Search results for "Power"

Methodology for Calculating the Potential Maritime Wind Park Area by Taking into Account the Needs of Shipping Sector

2018

Renewable energy sources (wind energy, solar energy, hydroelectricity, ocean energy, geothermal energy, biomass and biofuels) are alternatives to fossil fuel that help to reduce greenhouse gas emissions, diversify energy supplies and reduce dependency on markets of unsustainable and volatile fossil fuels, particularly oil and gas. Wind energy is one of the renewable energy sources and is considered to be self-renewable as it is the result of the Sun’s activity. Using wind energy is a rapidly developing industry today, and more and more wind turbines are installed worldwide every year, land-based wind turbines being more widespread than offshore ones. In Latvia, spread of land-based wind par…

Wake and Turbulence Analysis for Wind Turbine Layouts in an Island

2018

There is a big wind energy potential in supplying the power in an island and most of the islands are off-grid. Due to the limited area in island(s), there is need to find appropriate layout / location for wind turbines suited to the local wind conditions. In this paper, we have considered the wind resources data of an island in Trøndelag region of the Northern Norway, situated on the coastal line. The wind resources data of this island have been analysed for wake losses and turbulence on wind turbines for determining appropriate locations of wind turbines in this island. These analyses are very important for understanding the fatigue and mechanical stress on the wind turbines. In this work,…

Performance Improvement of a Drag Hydrokinetic Turbine

2021

Hydropower is at present in many locations, among all the other possible renewable energy sources, the best one for net cost per unit power. In contrast to traditional installation, based on water storage in artificial basins, free flow river turbines also provide a very low environmental impact due to their negligible effect on solid transport. Among them, kinetic turbines with vertical axis are very inexpensive and have almost zero impact on fish and local fauna. In application to tidal waves and sea waves, where vertically averaged velocities have alternate direction, a Savonius rotor also has the advantage of being productive during the whole time cycle. In this work, the effect of an u…

A Cost–Benefit Based, Parametric Procedure to Screen Existing Irrigation and Municipal Supply Reservoirs for Wind Energy Storage

2018

Pumped hydro storage (PHS) is one of the more suitable energy storage technologies to provide bulk storage of intermittent renewable energy sources (RES) such as wind. Since the main limiting factors to the expansion of this mature technology are environmental and financial concerns, the use of an existing reservoir can help mitigate both types of impacts. In addition, the high number of reservoirs for municipal and irrigation supply in many areas of the world makes the idea of using PHS as a relatively diffuse, open-market, technology for RES management attractive. These arguments in favor of PHS must, however, be convincing for investors and regulators from an economic standpoint. To this…

Aspectos jurídicos del poder. Los "ilegalismos". El "caso Sade"

2011

RESUMENSe ha dicho que una de las características jurídicas del Estado contemporáneo es la convivencia de zonas de anomia con otras de puntillosa reglamentación jurídica, y a la vez con la práctica de ciertos “ilegalismos” tolerados. Estos “ilegalismos” serían ámbitos de actividades prohibidas legalmente pero toleradas por el poder con la misión de lograr alguna otra finalidad distinta de la prevista por las leyes. El mundo del sexo es un campo típico para el ejercicio de  los “ilegalismos” y la figura del Marqués de Sade se convierte en un personaje revelador del funcionamiento de esa práctica.   ABSTRACT It is said that one of the characteristics of the contemporaneous legal system is the…

Editorial to the ‘Special Issue—Solar Photovoltaic System Engineering’ of AIMS Energy

2020

Relationship Between the Critical Power Test and a 20-min Functional Threshold Power Test in Cycling.

2021

To investigate the agreement between critical power (CP) and functional threshold power (FTP), 17 trained cyclists and triathletes (mean ± SD: age 31 ± 9 years, body mass 80 ± 10 kg, maximal aerobic power 350 ± 56 W, peak oxygen consumption 51 ± 10 mL⋅min–1⋅kg–1) performed a maximal incremental ramp test, a single-visit CP test and a 20-min time trial (TT) test in randomized order on three different days. CP was determined using a time-trial (TT) protocol of three durations (12, 7, and 3 min) interspersed by 30 min passive rest. FTP was calculated as 95% of 20-min mean power achieved during the TT. Differences between means were examined using magnitude-based inferences and a paired-samples…

Difficulties Perceived by ICU Nurses Providing End-of-Life Care: A Qualitative Study

2020

Background: With advances in medicine and technology, intensive care units (ICUs) have the capacity to treat patients who would have previously not been expected to survive and would therefore not have been managed in ICUs. When an individual is not expected to survive, doctors and nurses face the modern ethical dilemma of death associated with withdrawal of life-supporting strategies. The aim of this study was to identify difficulties perceived by ICU nurses providing end-of-life care (EOLC) in Poland. Methods: The qualitative study was designed to investigate the difficulties, and the related barriers, to EOLC provided in ICUs in Poland. We conducted individual telephone interviews with I…

Open dialogue as a human rights-aligned approach

2019

Throughout the last 20 years, the human rights perspective has increasingly developed into a paradigm against which to appraise and evaluate mental health care. This article investigates to what extent the Finnish open dialogue (OD) approach both aligns with human rights and may be qualified to strengthen compliance with human rights perspectives in global mental health care. Being a conceptual paper, the structural and therapeutic principles of OD are theoretically discussed against the background of human rights, as framed by the Universal Declaration of Human Rights, the UN Convention on the Rights of People with Disabilities, and the two recent annual reports of the Human Rights Council…

VOX Spain: The Organisational Challenges of a New Radical Right Party

2021

This article examines the organisation of VOX, a new radical right party in Spain. It shows that the party has taken early and uneven steps to build a mass organisation and initially opted for open membership recruitment with participatory organisational elements. Also, the party’s rapid growth and quick entrance into political institutions at different state levels led the party leadership to establish more centralised control and limit members’ prerogatives, though recruitment continued. Centralisation in part responds to organisational needs given the party’s quickly acquired political relevance, but also to the desire of the central party leadership to forestall the articulation of terr…