bluuebunny/crossref_metadata_2025_split huggingface dataset:
Noise in the Mining Work Environment - Causes, Effects and Threats
Authors: Mocek Piotr 
Published: December 2020

Abstract
According to the reports, the European Agency for Safety and Health at Work, millions of employees in Europe are exposed daily to industrial noise and all risks associated with it. About 7% of employees suffer from a hearing problem and noise-induced hearing damage is the most common occupational disease in Europe because it accounts for about one-third of all work-related diseases and is more common than skin and respiratory diseases. The industries with the highest noise emissions in the work environment include heavy industry, mining and construction, although the noise is also increasingly appearing in other sectors of the economy. The research issues discussed in the article introduce the issue of noise in the mining work environment of Polish hard coal mines and identify its causes, effects and threats. The article presents the results of hearing screening tests conducted in 2019 using the Mobile Hearing Diagnosis Center among over 3,000 employees of 37 hard coal mines located in the Slaskie and Malopolskie voivodships and describes the effects of exposure to noise among employees. The article also identifies noise sources and presents the level of their emissions in connection with the operation of machinery and equipment used in Polish hard coal mining. The obtained results of the measurement of the sound intensity of mining machines and devices point to repeatedly exceeding the permissible hygienic standards of Polish and European noise emission. The results of the research presented in the article indicate the urgent need to take action to constantly control the noise level at the workplace and introduce solutions that will enable its reduction and allow better protection of employees against its disastrous consequences. The article is an interesting case study of research conducted in a natural industrial environment that allows you to start a broad discussion on harmful factors in the work environment and look for solutions that increase the level of employee safety during work.
Panchina Calcarenite: A Building Material from Tuscany Coast
Authors: Aquino Andrea , Pagnotta Stefano , Polese Simone , Tamponi Marco , Lezzerini Marco 
Published: December 2020

Abstract
The “Panchina” calcarenite widely outcrops along the Tuscan coastline from Livorno to Baratti (western Tuscany). It is a stone, highly porous with medium sized grains rich in organogenic carbonate fragments, mainly consisting in shells of bivalves, gastropods, and echinoderms visible to the naked eye or by using a lens. In the framework of the ongoing research on the building stones and mortars used throughout the Middle Ages in and surrounding the Pisa’s city (western Tuscany), this study focuses on the determination of the main physical and mechanical properties of “Panchina” stone samples from Livorno coast (Tuscany, Italy). The “Panchina” stone is no longer quarried and data is collected from unweathered rocks sampled from currently accessible outcrops. The data collected on twenty-eight samples from six outcrops of the Tuscan coast showed that the analysed specimens are made up of abundant calcite, subordinate quartz and feldspars, and traces of phyllosilicates. The analysed samples are characterized by medium-high porosity, highly variable water absorption by both capillarity and total immersion at atmospheric pressure, low uniaxial compressive resistance. Thanks to the good physical and mechanical properties that characterize the stone, the “Panchina” calcarenite is easy to work and extensively used in the necropolis of the Gulf of Baratti since Etruscan times and, in medieval times, in various public and religious buildings in the city of Pisa.
Automatic control of roadheader cutting head speed and load torque
Authors: Heyduk Adam , Joostberens Jaroslaw 
Published: December 2020

Abstract
Roadheaders are nowadays using both in mining engineering and in civil engineering (tunnelling). They often operate in hard rocks, so it is very important to optimize their performance by the full use of their power in different operating conditions. The coal seams are opened deeper and due to rock compactness and their uniaxial stress compression there increases serious problems with power demand and machine wear. The angular speed of cutting head should be adjusted to the rock hardness (the harder is the rock, the lower should be the speed) Nowadays, most of the produced roadheaders have constant speed driven cutting heads. In these cases, sometimes the rock cutting process is performed in conditions far from optimum. The paper presents a concept of the cutting head speed control system and selected results of research performed on laboratory stand equipped with a special R-130 roadheader with an inverter-fed cutting head drive. The closed-loop speed control is accomplished with a PI-controller. Optimum settings of this controller have been calculated using the model in the loop simulation and ITAE (Integral of Time multiplied by an Absolute value of Error) criterion. This criterion is widely used in electric drive technology. The application of the ITAE criterion for the selection of PI controller parameters usually provides a short settling time and an acceptable overshoot value. Results of the experiment show that the system is capable to maintain demanded speed and to follow commands from the master load controller. The drive operation parameters (motor power utilization and frequency of momentary overloads) are much better with automatic control of inverter frequency than with constant frequency drive operation. It should result in lowering power consumption and knife wear intensity.
Soil Remediation Strategies based on Risk Assessment Approach
Authors: Madear Camelia , Dunca Emilia-Cornelia , Madear Gelu 
Published: December 2020

Abstract
Anthropic activities are characterised by benefits and drawbacks for the human being and the environment. In the last few centuries of the humankind, the industrial activity has increased exponentially due to massive industrialisation process. This evolution has augmented the use of land for industrial purposes, which in turn affected the quality of soil by polluting it with high levels of chemical contaminants. On the other hand, intensive agricultural activities involve the use of pesticides and fertilisers, which at the end of the day, also contribute to the contamination of the agricultural land. Soil may be contaminated as well by accidents which occur due to human activity. The land quality is essential to preserve the environment, and it is required to maintain the level of pollution within legal limits. If contaminant levels are above the legal limits, then a soil remediation action plan should take place. Very high costs are usually associated with soil remediation, and the best strategies should be adopted to optimise resources and costs. A methodology to derive remedial targets has been successfully used in the USA and adopted and adapted in various countries inclusive in the EU. Currently, Romania has started to follow specific steps to align with international practices regarding the management of contaminated land. Although this methodology is extensively used in western countries, its application in Romania is in its inception phase. Therefore, this paper intends to present the current situation in Romania regarding the contaminated sites and potentially contaminated sites, the risk assessment approach that should be followed and the related soil remediation strategies that could be implemented.
Experimental Study of the Shock Wave Attenuation in the Water Mist with Air Gaps
Authors: Mataradze Edgar , Chikhradze Mikheil , Tavlalashvili Karlo , Akhvlediani Irakli , Bochorishvili Nika , Tatishvili Dimitri , Malvenishvili Zurab 
Published: December 2020

Abstract
The paper aims to propose ways for enhancing the effect of attenuating shock waves in the water mist. The fulfillment of this task can significantly contribute to the perfection of technologies for protecting from accidental explosions and the design of protective facilities. A series of experiments were carried out to investigate the influence of air gaps on shock wave attenuation in the water mist. A shock tube with hydraulic equipment capable of producing a 3-meter long dispersed water barrier with droplets ranging from 25 to 400 microns and total flow rate 14.5 l/s within a tube was used during testing. The paper analyzes shock wave attenuation within a tube in the water mist with and without air gaps. It has been established that in conditions when a 3-meter long water mist contains four air gaps, every 20 centimeters in width, overpressure reduction coefficient is 1.10-1.15 times higher than the one in the water mist without air gaps.
Magnetometric and electrometric investigations in the Beroe submerged archaeologic site
Authors: Sorin Anghel 
Published: December 2020

Abstract
In ancient times, Dobrogea was known as Schythia Minor or Mikra Skythia. In the Ist century BC, the respective territory was under the influence of the Pontic kingdom of Mithridate the VIth Eupator. From 28 BC it was integrated in the Roman province of Moesia Inferior by Emperor Augustus. Most Roman-Byzantine fortresses have been established by the Romans on the site of former Getic settlements: Tropaeum Traiani, Capidava, Carsium, Beroe, Troesmis, Arrubium, Dinogetia, Noviodunum, Ibida, Durostorum. The Roman-Byzantine fortress of Beroe-Ostrov grew around the Roman castrum of Beroe, where the Vth Legion was stationed in the Ist and IInd centuries. One can find here the partially unearthed ruins of a Roman and Byzantine fortress, dating back to the Ist-VIth and Xth-XIIth centuries, and nearby, those of a Paleo- Christian basilica, dating back to the Vth-VIth centuries. The latter is situated aside from the former cemetery, which has been used between the Ist -XIIth centuries. As a result of conflicts between the Dacians of Dobrogea (the Comati) and the Romans, the fortress was destroyed, and was re-inhabited once the Byzantines returned to the Lower Danube, under Emperor Ioan Tzimiskes. The Roman and Byzantine fortress from Beroe is located 3 km to the South of Ostrov village, in North Dobroudja, the north side of Moesia Inferior province. We carried out magnetometric and electrometric measurements in the Beroe archaeological site, located in the Dobrogea region of Romania. We analyzed the results to see if we could find the orientation of the walls or any other evidence of a former human presence within a limited area submerged beneath the Danube River. We showed the estimated depth of the site and the possible orientation of a wall. The geophysical data was acquired on the water (Danube River) within the submerged zone using marine equipment designed for that purpose (G822 device with cesium) with a gradient array and AGI ministing electrometer with 100 m length. The area of investigation was 100 by 50 meters, and it was located in the NE part of the site, having a grid density of 10 by 10 meters. The data we obtained in this study indicates the possible presence of submerged artefacts. Magnetic susceptibility measurements indicate a possible magnetic contrast between the regional geological background (local limestone rocks used in the construction of the fortress walls, mortar, etc.), characterized by low, sometimes even diamagnetic magnetic properties and artifacts such as bricks, backed (fired) adobe, ceramic fragments, showing relatively high magnetic susceptibilities.
Obtaining nanoscale CoSiO/Si/CoSi2 systems for increasing the range of light ray absorption energy
Authors: Donaev S B , Umirzakov B E , Sobirova D U , Azimov T D , Alimova D K 
Published: December 2020

Abstract
The morphology, composition and electronic properties of the CoSiO film obtained on the CoSi2/Si (111) surface by implantation of O2
+ ions in combination with annealing were studied. Parameters of energy zones are determined and information about the density of the state of electrons of the valence zone and conductivity zone is obtained. In particular, it is shown that the band gap width of this film is ~2.4 eV. It was ascertained that the CoSiO/Si/CoSi2 heterosystem is very promising for creating efficient solar energy devices.
The use of renewable energy sources in integrated energy supply systems for agriculture
Authors: Kodirov D , Muratov Kh , Tursunov O , Ugwu E I , Durmanov A 
Published: December 2020

Abstract
In many sectors of the industry, for example in agriculture, many countries find alternative sources of energy as an acceptable and feasible choice, given the high energy requirements on the one hand and the negative environmental effect of fossil fuels, on the other. Sustainable agriculture is a delicate equilibrium to increase crop production and preserve economic stability while reducing the use of scarce natural resources and the negative effects of the environment. The use of renewable energy systems for sustainable agriculture, therefore, needs to be promoted. This paper is a state of art on the numerous update and feasible technologies of renewable energy applications in the agricultural sectors. It also discusses the significance of renewable energy as environmentally clean technologies and the most reliable energy source. This study covers different types of renewable energy sources like solar systems, biomass energy, and hydropower. Such forms of renewables have been proven to be suitable options in agriculture, and in particular for remote rural areas.
Application of fiber-optic measuring current transformer in control and relay protection systems of belt conveyor drives
Authors: Adilov Y T , Khabibullaev M M 
Published: December 2020

Abstract
Until recently, control and protection systems used electromagnetic current transformers as information sensors. Due to the nonlinearity of the magnetization curve of the magnetic circuit, such current transformers cannot fundamentally provide satisfactory metrological characteristics in transient conditions, as well as after passing short-circuit currents when the magnetic circuit of the current transformer is deeply saturated with the aperiodic component of the short-circuit current. This is the main disadvantage of electromagnetic current transformers, which complicates and makes unreliable operation of control systems and protection of asynchronous conveyor motors. The article suggests the use of optoelectronic current transformers as information sensors for control and protection systems of Induction Motor.
Mathematical description of water flow quantity for microhydroelectric station
Authors: Kodirov D , Tursunov O , Khushiev S , Bozarov O , Tashkhodjaeva G , Mirzaev S 
Published: December 2020

Abstract
The main methods of regulating water flow and power of a microhydroelectric power plant are considered. New technical solutions are proposed for screw jet hydraulic turbines adapted to low heads and water flow rates. Preliminary calculations carried out by the authors show that the power of a micro-hydroelectric power plant depends on the individual factors of the area.As the speed of the water flow increases, the speed of the water wheel also increases, and in turn, the electric power of the micro-hydroelectric power plant is increased.
Application of hydro energy in small power supply systems
Authors: Kodirov D , Tursunov O , Karimova Kh , Akramova N , Parpieva S , Shafkarov B 
Published: December 2020

Abstract
This paper provides an opportunity to increase the efficiency of use in low-pressure watercourse systems by determining the dimensions and design of the micro-hydroelectric power plant operating on low-pressure watercourses. It was found that the size of a micro-hydro water turbine depends on the flow rate of the water, the volume of water hitting the blade at a fixed time, and the depth of the water surface. As a result, a technological scheme of a micro-hydroelectric power plant operating on low-pressure water streams was developed.
Electric pulse treatment of trees as an environmentally friendly mechanism for protection of orchards
Authors: Bozorov E 
Published: December 2020

Abstract
This article explains the main diseases of horticultural trees and almonds, which are grown in mountainous and hilly areas. At present, the protection of the environment, especially land and water resources from the effects of various chemical toxins are one of the main problems of world civilization. During the global financial and economic crisis, our country is currently using high-quality land resources, introducing advanced scientific and technical agricultural technologies and growing low-quality crops. Some of the important problems are management and control of land use, improvement of land relations and efficient use of public lands in general. For the cultivation of almond fruit products should use the method of electric pulse processing. Diseases of nematodes attach and settle on the root system of almonds. In the roots of the almond tree, nematodes form swells and bumps, feeding the young seedlings with mineral nutrients and eventually destroying the seedlings. We propose an electric pulse treatment method against nematode diseases of almond roots and obtain the results of electrotechnical experiments. To get the results of this experiment faster, we can clearly see the results of the experiment in the scientific laboratory of the Institute of Plant Protection in the data obtained using an electron microscope when processing the root stems of almond trees infested with nematodes. The use of an electrical impulse device in the cultivation of almond trees and in the fight against nematode diseases arising from its roots has been considered and the results of preliminary studies have been presented.
Substantiation of a method for increasing the efficiency of the electrosynthesis of ozone by using periodic voltage pulses
Authors: Muzafarov Sh M , Tursunov O , Kodirov D , Balitskiy V E , Babaev A G , Kilichov O G , Abdukadirova M N , Tasheva U T 
Published: December 2020

Abstract
The article analyzes the main directionsresearch to improve process efficiencyozone electro synthesis: research to improvestructures and materials of ozone generators; research influence of form, frequency, type of voltage. The article analyzed the process of ozone electro synthesis during nutrition sinusoidal voltage and identified significant disadvantages of this method. Process analyzed electrosynthesis of ozone when fed by periodic pulse stress with a drainage capacity of more than 5 and a significantincrease in efficiency this method.
Vibrations of a viscoelastic dam–plate of a hydro-technical structure under seismic load
Authors: Tukhtaboev A A , Turaev F , Khudayarov B A , Esanov E , Ruzmetov K 
Published: December 2020

Abstract
One of the characteristic features of the development of the hereditary theory is the wide possibilities for describing the dynamic processes of deformation of various materials. However, due to the lack of an adequate mathematical apparatus, the implementation of these possibilities is in many cases difficult, especially when studying nonlinear dynamic processes. In recent years, the power of computing has increased interest in nonlinear problems. Under these conditions, it is important to create and develop such effective methods of solution that could be applied to the widest possible class of problems. In this work, a mathematical model of the problem of the dynamics of thin-walled structures is constructed taking into account the hereditary properties of the material. Using the Bubnov-Galerkin method under various boundary conditions, the problem under consideration is reduced to solving systems of integro-differential equations. The analysis of the influence of various properties of the construction material on the amplitude-frequency characteristics is carried out.
Study of submountain river flow patterns constrained by a combined dam
Authors: Khalimbetov A , Bakiev M , Shukurova S , Choriev J , Khayitov Kh 
Published: December 2020

Abstract
Great attention around the world is paid to the design and construction of riverbank protection and channel control structures on submountain section of rivers. High slopes (i=0,001÷0,004 and higher), flow kinetics and ability to transport large amount of sediments are the features of submountain section of rivers.
Most of the research in this sphere has been conducted on the study of patterns of flow constrained by transverse structures in valley parts of rivers.
The main goal of this work is to establish the physical picture of flow around a combined dam in submountian river, the through-flow part of which is made of tetrahedrons, as well as to develop a design method for flow velocity field. Formations of two regimes have been established experimentally, i.e. “calm” at ia<icr and “critical” at ia≥icr. These regimes are mainly affected by flow contraction degree na, and Froude number Fr.
The presence of the following zones was established: core, intensive turbulent mixing and backflow zones, as well as the affinity of velocity fields in the zone of mixing by Shlihting-Abramovich. Prandtl has realized the task for “calm” regime with the use of integral relationship expressing law of conservation of momentum in the flow, equation for conservation of discharge and differential equation for nonuniform motion of transit flow with the account of tangential turbulent stresses on lateral surfaces. As opposed to the existing solutions, we accounted for the presence of two regions of spreading with different slopes of water surface, horizontal component of fluid weight, nonuniform distribution of velocities in head section, high roughness and the case when sections of target and vertical contraction do not match. Satisfactory results were obtained by comparing theoretical solution and experimental data.
Control of electric locomotives with asynchronous electric motors under asymmetric operating conditions in Uzbekistan
Authors: Tuychieva M. 
Published: December 2020

Abstract
The control of energy conversion processes in an alternating current electric traction drive with asynchronous (induction) motors under asymmetric operating conditions are considered in the paper and the ways to improve their efficiency are proposed. It was stated that asymmetric modes create asymmetry of currents in the AM phases, which negatively affects both the electrical and mechanical parts of electric traction drives. The analysis of electromagnetic processes in the complex asymmetry of currents and voltage in the circuits of electric traction drives allows creating an adaptive algorithm for electric locomotives control which allows increasing electric power indices and the system reliability.
Experimental study on a traditional house in Sabah, Malaysia using shake table
Authors: Ng R E Y , Lau T L 
Published: December 2020

Abstract
Due to destructive earthquake seldom happen in Malaysia, Malaysian have lack of awareness and knowledge towards earthquake disaster. Hence, most of the buildings constructed in Malaysia do not consider lateral loads in the building design. This includes traditional houses in Lahad Datu that located in Sabah state of East Malaysia where moderate earthquakes had occurred in past decades. These houses may be vulnerable towards earthquake due to lack of appropriate lateral resisting system in place. In this paper, the seismic hazard in Sabah is first reviewed. It is followed by an experimental study on a 1/4 scale model of a traditional house. The building is a hybrid structure with the combination of timber main frame and small portion of concrete beam and slab which is a common construction in local community. The model was constructed and tested on uni-directional shake table using the ground motion recorded at KKM seismic station and scaled to 80gal. Seven Linear Variable Differential Transducers (LVDTs) and nine accelerometers were installed to record displacements and accelerations of the model, respectively. The displacements and accelerations at various parts of the model were analyzed and discussed.