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排序方式: 共有342条查询结果,搜索用时 156 毫秒
1.
Stepan Kudria Iryna Ivanchenko Borys Tuchynskyi Kateryna Petrenko Oleksii Karmazin Oleksandr Riepkin 《International Journal of Hydrogen Energy》2021,46(1):157-168
The paper provides an assessment of the current wind energy potential in Ukraine, and discusses developmental prospects for wind-hydrogen power generation in the country. Hydrogen utilization is a highly promising option for Ukraine's energy system, environment, and business. In Ukraine, an optimal way towards clean zero-carbon energy production is through the development of the wind-hydrogen sector. In order to make it possible, the energy potential of industrial hydrogen production and use has to be studied thoroughly.Ukraine possesses huge resources for wind energy supply. At the beginning of 2020, the total installed capacity of Ukrainian wind farms was 1.17 GW. Wind power generation in Ukraine has significant advantages in comparison to the use of traditional sources such as thermal and nuclear energy.In this work, an assessment of the wind resource potential in Ukraine is made via the geographical approach suggested by the authors, and according to the «Methodical guidelines for the assessment of average annual power generation by a wind turbine based on the long-term wind speed observation data». The paper analyses the long-term dynamics of average annual wind speed at 40 Ukrainian weather stations that provide valid data. The parameter for the vertical wind profile model is calculated based on the data reanalysis for 10 m and 50 m altitudes. The capacity factor (CF) for modern wind turbine generators is determined. The CF spatial distribution for an average 3 MW wind turbine and the power generation potential for the wind power plants across the territory of Ukraine are mapped.Based on the wind energy potential assessment, the equivalent possible production of water electrolysis-derived green hydrogen is estimated. The potential average annual production of green hydrogen across the territory of Ukraine is mapped.It is concluded that Ukraine can potentially establish wind power plants with a total capacity of 688 GW on its territory. The average annual electricity production of this system is supposed to reach up to 2174 bln kWh. Thus, it can provide an average annual production of 483 billion Nm3 (43 million tons) of green hydrogen by electrolysis. The social efficiency of investments in wind-hydrogen electricity is presented. 相似文献
2.
I. V. Alekseev E. A. Goremychkin N. A. Gundorin A. V. Petrenko I. L. Sashin 《Semiconductors》2017,51(6):740-744
The possibility of increasing the sensitivity of a neutron detector based on a TlInSe2 crystal by introducing the 6Li isotope into this crystal is investigated. Introduction of the isotope is conducted by the method of electrochemical intercalation from aqueous and nonaqueous solutions of LiCl and also from the melt of the LiCl–KCl eutectic. It is shown that intercalation by the electrochemical method from a LiCl solution in propylene carbonate, performed along the “c” axis of the crystal (along strong bond chains) is efficient. The attained concentration of introduced lithium amounts to (1–1.2) × 1021 cm–3, which increased the sensitivity of the detector by approximately four times. Good agreement between the calculated and experimental values of the detector sensitivity is demonstrated. 相似文献
3.
A stress-assisted chemical reaction front propagation in a linear elastic solid is considered. The reaction between gas and solid constituents is sustained by the diffusion of the gas through the transformed material. The consideration is based on the kinetic equation in a form of the dependence of the reaction front velocity on the normal component of the chemical affinity tensor that in turn depends on stresses and gas concentration. Spherically symmetric problems of mechanochemistry are solved for the reaction front propagation in a sphere, in a body with a spherical hole and in an inclusion placed into an infinite medium. It is demonstrated how stresses can enhance, retard and even lock the reaction. The effects of the sign and value of the reaction front curvature are also examined. 相似文献
4.
Study of the impact of a new hurdle technology composed of electro‐activated solution and low heat treatment on the canned pea and corn quality and microbial safety 下载免费PDF全文
Viacheslav Liato Steve Labrie Marzouk Benali Mohammed Aïder 《International Journal of Food Science & Technology》2016,51(1):180-193
The objective of this work was to evaluate the quality of sterilised canned pea and corn in electro‐activated brine solutions at moderate temperatures. The lowest change in vitamin C was associated with the lowest heat treatment, while the short treatment time resulted in significant changes in texture and colour of vegetables. Best texture profile was obtained with the acid electro‐activated brine solution for pea and corn. The neutral electro‐activated brine solution resulted in a less firm texture for pea and corn. The green colour and brightness of canned pea were higher when neutral solution was used (a* = ?8.4 ± 0.3) than for the acidic one (a* = ?3.7 ± 0.6). The yellowness of corn was better with the neutral electro‐activated brine solution (b* = 36.32 ± 1.24) than with the acidic one (b* = 28.44 ± 2.39). Thirty‐three percent decrease of energy consumption was obtained using the electro‐activation technology. 相似文献
5.
J. B. Richardson C. L. Petrenko A. J. Friedland 《Nutrient Cycling in Agroecosystems》2017,109(2):161-179
Determining effects of clear-cutting on base cations and micronutrients is essential for ensuring the sustainability of forestry for biofuels and wood products. The objective of this study was to quantify long-term changes in forest floor and mineral soil base cations (Ca, Mg, and K) and micronutrient (Mn, Zn, and Cu) concentrations and pools following clear-cutting in forests aged 1–120 years. We studied forest soils along three clear-cut chronosequences located in the Adirondack Ecological Center in Newcomb, NY, Bartlett Experimental Forest in Bartlett, NH, and Harvard Forest in Petersham, MA. We utilized a strong-acid extraction to quantify base cations and micronutrient concentrations and pools, which may better assess nutrients over the chronosequences than the conventional exchangeable extraction. Generalized linear mixed-effect models (GLMMs) show forest floor and mineral soil Ca, Mg, Mn, and Cu concentrations and pools decreased with increasing forest age across the three study areas. Potassium and Zn concentrations and pools were not significantly different with stand age and neither did soil C and N pools and pH using GLMMs. We calculated that 32–67% of the Ca pool decrease can be attributed to uptake by regenerating vegetation but only 0.02–9% of Mg, Mn, and Cu after harvest. Thus, leaching was likely to the dominant loss process for Mg, Mn, and Cu following clear-cutting. Our results suggest nutrient pools decreased for over a century following clear-cutting, but it is unclear if this will impact plant growth. 相似文献
6.
S. A. Silkin E. A. Pasinkovskii V. I. Petrenko A. I. Dikusar 《Surface Engineering and Applied Electrochemistry》2012,48(1):1-10
The anodic dissolution of the nitrated layer of steel 45 specimens at small depths after the chemical thermal treatment is
studied. Investigations of the anode dissolution in 2 M NaCl were carried out using a rotating disk electrode with a partially
isolated surface. The correlation between the macrokinetics of the anode processes and the technological parameters such as
the roughness and microhardness of the nitrided steel surface is registered. The values of the minimal surface roughness and
the maximal microhardness are shown to be almost equal to those of the initial surface prior to the treatment and be reached
under high current densities (∼50 A/cm2) and intense hydrodynamic modes of treatment, i.e., in a state of thermokinetic instability (upon the constant formation
and destruction of surface layers induced by the critical temperature drop and a “thermal explosion”), which arises upon an
excess of the anodic limiting current. 相似文献
7.
In this paper an innovative micro-trigeneration system composed of a cogeneration system and a cascade refrigeration cycle is proposed. The cogeneration system is a combined heat and power system for electricity generation and heat production. The cascade refrigeration cycle is the combination of a CO2 mechanical compression refrigerating machine (MCRM), powered by generated electricity, and an ejector cooling machine (ECM), driven by waste heat and using refrigerant R600. Effect of the cycle operating conditions on ejector and ejector cycle performances is studied. Optimal geometry of the ejector and performance characteristics of ECM are determined at wide range of the operating conditions. The paper also describes a theoretical analysis of the CO2 sub-critical cycle and shows the effect of the MCRM evaporating temperature on the cascade system performance. The obtained data provide necessary information to design a small-scale cascade system with cooling capacity of 10 kW for application in micro-trigeneration systems. 相似文献
8.
Kalmykov S. G. Miroshnikov I. V. Petrenko M. V. Sasin M. E. 《Technical Physics Letters》2011,37(3):274-277
A study of space-time evolution of the laser spark induced with the Nd: YAG laser in stationary gases at low pressures has
been realized with the aid of high-speed photography. A mechanism to explain light propagation along the beam is proposed.
Calculated data are in a good agreement with the experimental ones. The article was translated by the authors. 相似文献
9.
A. V. Kushnarev Yu. P. Petrenko P. V. Ekkert M. N. Zhevlakov O. V. Travin N. M. Aleksandrova 《Steel in Translation》2010,40(7):690-693
The macrostructure of continuous-cast high-carbon steel (in particular, rail steel) billet may be improved by introducing
macrocooling additives to prevent overheating of the melt in the casting-machine mold. The liquidus temperature of the macrocooling
additives is 5–20°C lower than for the cast steel. Macrocooling strip is alloyed with boron, which ensures additional modification
of the rail steel. 相似文献
10.
V. I. Agafii V. A. Yurchenko V. I. Yurchenko V. M. Fomichev V. I. Petrenko A. I. Dikusar 《Surface Engineering and Applied Electrochemistry》2011,47(6):488-492
The effect of the anomalously high wear of the quenched steel counterbody was found during the testing of coatings manufactured
by electric spark plating (ESP) with an AlSn alloy (20 wt % Sn). The presence of SnO2 nanofibers in the coating composition, which are formed during the ESP with an electrode tool made of this alloy, is assumed
to be the main reason for the above effect. 相似文献