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vol. 33
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issue 2
255-262
EN
The article describes the testing of four selected samples of limestone originating from four commercially exploited deposits. The tests of sorbents included a physicochemical analysis and calcination in different atmospheres. The main aim of the tests was to determine the possibilities for using limestone during combustion in oxygen-enriched atmospheres. Tests in a synthetic flue gas composition make it possible to assess the possibility of CaCO3 decomposition in atmospheres with an increased CO2 concentration.
EN
With the rapid urbanization process and rapid economic growth, the building industry has emerged as one of the largest carbon emitters in the world. The built environment is thought to play an important part in a country's carbon emissions. Operational carbon emissions, also known as operational period emissions from the built environment, include emissions from other phases, like those in building and materials production, are included in the built environment's associated carbon emissions. It is thought that the fraction of carbon emissions embedded in a building will rise in the future. This is due to the increased usage of energy-saving devices to cut back on operational energy and the emissions that go along with it. These energy-saving technologies may also increase the number of building renovations, which would lead to an increase in carbon pollution. In this paper, the reasons causing carbon emissions in the construction sector are further discussed, along with potential extenuation measures.
EN
Porous superhydrophobic layer of low-density polyethylene (LDPE) was created by a simple approach on the Poly(vinylidenefluoride) (PVDF) hollow fiber membranes. Acetone and ethanol mixtures with different volume ratios were used as the non-solvent on the coating surface. A 5:1 (v/v) acetone/ethanol ratio provided a porous surface with a 152° ± 3.2 water contact angle. The high contact angle could reduce membrane wettability for better carbon dioxide capture when the membrane was used as gas-liquid contactor in absorption processes. To assess the effect of the created superhydrophobic layer, the pristine and modified membranes were tested in a CO2 absorption system for ten days. The results revealed that the absorption flux in the modified membrane was higher than that of pristine membrane.
10
63%
EN
Climate change has now become an inevitable truth. Anthropogenic CO2 emission accounts for 80% of total GHGs emission and is at the highest level (403 ppm) of CO2 observed in human history. According to the Global climate risk assessment, Nepal contributes only 0.01% of all global CO2 emissions and 0.025% of total GHGs emissions, but ranks 13th in the category of most vulnerable country. Nepal, being signatory of UN policies and strategies set out for global action, has begun implementing mitigation measures. Thus, Nepal’s government prioritizes climate change issues in its action plan, policies and acts. It is difficult. On one hand the poor economic countries such as Nepal are struggling under changing climatic circumstance, whereas on other hand, developed countries make this a political agenda. Still, alarmists and skeptics have their own opinion. Alarmists claim that we will be burning in hell by the end of the century. Skeptics assert that fear has been misplaced. This paper, prepared with thorough review of secondary sources via Web science, Scopus and Google scholar, aims to highlight the global climatic political debate that influences the climate change deal and recommends policies for the same.
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