bluuebunny/crossref_metadata_2025 huggingface dataset:
The Application of Mentimeter to Improve Critical Thinking Skills in Al Islam dan Muhammadiyah (AIK) Course
Authors: Risdiani Risdiani , Srifariyati Srifariyati , Raharjo Raharjo , Rohman Abdul
Published: April 2024

Recent learning processes have not been fully student-cantered. The assessment tends to only giving score and ignores the skill of critical thinking. It requires changes in the use of learning strategies, methods, and media that activate students in the learning process in order to develop the skill of critical thinking. In this case, the use of Mentimeter can be an alternative. The objectives of the research is to find out the application of Mentimeter in the course of Al Islam and Muhammadiyah in the material of Ramadhan Fast, and to know how Mentimeter media can improve critical thinking skill of Nursing Department Students of Universitas Muhammadiyah Pekajangan Pekalongan that consist as 32 students of class A as experiment class and 34 students of class B as the control class.  This study uses a quantitative research approach, specifically using a quasi-experimental method, the research design is pre-test, and the design of the control group is post-test. Based on the prerequisite test these two groups are not homogeneous and not normally distributed. From the results of research using the Mann Whiteney test, it is known that the Asymp. Sig. (2-tailed) of 0.00 0 which is less than 0.05. So, according to the basis for making a decision on the Mann Whitney U test, it can be concluded that Ho is rejected and Ha is accepted. This shows that there are significant differences in learning outcomes in the experimental class and the control class. The findings from this study indicate that Mentimeter media can effectively improve critical thinking skills.
Implementation of Articulate Storyline to Improve Students’ Interest in Learning Islamic History Lesson
Authors: Khozin Khozin , Haris Abdul , Rozza Dian Silvia
Published: April 2024

Inadequate educational ability shown by educators and resources as well as the limited time is the factor that causes inadequate student’s understanding. One of the approaches to decrease the problem involves the use of various instructional resources.  The objective of this research is to analyze the design of media with clear storyline and characteristics that determine the level of students’ interest in their education. This research uses qualitative approach with case study. Observation, interview, and documentation are the main method used in the process of data collection. Before, in the middle of, and after learning experience with media, observations were done. Text books and media made in Articulate Storyline are the documentation used. To analyze the data, first, the data must be summarized, then presented, and last, concluded  Based on the finding of the research, the most basic step to be done in the process of the making of the media is examining the concept and the design of the media end-to end. It is done in order to make Articulate Narrative media in the lecture of Islamic History as easy as possible. Besides that, the design must be modified to accommodate various demands and students’ ways of study. There are internal and external factors that play roles in determining the level of a student’s learning interest. The use of Articulate Storyline, which is an innovative learning media, is an example of an extrinsic element which has potential to help students develop their learning interest.
The Role of Muhammadiyah Organizations for Social Pathology in Makassar City
Authors: Risfaisal Risfaisal , Muslimin Abdul Azis
Published: April 2024

The Industrial Revolution 4.0 in the current era of modernization, has resulted in diverse social impacts, both positive and negative. The negative impacts involve the emergence of various social pathologies or societal issues related to culture. The purpose of this research is to understand the role of the Muhammadiyah Community Organization in addressing the most common social pathological behavioral issues in the city of Makassar. This research uses a qualitative method with a phenomenological approach in Makassar city, involving the leaders of Muhammadiyah branches, Muhammadiyah youth cadres, and the local community as informants. Primary and secondary data are used as types and sources of data. Data collection is conducted through interviews, observations, and documentation. Data analysis involves data reduction, data presentation, and verification, using source triangulation, time triangulation, and technique triangulation to ensure data validity. The research shows that social pathologies continue to occur in the community of Makassar due to the complexity of the heterogeneous society. The Muhammadiyah organization plays a significant role in reducing cases of social pathology in line with their vision and mission as an Islamic movement. This movement also provides ethical, moral, and akhlakul karimah (virtuous character) guidelines in the social order of the community. Therefore, the Muhammadiyah social movement and preaching play a significant role in disseminating modern Islamic teachings that can be accepted by the people and residents of Makassar city.
Integration of the Values of Surah Al Maun with the STEM Approach as a Learning Model for Muhammadiyah Schools
Authors: Nurhadi Rofiq , Fatmaryanti Siska Desy , Sert Hüseyin Emin , Wahyudi Jarot
Published: April 2024

Developing learning models that are in line with technological advances can build student values and character through the integration of Al-Quran values. One of the surahs in the Al-Quran is surah Al Ma'un, which is strong in instilling social attitudes or concern for the social environment and is the main basis for the Muhammadiyah movement. This research aims to produce a science learning model using a STEM approach containing Al Ma'un and determine the effectiveness of the STEM approach with Al Ma'un as a learning model in improving students' scientific attitudes and social awareness in Muhammadiyah schools. This research is a development research using the Plomp model. The research is conducted at 3 Muhammadiyah Middle Schools in Purworejo Regency. The feasibility of the learning model is carried out by expert validation in terms of syntax, social system, reaction principle, support system, and instructional impact. To test the effectiveness, it uses data on the percentage of pre- and post-observation results. The research results show that the learning model using the STEM approach containing Al Ma'un is valid and suitable for use. The effectiveness of the learning model is also high, based on the percentage increase in students' social awareness and scientific attitudes. This learning model can become an excellent learning model for Muhammadiyah schools. Apart from that, it can also be applied to Islamic schools in general for character development in aspects of social attitudes and social environment.
Integration between the Western and Islamic Parenting Models: Content Analysis in A Literature Review
Authors: Madyawati Lilis , Nurjannah Nurjannah , Che Mustafa Mazlina
Published: April 2024

Parenting as a child care practice has become the main focus in both Western psychology and Islam psychology. Each perspective is founded on different values and contributes to the development of the parenting concept. The concept of parenting from the Western psychology includes Montessori parenting, positive parenting, and religious parenting. Meanwhile, from the perspective of Islam psychology, the concept of parenting involves prophetic parenting, Islamic parenting, Qur’anic parenting, and fathanah parenting. The researcher conducted a literature review on these concepts by collecting papers using search engines, including Google, Publish or Perish, and Open Knowledge Map and collected scientific journal articles that are nationally and internationally accredited. A total of 58 journal articles published between 2013 and 2023 were found. Data sampling is adjusted to the research topic, namely the concept of parenting and early childhood parenting. Next, the researcher will interpret the meaning of each journal article using content analysis to identify the basic argument of the research. The findings show that the development of the parenting concept in the Western psychology perspective stems from phenomena in parenting, especially the religion phenomenon in parenting culture in the 21st century. On the other hand, the development of the parenting concept in the Islam psychology perspective is merely a conceptual reinterpretation that is centered in the values of al-Qur’an and hadith. Nevertheless, the researcher found two patterns in the development of the parenting concept in Islam: first, the development of the parenting conceptual framework that is integrated with interpretation method on al-Qur’an texts to explain the notion of parenting, and second, the theoretical integration between the parenting concept that is in accordance with al-Qur’an and hadith and the Western psychology’s notion on parenting. Based on the literature review, the integration between the parenting concept in Western psychology perspective and that in Islam results in the SMART parenting model which prioritizes joy, education, moral and religion, and health for the children’s growth.
Need Analysis for Teacher Performance Evaluation: Systematic Literature Review
Authors: Usman Errina , Hakim Irwanto Moch. Surya , Zainiyati Husniyatus Salamah , Suryani Suryani
Published: April 2024

One of recent educational problems is in the evaluation of teacher performance. It is revealed that the practices of teacher performance evaluation are manual, intuitive, and less objective. It causes the evaluation of teachers’ performance has not been maximum.  This inability to carry out teacher performance evaluation must be analyzed in order to minimize evaluation practices that do not comply with procedures, so as to produce maximum assessments as material for sustainable evaluation. The aim of this research is to analyze the needs for teacher performance assessment practices in Indonesia. This research uses a qualitative approach of the systematic literature review (SLR) type. The tools used to compile literature are Publish and Perish and Google Scholar. The codification results find 25 articles about teacher performance evaluation. The codified articles are limited from 2018 -2022. The research results show that the most urgent need analysis is the requirement for teacher performance evaluation to determine the teacher's ability to do their responsibilities and to provide warnings and motivation to teachers. Good teachers are supported by the competence of good school principals as mentors, coaches, and developers in school progress.
Educational Dualism in Indonesia: Systematic Literatur Review
Authors: Hidayati Nurul , Muhid Abdul , Sahri Iksan Kamil
Published: April 2024

Dualism in education is an interesting topic to discuss. Two entities separated as a result of this educational dualism are not easy to be united. However, this situation has happened, and what we have to do is finding the solution to anticipate the effects of the dualism. This article uses SLR method, which aims to summarize researches that have been done on history, effects, and solution of educational dualism in Indonesia. In this Systematic Literature Review (SLR) we collect, synthesize, and analyse research articles on educational dualism in Indonesia published between 2013 and 2023. The result of the research is that educational dualism in Indonesia is caused by several respects. First, this dualism is started from the policy of the Dutch Colonial Government in the pre-independence era. Second, the dualism is inherited and rooted up to now. Third, there is a political factor in the Indonesian government. Fourth, government policies that is considered weakening and alienating madrasah education (Islam), Fifth, the narrowness of scientific studies in Islamic education.   Meanwhile, the impacts of this dualism are that there is a dichotomy in knowledge, the cost of education is unaffordable for the lower middle class, curriculum development is increasing but religious, cultural and social values are experiencing a decline, and the world of education is becoming a political playing ground. To reduce the impact of the educational dualism above, several solutions are offered: one, eliminating scientific dichotomies; two, awakening the Islamic scientific ethos and scientific integration; three, changes in government policy.
Neuropsychological Intervention Using an Islamic Religious Approach to Prevent Bullying: Case Study at Madrasah Aliyah Mu'allimaat Muhammadiyah Yogyakarta
Authors: Us'an Us'an , Suyadi Suyadi , Siraj Saedah Binti
Published: April 2024

Bullying cases continuously spread in educational institutions so that they affect student physical and psychological development and even give the institution reputation bad name. Madrasah Mu’allimaat Muhammadiyah Yogyakarta, on the other hand, is able to decrease the number of bullying cases. The objective of this research is to theorize bullying preventing practices in Madrasah Muallimaat Muhammadiyah Yogyakarta. The approach of this research is descriptive qualitative. The informants of the research are the head of the madrasah, teachers, and students. The data collection methods are observation, interview, interpretation, and documentation. The data analyses are done with description, categorization, interpretation, and theorization. The result of the research shows that bullying preventing practices are done by combining psychological approach, neuroscience, and Islamic learning. The practices are then theorized into neuropsychology. Neuropsychology learns the relationship between brain and behavior, studies various functions including knowledge, skills in managing emotions focusing on empowering individuals. Neuropsychological interventions done at Madrasah Muallimaat Yogyakarta are: (1) Self-control through guidance, (2) Self-control through fasting habitation, (3) Self-control through collaboration and the values of friendship, (4) Self-control through religious activities (5) Self-control through empathy among students, and (6) self-control through patience and discipline. Theoretical configuration of the neuro-psycholgical intervention can be a model for the next research on bullying prevention in other Islamic educational institutions.
Responsive-Anticipative Coalition-building Method in The Policy of Integration Between Diniyah Takmiliyah and Formal Elementary School Education Institutions in East Jawa
Authors: Rahman Moh. Rifqi , Fuad Ah. Zakki , Zuhri Achmad Muhibin
Published: April 2024

The lack of communication between the education office and the ministry of religion in the implementation of Diniyah Takmiliyah education which has led to the emergence of new Diniyah Takmiliyah institutions, resulting in overlapping, and the low participation of parents in involving their children in Diniyah Takmiliyah education are some of the problems in the implementation of the Diniyah Takmiliyah integration policy with formal educational institutions. The objective of this research is to analyze and formulate the way of regency government in building the coalition with the executive parties of the policies of Diniyah Takmiliyah integration with formal educational institution in Sumenep and Pasuruan Regency and in building coalitions that lead to communication strategies so that research results can describe solutions to existing problems. This research is qualitative research with an institutional approach and an actor approach. The data collection technique used is document review, observation, and interviews, while the data analysis is done through several stages: data reduction, data presentation, and conclusions. The research results show that the method of building coalitions can be done in two ways. They are anticipatory and responsive. The findings of these two strategies are discussed further in the research. Furthermore, this research recommends effectiveness or factorial analysis to provide validation of the findings of this research.
Exploring Interfaith Connections at Sobi Hill, Ilorin, Nigeria: A Comprehensive Investigation
Authors: Ogunbiyi Olatunde Oyewole , Fahm Abdulgafar Olawale , Akande Lydia Bosede
Published: April 2024

This study delves into the interfaith dynamics at Sobi Hill, Ilorin, Nigeria, a communal holy natural place interwoven with Islam and Christianity. Using a qualitative case study approach with interviews, observations, and document analysis, the research explores Sobi Hill as a shared ground for spiritual practices, facilitating interfaith encounters and dialogue. The hill serves as a backdrop for rituals like prayer, pilgrimage, and tourism, promoting mutual understanding among practitioners of different faiths. Positive interfaith experiences are highlighted as contributors to peaceful coexistence and social cohesion. However, the investigation reveals challenges faced by such places, including conflicting beliefs, environmental degradation, and inadequate management. The study advocates for sustainable management practices recognizing the cultural and religious significance of these sites, emphasizing their preservation for future generations. In conclusion, the research provides insights into the interfaith connections at Sobi Hill and addresses broader challenges confronting communal holy natural places. The findings underscore the importance of fostering harmonious coexistence among diverse faith communities and advocate for effective management strategies to safeguard these sacred sites for cultural, religious, and environmental sustainability.
Ppsychological resistance as a component of the professional integration of the personality in the conditions of modern challenges
Authors: Palamarchuk Olha , Haba Iryna
Published: April 2024

У статті досліджується критична роль психологічної стійкості у професійній інтеграції особистості в умовах сучасних викликів. Основна увага приділяється розумінню того, як психологічна стійкість впливає на професійну інтеграцію в непевні часи.
Глобальні виклики сучасності характеризуються розбіжностями, дисбалансом, зростаючими ризиками хаосу та загрозами загальній безпеці, що контрастує з потребою в інтеграції, зв'язках, узгодженості та порядку. В умовах економічної нестабільності, геополітичних конфліктів, значного стресу, інформаційного перевантаження, фізичної та розумової втоми, зміни способу життя професійна інтеграція набуває вирішального значення для забезпечення стабільності, самореалізації та психологічного благополуччя.
Професійна інтеграція - це процес, який об'єднує навички, знання, цінності та досвід людини для досягнення успіху в професійній діяльності. Вона пов'язана з професійним статусом, який відображає позицію людини в професійній структурі, впливає на її економічне становище та роль, яку вона відіграє в системі професійних відносин.
Сучасна професійна інтеграція виходить за межі конкретної професійної діяльності. Вона передбачає планування всього кар'єрного шляху фахівця, де психологічна стійкість є ключовим аспектом. Психологічна стійкість, що характеризується врівноваженістю та резистентністю, дозволяє особистості протистояти життєвим викликам, несприятливим обставинам, зберігати фізичне і психічне здоров'я та працездатність під час професійної інтеграції.
Energy-Mass and Thermoelectric Characteristics of the Current Convertor, Made on the Devices of Plasma Electric Power Industry
Authors: Onufrieva E. V. , Onufriev V. V.
Published: April 2024

In space power propulsion systems (SPPS) based on a low-voltage power source and high-voltage electric rocket thrusters, a current conversion system (CCS) is required. As one of the elements of promising high–temperature CCS, high-temperature plasma thermal emission valves (HPTV) of plasma electric power industry are considered – grid key elements (GKE) and high-voltage plasma thermal emission diodes (HVPTD). In the work, the modeling of the energy-mass characteristics of the CCS built on the GKE and HVPTD using heat pipes (HP) for cooling is carried out, the temperature conditions in which the minimum specific mass of the current converter is achieved are determined. The specific gravity values are determined. The results of the work can be used in the development of new high-temperature CCS space power propulsion systems for electrical power from tens to thousands of kilowatts.
Ring Silicates Cs4Tm2[Si4O12](OH)2 and Cs4(Tm,Tb)2[Si4O12](OH)2 As Merohedral Twins
Authors: Bolotina N. B. , Topnikova A. P. , Belokoneva E. L. , Dimitrova O. V. , Volkov A. S. , Zorina L. V.
Published: April 2024

New ring silicates Cs4Tm2[Si4O12](OH)2 and Cs4(Tm,Tb)2[Si4O12](OH)2 have been synthesized by the hydrothermal method. A structural analogy is revealed between them and the previously studied silicates K4Sc2(OH)2(Si4O12) and K2Sc[Si2O6]F. Their crystal structures are identified as orthorhombic merohedral twins by the lost element of tetragonal symmetry. The structures of new ring silicates are related to those of fresnoite and tetragonal melilite.
RECURRENT RELATIONS IN GRAZING NONCOPLANAR X-RAY DIFFRACTION IN MULTILAYER SURFACE CRYSTAL STRUCTURES
Authors: Bushuev V. A. , Oreshko A. P.
Published: April 2024

The specular reflection of X rays from multilayer crystal structures on the surface of a single crystal under conditions of grazing noncoplanar diffraction is considered. Recurrent relations of a new type are obtained. A high sensitivity of the angular dependence of the specular reflection intensity in the diffraction region to the thickness and number of layers, their deformation, and degree of amorphization is shown.
Ultrasonic testing of butt joints in electrotechnical steel plates using Lamb waves
Authors: Vasil'ev A. V , Biryukov D. Yu , Zatsepin A. F
Published: April 2024

Using Lamb waves, the influence of the welding quality of thin steel sheets on the physical and mechanical properties of electrical steel has been studied. It is shown that Lamb waves excited in the zero symmetric mode are an effective source of information about the state of the material both in the welded joint of plates and in the region of the base metal not affected by thermal effects. Markers of quality of welded joints are determined. It has been established that the most informative parameters are the phase velocity of the Lamb wave and its amplitude. On the basis of velocity measurements, a macroscopic anisotropy of the acoustic properties of the material was found. It is assumed that the origin of this anisotropy is due to residual stresses that arise in the technological process of processing steel sheets. The results obtained are of interest for specialized quality control of butt welds in thin steel sheets.
Acoustic properties of aspen wood (Populus tremula),modified by ultrasonic method
Authors: Vjuginova A. A , Teplyakova A. V , Popkova E. S
Published: April 2024

Evaluation of the acoustic properties of objects using the obtained results as an informative parameter in determining the physical and mechanical characteristics of the material, as well as in the field of non-destructive testing, is widely used in modern science and technology. In the present paper the possibility of using this approach is considered in relation to the woodworking industry in order to estimate the characteristics of sawn timber modified by the ultrasonic method. The results of previous studies have shown the effectiveness of this technology for increasing the surface density and hardness of wood, therefore one of the urgent tasks is to find criteria that allow evaluating the achieved modification parameters, as well as optimizing the settings of the corresponding technological equipment.In this paper the research results of the acoustic properties of ultrasonic modified aspen wood (Populus Tremula) are represented and their applicability as a criterion for estimating the degree of modification for industrial wood blanks is revealed.
Magnetic properties of 09G2S steel, manufactured by selective laser melting and cyclically deformed by tension
Authors: Stashkov A. N , Nichipuruk A. P , Schapova E. A , Gordeev N. V , Vshivtsev I. V , Kazantseva N. V
Published: April 2024

Low-cycle fatigue tests in the elastic-plastic strain region of 09G2S steel specimens manufactured with a laser 3D printer by selective laser melting method (SLS steel) were carried out. The major hysteresis loops and field dependences of the reversible magnetic permeability were measured. It has been established that normalization at 980 °C (1 hour) reduces the ultimate strength of steel 09G2S in 2 times (502 MPa) and increases the relative elongation almost 6 times (34.6%), bringing this steel closer to cast steel 09G2S. The magnetic properties (Нс, Br, µmax) of cast and SLM normalized steel before and after cyclic tests are similar. The main changes in these properties of both cast and SLM steel are observed at the initial stage of low-cycle tests, a further increase in the number of cycles (up to the destruction of the tested samples) does not lead to their significant change. The nature of the change in the magnetoelastic field Hσ, determined from the experimental field dependences of the reversible magnetic permeability, during low-cycle tests for cast and SLM steels is radically different: for cast 09G2S steel the magnetoelastic field Hσ practically does not change with increasing number of cycles, whereas for SLM 09G2S steel a sharp increase of Hσ value by 30% is observed during the first test cycles, which is most likely associated with an increase in residual mechanical stresses.
Normalization of proton-radiographic images of objects with quasi-uniform areal density
Authors: Shilkin N. S , Mintsev V. B , Yuriev D. S , Kantsyrev A. V , Bogdanov A. V , Kolesnikov D. S , Golubev A. A
Published: April 2024

A technique of calculating the beam transmission through static objects with a quasi-uniform areal density using a single proton-radiographic image was developed under the condition of a gaussian-like transverse beam profile. The calculated transmission images are intended for the density reconstruction of the objects under study. A proton-radiographic investigation of static targets was carried out at the experimental facility with special magnetic optics PUMA at proton energy of 800 MeV and particle intensity 1010 per image. It has been shown that the use of the technique allows restoring the transmission of an object under study with an average relative error of about 1-1.2%.
Investigation of rolling bearing weak fault diagnosis based on cnn with two-dimensional image
Authors: Yu Zheng , Longtao Mu , Junhao Zhao
Published: April 2024

In this paper, we choose convolution neural network (CNN) as the method to diagnosis weak fault of rolling bearings. In order to improve the training effect of CNN, different two-dimensional image conversion algorithms which include Gramian angular sum difference fields, wavelet time-frequency diagram, Markov transition field are introduced in to convert one-dimensional time series of bearing vibration signals into images. To relieve the pressure of hardware calculation and shorten the time of training and validation, we use the piecewise aggregate approximation (PAA) to compress the data as much as possible while preserving the whole signal information. We add the batch normalization layer to avoid the gradient saturation problem of ReLU function and minibatch method is used to overcome the instability of stochastic gradient descent with momentum (SGDM) while designing CNN. Each kind of images are made as the training sample, and the results show that both the wavelet time-frequency diagram and the Gramian sum or difference angle field diagram can better identify the fault state, and the wavelet time-frequency diagram was relatively better. By comparing with different recurrent neural network (RNN) diagnosis models, the validity of the model was proved. At the same time, the model is applied to the performance degradation identification of fault parts, and the results shows that the model can effectively identify the degradation of inner ring, outer ring and rolling body, while the accuracy of inner ring and the outer ring is better. This paper provides a new idea for weak fault diagnosis of rolling bearings.
Taking into account the stiffness of steel ropes when evaluating their tension force based on the results of measuring the natural frequency of oscillations
Authors: Muratov K. R , Novikov V. F , Kulak S. M , Sokolov R. A , Safargaliev R. F , Musikhin S. A , Probotyuk V. V
Published: April 2024

The results of a previously performed inspection of steel ropes of a cable-stayed transition, where the tension force was determined by the frequencies of their transverse vibrations, are considered. The features of the technique for performing measurements of the natural frequencies of the rope oscillations are revealed, concerning the method of excitation of oscillations, their orientation and the volume of an informative sample of recorded frequencies. The physical model underlying the measurement technique does not take into account the elastic bending response of the rope and viscous friction. It is shown that taking into account such factors allows not only to improve the accuracy of measuring the tension force, but also opens up the possibility of detecting defects in the rope. For example, the breakage of the rope fibers, its thinning as a result of corrosion or abrasion leads to a decrease in flexural rigidity. A change in the state of the rope lubrication or the penetration of liquid into the rope leads to a change in the damping coefficient of its oscillations. The results of the study can be used to create monitoring systems for the state of steel ropes.
Ultrasonic inspection technology of welded joints obtained by spot friction welding
Authors: Borovkov A. I , Prokhorovich V. E , Bychenok V. A , Berkutov I. V , Alifanova I. E
Published: April 2024

Friction stir welding has found wide application in the aircraft and rocket industries, primarily due to the possibility of obtaining welded joints with a strength close to that of the base material. One of the most promising methods of such welding is friction stir spot welding, which can serve as an alternative to electric contact spot welding and riveting of joints. To introduce friction stir spot welding into the production of critical products, it is necessary to consider issues related to non-destructive quality control of welded joints obtained by this welding method. The purpose of this work is to substantiate the applicability of the ultrasonic echo method for quality control of welded joints obtained by friction stir spot welding. The relevance of the work is confirmed by the fact that today there is no sufficiently complete information on the results of experimental studies aimed at analyzing the characteristics of welded joints obtained by friction stir spot welding. The authors of the article proposed to use the ultrasonic echo method of control. The control was carried out using an ultrasonic flaw detector with a separate-combined piezoelectric transducer on samples of welds made using friction stir spot welding. Flaws such as lack of penetration and root sticking were found in three samples as a result of ultrasonic testing, which was confirmed by metallographic studies. Samples in which no defects were found were subjected to mechanical tests, as a result of which it was found that the strength of the obtained welded joints is comparable to the strength of the base metal of the samples. Metallographic studies were carried out on samples after the absence of defects in welded joints was confirmed through mechanical tests. Thus, the relationship between the results of ultrasonic testing, metallographic studies, and mechanical tests is shown, which makes it possible to justify the applicability of the ultrasonic echo method for quality control of welded joints obtained by friction stir spot welding.
Compressive thermal wave imaging for subsurface analysis
Authors: Pasha Md. M. , Ghali V. S , Vesala G. T , Suresh B.
Published: April 2024

Subsurface detail extraction in active thermography demands high capturing rates, resulting in less exposure time, data redundancy, large bandwidth requirement, and wastage of sensing resources and memory. Compressive sensing (CS) is a data acquisition technique that overcomes these limitations by acquiring the signal at sub-Nyquist rates with fewer measurements considering the signal is sparse in some transformed domains and reconstructing the original response. This paper validates the application of CS in frequency modulated thermal wave imaging by experimenting on a quick responsive mild steel specimen with artificially simulated back hole defects. The discrete cosine transform is selected as sparsity prior and the orthogonal matching pursuit is used to reconstruct the original thermal response from the compressed measurements. The initial analysis is carried out on choosing the optimal sparsity parameter and the number of measurements, followed by the effect of the number of measurements on defect detection in various post-processing techniques used in frequency modulated stimulus. The defects detected and their qualitative analysis through assessing signal-to-noise ratio confirmed the suitability of CS for efficient reconstruction of thermal data and thereby enhancing the defect signature.
Solution of the inverse problem definition surfaces at electron beam additive manufacturing
Authors: Trushnikov D. N , Krotova E. L , Starikov S. S , Musikhin N. A , Varushkin S. V , Matveev E. V
Published: April 2024

In this work, the inverse problem of surface restoration by the X-ray bremsstrahlung signal is posed in relation to the process of bead surfacing in additive manufacturing, and its solution is given using the iterative restoration method. Numerical implementation is carried out on the example of recovery of three types of symmetrical objects: Gaussian surface, hemisphere, cylinder. The comparison showed a good agreement between the reconstructed surfaces and the given ones.
Acoustic emission cluster analysis of composite laminates with different interfacial fiber orientations based on gaussian mixture model
Authors: Li Wei , Cheng Jiahao , Jiang Peng , Liu Yinghonglin
Published: April 2024

The present study aimed to find a method with higher efficiency to cluster acoustic emission events. The acoustic emission signals of composite laminates with different interfacial fiber orientations were captured during the Double cantilever beam (DCB) experiments. Through feature selection of the preprocessed data using the Relief F algorithm, it was found that most of the information in the acoustic emission signals can be represented by the amplitude, inverse frequency, center frequency, peak frequency and so on. Subsequently, principal component analysis and expectation-maximization and Gaussian mixture models were adopted to cluster the data with reduced dimensions. This method can not only distinguish among different damage mechanisms but also show the level of damage concentration according to their types. Furthermore, once the clusters were assigned to different damage mechanisms, they could be identified precisely using both the amplitude and peak frequency. Finally, based on the loading curves of the four types of specimens, the cumulative events and energies of the acoustic emission were compared and analyzed, and different damage mechanisms were identified.
Nondestructive evaluation by eddy current and ultrasonic technique of 475�C embrittlement effects in dss duplex stainless steels and corrosion behavior
Authors: Ghis R. , Hammouda A. , Ziouche A. , Boucherou N. , Choucha A. , Halimi R. , Benmoussat A.
Published: April 2024

In this paper, a non-destructive evaluation of the embrittlement effect in duplex stainless steel DSS 2205 aged from 5 h to 100 h at a temperature of 475 ° C was performed by Eddy current and ultrasonic techniques, in addition the corrosion behavior was carried out after heat treatment at 475°C. The experimental results show that an inverse behavior was observed between normalized impedance and hardness in aging time at 475°C; when the normalized impedance of the Eddy current probe was decreased, hardness was increased with aging time. The longitudinal ultrasonic velocity and transversal velocity were calculated in this study for each sample. The Young’s modulus and the Shear modulus were computed from the two velocities. The investigation carried out shows a sensitivity of Eddy current and ultrasonic technique to the microstructure changing observed at 475 ° C, due to embrittlement in duplex stainless steel. The effect of heat treatment at 475°C on the corrosion behavior was also evaluated by Eddy current on a long time and revealed the important changing in corrosion resistance due to spinodale decomposition of the ferrite phase.
Three-dimensional tomography of scattering inhomogeneities by a cylindrical multistatic probing system
Authors: Sukhanov D. Y , Khalil A.
Published: April 2024

A method of three-dimensional ultrasonic tomography based on multi-view probing with multiple emitters and multiple receivers on a cylindrical surface in a wide frequency band is proposed. Emitters and receivers are placed on a ring that moves along the vertical axis. Signal processing is based on the use of matched filtering and is reduced to the calculation of cyclic convolution along the angle and vertical axis, which makes it possible to implement a fast algorithm for recovering of three-dimensional images. To test the method, an experimental setup was developed consisting of 32 emitters and 64 receivers uniformly placed on a ring with a radius of 205 mm. During the experiments, sounding was carried out in air at frequencies from 38 kHz to 43 kHz. As a result, a three-dimensional object of a complex shape is visualized, which confirms the applicability of the proposed method.
Multiple damage prediction in tubular rectangular beam model using frequency response-based mode shape curvature with back-propagation neural network
Authors: Gupta Sonu Kumar , Das Surajit
Published: April 2024

In the civil infrastructure, the structures made up of tubular sections played an important role due to an economic point of view, lower self-weight, and stability against functional loads. The periodical maintenance or inspection of the structure is mandatory nowadays to achieve the potential utilization of the structural system. In this study, an experimental, numerical, and analytical study is carried out to investigate the structural fault and its severity in a tubular rectangular beam made up of structural steel. Modal parameters are extracted with the help of a dynamic data logger (B&K) by exciting an impact hammer on model structure and extracting a data with a set of unidirectional accelerometers. First, two displacement mode shapes are extracted using obtained modal parameters. The modal parameters are expected to contain environmental noise during experimentation, so, de-noising is must to obtain noise-free data. Artificial neural network training is utilized to reduce the noise from experimental modal parameters. Using the modified modal parameters, the mode shape curvature is obtained, and so-called modified mode shape curvature (MMSC) is used to calculate the curvature damage index. The curvature damage index is appropriate to investigate multiple fault locations with different fault levels in tubular rectangular beam structures.
Possibilities of manual eddy current testing for measuring the depth of contact-fatigue cracks of the surface of rolling rails
Authors: Shlyakhtenkov S. P , Nekrasov D. B , Palagin S. V , Bessonova O. V , Popkov A. A , Becher S. A
Published: April 2024

The possibility of using the eddy current method to assess the depth of cracks in the surface of rolling rails in operation for planning the work of a rail grinding train is investigated. Experimental studies of the influence of the excitation frequency and the angle of inclination of the eddy current converter, the state of the surface, the depth and angle of inclination of the surface crack on the amplitude and phase of the eddy current signal are carried out. The possibilities of the amplitude-phase method of detuning from interfering factors associated with the slope of the transducer and the curvature of the controlled surface are determined. The resolution of the flaw detector was investigated when evaluating the characteristics of two or more closely spaced cracks - a defect of the "grid" type of cracks. The depth of surface cracks in the range from 0.1 to 1.4 mm was determined by metallographic examination after eddy current control. Optimal control parameters have been experimentally substantiated and a correlation between the crack depth and the projection of the signal amplitude in the direction perpendicular to the direction of change of the interfering factor - the angle of inclination of the transducer - has been established.
Iterative reconstruction of images of aluminum casting taking into account prior information
Authors: Zolotarev C. A , Taruat A. T , Bilenko E. G
Published: April 2024

The problem of low-projection X-ray tomography is a typical representative of the class of ill-posed problems. A practical solution to this problem will expand the scope of the X-ray tomography method. The problem of low-projection X-ray tomography is often a problem with a lack of initial data and can only be solved using a priori information. To introduce the necessary additional information into the numerical algorithm, the methods of iterative reconstruction of tomographic images are the most suitable. One of the approaches for introducing this kind of information is described in this article.
Non-destructive testing of an aluminum alloy welded joint based on a mathematical model of the thermal welding process and computer microtomography
Authors: Syryamkin V. I , Khilchuk M. D , Klestov C. A
Published: April 2024

Strength control of welded joints is used in many industries. X-ray microtomography as a method of non-destructive testing allows not only to detect the presence of defects, but also to classify them and assess the size of cracks and non-crack-like defects (pores). This article discusses the non-destructive testing of welded joints of aluminum alloy 6061 T6 using computer micrototomography and a mathematical model of the thermal welding process implemented in ANSYS Workbench. Experimental results of the X-ray microtomograph are presented, and the size of defects in this sample is estimated. The mathematical model allowed us to obtain the thermal histories at which the faults were formed.
IR thermographic analysis of aperiodic energy entities in the atmosphere (tomsk phenomenon 17 years later)
Authors: Vavilov V. P
Published: April 2024

This study continues the investigation of 2006 intended for the analysis of aperiodic energy phenomena in the atmosphere by using the technique of infrared thermography. It is experimentally confirmed the existence of atmospheric energy entities of unknown nature in the zones subjected to prolong energy exposure. A spatial/temporal mathematical model of this phenomenon is proposed to match well the observed experimental data.
Ultrasonic tomography using sparse antenna arrays and frequency domain post-processing
Authors: Dolmatov D. O , Khairullin A. R , Smolyanskiy V. A
Published: April 2024

Currently, an important problem for industrial ultrasonic tomography using post-processing of matrix phased arrays signals is the improving restoration speed of results in the form of images of flaws in inspected objects. One of the approaches aimed at solving this issue is the application of sparse matrix antenna arrays. In this paper, we consider the use of the sparse matrix probes operating in a separate mode of signals acquisition together with the post-processing algorithm using the calculations in frequency-domain. Considered algorithm is based on the application of non-uniform fast Fourier transform. The efficiency of the considered approach is verified via in-situ experiments.
Acoustic and electromagnetic properties of a martensitic-aging ferro-nickel alloy with the addition of copper under mechanical tension
Authors: Murav'ev V. V , Murav'eva O. V , Vladykin A. L
Published: April 2024

The paper presents the results of a study of the effect of mechanical longitudinal uniaxial stretching on the velocity of longitudinal and transverse waves in XM-12 steel samples. During the research, an acoustic mirror-shadow method was used on multiple reflections of the control using an electromagnetic acoustic transducer and a piezoelectric transducer based on a polyvinylidene fluoride film to excite and receive waves. The elastic modules of the studied samples and the coefficients of acoustoelasticity are calculated.
Algorithms of hysteresis interference
Authors: Pavlyuchenko V. V , Doroshevich E. S
Published: April 2024

The calculated distribution of the electric voltage U at the output of the magnetic head (MG) scanning the magnetic carrier (MN) along the x coordinate is presented. The coordinates and amplitudes of the first maxima of hysteresis interference (HI) obtained in a pulsed magnetic field were found. Calculations with repeated use of the initial branch of the residual magnetization of the MN when constructing hysteresis interference are proposed. An analysis of the initial and hysteresis branches of signals for MH and other information carriers, signal converters and control systems has been carried out. The use of the obtained results allows to improve the quality of control of the properties of materials and objects.
Calculation of the magnetic field strength from a semi-infinite cylinder placed in an arbitrary external field
Authors: Dyakin V. V , Kudryaschova O. V , Raevskii V. Y
Published: April 2024

In the model of the semi-infinite cylinder the formulas and the corresponding algorithm for finding the magnetic field strength inside and outside the homogeneous cylinder placed in the external magnetic field of arbitrary configuration are deduced. Testing the results of calculations on these formulas for their correspondence with known physical laws, as well as on their coincidence with well-known analytical answers in the limiting private cases of the forms of magnetics were carried out.
The novel procedure of active thermal ndt: combining heating and forced cooling
Authors: Chulkov A. O , Vavilov V. P , Shagdyrov B. I , Kladov D. Yu. , Stasevskiy V. I
Published: April 2024

A novel technique of active thermal nondestructive testing is proposed. It involves consecutive heating and forced cooling of the surface of test objects. The results of numerical modeling and experiments have demonstrated efficiency of this technique in case of test materials, which are characterized by a high level of emission/absorption noise. Optimization of such test procedure requires correctly choosing power and turn-on time of forced cooling to stimulate increase of temperature contrast over defects at particular times. An additional advantage of forced cooling is decrease of a thermal load on test materials that may be important in case of composites.
Acoustic monitoring of steel production in the ladle-furnace unit
Authors: Martyugov A. S , Ershov E. V , Varfolomeev I. A , Bogachev D. V , Vinogradova L. N
Published: April 2024

A method of implementing acoustic control of the steel-making process in a ladle-furnace unit using a step-by-step acoustic event recognition model is proposed. The use of the developed model makes it possible to predict metal emissions with an accuracy of 96 %.