Papers by Panagiotis Sinioros
A methodology for occupational exposure assessment of organic pollutants emitted through aerosols from recycling of e‐waste
Environmental Quality Management, Sep 26, 2023
Recycling, Dec 3, 2023
The need to reduce energy consumption in buildings, the emergence of light-emitting diode (LED) l... more The need to reduce energy consumption in buildings, the emergence of light-emitting diode (LED) lamps in lighting around 2010, their long lifetime, and the 2025 target to use only LED lamps are changing the existing composition of Category 3 waste electrical-electronic equipment (WEEE) and creating expectations for simple, high-concentration recycling streams. In this study, multi-layer ceramic capacitors (MLCCs) detached from the lighting sector's WEEE were characterised for the presence of rare earth elements (REEs) and precious metals (PMs). Their digestion was carried out with HNO 3 and aqua regia on a heating plate and characterised using inductively coupled plasma optical emission spectroscopy (ICP-OES) and scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDX). The contents of REEs and PMs found in the MLCCs were 0.84 wt% and 0.60 wt%, respectively, and create an economic stored value that is essentially defined by PMs of 98.67% and by palladium (Pd) of 78.37%. The analysis showed that the content of the main elements was: neodymium (Nd) 0.366 wt%, yttrium (Y) 0.220 wt%, dysprosium (Dy) 0.131 wt%, silver (Ag) 0.467 wt%, and Pd 0.105 wt%. These results indicate the need for selective removal and separate recycling processes of MLCCs from WEEE drivers.
Agile Business Systems Development Paradigms—Technological and Human Resource Perspectives
Smart innovation, systems and technologies, 2023
Numerical Analysis of the Electrical and Thermal Characteristics of Capacitor for Dielectric Heating
Trace Metals In Water And Soils In The Vicinity Of A Small – Medium Waste Electrical And Electronic Equipment Recycling Plant
Global NEST International Conference on Environmental Science & Technology
A research conducted in order to investigate the environmental impact of an e-waste recycling pla... more A research conducted in order to investigate the environmental impact of an e-waste recycling plant to the soil and water resources of the surrounding area. Therefore trace elements in both water and soil samples were determined with Inductively Coupled Plasma – Mass Spectrometry (ICP-MS). Heavy metals in water comply with drinking water criteria, except Pb. Pb, Concentrations of Pb, Cr, Ni, Cu, Mn, Zn were higher in the rainwater collection tank (43.50, 10.90, 18.87, 81.17, 177.99, 330.17 μg/L) than the surficial water inside (8.93, 1.27, 4.97, 17.0, 91.87, 72.97 μg/L) and outside the plant (4.18, 1.28, 1.60, 10.35, 26.21, 12.10 μg/L). Ecological risk of soil samples was assessed with Enrichment Factors. Enrichment factor, for soils showed low to moderate enrichment. The more enriched soil samples in Cu, Pb, Zn, Cd and Hg were two collected west of the company S19 and S20 and two samples collected east S9 and S10.
State equations for nondegenerate LECs using NA-VCS
Advances in Electrical and Computer Engineering
NA-VCS and MA-VVS methods for dc LECs
Advances in Electrical and Computer Engineering
Infrared Thermoluminescence Glow Curves of Rare Earth Doped Calcium Fluoride
Radiation Protection Dosimetry, 1993
On the basis of experiences in measuring infrared thermoluminescence signals of TLD-300 detectors... more On the basis of experiences in measuring infrared thermoluminescence signals of TLD-300 detectors with a silicon semiconductor photodiode, further rare earth doped CaF 2 crystals were studied with regard to their TL emission in the near infrared spectrum. The dopant elements were Tm, Gd, Nd, Er and Eu. The crystals were grown using the Stockbarger-Bridgeman method in a high vacuum furnace. The measurements of the IR-TL signals in an IR-TL reader with a photodiode are reported
Applied Radiation and Isotopes, 1994
Scientific findings reported here show that TL-emission lines are also possible in the near i.r.-... more Scientific findings reported here show that TL-emission lines are also possible in the near i.r.-spectrum. CaF,:Tm, CaF,: Dy and CaSO,: Dy emit TL-light of high intensity in the near i.r. region, which can be measured with photodiodes and which is useful for dosimetry.
Small-Capacity Gold Production Tests From Waste Desktop Computers
Environmental Quality Management, 2015
This article describes a procedure for the hydrometallurgical recovery of gold from waste compute... more This article describes a procedure for the hydrometallurgical recovery of gold from waste computer printed circuit boards (PCBs) and central processing units (CPUs). The wastes processed within the recovery installation described in this article were derived from desktop computers, the parts of which were manually sorted to select those components found to be rich in gold content. X-ray fluorescence measurements showed that considerable amounts of gold are contained in the “finger” terminals of the PCBs as well as in the CPUs. This article describes the chemical processes for recovering gold from these parts. In addition, the article covers the emissions control apparatus that is capable of eliminating the nitrogen oxides (NOx) and sulfur dioxide (SO2) emissions produced by the recovery process. The main costs arising from the overall procedure are for personnel utilization. Approximately 60 work hours from one worker are required to process 1.75–1.85 tons of unprocessed desktop computer waste to produce gold in the form of sediments. The quantity of gold recovered from this amount of waste computers can reach up to 35 grams with a standardized purity of 21 karats. The overall recovery procedure takes eight consecutive calendar days to accomplish.
This paper presents two systematic methods for solving dc Linear Electric Circuits (LECs): Nodal ... more This paper presents two systematic methods for solving dc Linear Electric Circuits (LECs): Nodal Analysis with Virtual Current Sources (NA-VCS), applicable to planar or nonplanar LECs and Mesh Analysis with Virtual Voltage Sources (MA-VVS), applicable to planar LECs only. To apply these methods, the nonconvertible voltage or current sources (independent and dependent) are re-placed by Virtual Current or Voltage Sources (VCS, VVS), respectively. Solving any dc LEC in this way is ex-tremely systematic and straightforward, since most of the work is done by inspection and some of the matrix manipulations required are easily implemented. Since the proposed methods are well algorithmized, they can by used in most modern simulators of analog networks. Keywords: dc LEC, inspection, mesh analysis, nodal analysis, nonconvertible current source, nonconvertible voltage source, virtual current source, virtual voltage source.
Measurements of Electric and Magnetic Fields Using Optoelectronic Telemetry
Advances in Electrical and Computer Engineering, 2007
ABSTRACT In the vicinity of the electric power network and near to the power electrical equipment... more ABSTRACT In the vicinity of the electric power network and near to the power electrical equipments the electromagnetic environment includes electric and magnetic fields, mainly at the spectral area of Extreme Low Frequencies (ELF). In some cases, very close to the working or areas of habitants, it is important to observe the values of the electric and magnetic fields and to compare those values with the appropriate biological limits and/or to the Electro-Magnetic Compatibility (EMC) limits. In these special cases the fields must be measured successfully and carefully. Therefore, the measurement equipment must have high accuracy and be as small as possible, in order to avoid any impact to the measured field values from the physical presence of the unit or of the observer. For application in these cases we develop an optoelectronic telemetry system, for measurements, of the ELF electric and magnetic fields, with small sensors in the measurement point and all the rest equipment in small distance. The system includes two electro-magnetic optoelectronic sensors, an optical transceiver and all the measurement electronic circuits. By that method we applied the two appropriate optoelectronic sensors at the measured point and in some distance (up to 100m) an optical (laser) transceiver followed by the measurement circuits. If the outcome laser beam from the transceiver strikes the optoelectronic part of these sensors. Then, that part is triggered to modulate the reflected and returned laser beam. The modulation value depends on the field value. At the receiver part of the optical transceiver, a special optical demodulator extracts the modulation signal from the incoming laser beam and the following measurement electronic circuits extracts the information with the measurement values of the electric and magnetic fields. We must point out that the few mW red beam from a diode laser, has very low power to be an injury problem to the observer or to any other person, except the case when someone stares at the laser beam (intrabeam view). In our paper we give details of the optoelectronic measurement unit, followed by the calibrating and testing results in two applications in Athens.
International Journal of Electrical Engineering Education, 2009
This paper presents a systematic method for obtaining the state equations for Nondegenerate Linea... more This paper presents a systematic method for obtaining the state equations for Nondegenerate Linear Electric Circuits (NDLECs), based on Nodal Analysis with Virtual Current Sources (NA-VCSs). Obtaining the state equations using NA-VCS is extremely systematic and straightforward since most of the work is done by inspection and the required matrix manipulations are easily implemented. To apply the proposed method, all circuit energy-storage elements are replaced by ideal independent sources, while the nonconvertible voltage sources are replaced by virtual current sources. As a result, all NDLECs (planar or nonplanar) are treated in a similar way, regardless of the circuit complexity. Since the proposed method is well algorithmized, it can be used in most modern simulators of analog networks.
Renovation and Reuse of Waste Electrical and Electronic Equipment in the Direction of Eco-Design
Nowadays there is a higher need of strict and broader legislation in waste electrical and electro... more Nowadays there is a higher need of strict and broader legislation in waste electrical and electronic equipment (WEEE) recycling industry to reduce environmental effects of WEEE. Environmental challenges include pollution, exhaustion of natural resources, waste management and reduction of landfills. High speed in technological development in many sectors puts many products in great challenge of obsoleting almost immediately after their purchase. In particular, this is the fate for electrical and electronic equipment (EEE). They are forever-improving and incorporate state of the art innovations. This provide many benefits; however, at the same time, its expansion results in rapidly growing waste stream of WEEE. WEEE contains a combination of all these situations, including for example, batteries, plastics of quality, precious metals and toxic soldering metals. The reuse and renovation of WEEE are therefore very critical because of its significant ecological environmental impacts. Sust...
Trace Metals Contamination of In Water And Soils In The Vicinity Of A Small – Medium Waste Electrical And Electronic Equipment Recycling Plant
Environmental Progress & Sustainable Energy
E-Government in a New Technological Ecosystem
Informatica Economica
E-Democracy and E-Voting Using Emerging Technologies
Proceedings of the 19th International Conference on INFORMATICS in ECONOMY Education, Research and Business Technologies
A preliminary study of the concentration of special purpose elements and precious metals in the enriched precipitates produced by a wet method of cathode-ray tube recycling
Journal of Material Cycles and Waste Management
Heavy Metals Inhalation Exposure Analysis from Particulate Matter Emitted from Dry and Wet Recycling Processes of Waste Electrical and Electronic Equipment
Environmental Progress & Sustainable Energy
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Papers by Panagiotis Sinioros