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Number of results: 7
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Abstract

The effects of activated sludge sonication on floes surface properties and heavy metal uptake was investigated. Negative surface charge and specific surface area were estimated by correlation with dye adsorption whereas relative hydrophobicity was measured by adhesion to hexadecane. Experimental results show that ultrasound treatment leads to a simultaneous increase of specific surface area and availability of negatives and/or hydrophilic sites. Thus, fixation sites for heavy metal uptake are made free by sonication. Both increase of specific surface area and fixation sites availability leads to an increase of uptake of Cd(II). For Cu(II), organ.ie matter released in soluble phase during the treatment acts as a ligand and limits adsorption on floes surface.
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Authors and Affiliations

Julien Laurent
M. Casellas
Christophe Dagot
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Abstract

In vivo biomedical devices are one of the most studied applications for vibrational energy harvesting. In this paper, we investigated a novel high-displacement device for harvesting heartbeats to power leadless implantable pacemakers. Due to the location peculiarities, certain constraints must be respected for the design of such devices. Indeed, the total dimension of the system must not exceed 5.9 mm to be usable within the leadless pacemakers and it must be able to generate accelerations lower than 0.25 m/s2 at frequencies of less than 50 Hz. The proposed design is an electrostatic system based on a square electret of dimension 4.5 mm. It is based on the Quasi-Concertina structure, which has a very low resonant frequency of 26.02 Hz and a low stiffness of 0.492 N/m, allowing it to be very useful in such an application. Using a Teflon electret charged at 1000 V, the device was able to generate an average power of 10.06 μW at a vibration rate of 0.25 m/s2 at the resonant frequency.
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Authors and Affiliations

Bilel Maamer
1
ORCID: ORCID
Nesrine Jaziri
1 2
ORCID: ORCID
Mohamed Hadj Said
3
ORCID: ORCID
Fares Tounsi
1
ORCID: ORCID

  1. Systems Integration and Emerging Energies (SI2E), École nationale d’ingénieurs de Sfax, Université de Sfax 3038 Sfax, Tunisia
  2. Electronics Technology Group, Institute of Micro and Nanotechnologies MacroNanoTechnische Universität Ilmenau, Gustav-Kirchhoff-Straße 1 Ilmenau 98693, Germany
  3. Center for Research in Microelectronics and Nanotechnology (CRMN) Sousse 4050, Tunisia
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Abstract

The text, inspired by the book in question, is devoted to contemporary investigations of Slovak terrain names, presenting them to the Polish reader. The main questions discussed are perspectives of a study of the archaic lexical stock, chiefly of Slavic origin, conserved in Slovak toponymy, as well as the current organization of the dictionary entry, which is judged to be far from optimal. Some corrections to the entries in A- regarding concrete etymological solutions are suggested as well.

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Authors and Affiliations

Zbigniew Babik
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Abstract

To date, only once has the Constitutional Tribunal handed down a verdict concerning the unconstitutionality of a certain maritime legal regulation. This, of course, does not mean that the other legal regulations are constitutional. This paper presents arguments that support this thesis. Primarily, the author analyzes regulations on fisheries of 2004 and those pertaining to the Polish marine areas and the maritime administration from 1991. According to the author, mainly legal regulations regarding financial penalties are constitutionally suspect.

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Authors and Affiliations

Zbigniew Godecki
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Abstract

The article describes a technique developed for identification of extrinsic parameters of a stereovision camera system for the purpose of image rectification without the use of reference calibration objects. The goal of the presented algorithm is the determination of the mutual position of cameras, under the assumption that they can be modeled by pinhole cameras, are separated by a fixed distance and are moving through a stationary scene. The developed method was verified experimentally on image sequences of a scene with a known structure.

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Authors and Affiliations

Paweł Peczyński
Bartosz Ostrowski
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Abstract

The dual core bit-byte CPU must be equipped with properly designed circuits, providing interface between the two processor units, and making it possible to exploit all its advantages like versatility of the byte unit and speed of the bit unit. First of all, the interface circuits should be designed in such a way, that they don’t disturb maximally parallel operation of the units, and that the CPU as a whole works in the same manner as in a standard PLC. The paper presents hardware solutions supporting effective operation of PLC CPU-s. Possibilities of solving problems concerning data exchange between a CPU and peripheral circuits were presented, with a special stress on timers and counters, and also on data exchange between the bit unit and the byte unit. The objective of the proposed solutions is to decrease the time necessary for a CPU to access its peripheries.

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Authors and Affiliations

M. Chmiel

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