Abstract Starting from the disadvantages of the polystyrene system – the most important being that they are not biodegradable and their life cycle is relatively small, up to fifteen years – there were conceived several structures for outside walls made of perforated bricks vertically disposed and filled with granular materials. In this manner the thermal resistance is improved knowing that in gaps bigger than twenty millimeters there appear convective streams which substantially decrease ...
Autori: Răzvan Giuşcă, Vladimir Corobceanu, Raluca Giusca
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25551

AbstractThe transport of gases and solvents in polymeric membranes is an important phenomenon with many technical applications, suchas the mixture separation using polymeric membranes, the polymeric membrane preparation, the polymer devolatilization and theselection of appropriate polymeric membranes for a certain process. In most membrane separation operations and manufacturing,equilibrium and diffusion data are required.Useful information on equilibrium and diffusion can be obtained from the s...
Autori: Ciprian Constantin Negoescu, Eugenia Teodora Iacob Tudose, Ioan Mămăligă, Nicoleta Bunduc
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25975

AbstractThe removal and determination of toxic heavy metal ions in aqueous solutions has been given much more attention over the pastfew years. In this paper, a removal and separation/preconcentration method for cadmium species on Poly S15-g-EMA100 (a kind ofpolystyrene-graft-ethyl methacrylate copolymer) in water samples was developed. Some experimental parameters, such assolution pH, sample flow rate, type and concentration of eluent, amount of adsorbent and effect of common matrix ions werein...
Autori: Harun Ciftci
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26317

AbstractMonitoring an unstable slope is quite important for environmental safety. Based on our previous studies, this paper presents athird-generation distributed optical fibre transducer. The operating mechanism of this novel transducer was analysed for itsresponse to a single concentrated and uniform load, and a theoretical study was conducted on the elongation of the bottomsurfacefibres of a bending resistance model at the phases of linear elasticity and total cross-section cut-off stage. A b...
Autori: Bang Liu, Dong-Yan Liu, Hu Luo, Jing-Cheng Liu, Qiao-Ying Yuan, Yun-Ju Luo, Zheng-Wei Zhu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26348

AbstractThe thermal and water insulation of buildings is extremely important. Currently, the most applied insulation materials in thebuilding sector are plastic foams and fibrous materials. Different types of polystyrene materials are used as water and thermalinsulators, e.g., expanded polystyrene (EPS) and extruded polystyrene (XPS). The differences between the different polystyrenematerials is found in their manufacturing processes and thus in their microstructure. Our research focuses on the ...
Autori: Ákos Lakatos
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26546

AbstractCurrently, thermal insulation of buildings is required from both an energy savings perspective and a money savings perspective.Insulation is primarily installed on the outer surface of the buildings. Weather and other circumstances can produce humidity thatcan act on the building structure, e.g., by changing its heat capacity, the heat transfer coefficient and/or other factors. As a result,it is important to measure the sorption behaviors of the construction materials. To perform sorptio...
Autori: Ferenc Szodrai
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26550

Wastewater treatment using sequencing batch reactor (SBR) has certain advantages over conventional activated sludge system. The performance of sequencing batch reactor in treating high C/N ratio was investigated with suspended polyurethane and polystyrene attached growth biomass configuration. A sequence of 4 hr HRT, 0.3 month SRT and 1kg COD/m3 was employed to study treatment efficacy. Treatment performance was assessed by means of chemical oxygen demand (COD), total nitrogen (TN) and total pho...
Autori: Beenish Saba
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27478

Nowadays, the polyolefins (polyethylene, polypropylene) are increasingly consumed in large amounts for many applications. This issue causes a concern regarding the environmental impact of the waste materials generated after the first use. Mechanical recycling of polyolefin wastes helps to conserve oil and gas resources and reduce the polymeric waste accumulation in environment. In this paper, the modification of some post-consumer polypropylene (rPP) properties coming from packaging processi...
Autori: Maria Râpă
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27493

This study undertakes to characterize through thermal analysis in dynamic conditions a wide range of building materials used for various types of insulation and presents for the first time a comparative analysis of their thermal stability. To this effect, the dynamic thermal analysis TG/DTG was applied. The results show a degradation resulting in one, two or three stages after a complex mechanism, with different mass loss, depending on the structure and atmosphere in which the thermal decomposit...
Autori: Andreea-Camelia Sprânceană
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27514

This paper presents the results of experimental tests on polymer concrete prepared with different wastes. Two types of polymer concrete mixes were compared. The control polymer concrete was obtained with epoxy resin, natural aggregates in two sorts (0-4 mm and 4-8 mm) and fly ash waste used as filler. To the control mix, both sorts of natural aggregate were replaced in different dosages by polystyrene granules waste. The influence of polystyrene granules as substitution of aggregate on density, ...
Autori: Andrei Burlacu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27599

• INFLUENCING FACTORS OF THE ACCEPTABLE AMOUNT OF COMPENSATION OF FARMERS FOR CONTROLLING FERTILIZER-INDUCED WATER POLLUTION    • DETERMINATION OF THE RARE EARTH METALS IN THE RED MUD FOR POSSIBLE UTILIZATION    • Fe(II) AND Mn(II) REMOVAL FROM CONTAMINATED GROUNDWATER BY ADSORPTION: A COMPARISON OF ACTIVATED CARBON AND PINE BARK    • RESPONSE OF UPLAND COTTON GENOTYPES TO SALINITY AT EARLY GROWTH STAGES    • KINETICS AND ISOTH...
Autori:
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27782

Geocomposite materials consisting of lightly cemented mixtures of expanded polystyrene beads (EPS) and backfill soils are commonly used as fillers and for the construction of light weight embankments. The constant normal stress (CNS) and constant volume (CV) direct shear parameters as well as the relationship between gradation properties of four residual granular backfill soils and direct shear parameters of lightly cemented mixture of EPS and backfill soils was evaluated. The maximum density an...
Autori: Felix Okonta
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27771

• INFLUENCING FACTORS OF THE ACCEPTABLE AMOUNT OF COMPENSATION OF FARMERS FOR CONTROLLING FERTILIZER-INDUCED WATER POLLUTION    • DETERMINATION OF THE RARE EARTH METALS IN THE RED MUD FOR POSSIBLE UTILIZATION    • Fe(II) AND Mn(II) REMOVAL FROM CONTAMINATED GROUNDWATER BY ADSORPTION: A COMPARISON OF ACTIVATED CARBON AND PINE BARK    • RESPONSE OF UPLAND COTTON GENOTYPES TO SALINITY AT EARLY GROWTH STAGES    • KINETICS AND ISOTH...
Autori:
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27729

• INFLUENCING FACTORS OF THE ACCEPTABLE AMOUNT OF COMPENSATION OF FARMERS FOR CONTROLLING FERTILIZER-INDUCED WATER POLLUTION    • DETERMINATION OF THE RARE EARTH METALS IN THE RED MUD FOR POSSIBLE UTILIZATION    • Fe(II) AND Mn(II) REMOVAL FROM CONTAMINATED GROUNDWATER BY ADSORPTION: A COMPARISON OF ACTIVATED CARBON AND PINE BARK    • RESPONSE OF UPLAND COTTON GENOTYPES TO SALINITY AT EARLY GROWTH STAGES    • KINETICS AND ISOTH...
Autori:
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27730

The paper presents the experimental results obtained on cement concrete with different types of waste and the analysis of their effects on density, compressive strength, flexural strength and splitting tensile strength. The tests results were compared with a control mix without aggregate substitution. The fly ash was used as replacement of cement and polystyrene granules, chopped plastic bottle (PET) and wood waste were used as substitution of 0-4 mm aggregate sort in different dosages from 0% t...
Autori: Vasilică Ciocan
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27978

The influence of Spathiphyllum “Sweet Silvio” flowers on indoor air quality (IAQ) and energy savings were studied experimentally in a bedroom, part of a 65 m2 three-room apartment, in Brașov, Romania. We used four 14 cm pots of Spathiphyllum “Sweet Silvio” with a total leaf surface of 134.29 cm2. The residential space has a low number of air exchange rates because exterior walls are insulated with 5 cm polystyrene, and windows have high-energy efficiency glass in ...
Autori: Gabriel Năstase
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27991