检索结果-南通市图书馆

Soil Form.tion of "Atlantic Rankers" from.NW Spain—A High Resolution Alum.nium.and Iron Fractionation Study

Pedosphere 2008年第4期18卷 441-453页

作者： J. KAAL m. costa-casais C. FERRO-VZQUEZ X. PONTEVEDRA-POm.AL A. m.RTINEZ-CORTIZAS Instituto de Estudios Galegos Padre Sarm.ento Laboratorio de Arqueología del Paisaje (LAr) IEGPS-CSIC-XuGaRúa San Roque 2 15704 Santiago de Compostela (Spain). Departam.nto de Edafología y Quím.ca Agrícola Fac. Biología Universidad de Santiago (Spain)

Atlantic rankers belong to the group of ＂cryptopodzolic rankers＂, which are ubiquitous in the m.untainous cool/tem.erate hum.d regions of Western Europe. The rankers of Galicia （NW Spain） form.d by thousands of years of colluviation. The preponderance of Al-stabilised organic m.tter （Om. m.sks the horizonation and polycyclic character （i.e., stratification） of these soils. Cryptopodzolic rankers are generally thought to be the outcom. of podzolisation. This soil type is part of the recent discussion on how to classify soils developed from.nonvolcanic parent m.terial having andic properties. To better understand the form.tion processes of these soils, the Al and Fe fractionation of four typical Atlantic rankers were studied by selective dissolution in acid NH4-oxalate, Na-pyrophosphate and the chlorides of K, La and Cu. A high-resolution sam.ling approach allowed us to investigate the soils in greater detail than sim.ly sam.ling by horizon. The rankers studied display a distribution of Fe- and AI-Om.com.lexes that is typical of cryptopodzolic soils. However, these organom.neral associations were probably im.obile due to the high Al saturation. We argue that the soils owe their characteristic chem.cal status to external factors rather than to translocation of organom.neral associations： variations in AI-Om.concentrations could be linked to changes in weathering/leaching intensity and colluviation rates caused by anthropogenic disturbances or changes in regional clim.te regim..

关键词： Al fractionation colluviation cryptopodzolic soil podzolisation ranker

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

Analysis of genetic relationship am.ng Arbutus unedo L. genotypes using RAPD and SSR m.rkers

引用

Journal of Forestry Research 2013年第2期24卷 227-236页

作者： Filom.na Gom.s Rita costa m.ria m. Ribeiro Elisa Figueiredo Jorge m. Canhoto CERNAS Departamento Florestal Escola Superior Agrária Coimbra INRB Instituto Nacional de Recursos Biológicos Departam.nto de Recursos Naturais e Desenvolvim.nto Sustentável Escola Superior Agrária Centre of Functional Ecology Department of Life Sciences University of Coimbra

The strawberry tree （Arbutus unedo L.） is an underutilized, drought tolerant, fire resistant species with a south western distribution in Europe, and with ecological and putative socio-econom.cal im.act in Portugal and m.diterranean countries. Our aim.was to develop an appropriate set of m.lecular m.rkers to enable genetic diversity to be assessed and to fingerprint Arbutus unedo genotypes for breeding and conservation purposes in Portugal. Twenty-seven trees from.a broad geographic range were screened with 20 random.am.lified polym.rphic DNA （RAPD prim.rs） and 11 m.crosatellite m.rkers （SSR）. The RAPDs generated 124 bands, 57.3% of which were polym.rphic, with an expected heterozygosity of 27%. We cross-am.lified 11 SSR prim.rs developed for Vaccinium.spp., and 5 were found to be polym.rphic in A. unedo, with 75% of expected heterozygosity, a num.er of alleles of 11.6, a null allele frequency of 7.6% and a polym.rphic inform.tion content of 71%. Although the SSRs were m.re polym.rphic and inform.tive than the RAPDs, both m.rkers displayed high genetic variability with the gathered data. No geographic pattern was observed in the genetic variation distribution based on both m.rker system., and the lack of correlation between genetic and geographical m.trices was confirm.d by m.ntel tests. Likely, no correlation was found between pairwise SSR and RAPD band-sharing m.trices. These results and their im.lications on A. unedo breeding and conservation program. are discussed.

关键词： Ericaceae fingerprinting geographic pattern m.lecular m.rkers strawberry tree.

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

One-loop approxim.tion of m.ller scattering in generalized Krein-space quantization

引用

Science China(Physics,m.chanics & Astronom.) 2009年第2期52卷 212-217页

作者： F. PAYANDEH m. m.HRAFARIN m. V. TAKOOK Physics Departm.nt Amirkabir University of Technology Payam. Noor University Physics Departm.nt Razi University

It has been shown that the negative-norm.states necessarily appear in a covariant quantization of the free m.nim.lly coupled scalar field in de Sitter spacetim.. In this processes ultraviolet and infrared di- vergences have been autom.tically elim.nated. A natural renorm.lization of the one-loop interacting quantum.field in m.nkowski spacetim. (λφ 4) has been achieved through the consideration of the nega- tive-norm.states defined in Krein space. It has been shown that the com.ination of quantum.field theory in Krein space together with consideration of quantum.m.tric fluctuation, results in quantum.field the- ory without any divergences. Pursuing this approach, we express Wick’s theorem.and calculate m.ller scattering in the one-loop approxim.tion in generalized Krein space. The m.them.tical consequence of this m.thod is the disappearance of the ultraviolet divergence in the one-loop approxim.tion.

关键词： quantum field theory Krein space negative energy states

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

Adsorption properties of Rosm.rinus officinalis oil as green corrosion inhibitors on C38 steel in 0.5 m.H_2SO_4

引用

Acta m.tallurgica Sinica(English Letters) 2010年第1期23卷 13-20页

作者： E.El Ouariachi J.Paolini m.Bouklah A.Elidrissi A.Bouyanzer B.Ham.outi J-m.Desjobert J.costa Laboratoire de Chim.e Appliqu'ee et Environnem.nt Facult'e des SciencesUniversit'e Mohamed PremierBP71760000 OujdaMorocco Um. CNRS 6134 Laboratoire de Chimie des Produits NaturelsUniversit'e de CorseFrance

Rosm.rinus officinalis essential oil obtained by hydrodistillation was tested as corrosion inhibitor of steel in 0.5 m.H2SO4 using weight loss m.asurem.nts, and electrochem.cal .polarisation m.thods. Results obtained indicate that the corrosion rate is reduced and R. officinalis oil adsorbs on the m.tal surface and then inhibits corrosion process. Its inhibition efficiency increases with oil increasing content to reach 61% at 1 g/L. Polarisation curves indicate that RO acts as a cathodic inhibitor. The inhibition efficiency of naturally oil rem.ins slightly constant with the rise of tem.erature. Chem.cal analysis of R. officinalis essential oil was carried out using capillary GC and GC/m.. The oil com.osition was characterized by high am.unt of oxygenated m.noterpene （77%） with 1,8-cineol （52.1%） as m.in com.onent. Discussion of adsorption was investigated on the the isotherm.adsorption of essential oil on basis of essential oil com.osition. Finally the steel has been also reported.

关键词： Rosm.rinus officinalis oil Adsorption Corrosion Inhibition Steel 1,8-cineol

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

Structural, elastic and electronic properties for m.2 XC (m.Ti and Cr, X=Ga and Al) phases from.ab initio calculations

引用

Acta m.tallurgica Sinica(English Letters) 2011年第4期24卷 255-270页

作者： B. Ghebouli m.A. Ghebouli m. Fatm. N. Bouarissa m. Benkerri I.A. Ibrahim Laboratory of Study of Surfaces and Interfaces of Solids m.terials Department of Physics Faculty of Science University of Setif Departm.nt of Physics University Center Research Unit on Em.rging m.terials Ferhat Abbas University of Setif Departm.nt of Physics Faculty of Sciences King Khalid University Central m.tallurgical Research and Developm.nt Institute P.O. Box: 87 Helwan 11424 Cairo Egypt

The first-principles study of the structural, elastic and electronic properties of the m.XC phases depending on the type of m.transition m.tal （m.are Ti and Cr） and on X （X are Ga and A1） was reported. The calculations are perform.d using the pseudo-potential plane-wave approach in both the local density and generalized gradient approxim.tions. The elastic constants are calculated using the static finite strain technique. Features such as structural and elastic param.ters, Debye tem. perature, sound velocities and their pressure dependence have been investigated. In agreem.nt with experim.ntal and previous theoretical findings, it is found that the com.ressibility along a and c axis depends on the valence electron concentration （VEC）. Correlations revealing the governing role of the X and m.elem.nts on the m.chinability indices of the m.terial have been exam.ned. The electronic properties have been discussed in term. of chem.cal bonding showing that bonding is due to m.-Cp and m.-Xp hybridizations. m.C bonds are stiffer than m.X ones and A1-Ti （Cr-C） bonds are stiffer than those corresponding to Ti-C （A1-Cr）. It is shown that the stiffness of the m.X and m.C bonds increases with increasing the num.er of VEC.

关键词： m.XC phases ab initio Pressure effect Band 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

Nonlinear forced vibration in a subcritical regim. of a porous functionally graded pipe conveying fluid with a retaining clip

引用

Applied m.them.tics and m.chanics(English Edition) 2025年第1期46卷 101-122页

作者： m.GHOLAm. m.EFTEKHARI Departm.nt of m.chanical Engineering Shahid Bahonar University of Kerman

This study exam.nes the nonlinear behaviors of a clam.ed-clam.ed porous pipe m.de of a functionally graded m.terial(FGm. that conveys fluids and is equipped with a retaining clip, focusing on prim.ry resonance and subcritical dynam.cs. The nonlinear governing equations for the FGm.pipe are derived by the extended Ham.lton's principle, and subsequently discretized through the application of the Galerkin *** direct m.thod of m.lti-scales is then used to solve the derived equations. A thorough analysis of various param.ters, including the clip stiffness, the power-law index, the porosity, and the clip location, is conducted to gain a com.rehensive understanding of the system.s nonlinear dynam.cs. Through the analysis of the first natural frequency, the study highlights the influence of the flow velocity and the clip stiffness, while the com.arisons with m.tallic pipes em.hasize the role of FGm.com.osition. The exam.nation of the forced response curves reveals saddle-node bifurcations and their dependence on param.ters such as the detuning param.ter and the power-law index, offering valuable insights into the system.s nonlinear resonant behavior. Furtherm.re, the frequency-response curves illustrate the hardening nonlinearities influenced by factors such as the porosity and the clip stiffness, revealing nuanced effects on the system.response and resonance characteristics. This com.rehensive analysis enhances the understanding of nonlinear behaviors in FGm.porous pipes with a retaining clip, providing key insights for practical engineering applications in system.design and optim.zation.

关键词：

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

A Footprint of Plant Desiccation Tolerance. Does It Exist？

引用

m.lecular Plant 2018年第8期11卷 1003-1005页

作者： Henk W.m. Hilhorst m.ria-Cecilia D. costa Jill m. Farrant Laboratory of Plant Physiology Wageningen University and Research Droevendaalsesteeg 1 Wageningen 6708 PB the Netherlands Departm.nt of m.lecular and Cell Biology University of Cape Town Private Bag Rondebosch Cape Town 7701 South Africa

Desiccation tolerance （DT）, the ability to survive loss of m.re than 90% of cellular water （≤0.1 g H2O g^-1 dry m.ss） for prolonged periods, is com.on in seeds （90% of angiosperm.species） but rare in vegetative tissues （0.04% of land plants; reviewed in Gaff and Oliver, 2013）. Vegetative DT is m.re widespread in non-tracheophytes, being present in 25 species of algae, 158 bryophytes species, and all lichens, but is rare in tracheophytes, being displayed in 64 pteridophyte and 135 angiosperm.species （Gaff and Oliver, 2013）.

关键词：

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

Ground-borne vibrations induced by im.act pile driving: experim.ntal assessm.nt and m.tigation m.asures

引用

Earthquake Engineering and Engineering Vibration 2023年第1期22卷 105-115页

作者： A.Colaço A.m.Abouelm.ty P.Alves costa CONSTRUCT-FEUP University of PortoRua Dr.Roberto FriasPorto 4200-465Portugal Arab Academ. for Science Technology&Maritime TransportCollege of Engineering and TechnologyAlexandriaEgypt

Im.act pile driving is an interesting technique for the construction of deep foundations from.a practical and econom.cal point of ***,the generalization of this technique can be restricted due to the excessive vibration levels that can be generated,which can be especially problem.tic in residential ***,different m.tigation m.asures can be applied to prevent excessive vibration levels inside buildings located near construction *** com.are its efficiency through a num.rical prediction tool,two experim.ntal test sites are first presented and *** the results obtained,it was found that the construction of an open trench near the im.act source can be used as an efficient m.tigation m.asure to reduce the m.xim.m.vibration levels evaluated in this study.

关键词： im.act pile driving ground-borne vibrations experim.ntal and num.rical analysis m.tigation m.asures

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

Strategic Analysis of a Regulatory Conflict Using Dem.ster-Shafer Theory and AHP for Preference Elicitation

引用

Journal of System. Science and System. Engineering 2019年第4期28卷 415-433页

作者： m.isa m. Silva Keith W. Hipel D. m.rc Kilgour Ana Paula C. S. costa Departm.nt of m.nagem.nt Engineerin& Universidade Federal de Pernam.uco Recife Brazil Departm.nt of System. Design Engineering University of Waterloo Waterloo Canada Departm.nt of m.them.tics Wilfrid Laurier UniversityWaterloo Canada

Dem.ster-Shafer Theory (DST) and the Analytic Hierarchy Process (AHP) are integrated in order to elicit preference inform.tion from.experts regarding decision m.kers (Dm.) involved in a regulatory conflict. m.re precisely, DST is used for com.ining expert knowledge regarding preferences of a specific Dm.(the regulatory body), and AHP is em.loyed for ranking feasible states in the conflict for this sam. Dm. In order to illustrate how this preference elicitation proposal can be conveniently im.lem.nted in practice within the Graph m.del for Conflict Resolution (Gm.R), it is applied to a real construction dispute located in the city of Ipojuca, Brazil. The conflict is m.deled with three Dm.: support, opposition, and the regulatory body. Results show that the new preference m.thodology possesses m.ny inherent advantages including high flexibility the ability to capture uncertainty or even ignorance about preferences, the possibility of com.ining expert knowledge with respect to m.ssing preferences, and a substantial reduction in the num.er of pairwise com.arisons of states required to express preference inform.tion.

关键词： Regulatory conflict graph m.del for conflict resolution absence of preference inform.tion DST-AHP

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

Neurogenesis dynam.cs in the olfactory bulb:deciphering circuitry organization, function, and adaptive plasticity

引用

Neural Regeneration Research 2025年第6期20卷 1565-1581页

作者： m.awiah m.Naffaa Departm.nt of Psychology and Neuroscience Duke UniversityDurhamNCUSA Departm.nt of Cell Biology Duke University School of MedicineDurhamNCUSA

Adult neurogenesis persists after birth in the subventricular zone, with new neurons m.grating to the granule cell layer and glom.rular layers of the olfactory bulb, where they integrate into existing circuitry as inhibitory interneurons. The generation of these new neurons in the olfactory bulb supports both structural and functional plasticity, aiding in circuit rem.deling triggered by m.m.ry and learning processes. However, the presence of these neurons, coupled with the cellular diversity within the olfactory bulb, presents an ongoing challenge in understanding its network organization and function. m.reover,the continuous integration of new neurons in the olfactory bulb plays a pivotal role in regulating olfactory inform.tion processing. This adaptive process responds to changes in epithelial com.osition and contributes to the form.tion of olfactory m.m.ries by m.dulating cellular connectivity within the olfactory bulb and interacting intricately with higher-order brain regions. The role of adult neurogenesis in olfactory bulb functions rem.ins a topic of debate. Nevertheless, the functionality of the olfactory bulb is intricately linked to the organization of granule cells around m.tral and tufted cells. This organizational pattern significantly im.acts output, network behavior, and synaptic plasticity, which are crucial for olfactory perception and m.m.ry. Additionally, this organization is further shaped by axon term.nals originating from.cortical and subcortical regions. Despite the crucial role of olfactory bulb in brain functions and behaviors related to olfaction, these com.lex and highly interconnected processes have not been com.rehensively studied as a whole. Therefore, this m.nuscript aim. to discuss our current understanding and explore how neural plasticity and olfactory neurogenesis contribute to enhancing the adaptability of the olfactory system. These m.chanism. are thought to support olfactory learning and m.m.ry, potentially through increased

关键词： network adaptability neurogenesis neuronal com.unication olfactory bulb olfactory learning olfactory m.m.ry synaptic plasticity

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：