Search results for "rives"
showing 10 items of 60 documents
Kalmbergin kartasto R III : List 7
1855
Automatic EMI filter design for power electronic converters oriented to high power density
2018
In this paper, a complete computer aided procedure based on the power density concept and aimed at the automatic design of EMI filters for power electronic converters is presented. It is rule-based, and it uses suitable databases built-up by considering information on passive components available from commercial datasheets. The power density constraint is taken into consideration by imposing the minimization of the filter volume and/or weight; nevertheless, the system in which the automatically designed filter is included satisfies the electromagnetic compatibility standards limits. Experimental validations of the proposed procedure are presented for two real case studies, for which the per…
Stenius vesistöt
1760
Upwelled plankton community modulates surface bloom succession and nutrient availability in a natural plankton assemblage
2022
Upwelling of nutrient-rich waters into the sunlit surface layer of the ocean supports high primary productivity in eastern boundary upwelling systems (EBUSs). However, subsurface waters contain not only macronutrients (N, P, Si) but also micronutrients, organic matter and seed microbial communities that may modify the response to macronutrient inputs via upwelling. These additional factors are often neglected when investigating upwelling impacts on surface ocean productivity. Here, we investigated how different components of upwelled water (macronutrients, organic nutrients and seed communities) drive the response of surface plankton communities to upwelling in the Peruvian coastal zone. Re…
The Animal Subject. Explorations on the Edge of Subjectivity
2021
Despite their undeniable connection to the body and its physiological processes, the phenomenological account of drives differentiates them from both instinctual behaviour and merely biological forces. They design a characteristic dimension of the personal grasp of the world, necessary for our meaningful orientation in all given situations. My claim is that Husserl’s interpretation of drives presents them not as centrifugal forces, but as centripetal strivings, contributing to the unitary constitution of the person. The conflicting interaction of drives lets emerge the animal subjectivity whose unity is given by a unique style of wishing and striving. The final question is, therefore, how t…
An accurate measurement procedure of power losses variations in electrical drives
2020
This paper presents a general procedure for the accurate measurement of power losses variations in electrical drives. More specifically, the paper addresses the issue related to the efficiency comparison of electrical drive controlled with different control algorithms. This procedure is applied to a permanent magnet synchronous motor drive, assessing its power losses by means of two different measurement systems, each one characterized by different accuracy and cost. The comparison between these two systems is carried out for different working conditions in terms of load, speed and magnetization in order to demonstrate that the power losses variations can be accurately measured even with no…
UiA Accelerated Life Time Bearing Test Rig – Test 3, Variable speed around 50rpm
2021
Vibration data from an accelerated lifetime test of a bearing. Contains raw vibration data and shaft position data. The mean shaft speed is 50rpm with a variation +- 40 rpm. Can be used for fault diagnosis and remaining useful lifetime estimation. Please see "00_ReadMe.pdf" file for more details.
Efficiency Improvement of Inverter-Fed Permanent Magnet Synchronous Motors
2003
In this paper a control algorithm for the efficiency improvement of inverter-fed permanent magnet synchronous motors (PMSMs) is presented. The proposed algorithm allows reducing the losses of the drive without reduction of its dynamic performances. In details, after recalling a dynamic model of the PMSM, which has been purposely modified and that takes into account the iron losses, the basic equations and the constraints to obtain the loss minimization are presented and discussed. Some simulations of a specific PMSM drive employing the proposed algorithm are performed. The results of these simulations show that the dynamic performances are maintained, and enhancement of the efficiency up to…
A Simple Software-based Resolver To Digital Conversion System
2022
In this paper, a software-based resolver to digital converter (RDC) is proposed. The hardware signal conditioning circuit is realized using common electronic components, while the algorithm can be implemented either using a microcontroller or an FPGA. Its validation and performance analysis has been carried out using an interior permanent magnet synchronous machine drive and, with comparative purposes, an LTN Servotechnik 1024 ppr incremental encoder. Tests show that the proposed RDC is characterized by a good dynamic response and precision, moreover, due to low computational demand, it can be successfully adopted without significant extra cost.
I rivestimenti marmorei nelle facciate del dopoguerra: dall'analisi tecnologica alla riqualificazione
2015
Il presente contributo intende analizzare le ragioni culturali e le caratteristiche tecnologiche dei rivestimenti marmorei delle facciate delle architetture realizzate in massima parte tra le due guerre, ma in alcuni casi anche nell’immediato secondo dopoguerra, al fine di proporre una soluzione innovativa e sostenibile per un loro recupero. Dopo avere brevemente analizzato le tipologie di queste architetture monumentali nel panorama nazionale, destinate nella maggior parte dei casi a funzioni pubbliche rappresentative, che affondano le loro radici culturali nelle ragioni delle architetture di regime, si procederà ad un esame delle differenti modalità di posa in opera dei rivestimenti marmo…