检索结果-南通市图书馆

Vegetable production After Flooded Rice Improves Soil properties in the Red River Delta, Vietnam

在线全文

学校读者我要写书评

暂无评论

pedosphere 2015年第1期25卷 130-139页

作者： Arij p.EVERAARTS jacques j.NEETESON pham T.T.HUONG paul C.STRUIK Applied plant Research Wageningen University and Research Centre plant Research International Wageningen University and Research Centre Field Crop Research Institute Hai Duong and Hanoi University of Agriculture Centre for Crop Systems Analysis Wageningen University

Vegetable production in South East Asia often is in rotation with flooded rice. The puddling of the soil with flooded rice production may result in unfavourable soil conditions for the subsequent production of dry land crops. To establish whether permanent vegetable production results in favourable soil conditions for vegetables, the effects of five different permanent vegetable production systems and a system of vegetable production in rotation with flooded rice on soil properties after flooded rice were studied in a 2-year field experiment. Bulk density at 0.05–0.10 m depth layer decreased with permanent vegetable production and vegetable production in rotation with flooded rice. The decrease in bulk density was influenced by the application of organic manure and rice husks, and especially by the number of crops cultivated, suggesting that frequency of soil tillage had a major effect on bulk density. ploughing with buffalo traction after flooded rice, in combination with construction of raised beds, could reduce or totally eliminate negative effects of puddling on soil structure. Bulk density at 0.15–0.20 m soil depth was not influenced. Soil acidity decreased significantly in all systems. Soil organic carbon increased in all systems, but significant increase was only found in two permanent vegetable production systems. Available phosphorus(p) significantly increased in two permanent vegetable production systems, with a positively correlation to the amount of p applied. The significant decrease in bulk density and increase in p H(H2O), after only 2 years, showed that soil conditions after flooded rice could be improved in a short time under intensive vegetable production.

关键词： available phosphorus bulk density organic carbon puddling soil fertility soil improvement

Sperm traits differ between winged and wingless males of the ant Cardiocondyla obscurior

在线全文

学校读者我要写书评

暂无评论

Integrative Zoology 2016年第6期11卷 427-432页

作者： Alexandra SCHREMpF Astrid MOSER jacques DELABIE jürgen HEINZE Zoology/Evolutionary Biology University of RegensburgRegensburgGermany Myrmecological Laboratory Cocoa Research Center CEPLACItabunaBrazil

Size and shape of sperm cells vary tremendously throughout the animal *** adaptive significance of this variation is not fully *** addition to sperm-female interactions and the environmental conditions,the risk of sperm competition might affect number,morphology and other“quality”traits of *** the male-diphenic ant Cardiocondyla obscurior,winged sneaker males have limited sperm number,because their testes degenerate shortly after adult emergence,as is typical for males of social *** contrast,wingless fighter males continuously replenish their sperm supply due to their exceptional lifelong spermatogene*** winged males usually have to compete with several other winged males for virgin queens,wingless males are able to monopolize queens by killing all other ***,this presents a unique system to investigate how alternative reproductive tactics and associated physiology affect sperm morphology and *** found that sperm-limited males invest into sperm number instead of sperm *** in sperm length is smaller in winged males,probably reflecting that they have to compete with several other ***,sperm viability is equally high in both male phenotypes.

关键词： alternative reproductive tactic social insect sperm length sperm viability

How everything started:A retrospective

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Geoscience Frontiers 2014年第5期5卷 627-634页

作者： jacques Touret Institut de Mineralogie.de physique des Materiaux.et de Cosmochimie IMpMC).Sorbonne Universites-UpMC Univ paris 06 UMR CNRS 7590 Museum National d'Histoire Naturelle.IRD UMR 206.4 place jussieu F-75005 paris France

Recalling some of the most important events and persons during his education and career, the author sketches his growth from a young engineer, educated in the sanctuary of solid state reactions, to an involved fully devoted scientific career for the study of fluids in the deep Earth. Most important in this respect was the discovery of C02 inclusions in granulites, which triggered years of discussion on fluid- absent or fluid-assisted granulite metamorphism. To some extent, this debate is a continuation of the former granite controversy, but it shows also how the famous battle of ＂soaks against pontiffs＂ could have been easily avoided.

关键词： Granite controversyMetamorphic petrologyFluid inclusionsj TouretGranulites

A unified plasticity methodology for rate-and temperature-sensitive alloys exhibiting a non-linear kinematic hardening behavior

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Solida Sinica 2017年第1期30卷 27-37页

作者： jacques Luk-Cyr Daniel paquet jacques Lanteigne Henri Champliaud Aurelian Vadean Department of Mechanical Engineering Ecole Polyechnique de Montreal 2900 Blvd Edouard-Montpetit MontrealQC H3T 1J4 Institut de recherche d'Hydro-Quebec 1800 Blvd Lionel-Boulet Varennes QC J3X 1S1 Department of Mechanical Engineering Ecole de technologie superieure 1100 Rue Notre-Dame O Montreal QCH3C 1K3

In this paper, a novel unified plasticity methodology is proposed to allow the coupling of rate-and temperature-sensitivity of engineering alloys as well as the non-linear kinematic hardening behavior often observed during cyclic loading. The proposed methodology is general in the sense that an arbitrary constitutive model may be chosen for the viscoplastic part, as well as the cyclic part. We adapt our model with a physically-motivated viscoplasticity flow rule and a nonlinear kinematic hardening model. In contrast with other unified plasticity models, the simplified theory involves few material parameters that can be readily calibrated from standard mechanical tests. The capabilities of the proposed theory are demonstrated for a hot rolled annealed 304 L stainless steel supplied by Vimetal peckover. The model is tested with stress–strain curves obtained from standard tensile and cyclic uniaxial tests at various strain amplitudes and strain-rates, and good accuracy of the response is obtained for strains up to 15%, within a temperature range of 293–673 K. We note that the cyclic plasticity model in our adapted theory can be readily enhanced with ratchetting, mean stress relaxation, strain amplitude history, Masing effects or other complex capabilities.

关键词： Unified plasticity Constitutive behavior Viscoplasticity Non-linear kinematic hardening Stainless steels

Conic hyperspectral dispersion mapping applied to semiconductor plasmonics

在线全文

学校读者我要写书评

暂无评论

Light(Science & Applications) 2012年第1期1卷 48-55页

作者： Dominic Lepage Alvaro jimenez jacques Beauvais jan j Dubowski Department of Electrical and Computer Engineering Interdisciplinary Institute for Technological Innovation(3IT)Universite´de SherbrookeSherbrookeQue´.Canada

The surface plasmon resonance tracking over metal surfaces is a well-established,commercially available,biochemical quantification tool primarily applied in *** utilization of such a tool is,however,constrained to highly specialized industries,capable of justifying the human and instrumental resource investments required by the characterization *** have proposed to expand the field of application of this biosensing approach by redesigning this method through the integration and miniaturization within a semiconductor *** and broadband emission from a light-emitting semiconductor is employed to couple a continuum of surface plasmon modes over a metal–dielectric architecture interfaced with a GaAs–AlGaAs substrate.A tensor version of rigorous coupled wave theory is employed to optimize the various fabrication specifications and to predict the light scatterings over a wide range of *** then present a hyperspectral characterization microscope capable of directly mapping the dispersion relation of scattered light,including diffracted surface plasmons,as an intensity distribution versus photon energy and surface *** carried out in a buffered solution demonstrate the accurate description of the uncollimated and broadband surface plasmon ***,we introduce a simplified method of dispersion mapping,in which quasi-conic cross-sections of the light’s scattering can be acquired directly,thus monitoring surficial responses in as fast as 1.2 *** is over 300 times faster than required by implementing full dispersion *** compromising on the volume of collected information,this method,combined with the solid-state integration of the platform,shows great promise for the fast detection of biochemical agents.

关键词： biosensors light scattering optical devices semiconductors surface plasmon resonance

Real-time detection of influenza A virus using semiconductor nanophotonics

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Light(Science & Applications) 2013年第1期2卷 184-191页

作者： Dominic Lepage Alvaro jimenez jacques Beauvais jan j Dubowski Laboratory for Quantum Semiconductors and photon-based BioNanotechnology Interdisciplinary Institute for Technological Innovation(3IT)Department of Electrical and Computer EngineeringUniversite´de SherbrookeSherbrookeQC J1K 2R1Canada

Modern miniaturization and the digitalization of characterization instruments greatly facilitate the diffusion of technological advances in new fields and generate innovative *** concept of a portable,inexpensive and semi-automated biosensing platform,or lab-on-a-chip,is a vision shared by many researchers and venture *** this scope,we present a semiconductor monolithic integration approach to conduct surface plasmon resonance *** technology is already commonly used for biochemical characterization in pharmaceutical industries,but we have reduced the technological platform to a few nanometers in scale on a semiconductor *** evaluate the signal quality of this nanophotonic device using hyperspectral-imaging technology,and we compare its performance with that of a standard prism-based commercial *** standard biochemical agents are employed for this characterization study:bovine serum albumin and inactivated influenza A *** resolutions of data acquisition varying between 360 and 2.2 s are presented,yielding 2.731025–1.531026 RIU resolutions,respectively.

关键词： GaAs/AlGaAs quantum well device hyperspectral imaging technology influenza A virus integrated surface plasmon resonance biosensor

A Large-Scale palaeozoic Dextral Ductile Strike-Slip Zone:the Aqqikkudug-Weiya Zone along the Northern Margin of the Central Tianshan Belt,Xinjiang,NW China

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 Geologica Sinica(English Edition) 1999年第2期73卷 148-162页

作者： CHARVET jacques Departement des Sciences de la Terre URM6530Universite d'Orleans45067 OrleansFrance

Abstract The nearly E-W-trending Aqqikkudug-Weiya zone, more than 1000 km long and about 30 km wide, is an important segment in the Central Asian tectonic framework. It is distributed along the northern margin of the Central Tianshan belt in Xinjiang, NW China and is composed of mylonitized Early palaeozoic greywacke, volcanic rocks, ophiolitic blocks as a mélange complex, Hp/LT-type bleuschist blocks and mylonitized Neoproterozoic schist, gneiss and orthogneiss. Nearly vertical mylonitic foliation and sub-horizontal stretching lineation define its strike-slip feature; various kinematic indicators, such as asymmetric folds, non-coaxial asymmetric macro- to micro-structures and C-axis fabrics of quartz grains of mylonites, suggest that it is a dextral strike-slip ductile shear zone oriented in a nearly E-W direction characterized by “flower” strusture with thrusting or extruding across the zone toward the two sides and upright folds with gently plunging hinges. The Aqqikkudug-Weiya zone experienced at least two stages of ductile shear tectonic evolution: Early palaeozoic north vergent thrusting ductile shear and Late Carboniferous-Early permian strike-slip deformation. The strike-slip ductile shear likely took place during Late palaeozoic time, dated at 269±5 Ma by the40Ar/39Ar analysis on neo-muscovites. The strike-slip deformation was followed by the Hercynian violent S-type granitic magmatism. Geodynamical analysis suggests that the large-scale dextral strike-slip ductile shearing is likely the result of intracontinental adjustment deformation after the collision of the Siberian continental plate towards the northern margin of the Tarim continental plate during the Late Carboniferous. The Himalayan tectonism locally deformed the zone, marked by final uplift, brittle layer-slip and step-type thrust faults, transcurrent faults and E-W-elongated Mesozoic-Cenozoic basins.

关键词： ductile thrusting dextral strike-slipping kinematic analysis Aqqikkudug-Weiya zone Tianshan palaeozoic orogenic belt

Adult size and tinning of reproduction in five species of Asobara parasitoid wasps

在线全文

学校读者我要写书评

暂无评论

Insect Science 2020年第6期27卷 1334-1345页

作者： Majeed Askari Seyahooei Ken Kraaijeveld Abdoolnabi Bagheri jacques j.Mvan Alphen plant protection Research Department Hormozgan Agricultural and Natural Resources Research and Education CenterAgricultural Research Education and Extension Organization(AREEO)Bandar AbbasIran Faculty of Earth and Life Sciences Institute of Ecological ScienceAnimal EcologyVrije University AmsterdamAmsterdamthe Netherlands Institute for Biodiversity and Ecosystem dynamics University of AmsterdamAmsterdamthe Netherlands

The majority o f adult parasitoid wasps are unable to synthesize lipids and therefore face a trade-off between the investment of lipids in eggs or in the maintenance of *** has been shown that resource allocation should depend on body size in *** that smaller females have shorter expected life times,they should concentrate their reproductive effort into early *** test this prediction,we investigated the relationship between body size and the timing of egg production in *** measured body size,lipid reserves,and reproductive investment(number of eggs,ovigeny index equivalent[OIE]and egg size)at eclosion in five species of Asobara(Hymenoptera:Braconidae)originating from different geographic and climatic *** results show significant interspecific variation in all these traits.A diagnostic test for phylogenetic independence revealed that closely related species did not resemble each other more closely than expected by chance for all traits *** reserves scaled positively with body size both between and within *** agreement with theory,01 correlated negatively with body size both between and within *** egg area at eclosion correlated negatively with lipid reserves both between and within *** indicates the existence of a trade-off between allocation of lipids to current reproduction and survival/future *** the exception of the most extreme pro-ovigenic species,*** im ilis,we found that proovigeny was compensated for by small egg *** results indicate the role of habitats in shaping interspecific variation in resource allocation strategies.

关键词： hymenopterous parasitoids lipid reserve ovigeny index equivalent reproduction strategy resource allocation

SYNTHESIS OF CONDUCTIVE pOLYANILINE VIA OXIDATION BY MnO_2

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese journal of polymer Science 2004年第3期22卷 269-277页

作者：生瑜 Christian Carrotc jacques Guilletc Institute of Materials Science and Engineering East China University of Science and Technology Shanghai 20023 China Laboratoire de Rheologie des Matieres plastiques FRE CNRS 2396 Universite Jean Monnet 42023 St-Etienne Cedex 2 France

A unique process of chemical oxidation polymerization of aniline using manganese dioxide (MnO2) as the oxidizing agent in an aqueous medium is described. The reaction between aniline and MnO2 follows a mechanism by which the organic monomer is oxidized while the metal oxide undergoes reductive dissolution. The effects of the amount of oxidizing agent and aniline, pH and temperature of the reactive system, type of acid on the yield and conductivity of polyaniline are discussed. The resulting polyaniline was characterized by IR and UV-Vis spectrometry. polyaniline with a conductivity of 12.5 S/cm was obtained using 0.033 mol of aniline oxidized by 0.023 mol MnO2 in the presence of 100 mL of 2.7 mol/L HCl at 25degreesC for 4 h.

关键词： conducting polymers heteroatom-containing polymers manganese oxide oxidation polymerization polyaniline