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Abstract

This paper deals with the acceptability (AKC) and perceived concentration of pollutants (D) emitted by occupants in relation to the specific enthalpy (h) and relative humidity (qi) of indoor air. Measurements of AKC/D/, described by semilogarithmic function depend significantly on both In h and In (jl. The equation fits to the data published in the literature in a reasonably good way. Therefore, it indicates that the linear function between AKC and h which is commonly used in literature yields rough approximations. The proposed equation allows for the validation of the indoor mieroclimatc and brings an idea how to make measurements of the perceived air quality instrumentally and how to control the air conditioning process.
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Authors and Affiliations

Rudolf Burek
Bernard Połednik
Andrzej Raczkowski
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Abstract

The availability of drinking water is one of the several problems humans face, considering that its availability is reduced to 0.80% of the existing fresh water. Then, coagulation-flocculation is a stage of this treatment. It is a process that agglomerates the suspended particles in a larger (floc) that could be separated by sedimentation and filtration processes to make the water drinkable. So, this work aimed to evaluate the effect of the dose of coagulant of yam starch ( Dioscorea rotundata) and the speed of agitation in the turbid water treatment process. For which the yam starch was extracted by implementing two methods which were NaOH and H2O, using centrifugation at 1500 rpm for 10 min, and adjusting the pH with HCl and NaOH 0.20 M, for later determining the effect of agitation speed (rpm) and coagulant concentration (ppm) on the percentage of turbidity removal, pH, and colour, to be compared with a synthetic coagulant. A yield of 42.60% was found in the wet base. The natural coagulants extracted with NaOH presented better turbidity removal, with a percentage of 92.48% at an agitation speed of 40 rpm and a concentration of 250 ppm. It can be concluded that natural yam coagulant can be recommended for use in the coagulation stage in the raw water treatment process for subsequent conversion to drinking water.
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Authors and Affiliations

Ángel Villabona-Ortíz
1
ORCID: ORCID
Candelaria Tejada-Tovar
1
ORCID: ORCID
Rodrigo Ortega-Toro
2
ORCID: ORCID
Natalia Licona Dager
1
Marta Millan Anibal
1

  1. Universidad de Cartagena, Faculty of Engineering, Department of Chemical Engineering, Cartagena de Indias, Colombia
  2. Universidad de Cartagena, Faculty of Engineering, Department of Food Engineering, Avenida Del Consulado 48-152, Cartagena 130014, Colombia
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Abstract

Article deals with a fractional and chemical composition of sediments from the sediment reservoir in Ilyash village, Ferghana region, Uzbekistan (Syr Darya river basin) and analyses their feasibility. As a key factor in the study of this process was considered the fractional and agrochemical composition of sediments moving with water in the sediment reservoir, and the change of their share in the water along the length of the reservoir. The main composition of the sediments in reservoir consists of fractions >0.25 and 0.25–0.01 mm, with the average fraction of 69% in the inlet and 60% in the outlet. The river sediments are rich in minerals important for the irrigated cropland. Based on the results we conclude that it is possible to regulate the number of chemical compounds in the water by controlling the exploitation regime of reservoir and the sedimentation process in it.
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Bibliography


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ARIFJANOV A., SAMIEV L., AKMALOV S. 2019c. Dependence of fractional structure of river sediments on chemical composition. Interna- tional Journal of Innovative Technology and Exploring Engineering. Vol. 9(1) p. 2646–2649. DOI 10.35940/ijitee.l2944.119119.
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Authors and Affiliations

Tatiana Kaletova
1 2
ORCID: ORCID
Aybek Arifjanov
2
ORCID: ORCID
Luqmon Samiev
2
ORCID: ORCID
Farrukh Babajanov
2
ORCID: ORCID

  1. Slovak University of Agriculture in Nitra, Tr. A. Hlinku 2, 94976 Nitra, Slovak Republic
  2. Tashkent Institute of Irrigation and Agricultural Mechanization Engineers, Uzbekistan
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Abstract

This paper focuses on the thermal behavior of the starch-based binder (Albertine F/1 by Hüttenes-Albertus) used in foundry technology of molding sand. The analysis of the course of decomposition of the starch material under controlled heating in the temperature range of 25-1100°C was conducted. Thermal analysis methods (TG-DTG-DSC), pyrolysis gas chromatography coupled with mass spectrometry (Py-GC/MS) and diffuse reflectance spectroscopy (DRIFT) were used. The application of various methods of thermal analysis and spectroscopic methods allows to verify the binder decomposition process in relation to conditions in the form in both inert and oxidizing atmosphere. It was confirmed that the binder decomposition is a complex multistage process. The identification of CO2 formation at set temperature range indicated the progressive process of decomposition. A qualitative evaluation of pyrolysis products was carried out and the course of structural changes occurring in the presence of oxygen was determined based on thermo-analytical investigations the temperature of the beginning of binder degradation in set condition was determined. It was noticed that, significant intensification of Albertine F/1 sample decomposition with formation of more degradation products took place at temperatures above 550ºC. Aromatic hydrocarbons were identified at 1100ºC.

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Authors and Affiliations

K. Kaczmarska
S. Żymankowska-Kumon
B. Grabowska
A. Bobrowski
S. Cukrowicz
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Abstract

In this paper results of microstructural observations for series of CuZn39Pb2 alloys produced from qualified scraps are presented. The individual alloy melts were differentiated in terms of thermal parameters of continuous casting as well as refining methods and modifications. Structural observations performed by SEM and TEM revealed formation of different types of intermetallic phases including “hard particles”. EDS results show that “hard particles” are enrich in silicon, phosphorus, iron, chromium and nickel elements. Additionally, formation of Al-Fe-Si and Al-Cr in alloy melts was observed as well. It was found that quantity and morphology of intermetallic phases strongly depends upon the chemical composition of raw materials, process parameters, modifiers and refining procedure applied during casting. It was observed that refining process results in very effective refinement of intermetallic phases, whereas modifiers, particularly carbon-based, results in formation of large particles in the microstructure.

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Authors and Affiliations

A.W. Bydałek
A. Kula
L. Błaż
K. Najman
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Abstract

When exposed to high cadmium concentrations applied to the soil, the abiotic stress-tolerant, semi-halophytic C3/CAM (Crassulacean Acid Metabolism) photosynthetic intermediate plant Mesembryanthemum crystallinum L. demonstrates negligible poisoning symptoms with well-protected photochemical activity. Gas exchange analysis of the soil-grown plants exposed to Cd concentrations ranging from 0.01 to 10.0 mM revealed stimulation of net photosynthesis in the C 3 metabolic state, and this observation coincided with an increase in the transpiration level. The obtained results suggest that the initial action of Cd after the administration of this heavy metal is the stimulation of stomata opening.
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Bibliography

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[23]. Nosek, M., Kaczmarczyk, A., Śliwa, M., Jędrzejczyk, R., Kornaś, A., Supel, P., Kaszycki, P. & Miszalski, Z. (2019). The response of a model C3/CAM intermediate semi-halophyte Mesembryanthemum crystallinum L. to elevated cadmium concentrations. Journal of Plant Physiology, 240, 153005. DOI:10.1016/j.jplph.2019.153005
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Authors and Affiliations

Adriana Maria Kaczmarczyk
1
ORCID: ORCID
Michał Nosek
2
Paweł Kaszycki
3
ORCID: ORCID
Paulina Supel
3
ORCID: ORCID
Zbigniew Miszalski
1

  1. W. Szafer Institute of Botany, Polish Academy of Sciences, Kraków, Poland
  2. Institute of Biology, University of the National Education Comission Kraków, Poland
  3. Department of Plant Biology and Biotechnology, University of Agriculture in Kraków

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