Search results for "Dam"
showing 10 items of 3828 documents
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…
Electrical conductivity of glass fiber-reinforced plastic with nanomodified matrix for damage diagnostic
2021
The electrical conductivity of glass fiber-reinforced plastic (GFRP) with epoxy matrix modified by multiwall carbon nanotubes (MWCNT) was studied. The electrical conductivity of nanomodified lamina and multi-layered GFRP was investigated on several levels using a structural approach. Components of the electrical conductivity tensor for unidirectional-reinforced monolayer were calculated similarly as in micromechanics using the conductivity of the nanomodified matrix. The electrical conductivity of multilayer composite was calculated using laminate theory and compared with values measured experimentally for various fiber orientation angles. Calculated and experimental data were in good agree…
Relationship between volume and energy of vector fields
2001
Abstract A unified study of energy and volume functionals is presented here by determining the critical points of a functional that extends simultaneously energy and volume and that is defined on the product of the manifold of smooth maps C∞(M,N) times the manifold M of riemannian metrics on M. The restriction of this functional to different submanifolds of the space of vector fields X (M)× M is also considered, and used to study several functionals generalizing volume and energy or total bending of vector fields
Erika Ādamsona personības un noveļu apguve 11. klasē
2019
Diplomdarba “Erika Ādamsona personības un noveļu iepazīšana 11. klasē” mērķis ir izstrādāt metodiskās sistēmas variantu, kas veicinātu pilvērtīgi apgūt Erika Ādamsona personību un “smalko kaišu” noveles, kā arī rosinātu izvērtēt prioritātes, vērtības un pilnveidot sevi kā personību, gūstot nozīmīgas atziņas. Darbā ir ievads, piecas nodaļas ar apakšnodaļām, secinājumi un pielikumi. Pirmajā nodaļā apzināta zinātniskā un pedagoģiskā literatūra par literatūras mācībpriekšmeta specifiku, kā arī par skolotāja lomu literatūras stundās. Otrajā nodaļā izzināta Erika Ādamsona personība un daiļrade, uzsvaru liekot uz “smalko kaišu” noveļu izzināšanu. Trešajā nodaļā aprakstīta skolotājas gatavošanās da…
L’importanza delle zone umide artificiali della Sicilia occidentale per la conservazione degli uccelli acquatici in Sicilia
2019
Listy otwarte Jędrzeja Giertycha do społeczeństwa w kraju z 1976 i 1982 r
2020
Jędrzej Giertych, niezwykle płodny publicysta i ideolog mchu narodowego na emigracji, w 1976 i 1982 r. ogłosił listy otwarte do społeczeństwa w kraju. Listy pisane w okresie narastania niepokojów społecznych i perturbacji politycznych w PRL były swoistym narzędziem walki politycznej oraz komunikacji z rodakami w kraju. Do zabrania głosu skłaniała Giertycha troska o los Polski. Emigracyjny publicysta czuł moralną potrzebę mówienia do narodu. W tonie żarliwego patriotyzmu ostrzegał przed groźbą antysowieckiego powstania, demaskował knowania światowego żydostwa, odwoływał się do straszaka niemieckiego. Wiemy spiskowej teorii dziejów, odsłaniał „prawdziwe” oblicze „trockistów” oraz piłsudczyków…
Photocatalytic nano-composite architectural lime mortar for degradation of urban pollutants under solar and visible (interior) light
2017
Abstract Recent advances in nano-technology and nano-additives can give enhanced properties to natural hydraulic lime (NHL), creating a multifunctional material. We have prepared a novel nanocomposite, made of a commercial mortar with 1 wt% and 5 wt% added titania nanoparticles (NPs). These TiO 2 NPs are themselves doped with 1 mol% silver, to give the material enhanced photocatalytic and antimicrobial properties. The Ag-doped TiO 2 NPs were made from a simple, costs effective, aqueous green nanosynthesis process, and the end material only contains 0.01–0.05% Ag. As this mortar is intended to both combat atmospheric pollution, and create more durable/lower maintenance building facades (plas…