检索结果-南通市图书馆

Effects of finite water depth and lateral confinement on ships wakes and resistance

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2020年第3期32卷 582-590页

作者： Clément Caplier Germain Rousseaux Damien Calluaud laurent David Institut Pprime-CNRS University of PoitiersISAE-ENSMAChasseneuilFrance

Wash waves produced by ships disintegrate river banks and coastal lines. This phenomenon of bank erosion is mainly due to the height of the waves. Various factors govern the formation of these waves and their amplitudes: the geometry of the water channel, the shape and the speed of the boat, etc.. These factors play an important role on the wave generation, in addition on the resistance of the ship and so on its fuel consumption. Whether to study the impact of wash waves on the ship's environment or its resistance, the analysis of the generated wake is essential. Hence a fine characterization of the wave field is necessary. This study proposes a comparison of wakes generated by two generic ships based on a Wigley hull with block coefficients 0.67 and 0.89 respectively representative of maritime and fluvial ships. The wakes generated in deep water and confined water configurations have been measured for different froude numbers by a non-intrusive optical stereo-correlation method, giving access to a detailed and complete definition of the generated wave fields. The resistance of the ship hulls has been measured in deep and confined water configurations with a hydrodynamic balance. The results permit one to study the influence of both hull and water channel geometries on the ship wake, on the amplitude of the far-field generated waves and on the near-field hydrodynamic response. Moreover, resistance curves are obtained for both configurations and highlight the effect of both hull and water channel geometries on the resistance coefficient of the ship. A comparison of the resistance curves with or without the ship trim is conducted and shows the influence of the trim on the resistance coefficient in the different ship speed regimes.

关键词： Ship wakes wash waves confined water ship resistance

Plasma phospholipid transfer protein (PLTP) as an emerging determinant of the adaptive immune response

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Cellular & Molecular Immunology 2018年第12期15卷 1077-1079页

作者： Catherine Desrumaux laurent Lagrost UniversitéMontpellier Montpellier F-34095France Team‘Environmental Impacts in Alzheimer’s Disease and Related Disorders’(EiAlz) InsermU1198Montpellier F-34095France EPHE Paris F-75007France LipSTIC LabEx Fondation de Coopération Scientifique Bourgogne-Franche ComtéDijon F-21000France INSERM LNC UMR1231Dijon F-21000France University Bourgogne franche-Comté LNC UMR1231Dijon F-21000France

Plasma phospholipid transfer protein(PLTP)is a multifunctional lipid *** addition to phospholipids,PLTP transports various amphipathic compounds,such as cholesterol,alphatocopherol,diacylglycerides,and *** addition to its impact on lipid metabolism and atherosclerosis development,PLTP has recently been reported to modulate inflammation and immune *** modulates the phagocytic activity of macrophages and microglial cells1,2 and increases the production of the pro-inflammatory cytokine interleukin 6(IL-6).3–5 In further support of the pro-inflammatory effect of PLTP,the expression level of IL-6 and the number of infiltrating macrophages in aortic tissue after experimental aneurysm induction were shown to be lower in PLTP-deficient mice than in wild-type mice;6 additionally,recombinant PLTP was shown to exert a direct pro-inflammatory effect on rheumatoid arthritis fibroblast-like synoviocytes,independent of its lipid transfer activity.7 Notably,despite its direct pro-inflammatory actions,PLTP can exert indirect antiinflammatory actions through its ability to transport and detoxify lipopolysaccharides in gram-negative bacteria.8,9 In humans,the majority of PLTP-associated proteins are involved in innate immunity and/or the inflammatory response in plasma,and PLTP activity is significantly increased in patients with bacterial infections and systemic *** addition to the key roles of PLTP in innate immunity,a recent publication from our group entitled“Plasma phospholipid transfer protein(PLTP)modulates adaptive immune functions through alternation of T-helper-cell polarization”10 demonstrated for the first time that PLTP can also modulate adaptive immune *** modulation occurred through a profound effect on CD4+T-cell polarization toward the pro-inflammatory Th1 *** novel property also supports the pro-inflammatory and pro-atherogenic effects of PLTP(fig.1).

关键词： PLTP immunity metabolism

Characterization of the geometric properties of the sclero-conjunctival structure: a review

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2020年第9期13卷 1484-1492页

作者： laurent Bataille David P Pinero Research and Development Department VISSUMAlicante 03016Spain Group of Optics and Visual Perception Department of OpticsPharmacology and AnatomyUniversity of AlicanteAlicante 03690Spain

To revise the peer-reviewed literature on geometric properties of the scleral-conjunctival structure in order to define their clinical relevance and the potential relationship between their changes and myopia development or progression.A bibliographic search focused on the study of the geometry of conjunctiva and/or sclera as well as those studies evaluating the relationship between geometric changes in the scleral-conjunctival structure and myopia was carried *** studies have been performed with different diagnostic technologies,including optical coherence tomography,profilometry and Scheimpflug imaging,to detect geometric changes of the scleralconjunctival tissue in different physiological conditions of the eye,after use of contact lenses and in different ocular ***,these technologies have been shown to be a valuable clinical tool to optimize scleral contact lens *** studies should investigate new potential clinical applications of such technologies,including the evaluation of anterior scleral changes related to myopia,as well as to define standardized clinical standard operating procedures for obtaining accurate and reproducible clinical measurement of the scleral-conjunctival morphology.

关键词： conjunctiva sclera profilometry myopia scleral topography

Strain engineering of electro-optic constants in ferroelectric materials

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

npj Computational Materials 2019年第1期5卷 1092-1096页

作者： Charles Paillard Sergei Prokhorenko laurent Bellaiche Department of Physics and Institute for Nanoscience and Engineering University of ArkansasFayettevilleAR 72701USA

Electro-optic effects allow control of the ow of light using electric fields,and are of utmost importance for today’s information and communication technologies,such as TV displays and fiber *** search for large electro-optic constants in films is essential to the miniaturization and increased efficiency of electro-optic *** this work,we demonstrate that strain-engineering in PbTiO_(3) films allows to selectively choose which electro-optic constant to *** electro-optic constants larger than 100 pm V^(−1) are predicted,either by driving the softening of an optical phonon mode at a phase transition boundary under tensile strain,or by generating the equivalent of a negative pressure via compressive strain to obtain large piezoelectric *** particular,a r_(13) electro-optic coefficient twice as large as the one of the commonly used LiNbO_(3) electro-optic material is found here when growing PbTiO_(3) on the technologicallyimportant Si substrate.

关键词： softening constants ferroelectric

Endophyte infection of festuca eskia enhances seedling survival to drought and cutting at the expense of clonal expansion

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Plant Ecology 2011年第4期4卷 201-208页

作者： Anaïs Gibert laurent Hazard Institut National de la Recherche Agronomique UMR 1248 AGIR31320 Castanet TolosanFrance

Symbiotic relationships between fungal endophytes and grass species are known to increase stress resistance in the grass host;however,there is little evidence to suggest that the positive effects occur early in the grass life *** this study,we explored the effects of the endophyte Epichloe¨festucae on the growth and survival of festuca eskia seedlings under drought and frequent cutting *** festuca eskia seedlings were collected from the western part of the plant repartition area in a non-symbiotic population located in a mesic and heavily grazed site(W-NS)and from the eastern part in a symbiotic population from a xeric and lightly grazed site(E-S).The E-S population was experimentally freed from its endophyte(E-f).Two greenhouse experiments were conducted to compare growth and survival between the three seedling types under drought stress and frequent *** the first experiment,126 seedlings per seedling type(n=378)were grown for 6 weeks under non-limiting conditions before the cessation of *** 3 weeks without irrigation,full irrigation was restored for 10 days to measure the survival *** length,leaf elongation rate and survival rate were assessed per *** the second experiment,156 seedlings per seedling type(n=468)were grown under non-limiting *** seedlings were cut to 3 cmhigh,twice a week,during the first month of *** elongation and tillering were monitored on 52 seedlings per seedling *** each type,seedling survival rate was determined by the number of plants alive after 10 days of regrowth,without *** findings The drought experiment revealed a phenotypic differentiation to drought in 30 *** populations,suggesting adaptive differentiation:the eastern seedlings showed the highest survival rate.A tradeoff between growth and survival was highlighted:the highest drought survival rate was associated with the lowest leaf elongation rate under non-limiting water ***

关键词： Epichloëfestucae water stress cutting fitness native grass mutualism

Dynamics of Strigolactone function and Shoot Branching Responses in Pisum sativum

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Molecular Plant 2013年第1期6卷 128-140页

作者： Elizabeth A. Dun Alexandre de saint Germain Catherine Rameau Christine A. Beveridge The University of Queensland School of Biological Sciences St Lucia QLD 4072 Australia Institut Jean-Pierre Bourgin INRA UMR1318 INRA-AgroParisTech F-78000 Versailles France

Strigolactones （SLs）, or their metabolites, were recently identified as endogenous inhibitors of shoot branch- ing. However, certain key features and dynamics of SL action remained to be physiologically characterized. Here we show that successive direct application of SL to axillary buds at every node along the stem can fully inhibit branching. The SL inhibition of early outgrowth did not require inhibitory signals from other growing buds or the shoot tip. In add- ition to this very early or initial suppression of outgrowth, we also found SL to be effective, up to a point, at moderating the continuing growth of axillary branches. The effectiveness of SL at affecting bud and branch growth correlated with the ability of SL to regulate expression of PsBRC1. PsBRC1 is a transcription factor that is expressed strongly in axillary buds and is required for SL inhibition of shoot branching. Consistent with a dynamic role of the hormone, SL inhibition of bud growth did not prevent buds from later responding to a decapitation treatment, even though SL treatment immediately after decapitation inhibits the outgrowth response. Also, as expected from the hypothesized branching control network in plants, treatment of exogenous SL caused feedback down-regulation of SL biosynthesis genes within 2 h. Altogether, these results reveal new insights into the dynamics of SL function and support the premise that SLs or SL-derived metabolites function dynamically as a shoot branching hormone and that they act directly in axillary buds.

关键词： hormonal regulation dormancy shoot branching.

Politics and banking:A survey of the recent literature

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Economic and Political Studies 2022年第3期10卷 342-352页

作者： laurent Wei EM Strasbourg Business School University of StrasbourgStrasbourgFrance

This survey aims at briefly summarising key findings of the recent literature dealing with politics and *** interplay between banks and politics has received increasing interest in recent years following Dinc(2005)on the influence of elections on bank *** focusses on two questions:the influence of elections on bank behaviour,and the interconnections between democracy and *** key findings emerge from the ***,elections exert an influence on the banking *** affect bank lending and bank failures,with electoral cycles leading to economic ***,democracy has a beneficial impact on the credit conditions of *** work provides a roadmap for future research to investigate the political interfer-ence in private banks’behaviour and in developed countries.

关键词： Elections political regime banking bank failures lending

Analyzing excited-state processes and optical signatures of a ratiomeric fluorine anion sensor: a quantum look

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 2014年第10期57卷 1363-1368页

作者： laurent Adèle D. JACQUEMIN Denis CEISAM UMR CNRS 6230 BP 92208 Universitè de Nantes 2 Rue de la Houssinière44322 Nantes Cedex 3 France Institut Universitaire de france 103 bd St Michel75005 Paris Cedex 5 France

Recently, the spectroscopic signatures of a benzoselenadiazole derivative have been investigated in the framework of designing a new ratiometric fluoride sensor （Saravanan et al., Org Lett, 2014, 16： 354-357）. It was suggested that this sensor is un- dergoing excited-state intramolecular proton transfer. In this work, we provide a new look at these experimental data, using a state-of-the-art time-dependent density fimctiona/theory approach to mimic the spectroscopic signatures. New insights about the nature of the excited-state processes are obtained.

关键词： excited-state intramolecular proton transfer (ESIPT) time-dependent density functional theory (TD-DfT) benzoselenadiazole

Sedimentary facies and paleoenvironmental interpretation of a Holocene marsh in the Gironde Estuary in france

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

Acta Oceanologica Sinica 2006年第6期25卷 52-62页

作者： WANG Jianhua MASSE laurent TASTET Jean -Pierre Department of Earth Sciences Sun Yat-sen （Zhongshan） University Guangzhou 510275 China Départment de Géologie et Océanographie Université Bordeaux I 33405 Talence cédèx France

The Monards Marsh is located on the northeastern bank of the Gironde Estuary in france. Lithological, sedimentolngical and mi- cropalacontological investigations were made on four cores to determine the evolution of Holocene sedimentary environments and processes in this area over the last 6 000 a. Three main lithological facies are distinguished from bottom to top：（ 1 ） grey laminated silty-sandy clay ; （2） homogeneous dark grey silty clay ; and （ 3 ） compact silty clay. About 26 benthic foraminifera species are identified and divided into six groups according to their ecological characteristics. In association with lithology, sedimentary structures and grainuiometry, the distribution of foraminifera group is used to define external slikke, internal slikke, external schorre, internal schorre, and continental marsh facies. Combined with 14C（AMS） dating, these data indicate four successive paleoenvironments in the Monards Marsh：（ 1 ） Holocene transgression resuited in the development of a basal schorre facies overlying fluvial deposits that transformed to slikke facies sedimentation; the transgression maximum occurred around 5 600 to 5 4430 a BP and was inferred to be associated with the last phase of the rapid Holocene sea-level rise; （2） post-trangressive maximum sedimentation resuited in a regressive sequence of deposits prograding towards the estuary, corresponding to the stahilisation of sea level after 5 4430 a BP; （3） a slight positive tendency in the sea level around 2 800 a BP recorded in the central part of the marsh; and （4） the wetland to a continental marsh environment. The sequential pattern for the evolution of wetlands in this estuarine area during the Holocene is fluvial facies - blackish schorre facies - slikke facies - blackish schorre facies - continental marsh facies. Characteristics of sedimentary facies distribution and evolution reveal that the development of Holocene salt marsh in this area was controlled by the sea-level change and tidal r

关键词： marsh sedimentation benthic foraminifera,^ 14C dating Holocene sea-level fluctuation paleoenvironment