bluuebunny/crossref_metadata_2025_split huggingface dataset:
Experimental method for determining the deformation of warp threads on looms
Authors: Makhmudova Nigar 
Published: March 2022

There is a large body of theoretical and experimental research aimed at determining the warp thread deformation and tension. Analytical solutions and mathematical models of the stressed state of the warp and weft threads in the formation of fabric were proposed. In almost all studies, the deformation of the warp thread was determined separately when shedding and beating the weft. There is an experimental method for determining the deformation of warp threads, which makes it possible to eliminate some of the shortcomings inherent in the theoretical techniques. However, that method has some drawbacks, such as the low accuracy of strain measurement and the complexity of certain measuring operations, which leads to an increase in the time spent on the experiment.
This paper reports a study that addresses those shortcomings by proposing to photograph the object being measured using a digital camera connected to a computer system to print the image. An electronic caliper that is used to measure the deformation of warp threads on printing paper takes into consideration a fraction of a millimeter when measuring.
The proposed method makes it possible to determine with sufficient accuracy and speed the deformation of warp threads in the elastic feed system of the loom, as well as allows visual control over the changes in the deformation of warp threads in the machine. The use of this method makes it possible to reduce the time of measuring the deformation of one thread from 30‒40 seconds to 5‒7 seconds, which is 5‒6 times less than that in the existing one and provides measurement accuracy to at least one dozen mm.
The results of this work could be applied to determine the warp thread deformation and tension on looms when making the main weave fabrics in order to reduce the uneven tension of the main threads, increase labor productivity, and improve the quality of the fabric.
Design and implementation of a fault tolerant web-based examination system for developing countries
Authors: Eko Ceasar E. , Eteng Idongesit E. , Essien Eyo E. 
Published: March 2022

This paper presents the development of a web-based examination system that focuses on automated resolution of faults such as power, network, or component failure that may occur when an e-learning system is used to conduct an examination. This system can withstand various challenges that hinder the adoption of e-learning technologies in developing countries. This is important because it will reduce the time and cost involved in conducting large scale examinations by tertiary institutions without the need to upgrade existing infrastructures. These institutions will not necessarily require uninterrupted power or network connection to conduct web-based examinations as the system can easily resume if such an incident occurs.
The architecture of the proposed web-based online examination system provides for integrated management of functions such as question pool creation and update, examination monitoring, failure toleration and recovery, automated grading, and randomization. The system also eliminates the need for manual scheduling of examinations which requires much planning and is error-prone. Different examinations can be scheduled to run simultaneously. The design technology adopted for the implementation is a client/server technology. The incremental software development model in conjunction with prototyping technique was adopted in the development of the web-based examination system due to the iterative nature of the developed software. The system was developed using PHP, JavaScript, Ajax and MySQL. The system has been applied to conduct an examination involving more than 20,000 students per semester at University of Calabar. It has been proved to save efforts of teachers and students.
Development of microwave technology of selective heating the components of heterogeneous media
Authors: Demianchuk Boris , Guliiev Shota , Ugol’nikov Alexander , Kliat Yurii , Kosenko Artem 
Published: March 2022

The relevance of solving the technological problem of guaranteed inactivation of microflora by heating in liquid media and the preservation of their useful components, in particular, in wine materials, is substantiated. Traditional heat treatment with heating up to 70...75 °C leads to a deterioration in the properties of the medium due to the thermal decomposition of its useful components. Newer is the technology of heating by the energy of the microwave field in the working chamber. But its significant drawback is the formation of standing waves in the metal chamber, causing local zones of overheating in places of maxima and underheating in places of wave minima. The consequence of this is the deterioration of the chemical composition of products and unsatisfactory inactivation of microflora.
The elimination of these disadvantages of microwave processing of media is proposed to be carried out in a non-resonant chamber developed by the authors. Selective heating in the new chamber is produced by the energy of a uniform microwave field. At the same time, there are no local overheating and underheating of products. The technical implementation of a non-resonant type chamber involves the concentration of field energy in the volume of production, the conversion of the ballast field energy into thermal energy and its utilization.
The work includes theoretical substantiation and experimental confirmation of the advantages of the new technology compared to the traditional one. Selective heating of products in a non-resonant working chamber entails the possibility of reducing the temperature required for guaranteed inactivation of microflora by 25...30 °C. This helps to preserve the components of the product due to the absence of overheating and reduce energy costs. In addition, it provides: exclusion of harmful radiation from the working chamber; prevention of self-overheating of the generator and exclusion of the dependence of the energy efficiency of the chamber on the level of its loading with products.
Determining regularities in the distribution of noise load from motorways and road bridges depending on the distance to a residential area
Authors: Laslov Sergii , Tokin Oleksndr , Onyshchenko Artur 
Published: March 2022

This paper reports the improved model for estimating transport noise from highways at a roadside lane under the influence of noise load from traffic flow moving on an open section of the highway and over a bridge.
It has been established that with an increase in the distance from the sound source to the coordinates of the noise load measurement, the noise decreases, both in the presence of a noise-protective screen and in the case of an open section of the highway. At 100 m from the sound source, the noise load level decreases by 13.4 % in the case of the car moving over a bridge, and by 13.3 % when driving a car along an open section of the road.
It has been found that the noise level on bridges exceeds the level of noise pollution from the road to 10 dB, which is explained by the propagation of different frequencies of noise load from the bridge.
It has been determined that due to the special nature of sound waves, diffraction through noise screens does not change all frequencies evenly. High frequencies diffract to a smaller degree while lower frequencies diffract deeper into the "shadow" zone behind the screen. Therefore, the screen is more effective at reducing sound waves with a high frequency compared to sound waves with lower frequencies.
Experimental studies into the effectiveness of noise-protective screens made of metal perforated structures on sections of public roads were carried out, taking into consideration distances from noise sources to noise load measurement sites.
It is established that noise-proof screens made of steel (perforated) sheet reduce the level of noise load from vehicles to the environment by up to 14 %.
It was found that when driving cars on the road, the equivalent sound level at a distance of 1 m in front of the noise protection screen is 88.6 dBA while the maximum sound level at a distance of 1 m in front of the noise protection screen is 103.9 dBA.
It has been established that in the presence of a drain hole in the noise protection screen, its acoustic efficiency is reduced to 3 dBA.
Modeling the method for determining the stimulated brillouin scattering threshold in a single-mode optical fiber
Authors: Zhumazhanov Berik , Zhetpisbayeva Ainur , Zhetpisbayev Kairatbek , Yerishova Mereke , Tolegenova Aray , Serikov Tansaule , Dunayev Pavel , Nauryz Kanysh , Kussainova Kaini , Uristimbek Gulzhazira 
Published: March 2022

Nonlinear optical effects in optical waveguides play an important role in the development of fiber and integrated optics systems for optical communication and information processing. On the one hand, nonlinear effects impose restrictions on the radiation power that can be transmitted through an optical fiber or light guide.
In this paper, the problem of the occurrence of the phenomenon from the stimulated Brillouin scattering (SBS) effect is investigated using two optical sources of rays in a single-mode optical fiber at joint waves of 1310 nm and 1550 nm. Due to the fact that in all trunk fiber-optic lines, the intensity and energy of input signals is limited due to the influence of SBS, methods are currently being sought to reduce the influence of this phenomenon.
It was found that the energy of the input beam in the combined propagation of the compound did not reach the value of the threshold of SBS in the values of 25 dBm and 27 dBm due to the discrepancy between the experimental results and the results of the model. The SBS effect was not observed when the threshold threshold of 15 dBm and 27 dBm – SBS was reached when combining a dual beam along a single optical fiber in one direction. As a result, by double integration, the value of the SBS threshold was raised, and the direction for future scientific research was determined. If the possibility of increasing the threshold of SBS is proved, then increasing the distance of amplifiers in the main networks, respectively, its economic effect increases. In addition, it can be noted that there are no scientific papers devoted to the study of the effects of optical nonlinear effects by combining and distributing these two compounds along a single optical fiber.
This article discusses the issues of improving the capacity and determination of the threshold for stimulated Brillouin scattering. To increase the power threshold is invited to consider the dependence of the phase modulation frequency of the spectral width of the laser radiation.
In addition, the fact that the SBS threshold did not reach the value at an energy of 27 DB in the case of the double-beam distribution can be proved by discrepancies in comparison with the results of experimental studies and the results of the model that determines the SBS effect
Influence of alcohol abuse and / or HIV infection on morpho-functional condition of the uterine tube in women of reproductive age
Authors: Lytvynenko Marianna 
Published: March 2022

The fallopian tubes are a key link in the relationship between the uterus and the ovary. The aim of our study was to determine the effect of alcohol abuse and / or HIV infection on the morpho-functional state of the fallopian tubes in women of reproductive age.
Material and methods. The study included sectional material, which was selected from 100 women of reproductive age (20 to 40 years), who were divided into four groups. The first group included section material from 25 women who had been laboratory confirmed for HIV. The second group included sectional material selected from 25 women suffering from chronic alcoholism. The third group consisted of sectional material from HIV-positive women who also showed signs of alcohol abuse. The fourth group includes sectional material selected from HIV-negative women.
Results. Gross pathological changes in the structure of the fallopian tube, due to both the impact of HIV infection and alcohol abuse was identified in each of the groups. Changes in morphometric parameters (length of the ampullary part, outer diameter of the tube at the junction of the isthmus in the ampullary part, the area of the lumen of the ampullary part) can cause severe complications of inflammation or lead to ectopic pregnancy. The study of the epithelial and muscular layer revealed destructive-sclerotic changes, which consist in reducing the height of the epithelium and increasing the proportion of connective tissue in the muscular layer of the tube.
Conclusions. According to the study, HIV and alcohol abuse are diseases that affect all elements of the fallopian tube. Thus, HIV infection and chronic alcohol abuse can exacerbate each other's negative effects on the female reproductive system and cause morphometric changes that can form a substrate for the development of inflammatory processes and lead to ectopic pregnancy
The analgesic and anti-inflammatory effect of lawsone isolated from Lawsonia inermis
Authors: Al-Snafi Ali Esmail , Talab Tayseer Ali , Alfuraiji Narjes 
Published: March 2022

This study aimed to assess the analgesic and anti-inflammatory effects of lawsone isolated from henna leaves (Lawsonia inermis).
Methods: A total of 120 healthy adult mice (weighing about 25±5 g) were included in this study. Sixty mice out of the total were used to determine LD50, 30 mice to determine the anti-inflammatory test, and the remaining (30 mice) were used for an analgesic test. The hot plate was used to determine the analgesic effect, while the anti-inflammatory effect was determined by the ability of the compound to minimize the inflammation and edema caused by the injection of carrageenan.
Results: Lawsone was isolated from Lawsonia inermis. A Stuart SMP10 digital melting point apparatus was used for measuring all melting points. Infrared spectrometer FT-IR 400D was used for measuring/recording IR spectra (KBr) which the frequency of absorption was represented as cm−1. For 1H-NMR spectrum recording, a Bruk-spectrophotometer of 400 MHz was used with internal TMS standard, with deuterated Ś 2.51 ppm for acetone-d6, remained solvent signals as well as 13C.NMR was used. TLC was utilized as adsorbent, UV light, or iodine-completed visualization to verify compounds' purities.
The LD50 of the oral lawsone was 96 mg/kg, and the highest dosage that did not kill any of the experimental animals was 80 mg/kg, which was used to investigate lawsone's analgesic and anti-inflammatory effects.
Lawsone and aspirin possessed an analgesic effect compared to the control group (p<0.0001 and p<0.001, respectively); however, lawsone induced a potent analgesic effect compared to aspirin (p<0.1). In contrast, Lawsone and aspirin exerted an anti-inflammatory effect (p<0.05) compared to the control group and were equipotent in carrageenan-induced hind paw edema.
Conclusion: It is concluded that lawsone possesses analgesic and anti-inflammatory effects, which endorse the practical medical importance of Lawsonia inermis. The latter is widely used traditionally for these purposes own to its cost-effectiveness and safety; however, further studies are required to determine the systemic safety of lawsone
Determination of voltage at the rectifier installation of the electric locomotive VL-80K for each position of the controller driver's
Authors: Goolak Sergey , Yermolenko Eduard , Tkachenko Viktor , Sapronova Svitlana , Yurchenko Viktor 
Published: March 2022

The object of research is the electrical processes in the control system of the traction drive of the electric locomotive VL-80K (Russia). To improve the accuracy of its mathematical model, it is necessary to use the values of the parameters determined during experimental studies of the traction drive control system. In particular, it is important to use in the traction drive model the value of the voltages on the arms of the rectifier installation of the electric locomotive, taking into account the position of the driver's controller. The complexity of the simulation lies in the fact that the reference does not provide the value of the voltage on the arms of the rectifier for each position of the driver's controller, which makes it difficult to verify the resulting model. A scheme for measuring the voltage value on the arms of the rectifier installation of an electric locomotive for each position of the position of the driver's controller is proposed. On its basis, a simulation model is developed in the MATLAB software environment. The simulation model implements an algorithm for closing the contactors of the electric group contactor for each position of the position of the driver's controller. Approbation of the voltage measurement technique was carried out on an electric locomotive of the VL-80K series during a trip on the Darnytsia-Myronivka section (Ukraine). Comparison of the voltage values on the arms of the rectifier installation, obtained experimentally, with the passport data showed that the measurement error was 0.5 %. In addition, the experimental results showed that the voltages on the arms of the rectifier for paired positions of the position of the driver's controller are the same, for odd ones they are different. Therefore, when simulating the operation of the traction drive control system, the voltage values on different arms of the rectifier installation were taken separately. Comparison of the simulation results for the nominal mode with passport data showed that for this mode the measurement error was 3.78 %. For all others, it did not exceed 5 %.
Research of plate granulator operation modes in the production of coarse carbamide granules
Authors: Nadhem Al-Khyatt Muhamad , Skydanenko Maksym , Ostroha Ruslan , Neshta Anna , Yukhymenko Mykola , Yakhnenko Serhii , Zabitsky Dmitry , Yesypchuk Symeon , Moskalchuk Oleksii 
Published: March 2022

The object of research is granulation of mineral fertilizers by the rolling method. One of the most problematic places is the uncertainty of the conditions of the temperature regime of granulation. The paper considers the technology for obtaining enlarged urea granules of prolonged action. It is indicated that an increase in the diameter of the granules to 7–10 mm increases the efficiency of the use of mineral fertilizers by the consumer. It is proposed to obtain large carbamide granules by rolling in a plate granulator. It is indicated that the setting of the optimal operating parameters of the tray granulator is an important factor in the efficient operation of the equipment. A scheme of a pilot plant for granulating mineral fertilizers is presented, a methodology for conducting experimental studies and design parameters of a plate granulator are described. It is indicated that in the process of experimental studies, the design parameters changed: the tilt angle of the plate, the height of the side and the frequency of rotation of the plate, the angle of opening of the spray jet by the hydraulic nozzle. In the process of research, the influence of regime and technological parameters, namely, the temperature of the layer on the plate is studied. As a result of experimental studies, the optimal ranges of design and regime-technological parameters for obtaining enlarged carbamide granules in a plate granulator were revealed. The influence of the location of the nozzle for spraying the melt on the layer relative to the plane of the plate is shown, which results in the particle size distribution of the granular product. It is indicated that a higher content of the commercial fraction in the finished product is observed when the layer in the left sector of the upper part of the plate is irrigated by the rising melt. A technique for determining the static strength of the obtained carbamide granules is given. A calculation equation for determining the static strength of a granule is presented. A diagram of a laboratory device for determining the static strength of granules is presented, which made it possible to determine the values of the static strength of granules for individual fractions, namely: for coarse, fine and commercial fractions. It is shown that the obtained values correlate well with standardized indicators.
Analysis of the inertia tensor of autonomous mobile robot
Authors: Ashhepkova Natalja 
Published: March 2022

The object of research is the inertia tensor of an autonomous mobile robot (AMR) with a manipulator with different configurations of their mutual position. As an example of the AMR design of a changing configuration, an all-wheel drive four-wheeled platform with a manipulator is considered, consisting of a docking disk rotating around a vertical axis and rod links of the arm connected by rotational kinematic pairs of the fifth class. The mass of moving structural elements, i. e., a manipulator with a load, is 10–20 % of the mass of the robot platform. Let’s consider that the links of the manipulator and the platform are absolutely rigid and homogeneous bodies with a constant density; let’s neglect the mass of kinematic pairs. The next step in the analysis of the AMR inertia tensor of a changing configuration can be a study taking into account the elastic properties of the manipulator links, the uneven distribution of the masses of the platform, and the characteristics of the kinematic pairs.
The dependence of the values of the elements of the AMR inertia tensor of a changing configuration on the values of the generalized coordinates of the moving elements of the structure and the ratio of the mass of the platform and the mass of the moving elements of the structure has been studied. The analysis of the inertia tensor of the AMR with a manipulator at different configurations of their mutual position showed that the values of the centrifugal moments of inertia of the system during the relative motion of the manipulator are commensurate with the value of the axial moments of inertia of the system, even if the mass of the moving structural elements is less than 10% of the mass of the platform. In most existing AMRs, the mass of moving structural elements is up to 20% of the platform mass, therefore, in the general case, the inertia tensor of such a system should be taken as off-diagonal and non-stationary. In the future, this will make it possible to refine the equation of dynamics, take into account the relationship of control channels, simulate the movement of AMR of a changing configuration, and optimize energy costs.
Since AMR with the manipulator is an example of the «changing AMR» object class, the results obtained can be applied to all objects of this class.