Search results for "AMP"
showing 10 items of 10184 documents
Capitales ou villes d'appui ? Les petites villes et leurs campagnes du Moyen Age au XXIe siècle
2014
International audience
Damping Provision by Different Virtual Synchronous Machine Schemes
2020
The adoption of virtual synchronous machine (VSM) schemes for the control of power converters is gaining more and more attention both in academia and industry. The VSM control strategies fall into the category of grid-forming converter controls, and they are intended for a range of different applications, providing specific services and different kinds of support to the grid. The paper investigates the possibility of damping provision to the system by VSM power converters. Different schemes are considered and compared, showing the opportunity of the investigated solutions through combined modal and time domain analyses. A specific modification of the power synchronization loop is recognized…
Passive Control of Linear Structures Equipped with non-Linear Viscous Dampers and Amplification Mechanism
2008
Fluid damper devices in civil structures such as buildings or bridges are commonly used as energy absorbers for seismic protection. The problem in the response analysis of structures with filled dampers mainly consists in the fact that, due to the strongly nonlinear behavior of such equipments, the response spectrum technique fails. Moreover, in order to enhance the damping effect various toggle brace configurations have been recently proposed. In this paper by using the concept of power spectral density function compatible with the elastic response spectrum and the stochastic linearization technique, the equivalent damping ratio is obtained. It is shown that once the system is linearized r…
Stochastic seismic analysis of MDOF structures with viscous damper devices
2009
Fluid damper devices in civil structures such as buildings or bridges are commonly used as energy absorbers for seismic protection. The problem in the response analysis of structures with filled dampers mainly consists in the fact that, due to the strongly nonlinear behavior of such equipments, the response spectrum technique fails. In this paper by using the concept of power spectral density function compatible with the elastic response spectrum and the stochastic linearization technique, the equivalent damping ratio is obtained. It is shown that once the system is linearized results obtained by Monte Carlo simulation and those obtained by stochastic analysis are in good agreement. Respons…
Vispārējās anestēzijas ietekme uz acs akomodācijas funkcijām
2018
Maģistra darbs ir uzrakstīts latviešu valodā, datorsalikumā uz 39 lapām. Tas satur 13 attēlus, 8 tabulas, 4 pielikumus un 28 atsauces uz literatūras avotiem. Darba mērķis ir kvantitatīvi novērtēt vispārējās anestēzijas ietekmi uz acs akomodācijas funkcijām. Acs akomodācijas funkcijas tika novērtētas vispārējās un spinālās anestēzijas pacientiem pirms un pēc operācijas. Akomodācijas funkciju perioperatīvās relatīvās izmaiņas starp vispārējās anestēzijas un spinālās anestēzijas grupu nav statistiski nozīmīgi atšķirīgas, tomēr vispārējās anestēzijas grupā pacientiem novērojamas statistiski nozīmīgas akomodācijas amplitūdas perioperatīvās relatīvās izmaiņas. Akomodācijas amplitūdas perioperatīv…
Anatomic and functional follow-up of patients with an idiopathic epiretinal membrane and a preserved visual acuity
2013
Purpose: To determine the anatomic and functional retinal modifications in patients with an idiopathic epiretinal membrane (ERM) and a preserved visual acuity (VA).Methods: Monocentric, prospective study in 24 eyes of 24 patients with an ERM and a VA better than 20/25. Recorded data were best corrected VA on ETDRS scale, retinal anatomic lesions on spectral-domain OCT, retinal sensitivities on microperimetry and macular and foveal thicknesses at 0 and 6 months.Results: At inclusion, mean VA was 84 ± 5 letters, mean macular sensitivity was 14.0 ± 1.4 decibels (dB) and mean foveal sensitivity was 14,4 ± 1,5 dB. Mean macular thickness was 351 ± 34 µm and mean foveal thickness was 348 ± 66 µm. …
Motion perception in early glaucoma
2013
Purpose: The aim of our study was to underline the changes in the movement perception for early glaucoma. Our working hypothesis consisted in inquiring if the impairment of the magnocellular pathway may modify the movement perception capabilities in the visual field, more particularly in its peripheral area.Methods: We included 14 healthy subjects and 14 patients with early primary open angle glaucoma. A moving target was presented on a semicircular screen (1.8 m diameter); participants were asked to localize the Ending Point (EP) of each movement. Each stimulus consisted in a white dot (0,72° of diameter) moving horizontally with the imposed velocity profile. Two different laws of motion w…
Lipid-related thiamine deficiency cause mortality of river lampreys (Lampetra fluviatilis) during pre-spawning fasting
2023
Publisher Copyright: © 2023 The Authors River lampreys (Lampetra fluviatilis) were caught in the fall 2014 on entering the River Perhonjoki for spawning and kept at a hatchery until spawning in late spring 2015 to produce larvae for compensatory stockings. Since the lampreys died massively from early February onwards, they were investigated in March and May to clarify the cause of the deaths. The symptoms in lampreys resembled those of lipid-related thiamine (vitamin B1) deficiency of salmonines, called the M74 syndrome in the Baltic Sea area. Because the lipid content of lampreys was known to be high, thiamine concentrations were analyzed in the liver and ovulated unfertilized eggs, and th…
CSDD reklāmas kampaņas "Izkāp no telefona!" vēstījums un auditorijas viedokļu analīze
2022
Bakalaura darba tēma ir CSDD reklāmas kampaņas “Izkāp no telefona!” vēstījums un auditorijas viedokļu analīze". Bakalaura darba mērķis ir izpētīt reklāmas kampaņas “Izkāp no telefona” auditorijas viedokli par reklāmas vizuālo atainojumu un vēstījuma nodošanu. Pētnieciskie jautājumi – kā CSDD reklāmas kampaņu “Izkāp no telefona” vērtē auditorija, vai vizuālais atainojums reklāmas kampaņas auditorijai, palīdz saprast problēmas nopietnību un vai reklāmas kampaņas vēstījums nonāca līdz auditorijai un lika rīkoties. Teorētiskajā daļā tiks apskatīts, kas ir reklāma un reklāmas kampaņa, kas jāņem vērā, lai izplānotu un izveidotu reklāmas kampaņu, kā arī, kā saprast, kuros mediju kanālos publicēt š…
Lidar detection of carbon dioxide in volcanic plumes
2015
Volcanic gases give information on magmatic processes. In particular, anomalous releases of carbon dioxide precede volcanic eruptions. Up to now, this gas has been measured in volcanic plumes with conventional measurements that imply the severe risks of local sampling and can last many hours. For these reasons and for the great advantages of laser sensing, the thorough development of volcanic lidar has been undertaken at the Diagnostics and Metrology Laboratory (UTAPRAD-DIM) of the Italian National Agency for New Technologies, Energy and Sustainable Economic Development (ENEA). In fact, lidar profiling allows one to scan remotely volcanic plumes in a fast and continuous way, and with high s…