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    Wyświetlanie 1-9 z 9
    Tytuł:
    Tests on the effect of ultrasonic treatment on two different activated sludge waste
    Autorzy:
    Simonetti, M.
    Rossi, G.
    Cabbai, V.
    Goi, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/207290.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    anaerobic digestion
    nitrogen compounds
    wastewater treatment
    biogas production
    pulp and paper wastewater
    ultrasonic treatment
    waste activated sludges
    ultradźwięki
    fermentacja beztlenowa
    związki azotu
    oczyszczanie ścieków
    produkcja biogazu
    ścieki celulozowo-papiernicze
    obróbka ultradźwiękami
    osady ściekowe
    Opis:
    The effect of ultrasonic treatment on two different waste activated sludges (WASI and WAS2) was compared by batch tests. WASI was taken from an industrial WWTP that treats pulp and paper wastewater, WAS2 was obtained from a traditional municipal WWTP. Physical and chemical characterization of sludges and supernatants was performed at various specific energy inputs. Upon increasing specific energy input, sludge structure changed, particle size decreased and organic and nitrogen release increased. A different release of organic matter and nitrogen compound related to the sludge origin was observed. The study is a preliminary assay of the potential of sonication treatment to enhance biogas production in anaerobic digestion.
    Źródło:
    Environment Protection Engineering; 2014, 40, 1; 23-34
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrical resistivity tomography to delineate greenhouse soil variability
    Autorzy:
    Rossi, R.
    Amato, M.
    Bitella, G.
    Bochicchio, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/24838.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Opis:
    Appropriate management of soil spatial variability is an important tool for optimizing farming inputs, with the result of yield increase and reduction of the environmental impact in field crops. Under greenhouses, several factors such as non-uniform irrigation and localized soil compaction can severely affect yield and quality. Additionally, if soil spatial variability is not taken into account, yield deficiencies are often compensated by extra-volumes of crop inputs; as a result, over-irrigation and overfertilization in some parts of the field may occur. Technology for spatially sound management of greenhouse crops is therefore needed to increase yield and quality and to address sustainability. In this experiment, 2D-electrical resistivity tomography was used as an exploratory tool to characterize greenhouse soil variability and its relations to wild rocket yield. Soil resistivity well matched biomass variation (R2=0.70), and was linked to differences in soil bulk density (R2=0.90), and clay content (R2=0.77). Electrical resistivity tomography shows a great potential in horticulture where there is a growing demand of sustainability coupled with the necessity of stabilizing yield and product quality.
    Źródło:
    International Agrophysics; 2013, 27, 2
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dry and Wet Heat Transfer Through Clothing Dependent on the Clothing Properties Under Cold Conditions
    Autorzy:
    Richards, M. G. M.
    Rossi, R.
    Meinander, H.
    Broede, P.
    Candas, V.
    Hartog den, E.
    Holmer, I.
    Nocker, W.
    Havenith, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/90562.pdf
    Data publikacji:
    2008
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    heat transfer
    moisture
    condensation
    wet conduction
    clothing systems
    Opis:
    The purpose of this study was to investigate the effect of moisture on the heat transfer through clothing in relation to the water vapour resistance, type of underwear, location of the moisture and climate. This forms part of the work performed for work package 2 of the European Union THERMPROTECT project. Thermal manikin results of dry and wet heat loss are presented from different laboratories for a range of 2-layer clothing with similar dry insulations but different water vapour permeabilities and absorptive properties. The results obtained from the different manikins are generally consistent with one another. For each climate, total wet heat loss is predominately dependent on the permeability of the outer layer. At 10 °C, the apparent evaporative heat loss is markedly higher than expected from evaporation alone (measured at 34 °C), which is attributed to condensation within the clothing and to increased conductivity of the wet clothing layers.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2008, 14, 1; 69-76
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental Analysis of a Directive Antenna with a 3D-EBG Superstrate
    Autorzy:
    Pajewski, L.
    Frezza, F.
    Marciniak, M.
    Piuzzi, E.
    Rossi, G. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/307787.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    directivity enhancement
    electromagnetic bandgap materials
    Fabry-Perot cavities
    periodic structures
    woodpile
    Opis:
    A three-dimensional electromagnetic crystal is employed as a directivity-enhancing superstrate for planar antennas. The crystal is a woodpile made of alumina rods. In a shielded anechoic chamber, the performance of a patch antenna covered with the woodpile is measured. The superstrate is positioned at different distances from the antenna and its orientation is varied in the 8–12 GHz frequency range. The return loss, gain and radiation pattern in the E- and H-planes are measured. The electromagnetic behavior of Fabry-Perot cavities with woodpile mirrors, equivalent to the compound radiator, is also studied. The main effect of the crystal on the antenna performance is an enhancement of about 10 dB in maximum gain. A rather complete series of experiments is presented, highlighting the role of the periodic structure in the directivity enhancement and allowing a deeper understanding of the electromagnetic phenomena involved in EBG resonator antennas. Benefits and disadvantages of this kind of antennas are discussed and ideas for future research are given.
    Źródło:
    Journal of Telecommunications and Information Technology; 2017, 3; 113-124
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Exposure of Workers to Electromagnetic Fields. A Review of Open Questions on Exposure Assessment Techniques
    Autorzy:
    Mild, K. H.
    Alanko, T.
    Decat, G.
    Falsaperla, R.
    Gryz, K.
    Hietanen, M.
    Karpowicz, J.
    Rossi, P.
    Sandstrom, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/91031.pdf
    Data publikacji:
    2009
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    occupational exposure
    exposure assessment
    measurements
    numerical simulations
    safety guidelines
    EU directive
    compliance testing
    medical implants
    health examination
    Opis:
    European Directive 2004/40/EC on occupational exposure to electromagnetic fields (EMF), based on the guidelines of the International Commission on Non-Ionizing Radiation Protection, was to be implemented in the Member States of the European Union by 2008. Because of some unexpected problems the deadline was postponed until 2012. This paper reviews some of the problems identified and presents some suggestions for possible solutions based on the authors’ experience in assessing occupational exposure to EMF. Among the topics discussed are movement in static magnetic fields, ways to time average extreme low frequency signals, the difference between emission and exposure standards, and ways of dealing with those issues.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2009, 15, 1; 3-33
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanical components dynamic characterization using thermoelastic stress analysis and digital image correlation
    Autorzy:
    Marsili, R.
    Rossi, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/328501.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
    Tematy:
    thermoelasticity
    digital image correlation
    speckle
    rubber
    TSA
    DIC
    termosprężystość
    cyfrowa korelacja obrazu
    charakterystyka termomechaniczna
    guma
    Opis:
    In this work the possibility to characterize mechanical components combining thermoelastic measurement technique (TSA) and digital image correlation (DIC) is studied. The combination of these two different methodologies allows to analyze thermo-mechanical characteristics of materials such as plastic and rubber, which are difficult to study with the only thermoelastic methodology. The digital image correlation allows to determinate the first invariant of deformation ε1, using a differential thermocamera. Lack of adiabatic conditions, essential for methodology use, makes analysis not simple. Digital image correlation allows to obtain the same information by correlating digital images acquired during static or dynamic deformationof an object, but with limitations linked to acquisition system. An accurate analysis is dedicated to the study of first invariant of deformation related to Young’s module variation, performed by load cycles with variable amplitude and displacement. Comparative analysis between the two measurement methodologies has been performed on rubber samples loaded by dynamic compression.
    Źródło:
    Diagnostyka; 2018, 19, 1; 3-9
    1641-6414
    2449-5220
    Pojawia się w:
    Diagnostyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electromagnetic Fields: Principles of Exposure Mitigation
    Autorzy:
    Falsaperla, R.
    Spagnoli, G.
    Rossi, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/90023.pdf
    Data publikacji:
    2006
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    EMF (electromagnetic fields)
    mitigation
    shielding
    pole elektromagnetyczne
    zagrożenia zdrowia
    ekspozycja
    EMF
    Opis:
    Basic principles of reducing exposure to electromagnetic fields are reviewed in this article. Measures to reduce exposure can be divided into organisational/administrative and technical/engineering actions. Both strategies are briefly analysed and the basic principles of the theory of shielding are presented. A definition of shielding effectiveness (SE) is given, and the results from the general Transmission Lines Theory are presented. Practical situations of shielding static and time-varying electric and magnetic fields are discussed on the basis of the physical properties of the fields and of the shield.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2006, 12, 2; 195-200
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Self-diagnosis method for checking the wayside systems for wheel-rail vertical load measurement
    Autorzy:
    Cortis, D.
    Giulianelli, S.
    Malavasi, G.
    Rossi, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/374395.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    wayside measurement system
    vertical forces
    wheel-rail contact forces
    self-diagnosis methods
    przydrożny system pomiarowy
    siła pionowa
    siły nacisku koło-szyna
    Opis:
    Nowadays, wayside measurement systems of wheel-rail contact forces have acquired great relevance for the monitoring of rolling stock, especially for freight trains. Thanks to these solutions, infrastructure managers can check and monitor the status of rolling stock and, when necessary, impose corrective actions for the railway companies. On the other hand, the evaluation of contact forces is part of the rolling stock authorisation process [1] and a mainstone for the study of the running stability. The data provided by these measurements could give useful information to correlate the wear of the track with the frequency of applied loads, helping in the development of a better maintenance strategy of railway networks [2]. In this paper, the monitoring of vertical forces is based on the SMCV (Vertical Loads Monitoring System) method, where shear strains of the rail web are measured with a simple combination of four electrical strain gauges, placed on both sides of the rail web along each span. The research has identified self-diagnosis methods for the SMCV system to ensure the reliability and the quality of the measurements and to extend the knowledge of the system. The recorded signals have been processed and converted into easily interpretable physical quantities by means of MATLAB® algorithm.
    Źródło:
    Transport Problems; 2017, 12, 4; 91-100
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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