Search results for "Tension"

Effect of conjugated system extension on structural features and electron-density distribution in charge–transfer difluoroborates

2021

A comparative structural study of two related donor–acceptor pyridine-based BF2 complexes, namely, 3-(dimethylamino)-1,1-difluoro-1H-pyrido[1,2-c][1,3,5,2]oxadiazaborinin-9-ium-1-uide, C8H10BF2N3O (1), and 3-{(1E,3E)-4-[4-(dimethylamino)phenyl]buta-1,3-dien-1-yl}-1,1-difluoro-1H-pyrido[1,2-c][1,3,5,2]oxadiazaborinin-9-ium-1-uide, C18H18BF2N3O (2), containing a dimethylamino group and either the shortest (in 1) or the longest (in 2) charge-transfer path known until now in this family of compounds, is presented. Single-crystal X-ray diffraction analysis supported by computational investigations shed more light on these systems, indicating, among other aspects, the predominance of C—H...F cont…

Mākslīgo skropstu pieaudzēšanas ietekme uz acs priekšējo struktūru veselību.

2020

Maģistra darbs ir uzrakstīts 60 lappusēs angļu valodā. Tas satur 23 attēlus, 45 informācijas avotus un 9 pielikumus. Mērķis: šī pētījuma mērķis ir noskaidrot, kādas acu izmaiņas ir notikušas vienu nedēļu pēc daļēji noturīgo skropstu pieaudzēšanas. Metodes: septiņiem pētījuma dalībniekiem tika četras reizes novērtētas konjunktīvas izmaiņas, asaru apjoma izmaiņas un alerģijas rādītājs, izmantojot arī subjektīvas anketas. Rezultāti: visiem šī pētījuma dalībniekiem bija daži ar daļēji noturīgu skropstu pieaudzēšanu saistīti acu simptomi, vairumam dalībnieku bija konjunktīvas apsārtums dažādos līmeņos, un daudziem bija asaru apjoma izmaiņas. Subjektīvi vissatraucošākie simptomi bija sausas/kairi…

Pienyrittäjän interaktiivinen toimintakyky : narratiivinen tulkinta suomalaisten pienyrittäjien toiminnasta sosiaalisissa liiketoimintaverkostoissa E…

2015

Tensions and striving for coherence in an academic’s professional identity work

2017

The emergence of ‘new managerialism’ in academic institutions and professions has given rise to tensions between one’s professional self and work context. Such tensions often originate from a misalignment between institutional and personal values. This study builds on a dialogical approach to identity and discusses the role of inner tensions and conflicts in terms of making sense of one’s professional identity. These aspects are explored and exemplified by introducing a sample case of one individual student and university researcher/teacher, Anna, who participated in one-year Pedagogical Studies for Adult Educators. Leaning on the narratives of Anna’s learning diaries and a later interview,…

Decentralized Deployment of Mobile Sensors for Optimal Connected Sensing Coverage

2008

In this paper, we address the optimal connected sensing coverage problem, i.e., how mobile sensors with limited sensing capabilities can cooperatively adjust their locations so as to maximize the extension of the covered area while avoiding any internal “holes”, areas that are not covered by any sensor. Our solution consists in a distributed motion algorithm that is based on an original extension of the Voronoi tessellation.

Effects of a short-term resistance training protocol on risk factors for the metabolic syndrome in the elderly

2016

The metabolic syndrome is strongly associated with negative health outcomes, such as type 2 diabetes, cardiovascular disease and death. The elderly are at particularly high risk of developing the metabolic syndrome, owing to the physiological and behavioural changes associated with aging. The positive influence that resistance training has on the neuromuscular system has long been evident; however, in more recent years, increasing focus has been placed on the role of RT in preventing and treating chronic disease. The majority of studies in the literature suggest that RT has a positive effect on cardiometabolic risk factors. That being said, there remain some inconsistencies. Whether improve…

Scatter search for an uncapacitated p-hub median problem

2015

Scatter search is a population-based method that has been shown to yield high-quality outcomes for combinatorial optimization problems. It uses strategies for combining solution vectors that have proved effective in a variety of problem settings. In this paper, we present a scatter search implementation for an NP -hard variant of the classic p-hub median problem. Specifically, we tackle the uncapacitated r-allocation p-hub median problem, which consists of minimizing the cost of transporting the traffics between nodes of a network through special facilities that act as transshipment points. This problem has a significant number of applications in practice, such as the design of transportati…

Electromagnetic wave propagation in non-homogeneous waveguides

2015

We investigate an electromagnetic waveguide, having several cylindrical ends. The waveguide is assumed to be empty and to have a perfectly conductive boundary. We study the electromagnetic field, excited in the waveguide in the presence of charges and currents. The field can be described as a solution of the stationary Maxwell system with conductive boundary conditions and “intrinsic” radiation conditions at infinity. We prove the problem to be well-posed. Electromagnetic waves propagation in the waveguide can be described by means of a scattering matrix. We introduce such a matrix for all values of the spectral parameter k in the waveguide continuous spectrum and study its properties. Moreove…

Hemorheological abnormalities in human arterial hypertension

2014

Blood rheology is impaired in hypertensive patients. The alteration involves blood and plasma viscosity, and the erythrocyte behaviour is often abnormal. The hemorheological pattern appears to be related to some pathophysiological mechanisms of hypertension and to organ damage, in particular left ventricular hypertrophy and myocardial ischemia. Abnormalities have been observed in erythrocyte membrane fluidity, explored by fluorescence spectroscopy and electron spin resonance. This may be relevant for red cell flow in microvessels and oxygen delivery to tissues. Although blood viscosity is not a direct target of antihypertensive therapy, the rheological properties of blood play a role in the…

Planar Sobolev extension domains

2017

This doctoral thesis deals with geometric characterizations of bounded planar simply connected Sobolev extension domains. It consists of three papers. In the first and third papers we give full geometric characterizations of W 1, p-extension domains for 1 < p < 2 and p = 1, respectively. The second paper establishes a density result for Sobolev functions on planar domains, necessary for the solution for the case p = 1. Combining with the known results, we obtain a full geometric characterization of W 1, p-extension domains for every 1 ≤ p ≤ ∞.