amplification,and many other ***,we conclude with a review of the most attractive experimental avenues.recently demonstrated and provide a few perspectives.on emerging trends for future implementations of time-modulation in photonics.

关键词： time-varying media temporal modulation metamaterials switching optics photonics light

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：