bluuebunny/crossref_metadata_2025 huggingface dataset:
Multi-criteria choice of the software package architecture for automating the analysis of the forest vegetation state
Authors: Potryasaev S A , Pimanov I Y , Semenov A E
Published: August 2021

The article describes a method for solving the problem of choosing the architecture of a software package (SP) of an information system for analyzing the state of forest vegetation, carried out using distributed information resources and calculation modules which usually belong to various organizations. The SP quality indicators can be assessed using both quantitative and qualitative scales. The proposed method is based on the joint application of the mathematical apparatus of the fuzzy sets and experimental design theories. It is shown that the predominant type of architecture for this class of tasks is the service-oriented architecture, which provides the best value of the integral indicator of the SP quality.
Airborne remote sensing for forest inventory attributes assessment: experience of Flying Laboratory of Imaging Systems (FLIS) in the Czech Republic
Authors: Brovkina O , Hanuš J , Novotný J
Published: August 2021

The paper contributes to the recent studies for forest inventory attributes assessment from airborne data using experience of Flying Laboratory of Imaging Systems (FLIS).The advanced methods of airborne hyperspectral and laser scanning data processing are summarized to demonstrate the applicability of FLIS in assessment of forest inventory attributes for tree and plot levels in selected forest areas in the Czech Republic. Specifically, assessments of tree height, tree position, crown base, crown width, aboveground biomass, species composition, dead trees, and health status are presented.
Effect of the structure of wood on the results of ultrasound
Authors: Fedyaev A A , Chubinsky A N , Batireva I M , Sokolova E G , Kovalenko I V
Published: August 2021

In article defined the influence of wood density and angle of annual rings on the deviation angle of the ultrasonic (US) signal (beam) by using the through transmission method of sounding wood. For achieving most-reliable control of glued structures, the requirements for the size of transducers were formulated.
Application of laser technologies in remote sensing of forest areas
Authors: Karmanov A G , Karmanova N A , Hegai D K , Vagizov M R
Published: August 2021

The article presents two methods of laser technologies application in remote sensing of forest areas: holographic synthesis of stereoscopic image based on remote sensing dataand airborne laser scanning. Both methods are required to obtain data for forest inventorycalculating.
Precipitation forecast based on the Bayesian Network
Authors: Khabarov S P , Shilkina M L , Vasiliev N P
Published: August 2021

The purpose of the article is to consider an alternative approach to the forecasting meteorological events by using expert systems based on the Bayesian network (belief network). Also there is an example of building a Bayesian network capable to predict a type and a probability value of precipitation, with implementation it in the HUGIN software, considered in the article. The conclusion considers the positive and negative aspects of the presented approach.
Blockchain –killer of illegal wood
Authors: Lobovikov M , Pryadilina N , Scherbak I
Published: August 2021

Distributed Ledger Technology (DTL) is a leading technologies in the current “digital revolution”. The new technology is a real boon for the national forest sector. It may bring the Russian forest sector to the forefront of competitiveness and efficiency. However, the internal shortcomings, dangers, and threats of the new technology should be timely studied and eliminated. The “digit” is as strong as nuclear power. It is able to bestowhumanity or cause a global catastrophe if mishandled andmistreated. This fully applies to the forestry sector.
SWOT matrix analysis of the enhancing the effectiveness of education in the context of digitalization
Authors: Mushkarova O , Mikheeva M , Nefedova I , Chepic F , Vasiliev S
Published: August 2021

The article discusses the opportunities and threats of distance education in order to form the full scale competencies of the students. Based on the results of the study, the reasoning of the application of the most effective rational techniques, teaching methods based on digital technologies in the offline learning mode is given.
The dependence of delivery capacity of log trucking industry research by means of simulation modelling
Authors: Rukomojnikov K , Mokhirev A , Medvedev S , Ivshina A , Lyshko A
Published: August 2021

Dependence of delivery capacity of log trucking industry research by means of simulation modelling results are described in this article. In this research article the significance of logging industry development are grounded. Delivery capacity of log trucking and development of quality of forest infrastructure are marked as key problems in improvement of the forest industry effectiveness. The main research method is simulation modeling, by means of which theoretic models that help to evaluate the delivery capacity are devised. The factors which affect on capacity were also analyzed. The results were approbated by the example of logging operations in Krasnoyarskiy region.
Synergetics of subject-object interactions in the context of the digital paradigm
Authors: Tatarenko V N , Melentieva N I , Polyanskaya O A , Schaitarova O E , Tereshchenko S V
Published: August 2021

Digitalization, which has already penetrated almost all spheres of human life (for all the conventionality and even controversy of this term), which was the result of intensive, potently increasing changes, the beginning of which can be attributed to the time of the appearance of the first computers (1940s–1950s), today has reached such a scale and influence that, in fact, has already become a part of us. As the level of “intellectualization” of digital systems developed and increased, conditions were gradually created for the human world to actively “mix” with the world of technology. We currently live in a new paradigm, i.e. in a new, digital civilization, and it is obvious that digitalization and digital technologies are the main paradigm-forming factor of this new system of life.
Allometric models of Picea spp. biomass for airborne laser sensing as related to climate variables
Authors: Usoltsev V , Kovyazin V , Tsepordey I , Zalesov S , Chasovskikh V
Published: August 2021

Over the past two decades, active airborne laser sensing technology has been intensively used to scan the forest cover, providing such morphometric indicators of trees as the width and projection area of the crown, the height of the tree. The author’s database of harvest data of 1550 model trees of genusPiceaspp. of Eurasia is used in the work. Allometric models of biomass components, including the crown width, tree height, winter temperatures and precipitation as independent variables, are designed. The biomass of all components of equal-sized trees is described by the propeller-shaped 3D picture. In cold regions, when precipitation increases, the biomass decreases, but as one moves to cold regions, it is characterized by an opposite or neutral trend. As the temperature increases in humid regions, the biomass increases, but as the transition to dry conditions begins to decrease.
Application of ensemble machine learning methods for modeling the heights of individual forest elements based on inventory data processing
Authors: Vagizov M , Potapov A , Navalikhin S , Bakeyeva A , Stepanov S
Published: August 2021

Machine learning techniques open up new opportunities for research, analysis and can be obtained from forest inventory. Ensemble machine learning methods contain several alternative learning models for predicting characteristics and improving the analysis efficiency of processed data. One of the goals of inventory data analysis is to model heights for individual forest elements, which will allow to build the most accurate models of forest stands growth.
Use of data mining methods in planning and management at Russian wood enterprises
Authors: Zakharenkova I A , Belyaeva T P , Igotti I N , Terenteva T O
Published: August 2021

The purpose of this article is to disclose utilization capacity of the Data Mining method for data mining (DM) at Russian wood enterprises. The authors provide a rationale for use cases of the data mining technology – a combination of mathematical tools and recent developments in the technology industry –for the purpose of efficient system planning and management. On the basis of researches previously conducted by the authors, a list of problems and tasks is provided by the areas of activities of wood enterprises, resolved through the use of Data Mining methods.DM significance and relevance have been emphasized with regard to adoption of efficient managerial decisions in the area of production at Russian wood enterprises.
The calculation of the parameters of disc-shaped hydraulic fracturing crack propagating in hard rock roofs of a coal seam near the in-seam working
Authors: Cherdantsev N V
Published: August 2021

The model of geomechanical state of the disc-shaped hydraulic fracturing crack that propagates in hard rocks near the in-seam working was developed. The peculiarity of the model is in non-homogeneous stress field which is conditioned by the presence of the working. This field plays an important role in calculating the trajectory of the crack propagation and under certain conditions it drastically changes the direction of the initial crack. The problem of the rock massif stress state in the vicinity of the in-seam working is narrowed to the second exterior boundary value problem of the elasticity theory for integrated singular equation. It can be reached by substituting limit stress coal seam marginal zones by their acting stresses. Analyzing the results it is defined that when the ratio of the working liquid pressure to the gravitational hard rock pressure equals four units the trajectory of the crack is linear and coincides with the direction of the initial crack. If the ratio of the working liquid pressure to the gravitational pressure changes from three to four units the trajectory of the crack looks as a gently sloping curve that insignificantly changes its direction towards the initial crack.
Determination of filtration properties of coal seams during mine measurements
Authors: Tailakov O V , Utkaev E A , Makeev M P
Published: August 2021

A brief analytical review about the issue status on monitoring the filtration properties changes of a coal rock massif under the influence of hydrodynamic impact, undertaken with the purpose to stimulate gas recovery from coal seams, is given. The necessity of improving methods and equipment used to determine the near borehole zone permeability is substantiated. The design features of a device designed to connect an electronic pressure gauge to a borehole to provide continuous monitoring of pressure fluctuation in horizontal degasification wells during injection tests are presented. The results of coal seams permeability measuring undertaken in conditions of Kuzbass mines are presented and discussed.
Management of maintenance service and repair of heavy-duty mining equipment during its adaptation to the working conditions by the company Minetech Machinery LLC, official dealer of HITACHI
Authors: Bulakina E N , Nedzelskaya O N , Bikineeva A N , Moiseev V V , Pochufarov D O , Ketov A V
Published: August 2021

Mining industry is one of the main industries that determine the country’s energy sovereignty. This paper presents the study of the effectiveness of organizational and managerial decision making by a separate subdivision of Minetech Machinery LLC which is an official dealer of mining equipment Hitachi in the Russian Federation. The main indicator of the operational efficiency of heavy mining machines is the technical-preparedness factor of the equipment. The manufacturer recommends to carry out preventive maintenance and repairs on time for a trouble-free service of Hitachi mining equipment.
On the use of compensators in electric networks of mining enterprises
Authors: Malafeev S I , Malafeev S S
Published: August 2021

The electric power processes in the electric networks of the quarries during the work of excavators with various electric drive systems are considered. In the conditions of power supply of excavators from long cantilever lines, constantly changing network topology and a very uneven load schedule, an urgent task is to ensure the quality of electricity at the consumers’ inlets. Fluctuations and voltage deviations adversely affect the operation of excavators, the reliability and durability of electrical equipment, the functioning of protection, etc. Therefore, to effectively use the energy resource, it is necessary to use a set of methods and means aimed at reducing voltage and power losses in power networks, improving the quality of electricity and providing electromagnetic compatibility. Improving the efficiency of power supply to mining machines is provided by regulating the voltage and flow of reactive energy. The features of the use of fast-acting reactive power compensators to maintain the quality of electricity in quarry networks are considered.
Conditions for a start of sudden coal and gas outbursts in the breakage faces of coal mines
Authors: Zykov V S , Ivanov V V
Published: August 2021

Theoretical studies of the conditions of a start of sudden coal and gas outbursts in the breakage faces of coal seams were carried out and, as a result, expressions for the gradients of the active and passive forces of a sudden outburst were obtained. Their ratio makes it possible to determine the potential for the occurrence of this gas-dynamic phenomenon by the calculation method. On this basis, by means of mathematical transformations, a structural indicator was obtained, which allows the real outburst hazard of the coal mass to be directly monitored at the face, using operational methods for instrumental determination of the parameters characterizing its gas-dynamic state.
Investigation of the jaw crusher operation with backlash eliminators
Authors: Nikitin A G , Abramov A V , Bazhenov I A , Dorofeev V V
Published: August 2021

The condition for the appearance of additional dynamic forces in the presence of gaps in the journal bearings of the jaw crusher is determined. The design of the backlash eliminator equipped with pneumatics is described. It was experimentally established that the use of pneumatic devices for backlash elimination in the interfaces of the moving links, using journal bearings, during the operation of the jaw crusher, reduce the magnitude of accelerations and, therefore, increase the reliability of the crusher as a whole.
Analysis of effective tools for modeling mining and geological processes
Authors: Beliy A M , Pavlova L D , Fryanov V N
Published: August 2021

In modern conditions, modelling of production processes in various industries is not only a highly effective means of planning and visualizing the activities of an enterprise, but also an urgent scientific task. Modern modelling tools allow a wide range of scientific and applied research to be carried out to help plan the activities of the enterprise and identify new ways to gain competitive advantage. The modelling process itself is performed in specialized software packages with a wide range of capabilities.
Competitiveness of an IT Provider: from benchmarking and “Best Practices” to models and management mechanisms
Authors: Zimin A V , Burkova I V , Zimin V V , Ivushkin A A
Published: August 2021

The paper proposes the development of the approach described in the ITIL-3,4 library to the formation by an IT provider of competitive IT assets (called “best practices”). The ITIL mechanism provides for regular benchmarking in order to determine the composition and values of indicators of critical factors for the success of the market area and the formation by the IT provider by methods of the theory of asset management, the functioning of which ensures the achievement/superiority of market values of these indicators. The difference between the proposed approach consists in replacing the “best practices” of management with procedures for solving optimization and game problems, the mathematical models and control mechanisms of which are based on mathematics, control theory, decision theory and game theory. The proposed approach makes it possible to overcome such disadvantages of “best practices” as the averaging of the conditions for their application and their insufficient efficiency. This is achieved due to the multivariate formulation of control problems, and the multi-structure and optimality of control mechanisms. In conclusion, it is indicated that it is legitimate to consider the developed models and management mechanisms as a separate new type of IT provider assets.
Anti-hanging system of the hoisting equipment in the shaft
Authors: Yu Ostrovlyanehik V , Kubarev V A , Marshev D A
Published: August 2021

In this paper, the structure and mathematical description are proposed, as well as simulation of the protection system operation against hanging of the hoisting equipment in the shaft between the unloading curves and the dispenser is carried out.
Diagnostics of journal bearings in mining equipment
Authors: Kipervasser M V , Simakov V P , Laktionov S A , Modzelevsky D E
Published: August 2021

The issues of diagnostics of the state of friction units of mining equipment are considered. Mathematical modeling of the situation of “oil wedge” violation in the journal bearing was carried out and its influence on the stator current of the electric motor was estimated. The analysis of the simulation results using the apparatus of the “window” Fourier transform with the corresponding conclusions is made.
Corporate rent and its role in replication of regional resource dependence
Authors: Kavkaeva O N , Goosen E V , Nikitenko S M
Published: August 2021

For countries with significant natural resources, the process of distributing and managing rents plays a key role. For a long time, the influence of rent on the development of territories was assessed by comparing the dynamics of the growth rates of the gross domestic product of countries with resources and countries without natural resources-a macroeconomic approach. The criticism of this approach is well known. Much less studied is the microeconomic aspect of this problem-how a company extracts rent and how the method of withdrawing and disposing of corporate rent (excess income received by an individual company) affects the development of its host regions. The so-called resource regions are experiencing the greatest negative impact. At the same time, it is the activities of large mining companies that lead to a stable replication of the resource capacity of the economy-the dependence of the country’s well-being on income from the extraction and export of natural resources. The purpose of this article is to describe the mechanisms of extraction and distribution (corporate rent) at the level of mining companies and assess the impact of these processes on the host regions. PJSC Gazprom, PJSC Lukoil, OJSC UGMK, JSC SUEK were selected as examples. The choice of companies is due to their role in the relevant sectors of the fuel and energy complex, as well as the pronounced multidirectional influence of these companies on the regions. The methodological basis of the article is the concept of value chains. It is shown that the mechanisms for extracting and distributing corporate rent at the level of mining companies have a significant impact on the regions where they are based. The search for ways of optimal distribution and effective impact of natural rent on the development of resource regions through the formation of new value chains is proposed as a “treatment”. Interaction scenarios can be different: interaction with scientific and educational institutions or the creation of scientific and educational centers. It is proposed to stop special attention on the formation of new manufacturer-controlled value chains based on cooperation with vertically integrated companies.
Motor oil control in propulsion of modern transport vehicles: Review
Authors: Remizov S V , Korolev M K
Published: August 2021

The presence, quality and proper quantity of motor oil ensures smooth operation of propulsion system for the whole service life of transport vehicle. Oil film is formed during pressure feed of motor oil to structural elements of combustion engine via oil channels. Not every modern vehicle is equipped with automated oil level control.
Innovative component of the transformation of resource-based regions
Authors: Kagan E S , Goosen E V , Nikitenko S M , Pakhomova E O
Published: August 2021

The problem of changing the extensive model of economic development in Russia is directly related to the willingness of resource regions to move to the trajectory of balanced development. Therefore, the question of developing approaches and algorithms for assessing the readiness of resource regions for the development of technologically interconnected industries focused on the production of products with high added value is relevant. The solution to this issue is connected both with the selection of the most informative indicators, on the basis of which an assessment of this readiness can be made, and with a strong differentiation of resource regions. The purpose of the article is to study the possibility of a comprehensive assessment of the readiness of resource regions for the development of technologically interconnected industries focused on the production of products with high added value based on their investment and innovative activity. To solve the problem, the article presents and analyzes statistical information on investment and innovation activity of the studied group of regions for the period 2010-2017. The performed analysis allows us to conclude that the studied group of regions has significant heterogeneity. As an explanation of the causal mechanism, there are two main versions of the resource curse theory. They can be conditionally called “economic” and “political” resource curse. In the first, the so-called crowding-out effect has a negative impact on economic growth (or, in our case, innovation)-a high return on investment in the extractive sector leads to a reduction in investment in other sectors. Within the second framework, resource rent causes a drop in the quality of public administration, which, in turn, negatively affects economic growth. Within the framework of our study, it is difficult to unambiguously draw a conclusion about the causal mechanism that determines a lower indicator of the “innovative activity” component with an increase in the resource dependence of the region, however, the effect of the “crowding out effect” is more likely.
Algorithm for adjusting cargo delivery routes taking into account the state of the resource allocation system of the road and transport infrastructure
Authors: Buyvis V A , Yuryeva E N , Novichikhin A V
Published: August 2021

The features of the provision of transport and logistics services by road transport in the conditions of the Russian Federation are determined. The urgency of solving the issue of reducing costs by adjusting routes of cargo delivery by road transport is substantiated. It should be made taking into account the state of the resource allocation system of the road and transport infrastructure. An additional set of indicators is proposed, which allows the process of adjusting the routes of cargo delivery to be divided into three stages and taking it into account the state of the resource allocation system of the road and transport infrastructure. An algorithm is developed for adjusting the routes of cargo delivery, taking into account the state of the resource allocation system of the road and transport infrastructure. The problem of adjusting the routes of cargo delivery, taking into account the state of the resource allocation system of the road and transport infrastructure is solved. The proposed algorithm for correcting cargo delivery routes allows it to be used for solving the problem of multi-criteria choice optimization of the route option that best meets all the requirements declared by users of the road and transport infrastructure.
The efficiency of modeling and simulation of manufacturing systems using Petri nets
Authors: Blaga F S , Pop A , Hule V , Indre C I
Published: August 2021

The paper is a partial synthesis of the work that a team within the Faculty of Managerial and Technological Engineering has in the field of modeling and simulation of systems with Petri nets. The paper deals with three issues. The first part is Modeling and simulation of manufacturing systems with timed Petri nets. The first part presents the way in which the performances of some manufacturing systems are evaluated using timed Petri nets. The first example is a manufacturing system specific to the textile industry. The system has three production lines. In this case, the modeling with timed Petri nets allows the analysis of the operation of the flow lines and highlights the bottleneck. Another modeled manufacturing system is specific to a series production, more precisely it refers to the manufacture of gas cookers within a company from Oradea. The model with Petri nets also describes the supply sequences of the stocks of parts and subassemblies. The next modeled system is an automated manufacturing system for the packaging of detergents. The complexity of the Detergent Packing System and the high level of automation, require the use of efficient modeling and simulation methods to verify the validity of the solutions adopted. In this chapter is present the model of a robotic welding cell. The second part of the paper, the transition from timed Petri nets to hierarchical colored Petri nets, shows how Petri nets were developed for a robotic cell for metallographic analysis. The third part is dedicated to modeling with colored Petri nets timed with complex colors of the flexible manufacturing cell A007 within the Department of Industrial Engineering.
3D Modelling and FEM Analysis on Metal Coin Edge Punching Error
Authors: Gavrila C C , Lates M T
Published: August 2021

Minting metal coin, mean to impress a given relief model on both coin faces and also on the edge. Due to the high striking pressure, the round blank material is forced to fill the inner space between dies. In the past, for less coin value, the coin edge remained cylindrical, without any inscription. Following the increased coin value, it was introduced a security feature against forgery; on the coin edge model could be toothed or inscribed with relief or incuse text logo. Besides the coin edge basic design, a various amount of coin edge error types are released. In the paper there are studied some errors on the metal coin edge impressed with incuse text by punching. First, there are presented some particular examples and general aspects about the coin edge punching are also introduced. Then, the simplified 3D model of the parts is presented. Also, the finite element analysis on this model is realized and is achieved for different initial conditions. In the final part, the analysis results and conclusions are presented.
Oil condition monitoring and predicting actions using an Artificial Intelligence technique: Principal Components Analysis algorithm
Authors: Salem N.
Published: August 2021

Like other lubricants, oils play a crucial role in providing the space needed to separate moving parts. In addition, the lubricants ensure the suspension and transport of contaminants, neutralize corrosive acids, protect surfaces likely to wear, ensure heat dissipation, and provide the performance and increasing performance characteristics of industrial equipment and beyond. During use, lubricating oils undergo several chemical transformations due to oxidation at high temperatures (regime temperatures) due to degradation and contamination, water, ethylene glycol, coolants, waste residues. Finally, oils reach a lifetime due to a wide variety of degradation mechanisms, which lead to increased oxidation and nitration, base depletion, acid build-up, water contamination, cooling fluids, and viscosity changes. The rather complex nature of lubricants, along with the distinct variety of industrial equipment, especially the latest generation, equipped with high-performance techniques and artificial intelligence, make it very difficult, if not impossible, to predict all possibilities of generating defects. This study was intended to show how to expect action-time series data using Artificial Intelligence techniques on a set of data collected using direct/indirect sensors and computational determinations based on empirical relationships. The algorithm Principal Components Analysis (PCA) has been approached to predict the values of the next steps of any sequence by support vector machines (SVM) models. The PCA approach was considered a favourable experiment. The answers obtained characterize and equate the training sequences with values changed by a step of the time. This means that the data structure learns to predict the next step’s output value at each stage of the input sequence.
Choice of Offers by means of Multi-criteria Decision Systems, using Fuzzy Logic. Case Study
Authors: Prada A M , Blaga F S , Ursu M
Published: August 2021

This paper shows in detail the steps for the creation of an application in Matlab, using multi-criteria decision systems based on fuzzy logic. The aim of the application is to find the optimal offer for a client, based on the scores attained by simulation. In order to make the optimal offer in terms of quality and price for thermoplastic material parts, the main elements that are taken into account for the final price are cost of raw material, its quality and the price of the mould. The price of the raw material is mainly influenced by the annual necessary volume and by the project duration. The dimensions, the tolerances of dimensions, shapes and positions, the surface roughness, the coordinates of the critical points and the warranty of the mould have all a great influence on the price of the mould. This paper has two main chapters, of which the first one presents the selection procedure of an offer, and the definition of the multi-criteria decision systems that are used to evaluate the final offer, based on the accuracy of the choice for raw material and mould. The second chapter presents a case study which demonstrates the possibility to make such an application. The input quantities of the decision system must be carefully defined in order to attain results as coherent as possible.
Leadership approach towards Agile, Waterfall and Iterative implementation of the software development products
Authors: Popa O , Mihele C. , Făgărăşan C , Pîslă A.
Published: August 2021

The automotive industry is one of the most dynamic markets, gathering around many different sectors from material extractions to robotics and cloud computing. The current research analyses the influences and particularities of leadership and identifies the challenges and advantages of the two principal methodologies in software development projects within the automotive industry, Agile and Waterfall. Some aspects of reducing methodological disadvantages are suggested and presented. The aim is to arrive at a sustainable solution that can ensure the delivery of reliable and flexible software products. The impact of these methodologies on the quality standards and project documentation is analyzed, which is a vital part of automotive software development. By influencing the product development lifecycle, there is an opportunity to develop a structured framework that can be adopted to build software products in a more flexible and agile way.
Study of the clamping force in a pneumatic wedge device
Authors: Tocuƫ P D , Stanasel I , Avram F T
Published: August 2021

The continuous development of computing technology and design and manufacturing software applications have contributed to improving clamping devices used in manufacturing processes, which led to an increase in the quality of cut parts. This paper presents a study on the variation of the clamping force depending on the constructive and exploitation parameters of a pneumatic wedge device.
Experimental study on the settings of Delta and Cartesian 3D printers for samples printing
Authors: Ratiu M , Anton D M , Negrau D C
Published: August 2021

This paper presents the first part of the experimental procedures developed at the beginning of a larger research, consisting of printing, on two 3D printers, one parallel and one cartesian, of some test specimens, in different working conditions and with different settings of some parameters, and then investigation of the tensile and compressive behavior of the test specimens. The research was carried out on two sets of standardized samples, printed with three types of the commonly used and low-cost material, Polylactic acid (PLA), Carbon fiber PLA (CF-PLA), and Polyethylene terephthalate glycol (PETG). The purpose of the study is to create a database with the results obtained, which will be a working basis for future printings with these printer models, available in our laboratory, in order to understand the 3D-printed material behavior under certain available working conditions.
Modeling and building a 3D print head
Authors: Negrau D C , Grebenisan G , Vesselenyi T , Anton D M , Indre C I
Published: August 2021

The paper presents 3D modeling and the construction of a printing head for plastic, a head that will be used on a CNC milling machine. The component parts were modeled with Solid Edge software, and for manufacturing the parts we use a CNC milling machine and one conventional lathe. Following the manufacture of the parts, they were mounted together. After that, the mechanical parts was connected together with the electrical components and the result is a functional head that uses fused deposition modeling (FDM) technology.
Finite Element Analysis of the main stresses in Gamma Rod Osteosynthesis
Authors: Radu I G , Vultur E , Drugă C N
Published: August 2021

The paper presents the results obtained within the Finite Element Analysis of the Gamma rod, used to treat unstable fractures at the intertrohanteric and subtrohanteric level. Trochanteric fractures are a very common type of fracture found worldwide in both young and old people. The paper presents the main stages of the FEA, starting with the creation of the CAD model of the Gamma rod and ending with the Von Mises voltage field, for two of the most used titanium alloys used in the manufacture of rods (Ti-6AI-4V and Ti-6AI-7Nb). Finally, a series of conclusions are presented regarding the advantages of using Gamma rods in treating certain fractures at the trochanteric level.
Performance management – a strategic and integrated approach to ensuring the success of organizations
Authors: Mitrea-Curpanaru G G L
Published: August 2021

The performance of an organization is determined by: its level of coherence and stability; its ability to procure and use resources; of his reputation and image; the synergy of multiplying determinants such as employee relations, communication, mission, philosophy and leadership style, recognition, quality of organizational processes. Performance is defined by behaviors, but especially by results. A mixed performance management model is concerned with both inputs and outputs. The selection of the best model to improve performance is based on a self-assessment process. The complexity of managing an organization today requires that managers be able to measure performance and analyze the impact of different dimensions of performance on organizational excellence. Many experts in the field have started talking about the importance of measurement as a means of communication. The institution’s performance is analyzed on the basis of key internal and external performance indicators, established targets and existing trends, judged constructively, with the establishment of improvement targets. Any performance measurement indicator is also used as a tool to control it, effectively for the implementation of continuous performance improvement actions.
Building a continuous passive mobilization machine (CPM) for the inferior limb recuperation
Authors: Statache M G , Vultur E , Drugă C N
Published: August 2021

This paper is presenting the projection and realization of a passive mobilization device (CPM), used for rehabilitate lower knee articulation conditions, such as post-traumatic conditions, degenerative, ligamento-plastic chirurgical interventions, meniscectomy and in special patients who have had been under knee prosthesis chirurgical interventions, this one being the one which causes the biggest issues in the rehabilitation process. Also, in this paper are figured the main steps which are followed throughout the building process of a Low-Cost functional prototype and its way of function.
Area mapping for autonomous disinfection robot
Authors: Anton D M , Milas R C , Stiube A M , Stiube L E
Published: August 2021

This article presents an autonomous obstacle avoidance robot with infrared sensors. With the help of these robots, the automotive industry has developed, using various types of sensors, both parking using ultrasonic sensor models, to Lidar sensors that map the immediate proximity of the car in real time. These sensors, through different trail simulations, adjusts the direction of the car to avoid various obstacles, or to avoid the following traffic jams.
Enhancement of the photovoltaic performance of dye-sensitized solar cell using porous silicon layer as photoelectrode
Authors: Gamal Y , Abdallah T , Youssef G M
Published: August 2021

Porous Silicon Dye-sensitized solar cell (PS-DSSC) with N719 Dye was employed as photoelectrode. PS layers were formed on textured crystalline silicon CZ-Si (100) by electrochemical etching (ECE) in hydrogen fluoride (HF) based electrolyte at constant current density for different etching times. The morphological properties of the PS were investigated by scanning electron microscopy (SEM). The optical properties of the textured surfaces are studied using photoluminescence (PL) and reflectivity measurements. The bandgaps of PS from UV-Vis and PL measurements increase to 1.9 eV. The Current-Voltage (I-V) characteristics show that the short-circuit current density Jsc and the open-circuit voltage Voc increased as the porosity of the PS layer increased. These results show an improvement in the efficiency of PS-DSSC.
The Reliable Concrete Compression Strength Assessment by SCHMIDT Hammer for Different Concrete Grades
Authors: Elrazek Mostafa Abd , Shafy Gamal Yasser Abdel
Published: August 2021

The evaluation of the existing construction building is one of the urgent problems in the current era, different tests and methodologies can be used to get the required information about the properties of the structure so that the construction industry interests in applying the concrete test with the lowest time and cost, The purpose of this study is to present the combination between Nondestructive test (NDT) and Machine compression Test (MCT) to get the real results for the Schmidt hammer test method. All tests are created for different grade of RC concrete from medium to high grade with classes between Grade 200 to Grade 800, to study the Nondestructive test (NDT) and generate the comparison with the Machine compression Test (MCT), using different composition of the concrete with Varity in the proportion mix between ingredients of cement, water content, aggregate, all results have been represented tabular and graphically to notice any deviation between Destructive test (DT) and MCT test, Regression analysis was been used as a statistical method to get the variation between tests and establish as a linear mathematical relationship between compressive strength and rebound number and it can be illustrated that the variances between them in case of Low. the medium and semi-high grade is very low which means the null hypothesis is accepted according to the statistical analysis, and on another side, there are variances in case of very high grade according to statistical analysis.
Defected Photonic Crystal Array Using Porous GaN as Malaria Sensor
Authors: Tammam M.T. , Zaky Zaky A. , Sharma Arvind , Matar Z.S. , Aly Arafa H. , Mohaseb M.A.
Published: August 2021

A defective one-dimensional photonic crystal is investigated as a biosensor to detect malaria disease. The proposed photonic structure is air/(GaN/Porous GaN)N/Sample/(GaN/Porous GaN)N/Substrate. The red blood cells sample of the human being is used as a sample defect in the proposed optical device. The pioneer transfer matrix method is used to analyze the transmittance spectra. A change in sample refractive index highly affects the transmittance resonant peak and this shift in the peak plays a key role in the operation of the device. The relatively high figure of merit of 1022 RIU−1 with a sensitivity of 1472 nm/RIU and quality factor of 1076 is detected. The proposed sensor is relatively better than others available to detect malaria disease.
V-Trough Optimization for a Multipurpose Integrated Solar Energy Project in Helwan of Egypt
Authors: Abdel-Hadi Yasser A , Sabry Mohamed , Ghitas Ahmed , Singh Harjit , Redpath David
Published: August 2021

A solar concentrator of the type V-Trough is designed for a multipurpose integrated solar energy project in Helwan of Egypt. A suitable place in the NRIAG is selected. A concentration ratio matching the stability of the unconventional cooling technique for PV module 2.3 is chosen. A new cooling system with heat pipes for the module is manufactured. The optimum angles of setting the system for a maximum performance during the year are calculated using a ray tracing technique. The optimum dimensions of the PV module are 100 cm × 35 cm with an output voltage of 11.4 V and an output current of 4.29 A. The results show that establishing a solar thermal PV project with these conditions is promising for providing energy for off-grid local multipurpose integrated solar energy projects in that area.
Study Of The Optimum Conditions And Parameters To Perform Simulation Of Low Temperature Capacitive Radio Frequency Argon Discharge
Authors: Shihab M , Elsheikh M G , El-Ashram T , Moslem W M
Published: August 2021

Capacitively coupled plasma (CCP) is used extensively in plasma processing, such as, plasma etching, deposition, and sputtering. Particle-in-Cell (PIC) is used to explore the discharge dynamics microscopically. Considering all species in PIC simulation is challenging. Also, considering various atomic transitions, e.g., ionization, recombination, excitation, and deexcitation is not doable. The state of the art is to carry out fluid simulation. We compare between PIC and fluid simulation for radio frequency CCP to reveal the effect of various approximations as assuming constant temperature, simplifying Navier-Stokes equations in terms of particles mobility and diffusivity, and considering artificial boundary conditions at the electrodes. The fluid model predicts qualitatively PIC results in few minutes. For Argon discharge in geometrically symmetric CCP, the plasma bulk is quasineutral. Over the electrodes, two sheaths are built up due to the difference between ion and electron fluxes. The dynamics of two sheaths are out of phase. In the fluid model, chemical reactions and atomic processes can be considered. Argon metastable states density is maximum in the plasma bulk. In semi dark sheaths, metastable states concentration is small. The proposed fluid model could be used as a simulation platform to find the optimum conditions and to interpret experimental results.
Low-temperature Hydrothermal Synthesis of Titanium Dioxide Nanoparticles for Photocatalytic Applications
Authors: Shahat Abdelhamid M , El-Hossary F M , Ghitas Ahmed , Abd El-Rahman A M , Ebnalwaled A A
Published: August 2021

Titanium dioxide nanoparticles (TiO2 NPs) were synthesized by a surfactant-templated hydrothermal method at low temperature (75 °C) for photocatalytic applications. Investigation of structural, optical and photocatalytic properties of TiO2 NPs were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HR-TEM), FT-IR and UV – vis absorption spectroscopy. The structural analysis confirmed a polycrystalline tetragonal anatase TiO2 phase with nanocrystalline structure and almost regular spherical shape. It has been found that the synthesized TiO2 NPs have an energy bandgap value between 4.42 and 4.46 eV; achieving a photodegradation efficiency of methyl orange dye of 81% to 88 % under UV visible light.
Comparative neutronic study for heterogeneous and homogeneous fuel assembly in a lead-cooled fast reactor
Authors: Ibrahim Mohammed , Ibrahim Amr , Aziz Moustafa , Saudi H A , Hassaan M Y
Published: August 2021

ALFRED (Advanced Lead-cooled Fast Reactor European Demonstrator) is a (300 MW
th
) pool-type reactor with closed hexagonal Fuel Assemblies (FAs) which are divided into two radial zones (inner and outer core zones). In this work two three dimensional models (3D-heterogenous and 3D-homogeneous) for inner assembly (IA) and outer assembly (OA) have been designed using MCNPX transport code to simulate the neutronic behavior and to study the fuel performance and the effect of homogenization inside the fuel assemblies. The results of the present work for power distribution and fuel burn-up show good agreement between 3D-homogeneous and 3D-heterogeneous models.
Coherent states for a system of an electron moving in a plane
Authors: Aremua Isiaka , Gouba Laure
Published: August 2021

In this paper, we construct the coherent states for a system of an electron moving in a plane under uniform external magnetic and electric fields. These coherent states are built in the context of both discrete and continuous spectra and satisfy the Gazeau-Klauder coherent state properties Gazeau and Klauder (1999 J. Phys. A: Math. Gen.
32, 123–132).
Historical trends of riverine nitrogen loading from land to the East China Sea: a model-based evaluation
Authors: Nishina K , Ito A , Zhou F , Yan X , Hayashi S , Winiwarter W
Published: August 2021

East Asia is the one of the hotspot regions with too much reactive nitrogen (N) inputs from anthropogenic sources. Here, we evaluated historical total inorganic N (TIN) load from land to sea through the rivers surrounding the East China sea using biogeochemical model ‘VISIT’ combined with a newly developed VISIT Off-line River Nitrogen scheme (VISIToRN). VISIT calculated N cycling in both natural and agricultural ecosystems and VISIToRN calculated inorganic N transport and riverine denitrification through the river channels at half degree spatial resolution. Between 1961 and 2010, the estimated TIN load from land to the sea surrounding the East China Sea increased from 2.7 Tg-N Year−1 to 5.5 Tg-N Year−1, a twofold increase, while the anthropogenic N input to the East China Sea basin (N deposition, N fertilizer, manure, and human sewage) increased from 12.9 Tg-N Year−1 to 36.9 Tg-N Year−1, an increase of about 3 times. This difference in the rate of increase is due in large part to the terrestrial nitrogen budget, and the results of the model balance indicate that TIN load to rivers has been suppressed by improvements in fertilizer application rates, harvesting on agricultural land, and nitrogen accumulation in forests. The results of the model balance showed that the increase rate of nitrogen runoff from Chinese rivers has been declining since 2000. In our estimation by VISIToRN, the amount of nitrogen removed by river denitrification in the river channel before the mouth is not negligible, ranging from 1.6 Tg-N Year−1 to 2.16 Tg-N Year−1. The N load from agricultural sources is still significant and needs to be further reduced. TIN load tended to increase in years with high precipitation. In order to effectively reduce TIN load, it is necessary to consider climate change-adaptive agricultural N management.