Search results for "init"
showing 10 items of 6629 documents
Analytical-numerical analysis of closed-form dynamic model of Sayano-Shushenskaya hydropower plant : stability, oscillations, and accident
2021
This work is devoted to the analysis of a mathematical model of hydropower unit, consisting of synchronous generator, hydraulic turbine, and speed governor. It is motivated by the accident happened on the Sayano-Shushenskaya hydropower plant in 2009 year. In the analysis we follow the line of classical control theory approach developed in the works of famous scientists J.C. Maxwell, I.A. Vishnegradsky, A.A. Andronov, and F. Tricomi for the study of centrifugal turbine governor and electrical machines limit-load problem. It is shown that the occurrence of vibrations in the Sayano-Shushenskaya hydropower plant can be caused by nonlinear dynamics of the closed-form model. peerReviewed
Counterintuitive Mechanisms of the Addition of Hydrogen and Simple Olefins to Heavy Group 13 Alkene Analogues
2013
The mechanism of the reaction of olefins and hydrogen with dimetallenes ArMMAr (Ar = aromatic group; M = Al or Ga) was studied by density functional theory calculations and experimental methods. The digallenes, for which the most experimental data are available, are extensively dissociated to gallanediyl monomers, :GaAr, in hydrocarbon solution, but the calculations and experimental data showed also that they react with simple olefins, such as ethylene, as intact ArGaGaAr dimers via stepwise [2 + 2 + 2] cycloadditions due to their considerably lower activation barriers vis-à-vis the gallanediyl monomers, :GaAr. This pathway was preferred over the [2 + 2] cycloaddition of olefin to monomeric…
Revisited Dual Luminescence of 2,2′-Dipyridylamine Hydrochloride in Solution and Physical Processes behind It
2018
Probing the Gelation Synergies and Anti-Escherichia coli Activity of Fmoc-Phenylalanine/Graphene Oxide Hybrid Hydrogel
2023
The N-fluorenyl-9-methyloxycarbonyl (Fmoc)-protected amino acids have shown high antimicrobial application potential, among which the phenylalanine derivative (Fmoc-F) is the most well-known representative. However, the activity spectrum of Fmoc-F is restricted to Gram-positive bacteria only. The demand for efficient antimicrobial materials expanded research into graphene and its derivatives, although the reported results are somewhat controversial. Herein, we combined graphene oxide (GO) flakes with Fmoc-F amino acid to form Fmoc-F/GO hybrid hydrogel for the first time. We studied the synergistic effect of each component on gelation and assessed the material’s bactericidal activity on Gram…
Operaattorisidonnaisten verkkopalveluiden liiketoimintaympäristöt
2002
Determinantes en la divulgación y desempeño en Responsabilidad Social Empresarial (RSE): un estudio comparativo en organizaciones de Latinoamérica
2021
El objetivo de la presente tesis es el de analizar los factores que determinan la divulgación y el desempeño en cuanto a Responsabilidad Social Empresarial (RSE) de empresas cotizadas de Latinoamérica, aportando evidencia empírica sobre características organizacionales, financieras y de gobierno por las que se ven influenciadas. Se parte de un análisis bibliográfico acerca de factores que explican la divulgación voluntaria de información de sostenibilidad, posteriormente se realiza un estudio empírico a través de un análisis de regresión logística a partir del cual, se identifican los factores corporativos que influyen el nivel de adherencia de la información contenida en las memorias de so…
Plato and Antisthenes in the Phaedo: A Reflexive Reading. Part One
2019
The purpose of this study is not so much to show the presence of Antisthenes in the dialogue, but rather to examine what Plato alludes to. The controversy over ideas between the two Socratics is historically very well-attested, as can already be seen in the Cratylus. Thus, it is reasonable to assume that this controversy must have affected Plato when he was writing a dialogue in which the importance of ideas and his new logic is undeniable. Hence, this paper will investigate the following question: what impact could Antisthenes’ denominative and definitory logic have on the equally denominative and definitory logic presented in the Phaedo given that the latter work in all probability preced…
Eye and cat scratch disease: A case series
2016
Resume Introduction La maladie des griffes du chat est une affection polymorphe, pouvant se manifester par des atteintes ophtalmologiques isolees. Nous rapportons les observations cliniques de sept cas, ayant presente une atteinte ophtalmologique posterieure de la maladie des griffes du chat. Observations Notre population comprenait sept patients, dont cinq femmes, d’âge median de 52 ans, avec une atteinte unilaterale dans trois cas. Une neuroretinite stellaire de Leber etait retrouvee chez six patients, un syndrome incomplet dans deux cas (soit un œdeme papillaire isole, soit un œdeme maculaire trainant) et associe a des foyers chorioretiniens dans un cas. Des foyers retiniens isoles ont e…
Effects of intrinsic aerobic capacity, aging and physical activity on interleukin-15 protein level in serum and skeletal muscle
2015
Myokines are cytokines and other peptides produced in muscle that can transmit autocrine, paracrine or endocrine signals to other tissues. This is a potential way for exercise to carry out its beneficial effects on different parts of the body. Interleukin-15 (IL-15) is a myokine that has been shown to exert beneficial effects on multiple tissues: skeletal muscle, adipose tissue, bone and skin. Muscle-derived IL-15 signaling remains to be fully elucidated. It is known that the expression and signaling is affected by aging, exercise, and intrinsic aerobic capacity. The purpose of this study was to assess the effects of intrinsic aerobic capacity, aging and physical activity separately and in …
Amino acid metabolism in athletes and non-athletes : with special reference to amino acid concentrations and protein balance in exercise, training an…
2002
Hannu Pitkänen tutki väitöskirjassaan fyysisen harjoituksen, pitkän harjoitusjakson ja ikääntymisen aiheuttamia vaikutuksia elimistön aminohappo- ja proteiiniaineenvaihduntaan. Ihmisen elämälle välttämätön ravintoaine, proteiini (valkuaisaine), jota on noin 15 % kehon painosta, koostuu aminohapoista. Välttämättömät aminohapot on saatava ravinnosta, kun taas ei-välttämättömiä aminohappoja voidaan tuottaa elimistössä. Vain noin 0.5-1.0 % aminohapoista on vapaana veressä ja lihaksen sisällä ns. vapaana aminohappoaltaana. Aminohappoja tulee altaaseen ravinnosta, kudoksiin sidotun proteiinin hajoamisesta ja hiilihydraatti- ja rasva-aineenvaihdunnan välituotteita siirtämällä kehon sisällä veren v…