bluuebunny/crossref_metadata_2025_split huggingface dataset:
Geothermal Potential of Mining Water in the Bílina Mines
Authors: Davídková Veronika 
Published: December 2020

Abstract
This article is focused on utilization of geothermal potential of mining water in the Bílina Mines. The intention to explore geothermal potential in this area of interest based on consideration to use of this type of the Earth´s heat, such an alternative source of energy. Geothermal energy is cost effective, reliable and sustainable. Using of the geothermal energy leads to the production of green energy. Although geothermal energy has many advantages is not so much utilized. Geothermal energy is natural heat of the Earth, which is accessible from the surface. Economically recoverable only in places its accumulation in the anomalies. In terms of geothermal energy, the site, as part of Podkrušnohorské area, and these are to the most promising areas in the Czech Republic sections characterized by high heat flow. In article is presented research of geothermal energy at Bílina Mines, where the temperature of mining water and abundance of four hydro-geological boreholes were monitored in 2009-2010, 2011-2012 and 2018. Over 200 0000 m3 of water is dewatered from the Bílina Mines annually. These boreholes are used for water monitoring from the mine. Due to the large amount of water pumping is area of interest interesting for using geothermal energy. Results showed that although the geothermal potential of the mine water is not so significant, there will be great potential in low-temperature energy source use for heat pumps. Heat pumps are less expensive, they do not drill deep and their installation is easier. For our case study is recommended use water-to-water heat pumps.
Efficiency of Membrane Ultrafiltration in Water Treatment Plant Jasná
Authors: Barloková Danka , Ilavský Ján , Marton Michal , Slávik rej 
Published: December 2020

Abstract
Ultrafiltration (UF) is a membrane separation process by which the particles of mechanical nature are removed from the water. Thanks to the pore diameter that are the order of tenths nm and the material, constructional and chemical properties of UF membranes, this technology represents the final solution for a secured protection against the turbidity that is caused by content of non-soluble and colloid particles of organic and inorganic origin, bacteria and the majority of viruses. Ultrafiltration was investigated within the pilot-plant tests at the WTP Jasná during the treatment of surface water originating from the water source Zadná voda. Water treatment is in this locality focused on turbidity that is caused by storm rainfalls and snow thawing. Fully automated ultrafiltration equipment with the membrane modul UA-640 (Microdyn-Nadir) was used. On the base of filtration cycles, the effectiveness of membraned technology was evaluated. Water was supplied to the UF-device by the pump, so the UF-flow rate was invariably maintained at the 600 L/h Period of filtration cycle was 30 minutes. Following the end of the cycle, washing of membrane by using the back-flushing by water and air was applied. Filtered water accumulated in the tank was used for back-flushing while the air was supplied by the air-pump connected to the device. Any way of washing of the membrane did last for 30 seconds. On the base of filtration cycles, the effectiveness of membraned technology was evaluated. Turbidity removal is the major issue at the WTP Jasná. Limit for turbidity 5 NTU is set by Decree No. 247/2007 Col. Measuring data provided that the turbidity level of water treated by using the ultrafiltration device are compliant with the legal limit for drinking water. By using the ultrafiltration, the decrease by 76,1% has been reached in the first experiment (average turbidity in raw water 1,55 NTU). The efficiency of turbidity removal was 95,2% that was reached by ultrafiltration of water with a higher level of turbidity (average turbidity in raw water 8 NTU). High effectiveness of ultrafiltration was reached also with the water with the turbidity 37 NTU. In all of the three experiments, the turbidity of treated water ranged between 0,37 - 0,38 NTU.
Geochemical Features of Unburned Coal Particles in Fly Ashes from Thermal Power Plants in Bulgaria
Authors: Kostova Irena , Apostolova Denitsa , Stefanova Maya 
Published: December 2020

Abstract
Coal combustion in thermal power plants generates huge amounts of solid wastes, including fly ash (FA). The essays of its conversion into value-added products continuously increase. The aim of the study was: (i) to depict organic compounds (if any) present in industrial coal-derived FAs from four thermal power plants (TPPs) in Bulgaria; (ii) to assess the relationship of the compounds present with the feed coals using biomarker proxies; (iii) and, to appreciate biomarkers changes in distribution pattern caused by combustion. Average samples of FAs and samples from electrostatic precipitators of four TPPs feed by different rank coals were analyzed. The study was scheduled in comparison with parent feed coals. The yields of extractable organic matter (EOM) expressed in rel. % were low and comparable, ∼ 0.01%, but normalized to total organic carbon (TOC) depicted some differences. For lower rank coals FAs yields were higher, in the range 10-20 mg/g TOC, all dominated by polar components and an order of magnitude lower for higher rank coal FAs, < 2 mg/g TOC, with considerable portions of neutral compounds. After extensive fractionation of EOM from unburned coal particles in neutral fractions of FAs short chain n-alkanes (nC15-nC19) prevalence was distinguished. The feature was assigned to high temperature of combustion and thermal destruction of long-chain homologues (nC27-nC31). The distribution signatures for low rank coals kept some characteristics of parent coals while in the case of bituminous coal longer homologues were almost absent. The changes in n-alkanes distributions were rank depended and an attempt for explanation by FA particles porosity was done. For organic compounds registered in EOM of coal-derived FAs two provenances are supposed. The first group comes from the feed coals and the second one is formed in combustion processes or has changed distributions under the thermal treatment. Insofar as n-alkanes distribution signature was altered in combustion the origin should rather be assigned to the second group of components.
Different Approaches for Study Slope Stability in Quarries, Case Chouf Amar Limestone Quarry- M’sila, Algeria
Authors: Saadoun Abderrazak , Yilmaz Isik , Hafsaoui Abdallah , Hadji Riheb , Fredj Mohamed , Boukarm Riadh , Nakache Radouane 
Published: December 2020

Abstract
The Lafarge -M’sila group’s cement plant (Algeria) is supplied by the Chouf Amar limestone quarry, which allows great quarrying at the national level with annual productions of 4.2 mt / year, since several sliding in previous years have disrupted the exploitation and production of the quarry, and in the strategy of the Lafarge group increased its production up to 5mt / year in the medium term 2020-2030; a stability study is necessary to ensure production under the right conditions, the aim of our work is to study Chouf Amar stability and identify the important causes of the landslides that have influenced the site in question. We start with an empirical approach through a geomechanical characterization of the massif was put in place to highlight the instability at the level of the various rock formations. then, a stability analysis was carried out using two different approaches: the analytical approach using the limit equilibrium method (Slide 6) and the numerical approach using two methods: the finite element method (Phase 2 ) and the finite difference method (Flac) in the static and dynamic case considering the state of dry and wet marls. The results show an optimal state of stability on the scale of the full profile north flank of the quarry and bad stability on the scale of the bench’s of the different levels and the main facies of the potential slide is that of the marls.
Impact of Biochar on Soil Electrical Conductivity During 2 Year Field Experiment
Authors: Gliniak Maciej , Sikora Jakub , Sadowska Urszula , Klimek-Kopyra Agnieszka , Latawiec Agnieszka , Kuboń Maciej 
Published: December 2020

Abstract
The article presents the possibilities of using time-domain reflectometry (TDR) to determine the electrical conductivity of mineral soil with biochar addition. The field measurements were provided on test plots in 2 years experiment. The TDR method consists in measuring the time of electromagnetic pulse transmission and reflection from the obstacle back to the source point. The impulse is a step signal of voltage. The reflected signal contains information on the dielectric properties of the material being tested. Therefore, qualitative, and quantitative properties of the material can be detected. The tests were carried out using a mobile reflectometric device as an electronic humidity and conductive meter. Based on the obtained results, the usefulness of reflectometric methods in the study of the water content and electrical conductivity of mineral soil was determined.
Impact of Biochar on Soil Water Permeability Coefficient During 2 Year Field Experiment
Authors: Gliniak Maciej , Sikora Jakub , Sadowska Urszula , Klimek-Kopyra Agnieszka , Latawiec Agnieszka , Kuboń Maciej 
Published: December 2020

Abstract
Water is the most important substance which occurs in soils. As a soil solution it is a basis of life for plants, as well as a carrier of mineral salts collected by plants through roots. Ability to collect water by plants depends on the power of its binding with soil and thus on the quality of soil and amount of water. The objective of the article is to determine the water permeability coefficient in the superficial layer of soil in relation to the applied biochar dose. The research was provided in 2018 and 2019 year at agricultural field located in Krakow, Poland. The soil used for test was typical brown clay soil. The lowest value of water permeability was observed for soil where above 60 Mg·ha−1 of biochar was applied. Water permeability is strictly connected with general porosity and is often assumed as such in many papers. It was reported that the water permeability for control soil where no addition of biochar was used indicates up to two times lower permeability in comparison to the soil where biochar was added which indicates that biochar influences the amount of water available for plants which the investigated soils were able to store.
Comprehensive analysis of the change of pop solar power station output parameters in relation to ambient temperature
Authors: Turaev A , Muratov Kh , Tursunov O 
Published: December 2020

Abstract
This article examines a 128kW solar photovoltaic plant (SPP) connected to a 0.4kV distribution network in Pop district, Namangan region. The research revealed the effect of ambient temperature on the quality indicators of electricity generated by SPP. Ambient temperature affects not only the SPP production capacity, but also the inverter performance, which is the most basic device for SPP. The results were obtained on July 21-22, 2019 year when the air temperature was 350-450 C.
Liner motor drive of cattle farm feeders
Authors: Muhammadiev A , Yunusov R , Bayzakov T , Sattarov N , Yusupov Sh , Xaliqnazarov U , Sattarov M 
Published: December 2020

Abstract
This article discusses feed distribution control using a linear electric drive for small cattle farms. Electrification feeders are difficult complex units which in addition to the dispenser, they are equipped with working bodies that perform various technological functions. Given the above, we can conclude that this type of farm use a lot electro energy to low this effect we need use automation systems to electro mechanic units. In this article given results of experimental work in using of liner motor drives in cattle farms and mathematic explanation of electro safety according to proposed technology.
Substantiation of the optimal parameters by processing with electric contact methods to decrease the moisture content of technical seeds
Authors: Ibragimov M , Eshpulatov N , Matchanov O 
Published: December 2020

Abstract
To reduce moisture content of technical seeds in compliance with standard requirements, electric contact heating method is applied. The technical seed moisture content reduction process has been studied experimentally through electric contact processing. The mathematic model of the process has been defined. The optimal parameters of the process have been identified based on the mathematic model. To identify the optimal parameters of the technical seed moisture content reduction process the computer program, calculation algorithm has been developed by using computer program PascalABC.
Fault control of microgrid system: A case study of Karabuk University - Turkey
Authors: Yusupov Z , Almagrahi N , Tursunov O , Kodirov D , Almgarbj H A , Toshpulatov N 
Published: December 2020

Abstract
In this paper Karabuk University microgrid system is introduced and fault control of microgrid is analyzed. The microgrid system of Karabuk University campus consists of diesel generator, solar PV panels, energy storage unit, critical and non-critical loads. Simulation of microgrid in both grid-connected and isolated operation modes are conducted on MATLAB/Simulink. The fault control has been implemented in the microgrid system to effectively manage of power in the system. The system is effectively disconnecting the microgrid from main grid within a microsecond after fault conditions. The distributed energy sources have been supplying the energy to load based load profile settings. From the simulation results, the developed control mechanisms provide stable operation in the microgrid system.
Analysis of the influence of temperature on the operating mode of a photovoltaic solar station
Authors: Kurbonov Yu M , Saitov E B , Botirov B M 
Published: December 2020

Abstract
In this paper, the influence of overheating on the performance of photovoltaicmodules was evaluated. The experimental observation was carried out on the basis of a 20 kW photovoltaic station with 60 photovoltaic modules. It was found that an increase in the number of solar cells with overheating in the photovoltaic module leads to an increase in output power losses. The temperature of the Feb is one of the main factors that determine the electrical parameters of the Feb and its efficiency in General. An increase in the SE temperature leads to a decrease in the band gap, which gives a slight increase in the photocurrent due to the expansion of the photo-response spectrum into the long-wave region. However, this increase in photocurrent does not compensate for the decrease in Uoc and the filling factor of the load characteristic FF due to an exponential increase in the saturation current with increasing temperature, which leads to a significant decrease in efficiency with increasing temperature.The width of the band gap of semiconductors decreases with increasing temperature, and the absorption edge shifts to the region of lower energies.Continuous analysis of the presence of "hot spots" and replacement of defective modules during the initial period of operation can increase the output power and shelf life of the photovoltaic system.
Assessment of wind and hydropower potential of Bukhara region
Authors: Sadullaev N N , Safarov A B , Mamedov R A , Kodirov D 
Published: December 2020

Abstract
This article presents a methodology for assessing the gross, technical and economic potential in the territory of the Bukhara region. Locations with high wind and hydropower potential were identified in the region, and the introduction of wind and micro-hydroelectric power plants was analyzed. According to the results of the study, the importance of wind and hydropower in the development of the socio-economic sphere of remote areas of the Bukhara region was studied.
Review on Strengthening Reinforced Concrete Columns Using Reinforced Concrete Jackets
Authors: Zaiter A , Lau T L 
Published: December 2020

Abstract
This paper highlights the review of the effects of concrete surface treatment and loading on the structural behavior of reinforced concrete (RC) columns retrofitted with RC jackets. The concrete surface treatment aspect is assessed based on the surface roughness, use of dowel bars, use of shear connectors, and applying bonding agent between the column core and the jacket. However, the loading aspect is evaluated based on preloading history and the applied loading pattern. The latest researches and recommendations for concrete jacketing are presented. It is found that sand-blasting with the use of dowel bars or shear connectors helps the retrofitted column to behave monolithically. Preloading does not have a significant effect on the retrofitted column. However, it is recommended to apply the load on the full retrofitted cross-section.
Vibration creep of loess soils
Authors: Rasulov H Z , Rasulov R H , Tashxodjayev A U , Babajanov M B 
Published: December 2020

Abstract
Taking into account the rheological properties (creep) of clay soils when solving problems of soil mechanics is important, because many inaccuracies in forecasts related to soils arise from an under-accounting of these properties, which are characteristic of clay soils. The report deals with the issues of vibration creep of moisten loess soils, related to the precipitation of structures and the permissible load on the soil. The method of experimental research and the results of experiments on the dependence of the coefficient of soil vibration creep on the acceleration of vibrations are presented. The factors influencing the vibration creeping deformations of the forest, including the role of soil adhesion and the duration of shaking, are established. Research results are of great importance in the practice of constructing unique engineering structures in seismic areas.
Estimation of the subsurface structure in Georgetown, Penang Island using single point microtremor observation technique
Authors: Lee J Y , Lau T L 
Published: December 2020

Abstract
In this paper, the subsurface structure was estimated using single point microtremor observation technique in Penang Island, Malaysia. Malaysia is located out of Pacific Ring of Fire hence no active tectonic activity happens. However, numerous earthquakes that happened at neighbouring countries act contrary to the myth that Malaysia is seismic free. Tremors from far field earthquake events in Sumatra can be felt at Penang Island. The local site condition is investigated in this study in order to predict the damages on buildings when the earthquake strikes. The study area focused on Georgetown as it is the heart of Penang Island where the economy and population concentrated on. The objective of this study is to determine V

s,30
substructure of Georgetown area. Microtremor single point measurements were conducted to estimate the V

s
profile at Georgetown area. For estimating the ground structure, Rayleigh wave ellipticity method was adopted to single point measurements. From the results, it is found that Georgetown area has V

s,30
of 216.4 m/s to 286.6 m/s and the predominant frequency ranging from 1.7 Hz to 2.43 Hz. Hence, the ground type of Georgetown area is classified as Class C in accordance to Eurocode 8.
Bimoment theory construction to assess the stress state of thick orthotropic plates
Authors: Mirsaidov M , Usarov M 
Published: December 2020

Abstract
The paper is devoted to the development of a theory and method for calculating thick plates. A detailed analysis of well-known publications devoted to this problem is given. A theory and a method were developed to assess the stress-strain state of thick plates without simplifying hypotheses within the framework of three-dimensional theory of elasticity. When constructing a theory, all components of strains and stresses arising from the nonlinearity of the law of displacement distribution along the plate thickness were taken into account. The equations of motion of the plate were constructed with respect to forces, moments and bimoments. The solution method was based on exact expressions in trigonometric functions. The bending of isotropic and orthotropic plates was considered as a calculation example. The solution obtained showed the effectiveness and accuracy of the proposed bimoment theory in assessing the stress-strain state of thick plates.
Laser Biotechnology for Nutritional Health, Sustainable Environment and Development
Authors: Dobrowolski J W , Tursunov O , Pirimov O , Nazarova O J 
Published: December 2020

Abstract
The key factor for sustainable development is the integration of sensitive methods for early detection of environmental risk factors for nutritional health with efficient primary prevention against contamination of the food chains as well as deficiency of biologically active trace elements in the human diet. Proper algorithms of laser photostimulation are recommended both for more efficient biological treatment of wastewater and also for a proper amount of essential elements in cultivated plants supplemented by other modern biotechnology for multiplication e.g. vegetables. Laser biotechnology is also recommended for better reclamation followed by enhancement of biomass and bioenergy production in different regions of the world as a contribution to sustainable development and the creation of many green jobs. This eco-innovation supplemented with the complementary biotechnologies e.g. reclamation of semiarid areas, modern apiculture integrated with the cultivation of medical plants, cultivation of algae, aquaculture, energy plantations, reforestation and protection of biodiversity could contribute to better adaptation to climate change and situation connected with COVID-19 pandemic and risk of worsening human health, malnutrition, and hunger.
Modeling the movement of onion seeds after the seeding machine
Authors: Turdaliev K V , Lee A , Qosimov A , Makhkamov G , Komilov S , Pulatov J 
Published: December 2020

Abstract
One of the most important issues of sowing small-seeded crops (in the example of onions) is considered. The method of sowing has a great influence on crop yields. The choice of planting method is due to the need for a more uniform distribution of plants over the field area in order to optimize the conditions for their development. Studying the movement of seeds during the sowing process is the most important task, as the seeds are object of sowing. The article provides an analysis of previous work on the precision sowing of small seed crops. And also, the flight and the trajectory of the seeds from the ejection window to the bottom of the groove were studied theoretically. In the research, methods of higher mathematics, classical mechanics, and impact theory were used in which it was possible to obtain the necessary equation. Based on the numerical solution of the obtained equation, graphs are constructed that determine the trajectory of falling onion seeds when ejected from the sowing apparatus and the graphical dependence of the recovery coefficient on the height of the sowing apparatus. Also, the installation height of the metering unit was installed.