The aim of this article is to examine the effect of temperature, humidity, air velocity and CO2 concentration regarding the human behaviour in indoor environment with natural ventilation, i.e. without a ventilation device, or where there is forced ventilation or an air conditioning.
It is a prime aim to ensure a suitable comfort level in case of office buildings. The productivity of office employees is directly influenced by the comfort. Thermal discomfort and poor indoor air quality deteriorate the intensity and quality of human work. We investigated the comfort in office buildings with on-site measurements during the summer season. The office buildings were operating with different HVAC (Heating, Ventilating and Air-Conditioning) systems: ducted fan-coil with suspended ceiling, installation, non-ducted fan-coil with floor-mounted installation, active chilled beam with fresh air supply.
We evaluated the thermal comfort under PMV (Predicted Mean Vote), PPD (Predicted Percentage of Dissatisfied), the local discomfort based on DR (Draught Rate) and the IAQ (Indoor Air Quality) based on carbon dioxide concentration. The comfort measurements were evaluated. The measurements were evaluated with scientific research methods, comfort categories based on the requirements of CR 1752. The results of this comparison were presented in this article.
Authors:Gy. Lakatos, I. Csatári, T. Igaz, I. Gyulai, and I. Mészáros
This paper presents the results of the floristical examinations performed in the units of a former secondary sedimentation pond system in Hungary. The outcome of analyses on the chromium content of the plants is discussed. Beside the chemical analyses, observations on the plants, the characterization of the ecological state of plant stands adapted to heavy metal load. Results of the elemental analysis for heavy metals revealed that none of the plants constituting the natural vegetation can be treated as hyperaccumulator plant. A green cover and the detoxification process of Cr(VI) by plants is suggested to be more important than the present extensive phytoextraction procedure. It can be stated that due to the disturbance our investigated area has diverse vegetation, in addition these plants can tolerate a high concentration of heavy metals, and they are able to take up them.
Nanoparticle Concentration Eff. results max/increase % Comments [ 17 ] Water Al 2 O 3 0.2, 0.25, 0.3%wt 13% Al 2 O 3 , 11% Fe 2 O 3 Variable flow rate [ 18 ] Water Al 2 O 3 3, 1%vol 52.4, 73 Variable incident angles [ 19 ] Water TiO 2 0.05, 0.1, 0.2, 0.5%vol 56
protection of the public against indoor exposure to radon (90/143/Euratom)
Nagy É. H., Breitner D., Horváth Á., Szabó Cs. Study of a passive radon mitigation process and indoor radon concentration’s time dependence after
Authors:Mona M. Fawzy, Mohamed S. Kamar, and Gehad M. Saleh
). The measurement conditions were an accelerating voltage of 30 kV with a beam diameter of 1 μm for a counting time of 60–120 s and a minimum detectable weight concentration ranging from 0.1 to 1 wt%. Physical separation treatment for Abu Rusheid
Authors:G. Lizia Thankam and Neelakantan Thurvas Renganathan
to increase with high replacement level. Terrence [ 52 ] evaluated the efficacy of metakaolin in minimizing the expansion due to alkali-silica reaction (ASR). When HRM is used to replace up to 20% of OPC the alkali concentration of the pore solutions
Authors:Mariam Achbal, Abdellatif Khamlichi, and Fadoua El Khannoussi
transducer surface for the PA probe with inclined elements. The obtained results have shown a high concentration of the ultrasound beam on the focal point direction with reduced effect of side lobes. Fig. 7. Dimensionless displacement amplitude over the
Authors:Wisdom Okechukwu Egbujuo, Placid Ikechukwu Anyanwu, and Henry Chinedu Obasi
comparison with other commercial fillers. He reported that the mechanical properties of the vulcanizates filled with rice husk ash were comparable to those filled with inert fillers. The influence of fibre length and concentration on the physical properties