Wyniki wyszukiwania - Biblioteka Nauki

1

Shrinkage and Absorption of Sand Concrete Containing Marble Waste Powder

100%

Djebien R. , Abbas Y. , Bouabaz A. , Ziada Y. N.

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tom Vol. 32, no. 1

240--254

EN

In the context of growing scarcity of natural resources, the high demand of aggregates and the difficulties to open new quarries, several studies were carried out to study the possibility of reuse of waste and industrial by-products to replace traditional materials which would run out, replace materials when transport distances increase to reduce construction costs and protect the environment. This experimental study aims to investigate the effect of marble waste used as powder on the shrinkage and absorption of sand concrete in order to reuse it in the production of sand concrete. To achieve this goal, several sand concrete mixtures containing different substitutions rates of marble powder (4, 8 and 12%), and different Water / Cement ratio (0.71, 0.74, 0.77) were produced. Then, the evolution of the shrinkage and absorption values of sand concrete mixtures was studied. The obtained results showed that marble waste powder plays a positive role in reducing of shrinkage and absorption values of sand concrete and lead to the production of eco-friendly sand concrete.

2

Amine activators of CO2 absorption in industrial conditions

100%

Bińczak G. , Pohorecki R. , Moniuk W. , Możeński C.

Chemical and Process Engineering

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2019

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tom Vol. 40, nr 2

157–-165

EN

Twenty-eight two-, three-, four-, and five-component amine mixtures have been evaluated as possible activators of CO2 absorption into aqueous carbonate/bicarbonate solutions. Measurements were per- formed using a pressure autoclave with a sparger at conditions close to industrial ones. On the basis of these results, a formula for a new, more efficient amine activator named INS13 was developed. The activator was tested both in a pilot plant and on an industrial scale in an ammonia plant producing 300 tons/day of ammonia. Activator INS13 was applied in a number of ammonia plants in Poland and abroad.

3

Investigation of new potential amine activators for carbon dioxide absorption in carbonate solutions

100%

Bińczak G. , Pohorecki R. , Moniuk W. , Możeński C.

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tom Vol. 39, nr 4

353-–365

EN

Results of an extensive research program, aimed at finding new, more efficient activators of carbon dioxide absorption into aqueous carbonate/bicarbonate solutions are presented. Both single amines (2-ethyl-aminoethanol, 2-isopropyl aminoethanol, piperazine, tetraethylenepentamine, N-ethyl-piperazine and glicyne) and amine mixtures have been investigated. Absorption rate measurements were conducted in a laminar-jet absorber. Reaction rate constants for the particular activators were determined. Mixtures of aliphatic amines with cyclic amines, as well as mixtures of cyclic amines with cyclic amines were found to exhibit synergetic effect. Such amine mixtures might be used as new promoters for CO2 absorption in carbonate solutions in the modified Benfield process.

4

Moisture Management Properties of Seersucker Woven Fabrics of Different Structure

80%

Matusiak M.

Fibres & Textiles in Eastern Europe

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2019

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tom Vol. 27, no. 3 (135)

43--50

EN

Moisture management is defined as the controlled movement of water vapour and liquid water (perspiration) from the surface of the skin to the atmosphere through the fabric. The ability of moisture transport is a very important feature of textile materials from the point of view of the physiological comfort of usage clothing made of these materials. Among the different textile materials (woven, knitted and nonwoven), seersucker woven fabric is considered as having good comfort-related properties. The fabrics are characterised by the occurrence of puckered and flat strips in the warp direction. The puckered effect generates air spacesbetween the body and the fabric, keeping the wearer cool in hot conditions as the puckered area holds the fabric away from the skin during usage. In the work presented, seersucker woven fabrics of different patterns of the puckered strips were investigated. The aim of the work was to analyse the relationship between the structure of seersucker fabrics and their moisture management properties. Measurement of the moisture transport properties of seersucker woven fabrics was made using a Moisture Management Tester M290, produced by SDL Atlas. Investigations performed showed that the properties of seersucker woven fabrics characterising their ability to transfer liquid moisture are different depending on the variant of the repeat of puckered strips.

PL

Tkaniny gofrowane charakteryzują się występowaniem wypukłych i płaskich pasków w kierunku osnowy. Tworzą trójwymiarową strukturę tkaną. Taka struktura wpływa znacząco na właściwości tkanin. W pracy wykonano badania tkaniny gofrowanych o różnym raporcie gofrowania. Celem pracy była analiza zależności między strukturą tkanin gofrowanych a ich właściwościami charakteryzującymi zdolność tkanin do transportu wilgoci. Pomiary właściwości transportu wilgoci tkanin gofrowanych wykonano za pomocą przyrządu Moisture Management Tester M290 firmy SDL Atlas. Przeprowadzone badania wykazały, że właściwości tkanin gofrowanych charakteryzujących ich zdolność transportu wilgoci w postaci płynnej różnią się w zależności od raportu efektu gofrowania.

5

TiO2/Ag modified carpet fibres for the reduction of nicotine exposure

80%

Cieślak M. , Schmidt H. , Świercz R. , Wąsowicz W.

Fibres & Textiles in Eastern Europe

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2009

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tom Vol. 17, no. 2 (73)

59--65

EN

The study was carried out to analyse the susceptibility of textile polymers, polyamide and polypropylene, used in the manufacture of floor coverings, to the sorption of nicotine from environmental tobacco smoke (ETS) polluted air and nicotine itself. Polypropylene fibres were modified by means of titanium dioxide doped with nanosilver particles (TiO2/Ag). The decomposition kinetics of nicotine adsorbed by polypropylene fibres and the catalytic effect of TiO2/Ag on the decomposition of nicotine were investigated. Having analysed the concentrations of nicotine adsorbed from ETS by polyamide fibres and polypropylene fibres, it was found that the latter demonstrate a much stronger sorption of nicotine. It was also observed that the nanomodifier TiO2Ag substantially accelerates the photocatalytic decomposition of nicotine adsorbed by polypropylene fibres.

PL

W pracy przedstawiono badania podatności włókien poliamidowych i polipropylenowych, stosowanych do produkcji włókienniczych pokryć podłogowych, do sorpcji nikotyny pochodzącej z powietrza zanieczyszczonego dymem tytoniowym (ETS) oraz nikotyny w postaci czystej. Włókna polipropylenowe modyfikowano ditlenkiem tytanu pokrytym nanocząstkami srebra (TiO2/Ag). Badano kinetykę rozkładu nikotyny zaadsorbowanej przez włókna polipropylenowe oraz wpływ katalitycznego działania TiO2/Ag na kinetykę jej rozkładu. Stwierdzono, że włókna polipropylenowe wykazują większą podatność do sorpcji nikotyny niż włókna poliamidowe. Wykazano również, że modyfikacja TiO2/Ag znacznie przyspiesza fotokatalityczny rozkład nikotyny zaadsorbowanej przez włókna polipropylenowe.

6

Comparative Analysis of Three Different Negative Emission Technologies: BECCS, Absorption and Adsorption of Atmospheric CO2

80%

Talei S. , Soleimani Z.

Civil and Environmental Engineering Reports

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2021

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tom Vol. 31, no. 3

99--117

EN

Negative Emission Technologies (NETs) are generally considered as vital methods for achieving climate goals. To limit the rise in the global average temperature below 2°C, a large number of countries that participated in the Paris agreement was virtually unanimous about the effective collaboration among members for the reduction of CO2 emissions throughout this century. NETs on the ground that can remove carbon dioxide from the atmosphere, provide an active option to achieve this goal. In this contribution, we compare limiting factors, cost, and capacity of three different NETs, including bioenergy with carbon capture and storage (BECCS), absorption and adsorption. Although there are several advantages for capturing CO2, still some constraints regarding the high operational cost of NETs and industrial condition of these technologies as a method of climate change mitigation is not clear. Thereby no single process can be considered as a comprehensive solution. Indeed, any developed technologies, in turn, have a contribution to the reduction of CO2 concentration. Extensive research needs to be done to assess and decrease NETs costs and limitations.