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EUREKA : Physics and Engineering
Number of Followers: 2  

  This is an Open Access Journal Open Access journal
ISSN (Online) 2461-4262
Published by Scientific Route OÜ Homepage  [8 journals]
  • DETERMINATION OF MECHANICAL PROPERTIES OF REPAIR MORTARS USING IN SITU
           METHODS UNDER DIFFERENT CURINGS

    • Authors: Ali Saberi Varzaneh, Mahmoud Naderi
      Pages: 3 - 18
      Abstract: Considering the differences between environmental conditions of concrete structures and laboratory conditions, it is important to determine the parameters of the materials at the site of the structure. One of these materials is cement-based repair mortars due to the damage of concrete structures that may arise due to chemical or physical factors, these structures are required to be repaired. For this reason, in this paper, to determine the strength of repair mortars of different ages and under different Curing, Situ methods "Friction-Transfer" and "Pull-off" were used and the relationships between the Flexural Compressive, Tensile and readings obtained from the above methods on cementations mortars are presented. Experiments were performed on mortars at ages 3, 7, 28, 42 and 90 days under the conditions of "waterlogging", "Curing Agent" and "releasing in the outdoor". The results show the high impact of the process on the Flexural Compressive, Tensile of the repair mortars and the results of the "Friction-Transfer" and "Pull-off" methods. Also, a high correlation coefficient was obtained between the mechanical properties of the mortars and the results of the above tests; it is possible to measure the mechanical properties of repair mortars in situ with high confidence and in situ
      PubDate: 2020-03-31
      DOI: 10.21303/2461-4262.2020.001190
       
  • INFLUENCE OF FINE ADDITIVES AND SURFACTANTS ON THE STRENGTH AND
           PERMEABILITY DEGREE OF CONCRETE

    • Authors: Oksana Shkromada, Andriy Paliy, Oksana Yurchenko, Nadiia Khobot, Alina Pikhtirova, Ivan Vysochin, Ganna Fedorenko, Anatoliy Paliy
      Pages: 19 - 29
      Abstract: The results of studies to determine the effect of titanium dioxide nanoparticles (nanoTiO2), finely dispersed anatase crystalline titanium dioxide (anatazTiO2) and surface-active substances (surfactants) on the compressive strength, degree of permeability and thermal stability of concrete samples are presented. Adding particles of nanotitanium, anatase titanium and surfactants up to 2 % to cement accelerates the hydration process and increases the strength of concrete, and also has a strong effect on its microstructure.As a result of the studies, it is experimentally proved that the compressive strength of concrete increases with the addition of titanium dioxide (nanoTiO2) nanoparticles by 23.2 %, finely dispersed anatase crystalline titanium dioxide (anatazTiO2) by 21.7 % to 5 % concentration by weight.In addition, the introduction of these additives reduces the permeability of concrete. This is due to a decrease in the absorption of concrete by water with the addition of nanotitanium and anatase titanium. The introduction of additives from 1 % to 5 % by weight in concrete reduces the depth of chloride penetration by 10–15 times, compared with the control.The use of temperature-programmed desorption mass spectrometry (TPD-MS) method has shown that an increase in the percentage of TiO2 nanoparticles to 5 % in concrete mixtures correlates with an increase in microporosity and dispersion level of these mixtures, which causes a shift in the peaks of intense gas evolution from the samples when heated to the side low temperatures (for example, carbon dioxide CO2).The resulting concrete samples are planned to be used for the manufacture of floors in livestock buildings. The injected additives are selected because they are not toxic substances and, in contact with the biological environment of livestock buildings (urine, feces), will not react with them
      PubDate: 2020-03-31
      DOI: 10.21303/2461-4262.2020.001178
       
  • EFFECTIVENESS EVALUATION OF STEEL STRENGTH IMPROVEMENT FOR
           PYRAMIDAL-PRISMATIC BUNKERS

    • Authors: Yukhym Hezentsvei, Dmytro Bannikov
      Pages: 30 - 38
      Abstract: In accordance with the recommendations of specialized professional literature, steel pyramidal-prismatic bunkers are projected for a service life of 20 years. However, in practice this term is often twice, or even three times lower. This is especially true for complicated operating conditions, in particular the effect of increased loads and low temperatures. Existing design techniques for such structures, both in European practice and the design practice of Ukraine and other CIS countries do not pay attention to these aspects. Therefore, in the practice of operation, the increased accident rate of steel bunker capacities has already become virtually a common occurrence.One of the possible ways to solve this problem is presented, which consists of using instead of traditional steels of ordinary strength with high plastic properties, steels of increased or high strength with reduced plastic properties. At the same time, clear theoretical recommendations are provided for choosing the right steel depending on the operating conditions, primarily when exposed to increased loads. The recommendations are presented in a form convenient for practical engineering applications.The proposed approach allows to reduce the material consumption of structures of this type on average according to theoretical estimates by 25-30% without reducing their bearing capacity. Their durability is also further enhanced by improving performance at low temperatures. Thus, the applied aspect of such a solution to this above problem is the possibility of increasing the overall reliability of steel bunker capacities, as well as reducing the cost of their periodic maintenance and repair work.A practical illustration of the presented approach is also given on the example of the design of bunkers of a bypass track for supplying charge materials for blast furnaces of one of the metallurgical plants of the northern location. As a result, this created the preconditions for monetary savings of about 0.5 million UAH in prices 2019 (about 20,000 USD)
      PubDate: 2020-03-31
      DOI: 10.21303/2461-4262.2020.001146
       
  • DEVELOPMENT OF ALGORITHMIC MODELS FOR RESEARCH OF RELIABILITY PARAMETERS
           OF TROLLEYBUS TRACTION ELECTRIC MOTORS IN THE OPERATION PROCESS

    • Authors: Vyacheslav Shavkun, Tatyana Pavlenko, Olha Kozlova
      Pages: 39 - 46
      Abstract: The analysis of the reliability parameters of traction engines during the operation of trolleybuses in different modes is done. The presented groups of operational factors are lead to the emergence of censored samples. The methods of express analysis of engine reliability using technical diagnostic tools are determined. A block diagram of an algorithmic model for studying the reliability parameters of traction electric motors of trolleybuses during operation has been developed. It allows at any time to evaluate the influence of operational factors on the reliability indicators of traction electric engines and to more clearly and reasonably assign organizational, technical and preventive measures.It has been established that the effective and reliable operation of urban electric transport, in particular trolleybuses, depends on the reliability of individual components and assemblies of rolling stock, as well as on the quality and timely control of their parameters during operation.In practice, it has been proved that failure of traction electric motors (TEM) of trolleybuses leads to significant material losses at electric transport enterprises. And one of the main parameters of reliability of traction electric motors of trolleybuses is the reliability of operation during operation.Based on the research results, practical recommendations are developed on the rational choice of diagnostic parameters. Their implementation at electric transport enterprises will increase the reliability of traction electric motors as a whole up to 10 %.The developed methodology allows the study (assessment) of the reliability parameters of any type of traction engine of a trolley during operation
      PubDate: 2020-03-31
      DOI: 10.21303/2461-4262.2020.001174
       
  • STUDY OF THE PROBLEM OF OPTIMAL MAINTENANCE OF UNMANNED AERIAL VEHICLES IN
           CONDITIONS OF A SHORTAGE OF VEHICLES

    • Authors: Denys Medynskyi, Iryna Borets
      Pages: 47 - 57
      Abstract: The ways to find the ways of solving the problem of optimal service for unmanned aerial vehicles in the conditions of vehicle shortage are explored.In the study of theory of optimal control and discrete optimization insufficiently explored the problem of optimal graph coverage by the chains of a fixed pattern with the help of a description system of ordinary differential equations.With the help of the graph theory investigated the optimization problem of the «Upper Cover» for unmanned aerial vehicles service in the conditions of vehicle shortage has been solved.Study of the problem relates to the mathematical dependence of transport systems. It can be used for determination of the optimal ratio between the amount of Unmanned Aerial Vehicles and fuel (electricity) reserves used by the Unmanned Aerial Vehicles. The method of solving the problem of determining the weight of the arcs of the graph and the problem of constructing a chain is based on that dependence. Part of the problem is the task of docking. The combinatorial task of choosing a set of stations for servicing points of the initial unmanned aerial vehicles dislocation is based on the dependence mentioned. Effective method for solving the problem of optimal coverage of a graph for supply chains with constraints is developed on the bases of the dependence.The proposed research methods can significantly reduce the cost of delivery of urgent goods using unmanned aerial vehicles.The proposed research methods can significantly reduce the cost of delivery of urgent goods using unmanned aerial vehicles. Perspective of further researches is studying of mathematical model of optimal servicing the delivery areas in the conditions of the lack of UAV. The constraints for practical purposes must have a group-theoretical approach to solving optimization problems and be reduced for the constructing an optimal cost matrix analysis. Algebraic approach is used, when there is a need in solving a large set of similar types of optimization problems with different constraints in the right hand side only.It is possible to apply a heuristic algorithm for solving the problem of optimal UAV service. The problem means optimal coverage of a special graph with chains with restriction on the chain length
      PubDate: 2020-03-31
      DOI: 10.21303/2461-4262.2020.001170
       
  • HERMITE NUMERICAL METHOD TO ESTIMATE THE RADON AND RADIUM EFFECTS OF THE
           SOIL IN BARTELLA REGION

    • Authors: Hekmat SH. Mustafa, Malik H. Kheder, Sarah Ghanim Mahmood
      Pages: 58 - 64
      Abstract: The Hermite numerical interpolation method used to estimate and predict the radon and radium concentrations, from some of the experimental measurements made on the soil samples of the Bartella region in Iraq. The results obtained from deductible mathematical method were close to real experimental results. Predicted results are in the range of 80.04–4051.59 Bq/m3 radon concentrations and 0.322–17.276 Bq/Kgradium concentrations corresponding to 200-10000 tracks of alpha particles. The maximum errors were less than 0.289 and 1.172 percent for radon and radium concentrations, respectively. The effects of radium and radon radiations estimated of soil in the studied area depend on its concentrations, a higher number of alpha particle tracks mean high radiation concentration, the high radiation will cause human health damage. The values are below 370 Bq/Kg the recommended radium concentration permissible values, by the Organization ащк Economic Cooperation and Development (OECD), the studied area is safe from hazards on health of radium and radon exposure from the soil
      PubDate: 2020-03-31
      DOI: 10.21303/2461-4262.2020.001173
       
  • ALPHA EMITTERS RADIOACTIVITY CONCENTRATIONS IN SOME COSMETICS USED IN IRAQ
           USING LR-115 DETECTOR

    • Authors: Malik H. Kheder, Hanaa N. Azeez, Firas M. Al-Jomaily
      Pages: 65 - 70
      Abstract: Cosmetics play an important role of human external appearance, its products used to alter or enhance the facial appearance or the body and skincare, currently worldwide consumed with frequently use increasing the human body exposure to the various chemical elements including radioactive substances. This research aimed to measure the concentrations of alpha emitters, and the annual effective dose AED resulting from radon intake. LR-115 track detector used to measure radon, and radium concentrations in 20 cosmetics samples selected from markets. In this work the concentrations of radon in the samples found to vary from 9.876 to 30.97 Bq/m3 with 22.11 Bq/m3 a mean value, this mean value is a very small than 100 Bq/m3 the reference level limits of the World Health Organization (WHO). The annual radon effective dose varied between 0.249–0.781 mSv/y which is within the range of 0.2-10 mSv/y (UNSCEAR). Radium contents vary between 0.041–0.249 Bq/Kg with 0.115 Bq/Kg as a mean value. This work identified law measured concentrations of radionuclide present in cosmetics showed its safe for use
      PubDate: 2020-03-31
      DOI: 10.21303/2461-4262.2020.001171
       
  • CRYSTAL STRUCTURE ANALYSIS OF K3VF6 COMPOUND

    • Authors: Viktor Zavodyannyi
      Pages: 71 - 82
      Abstract: The object of research is the crystal structure of the a phase of K3VF6 compound. From the analysis of the literature it follows that there are three modifications of this compound – the a phase, the b phase and the g phase. There are also several methods for preparing this compound. One of the problem areas is the existence of a large number of diffraction spectra obtained with the Bragg-Bertrand survey geometry in the PDF-2 database for 2004. There is also no complete data on the crystal structure of this compound. A structural model is proposed for the diffraction spectrum of the compound under the number 00-037-0738.The study used the PDF-2 database for 2004. As well as the HighScorePlus program, which allows to refine the microstructural parameters of the structural model by the Rietveld method.As a result, it is found that this diffraction spectrum of the compound under study can correspond to the following structural model: tetragonal system with lattice periods a=12.3524(4) A0; b=12.3524(4) A0; c=16.7447(7)A0. A possible spatial symmetry group is I41/a (88).Analyzing the obtained results, it can be assumed that the studied structure of the a phase of the compound crystallizes in its own structural type
      PubDate: 2020-03-31
      DOI: 10.21303/2461-4262.2020.001175
       
  • MODELLING SUPPORT SYSTEMS FOR SELECTING PROFESSIONS FOR APPLICANTS IN THE
           CONTENT OF PERSONALIZATION OF EDUCATION

    • Authors: Huseyn Gasimov
      Pages: 83 - 97
      Abstract: Various methods are currently being used in examining the initial “START” knowledge of applicants and their placement for specialties. Studies show that applicants are placed on the decreasing principle in terms of their overall scores at universities. In this case, applicants with a high level of knowledge are placed in the prestigious specialties as medicine and law as they require high results. Though, while applying for other professions, the applicants do not perform enough results on the key disciplines for the profession, they are placed in those professions when the general results enable it. This causes them to face a number of problems while working both in education process and in the industry.To avoid this problem and to place applicants in a specialty that is more relevant to their level of knowledge, the introduction of an individual approach to the evaluation of initial level of knowledge may be more promising.This article presents a modeling of the "evaluation – placement" support system for the individual approach to assessing applicants' knowledge and positioning them in relevant specialties. The main goal of the system is to give each applicant the opportunity to choose and study the specialty that is more relevant to their knowledge and skills, as well as to analyze the results for each discipline along with the overall results. The system is implemented using fuzzy logic based artificial neural networks.The network consists of 100 neurons in the input layer, two hidden layers and one output layer. The number of neurons at the output is the same as the number of specialties taught at university.
      PubDate: 2020-03-31
      DOI: 10.21303/2461-4262.2020.001181
       
  • SMART PHARMACY MONITORING SYSTEM BASED ON MQTT PROTOCOL USING RFID AND
           RASPBERRY PI

    • Authors: Fahad Ghalib Abdulkadhim, Zhang Yi, Mudassar Khalid
      Pages: 98 - 104
      Abstract: Smart mobile pharmacy has become a necessary requirement in improving the quality of healthy life in the last five years. Determining the type of medication and calculating the dose for each patient according to the patient's condition, monitoring the patient at the post and how to take the doses on time have a great effect on improving the patient's condition as soon as possible.In this paper, a system of monitoring, monitoring, and guidance based on potency management have been designed to contain a cloud data storage platform and its implementation to solve the above problem.The system is achieved by connecting each item (Medicine bottle) to a device (RFID) to verify that the patient has arrived in the bottle the correct medicine and is equipped with suppression of the treatment of the drug contains the sensors of weight to be sent all information to the control unit to be over the Internet through the routing portal.All data is stored in the first two data folders, which are static and the second is mobile. Synchronization between the two stations is performed to update the information and will be executed on a server that uses an MQTT protocol to register and integrate messages on the platform. The results of the experiment show the speed of guidance and reduce cost and reduce energy.
      PubDate: 2020-03-31
      DOI: 10.21303/2461-4262.2020.001207
       
 
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