bluuebunny/crossref_metadata_2025_split huggingface dataset:
Justification scheme installation of a rotary working body for opening grape bushes
Authors: Turakulov M , Ermatov V 
Published: July 2020

Abstract
The article describes the nature of the movement of a non-driven rotary working body when working in row aisle: portable with speed V

n
and relative (rotational) around the axis of rotation with angular velocity ω. The technological process of the operation of a non-driven rotary working body can be divided into three main interrelated points: the introduction of the dump into the soil, the descent of the soil from the surface of the dump, and the flight of soil particles discharged from the working body.
And also a diagram of the interaction of the blade of the working body with the soil. When a soil particle moves along the surface of the dump in the active working zone, where due to the soil cutter, the extreme point of the dump moves with acceleration, a force arises pushing the soil particles from the surface of the dump. Knowing the forces acting on the particle and the scheme of their action, it is possible to compose the differential equations of the soil on the surface of the dump. Formulas are given that determine the flight range of soil particles descending from the dump of a rotating working body. The length of the flight path of the soil particles after the descent of their working body is determined. The direction of soil displacement also depends on the inclination of the non-power rotary working body relative to the soil surface (horizon). When the rotational working body is tilted towards the row, the soil particles move to the middle of the aisle.
Pole-changing windings for turbomechanism engines
Authors: Rismuhamedov D , Tuychiev F , Rismuxamedov S 
Published: July 2020

Abstract
The article substantiates the relevance of the development of pole-changing windings for turbo-engins. There is a review of specialized literature on the development of pole-changing windings. Two-speed motors with a 4/3 pole number ratio have one pole-changing stator winding by the method of PAM. Based on the method of “Discretely specified spatial function” a pole-changing winding is obtained for a 3/4 pole ratio with 72 stator slots. The analysis of the electromagnetic properties of the obtained winding is carried out. The correspondence of the obtained winding for use in turbo-mechanisms is revealed. As a result of the study, there were procured the stator windings at 6 and 8 poles, which enabled to change the spin speed of the motor in the fan drives without breaking the drive power circuit by the scheme ΥΥΥ/ΥΥΥ with additional branches
Selection of the number of teeth of the sprockets of the soil seeder
Authors: Duskulov A , Isakov A , Jalilov Z 
Published: July 2020

Abstract
Presowing tillage allows you to lay a solid foundation for friendly and healthy seedlings, as well as a high crop of crops. For its implementation, a whole range of work is required to prepare the soil, which is carried out by plows, cultivators, harrows, and other agricultural machines and implements.
In the soil and climatic conditions of Uzbekistan, soil preparation for cotton sowing is carried out in the spring, on autumn plowing, while depending on the state of the field, differentiated fields are cultivated: partial planning, subsurface cultivation, chiseling, cultivation, harrowing with praying. At the same time, the composition of the soil prepared for sowing does not always meet the required quality of the structural-aggregate composition, the soil becomes coarse, and the top soil layer is very compacted. This situation prevents the high-quality implementation of the technological process of sowing cotton seeds of a cotton seeder.
One solution to this issue is the active loosening of the soil in the area of cotton seeds with simultaneous sowing on one unit.
Innovative technologies in the effective use of water resources
Authors: Sherov A , Urinboev S 
Published: July 2020

Abstract
Global warming in the arid region is currently exacerbating water scarcity. The use of groundwater for crop irrigation is one of the major problems in the world. In this context, the use of rivers and ponds with varying degrees of mineralization is especially important for the irrigation of crops. About 300 km3/year of collector-drainage water (CDW) is formed in the world, which causes great damage to the economy and nature of all countries of the world. In this regard, one of the important tasks is the development of measures for the reuse of collector-drainage water for irrigation, the first demineralization, and disinfection, or their use in combination with river water. To solve these problems, a neutron-active analysis of the composition of the soil and trace elements were studied, as well as the dynamics of the distribution of water in the active soil layer to determine the patterns of water absorption in active soil during irrigation based on a new innovative method of nuclear physics and irrigation of cotton plantations with the addition of drainage water and as a result of which, there was provided the efficiency of water use and increase the productivity.
Methods of managing the agricultural background of cotton and technical means for their implementation
Authors: Shaimardanov B , Isakov A , Mirnigmatov B 
Published: July 2020

Abstract
In the complex of measures aimed at reducing the laboriousness of cultivating and growing high yields of raw cotton, a major role is given to further improving the technology and means of mechanizing cotton sowing. In recent years, rainy weather has been observed during the period of sowing cotton, as a result of which the germination of cotton seeds is significantly delayed. When showers, puddles form on the traces of the seeder, which leads to rotting of the seeds, as a result of which repeated sowing is carried out. When cultivating cotton on the ridges, in accordance with the theoretical foundations of soil cultivation, a favorable composition of the arable layer is ensured for a long period of cotton growing. This contributes to friendly shoots, good plant development and a high yield of raw cotton with early ripening, moisture accumulation on the ridges eliminates soil pollination, destruction of the structure, and formation of soil crust. Using the drip irrigation system allows to provide plants with water and fertilizers, where necessary, at the right time and in the right amount.
Stabilization of mechanical systems with nonholonomic servoconstraints
Authors: Khusanov K 
Published: July 2020

Abstract
The proposed work is devoted to the study of mechanical systems with releasing nonholonomic servoconstraints on controllability and stabilization. In this case, the reaction forces of the servoconstraints are decomposed into the normal and tangent components. The factors of tangent components are taken as control parameters. A technique is proposed for determining the reaction forces of servoconstraints providing stabilization of motion relative to the variety determined by nonholonomic servoconstraints. As an example, the problem of a gyroscope in a cardan suspension with nonholonomic releasing servoconstraints is considered.
The results of the experimental nature of the vibrations of the grid cotton cleaner
Authors: Shodiyev Z , Shomurodov A , Rajabov O 
Published: July 2020

AbstractThe article provides a new effective scheme and principle of operation of a multifaceted grid of cotton cleaner from small trash. The results of comparative experimental studies of the grid oscillations and the nature of loading depending on the parameters and modes of cotton cleaning are presented. In the experiments performed, the nature of the vibrations was investigated by studying the component vibrations of two grids simultaneously to compare the results. An analysis of the obtained laws of grid vibrations showed that the amplitude of the recommended multifaceted mesh surface on the elastic supports exceeds the amplitude of vibrations of the existing grid 5–7 times and reaches up to (2 ÷ 2.5) × 10−3m. In this case, the oscillograms are presented for steady-state modes of the work of the cotton cleaner. The results show that an increase in the coefficient of the number of faces of the grid leads to a decrease in the load of the grid to (0.3 ÷ 0.5) N. The parameters of a multifaceted grid of cotton cleaner from small trash are substantiated. Experimental studies have studied the workload and the law of vibrational motion of the grid surface.
Descrease in noise and vibration of single-phase asynxronous motors in rolling stock
Authors: Gapparov A , Berdiyev U 
Published: July 2020

Abstract
The article describes the magnetic noise during the operation of a single-phase asynchronous motor due to the vibration of the stator package of the motor under the action of vibration-absorbing forces due to the interaction of harmonics of a magnetic field of various origins in the air gap of the machine. As a normalized parameter of vibration created by an electric machine, the effective value of the vibration velocity is adopted. Electric motors used in electric rolling stock operate in more difficult conditions in comparison with general industrial ones. In the electric rolling stock, various auxiliary electric machines are used. Despite the relatively low level of magnetic vibration of high frequency, due to its determining effect on the magnetic noise of single-phase motors, this component is of independent interest for research.
Research of the operating process of disc displaying machine of potato landing machine
Authors: Makhmudov Kh 
Published: July 2020

Abstract
The level of potato production in the developed countries of the world is characterized by the stability of yields reaching up to 45 and more tons per hectare. High potato production in developed foreign countries is achieved through a systematic approach at all stages and technological operations of cultivating and harvesting using advanced technologies and modern technical means.
At the same time, in our country, the gross harvest of potatoes from 78.8 thousand ha is 1.717 million tons, that is, the yield per hectare is 21.8 tons. This significant difference in potato yields between domestic and foreign producers is due to several reasons:
- in our country, about 90 % of potatoes are produced mainly on small-contour and scattered plots with an area of 0.2-1.5 hectares of dekhkans and farms. In such areas, the simplest technologies with a low level of mechanization are used;
- low level of provision of potato producers with high-quality seed materials, as well as low-quality planting calibration of tubers in size, which has a significant impact on the quality of work of potato planting machines;
- the lack of domestic potato planting machines differing in the quality of the uniform distribution of tubers during planting, since the quality of the machine depends on this factor;
To successfully solve these and other problems of increasing potato productivity, it is necessary to solve the accuracy of dosing potato tubers and their uniform distribution during planting.
Dynamic stability of thin-walled structure elements considering hereditary and inhomogeneous properties of the material
Authors: Turaev F , Khudayarov B , Kucharov O , Rakhmatullaev A , Zhuvonov K , Gulomov O 
Published: July 2020

Abstract
The paper is devoted to the study of nonlinear problems of the dynamics of thin-walled structures considering hereditary and inhomogeneous properties of the material. To describe the processes of strain in viscoelastic materials, the Boltzmann-Volterra integral model with weakly singular hereditary kernels was used. Using the Bubnov-Galerkin method, the problem under consideration was reduced to solving the systems of nonlinear integrodifferential equations considering hereditary and inhomogeneous properties of the material and the radius of curvature of the structure. A computational algorithm was developed based on the elimination of the features of integrodifferential equations with weakly singular kernels, followed by the use of quadrature formulas. The results of calculating a thin-walled structure with hereditary and inhomogeneous properties of the material streamlined by a gas flow are presented. Solutions are obtained in the form of graphs.
Non-stationary oscillations of high-rise axisymmetric structures
Authors: Khudainazarov Sh , Donayev B , Yarashov J 
Published: July 2020

Abstract
Dynamic behavior of a high-rise structure is investigated in the paper taking into account linear and nonlinear strain and energy dissipation caused by internal friction in the building material under various kinematic effects. An algorithm and program have been developed for the dynamic calculation of high-rise axisymmetric structures under various dynamic effects. Unsteady oscillations of the high-rise axisymmetric structure represented by a one-dimensional model - a viscoelastic beam of the annular cross-section with a variable tilt of the generatrix and a variable thickness are considered. Dynamic behavior of a high-rise structure in the resonant mode under short-term pulsed effect, under prolonged pulsed effect, under the sinusoidal-damped effect, under real seismic impact is studied and the graphs of displacement changes over time of various points of the structures are plotted. It was found that the dynamic response of a high-rise structure is affected not only by the magnitude of the dynamic load but also by its frequency spectrum and duration. Under the impact of a frequency close to the natural vibration frequency of the structure, significant displacements occur, and, if the material does not possess dissipative properties, the structure could collapse, being in the resonant mode.
Possible methods analysis and optimization of the landslide slope stabilization in the reconstruction area of the escalator gallery on the Moscow River shore
Authors: Chunyuk D , Selviyan S , Selviyan A 
Published: July 2020

Abstract
This work solves the current task of construction on the landslide slope of the escalator gallery. The purpose of this work is to analyze and optimize various methods of stabilization of the soil mass and to identify the optimal solution for its strengthening. As a result of the calculations carried out, the most suitable option for strengthening the slope was found, which simultaneously had low material consumption and provided sufficient stability of the slope.
To numerical approach for calculation of underground structures
Authors: Miralimov M , Adilov F , Abirov R , Juraev D , Khazratkulov I 
Published: July 2020

Abstract
The new approach for numerical calculating of stress and strain state of underground structures is presented in this issue. The advantage of this method is using in design scheme a real diagram of concrete and reinforcement materials. Also, these calculations are allowed to trace the process of deformation of reinforced concrete in each of the sections of the structure. In the technique, static calculations of reinforced structural elements when changing their initial conditions or stress state after strengthening are carried out taking into account new data. A three-dimensional finite element calculation is also carried out while taking into account regulatory loads. Assessment of levels of tangential and tensile stresses in walls makes it possible to target reinforcement and parameters of monolithic stiffness belts. Numerical results for discussion are presented in this paper.
Barriers of Low Permeability to Water – Technical Solutions
Authors: Polańska B , Rybak J 
Published: July 2020

Abstract
The need of creating the barrier for inflow, access, flow-through, efflux, outflow, or lastly the effect of ground waters and dissolved solids results from as numerous (or surely more numerous) necessities as the number of “flows” specified above. Anti-filtration barriers can be grouped in many ways depending on the fundamental purpose required in hydraulic engineering and geoengineering. The study presents various aspects of creating waterproof barriers in the ground in the short and long term, discusses the most commonly used technological solutions, and finally provides examples of such actions and warns about possible consequences.
Classification of Brain Functional Connectivity using Convolutional Neural Networks
Authors: Shahriman W N S , Phang C R , Numan F , Ting C M 
Published: July 2020

Abstract
Abnormalities and alterations in brain connectivity networks as measured using neuroimaging data has been increasingly used as biomarkers for various neuropsychiatric disorders. Schizophrenia (SCZ) is a complex neuropsychiatric disorder associated with dysconnectivity in brain networks. In this paper, we develop a framework for automatic classification of healthy control and SCZ patient based on electroencephalogram (EEG) connectivity and compare the classification performance with conventional artificial neural network (ANN). We propose to use convolutional neural network (CNN) for the classification of brain functional connectivity between healthy control and SCZ groups. Vector autoregression (VAR) model is used to extract connectivity features from schizophrenia EEG signals and directed connectivity at different EEG frequency bands is computed via partial directed coherence (PDC). Results show that the classification with high accuracy is achievable using VAR model. From the result, the performance of CNN reaches 86.9% over five-fold cross validation that considered to be good accuracy for the CNN to do a good prediction. The results also show that time-domain VAR features performed better than frequency domain PDC features. CNN provides a more practical method in classification between healthy and schizophrenic brain connectivity.
Analysis of Breathing Patterns from Thermal Images Using an Automated Segmentation Method
Authors: Arzaee A H , Lee J K , Shakhih M F M , Al-Ashwal R , Wahab A A 
Published: July 2020

Abstract
Breathing is one of the important vital signs in diagnosing and monitoring for patients’ treatment and disease. Few modalities have been used to evaluate breathing activity such as respiratory belt, thermistor and capacitive sensor. However, these requires external attachments such as electrode or sensor which might be inconvenience over long period of time. Hence, we proposed the use of thermography as a contactless monitoring device. In this study, inspiration time and expiration time of three different breathing patterns such as normal, prolonged and rapid breathing patterns were measured by using the thermography. Thermal images obtained from the subjects were processed and analysed by using an automated segmentation method which integrate the knowledge of edge-based and region-based segmentation methods into the algorithm developed. The algorithm developed in this study has shown that the tracker was able to segment the region of interest of the thermal images automatically and it provides a more accurate and stable results than manual calculation method. Thus, three different types of breathing patterns could be identified based on the inspiration time to expiration time ratio. Results shows that there was less than 5% of relative error which suggest the benefit of this algorithm.
Virtual Instrument Based Real Time ECG Monitoring Device
Authors: Singh Om Prakash , Malarvili MB 
Published: July 2020

Abstract
This study presents a real-time ECG monitoring system based on a virtual instrument. The device was designed using surface electrode, lead wire, instrumentation amplifier (IN114), and passive low pass filter with cut-off frequency (fc, 180 Hz). Thereafter, the ECG signal was transferred via DAQ card by initializing the analog input and sampling rate to the Labview for further analysis. Further, digital notch filter (fc, 47 to 53 Hz), bandpass filter (fc, 0.05 to 20 Hz), and FIR high pass filter using Kaiser window (order-56, and fc – 3.5 Hz) was employed in order to remove the power line interference, detect fiducial point from ECG, and eliminate the baseline wondering. In addition, we examined the various wavelet to choose the best to use wavelet denoise based on signal-to-noise ratio (SNR). Finding suggests the SNR (58.75 dB) of sym8 wavelet was higher comparing with another wavelet. Hence, the wavelet denoising was implemented into the developed device to remove the distortion and to detect the better peak in real time. Further, multiresolution analysis with Haar wavelet with the decomposing level of 1 was incorporated into the developed ECG monitoring device to detect the R-R peak, followed by automatic heart rate detection. Thus, this finding suggests the promising result that has the potential to assess the cardiovascular conditions. In future, the developed device will be tested with healthy subjects in order to standardize the functionality and significant features will be extracted from the morphology of ECG waveform for the analysis of cardiovascular diseases.
Material and chemical stability of using motor gasoline/automotive gasoline in piston engine aircrafts – a review
Authors: Kumar T , Mohsin R , Majid Z A , Ghafir M FA , Wash A M 
Published: July 2020

Abstract
Piston aircraft engines commonly operate on aviation gasoline (AVGAS) and motor gasoline (MOGAS). Engines such as JABIRU and Lycoming have the capability to run on both types of gasolines. Currently, MOGAS often comprises a specific percentage (3-10%) of bio-alcohol. In this regard, the material and chemical stability of MOGAS must be considered by aircraft operators to understand the possible impact of using this gasoline as aviation fuel. Some aircraft manufacturers recommend MOGAS to power aircraft engines, although AVGAS may still be employed as well. Some manufacturers are currently designing engines capable of operating on both types of fuels because in the future AVGAS would be less available compared to MOGAS. Operating a piston engine aircraft using MOGAS presents several issues owing to the side effects associated with ethanol contained in the blended fuel. This paper studies the factors affecting the use of MOGAS in piston aviation industry as the only approved fuel for piston aviation is AVGAS, a leaded fuel in terms of chemical and material stability and compatibility.