bluuebunny/crossref_metadata_2025 huggingface dataset:
Application of the mini-batch adaptive method of random search (MAMRS) in problems of optimal in mean control of the trajectory pencils
Authors: Panteleev A V , Lobanov A V
Published: June 2021

The article discusses the application of one of the new methods of constrained optimization to solve the problem of finding optimal control of a pencil of trajectories of nonlinear deterministic systems emanating from a given set of initial states. The structure of a feedback system is proposed, which contains a model of a control object, a measurement system model, a state observer that generates an estimate of the state vector from incoming measurements, and a regulator. The quality of control is assessed by the value of the average value of the functional determined on individual trajectories. Unknown control laws for the object model and the state observer are found in the form of expansions in terms of orthonormal systems of basic functions defined on the set of admissible states of the dynamic system. The problem of controlling a pencil of trajectories is reduced to the problem of parametric optimization, which is solved using a mini-batch adaptive random search method. A step-by-step algorithm for solving the problem is proposed, which is demonstrated by solving the problem of tracking various coordinates of a dynamical system according to the measurement results. The influence of the mini-batch size on the achieved tracking accuracy is investigated.
Stochastic identification of the “Object-attribute” table based on the modified Rabiner’s method
Authors: Shalagin S , Nurutdinova A
Published: June 2021

This article is about solving the problem of stochastic identification of the “Object-attribute” table based on subsets of stochastic ergodic matrices. The table has N rows and m columns. The identification is based on the implementation of the modified Rabiner’s method. We assume that the elements of m columns of the table are a discrete Markov chain of length N. The identification of each column is based on calculating the maximum probability that the Markov chain is generated based on the distribution law represented by one ergodic stochastic matrix from a given subset. An algorithm for solving this problem is proposed. Estimates of the time and hardware complexity of this algorithm, which are executed in parallel on a distributed computing system, are obtained. The dependence of the obtained estimates on the number of rows and columns of the identified table is determined. The value of N has a linear effect on the time complexity of an algorithm that implements MMR and is executed in parallel. A promising direction for future research is the distributed implementation of the proposed Algorithm.
The potential of the materials as the economic security’s factor of innovative projects
Authors: Bondarenko A , Burdina A
Published: June 2021

The purpose of the study is to reveal the specifics of assessing the potential of the material’s economic safety of the aviation product. The strategic directions of the aviation materials’ development and technologies of the Russian Federation have been studied. There was mentioned the necessity for analysis and assessment of the development level of the design base involved in the development and the creation of the aviation equipment at the enterprises: from the materials of the structural elements to the service support (for the purpose of import substitution). The article offers a categorical measure of the potential of the materials analysis. The scientific novelty of the research lies in the study of the economic safety of the product in the context of the elements: material, technical and technological, personnel, service and financial potential. As a result, a new meaningful interpretation of the concept of ‘economic safety of a product’ is given, an additive-multiplicative model for analyzing the level of the potential of the materials’development of an innovative project of the aviation industry is shown and an element of methodological tools for the assessing the level of the potential of the materials’development of a product is presented.
Millimetron microvibration analysis at low frequency range
Authors: Kravchunovsky A P
Published: June 2021

This paper presents the results of Millimetron microvibration analysis at low frequencies. Millimetron telescope structure behavior was studied in order to predict its central mirror response from microvibration disturbance caused by mechanical cryocoolers. The results contain the most significant values of acceleration which appeared on the mirror surface as well as rotational deflections which affect the telescope optical axis stability. To make it possible the microvibration analysis technique was derived from the theoretical aspects and other researches results. This technique was adapted to Millimetron microvibration analysis using its finite-element model and taking into account several assumptions which were also discussed at this paper.
Creation of a joint group and a decision support system to improve the after-sales support of civil aircraft
Authors: Zryachev S , Larin S
Published: June 2021

This work focuses on the problems of the existing approach to servicing Russian civil aircraft. The work aims to create a joint group for the analysis and processing of after-sales support flows, working together through the decision support system. The main difference from the current approach is the continuous joint work of all participants of the after-sales support, as well as the automated processing of the information received at all stages of the life cycles of aircraft. The work with a decision support system is presented as a work of joint group and operators through a decision support system. The presented methods and algorithms are the basis for increasing the competitiveness of Russian civil aircraft on the world market.
Accuracy of the short fibers reinforced composite material plasticity models
Authors: Kurkin E I , Spirina M O
Published: June 2021

Composite materials reinforced with short high-strength fibers are used in the aerospace industry, due to their high specific stiffness and strength. The anisotropic nonlinear nature of a short fiber reinforced composites requires the usage of anisotropic plasticity model of the material representative volume mechanical characteristics to predict the stress-strain state of the molded products. In this work, was made a comparison of three models of binder hardening – power, exponential and linear-exponential laws. The models were built in the Digimat MF system. The models describe tension of ISO 527-2 samples of 50% short glass-fiber reinforced polyamide PA6, cut out from plate at angles of 0°, 45° and 90° to the molding direction. The models parameters were identified by reverse engineering in the Digimat MX. The paper gives estimates of the accuracy of approximating the plasticity curve in each tension direction by the investigated models. The influence of the Mori Tanaka and the double inclusion homogenization schemes is investigated. It is shown that the exponential hardening law makes the best tension curve approximation with mean relative error less than 3.8% and maximum relative error less than 9.7%.
Improvement of the architecture of a universal robotic platform designed for swarm structures basis of small unmanned aerial vehicles
Authors: Pasechnikov I , Vospitanyuk A , Nazarov A , Rybakov D
Published: June 2021

The model of the landing system for swarms of small unmanned aerial vehicles in fact consists of a queuing system with a space-time holding zone serving as a gathering device for small unmanned aerial vehicles, where the holding elements are represented by the sequentially connected buffer zone for aerial vehicle landing and the landing line itself with a robotic landing platform. The passage of aerial vehicles from the holding area to the landing zone is controlled by the landing line access protocol. Safe movement of small unmanned aerial vehicles in the holding and landing zones is ensured by the information-measurement and management landing system of a universal robotic platform. The article suggests using the “landing system capacity” as one of the indicators of system performance efficiency.
UAV navigation using opto-electronic and inertial means in GNSS-denied environment
Authors: Savkin A , Antonov D , Kolganov L , Ryabinkin M , Chekhov E
Published: June 2021

The article presents an approach to improving navigation solution of unmanned aerial vehicle in GNSS-denied environment by means of optoelectronic and inertial measurements. An approach is based on locating and tracking keypoints on the underlying surface to correct inertial system errors. The approach is based on EKF-SLAM and can be applied both in the presence and in the absence of a terrain map. The simulation results of the optical-inertial navigation system readings are presented.
Compressed stiffened composite panels design with skin postbuckling behavior
Authors: Mitrofanov O V , Ryzhova E S
Published: June 2021

The aim of this paper is development of stiffened composite panels design method taking thin skin postbuckling behavior and stringers elastic behavior in case of longitudinal compression into account. Statement of the problem takes geometrically non-linear correlations into account. Variant of rigid boundary conditions is considered for both stiffened panels and skin. Analytic solution of non-linear problem using Ritz method which is reduced to solution of non-linear system of two equations in skin and stringer deflection amplitudes is shown. Obtained analytical solution is used for development of load-bearing panels design method based on postbuckling state. A design method based on thin skin postbuckling state not taking stringers influence into account is shown as an example. In this case following variants of strength criteria are considered: reaching longitudinal normal or tangential transverse critical stress. Besides stiffened composite panels design method taking skin postbuckling behavior in case of stringers elastic behavior into account is shown. With known stringer parameters design task is reduced to solution of non-linear system of two equations in skin thickness and stringer deflection amplitude. In this case stipulation of reaching critical normal stress in the skin is taken as strength criterion.
Molding gate optimization for weld line location away from structures loaded area
Authors: Kurkin E I , Lukyanov O E , Chertykovtseva V O , Espinosa Barcenas O U
Published: June 2021

Weld lines, generated during injection molding, can significantly reduce the mechanical performance of structures. The choosing optimal gate location technique has been developed to set weld lines as far as possible from the region of maximum stresses. A flat product case was considered as an example of a typical aircraft structural element – a pin-joint lug molding from short-fiber reinforced thermoplastic composite material. The Golden-Section search method allowed to solve the optimization problem. Autodesk Moldflow in batch mode controlled by Matlab code through Synergy API was used to solve the direct molding task of determination of the weld line location from gate location dependence. An experiment of the lugs injection molding from several gate positions was carry out to verify the numerical weld line prediction. The solved problem allows choosing the gate position for ensuring the weld lines location away from structures loaded area.
3-D Modelling and prototyping of complex-shaped heterogeneous parts
Authors: Pavlov V , Valkov V
Published: June 2021

This article provides a description and results of a study of the feasibility and applicability of encapsulation of various elements in parts of complex shapes, produced using 3-D printing and 3-D modelling. The relevance of this study is confirmed both by the general high rate of development of 3-D printing technologies in the world, and by the abundance of innovations in the application of these technologies, as well as by the specific features and needs of the specific production of optical sensor prototypes. This article describes the stages of the process and provides examples of encapsulated elements. A set of programs was used to create and modify gCode files in order to carry out the experimental part of the study. Experiments on the encapsulation of fasteners, insulating elements and elements of optical paths were successfully carried out in the course of the study in order to estimate feasibility of these encapsulation techniques. The objectives of the study have been achieved. The results or the research allows us to outline further ways of research, as well as to note the possibility of developing a single software package combining the functions of a slicer and gCode editor.
The reduction of computation load in SBAS system during the polynomial approximation of observations
Authors: Sernov V , Podkorytov A , Isaev Y
Published: June 2021

Processing of the observations from GNSS augmentation system on an example of SBAS system is considered in the study. To compute the corrections the SBAS control center collects and processes enormous amount of data, some of the applied matrix algorithms of estimation of the polynomial coefficients are computationally expensive. Instead of the estimation of the polynomial coefficients with the matrix operations the representation of polynomial value by means of a linear combination of previous observations is suggested in the study. Significant advantage in terms of computation time (up to 250 times) for cycle-slip detection procedure is demonstrated for presented method which is important for aviation because of strict integrity requirements in avia-space sector.
Principles of forming procedures for justifying the economic efficiency of space debris removal processes
Authors: Kaloshina M , Zemlyanskaya A
Published: June 2021

Near-Earth space pollution can be classified as an international problem. The research considers variation technical and technological innovative projects that can decide this problem, as well as methods for calculating the costs of their realization. Cost and labor intensity modeling takes into account the concept of designing systems for the disposal of cataloged space debris. Unitized approaches to technical and economic assessment of the feasibility of space debris disposal concepts are considered and a mechanism for justifying economic efficiency is developed, which includes the following synergistic differentiated principles: the objectivity and subjectivity, the accuracy and reliability increasing, the marginal cost estimation, the probabilistic risk assessment accounting, the principle of logical-probabilistic modeling of development obsolescence in outer space, the principle of risk assessment and monitoring of space projects. The proposed mechanism for evaluating the economic efficiency based on additive factors can be used for economic justification of scientific, technical and experimental-design developments of space vehicles for technological designated purpose.
Test technique for turbine cooled blades of gas turbine engines
Authors: Lepeshkin A , Remchukov S , Yaroslavtsev N , Guanghua Z , Meng Z , Fetisov M , Ilinskaya O , Fedin M , Kuleshov A
Published: June 2021

Test technique for turbine cooled blades of gas turbine engines is developed. The new approaches during development of inductor structures, induction heating devices, cooling systems, hydraulic force loading system and methods for their design to provide the prescribed nonuniform heating the turbine cooled blades and to carry out more effective the thermocyclic tests are presented taking into account the developed test technique. Study of effect of the clearances between inductor and blade surface and change of inductor efficiency on the thermal state of blade is presented. The test rig and improved systems of induction heating and mechanical loading are used to improve accuracy and simulate more complete the operating thermomechanical loading the full-scale cooled and uncooled blades at the thermocyclic tests. The results of rig testing the turbine cooled monocrystalline blades of gas turbine engine are received according to the developed test technique.
Students’ perspectives on 3D-vision
Authors: Krumphals Ingrid , Haagen-Schützenhöfer Claudia , Stradner Lisa
Published: June 2021

The perception of our surroundings is determined by vision to a large extent. Human vision is not only able to generate a three-dimensional impression of three-dimensional objects, but also of two-dimensional objects. Nowadays, 3D-technologies even provide additional opportunities to trigger visual 3D-perception. 3D-vision provides a context for teaching and learning several topics in physics. In order to develop a learning environment for high school students, following the framework of educational reconstruction, students’ perspectives must be considered. As we could not find any documented students’ conceptions on 3D-vision, an exploratory study was conducted. Main aim of this study was to provide a broad overview on students’ perspectives on 3D-vision. Therefore, the questionnaire mainly consisted of open questions. The questionnaire was administered to Austrian secondary level students of two schools and was finally filled in completely by 215 students. Data was analysed by the means of qualitative content analysis and an inductive category system was developed. The results show that students mainly connect 3D-vision with 3D-technologies in cinemas. However, differences between junior and senior high school students were detected. While junior high school students mainly associate 3D-vision with cinemas, senior high school students additionally mention the physiological process of 3D-vision as well as 3D-technology.
Analysis of some selected FCI tasks using eye-tracking
Authors: Krčmářová Anna , Chvátal Roman , Holubová Renata
Published: June 2021

In our contribution, we focus on the analysis of six FCI tasks which were solved by first-year university students. The analysis is conducted using eye-tracking data obtained from the experiment. Some characteristics, like attention maps and sequences of fixations provide a deeper insight into the students’ approaches to the tasks verifying their conceptual understanding to Newtonian mechanics. We can confirm that the students answering correctly were able to find the solution more straightforwardly, making their decision between fewer options. This is also supported by the analysis of fixation numbers and fixation times. The results show differences in the way novices and experts process questions. Moreover, it enables to identify some persistent misconceptions.
Physics education with multimedia applications in non-English teacher-oriented journals: an analysis of 491 articles about multimedia in physics education
Authors: Girwidz R , Thoms L J
Published: June 2021

Journals, intended for teachers, provide practical ideas about the use of multimedia in physics teaching and learning. However, the articles in such journals are usually written in local languages. Here, ten researchers in physics education from different countries provide a review of articles on multimedia applications and corresponding concepts that are discussed in country-specific languages (excluding English). A total of 491 articles about multimedia applications were analysed, using a list of 81 categories. Central topics included teaching strategies, technologies, and multimedia features. Furthermore, differences between countries, changes over time, and notable patterns of articles in 34 teacher-oriented journals from 10 countries are presented.

Current literature offers a broad range of ideas related to the practical use of multimedia. Topics of focus differ between countries and languages, suggesting more international exchange to circulate the best ideas of concrete teaching material for schools across Europe. Furthermore, our findings also suggest a need for improvement in the dissemination of current research findings, as well as a solid theoretical grounding among those who write articles for teacher-oriented journals in local languages.

This article collects and summarizes findings that may be relevant for the international group of scientists and for possible future collaborations.
Using frustrated internal reflection as an analog to quantum tunneling
Authors: Rossum Aernout Van , Berg Ed Van Den
Published: June 2021

Also in teaching quantum physics one would like to bring experiments to the secondary school classroom, if not for “proofing” theories, then at least for illustrating and visualizing concepts. When EM waves are totally internally reflected from the inside of a prism, so called evanescent waves can tunnel through a narrow slit to another prism [1] and the intensity shows the exponential dependence on the width of the slit typical for tunneling. This is an example for quantum tunneling as quantum particles can tunnel as well due to their wave properties. This paper describes our progress from an ineffective microwave tunneling demonstration which we tried out with 5 teachers and 112 students, to a well-known optical demonstration but newly mounted in a small for loan suitcase with an educational script based on our try-outs and the PhET tunneling applet to link quantum concepts to tunneling phenomena.
Teaching quantum physics as a structured physics theory in high school
Authors: Weissman Efraim Yehuda , Merzel Avraham , Katz Nadav , Galili Igal
Published: June 2021

This study presents a new approach to teaching quantum physics in high-school physics courses facing the extremely deficient and fragmented treatment of quantum mechanics at present. The suggested curriculum adopts the paradigm of discipline-culture in representing physics knowledge. In accordance, the curriculum is structured in nucleus-body-periphery emphasizing the principles (nucleus), their illustration (body) and their contrast with the classical postulates (periphery). Thus, the proposed curriculum presents quantum physics as a structured physics theory, unlike most curricula in the world. The results of an experimental application show a positive impact on students’ conceptual knowledge and students’ nature-of-science understanding.
A sequence of experiments and models to grasp the strange nature of light
Authors: Onorato Pasquale , Malgieri Massimiliano , Polesello Marta , Salmoiraghi Alessandro , Oss Stefano
Published: June 2021

We present a sequence of activities designed to stimulate students to reflect on the nature of light and on the different models (ray, wave, classical and quantum particles) used in teaching and learning optics. These activities are also aimed to help students in evaluating the profound meaning of the “correspondence principle” and develop their own views about some aspects of nature of science even if it is not taught explicitly. In fact, optics is a paradigmatic case where different scientific models are proposed in the University (and high school) courses. Even the oldest of these models have non empty domains of validity and both Maxwellian electromagnetism and geometrical optics are largely still used in the Physics curricula. As a consequence students are often puzzled, and think that each of these theories works in a specific domain, without any connection one with the other. Thus we investigate students’ mental models of light in different contexts and we show how they develop hybrid models in explaining different phenomena or use models inconsistently.
Conceptual Test in Wave Optics
Authors: Roskot Michal
Published: June 2021

The presented article deals with the Conceptual Test in Wave Optics. It describes main steps of its development and structure and properties of the final version. Two sets of pilotage testing have been done so far. In the first part of the research 105 high school students were tested with a test reliability described by Cronbach’s alpha on the level 0.2. Due to this low value another testing was carried out, this time with university students. It has showed reliability on the level 0.72. This article deals with results from the analysis of these two data sets and shows examples of possible wave optics misconceptions detected by this testing. The test is attached.
Workshop Demonstrations with almost nothing: Thirty examples with a glass of water
Authors: Berg Ed Van Den
Published: June 2021

Suppose you are suddenly assigned to a bare classroom instead of your nicely equipped physics room. What can you do to still have a clear and exciting lesson? In this workshop I present a collection of small and quick demonstrations and visualizations for secondary education, which require no equipment beyond what is present in a typical lecture room or bare classroom (chalk, chairs, students, books, paper, student bags and typical contents). The nature of the demos is varied, some are to verify an explanation, but most are to illustrate, visualize, or simulate. In the workshop participants will add their own ideas.
The Jumping Ring as an inquiry project: A learning-opportunities perspective
Authors: Langley Dorothy Vivienne , Arieli Rami
Published: June 2021

Incorporating authentic inquiry into high school physics instruction has been advocated for over a century, and has become an integral part of science instruction standards world-wide. The Inquiry Physics program in Israel is a 3 year, elective course for high school physics majors. Students acquire scientific research knowledge and skills primarily by performing inquiry projects of increasing complexity and finally devoting a full year to researching a significant issue under the guidance of expert mentors. Selecting a suitable research topic requires management of tensions related to complexity of content, experimental practice, data analysis and project logistics. The Jumping Ring phenomenon, in which a metal ring is launched vertically due to a magnetic force generated by a coil carrying AC current, was the subject of a final inquiry project in 2018. The phenomenon offers dramatic appeal and motivation, rich inquiry options and diverse experimental skills, considerable knowledge consolidation and extension (magnetic fields and forces, electromagnetic induction and AC circuits) along with technological and logistic manageability. Mentoring the project involved exploring an uncharted learning-opportunities’ path, balancing direct instruction and independent exploration, as well as dealing with time constraints and variations in the project team’s attendance and commitment.
Simulation of neutron background for a dark matter search experiment at JUSL
Authors: Banik S. , Kashyap V.K.S. , Ghosh S. , Dutta S. , Mohanty B. , Meghna K.K. , Bhattacharjee P. , Saha S.
Published: June 2021

Dark matter search experiments demand a low to ultralow radiation background to operate. It is very important to understand the nature of the radiation background including knowledge about the sources contributing to it. Sometimes, evaluation of the background becomes very specific to the site chosen for the experiment, and also to the experimental configuration. A dark matter search experiment is proposed to be set up at the Jaduguda Underground Science Laboratory (JUSL) in India. The laboratory will be located inside an existing mine with 555 m of vertical rock overburden. Neutrons produced from (α,n) reactions, spontaneous fission of natural radioactive impurities in the rocks, and also from cosmic muon-induced reactions are considered as the main background which can affect the sensitivity and outcome of the experiment. In this work, simulations based on GEANT4 are done to understand both the radiogenic neutron background caused by natural radioactivity of the surrounding rock and the cosmogenic neutron background due to interactions of the deeply penetrating cosmic muons with the rock material. The muon flux in the cavern is obtained to be 4.49(±0.25)×10-7 cm-2s-1 and the fluxes of radiogenic and cosmogenic neutrons above an energy threshold of 1 MeV in the cavern are obtained to be 5.75(±0.69)×10-6cm-2s-1 and 7.25(±0.40)× 10-9cm-2 s-1 respectively. The values obtained are comparable with estimates and measurements from DAMA, WIPP, and dark matter experiments at Boulby mine. The effectiveness of different shielding materials is also investigated to obtain the best possible neutron background reduction for a dark matter search experiment at JUSL. We also estimate the sensitivity of a CsI based detector for Weakly Interacting Massive Particle (WIMP) dark matter search at JUSL considering the estimated neutron background.
Implementation of The International Chamber of Ship Guidance For Ship Operators For The Safety of The Health Seafarers in The New Normal Age
Authors: Arleiny  , Soesatyo Y , Roesminingsih E
Published: June 2021

The impact of Covid-19 has threatened various aspects of life, including sailors. Various regulations have been issued to prevent the spread of Covid-19 on ships, such as Sea Transportation Circular Letter No: SE. 11 of 2020, Circular Letter No. 4202 / Add.4 International Chamber of Shipping (ICS), Circular Letter No. 4202 / Add.3 World Health Organization (WHO), and Circular Letter No. 202 / Add.2 WHO-IMO Joint Statement. The problems faced by seafarers with the existence of this regulation include the difficulty of ships entering the port, delays in issuing shipping approval lines and even the effects of these port entry restrictions or port closure causing crew changes to be prohibited. Based on the background of the problems mentioned above, The study aims at the introduction, in the new standard era and the solution to the problems of development of international Council of Ships Advice to Ship Safety Operators for Seafarers in the new standard era. In this article, the analysis methodology is the law. By reviewing all laws and regulations concerning legal matters being dealt with the legislative method shall be applied. The study is more oriented towards the approach of the legislation in relation to the introduction of the newly-formed norm era of the use of the international shipping chamber for marine operators. Data Analyse Techniques The approaches used during the analysis are qualitative analytical tools which start with specific hypotheses and certain paradigms as basis for initial findings. Data analysis techniques are deductive analytical tools. Health protocols issued both internationally and domestically are sufficient to become a standard for seafarers. The Ministry of Transportation has not made Standard Guidance for a crew change, resulting in long delays which can lead to high costs such as accommodation while waiting for results, double rapid tests, especially for crews whose mobilization places are far away.
Study on Blasting Construction Technology of Tunnel Engineering in Soil-rock Interlaced Strata at Soft and Hard Rock Boundary
Authors: Kong Lingqiang
Published: June 2021

With the development of transportation construction and the acceleration of urbanization in China, the construction of urban highway tunnel engineering has also entered a new climax. In order to overcome obstacles in terrain and elevation such as railway construction, blasting technology for railway tunnel construction is widely used. However, due to the unhealthy and complex geological conditions of railway tunnels, and the unreasonable application of blasting technology, blasting safety accidents occur. Blasting technology in railway tunnel construction, but blasting construction is easily interfered by various external interference factors. In the tunnel face blasting construction under the condition of soil-rock crisscross composite stratum, not only the physical and mechanical properties of the lower surrounding rock should be considered, but also the engineering characteristics of the upper surrounding rock or surface rock mass have great influence on the construction blasting. Taking the actual project as an example, this paper expounds the tunnel engineering and geological conditions, and studies the blasting construction technology of the tunnel engineering in the soft and hard rock boundary soil-rock crisscross strata to ensure the safety of blasting construction.
Analysis on Relay Coordination in IEEE 9 bus PV integrated Hybrid Power System using ETAP software: A case study
Authors: Mukherjee Subhajit , Mandal Ratan , Ganguly Arijit , Kumar Paul Asoke
Published: June 2021

The modern power system of the country like India, there is an important need to design an uninterrupted electrical power system network having adequate security, stability and reliability. In this present paper an IEEE 9-Bus hybrid system is considered for a short circuit analysis and protection relying coordination for designing of overcurrent relaying scheme to operate the relay efficiently and disconnect the fault section from healthy section instantly. It also compares the differences between existing systems with PV connected hybrid system. Now days, when Electrical Power System adopts the Renewable Energy source with existing power source of the network, the main challenge is to design a protection scheme to protect the hybrid system where different intermittent sources make a great impact. To design such a power system the behavior of the existing protection scheme need to be analyzed. In this paper authors simulate an IEEE 9-Bus system using ETAP simulation and analysis is made through Load Flow Study and Short Circuit Analysis. The study reveals that the behavior of the protection system changes with variation of the renewable energy sources integrated with in the bus system. Also set point of the protection relays varies with percentage sharing of the load by PV sources compared to the existing scheme. Observation of the behavior of existing protection system with PV connected hybrid system generates a road map to design an accurate protection scheme for hybrid system.
Renewable Energy Sources In Rajasthan For Sustainable Development
Authors: Paliwal Hemani , Dave Vikramaditya
Published: June 2021

Globally, energy consumption is increasing drastically due to the economic growth, rapid industrialization and increasing domestic comforts. Also energy is now considered to be important criteria for sustainable development of any country. Melting of ice caps, overabundance of greenhouse gases, global warming and other drastic climatic changes worldwide, has turned attention towards environmental issues. Exploiting the enormous potential of renewable energy sources could be one of the alternatives of total dependency on the conventional energy resources. In India, the population is sparsely scattered in vast geographic location, because of which the government often cannot provide electric power to the entire citizen through the centralized national grid. In that case, renewable energy is a good option to as it can be used as a stand-alone distributed generation system. In this paper, the availability and current status of renewable energy in Rajasthan is summarized. This summary of available resources helps researchers, investors and developers to find probability of improvement in technologies to harness renewable energy and to map out further expansion of renewable energy generation.
AI based Music Recommendation system using Deep Learning Algorithms
Authors: Anand R , Sabeenian R.S , Gurang Deepika , Kirthika R , Rubeena Shaik
Published: June 2021

The customized recommendation framework for music should accurately represent private tastes. To obtain tailored feedback for the needs of various viewers, it takes adjustments. To find the better deep learning model for the recommendation may pave a way for a better recommender. Compared to the previous era, with commercial music streaming sites that can be downloaded from mobile devices, digital music availability is currently plentiful. It takes a very long time to figure out all this digital music and induces data exhaustion. It may be helpful to create a music recommendation system that can automatically scan the music libraries and suggest appropriate songs to users. The music provider will anticipate and then give their customers the appropriate songs based on the characteristics of the music previously heard by using the music recommendation system. Our study would like to build a framework for music recommendations that can provide recommendations based on the similarity of audio signal features. This research uses the Convolutional Neural Network (CNN) and the Recurrent Neural Network (RNN). Customized recommendation system for music should effectively represent private preferences. To attain tailored recommendations for the demands of different listeners, it needs changes and therefore, attempting to find a better deep learning model for the recommendation will pave a way for a better recommender.
Automatic Social Distance Monitoring system using Deep Learning Algorithms
Authors: Shanthi T. , Anand R. , Hareesh K. , Jagan M.S. , Baskar V. , Bhanu Thanneru
Published: June 2021

In recent months, the worldwide outbreak of Corona Virus Disease (COVID-19) has created a panic situation for all human beings irrespective of the geographic location and economic status of the countries. The communal spread of the deadly virus can be prevented by maintaining the social distance between people and the wearing of face masks. This paper provides a prominent solution for monitoring using the Open-Source Computer Vision Library (Open-CV) and Deep Learning Algorithm to course people in public areas and to avoid crowding. This proposed project can be implemented using images taken from the Closed Circuit Television (CCTV). The distance between the people is detected with help of an object detection algorithm. The Euclidean distance is calculated and compared with the standard distance given. The persons with enough distance will be indicated in the green-colored bounding box and others with a red-colored bounding box. The total number of violations is also shown at the output feed. This project provides a solution to eradicate the spread of the deadly virus to an extent with minimum human effort and reduced risk of infection to the local athourities.
Development of a bi- directional multi- input- multi-output predictive model for the fused deposition modelling process using co-active adaptive neuro-fuzzy inference system
Authors: Dhar Ananda Rabi , Gupta Dhrubajyoti , Roy Shibendu Shekhar
Published: June 2021

In the automated manufacturing industries, modelling and prediction of the process parameters of additive manufacturing plays an important role. This paper proposes a computationally intelligent method using coactive-adaptive neuro-fuzzy inference system to establish relationships between the process parameters and the responses, in both forward and backward directions, for the fused deposition modelling process. Experimental data have been statistically analyzed and regression equations have been generated to produce large training samples. The model has been built using six inputs each with non-linear Gaussian membership function distributions, and three responses, each with linear membership function distributions for the forward-directed mapping. Similarly, three inputs and six outputs from the same training data set have been used to formulate the backward-directed inference model. The parametric study for the used back propagation algorithm has been conducted and validation has been accomplished with the optimal settings using actual experimental data.
Study and development of searching casualty and detecting fire by rescue robot
Authors: Yadav Sandeep , Raghuvanshi Rituraj , Bhadviya Avi , Sonare Rahul , Paliwal Satyam , Kashiv Vikas
Published: June 2021

The project titled study and development of searching casualty and detection of fire by rescue robot is associated with new equipment to complete the task and to respond in hazards situation. Search and rescue robots are developed for a certain purpose that humans can’t perform. Our objective is to design, construct, and develop a robot to use in emergencies that will be able to perform the seek and salvage operation. Fallen structures are the shakiest spot to perform search and salvage mission by human where the weight and size restricts the rescuer developments. The robot is designed to find injured victims and trash life, create a map of the disaster area, and collect the necessary information by digging and supporting robots to the data centre.
Horizontal axis wind turbines passive flow control methods: a review
Authors: Manerikar Sudhanshu S. , Damkale Sourabh R. , Havaldar Sanjay N. , Kulkarni Shubhanga V , Keskar Yash A.
Published: June 2021

In improving wind turbine torque and power output, the aerodynamic characteristics of wind turbines blades play an important role. Unleashing easy but efficient flow enhancement techniques over aerofoil sections used in horizontal axis wind turbines (HAWT) has become essential in the increasing demand for this source of renewable energy. These techniques or methods are primarily categorized into two kinds: active and passive. Active methods of flow control need energy expensewhereas passive flow control methods are needless of auxiliarypower. This paper investigates various passive flow control strategies that have great potential to boost the aerodynamics of blades of HAWT. The mechanisms and working principles, along with the findings from various experimental studies and CFD results for passive flow control systems are included in this article. Also, some of these studies are supported by demonstrating the lift and coefficient of drag (CD) variation with the angle of attack (AoA). The review suggests simple, cost-effective ways of improving lift and controlling the aerofoil stalling behaviors to obtain higher power efficiency for HAWT.
Investigation on dynamic behaviour of shape memory alloy (SMA) wire embedded composite
Authors: Patil Ranjit A. , Rane Santosh B , Kumbhar Samir B
Published: June 2021

Smart Material are responsive and intelligent materials. Shape memory alloy (SMA) are subset of a broad class of smart material. The functionalities arise from their underlying microstructural changes when subjected to external non-mechanical stimuli like temperature or magnetic field changes. The study of SMA uses and applications has been done because recently use of shape memory alloy used in the field of the automobile, robotics, medical, Aerospace, Biomedical domain etc. Shape memory alloy can be used for an actuator, sensor, stiffness changer, and damper. The extensive literature survey has been conducted to explore the potential and research scope in this project. This research will help industry to use SMA embedded composite for vibration isolation and damping.
Experimental and comparative analysis of zirconium oxide and fly ash reinforced with heat treated Al 7075 aluminum alloy hybrid
Authors: Mishra P.M. , Tripathi Ajay , Soni Sanjay
Published: June 2021

Aluminum Hybrid Composites are the new generation of metal composites that meet the latest requirements in advanced engineering applications. The mechanical proper- ties of these requirements, the ability to use traditional processing techniques, and the possibility of reducing costs of aluminum hybrid components production are all fulfilled. Aluminum alloy 7075 is an alloy with zinc as a primary alloying element. It is strong, with a strength comparable to many plates of steel, and has good fatigue strength and it has advanced properties like lightweight, corrosion resistance, high thermal conductivities, good mechanical properties, better wear resistance, low coefficient of thermal expansion as compared to the other conventional materials. Nowadays, Aluminum hybrid composites materials are more superior and demanding metal due to their The application of these metals is that is widely used in the field of Aerospace, Marine, & Minerals processing industries and many other industries due to their wonderful mechanical properties. AL 7075 one of the most superior grades of the Aluminum alloy to fabricating the single and hybrid composites materials. The stir casting method is extensively used to manufacture or fabricate composites materials.
Experimental testing of 3D printed polymeric heat exchangers
Authors: Fontana L , Minetola P , Calignano F , Iuliano L , Khandpur M S , Stiuso V
Published: June 2021

Unlike conventional manufacturing technologies, additive manufacturing and 3D printing empower engineers with much more design freedom. Heat exchangers with complex internal channels or lattice structures can be designed for layerwise manufacturing by maximizing the surface to volume ratio. Low-weight polymeric heat exchangers are employed in aviation and aerospace applications. For increasing the thermal performance of polymers, additives can be used such as graphene. In this study, a Grafylon filament is used for the production of a simple heat exchanger by 3D printing. The heat exchanger is composed of two external shells and an interior duct with a two-stage 45-degree bend. For watertight purposes, the duct is manufactured by selective laser sintering of polyamide powder. Two replicas of the shells are fabricated by 3D printing of Grafylon and acrylonitrile butadiene styrene (ABS) respectively. The thermal performance of the two materials is experimentally tested and compared also to numerical simulations. The results of the study show that the Grafylon filament provides enhanced thermal performance to 3D printed heat exchangers of polymeric material.
Development of ecosystem for effective supply chains in 3D printing industry - an ISM approach
Authors: Singh S , Agrawal V
Published: June 2021

3D printing (3DP) is an important technology to manufacture the objects of intricate designs that are otherwise not possible for traditional manufacturing. This technology has witnessed growth in research papers in the last decade that shows the increasing interest of researchers and users in this technology. Many researchers have predicted and written about the unimaginable new supply chain configurations after the large-scale adoption of 3D printing. A supply chain is a lifeline for any business because it drives the business by satisfying customers’ demands economically. This study was undertaken to explore the factors that are critical for developing a supply chain ecosystem for the 3DP industry. The study used the literature of the relevant research papers, conference articles, additive manufacturing business reports, and supply chain management (SCM)research papers & articles on 3D printing technology. This study highlights factors that are critical for the supply chain ecosystem for the 3DP industry. Interpretive Structural Modelling (ISM) methodology identified interactive association among those factors. Impact Matrix Cross-Reference Multiplication Applied to a Classification (MICMAC analysis) has classified those factors into four categories for better understanding and strategy making. The stakeholders in the 3D printing industry can draw insights from the output of this study. Researchers can do further research on these factors for the benefit of sustainable supply chains in the 3DP industry.
Comparative study of pressure variations in water distribution network due to change in location of elevated service reservoir
Authors: Thumma Arun Reddy , Aravindan A
Published: June 2021

This paper compares the pressure variations in a water distribution system due to a change in the location of an elevated service reservoir with an intermittent type of supply for a continuously increasing demand. For this study Water Gems connect edition software is used for the design of a water distribution network. This study is conducted in the Eturnagaram habitation of Mulugu district. The Water Distribution Network is designed for 30 years with PVC as pipe material and intermittent type of supply. Further, this water distribution system is analyzed for pipe bursts and proposes a framework for the operation and maintenance of the water distribution network.