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Interaction of lava-like fuel-containing masses of Unit 4 at the Chernobyl NPP with structural concrete in the active phase of the accident of April 26, 1986, was studied. It was found that the fission fragments and the accumulated products contained in spent nuclear fuel penetrated the concrete from lava with different fractionation coefficients Kfr. The absolute values of Kfr were calculated, and this phenomenon was identified as a factor to be taken into account when estimating the total amount of radioactive waste for the Shelter.

Abstract Critical Infrastructure Protection is a relatively new scientific domain stemming from an American Presidential directive PDD-63 of May 1998. Critical Infrastructure (CI) performance and protection are national priorities for all European Union (EU) countries following the introduction of the EU Directive 2008/114/EC, which takes an all hazards approach. This paper has an international focus. At the global and European level, the interest in identifying the impacts of climate change on CIs and extreme weather events (EWE) has increased in the last decades, following several high-profile so-called natural disasters. Concern is evidenced by the UN Sendai Framework for Disaster Risk Reduction and the EU Commission’s Staff Working Document on Risk Assessment and Mapping; Guidelines for Disaster Management, SEC (2010) 1626. This paper presents and discusses scientific work which has been published in this area, with a focus on energy CI. The impacts of climate change and extreme weather events on energy CI are initially identified. Important aspects in CI protection such as risk assessment, interdependencies with other sectors, and adaptation/resilience options are subsequently presented and discussed.

Abstract Five different models for calculating solar module temperature, output power and efficiency for sunny days with different solar radiation intensities and ambient temperatures are assessed in this paper. Thereafter, modeled values are compared to the experimentally obtained values for the horizontal solar module in Nis, Serbia. The criterion for determining the best model was based on the statistical analysis and the agreement between the calculated and the experimental values. The calculated values of solar module temperature are in good agreement with the experimentally obtained ones, with some variations over and under the measured values. The best agreement between calculated and experimentally obtained values was for summer months with high solar radiation intensity. The nonlinear model for calculating the output power is much better than the linear model and at the same time predicts better the total electrical energy generated by the solar module during the day. The nonlinear model for calculating the solar module efficiency predicts the efficiency higher than the STC (Standard Test Conditions) value of solar module efficiency for all conditions, while the linear model predicts the solar module efficiency very well. This paper provides a simple and efficient guideline to estimate relevant parameters of a monocrystalline silicon solar module under the moderate-continental climate conditions.

Since early 1970s, the Black Sea pelagic ecosystem has been experienced severe impact caused by numer� ous anthropogenic factors, which have significantly changed its state [1–3]. Among the latter, eutrophica� tion was of great importance. It has altered the tropho� dynamics of the pelagic zone owing to an increase in the phytoplankton abundance and biomass and a sig� nificant change in its species composition. For exam� ple, the proportion of diatoms, which account for over 90% of the total phytoplankton abundance on the Black Sea shelf, has significantly reduced. As a result, dynoflagellates and small species, primarily coccoli� thophorids and small flagellates became dominants [4]. Such changes in the Black Sea pelagic zone affected both the entire structure of its food web, including the upper trophic layers of the ecosystem (primarily the stock of small pelagic fishes), and its state in general. On the one hand, the primary produc� tive base in the ecosystem has increased; on the other hand, qualitative changes in the primary producers of the trophic web resulted in a decrease in the ecological efficiency of utilization of matter and energy in the Black Sea ecosystem on the whole. This, in turn, has disturbed its resistance to adverse impacts [1, 5]. To clarify the relationship between the primary and ter� minal trophic components in the Black Sea pelagic

PurposeThe world society as a whole and Ukraine are realizing that climate change and decarbonization are critical issues. This study aims to determine whether the aviation and transportation industries in Ukraine have rearranged their priorities as a result of this investigation. The process of decarbonization and adaptation begins with a legislative point of view and then moves on to technology, improvements, infrastructure, energy and emissions stages to meet the primary goals.Design/methodology/approachAn analysis of the content of the literature about decarbonization and the legislation and application processes for airport de-carbonization in Ukraine. The study focuses on the landing and take-off cycle of the airports. The statistics on the transportation of the Ukrainian territory have been looked at over time to determine whether or not there have been any shifts.FindingsThere are significant reduction figures found in the Poltava region. Double-figure emissions reductions in four years of series are 5.9%, 41.0% and 19.3%, in the respective years of 2018, 2019 and 2020, which is a 55.3% reduction compared with 2020 to 2017.Practical implicationsBecause the transportation industry and aviation generate a significant amount of carbon dioxide, steps must be taken to cut emissions. The decarbonization process ought to proceed in the form of a series of actions to achieve carbon reduction goals with a broader range of participants. In addition, an aviation subsidy for biofuels may be required to initiate the shift by having the taxation change.Originality/valueAs far as the literature surveys, to the best of the authors’ knowledge, this is the first comprehensive Ukrainian decarbonization analysis that considers legislation, technology, improvements, infrastructure, energy and emissions in addition to just those four categories.

Protected areas are necessary for the conservation and enhancement of biodiversity. Wildfires are major threats to forests and other natural areas, because they may cause irreversible damages. The aim of this study was to analyze the perspective of experts (N = 284), from six countries of the Black Sea, on the current status and problems of protected areas and wildfires. Understanding their points of view could enhance future management on these issues in the region. Data collection was carried out for 9 months, using a web-based questionnaire. Wildfires were perceived as a serious problem in Turkey, Armenia and Greece but as a substantially less serious problem in Romania, Ukraine and Moldova. In Greece, Armenia, and especially Ukraine, the current designated protected areas are considered sufficient to maintain biodiversity, while in Romania, Turkey, and especially Moldova, more areas should be designated as protected. A major need in all countries (except for Turkey) is the increased use of information and communication technologies for both wildfire suppression and protected area management. Experts were divided on whether wildfire suppression and management of protected areas are interconnected. However, there is growing awareness of the adverse impacts of climate change in protected areas and the frequency of wildfires in the future. The most frequently suggested measures to alleviate these impacts were: changes in forest management and increasing public awareness for wildfire suppression, along with changes in forest management and increased staff training to enhance protected area conservation.

Abstract Adding 5 mass% wood pellets in a coal blend affects the reactivity with CO2 and microstructural properties of the coke at different final coking temperatures of 950 and 1100 °C. A correlation between coke reactivity index (CRI) and BET specific surface area was found. The reactivity of coke and biocoke decreases with a decrease in the specific surface area, as well as with an increase in the carbonization temperature. Raman spectroscopy results indicate that the higher carbonization temperature of biocoke mitigates the effect of 5 mass% of biomass addition. The X-ray diffraction-based interlayer spacing of carbon crystallite (d002) decreases slightly with increasing carbonization temperature, and crystallite height (Lc) increases with rising coking temperature for both coke and biocoke. Additionally, the lower the d002 value, the lower the CRI of the cokes and biocokes. A good correlation between CRI and d002 is observed. Carbon crystallite width (La) values increased with a rising carbonization temperature, indicating the intensive growth of carbon crystallites in all directions. However, these values for biocokes are lower due to the presence of charcoal particles.

Abstract Ukraine has an officially adopted target for energy from renewables of 25% by 2035. Renewable energy producers in Ukraine enjoy a feed-in tariff, valid until 2030. In Ukraine, a debate has begun on whether the feed-in tariff should be prolonged. This paper focuses on the projected cost of electricity from renewables, nuclear and fossil fuels in Ukraine in 2030, based on a levelized cost of energy (LCOE) approach. Results indicate that prolongation of the feed-in tariff is necessary for most types of energy generation from renewables. The existing rate of the CO2 emissions tax is too low to affect the LCOE of fossil fuel-based electricity. Coupled with the projected low price for coal and natural gas, this will make renewables less competitive in Ukraine in 2030 if there is no feed-in tariff.

The Ghana Nuclear Power Agenda is a program laid out by the Ghana Atomic Energy Commission in collaboration with the government of Ghana to guide and facilitate the installation of Ghana’s first ever nuclear power plant. The nuclear power plant is expected to generate between 1000 and 12,800 MW of electricity from its inception to the final installations in a span of 20 years. Ghana's Third National Communication (TNC) Report to the UNFCCC indicates 59 million metric tons of carbon dioxide (MtCO2e) emission in 2011. Between 1991 and 2011, greenhouse gas (GHG) emissions grew by 20% as energy intensity of the economy rose alongside with a growing demand in industry, transport and households. If nothing is done to curtail GHG emissions from its major sources such as transport and fossil-source energy in Ghana, the looming catastrophe of the changing climate will occur faster than we imagine. Nuclear power has been cited as environmentally friendly (zero-to-low carbon emission), efficient and sustainable source of energy that works down on CO2 emission. It offers current and future energy needs without burdening future generations with a broken environment. Using Crystal Ball simulation model, the current study estimates a cumulative increase (35%) in CO2 emission in a span of ten years without nuclear power in Ghana’s energy mix. With the inclusion of nuclear power in the country’s energy mix, the model estimates CO2 emission cut by 12.5% for the same period, and 18.2% in 20 years. Thus, given the same period of time, the rate of emission of CO2 was found to be more than twice its reduction.