Search results for "COMPOSITE"

showing 10 items of 4584 documents

Chromogenic detection of nerve agent mimics

2008

The current rise in international concern over criminal terrorist attacks via chemical warfare (CW) agents has resulted in an increasing interest in the detection of these lethal chemicals. Among CW species, nerve agents are extremely dangerous and their high toxicity and ease of production underscore the need to detect these deadly chemicals via quick and reliable procedures. A number of detection systems have been developed, most of them based on enzymatic and physical methodologies. However, these usually show limitations such as low selectivity, lack of portability and a certain complexity in their use. An alternative to these classical methods that has been gaining interest in recent y…

musculoskeletal diseasesTertiary amineUNESCO::QUÍMICANerve agent mimicsElectron donorBiosensing TechniquesUNESCO::ASTRONOMÍA Y ASTROFÍSICA:QUÍMICA [UNESCO]Reductive aminationCatalysischemistry.chemical_compoundOrganophosphorus CompoundsMaterials ChemistryMoietyChemical Warfare Agentsskin and connective tissue diseasesChromogenic protocol ; Nerve agent mimics ; Internationalchemistry.chemical_classificationChromogenic protocolMolecular StructureChromogenicChemistryfungiMetals and AlloysGeneral ChemistryElectron acceptorCombinatorial chemistrySurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsDiethyl chlorophosphatebody regionsKineticsstomatognathic diseasesChromogenic CompoundsInternationalCeramics and CompositesColorimetryHypsochromic shiftAzo Compounds:ASTRONOMÍA Y ASTROFÍSICA [UNESCO]

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Ritz Solution for Transient Analysis of Variable-Stiffness Shell Structures

2020

The dynamic response of thin-walled structures is driven by mass and stiffness distribution. As such, variable-stiffness (VS) composites offer opportunities to tune structural dynamic responses. To this extent, efficient analysis tools become increasingly important for structural analysis and design purposes. In this work, an efficient and versatile Ritz method for free vibrations and linear transient analysis of VS doubly curved shell structures is presented. VS shell structures are modeled as an assembly of shell-like domains. The shell kinematics is based on the first-order shear deformation theory, and no further assumption is made on the shallowness or on the thinness of the structure.…

musculoskeletal diseasesanimal structuresMaterials scienceDistribution (number theory)Shell (structure)Aerospace Engineeringmacromolecular substances02 engineering and technologyVariable angle tow composites Composite shells Ritz method01 natural sciencesSpherical shellData preparation010305 fluids & plasmasComputer Science::RoboticsPhysics::Fluid Dynamics0203 mechanical engineering0103 physical sciencesmedicineComposite material020301 aerospace & aeronauticsVariable stiffnesstechnology industry and agricultureStiffnessequipment and suppliesTransient analysisFinite element methodmedicine.symptomAIAA Journal

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Stiffness and Reinforcement Effect of electrical Resistance Strain Gauges

2007

: The increasing use of low-modulus materials, on which the reinforcement effect of the electrical resistance strain gauge is not negligible, has re-opened the research interest into this issue. This study deals with the evaluation of stiffness, and of the strain gauge Young's modulus involved in the estimation of both the global and the local reinforcement effect; the relationship between the strain gauge stiffness and the local reinforcement effect is also analysed. In particular, the experimental technique used to determine the stiffness of some commercial strain gauges is described. The results show that the strain gauge stiffness alone does not permit an accurate evaluation of the loc…