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showing 10 items of 7011 documents

Ocena aktywności przeciwdrobnoustrojowej ekstraktu roślinnego z Dionaea muscipula

2018

Rośliny owadożerne są przedmiotem badań, nie tylko ze względu na charakterystyczny dla nich sposób pobierania składników odżywczych z otoczenia, ale również z powodu ich pożądanego oddziaływania na mikroorganizmy. W piśmiennictwie znajdujemy potwierdzenie, że ekstrakty z roślin owadożernych mają działanie nie tylko bakteriostatyczne, ale również bakteriobójcze i grzybobójcze. Do badań wybrano jednego z przedstawicieli roślin owadożernych, Dionaea muscipula J. Ellis (Muchołówka amerykańska), w celu określenia ich aktywności biologicznej. Materiałem do badań były odpowiednio przygotowanie ekstrakty z dwóch odmian Dionaea muscipula: Regular Form oraz Red Green. Hodowle prowadzono w warunkach ś…

Dionaea muscipulasecondary metabolitesMuchołówka amerykańskamikroorganizmy patogennemetabolity wtórnepathogenic microorganisms
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Ludovico Ariosto un Torquato Tasso: diplomdarbs

1941

Diplomdarbi:HUMANITIES and RELIGION::Aesthetic subjects::Literature [Research Subject Categories]Italian literatureAriosto Lodovico1474-1533Itāliešu dzeja 16. gs. - vēsture un kritikaItāliešu literatūraItalian poetry of the 16th century - history and criticismTasso Torquato1544-1595
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An eigenvalue Dirichlet problem involving the p-Laplacian with discontinuous nonlinearities

2005

AbstractA multiplicity result for an eigenvalue Dirichlet problem involving the p-Laplacian with discontinuous nonlinearities is obtained. The proof is based on a three critical points theorem for nondifferentiable functionals.

Dirichlet problemDiscontinuous nonlinearitiesApplied MathematicsMathematical analysisp-LaplacianMultiple solutionsMathematics::Optimization and ControlDirichlet's energyMathematics::Spectral TheoryEigenvalue Dirichlet problemCritical points of nonsmooth functionsNonlinear systemsymbols.namesakeDirichlet eigenvalueDirichlet's principleRayleigh–Faber–Krahn inequalitysymbolsp-LaplacianEigenvalues and eigenvectorsAnalysisMathematicsJournal of Mathematical Analysis and Applications
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New isoperimetric estimates for solutions to Monge - Ampère equations

2009

Abstract We prove some sharp estimates for solutions to Dirichlet problems relative to Monge–Ampere equations. Among them we show that the eigenvalue of the Dirichlet problem, when computed on convex domains with fixed measure, is maximal on ellipsoids. This result falls in the class of affine isoperimetric inequalities and shows that the eigenvalue of the Monge–Ampere operator behaves just the contrary of the first eigenvalue of the Laplace operator.

Dirichlet problemMonge-Ampère operatoreigenvalue.Mathematics::Complex VariablesApplied MathematicsMathematical analysisMathematics::Analysis of PDEsMonge–Ampère equationMonge-Ampère equationMathematics::Spectral TheoryMeasure (mathematics)Operator (computer programming)Settore MAT/05 - Analisi MatematicaAffine isoperimetric inequaltieRayleigh–Faber–Krahn inequalityAffine isoperimetric inequalitiesIsoperimetric inequalityLaplace operatorMathematical PhysicsAnalysisEigenvalues and eigenvectorsMathematics
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Varieties of Codes and Kraft Inequality

2007

Decipherability conditions for codes are investigated by using the approach of Guzman, who introduced in [7] the notion of variety of codes and established a connection between classes of codes and varieties of monoids. The class of Uniquely Decipherable (UD) codes is a special case of variety of codes, corresponding to the variety of all monoids. It is well known that the Kraft inequality is a necessary condition for UD codes, but it is not sufficient, in the sense that there exist codes that are not UD and that satisfy the Kraft inequality. The main result of the present paper states that, given a variety V of codes, if all the elements of V satisfy the Kraft inequality, then V is the var…

Discrete mathematicsClass (set theory)Computational Theory and MathematicsTheory of computationHigh Energy Physics::ExperimentAstrophysics::Cosmology and Extragalactic AstrophysicsKraft's inequalityVariety (universal algebra)Special caseConnection (algebraic framework)Mathematics::Representation TheoryTheoretical Computer ScienceMathematicsTheory of Computing Systems
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Varieties of Codes and Kraft Inequality

2005

Decipherability conditions for codes are investigated by using the approach of Guzman, who introduced in [7] the notion of variety of codes and established a connection between classes of codes and varieties of monoids. The class of Uniquely Decipherable (UD) codes is a special case of variety of codes, corresponding to the variety of all monoids. It is well known that the Kraft inequality is a necessary condition for UD codes, but it is not sufficient, in the sense that there exist codes that are not UD and that satisfy the Kraft inequality. The main result of the present paper states that, given a variety $\mathcal{V}$ of codes, if all the elements of $\mathcal{V}$ satisfy the Kraft inequ…

Discrete mathematicsClass (set theory)Unique factorization domainCode wordAstrophysics::Cosmology and Extragalactic AstrophysicsKraft's inequalityCombinatoricsFormal languageHigh Energy Physics::ExperimentSpecial caseVariety (universal algebra)Connection (algebraic framework)Mathematics::Representation TheoryMathematics
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Admissible perturbations of alpha-psi-pseudocontractive operators: convergence theorems

2016

In the last decades, the study of convergence of fixed point iterative methods has received an increasing attention, due to their performance as tools for solving numerical problems. As a consequence of this fact, one can access to a wide literature on iterative schemes involving different types of operators; see [2, 4, 5]. We point out that fixed point iterative approximation methods have been largely applied in dealing with stability and convergence problems; see [1, 6]. In particular, we refer to various control and optimization questions arising in pure and applied sciences involving dynamical systems, where the problem in study can be easily arranged as a fixed point problem. Then, we …

Discrete mathematicsDynamical systems theoryIterative methodGeneral Mathematics010102 general mathematicsGeneral EngineeringHilbert spacePerturbation (astronomy)Krasnoselskij type fixed point iterative schemeFixed point01 natural sciences010101 applied mathematicssymbols.namesakeSettore MAT/08 - Analisi Numericaalpha-psi-pseudocontractive operatorFixed point problemSettore MAT/05 - Analisi Matematicaalpha-admissible mappingsymbolsApplied mathematicsIterative approximation0101 mathematicsApplied scienceMathematics
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Schaefer–Krasnoselskii fixed point theorems using a usual measure of weak noncompactness

2012

Abstract We present some extension of a well-known fixed point theorem due to Burton and Kirk [T.A. Burton, C. Kirk, A fixed point theorem of Krasnoselskii–Schaefer type, Math. Nachr. 189 (1998) 423–431] for the sum of two nonlinear operators one of them compact and the other one a strict contraction. The novelty of our results is that the involved operators need not to be weakly continuous. Finally, an example is given to illustrate our results.

Discrete mathematicsQuantitative Biology::Neurons and CognitionPicard–Lindelöf theoremApplied MathematicsFixed-point theoremFixed-point propertyKrasnoselskii fixed point theoremSchauder fixed point theoremNonlinear integral equationsMeasure of weak noncompactnessBrouwer fixed-point theoremKakutani fixed-point theoremContraction (operator theory)Nonlinear operatorsAnalysisMathematicsJournal of Differential Equations
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Uz dzimumu balstīta diskriminācija attiecībā uz pieeju precēm un pakalpojumiem

2020

Lai gan uz dzimumu balstīta diskriminācija joprojām pastāv, tās izskaušana jau gadu desmitiem ir viens no Eiropas Savienības galvenajiem mērķiem. Lai pēc iespējas efektīvāk izskaustu uz dzimumu balstītu diskrimināciju, nepietiek tikai ar šī jēdziena noskaidrošanu un regulējuma apskatīšanu. Tādēļ paralēli šo jautājumu aplūkošanai, autore centīsies izprast uz dzimumu balstītas diskriminācijas esamības iemeslus un veidus, kā tos ir iespējams izskaust. Bakalaura darba mērķis ir noskaidrot jēdziena “dzimums” būtību, uz dzimumu balstītas diskriminācijas esamības iemeslus un analizēt uz dzimumu balstītas diskriminācijas attiecībā uz pieeju precēm un pakalpojumiem esošo regulējumu un tā nepilnības.…

DiskriminācijaStereotipiDirektīva 2004/113/EKDzimumsJuridiskā zinātne
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Ksenofobijas cēloņi un izpausmes Japānas sabiedrībā

2021

Maģistra darbs “Ksenofobijas cēloņi un izpausmes Japānas sabiedrībā” dod ieskatu par ksenofobiju Japānas sabiedrībā. Šī darba tēma tika izvelēta, lai izpētītu Japānas sabiedrības attieksmi pret minoritātēm un parādīt, ka japāņiem piemīt ksenofobiskā attieksme pret “citiem”. Maģistra darba galvenais mērķis ir ne tikai apskatīt ksenofobijas cēloņus un izpausmēs Japānas sabiedrībā un definēt kādas iedzīvotāju grupas tiek diskriminētas, bet arī apskatīt ksenofobijas izskaušanas stratēģijas un pasākumus, kurus bija veikusi Japānas valdība, lai uzlabotu situāciju, un to rezultātus. Neskatoties uz to, ka Japānas valdība veic ksenofobijas izskaušanas pasākumus, diskriminācijas un ksenofobijas probl…

DiskriminācijaValodniecībaKsenofobijaJapānas sabiedrībaJapāna
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