检索结果-南通市图书馆

Honeydew volatile emission acts as a kairomonal message for the Asian lady beetle Harmonia axyridis （Coleoptera： Coccinellidae）

引用

Insect Science 2012年第4期19卷 498-506页

作者： Pascal D. Leroy Stephanie Heuskin Ahmed Sabri Fran( ois j. verheggen j.lien Farmakidis Georges Lognay Philippe Thonart j.an-Paul Wathelet Yves Brostaux Eric Haubruge Departments of Functional and Evolutionary Entomology Departments of Analytical Chemistry University of Liege Gembloux Agro-BioTech Walloon Center of Industrial Biology University of Liege B40 4000 Sart-Tilman Departments of General and Organic Chemistry Departments of Appfied Statistics Computer Science and Mathematics University of Liege Gembloux Agro-Bio Tech Gembloux Belgium

The Asian lady beetle Harmonia axyridis Pallas is considered as an invasive species in most territories where it has been introduced. Because aphid honeydew acts as an attraetant for many aphid predators and parasitoids, the obj.ctives of this work were to collect and identify the volatile compounds released from the aphid excretory product to evaluate how these semiochemicals could affect the H. axyridis foraging behavior. Twelve volatile chemicals were identified from the Megoura viciae Buckton honeydew including four alcohols, three ketones, three aldehydes, a pyrazine and a monoterpene. The volatiles 3-methyl-l-butanol and 3-methyl-butanal were highlighted as the two most abundant semiochemicals released from the M. viciae honeydew. Vieia faba L. plants treated with crude honeydew attracted more than 80% of the tested individuals with 40% of attracted beetles located on the plant. Four volatile compounds （3-hydroxy-2-butanone, 3-methyl-butanal, 3-methyl-1-butanol and limonene） were also highlighted to attract more than 75% of the coccinellids toward the odor source and to locate about 35% of them on the plants. Limonene was the most efficient attractant since 89% of the H. axyridis responded to this odor. The use of the identified semiochemicals as well as the composition of an artificial honeydew could certainly be helpful to control the dispersal of the Asian lady beetle H. axyridis.

关键词： aphid honeydew attractant Harmonia axyridis kairomone semiochemicals

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

Fast-GC Quantification of Harmonine, the Maj.r Defense Alkaloid of the Multicolored Asian Ladybird Harmonia axyridis (Pallas)

引用

American j.urnal of Analytical Chemistry 2012年第1期

作者： Christophe Y. Fischer Pascal Laurent Stéphanie Heuskin Delphine Durieux Eric Haubruge François j. verheggen Georges C. Lognay

来源：评论

学校读者我要写书评

暂无评论

A new modeling approach of pressure waves at the inlet of internal combustion engines

引用

j.urnal of Thermal Science 2011年第2期20卷 181-188页

作者： David Chalet Alexandre Mahé j.an-Franois Hétet j.rme Migaud Internal Combustion Engine Team Laboratory of Fluid Mechanics UMR CNRS 6598 Ecole Centrale de Nantes Advanced development Mann+Hummel France

This paper presents a new model used to describe the propagation of pressure waves at the inlet systems of internal combustion engine. In the first part, an analogy is made between the compressible air in a pipe and a mechanical ideal mass damper spring system. A new model is then presented and the parameters of this model are determined by the use of an experimental setup (shock tube test bench). With this model, a transfer function is defined in order to link directly the pressure and the air mass flow rate. In the second part, the model is included into an internal combustion engine simulation code. The results obtained with this code are compared to experimental ones which are measured on a one-cylinder engine test bench. This last one is driven by an electric motor in order to study only the effect of the pressure waves on the engine behavior. A good agreement is obtained between the experimental results and the numerical ones and the new approach is an alternative method for modeling the pressure wave phenomena in an internal combustion engine manifold.

关键词： gas dynamics pressure wave compressible flow frequency analysis transfer function internal combustion engine

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

Triaxial tension and compression tests on saturated lime-treated plastic clay upon consolidated undrained conditions

引用

j.urnal of Rock Mechanics and Geotechnical Engineering 2023年第12期15卷 3328-3342页

作者： Kuchvichea Kan Bertrand François Department of Civil Engineering Institute of Technology of CambodiaPhnom PenhCambodia BATir Department UniversitéLibre de BruxellesBrusselsBelgium ArGEnCo Departement Universitéde LiègeLiègeBelgium

Lime-treatment of clayey soil significantly increases its shear and tensile ***,the tensile strength of lime-treated soils deserves careful investigation because it may provide an appreciable benefit for the stability of earth *** study investigates the tensile and shear strengths of an untreated and lime-treated(3%of lime)plastic clay at different curing times(7 d,56 d and 300 d),through triaxial tension and compression *** tension tests are performed using“diabolo-shaped”soil samples with reduced central section,such that the central part of the specimen can be under axial tension while both end-sections remain in axial *** undrained(CU)conditions with measurement of pore water pressure allow analyzing the failure conditions through effective stress and total stress *** results of triaxial tension tests reveal that the failure occurs under tensile mode at low confining pressure while extensional shear failure mode is observed under higher confining ***,a classical Mohr-Coulomb shear failure criterion must be combined with a cut-off tensile strength criterion that is not affected by the confining *** comparing shear failure under compression and tension,a slight anisotropy is observed.

关键词： Tensile strength Consolidated undrained(CU)triaxial test Lime-treated soils Failure criterion

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

Influence of the iodide/iodine redox system on the self-discharge of AC/AC electrochemical capacitors in salt aqueous electrolyte

引用

Progress in Natural Science:Materials International 2015年第6期25卷 622-630页

作者： Qamar Abbas Fran?ois Béguin Institute of Chemistry and Technical Electrochemistry Poznan University of Technology

Self-discharge(SD) of AC/AC(AC ? activated carbon) electrochemical capacitors in aqueous solutions of lithium sulfate(Li2SO4) and lithium sulfate t iodide salts(Li2SO4tKI or Li2SO4tLi I) was investigated at 24 1C and 40 1C after cell potential hold at values from 1 V to 1.6 ***24 1C,the cells exhibit lower SD in Li2SO4tKI than in Li2SO4,owing to the redox activity of the 2I /I2 system which drives the positive AC electrode to operate in narrow potential range and display lower potential drop than in *** 401 C,the capacitors exhibit comparable and reduced SD both in Li2SO4tLi I and Li2SO4,whatever the holding cell ***-electrode cell experiments demonstrate that,at 40 1C,hydrogen chemisorption is thermodynamically unfavored under negative polarization,while the activity of the 2I /I2 redox system under positive polarization is only slightly *** a consequence,the AC/AC cells in Li2SO4 exhibit a typical electrical double-layer performance at 401 C,whereas they still behave as hybrid ones in Li2SO4tLi I,with twice higher capacitance than in ***(Ui-Ut) vs t1/2plots demonstrate that SD is essentially controlled by diffusion at 401 C,suggesting that it originates from bulkier hydrated ***,in the investigated temperature range,the AC/AC capacitors in Li2SO4tLi I demonstrate low self-discharge and high capacitance,while being able to operate up to 1.6 V.

关键词： Supercapacitors Activated carbon Self-discharge Salt aqueous electrolyte Iodide/iodine redox system Activation and diffusion controlled mechanisms

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

Gas free oxidation of NaCN for presodiating and stabilizing the anodic host of sodium-ion capacitors

引用

j.urnal of Energy Chemistry 2022年第9期31卷 33-40,I0002页

作者： Xuexue Pan Agnieszka Choj.acka François Béguin Poznan University of Technology Institute of Chemistry and Technical ElectrochemistryBerdychowo 460-965 PoznanPoland

Sodium-ion capacitors(NICs)trigger considerable attention due to their higher specific energy than electrical double-layer capacitors(EDLCs)at comparable specific ***,the presodiation process of the anodic host is extremely crucial for the construction of high-performance ***,a positive EDL electrode containing activated carbon(AC)mixed with sodium cyanide(NaCN)as a sacrificial material was electrochemically oxidized to presodiate a Sn_(4)P_(3) anodic host buffered by hard carbon(HC).The oxidation of CN-occurred ca.2.9 V ***/Na+and finished by a short region of linearly increasing potential with a total capacity close to the theoretical value of 547 mAh g^(-1).The operando electrochemical mass spectrometry(EMS)analysis of the atmosphere in the cell together with the internal pressure measurements realized during the galvanostatic oxidation of a YP80F-NaCN electrode demonstrate that the process occurs without any gas evolution.A precursor cell of an NIC was constructed in a pouch with YP80FNaCN and HC/Sn_(4)P_(3) *** the oxidative sodium transfer from NaCN to HC/Sn_(4)P_(3),the realized YP80F//Nax(HC/Sn_(4)P_(3))NIC demonstrated a discharge capacitance retention higher than 80%for 8900 cycles in the voltage range from 2.0 to 3.8 *** infrared analysis of the anode obtained by the herein described transfer process detected polycyanogen,which stabilizes the electrode structure during cycling,and thereof is at the origin of the enhanced life span of the NIC.

关键词： Na-ion capacitors Activated carbon EDL electrode Sacrificial NaCN HC/Sn_(4)P_(3)anodic host Polycyanogen Anode stabilization

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

Dynamic impact protective body armour:A comprehensive appraisal on panel engineering design and its prospective materials

引用

Defence Technology（防务技术） 2021年第6期17卷 2027-2049页

作者： Mulat Alubel Abtew François Boussu Pascal Bruniaux Universite of Lille ENSAITGEMTEX Lab2 Allee Louise et Victor Champier59056RoubaixFrance Bahir Dar University Ethiopian Institute of Textile and Fashion TechnologyBahir DarEthiopia

Personal body armour is one of the most important pieces of equipment to protect human beings from various critical and fatal *** today’s modern world,various organizations including law enforcement and security service have made it mandatory for their personnel to wear personal protection system while on field ***,the systems should comprise an improved ballistic performance,light-weighted,flexible as well as comfortable panel not only to be accepted with a wider range but also for effective performances of the ***,the overall performances of the protective body armour could be affected by various parameters including armour design techniques,type of materials used and finishing of the *** current paper aims to critically review state-of-art for armour panel design techniques and the different perspective body armour *** paper starts by discussing the different body armour and its ***,the different states of technology for armour panel design(mostly for women),its problems and the possible solutions will be ***,the commonly used different polymeric fibrous and the future possible advanced materials including carbon nanotube(CNT),Graphene CNT and shear thickening fluids(STFs)treated materials for developing the reinforced body armour panel will be *** authors believe that this paper will enlighten useful guidelines and procedures about the different panel design techniques and current and promising future materials for researchers,designers,engineers and manufacturers working on the impact resistance body armour field.

关键词： Body armour panel design Ballistic impact behaviours Nanocomposites Shear thickening fluids(STFs) Military

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

Describing failure in geomaterials using second-order work approach

引用

Water Science and Engineering 2015年第2期8卷 89-95页

作者： Franois Nicot Félix Darve Institut de Recherche en Sciences et Technologies de l'Environnement et de l'Agriculture(IRSTEA) Erosion Torrentielle Neige et Avalanches (ETNA)Geomechanics GroupGrenoble 38402 France Université j.seph Fourier (Uj.)-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS) Laboratoire SolsSolides Structures et RisquesGrenoble 38041 France

Geomaterials are known to be non-associated materials. Granular soils therefore exhibit a variety of failure modes, with diffuse or localized kinematical patterns. In fact, the notion of failure itself can be confusing with regard to granular soils, because it is not associated with an obvious phenomenology. In this study, we built a proper framework, using the second-order work theory, to describe some failure modes in geomaterials based on energy conservation. The occurrence of failure is defined by an abrupt increase in kinetic energy. The increase in kinetic energy from an equilibrium state, under incremental loading, is shown to be equal to the difference between the external second-order work,involving the external loading parameters, and the internal second-order work, involving the constitutive properties of the material. When a stress limit state is reached, a certain stress component passes through a maximum value and then may decrease. Under such a condition, if a certain additional external loading is applied, the system fails, sharply increasing the strain rate. The internal stress is no longer able to balance the external stress, leading to a dynamic response of the specimen. As an illustration, the theoretical framework was applied to the well-known undrained triaxial test for loose soils. The influence of the loading control mode was clearly highlighted. It is shown that the plastic limit theory appears to be a particular case of this more general second-order work theory. When the plastic limit condition is met, the internal second-order work is nil. A class of incremental external loadings causes the kinetic energy to increase dramatically, leading to the sudden collapse of the specimen, as observed in laboratory.

关键词： Failure in geomaterials Undrained triaxial loading path Second-order work Kinetic energy Plastic limit condition Control parameter

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

Development and validation of SuperDEM for non-spherical particulate systems using a superquadric particle method

引用

Particuology 2022年第2期20卷 74-90页

作者： Xi Gao j.a Yu Ricardo j.F.Portal j.an-François Dietiker Mehrdad Shahnam William A.Rogers National Energy Technology Laboratory MorgantownWV 26506USA Leidos Research Support Team MorgantownWV 26506USA Centro de Investigação em Modelação e Otimização de Sistemas Multifuncionais Instituto Superior de Engenharia de LisboaPolytechnic Institute of Lisbon1959-007 LisboaPortugal Instituto de Engenharia Mecânica–Instituto Superior Técnico Universidade de Lisboa1049-001 LisboaPortugal

This article presents the development and validation of the Superquadric Discrete Element Method(SuperDEM)for non-spherical particle simulation using a superquadric particle method in open-source CFD suite MFiX.A superquadric particle-particle contact algorithm with accelerating and stabilizing strategy was developed.A superquadric particle-arbitrary wall contact algorithm was developed,which enables the simulation in complex *** solver was validated by comparing with experimental data generated in this study or available in the *** include cylinder contacting with a wall,static packing of M&M chocolate candies in a cylindrical container,static packing of cylinders in a cylindrical container,dynamic angle of repose of cylinders in a rotating drum,and discharging of chocolate candies from a ***,MPI parallelization of the solver was implemented and the parallel performance of the solver using MPI was assessed through large-scale simulations of 1 million,10 million,and 100 million particles on up to 6800 cores,which demonstrates that the SuperDEM solver has great potential for industrial-scale systems simulation.

关键词： DEM Particle Non-spherical Superquadric Parallelization MFiX

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

Printing accuracy tracking with 2D optical microscopy and super-resolution metamaterial-assisted 1D terahertz spectroscopy

引用

npj.Flexible Electronics 2020年第1期4卷 178-184页

作者： Mariia Zhuldybina Xavier Ropagnol ChloéBois Ricardo j.Zednik François Blanchard Département de génieélectrique École de technologie supérieure(ÉTS)MontréalQCCanada Institut national de la recherche scientifique Énergiematériaux et télécommunications(INRS-EMT)VarennesQCCanada Institut des Communications Graphiques et de l’imprimabilité MontréalQCCanada Collège Ahuntsic MontréalQCCanada Département de génie mécanique École de technologie supérieure(ÉTS)MontréalQCCanada

Printable electronics is a promising manufacturing technology for the potential production of low-cost flexible electronic devices,ranging from displays to active *** is known that rapid printing of conductive ink on a flexible substrate is vulnerable to several sources of variation during the manufacturing ***,this process is still not being subj.cted to a quality control method that is both non-invasive and in *** address this issue,we propose controlling the printing accuracy by monitoring the spatial distribution of the deposited ink using terahertz(THz)*** parameters studied are the printing speed of an industrial roll-to-roll press with flexography printing units and the pre-calibration compression,or expansion factor,for a pattern printed on a flexible plastic *** pattern,which is carefully selected,has Babinet’s electromagnetic transmission properties in the THz frequency *** validate our choice,we quantified the geometric variations of the printed pattern by visible microscopy and compared its accuracy using one-dimensional THz *** study shows a remarkable agreement between visible microscopic observation of the printing performance and the signature of the THz ***,under specific conditions,one-dimensional(1D)THz information from a resonant pattern can be more accurate than two-dimensional(2D)microscopy *** result paves the way for a simple strategy for non-invasive and contactless in situ monitoring of printable electronics production.

关键词： printing visible pattern

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

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

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

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：