Search results for "rings"

showing 10 items of 434 documents

A review of diagnostics and prognostics of low-speed machinery towards wind turbine farm-level health management

2016

Abstract Large wind farms are gaining prominence due to increasing dependence on renewable energy. In order to operate these wind farms reliably and efficiently, advanced maintenance strategies such as condition based maintenance are necessary. However, wind turbines pose unique challenges in terms of irregular load patterns, intermittent operation and harsh weather conditions, which have deterring effects on life of rotating machinery. This paper reviews the state-of-the-art in the area of diagnostics and prognostics pertaining to two critical failure prone components of wind turbines, namely, low-speed bearings and planetary gearboxes. The survey evaluates those methods that are applicabl…

0209 industrial biotechnologyEngineeringGearbox020209 energy02 engineering and technologyTurbineBearings; Diagnostics; Gearbox; Health management; Prognostics; Reliability centered maintenance; Wind turbines; Renewable Energy Sustainability and the Environment020901 industrial engineering & automationWind turbines0202 electrical engineering electronic engineering information engineeringForensic engineeringRenewable EnergyDiagnosticsPrognosticsReliability (statistics)Wind powerHealth management systemSustainability and the EnvironmentRenewable Energy Sustainability and the Environmentbusiness.industryCondition-based maintenanceReliability centered maintenanceRenewable energyReliability engineeringLow speedHealth managementPrognosticsbusinessBearings

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Parallel distributed compensation for voltage controlled active magnetic bearing system using integral fuzzy model

2018

Parallel Distributed Compensation (PDC) for current-controlled Active Magnetic Bearing System (AMBS) has been quite effective in recent years. However, this method does not take into account the dynamics associated with the electromagnet. This limits the method to smaller scale applications where the electromagnet dynamics can be neglected. Voltage-controlled AMBS is used to overcome this limitation but this comes with serious challenges such as complex mathematical modelling and higher order system control. In this work, a PDC with integral part is proposed for position and input tracking control of voltage-controlled AMBS. PDC method is based on nonlinear Takagi-Sugeno (T-S) fuzzy model. …

0209 industrial biotechnologyOperating pointElectromagnetComputer scienceAMB voltage-controlledFuzzy modelComputingMagnetic bearing020206 networking & telecommunications02 engineering and technologyFuzzy logiclaw.inventionActive Magnetic BearingsNonlinear system020901 industrial engineering & automationControl theorylawTakagi-Sugeno0202 electrical engineering electronic engineering information engineeringAir gap (plumbing)/dk/atira/pure/subjectarea/asjc/1700/dk/atira/pure/core/subjects/computingVoltageParallel Distributed CompensationComputer Science(all)

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ParDRe: faster parallel duplicated reads removal tool for sequencing studies

2016

This is a pre-copyedited, author-produced version of an article accepted for publication in Bioinformatics following peer review. The version of record [insert complete citation information here] is available online at: https://doi.org/10.1093/bioinformatics/btw038 [Abstract] Summary: Current next generation sequencing technologies often generate duplicated or near-duplicated reads that (depending on the application scenario) do not provide any interesting biological information but can increase memory requirements and computational time of downstream analysis. In this work we present ParDRe , a de novo parallel tool to remove duplicated and near-duplicated reads through the clustering of S…

0301 basic medicineStatistics and ProbabilityFASTQ formatDNA stringsSource codeDownstream (software development)Computer sciencemedia_common.quotation_subjectParallel computingcomputer.software_genreBiochemistryDNA sequencing03 medical and health scienceschemistry.chemical_compound0302 clinical medicineHybrid MPI/multithreadingCluster AnalysisParDReMolecular BiologyGenemedia_commonHigh-Throughput Nucleotide SequencingSequence Analysis DNAParallel toolComputer Science ApplicationsComputational Mathematics030104 developmental biologyComputational Theory and MathematicschemistryData miningcomputerAlgorithms030217 neurology & neurosurgeryDNABioinformatics

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Strategic Syntheses of Vine and Wine Resveratrol Derivatives to Explore their Effects on Cell Functions and Dysfunctions

2018

Trans-resveratrol, the most well-known polyphenolic stilbenoid, is found in grapes and accordingly in wine and it is considered to be beneficial for human health, especially towards the aging-linked cell alterations by providing numerous biological activities, such as anti-oxidant, antitumoral, antiviral, anti-inflammatory, neuroprotective, and platelet anti-aggregation properties. Although trans-resveratrol is a promising molecule, it cannot be considered as a drug, due to its weak bio-availability and fast metabolism. To overcome these weaknesses, several research teams have undertaken the synthesis of innovative trans-resveratrol derivatives, with the aim to increase its solubility in wa…

0301 basic medicineWineSynthetic derivativesChemistrylcsh:Rlcsh:Medicinefood and beveragesReviewComputational biologybiological targetsResveratrolStilbenoidsubstituents phenyl ringsCell functionsynthesis strategies03 medical and health sciencesHuman healthchemistry.chemical_compound030104 developmental biologyresveratrol derivativesefficacy towards diseasesOrganismDiseases

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Infinitesimal deformations of double covers of smooth algebraic varieties

2003

The goal of this paper is to give a method to compute the space of infinitesimal deformations of a double cover of a smooth algebraic variety. The space of all infinitesimal deformations has a representation as a direct sum of two subspaces. One is isomorphic to the space of simultaneous deformations of the branch locus and the base of the double covering. The second summand is the subspace of deformations of the double covering which induce trivial deformations of the branch divisor. The main result of the paper is a description of the effect of imposing singularities in the branch locus. As a special case we study deformations of Calabi--Yau threefolds which are non--singular models of do…

14B07; 14J3014J30Direct sum14B07General MathematicsInfinitesimalMathematical analysisAlgebraic varietySymbolic computationLinear subspaceequisingular deformationsMathematics - Algebraic GeometryMathematics::Algebraic GeometryFOS: MathematicsProjective spaceGravitational singularityLocus (mathematics)Algebraic Geometry (math.AG)double coveringsMathematics

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Lie Algebras Generated by Extremal Elements

1999

We study Lie algebras generated by extremal elements (i.e., elements spanning inner ideals of L) over a field of characteristic distinct from 2. We prove that any Lie algebra generated by a finite number of extremal elements is finite dimensional. The minimal number of extremal generators for the Lie algebras of type An, Bn (n>2), Cn (n>1), Dn (n>3), En (n=6,7,8), F4 and G2 are shown to be n+1, n+1, 2n, n, 5, 5, and 4 in the respective cases. These results are related to group theoretic ones for the corresponding Chevalley groups.

17B05[ MATH.MATH-GR ] Mathematics [math]/Group Theory [math.GR]Non-associative algebraAdjoint representationGroup Theory (math.GR)01 natural sciences[MATH.MATH-GR]Mathematics [math]/Group Theory [math.GR]Graded Lie algebraCombinatoricsMathematics - Algebraic Geometry0103 physical sciences[MATH.MATH-RA] Mathematics [math]/Rings and Algebras [math.RA]FOS: Mathematics0101 mathematicsAlgebraic Geometry (math.AG)[MATH.MATH-GR] Mathematics [math]/Group Theory [math.GR]MathematicsDiscrete mathematicsAlgebra and Number TheorySimple Lie group010102 general mathematics[MATH.MATH-RA]Mathematics [math]/Rings and Algebras [math.RA]20D06[MATH.MATH-AG] Mathematics [math]/Algebraic Geometry [math.AG]Mathematics - Rings and AlgebrasKilling formAffine Lie algebra[ MATH.MATH-RA ] Mathematics [math]/Rings and Algebras [math.RA]Lie conformal algebra[ MATH.MATH-AG ] Mathematics [math]/Algebraic Geometry [math.AG]Adjoint representation of a Lie algebraRings and Algebras (math.RA)17B05; 20D06010307 mathematical physics[MATH.MATH-AG]Mathematics [math]/Algebraic Geometry [math.AG]Mathematics - Group TheoryJournal of Algebra

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Direct measurement of resonance driving terms in the super proton synchrotron (SPS) of cern using beam position monitors

2003

El objetivo principal de esta tesis consiste en desarrollar un metodo para medir los terminos resonantes del Hamiltoniano de un acelerador mediante la transfomada de Fourier de la posicion del haz vuelta tras vuelta. Dos aspectos fundamentales de este metodo de medida son: el efecto de la decoherencia del haz en el espectro de Fourier y la variacion longitudinal de estos terminos resonantes. Ambos se estudian analiticamente y mediante simulaciones numericas. Con el fin de probar la validez de esta tecnica se realizaron experimentos en dos aceleradores de hadrones: el SPS del CERN y el RHIC del BNL. Por ultimo se estudia como utilizar dipolos AC para que esta tecnica no sea destructiva

53nonePhysics::Accelerator PhysicsFísicaNuclear ExperimentAccelerators and Storage Rings

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Thermomineral waters of Greece: geochemical characterization

2020

75 °C). In terms of pH most results vary from 5.5 to 823 °C) ii) warm (23 40 °C) iii) thermal (40 75 °C) and iv) hyperthermal (&gtfew springs show either very low pH (&lt10) proposing serpentinization processes. Regarding TDS concentrations collected waters can be subdivided into low salinity (up to 1.5 g/L) brackish (up to 20 g/L) and saline (up to 43 g/L). The medium high salinities can be justified by mixing with sea water and/or strong waterrock interaction processes. Isotope composition of O and H ranges from 12.7 to +2.7 ‰ SMOW and from 91 to +12 ‰ SMOW respectively and is generally comprised between the Global Meteoric Water Line and the East Mediterranean Meteoric Water Line. Only few water samples show a positive shift for δ18O possibly related to high temperature waterrock interaction processes. Carbon dioxide (18 997000 μmol/mol) or N2 (1100 989000 μmol/mol) or CH4 (&ltMany geothermal areas of Greece are located in regions affected by Miocene or Quaternary volcanism and in continental basins characterised by elevated heat flow. Moreover the majority of them is found along the coast as well as in islands of the Aegean Sea and thus thermal water is often brackish to saline due to marine intrusion into costal aquifer. In the present study almost 300 thermal and cold mineral water samples were collected along the Hellenic territory with their physicochemical parameters (temperature pH electrical conductivity and Eh) and the amount of bicarbonates (titration with 0.1N HCl) being determined in situ. Additionally gases found either in free or dissolved phase were sampled. Both water and gas samples were analysed at the INGVPa laboratories for major ions (Ion Chromatography) silica (Inductively Coupled Plasma Optical Emission Spectrometry) chemical composition of free and dissolved gases (Gas Chromatography) water isotopes (O and H) and carbon and helium isotopes of free and dissolved gases (Mass Spectrometry). The temperature of the investigated waters ranges from 6.5 to 98°C pH from 1.96 to 11.98 whilst Total Dissolved Solids (TDS) from 0.06 to 43 g/L. Based on the temperature parameter waters can be divided into four groups: i) cold (&lt0.5 913000 μmol/mol) are the prevailing gas species found in the studied sites. The δ13CCO2 values ranged from 20.1 to +8.5 ‰ whilst the isotope ratio of He from 0.21 to 6.71 R/RA.4) suggesting interaction with H2Srich gases or very high pH values (&gtSettore GEO/08 - Geochimica E Vulcanologia

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Perspectives for the Treatment of Brucellosis in the 21st Century: The Ioannina Recommendations

2007

Policy Forum. Competing interests: ER has received research grants from Daiichi, Bayer, and Theravance and has served as a consultant to Pfizer, Theravance, Bayer, Wyeth, Rosetta, and BiondVax. Summary Points Brucellosis remains the commonest anthropozoonosis worldwide, and its treatment remains complex, requiring protracted administration of more than one antibiotic. In November 2006, a consensus meeting aimed at reaching a common specialist statement on the treatment of brucellosis was held in Ioannina, Greece under the auspices of the International Society of Chemotherapy and the Institute of Continuing Medical Education of Ioannina. The author panel suggests that the optimal treatment o…

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Present status and first results of the final focus beam line at the KEK Accelerator Test Facility

2011

ATF2 is a final-focus test beam line which aims to focus the low emittance beam from the ATF damping ring to a vertical size of about 37 nm and to demonstrate nanometer level beam stability. Several advanced beam diagnostics and feedback tools are used. In December 2008, construction and installation were completed and beam commissioning started, supported by an international team of Asian, European, and U.S. scientists. The present status and first results are described.

Accelerator Physics (physics.acc-ph)Nuclear and High Energy PhysicsLow emittancePhysics and Astronomy (miscellaneous)Nuclear engineering[PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph]FOS: Physical sciencesbeam transport01 natural sciencesBeam characteristicslaw.inventionNuclear physicslaw0103 physical sciencesddc:530lcsh:Nuclear and particle physics. Atomic energy. RadioactivityBeam handling010306 general physicsAccelerator Test FacilityPhysicsFocus (computing)Research Groups and Centres\Physics\Low Temperature Physics010308 nuclear & particles physicsFaculty of Science\PhysicsBeam commissioningFísicaParticle acceleratorSurfaces and Interfaces29.27.Eg 29.27.Fh 29.20.dbAccelerators and Storage RingsStorage rings and collidersCOLLIDERSTechnology for normal conducting higher energy linear accelerators [9]BeamlineTest beamlcsh:QC770-798Physics - Accelerator PhysicsBeam (structure)

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