Search results for "Efficiency factor"

showing 2 items of 2 documents

How the interplay of different control mechanisms affects the initiator efficiency factor in controlled radical polymerization: An investigation usin…

2007

International audience; Compound CpMoI2(iPr2dad) (iPr2dad = iPrNdouble bondCHsingle bondCHdouble bondNiPr), obtained by halide exchange from CpMoCl2(iPr2dad) and NaI, has been isolated and characterized by EPR spectroscopy, cyclic voltammetry, and X-ray crystallography. Its action as a catalyst in atom transfer radical polymerization (ATRP) and as a spin trap in organometallic radical polymerization (OMRP) of styrene and methyl acrylate (MA) monomers has been investigated and compared with that of the dichloro analogue. Compound CpMoCl2(iPr2dad) catalyzes the ATRP of styrene and MA with low efficiency factors f (as low as 0.37 for MA and ethyl 2-chloropropionate as initiator), while it irre…

Nitroxide mediated radical polymerizationRadical polymerizationAtom transfer010402 general chemistryPhotochemistry01 natural sciencesBiochemistryOne-electron oxidative additionStyreneInorganic Chemistrychemistry.chemical_compoundLiving free-radical polymerizationPolymer chemistryMaterials ChemistryReversible addition−fragmentation chain-transfer polymerization[CHIM.COOR]Chemical Sciences/Coordination chemistryPhysical and Theoretical ChemistryMethyl acrylateControlled radical polymerizationMolybdenum010405 organic chemistryChemistryAtom-transfer radical-polymerizationOrganic Chemistry[CHIM.CATA]Chemical Sciences/Catalysis0104 chemical sciences[CHIM.POLY]Chemical Sciences/PolymersCobalt-mediated radical polymerizationInitiator efficiency factor
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Adaptive Finite-Time Control for a Flexible Hypersonic Vehicle with Actuator Fault

2013

The problem of robust fault-tolerant tracking control is investigated. Simulation on the longitudinal model of a flexible air-breathing hypersonic vehicle (FAHV) with actuator faults and uncertainties is conducted. In order to guarantee that the velocity and altitude track their desired commands in finite time with the partial loss of actuator effectiveness, an adaptive fault-tolerant control strategy is presented based on practical finite-time sliding mode method. The adaptive update laws are used to estimate the upper bound of uncertainties and the minimum value of actuator efficiency factor. Finally, simulation results show that the proposed control strategy is effective in rejecting unc…

EngineeringArticle Subjectbusiness.industrylcsh:MathematicsGeneral MathematicsGeneral EngineeringMode (statistics)Hypersonic vehicleControl engineeringlcsh:QA1-939Track (rail transport)Tracking (particle physics)Upper and lower boundsActuator faultEfficiency factorComputer Science::Roboticslcsh:TA1-2040Control theorylcsh:Engineering (General). Civil engineering (General)businessActuatorMathematical Problems in Engineering
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