Abstract In designing an efficient photovoltaic system, the meteorological data of the system location must be considered. Field data registered over years prove the importance of the implementation site characteristics in the design and optimal exploitation of a PV system, because wetting and atmospheric gaseous and particulate pollution can strongly distort the incident solar radiation. Thus, in addition to the efficiency of the solar module, the tracking efficiency, the clouds crossing fac...
Autori: Dorin Valentin Diaconescu, , Ioana Sinziana Hermenean, Maria Monica Vatasescu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25464

? Environmental Engineering and Management Journal, Vol. 9 Nr. 4 ? THE PROTECTION OF EQUIPMENTS USING VOLATILE INHIBITORS ? CONTINUOUS SURFACE TEMPERATURE MONITORING TO ESTIMATE SENSIBLE HEAT LOSS BY BUILDING FINISHES ? RECYCLE OF POLYAMIDE DYEING WASTEWATER FOLLOWING DECOLORIZATION WITH POLYMERIC SORBENTS ? PERFORMANCE EVALUATION OF AMINO ACID SALT-BASED COMPLEX ABSORBENTS FOR CO2 CAPTURE ? ADSORPTION EQUILIBRIUM STUDIES ON COPPER (II) IONS REMOVAL BY NATURAL WASTE USIN...
Autori:
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25666

The permanent magnet EDS train has been considered to be one of the most promising urban transportation vehicles due to its particular characteristics: simple configurations, low energy consumption, low noise, and suitable for high speed conditions. In order to study the characteristics of permanent magnet Electrodynamic Suspension (EDS) system, an experimental mechanism was established in this paper. The optimization of Halbach magnet array has been carried out and appropriate track for the EDS...
Autori: Zhiqiang Long, Guang He, Ning He, Zhizhou Zhanghttp://www.ecozone.ro/reviste.php?RID=25713

Abstract:In order to capture as much solar energy as possible, the photovoltaic converter has to follow the sun movement during a day; thiscan be achieved by a tracking system. Most tracking systems have complex and costly structures that can provide wide anglevariations. This paper presents a geared linkage that is build up by a planetary system of gears fitted on a linkage, and thus helpsin reaching wide angles. Starting from a patented linkage, which reaches ≈200° angular strokes, by a...
Autori: Dorin Diaconescu, Ioana Hermenean, Nora Creanga
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25736

Abstract:A comparative analysis is drawn on the energetic responses numerically simulated for Brasov, Romania location, delivered bytwo mono-axial pseudo-equatorial STCs (solar thermal collectors): a flat plate STC and a STC with heat pipes; the two systemsare destined for future implementation on Transilvania University Campus. Accordingly, two tracking programs are consideredfor the diurnal motion: a) of 1h constant duration steps, for school courses interval (September-June) and b) 1-step pro...
Autori: Maria M. Vatasescu, Veronica E. Dombi
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25740

Abstract:For the optimal working of the concentrating photovoltaic systems (CPV), these are usually tracked, and the accuracy required infollowing the sun path is much higher than in non-concentrating system. The paper focuses on the synthesis of the optimal steptracking program of an azimuth tracking system, used for accurate tracking of a CPV system. The paper presents the synthesismodelling algorithm and the numerical simulations for a CPV system, orientated with an azimuth tracking system, i...
Autori: Ioana Sinziana Hermenean, Ion Visa
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25748

Abstract:Energy mix used in "Solar House" is currently composed of about 50% renewable energy sources (geothermal energy) and 50%conventional sources of energy (mainly electricity from national grid and less than 10% natural gas). The geothermal energy isextracted by the mean of a ground coupled heat pump which assures the heating load of the "Solar House" and the preparation ofdomestic hot water. The peak load in heating period is covered by a natural gas boiler and the electricity to drive the...
Autori: Bogdan Burduhos, Ion Vişa, Macedon Moldovan
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25756

Abstract:It is of major importance that the mechanical structures and components of a photovoltaic (PV) system to have the same durabilityas the PV modules. The embodiment design process of the mechanical structure becomes significant as the results provide anoverall view of the PV system durability. The performance of the mechanical system must be attained based on functional andoperational requirements of the PV system. Therefore, the modelling and theoretical analysis of the mechanical behavi...
Autori: Bianca Butuc, Gheorghe Moldovean, Radu Velicu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25757

Abstract:The paper presents a method to improve the efficiency of a photovoltaic (PV) string by employing a mono-axis trackingmechanism. The tracking system was optimized so that it has minimum energy consumption during tracking. The PV stringsimultaneously changes the daily position using a linear actuator which transmits the motion to all modules by a rack-pinion gearmechanism. The system is designed in virtual prototyping concept with the following software solutions: for the solid modeling -...
Autori: Cătălin Alexandru, Nicoleta-Irina Tatu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25766

Abstract:The present study proposes a comparative analysis on the clean electric energy response given by two types of PV (photovoltaic)tracking systems implemented on the same location: the azimuth and the pseudo-equatorial. The analysis is done based on analgorithm applied on the two-axes and one-axis systems. The tracking is done according to various laws, obtained by combiningdaily, seasonal and annual tracking programs. The algorithm and the comparative analysis are exemplified, by numerica...
Autori: Dorin Diaconescu, Maria Monica Vatasescu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25770

Abstract:This paper illustrates a detailed analysis of specific problems and limitations of a WSN designed for an environmental protection/wildlife tracking application. Since the main challenge in designing the network is energy minimization for activities that does not concern detection itself, we will concentrate on methods (and results) to achieve that. For data transmissions, physical and MAC layers were defined in ZigBee (IEEE 802.15.4) and WiFi (IEEE 802.11b) standards....
Autori: Alexandru Frujină, Alina-Mihaela Bădescu, Octavian Fratu, Simona Halunga
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25796

AbstractA case-control study was conducted in two Romanian counties (Alba and Cluj) in order to investigate lung cancer risk due toresidential radon exposure. Two hundred and forty-one subjects were included, of which 104 cases and 137 controls. Residentialradon concentrations were monitored using CR-39 track detectors, exposed over a period of at least 6 months. The odds ratioswere estimated by using multivariable logistic regression adjusted for age, sex, smoking status, education and family h...
Autori: Alexandra Cucoş Dinu, Constantin Cosma, Dan Rădulescu, Doina Todea, Dorin Iancu, Ionel Papuc, Loredana Roşca, Mircea Rişteiu, Tiberius Dicu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26011

Abstract This paper presents some optical and microphysical properties of aerosols measured over the Cluj-Napoca city, at the Faculty of Environmental Science and Engineering, Babeş-Bolyai University. This site is part of the Romanian Atmospheric 3D Research Observatory (RADO) and the Aerosol Robotic Network (NASA-AERONET) and is equipped with the only sun and sky tracking radiometer (Cimel CE 318A sun-photometer) in Transylvania. By analyzing Direct Sun measurements like Aero...
Autori: Nicolae Ajtai
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26105

Abstract Environmental degradation is today one of the great problems of mankind. Not only the need to exploit, but also the necessity to protect and preserve the natural environment have led to the adoption of specific rules for the prevention and remediation of environmental damages, according to EU standards. Taking into account that any human intervention on the natural and anthropogenic environment can lead to ecological risk diversification, occurrence of accidental pollut...
Autori: Aurica Grec
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26130

AbstractThis paper analyzes spatial effect of urbanization level, land use efficiency and their coordinative development degree of Xinjiangfrom 1995 to 2010 based on Exploratory Spatial Data Analysis and coordinative development degree model. It was found that the urbanization level and land use efficiency take on apparent spatial agglomeration. The hot spots concentrate mainly in the north slope of Tianshan Mountain and the corridor along South Xinjiang railway, and the cold spots distribute ma...
Autori: Yuanjing Qi
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26167

AbstractEnd-of-life tires are waste materials that pollute landscapes when they are disposed of in tire dumps. However, its life cycle is notfinished when they are scrapped. The rubber of end-of-life tires could be used for new purposes as construction material in roadrehabilitation. A gap-graded mix characterization was carried out in this work by means of laboratory and field performancetests. The mixture has a high content of crumb rubber (CR) by weight of bitumen. Crumb Rubber was added to t...
Autori: Victor F. Vázquez
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26577

Abstract The present study deals with the removal of Cr (VI) from aqueous solution by polypyrrole (PPy). Response surface methodology (RSM) was applied for the design and analysis of experiments in the optimization of pH, temperature, initial concentration, contact time and adsorbent dose during the removal of the Cr (VI). The optimum adsorbent dose, temperature, initial concentration of Cr (VI), pH and contact time were found to be 0.8 g, 46.5 oC, 187.5 mg/L, 5.3 and 15.4 min respectively. ...
Autori: Ehsan Hasani
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26614

Abstract In many coastal areas strong currents may occur from tidal effects, rivers discharges and high waves breaking due to abrupt changes in local topography. The modification of the wave fields by currents and vice versa need to be predicted by reliable nonlinear numerical models, when wave and current coexist along and around the approach tracks of the ports and harbors, or in the areas of ongoing offshore and coastal developments, or in areas subjected to intense navigation. Various wa...
Autori: Angela Ivan
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26695

Abstract In this paper, the structure and working principles of a microbial fuel cell (MFC) are analysed, and a mathematical simulation model of MFCs is established based on the electrochemical equation, kinetic equation and material balance equation of a MFC. A simulation analysis and discussions are conducted in a MATLAB environment to investigate the effect of acetate concentration, influent flow and external resistance on the performance of a MFC system. The simulation model is demonstra...
Autori: Aimin An
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26803

Sustainability is considered a key issue for development and growth amongst governments, policymakers, researchers, and the public. In this context, indicators for sustainability are essential to measure and monitor progress and to indicate improvements that are needed, in order to achieve the sustainable development. Over the time many indicators were developed as individual or integrated indexes. Recently a new family of sustainability indicators were developed and used to assess the pressure ...
Autori: Cristina Ghinea
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27339

Working in confined (limited) spaces represents a risk factor generating unwanted accidents or events, having an impact on human health. The success of intervention and rescue operations in toxic or chemical aggressive environments lies in optimal and efficient design of the training process for rescue personnel, which also includes rescue operations in confined spaces. The paper presents the scientific research behind designing and building a complex training facility with different training t...
Autori: George Artur Găman
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27353

The intrinsic safety type of protection significantly increased in complexity during the last decades. Thus, it even provides the opportunity to use highly complex electronic circuits without involving a significant explosion risk within the oil industry or in power plants, but not limited to those two. In order to achieve this performance, the type of protection is based on three pillars: limiting of energy, heat and also fault tolerance. The potential failure of components, connections, and...
Autori: Marius Darie
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27950

Fire and explosion prevention requires the knowledge of the explosive or flammability parameters of combustible gases and vapours that can be found in industrial and civil environments, as well as the influence of certain substances in the process on these parameters. In some cases, pyrophoric sulphides can be formed and it is supposed that they may influence the known flammability parameters of the substances used in various industrial processes. In order to track the influence of iron sulp...
Autori: Maria Prodan
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27963

Invasive plant species, like Indigo bush (Amorpha fruticosa L.), Boxelder (Acer negundo L.), Japanese knotweed [Fallopia japonica (Houtt.) Ronse Decr] are altering the conservation status of terrestrial ecosystems along the Mureș Floodplain Natural Park in Romania. On a long run, and a large geographic scale, the invasive species have a high potential to generate a negative impact on the environment and the economy. Hence there is a stringent need of preventing, tracking down, and controlling i...
Autori: Oana BrĂŽnzan
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=28170

The Urban Tool for Air Quality (UTAQ) is a project funded by CAMS (Copernicus Atmosphere Monitoring Service) - ECMWF (European Centre for Medium-Range Weather Forecasts). UTAQ is a web-based tool with a user-friendly interface that allows users to evaluate current and forecasted air quality for the following 4 days at urban scale with high resolution (10-50 m). UTAQ, in the mobile version, allows citizens to evaluate and then to limit their air quality exposition thanks to the personal position...
Autori: Fabrizio Ferrari
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=28312

The paper analyses the Romanian consumer’s behavior concerning the use of electric scooters for transport. The aim of the study is to investigate Romanian youths’ intentions regarding the use of electric scooters in the development of a sustainable behavior. The present article is based on a quantitative research, coordinated by the authors, conducted among young participants from Romania. A questionnaire was created using a set of items measured on a five-point Likert scale, on the...
Autori: Ana-Maria Ionescu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=28338