bluuebunny/crossref_metadata_2025 huggingface dataset:
Improved higher order adaptive sliding mode control for increased efficiency of grid connected hybrid systems
Authors: Nazir Masood Ibni , Ahmad Aijaz , Hussain Ikhlaq
Published: July 2021

This paper proposes a hybrid learning algorithm based super twisting sliding mode control (STSMC) of a hybrid wind/photovoltaic (PV) power system for grid connected applications. The gating pulses of the voltage source converter (VSC) are generated by employing adaptive reweighted zero attracting least mean square (RZA-LMS) algorithm. The control law acquiring the super-twisting algorithm generates a continuous and saturated control signal to regulate a hybrid system influenced by disturbances. The proposed control injects sinusoidal currents into the grid with low total harmonic distortion (THD) which improves the steady state & dynamic performance of the system by mitigating power system problems like harmonic injections besides giving satisfactory results under dynamic loading, varying wind speeds and solar insolation. It is a chattering free control which enhances the quality of disturbance rejection and sensitivity to parameter variation. It also caters to abnormal conditions like voltage distortions, DC link variations and reduces the latter by a factor of 80 V besides reducing switch stress by a factor of 5 V. This control exhibits robustness against model uncertainties and external disturbances. Also, the loss component is reduced which decreases the unmodelled losses. It also ensures efficient power flow between the grid, hybrid source and the load. The efficacy of the system is verified in MATLAB/Simulink. Improvements are also observed during dynamic conditions in terms of reduced fluctuations, steady state error and peak overshoot.
The crystal structure of 1,1′-(((2 (dimethylamino)ethyl)azanediyl)bis(methylene)) bis(naphthalen-2-olato-κ4
N,N′,O,O′)-(pyridine-2,6-dicarboxylato-N,O,O′)- titanium(IV) ─ dichloromethane (2/1), C33H29N3O6Ti
Authors: Zhao Tiankun , Wang Peng , Ji Mingyu , Li Shanjia , Yang Mingjun , Pu Xiuying
Published: July 2021

C33H29N3O6Ti, monoclinic, C2/c (no. 15), a = 27.4022(15) Å, b = 14.0345(7) Å, c = 17.0047(10) Å, β = 116.009(3)°, V = 5877.3(6) Å3, Z = 8, R

gt
(F) = 0.0369, wRref
(F
2) = 0.1125, T = 100(2) K.
The layered crystal structure of bis(theophyllinium) hexachloridostannate (IV), C14H18N8O8SnCl6
Authors: Reiss Guido J. , Wyshusek Maik
Published: July 2021

C14H18N8O8SnCl6, monoclinic, P21/n (no. 14), a = 8.1810(2) Å, b = 12.6195(3) Å, c = 11.3811(2) Å, β = 90.258(2)°, Z = 2, V = 1174.97(5) Å3, R
gt(F) = 0.0266, wR
ref = 0.0620, T = 290 K.
The crystal structure of 1-fluoro-4-(p-tolylethynyl)benzene, C15H11F
Authors: Liu Jin-Bao
Published: July 2021

C15H11F, monoclinic, P21/n (no. 14), a = 6.2490(3) Å, b = 7.6343(4) Å, c = 24.2376(9) Å, β = 90.914(4)°, V = 1156.15(9) Å3, Z = 4, R

gt
(F) = 0.0619, wR
ref(F
2) = 0.1829, T = 293(2) K.
Circumstances and Factors Associated With Falls Among Community-Dwelling Older Adults Diagnosed With Heart Disease Using the International Mobility in Aging Study (IMIAS)
Authors: Aburub Ala' S. , Phillips Susan P. , Curcio Carmen-Lucia , Guerra Ricardo Oliveira , Khalil Hanan , Auais Mohammad
Published: July 2021

Background and Purpose:

To identify the circumstances of falls and the factors associated with falls among older adults with cardiovascular disease (CVD).

Methods:

Baseline (2012) data from the International Mobility in Aging Study (IMIAS), a cross-sectional study, were used. Falling was measured by the subjective question, “Have you fallen in the last 12 months?” Several subjective questions were asked to obtain information about the circumstances of falls. Potential clinical factors associated with falling were cognitive status, depressive symptoms, physical performance, grip strength, visual acuity, and fear of falling (FOF). These clinical factors were measured respectively with the Leganes Cognitive Test, the Center for Epidemiological Studies Scales Depressive Symptoms, the Short Physical Performance Battery, a Jamar handgrip dynamometer, the Early Treatment Diabetic Retinopathy Study (ETDRS) tumbling E chart placed at 2 m, and the Falls Efficacy Scale-International. A χ2 test was used to determine whether there were significant differences in fall circumstances among older adults with and without CVD. Two-sample t tests were used to test for any significant differences between older adults with and without CVD. Bonferroni correction was applied to limit type I errors and was corrected to .007. Simple and multiple logistic regressions identified which clinical factors were associated with falling.

Results:

A total of 429 older adults with CVD (mean age 69.5 ± 2.9) and 431 older adults without CVD (69.2 ± 2.9) participated in the study. Approximately 53% of fallers with CVD had 2 or more falls compared with fallers without CVD (39%). The most common location for falling was at home (43%) for fallers with CVD or in the street (50%) for fallers without CVD. Approximately 9% of fallers with CVD needed to be hospitalized while only 3% of fallers without CVD were admitted to the hospital. Approximately 42% of fallers with CVD had some residual sequelae (eg, being unable to walk around the house or do housework) compared with only 27% of fallers without CVD. Fallers with CVD had significantly (P value < .007) more depressive symptoms (mean ± SD, 14.7 ± 12.9) and poorer physical performance (8.4 ± 3.0) compared with fallers without CVD (10.1 ± 9.4 and 9.6 ± 2.5, respectively); however FOF was the only significant clinical factor (P value < .05) associated with falling for older adults with CVD.

Conclusions:

Incidence of recurrent falls is higher among older adults with CVD than those without CVD. Circumstances of falls among fallers with CVD differ from those identified among fallers without CVD. Fear of falling was the only predictor of fall history among older adults with CVD. The results suggest the merit of considering FOF when designing prevention and intervention programs to reduce falls among older adults with CVD.
Pneumatologiczny wymiar Kościoła i teologii według Johna D. Zizioulasa
Authors:   Katolicki Uniwersytet Lubelski Jana Pawła II, Jagodziński Marek
Published: July 2021

John D. Zizioulas’ publications do not include a special study of his Pneumatology, but his lectures on dogmatic theology contain a lot of material on the pneumatological vision of the Church. The foundation of the Church’s faith is the revealed and communicated truth of God, the preservation of which is a special task of the Holy Spirit. He is always active in community and creates communion, and all His gifts are for unity. The truth is revealed and secured only in the communion of the Holy Spirit in the Church. Zizioulas writes that it is the Holy Spirit who constitutes the true “essence of the Church”. Hence, Orthodox theologians often conceive of the Church as “an everlasting Pentecost event”. Thanks to the Son, we can get to know God, while the Holy Spirit reveals that God is communion. The great mistake of generations of dogmatists was to separate Christology from the science of God – and therefore from pneumatology. Salvation is realized in the Church, which is after all God’s people united in Christ and in the Holy Spirit. The Holy Spirit is the Spirit of communion, and it is no exaggeration to identify the Kingdom of God with Himself. The Eucharist is communion and participation in the Blood of Christ, which is “full of the Holy Spirit” and shares in Christ – and at the same time “in the communion of the Holy Spirit”. In the face of christomonistic or charismatic constraints, Zizioulas reminds us that Christ does not build the Church without the Holy Spirit, and He does not come to the Church only when he is completely formed. The institution of the Church was established at a specifi c point in history, but is constantly constituted and renewed by the Holy Spirit. The Church receives everything from God through Christ in the Holy Spirit, but it is necessary to receive His gifts in the event of communion – and it is in the Holy Spirit that everything what happens is an event of communion.
Eklezjalny wymiar pełnienia charyzmatu proroctwa. Wciąż aktualne przedsoborowe intuicje Yves’a Congara
Authors:   Uniwersytet Kardynała Stefana Wyszyńskiego w Warszawie, Kasprzak Artur
Published: July 2021

This study examines the question of the elementary tools of discernment in the Church needed to guide the fulfilment of the prophet’s charism. The study considers the synthesis of Yves Congar’s important reflections in his book of 1950: True and False reform in the Church. The search of the French theologian refers to the analysis and finding the reasons for the division caused in the Church in the West by Martin Luther in the 16th century. We see behind Congar’s intuition that there is a risk of division in the prophetic quest to reform the Church. Only true reform in the Church can avoid it. However, an authentic reform must always be embedded in the right conditions of discernment. The issues raised by the eminent French theologian are important in terms of the dynamic pentecostalisation of Christianity, but also in the proper interpretation of the pastoral renewal directed by the current Pope Francis. The tools for discerning the authenticity of reform in the Church are still unchanged. Despite the 70 years that have passed since the publication of the book by Congar analysed here, his indicated conditions for assessing the authenticity of Church renewal are still valid.
Napięcie między subiektywnym a obiektywnym. Rozpoznanie działania Ducha Świętego w tradycji zachodniej i wschodniej
Authors:   Uniwersytet Śląski, Sawa Przemysław
Published: July 2021

Tension between personal experience and community discernment, a prophesy and Church’s teaching, judgement of conscience and trueness of moral doctrine is still alive. Ultimately, it is all about what in the Church is subjective and what is objective. This reconciled opposition is inscribed in the identity of Christianity. Evangelical testimony of disciples going to Jerusalem after encountering Jesus in Emmaus and theirs confrontation with Peter’s experience demonstrates a model of appropriate route: subjective does not transgress objective, personal it is in tone with ecclesiastical. Despite an agreement among Christians in terms of general direction, a diff erence at level of details between particular traditions is noticed. Without depreciating individual and discerned, Catholic Church invariably supports the necessity to acknowledge The Teaching Office of the Church and the power of bishops within diocese. Of course all faithful take part in carrying and development of the legacy, especially through testimony and creative dialogue. Synods, councils and other bodies serve an example. However they do not cover doctrinal and disciplinary issues. Formation, obedience and spiritual guidance are important at personal level. Recognition of bishop’s authority, adherence to the Tradition and cannons and obedience to spiritual guide (the elder) are key elements of Orthodox tradition. Special attention is given to conciliarity (synodality) on various levels of Church. On the other side, for the post-reformation communities the fundamental and practically the only rule is Sola Scriptura. Bible does not give answer to each particular question and does not describe every form of Holy Spirit’s action therefore different conclusions and options arise in various denominations. Undertaking the process of discernment itself, historical Churches follow more codified path of Church’s discernment such as synods, councils, conferences while evangelical communities accept even more individual approach, recommending of course pastoral prudence and consultations with pastor or elders of the congregation. It is especially necessary among Pentecostal Christians accepting the presence of charismatic gifts, to include prophecy.
Teologia jako wiedza praktyczna
Authors:   Uniwersytet Szczeciński, Sienkiewicz Edward
Published: July 2021

Regardless of the solutions to the problem posed in this way, at least one is beyond discussion: in the practical dimension of systematic reflection of faith, it is about knowledge. Besides, it is theology that is the most appropriate way to defend knowledge against one-sided and partial approaches. It is determined by two issues that constitute an interpretative key in solving the problem posed: sense and context, as well as – in this perspective – two dimensions: cognition and free will. Therefore, in order to define the nature and importance of theology as practical knowledge, the problem of utilitarianism in science as such must first be solved. The turning point here is the Marxist appreciation of revolutionary praxis, which gives philosophy a new and practical meaning. It posed a particular challenge to theology and the objective nature of truth as a fundamental question in science. Both the Bible and the Christian systematic reflection of faith developed over the centuries clearly show that faith in Almighty God has a practical character. This means that faith cannot be reduced to knowledge only, just as faith cannot give up the problem of truth. In this sense, theology as practical knowledge, that is, on the basis of faith, a specific spiritual attitude and the choices that flow from it, is a proper understanding of the necessary participation of human reason, revelation and life in this event. From a Christological perspective, the best definition of theology as practical knowledge are the words from John’s Gospel: “I am the way, the truth and the life” (Jn 14: 6). In such an approach, the practical dimension of reflection on faith is simply love – first as the perfect fulfillment of the Law (Rom 13:10), and then as caritas, that is, a gift that does not retreat from renunciation and suffering. This means the necessity in this problem of the revealed truth about the Holy Trinity, in which the relationships of giving and accepting in love are difficult to consider theoretically. Just as practical and theoretical knowledge should not be opposed, knowledge and wisdom should not be confronted or separated. For theology, as wisdom, not only knows, but also knows why it knows and what to do with what it knows; not only poses the question of how to live, but also answers them. In other words, the practical dimension of systematic reflection of faith is essential for theology to be not only debatable, but also kneeling and working.
Theologia perennis. O poznaniu teologicznym
Authors:   Uniwersytet Śląski, Szymik Jerzy
Published: July 2021

Faith, which, by its very nature, wants to know the One it loves, results in theology – a love-inspired rational reflection on its own content. Hence, it is the guarantee and the motive for the permanence of theology as a cognitive eff ort, humbly and courageously reaching the Mystery of God Himself, who is the first to be known as the truth to the one who seeks for love and to subject what they see to the judgement of reason. In confrontation with the contemporary concept of epistemology, which considers only mathematical and natural cognition to be scientifically practised, theology convinces about the limits of reason and the methodologically necessary role of living, ecclesiastical faith. Such instrumentarium ensures a unique synthesis of objectivity and subjectivity in the cognitive process – the knowledge of the truth about reality demands personal involvement. Theology, which in fact values human reason, allowing it to reach out to the reality of the highest rank – God Himself – appears to be a great opportunity for today’s mankind, plagued by spiritual and intellectual confusion.
The Utilization of Instructional Media by the Vocational High Schools Teacher
Authors: Dwihartanti Muslikhah , Sutirman Sutirman , Yuliansah Yuliansah
Published: July 2021

This study examines the use and development of instructional media by the teachers of Office Administration Vocational School (OAVS) in the Special Region of Yogyakarta (DIY). The population of this survey research is all teachers of OAVS in DIY. This research employed the purposive sampling technique and considered only the teachers who had been teaching productive subjects for at least five years. The descriptive analysis technique was used to conduct the data analysis. The result shows all the teachers of OAVS in DIY have utilized learning media in teaching and learning activities. The most widely used type of instructional media is the PowerPoint. The technical constraints experienced in utilizing learning media are related to the preparation of using learning media. While the non-technical are related to the availability of facilities and infrastructure. Teachers of OAVS in DIY who have developed learning media are still at a low level. Technical things experienced by teachers in developing learning media are constrained in the process of planning the development of learning media and should look for media experts who will validate. The non-technical constraints faced by teachers in media development are issues about facilities and low teacher motivation.
Investigating Virtual Learning on Students Learning Outcomes in Urban and Rural Areas
Authors: Hariyati Nunuk , Wagino Wagino , Mudjito Mudjito
Published: July 2021

This study aims to investigate the implementation of virtual learning on studentsâ€™ learning outcomes mediated by motivation and to compare its effectiveness between urban and rural areas. This study employed quantitative design, involved 362 students of Faculty of Education in UNESA. To determine the sample, it employed Solvinâ€™s formula. The data were collected by using three instruments, specifically Virtual Learning Effectiveness, Learning Outcomes, and Motivation. To see the difference of virtual learning on learning outcomes mediated by motivation based on studentâ€™s location, path analysis was performed twice by separating the data into two kinds of groups. The first group contains studentâ€™s data that lived in an urban area. The second group contains studentâ€™s data that lived in a rural area. The findings of this research confirm that the virtual learning is effective to improve studentsâ€™ learning outcomes which was mediated by motivation. In addition, it was found that the motivation of students from urban areas is higher than those from rural areas. It suggests that the native location of students influences their motivation.
Decision Model for Saving Stocks Based on TPB and Financial Literacy
Authors: Mulyono Kemal Budi
Published: July 2021

This study investigated the behavior of investment decisions that were not only assumed on rationality but were also affected by other factors, such as psychological factors, one of which was financial literacy. There were so many causal studies of financial literacy and investment intentions. However, there were still issues of inclusion between studies. Therefore, this study adopted a theory of planned behavior, proposed as an explanatory model for investment intentions associated with financial literacy. By proposing attitude, subjective norms, and perceived behavioral control related to investment as a mediator of investment intention, the unit of analysis was students who were members of the capital market study group spreading across universities in Semarang. The sample used was 170 students conducted through a questionnaire survey, then analyzed descriptive statistics and SEM with the PLST Warp. The results showed that all variables, both attitudes, subjective norms, perceptions of behavioral control, significantly mediated the effect of financial literacy on investment intention in partial mediation. For future research, you can explore the variables of financial education as early predictors associated with this research model to get a holistic picture related to the effectiveness of student financial education.
An Analysis of Student Engagement for Online Microeconomics Class Based on ELED
Authors: Melati Inaya Sari , Harnanik Harnanik
Published: July 2021

This study aims to analyze the factors affecting student engagement in Microeconomics online classes based on E-Learning Engagement Design (ELED). This study applied a mixed method with a sequential model. The study population included all students of the Department of Economics Education UNNES who took online courses in Microeconomics and Microeconomics 1, both regular and international classes, with a total of 320 students and 4 lecturers handled the classes. The results showed that situational interest, personal significance, mastery of self-talk and mastery of self-talk for performance had a positive effect on student engagement in Microeconomics online classes. Meanwhile, mastery of self-talk to avoid negativity, environmental control, independent consequences, and setting proximal goals do not significantly influence student engagement in Microeconomics online classes. The concept of E-Learning Engagement Design (ELED) has been applied to all components. However, it is necessary to standardize the learning environment components to make sure there is no gap among Microeconomics classes which leads to less optimal academic services.
Risk stratification in differentiated thyroid cancer with RAI-avid lung metastases
Authors: Ohkuwa Keiko , Sugino Kiminori , Nagahama Mitsuji , Kitagawa Wataru , Matsuzu Kenichi , Suzuki Akifumi , Tomoda Chisato , Hames Kiyomi , Akaishi Junko , Masaki Chie , Ito Koichi
Published: July 2021

Objective

Radioactive iodine (RAI) therapy is effective for differentiated thyroid cancer (DTC) patients with lung metastasis. However, some patients have a poor prognosis despite the RAI accumulation. The utility of inflammatory biomarkers, including neutrophil-to-lymphocyte ratio (NLR), has been reported as a prognostic factor for many carcinomas. This study aimed to investigate the risk factors related to DTC patient survival with RAI-avid lung metastasis and to attempt risk stratification.

Design and methods

This retrospective study included 123 patients with RAI-accumulating lung metastatic DTC. The cause-specific survival (CSS) rate from the time of detection of lung metastasis was tested using the Kaplan–Meier log-rank test, and the multivariate analysis was calculated using the Cox proportional hazards model. NLR was retrospectively calculated using the blood sample collected before initial RAI treatment. The NLR cutoff value was 2.6 on the ROC curve.

Results

Age ≥ 55 years at the time of operative treatment, follicular carcinoma, lung metastasis tumor ≥ 10 mm in diameter, age ≥ 55 years at the time of detection of lung metastasis, age ≥ 55 years at the time of RAI treatment, and NLR ≥ 2.6 at the initial RAI treatment were predictive of decreased CSS. Multivariate analysis identified that the independent prognostic factors were lung metastatic tumor ≥ 10 mm in diameter and NLR ≥ 2.6. Patients in the high-risk group with both factors had significantly lower CSS rates than those in the low- and intermediate-risk groups with one or none of these factors.

Conclusions

The high-risk group patients had significantly poorer survival, and these patients could be considered as future candidates for tyrosine kinase inhibitor therapy.
A New Illustrated History of the Book
Authors: Navickienė Aušra
Published: July 2021

THE OXFORD ILLUSTRATED HISTORY OF THE BOOK. EDITOR JAMES RAVEN. OXFORD UNIVERSITY PRESS, 2020. 480 P. ISBN 9780198702986. EBOOK ISBN 9780191007507.
Theoretical studies on rocket/space hardware aerogas dynamics
Authors:   Institute of Technical Mechanics of the National Academy of Sciences of Ukraine and the State Space Agency of Ukraine, Timoshenko V.I. , Halynskyi V.P. ,   Institute of Technical Mechanics of the National Academy of Sciences of Ukraine and the State Space Agency of Ukraine, Knyshenko Yu.V. ,   Institute of Technical Mechanics of the National Academy of Sciences of Ukraine and the State Space Agency of Ukraine
Published: July 2021

This paper presents the results of theoretical studies on rocket/space hardware aerogas dynamics obtained from 2016 to 2020 at the Department of Aerogas Dynamics and Technical Systems Dynamics of the Institute of Technical Mechanics of the National Academy of Sciences of Ukraine and the State Space Agency of Ukraine along the following lines: rocket aerodynamics, mathematical simulation of the aerogas thermodynamics of a supersonic ramjet vehicle, jet flows, and the hydraulic gas dynamics of low-thrust control jet engines. As to rocket aerodynamics, computational methods and programs (CMPs) were developed to calculate supersonic flow past finned rockets. The chief advantage of the CMPs developed is computational promptness and ease of adding wings and control and stabilization elements to rocket configurations. A mathematical simulation of the aerogas thermodynamics of a supersonic ramjet vehicle yielded new results, which made it possible to develop a prompt technique for a comprehensive calculation of ramjet duct flows and generalize it to 3D flow past a ramjet vehicle. Based on marching methods, CMPs were developed to simulate ramjet duct flows with account for flow past the airframe upstream of the air inlet, the effect of the combustion product jet on the airframe tail part, and its interaction with a disturbed incident flow. The CMPs developed were recommended for use at the preliminary stage of ramjet component shape selection. For jet flows, CMPs were developed for the marching calculation of turbulent jets of rocket engine combustion products with water injection into the jet body. This made it possible to elucidate the basic mechanisms of the effect of water injection, jet–air mixing, and high-temperature rocket engine jet afterburning in atmospheric oxygen on the flow pattern and the thermogas dynamic and thermalphysic jet parameters. CMPs were developed to simulate the operation of liquid-propellant low-thrust engine systems. They were used in supporting the development and ground firing tryout of Yuzhnoye State Design Office’s radically new system of control jet engines fed from the sustainer engine pipelines of the Cyclone-4M launch vehicle upper stage. The computed results made it possible to increase the informativity of firing test data in flight simulation. The CMPs developed were transferred to Yuzhnoye State Design Office for use in design calculations.
Gas flow control in rocket engines
Authors:   Institute of Technical Mechanics of the National Academy of Sciences of Ukraine and the State Space Agency of Ukraine, Strelnikov G.A. , Yhnatev A.D. ,   Institute of Technical Mechanics of the National Academy of Sciences of Ukraine and the State Space Agency of Ukraine, Pryadko N.S. ,   Institute of Technical Mechanics of the National Academy of Sciences of Ukraine and the State Space Agency of Ukraine, Vasyliv S.S. ,   Institute of Technical Mechanics of the National Academy of Sciences of Ukraine and the State Space Agency of Ukraine
Published: July 2021

In the new conditions of application of launch vehicle boosters, space tugs, etc., modern rocket engines often do not satisfy the current stringent requirements. This calls for fundamental research into processes in rocket engines for improving their efficiency. In this regard, for the past 5 years, the Department of Thermogas Dynamics of Power Plants of the Institute of Technical Mechanics of the National Academy of Sciences of Ukraine and the State Space Agency of Ukraine has conducted research on gas flow control in rocket engines to improve their efficiency and functionality. Mechanisms of flow perturbation in the nozzle of a rocket engine by liquid injection and a solid obstacle were investigated. A mathematical model of supersonic flow perturbation by local liquid injection was refined, and new solutions for increasing the energy release rate of the liquid were developed. A numerical simulation of a gas flow perturbed by a solid obstacle in the nozzle of a rocket engine made it possible to verify the known (mostly experimental) results and to reveal new perturbation features. In particular, a significant increase in the efficiency of flow perturbation by an obstacle in the transonic region was shown up, and some dependences involving the distribution of the perturbed pressure on the nozzle wall, which had been considered universal, were refined. The possibility of increasing the efficiency of use of the generator gas picked downstream of the turbine of a liquid-propellant rocket engine was investigated, and the advantages of a new scheme of gas injection into the supersonic part of the nozzle, which provides both nozzle wall cooling by the generator gas and the production of lateral control forces, were substantiated. A new concept of rocket engine thrust vector control was developed: a combination of a mechanical and a gas-dynamic system. It was shown that such a thrust vector control system allows one to increase the efficiency and reliability of the space rocket stage flight control system. A new liquid-propellant rocket engine scheme was developed to control both the thrust amount and the thrust vector direction in all planes of rocket stage flight stabilization. New approaches to the process organization in auxiliary elements of rocket engines on the basis of detonation propellant combustion were developed to increase the rocket engine performance.
Strength, reliability, and life of aerospace and power engineering structures
Authors:   Institute of Technical Mechanics of the National Academy of Sciences of Ukraine and the State Space Agency of Ukraine, Hudramovich V.S.
Published: July 2021

This paper gives a brief overview of investigations into the strength, reliability, and life of aerospace and power engineering structures conducted along the following reseach line of the Institute of Technical mechanics of the National Academy of Sciences of Ukraine and the State Space Agency of Ukraine: the strength, reliabiliyty, and optimization of mechanical systems, launch vehicle, and spacecraft. The basic literature sources of 1991–2021 are cited. A more detailed consideration is given to the results obtained in 2014–2021 and published (monographs, articles indexed in international citation databases, and international conference papers). They involve the simulation of deformation of inhomogeneous material, in particular concrete, in heat-and-power engineering structures, the life estimation of shell structures of rocket/space hardware in the presence of stress concentrators in the form of openings, inclusions, and cracks, and the development of a methodological basis for the strength, reliability, and life of launch complexes for launch vehicles of different spacecraft classes. The methodological stages of calculation are considered, and high-intensity thermomechanical loads are classified. The life of launch complexes is determined using the notion of low- and high-cycle fatigue. Consideration is given to the development of fast projection-iteration schemes of the finite-element method and the method of local variations, which significantly reduce the computational time and may be used to advantage when a large body of calculations is needed in the design and development of new aerospace hardware and power engineering structures with the use of experiments at the developmental stage. In doing so, the effect of inelastic deformations in the vicinity of cutouts is analyzed. A numerical simulation of the strength and stability of inhomogeneous shell structures with the use of the above-mentioned new computational schemes is considered. Investigations of this type first of all involve inhomogeneous thin-walled shell structures at local loads and the effect of reinforcing inclusions on stress and strain concentration.
Shape of dislocation line in stochastic shear stress field
Authors:   Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Lugovy M. I. , Verbylo D. G. ,   G.V. Kurdyumov Institute for  Metal Physics of the NAS of Ukraine, Brodnikovskyy M. P. ,   Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine
Published: July 2021

The shape of the dislocation line in the stochastic shear stress field in the glide plane was studied using the method of discrete dislocation dynamics. Stochastic shear stresses can occur due to the distortion of the crystal lattice. Such distortion may exist, for example, in a solid solution. Different atoms in a solid solution induce atomic size misfit and elastic modulus misfit into crystal lattice. These misfits result in crystal lattice distortions which varies spatially. The distortions are the origin of internal stresses in the lattice. Such internal stress in certain location has stochastic value normally distributed. The particular case of such stresses is shear stress distribution in the glide plane. The special method was developed to model such stress distribution. The stochastic shear stress field results in movement of different segments of dislocation line to form its equilibrium shape. The important characteristic parameters of the equilibrium shape can be measured by numerical methods. This shape also includes a "long-wavelength" component that has a non-zero amplitude and was formed without thermal activation. The shape of the dislocation line determines to some extent the yield strength of the material. Thus, the study of dislocation line shape and modeling its formation in the field of stochastic shear stresses can help to determine the yield strength of multicomponent alloys, especially multi-principal element alloys. Keywords: dislocation, discrete dislocation dynamics, shear stresses.
Чи має фундаментальна наука належний статус в Україні?
Authors: Локтєв Вадим Михайлович
Published: July 2021

Чи має фундаментальна наука належний статус в Україні?
Сучасні досягнення та ключові напрями подальшого розвитку загальнобіологічних досліджень в установах НАН України
Authors: Радченко Володимир Григорович
Published: July 2021

Сучасні досягнення та ключові напрями подальшого розвитку загальнобіологічних досліджень в установах НАН України
Influência do número de pás no torque estático da turbina eólica Savonius
Authors: Bianchin Lucas Santin , Beck Daniel , Seidel Denílson José
Published: July 2021

Turbinas eólicas são as responsáveis por converter a energia cinética do vento em energia mecânica, a qual é posteriormente convertida em energia elétrica por um gerador. Em geral, a turbina eólica do tipo Savonius apresenta como característica bons valores de coeficiente de torque estático, o que indica que a turbina é capaz de realizar a autopartida. O rotor Savonius é formado pelo conjunto de uma série de parâmetros geométricos e a alteração de um ou mais deles modifica o desempenho da turbina. Dessa forma, o objetivo principal deste trabalho é analisar com o auxílio da Dinâmica de Fluidos Computacional (CFD) a influência do número de pás no torque estático da turbina Savonius. Para isso, foram avaliados rotores com duas, três e quatro pás. As simulações de CFD foram realizadas utilizando o software Solidworks Flow Simulation 2016. Através da avaliação das simulações foi possível verificar que o aumento do número de pás diminui o torque estático da turbina Savonius, e consequentemente sua capacidade de autopartida.
Palavras-chave: Turbina eólica Savonius; dInâmica dos fluidos computacional; torque estático; número de pás.
Pathological and immunohistochemical aspects of acute megakaryoblastic leukaemia in a cat – Short communication
Authors: Molossi Franciéli Adriane , Henker Luan Cleber , Cecco Bianca Santana De , Bandinelli Marcele Bettim , Rodrigues Rochana , Sonne Luciana , Driemeier David , Pavarini Saulo Petinatti
Published: July 2021

An adult, mixed-breed, feline leukaemia virus (FeLV-) positive female cat was presented with mucosal jaundice and a history of anorexia and constipation for three days. Physical examination revealed splenomegaly, cachexia, and dehydration. Humane euthanasia was conducted, followed by postmortem examination. Grossly, the cat was icteric, and presented hepatomegaly with multifocal white spots and splenomegaly. Histologically, the bone marrow was nearly completely replaced by a proliferation of megakaryocytes and megakaryoblasts, and there was a proliferation of fibrous connective tissue. Similar neoplastic proliferation was observed infiltrating the liver, lymph nodes, spleen, kidney, skeletal muscle, and lungs. Immunohistochemistry was performed for von Willebrand Factor (VWF), CD79α, CD3, feline immunodeficiency virus, FeLV, and CD61. Marked cytoplasmic labelling was observed in the neoplastic cells for FeLV, VWF and CD61, corroborating the diagnosis of acute megakaryoblastic leukaemia.
Relationship between Human Capital Investment and Employees’ Work Efficiency in ATAP Bauchi: The Relevance of TETFund Interventions
Authors: Bello Hashim Sabo
Published: July 2021

As it is an established fact that, no nation or organization develops beyond the intellectual ability of its human resources. Nowadays, investment on human capital is paramount to sustain labour force participation in the progress and development of higher education in Nigeria. Besides, the Nigerian Universities and Colleges of Education, the polytechnic system provides another option for higher education in Nigeria where Certificates, National Diploma and Higher National Diploma courses are offered and awarded. The study aimed at evaluating the relevance of TETFund intervention on human capital investments and its bearing to employees’ work efficiency in the polytechnic communities in Bauchi state to be specific and Nigeria by extension. This study generates data from quantitative and qualitative sources, using questionnaire instrument to randomly collect a cross sectional data from one of the two (2) existing polytechnics in Bauchi state of Nigeria. A total of 45 structured questionnaires were administered on our respondents and 44 were valid for analysis. The research adopted the descriptive statistics as well as the Chi-square, X2, to analyze the results and test the hypothesis to give the tentative prediction about the nature of the relationship between the research variables. Thus the research believes that there is a significant relationship between TETFund intervention in human capital investment and employees’ work efficiency within educational polytechnic system in Nigeria. This research study recommended for the public organizations in Nigeria especially the education institutions to harnessed and take full advantage of the reciprocal benefits of human capital investments and the work efficiency in educational tertiary institutions as this will go a long way to raise organizational achievement towards an end with the least amount of resources.
Pengaruh Metode Kaisa Terhadap Kemampuan Menghafal Surat-Surat Pendek Al-Qur’an Dan Hadits Pada Anak Di Tk Aisyiyah 17 Jasem Ngoro Mojokerto
Authors: Aliyah Try Nur
Published: July 2021

This study aims (1) to determine the effect of the Kaisa method on the ability to memorize short letters of the Al-Qur'an and hadith in children at TK Aisyiyah 17 Jasem, (2) to determine the influence of the Kaisa method on the ability to memorize short letters. Al-Qur'an and hadith in TK Aisyiyah 17 Jasem. The research method uses quantitative ex-post facto correlation type. The sampling technique used was purposive sampling. Research data collection techniques are questionnaires and documentation. Test the validity of the questionnaire instrument using expert tests (judges). The data analysis technique used the product moment correlation formula. The conclusion of this study is that (1) there is an effect of the Kaisa method on the ability to memorize short letters from the Al-Qur'an and hadith in children. This is evidenced by the results of the calculation of rcount> rtabel, (0.999> 0.602) then H0 is rejected and H1 is accepted, (2) and the magnitude of the influence seen from the calculation results is 0.999 which has been consulted with the correlation coefficient value at the value of 0.800-1.00 including the category high, so it can be interpreted that the influence of the Kaisa method has a major effect on the ability to memorize short letters of the Al-Qur'an and hadiths in children at Aisyiyah 17 Kindergarten Jasem Ngoro Mojokerto.
Strategi Pendidikan dalam Menumbuhkan Kemampuan Berfikir Kritis Anak Usia Dini di Masa Covid-19
Authors: Syafi’i Imam , Chusnah Azimatul , Inayati Nur Alvi , Sari Linda Puspita
Published: July 2021

This study aims to describe and understand the strategy of educators in carrying out their duties during the COVID-19 pandemic in fostering critical thinking skills in early childhood. This research method uses qualitative research with a case study approach. Data collection techniques in this study using observation, interviews, and documentation. While the data analysis used the Miles and Huberman model with the stages of data reduction, data presentation, verification, and conclusion drawing. The results of this study indicate that, first, there is a change in the strategy for implementing the duties of teachers/educators, namely as planners and assessors of children's learning outcomes. While the task as implementers in early childhood educator learning in collaboration with teachers / educators at home, namely the child's parents. Second, the strategy of teachers/educators at home to cultivate children's critical thinking skills is to invite children to understand the reasons for schooling at home, the reasons for the obligation to use masks when leaving the house and others by using discussion and exemplary methods.
Multivariate Adaptive Regression Splines (MARS) for Modeling Student Status at Universitas Terbuka
Authors: Siti Hadijah Hasanah
Published: July 2021

Multivariate Adaptive Regression Splines (MARS) used to model the active student’s status in the Department of Statistics at Universitas Terbuka and determine the factors that influence the response variable. This study consists of 9 variables, namely gender, age, education, marital status, job, initial registration year, number of registrations, credits, and GPA, but after modeling using the MARS method, the explanatory variable can affect the response variable is the initial registration year. Several registrations, GPA, and credits. Based on the results of the R output and using a 95% confidence interval, each base 1 to 10 function is partially significant with the p-value of the base 1-10 function being smaller than 0.05 and simultaneously with a smaller p-value. of 0.05, so that the above model has a significant effect partially or simultaneously on the response variable. From these results, it is concluded that the MARS model is suitable for determining the factors that affect the active status of students.
Modeling of COVID-19 Epidemic Growth Curve in Indonesia
Authors: Fajar Muhammad , Wahyudi Wahyudi
Published: July 2021

Aim of this study is to make parametric modeling of the COVID-19 epidemic growth curve so that the maximum value and time at that point can be obtained from the cumulative cases of COVID-19. The data used in this study is the cumulative number of positive confirmed cases of COVID-19 from https://covid19.go.id/. The method used in this study is fitting data with the Logistic and Gompertz models. Result of this study are (1) the Logistic and Gompertz models are very fit in modeling the COVID-19 epidemic growth curve, indicated from the value of R2 (coefficient of determination) which reaches more than 99%; (2) From the Logistics model it is obtained that the estimated amount of the maximum cumulative case at the end of the COVID-19 epidemic is 7,714 positive confirmed cases, achieved in about 82 days (May 22, 2020) from Mar 2, 2020, when the first positive COVID-19 case was announced by the government; and (3) From the Gompertz model, it is obtained that the estimated maximum cumulative case at the end of the COVID-19 epidemic is 33,975 positive confirmed cases, achieved in about 152 days (Jul 30, 2020) from Mar 2, 2020. The results of this study can be used as input to the government to take steps in controlling the spread of COVID-19.
Foolishness in Modern Russian Theater (Based on the Director's Concept of Lev Ehrenburg)
Authors:   Youth Theater Center ", Shakleeva A. I. ,   Cosmos"
Published: July 2021

The article examines the foolishness as one of the ways of a new representation of reality in art on the example of the director’s concept of Lev Ehrenburg. The author analyzes the performances of the Nebolshoy Drama Theater in St. Petersburg in the 1990-2010s, tracing the influence of the aesthetic paradigm of foolishness on the director’s method. On the basis of the analysis, the author examines the reflection of the typological features of foolishness in the work of Lev Ehrenburg: belonging to the purl world, the marginality of heroes, the search for a lost paradise, the desire to overcome the boundaries of one’s own “I”. The author indicates the possibilities for further in-depth study of the issue, in which the aesthetic paradigm of foolishness can be considered in connection with the concept of total theatricality of Nikolai Evreinov, the performative turn in modern theater, as well as in other director’s concepts (N. Kolyada, A. Artemov, K. Bogomolov, A. Adasinsky).
Implementation of Project Activities in UrFU: Educational Publishing Project "Her Life" (Based on the Book by A. G. Korepanova)
Authors:   Ural Federal University, Plotnikova I. Yu. , Klimova O. V. ,   Ural Federal University
Published: July 2021

The article analyzes the student’s publishing project of creating the book “Her Life” as an example of practice-oriented activities carried out during college year. The publishing project was based on the book written by A. G. Korevanova “My Life”. The reasons for the choice of material for reprinting, the difficulties in the process of working on the project, the advantages and disadvantages of conducting project activities in the publishing sector are indicated. The project activity is considered as a type of training on the basis of the Department of Publishing of the Ural Federal University and the Publishing House of the Ural University.