Search results for "eccentricity"
showing 8 items of 38 documents
Geometric optimal control of elliptic Keplerian orbits
2005
This article deals with the transfer of a satellite between Keplerian orbits. We study the controllability properties of the system and make a preliminary analysis of the time optimal control using the maximum principle. Second order sufficient conditions are also given. Finally, the time optimal trajectory to transfer the system from an initial low orbit with large eccentricity to a terminal geostationary orbit is obtained numerically.
Eccentricity in Mervyn Peake’s work
2013
International audience; Ce chapitre analyse l’un des motifs principaux de l’œuvre de Mervyn Peake: l’excentricité et ses modes d’expression textuelle et picturale dans Letters from a Lost Uncle (1948) et Figures of Speech (1954), au sein de l’intertexte formé par les biographies d’excentriques et le nonsense.
Interview in Will Self's radio programme "The Death of the Eccentric" on Radio 4 (Archive 4)https://www.bbc.co.uk/programmes/m0006kt6
2019
Eccentric Women? Gender and the Notion of Eccentricity
2012
British writers in the eighteenth century spent much time reflecting on the notion of normality, as the rising middle ranks promoted their ideology as a class, while defending the right of the individuals to their own personal choices. The period was also marked by scientific advances, and for this reason, it is not surprising that the term 'eccentric', originally restricted to astronomy, started to be used widely to refer to unconventional human behaviour. At first sight, eccentricity in the eighteenth century seems to be a male preserve, as the term is mostly applied to men famous for their wit and original thinking, such as Samuel Johnson or Lawrence Sterne. From this point of view, wome…
Sakarība starp acs iekšējo spiedienu un redzes nerva diska parametriem
2017
Maģistra darbs uzrakstīts uz 43 lappusēm. Darbs satur 25 attēlus un atsauces uz 41 literatūras avotu. Darba mērķis bija novērtēt acs iekšējā spiediena saistību ar redzes nerva ekskavācijas eksentricitāti cilvēkiem, kuriem nav konstatēta glaukoma. Pētījumā tika veikts Itālijā un tika analizētas 100 cilvēku acis. Pētījuma dalībnieku vecums bija no 25 līdz 45 gadiem, no kuriem 41 bija sieviete un 59 vīrieši. Tika novērtēts acs iekšējais spiediens, ņemot vērā radzenes pahimetrijas datus un tika iegūtas ar fundus kameru redzes nervu fotogrāfijas. Darbā tiek secināts, ka veselām acīm nepastāv korelācija starp acs iekšējo spiedienu un ekskavācijas lielumu, kā arī nepastāv korelācija starp vecumu. …
Discovery of slow X-ray pulsations in the high-mass X-ray binary 4U 2206+54
2008
Context. The source 4U 2206+54 is one of the most enigmatic high-mass X-ray binaries. In spite of intensive searches, X-ray pul- sations have not been detected in the time range 10−3–103 s. A cyclotron line at ∼30 keV has been suggested by various authors but never detected with significance. The stellar wind of the optical companion is abnormally slow. The orbital period, initially reported to be 9.6 days, disappeared and a new periodicity of 19.25 days emerged. Aims. The main objective of our RXTE monitoring of 4U 2206+54 is to study the X-ray orbital variability of the spectral and timing parameters. The new long and uninterrupted RXTE observations allow us to search for long (∼1 h) puls…
2018
Purpose: There is some controversy whether or not saccades change with age. This cross-sectional study aims to clarify the characteristics of reflexive saccades at various ages to establish a normative cohort in a standardized set-up. Second objective is to investigate the feasibility of saccadometry in daily ophthalmological practice. Methods: One hundred healthy participants aged between 6 and 76 years underwent an ophthalmologic examination and saccadometry, using an infrared video-oculography device, sampling at 220 Hz. The reflexive saccades were evoked in four directions and three target displacements each (5°/15°/30° horizontally and of 5°/10°/20° vertically). Saccadic peak velocity,…
Disrupted Spatial Organization of Cued Exogenous Attention Persists Into Adulthood in Developmental Dyslexia
2021
Purpose: Abnormal exogenous attention orienting and diffused spatial distribution of attention have been associated with reading impairment in children with developmental dyslexia. However, studies in adults have failed to replicate such relationships. The goal of the present study was to address this issue by assessing exogenous visual attention and its peripheral spatial distribution in adults with developmental dyslexia.Methods: We measured response times, accuracy and eye movements of 18 dyslexics and 19 typical readers in a cued discrimination paradigm, in which stimuli were presented at different peripheral eccentricities.Results: Results showed that adults with developmental dyslexia…