Search results for "current"

Short-term variability of mesozooplankton in a Mediterranean Coastal sound (Stagnone di Marsala, Western Sicily)

2001

Short-term variations in mesozooplankton were studied during four 24-h periods at one station in a Mediterranean coastal sound (Stagnone di Marsala, western Sicily) in May, July and October 1996 and March 1997. Zooplankton samples were collected every three or six hours with a plankton net (mesh size 125 µm) towed horizontally at the surface. Hydrometric data (height of tide, speed and direction of current) were also recorded to assess the influence of the hydrodynamic conditions on fluctuations in zooplankton abundance and changes in population structure. The zooplankton assemblages were markedly dominated by copepods and their naupliar stages, which consistently accounted for more than 95…

Impact of Initial Soil Temperature Derived from Remote Sensing and Numerical Weather Prediction Datasets on the Simulation of Extreme Heat Events

2016

Extreme heat weather events have received increasing attention and has become of special importance as they can remarkably affect sectors as diverse as public health, energy consumption, water resources, natural biodiversity and agricultural production. In this regard, summer temperatures have become a parameter of essential interest under a framework of a hypothetical increase in the number of intense-heat conditions. Thus, their forecast is a crucial aspect bearing in mind a mitigation of the effects and impacts that these intense-heat situations could produce. The current work tries to reach a better understanding of these sorts of situations that are really common over the Western Medit…

Assessing surface sediment dynamics along the north-west coast of Marsa Dhouiba (Tunisia, southern Mediterranean)

2016

International audience; An investigation was conducted from summer 2012 to winter 2013 at 25 stations along the Tunisian coast near Kef Abbed at Marsa Dhouiba (north-east Mediterranean Sea) to analyse grain size, sediment mineralogy and currents. Particle-size analysis shows that sand deposits at shallow depths are characterised by S-shaped curves, indicating a degree of agitation and possible transport by rip currents near the bottom. At greater depths (between 10 and 30 m), the bottom is covered by coarse sand and gravel. A current was observed transporting sediment eastward along the coast; another seaward current was also noted. Generated by wind, swell and especially waves from west to…

1997

A bipolar membrane (BM) is a layered structure composed of one cation and one anion ion-exchange layers joined together in series. Polymer BMs offer promising applications for many industrial processes (e. g., the use of bipolar electrodialysis for environmentally clean technologies and the treatment of salt-water effluents) because of their unique electrochemical properties. The most important of these properties is the electric field enhanced (EFE) water dissociation which arises when an electric current is forced through the membrane. This phenomenon occurs at the bipolar junction of the BM, and its coupling with ion transport, though still poorly understood, is the basis of most of the …

Observable Quantities for Electrodiffusion Processes in Membranes

2008

Electrically driven ion transport processes in a membrane system are analyzed in terms of observable quantities, such as the apparent volume flow, the time dependence of the electrolyte concentration in one cell compartment, and the electrical potential difference between the electrodes. The relations between the fluxes and these observable quantities are rigorously deduced from balances for constituent mass and solution volume. These relations improve the results for the transport coefficients up to 25% with respect to those obtained using simplified expressions common in the literature. Given the practical importance of ionic transport numbers and the solvent transference number in the ph…

Anodal tDCS over the left prefrontal cortex does not cause clinically significant changes in circulating metabolites

2020

Background: Transcranial direct current stimulation (tDCS), a putative treatment for depression, has been proposed to affect peripheral metabolism. Metabolic products from brain tissue may also cross the blood–brain barrier, reflecting the conditions in the brain. However, there are no previous data regarding the effect of tDCS on circulating metabolites.\ud Objective: To determine whether five daily sessions of tDCS modulate peripheral metabolites in healthy adult men.\ud Methods: This double-blind, randomized controlled trial involved 79 healthy males (aged 20–40 years) divided into two groups, one receiving tDCS (2 mA) and the other sham stimulated. The anode was placed over the left dor…

Estratègies discursives iròniques en la narrativa catalana actual: l'autoconsciència textual

2010

A partir de textos de Jesús Moncada, Quim Monzó, Carme Riera, Ramon Solsona i Sergi Pàmies, l'article analitza l'existència en la narrativa breu catalana actual d'una tendència que es caracteritza per l'ús dels recursos de la metaficció, adaptats als interessos literaris i a l'estil de cada autor però amb una orientación general compartida. Es tracta d'una tendència de clar signe antirealista i amb plena consciència de textualitat que fa explícits els mecanismes de la ficció; una modalitat de discurs irònic que s'interroga sobre les possibilitats i els límits de representació del real i, en definitiva, sobre allò que entenem per realitat. Departing from some texts by Jesús Moncada, Quim Mon…

CUDASW++ 3.0: accelerating Smith-Waterman protein database search by coupling CPU and GPU SIMD instructions

2013

Background The maximal sensitivity for local alignments makes the Smith-Waterman algorithm a popular choice for protein sequence database search based on pairwise alignment. However, the algorithm is compute-intensive due to a quadratic time complexity. Corresponding runtimes are further compounded by the rapid growth of sequence databases. Results We present CUDASW++ 3.0, a fast Smith-Waterman protein database search algorithm, which couples CPU and GPU SIMD instructions and carries out concurrent CPU and GPU computations. For the CPU computation, this algorithm employs SSE-based vector execution units as accelerators. For the GPU computation, we have investigated for the first time a GPU …

Über die autoxydation ungesättigter verbindungen XI. Mitteilung. Die katalyse der autoxydation von linolsäuremethylester mit linolsäuremethylesterhyd…

1959

Aus oxydiertem Linolsauremethylester wurde das Linolsauremethylesterhydroperoxyd durch Gegenstromverteilung isoliert und reinem Linolsauremethylester als Katalysator fur die Autoxydation zugesetzt. Kinetische Versuche zeigen die identische Wirkung des zugesetzten Linolsauremethylesterhydroperoxydes und des Autokatalysators der Spontanreaktion. Methyl linoleate hydroperoxide was isolated from autoxidized methyl linoleate by counter current distribution and was added to pure methyl linoleate as catalyst for its autoxidation. The identical effect of added methyl linoleate hydroperoxide with the autocatalyst of the autoxidation reaction is demonstrated by kinetic experimetns.

Using Matlab's wavelet toolbox to compare electric signals outputted by microbial fuel cells

2019

Motivation: microbial fuel cells (MFC) represents a wastewater treatment technology with the potential for a relevant electric energy generation. The monitoring of the electric current outputted generates time series of data. It was generated two time series using an experimental setup with a low-cost dual chamber microbial fuel cell treating cassava wastewater and, also, it was used the electric current data from a previously described experiment with this same setup treating cheese whey. All of this, innovatively, according our best knowledge, was studied using power spectral density, multifractal and wavelet coherence analysis. Results are promising and indeed point out this approach as …