bluuebunny/crossref_metadata_2025 huggingface dataset:
MODELING OF THE INITIAL POLLUTION OF THE GRAIN MIX BY THE LOADING OF THE TRIERE AND THE PARAMETERS OF THE DISTRIBUTION BOXES
Authors:   All-Russian Research Institute for Use of Machinery and Petroleum Products in Agriculture, Tishaninov Nikolay , Anashkin Alexander ,   All-Russian Research Institute for Use of Machinery and Petroleum Products in Agriculture, Emelyanovich Sergey ,   All-Russian Research Institute for Use of Machinery and Petroleum Products in Agriculture
Published: July 2023

Investigation of the dosing quality of the impurity component at low loading conditions of the experimental trier and low initial clogging with a long impurity using three distribution boxes with dimensions: 600 × 14 × 13 mm; 600×24×13 mm; 600×24×21 mm are made. Dosing quality indicators - the standard deviation and the coefficient of variation for single, pair, triple, quadruple and five distributing boxes, characterizing the required linear density of the distribution of the impurity component on the feeder belt, have been established. It has been established that the use of these boxes provides high dosing stability. The coefficient of variation under different conditions of their loading does not exceed 4.75%. Filling boxes with dimensions of 600×14×13 mm with shaking of impurities provides a higher quality of dosing: the standard deviation is lower by 18.9 - 47.32%, the coefficient of variation is by 23.96 - 49.45% for different frequency of unloading boxes at formation of the linear density of the impurity layer on the tape. A number of model compositions of grain mixtures, providing for the supply of 1.2 t / h, the variability of the initial contamination in the range of 0.46 - 6.65%; for the supply of 1.83 t/h, the range of initial contamination is 0.3 - 4.3%; for the supply of 2.45 t/h, the range of initial contamination is 0.22 - 3.25%; for the supply of 3.07 t/h, the range of initial contamination is 0.18 - 2.6%; for the supply of 3.71 t/h, the range of initial contamination is 0.15 - 2.15%; for the supply of 4.35 t/h, the range of initial contamination is 0.125 - 1.8%. established on the basis of the performed calculations. Distribution boxes of small cross section provide 20 interval values with a minimum step for each range of initial contamination, which allows you to qualitatively control the experiment when using a grain mixture with low values of contamination of the grain mixture and productivity of the trier.
Impact of Liberalisation of Locus Standi on Social Justice in International Human Rights: Analytical Study
Authors: - Sakshi Mishra , - Prachi Agarwal , - Palak Jain , - Prof. Ashish Yadav
Published: July 2023

To combat poverty, inequality, inadequate healthcare, environmental destruction, and other issues by the year 2030 and to create a peaceful world, the United Nations created a list of 17 global goals known as sustainable development goals. As of today, 193 nations have ratified these goals, with India being one of them. Due to numerous factors, including ignorance, poverty, a lack of knowledge, the high cost of litigation, and many others, the traditional approach to social justice was based on the Locus Standi principle, which states that only the victim can go to court to seek redress in a particular case. However, this approach was insufficient to establish social justice and protect human rights worldwide, so it was necessary to liberalize the Locus Standi principle.
Exploring the Psychological Well-Being of Tourism Community Members Through the Lens of Self-Determination Theory: A Case Study of Queenstown, New Zealand
Authors: Kondja Alice , Filep Sebastian , Mackenzie Susan Houge , Lo Ada , Vada Sera
Published: July 2023

Despite a substantial history of research on the well-being of host communities at tourism destinations, the individual psychological well-being of local residents remains an underexplored topic. This study explores the psychological well-being of tourism host community members through
a case study of Queenstown, New Zealand. By drawing on the self-determination theory, an innovative focus group analysis approach, microinterlocutor analysis, complemented by thematic analysis, was used to explain the psychological well-being of individual host community members in a nature-based
tourism destination. Findings revealed a sense of autonomy, relatedness to people and the natural environment, feelings of competence or mastery, and beneficence-supported psychological well-being. This study extends prior research on the well-being of host communities by identifying key psychological
well-being domains explicitly related to host community members. Practical implications of the findings are highlighted with reference to nature-based destinations.
EXAMINING THE IMPACT OF GREEN MARKETING STRATEGIES ON ORGANIZATIONAL PERFORMANCE AND COMPETITIVE ADVANTAGE
Authors: Hussain Zahid Hussain
Published: July 2023

ABSTRACT

 

Purpose: The objective of this study is to investigate the effects of green marketing strategies and corporate social responsibility (CSR) practices on organizational performance and competitive advantage. The study aims to advance understanding of CSR principles and green marketing strategies and to provide practical guidance to companies wishing to increase their commitment to sustainability while maintaining a profitable position in the Pakistan market.
Evaluación Baropodométrica Estática en Practicantes de Karate Do Asociado a Cadenas Lesionales Descendentes
Authors: Lievano Roque Mayant Arlette , López Hernández Litzi Haraiza , Morales Cortés Gabriela , Corzo Cuesta María Lourdes
Published: July 2023

La interacción de varias articulaciones y segmentos del cuerpo, se ha vuelto cada vez más importante en la biomecánica y la valoración de la funcionalidad de la cintura pélvica y las extremidades inferiores, es por eso que es importante destacar la importancia de la cadena cinemática cerrada, la cual esta involucraba en deportistas amateur de Karate Do en el estado de Chiapas. El método tradicional en la valoración del tipo de pie consistía, e involucraba la captura de la huella con talco y la medición de las dimensiones de la huella obtenida. Sin embargo, investigaciones previas han demostrado que un porcentaje significativo de individuos presentan pies asimétricos (Gómez, Influencia del deporte en las características antropométricas de la huella plantar, 2009), lo cual sugiere la necesidad de una evaluación más precisa. La identificación temprana de posibles alteraciones biomecánicas de la pelvis y la extremidad inferior, son esenciales para prevenir lesiones posturales y articulares, que suelen ser problemas comunes y a menudo no son atendidas por falta de interés e información adecuada. Por lo tanto, la evaluación podoscópica y el mapeo de presiones plantares, en combinación con la evaluación de la cadena cinemática cerrada, son herramientas valiosas para mejorar la eficacia del deportista amateur.
Mental disorders in child epilepsy
Authors:   “George Emil Palade” University of Medicine, Pharmacy, Science, and Technology of Targu Mures, Romania, Racos-Szabo Elisabeta ,   Clinic of Pediatric Neurology and Psychiatry, Targu Mures, Romania, Száva Iringó ,   Clinic of Pediatric Neurology and Psychiatry, Targu Mures, Romania, Todoran-Butila Anamaria ,   “George Emil Palade” University of Medicine, Pharmacy, Science, and Technology of Targu Mures, Romania
Published: July 2023

Introduction. Epilepsy is a chronic condition characterized by the presence of recurrent paroxysmal brain seizures (epileptic seizures), as a result of an excessive discharge of neurons. The prevalence of mental disorders in epilepsy is of 30-40%, and those of psychoses of 1-3%, being higher in patients with temporal lobe epilepsy. Psychoses and personality disorders are 3 times more frequent in those with temporal lobe seizures. Among the mental disorders in child epilepsy we care to mention: cognitive impairment, behavior disorders with aggressiveness and psychomotor agitation, learning disorders, depression, anxiety. Material and methods. There have been evaluated 24 children with epilepsy, admitted in 2014 in the Clinic of Pediatric Neurology and Psychiatry Tg-Mures, with ages between 12 and 18. There have been applied Raven's Matrices, various scales for depression and anxiety (MASC, Hamilton, Beck, Bender). The diagnosis of mental disorders has been established based on the criteria DSM-V and ICD 10. Results. The prevalence of mental disorders in child epilepsy was of 12%, with the highest incidence in the group age between 10 and 12. These mental disorders have been: cognitive disorders (79%), behavior disorders (37,5%), disharmonic personality developments (33%), anxiety (20,8%), psychosis (8,3%), depression (4,2%). Discussions. Child epilepsy evolves having a high risk for the occurrence of cognitive impairment, behavior disorders, language or mood disorders all the more so as the underlying structural disorders are higher. The early onset of the epileptic seizures under the age of 3, in a child with a psychic under development represents a vulnerability factor. Patients with temporal lobe epilepsy present a risk for psychoses, also 1/3 of the epileptics develop personality disorders. Conclusions. The onset of epileptic seizures under the age of 3 constitutes a risk factor for the occurrence of language disorders, cognitive or behavior disorders. The prognostic in mental disorders in the epileptic child is influenced by the underlying structural brain anomalies responsible for the occurrence of epileptic seizures.
Classification of Trajectories in a Two-planet Exosystem Using the Generalized Three-body Problem
Authors: Moneer Eman M. , Dubeibe Fredy L. , Allawi Yazan M. , Alanazi Meznah M. , Hinse Tobias C. , Zotos Euaggelos E.
Published: July 2023

We deploy the theory of the generalized three-body problem to describe an exosystem composed of a host star, a transiting Jupiter-sized exoplanet, and an Earth-sized exoplanet. By performing a thorough and systematic orbit classification we map a large section of the phase space and determine the final states of the Earth-sized exoplanet. In particular, we manage to classify the initial conditions of the perturber into several categories such as bounded regular or chaotic motion, collision, and escaping motion. Bounded regular motion corresponds to regions of the phase space in which the orbit of the Earth-sized planet would be stable. In our computations, we use realistic values of the involved parameters and initial conditions corresponding to real observable exosystems. Our analysis provides important information on how the mass of the host star as well as the mass of the Jupiter size affects the orbital dynamics of the Earth-sized exoplanet.
Rapid Growth of Galactic Supermassive Black Holes through Accreting Giant Molecular Clouds during Major Mergers of Their Host Galaxies
Authors: Lin Chi-Hong , Chen Ke-Jung , Hwang Chorng-Yuan
Published: July 2023

Understanding the formation of the supermassive black holes (SMBHs) present in the centers of galaxies is a crucial topic in modern astrophysics. Observations have detected SMBHs with masses of 109
M
⊙ in the high-redshift galaxies with z ∼ 7. However, how SMBHs grew to such huge masses within the first billion years after the Big Bang remains elusive. One possible explanation is that SMBHs grow quickly through the frequent mergers of galaxies, which provides sustainable gas to maintain rapid growth. This study presents the hydrodynamics simulations of the SMBHs’ growth with their host galaxies using the GIZMO code. In contrast to previous simulations, we have developed a giant molecular cloud (GMC) model by separating molecular gas particles from atomic gas particles and then evolving them independently. During major mergers, we show that the more massive molecular gas particles’ cloud bears stronger dynamical friction. Consequently, GMCs are substantially accreted onto the galactic centers that grow SMBHs from ∼107 to ∼109
M
⊙ within 300 Myr, which explains the rapid growth of SMBHs, and this accretion also triggers a violent starburst at the galactic center. Furthermore, we examine the impact of minor mergers on the bulge of a Milky Way–like galaxy and find that the size and mass of the bulge can increase from 0.92 to 1.9 kpc and from 4.7 × 1010 to 7 × 1010
M
⊙.
The Prevalence and Influence of Circumstellar Material around Hydrogen-rich Supernova Progenitors
Authors: Bruch Rachel J. , Gal-Yam Avishay , Yaron Ofer , Chen Ping , Strotjohann Nora L. , Irani Ido , Zimmerman Erez , Schulze Steve , Yang Yi , Kim Young-Lo , Bulla Mattia , Sollerman Jesper , Rigault Mickael , Ofek Eran , Soumagnac Maayane , Masci Frank J. , Fremling Christoffer , Perley Daniel , Nordin Jakob , Cenko S. Bradley , Ho Anna Y. Q. , Adams S. , Adreoni Igor , Bellm Eric C. , Blagorodnova Nadia , Burdge Kevin , De Kishalay , Dekany Richard G. , Dhawan Suhail , Drake Andrew J. , Duev Dmitry A. , Graham Matthew , Graham Melissa L. , Jencson Jacob , Karamehmetoglu Emir , Kasliwal Mansi M. , Kulkarni Shrinivas , Miller A. A. , Neill James D. , Prince Thomas A. , Riddle Reed , Rusholme Benjamin , Sharma Y. , Smith Roger , Sravan Niharika , Taggart Kirsty , Walters Richard , Yan Lin
Published: July 2023

Narrow transient emission lines (flash-ionization features) in early supernova (SN) spectra trace the presence of circumstellar material (CSM) around the massive progenitor stars of core-collapse SNe. The lines disappear within days after the SN explosion, suggesting that this material is spatially confined, and originates from enhanced mass loss shortly (months to a few years) prior to the explosion. We performed a systematic survey of H-rich (Type II) SNe discovered within less than 2 days from the explosion during the first phase of the Zwicky Transient Facility survey (2018–2020), finding 30 events for which a first spectrum was obtained within <2 days from the explosion. The measured fraction of events showing flash-ionization features (>36% at the 95% confidence level) confirms that elevated mass loss in massive stars prior to SN explosion is common. We find that SNe II showing flash-ionization features are not significantly brighter, nor bluer, nor more slowly rising than those without. This implies that CSM interaction does not contribute significantly to their early continuum emission, and that the CSM is likely optically thin. We measured the persistence duration of flash-ionization emission and find that most SNe show flash features for ≈5 days. Rarer events, with persistence timescales >10 days, are brighter and rise longer, suggesting these may be intermediate between regular SNe II and strongly interacting SNe IIn.
Prediction Capability of Geomagnetic Events from Solar Wind Data Using Neural Networks
Authors: Telloni Daniele , Schiavo Maurizio Lo , Magli Enrico , Fineschi Silvano , Guastavino Sabrina , Nicolini Gianalfredo , Susino Roberto , Giordano Silvio , Amadori Francesco , Candiani Valentina , Massone Anna Maria , Piana Michele
Published: July 2023

Multiple neural network architectures, with different structural composition and complexity, are implemented in this study with the aim of providing multi-hour-ahead warnings of severe geomagnetic disturbances, based on in situ measurements of the solar wind plasma and magnetic field acquired at the Lagrangian point L1. First, a statistical analysis of the interplanetary data was performed to point out which are the most relevant parameters to be provided as input to the neural networks, and a preprocessing of the data set was implemented to face its heavy imbalance (the Earth’s magnetosphere is in fact mostly at rest). Then, neural networks were tested to evaluate their performance. It turned out that, in a binary classification problem, recurrent approaches are best at predicting critical events both 1 and 8 hr in advance, achieving a balanced accuracy of 94% and 70%, respectively. Finally, in an attempt at multistep prediction of the criticality of future geomagnetic events from 1–8 hr ahead, more complex neural networks, built by merging the different types of basic convolutional and recurrent architectures, have been shown to outperform single-step and state-of-the-art approaches with a balanced accuracy of at least 70%. Interestingly, the accuracy peaks at 4 hr, corresponding to the waiting time between the detection of solar drivers at L1 and the onset of the geomagnetic storm (as previously obtained by statistical investigations), suggesting that on average this is the time the Earth’s magnetosphere takes to react to the solar event.
Acoustic Scaling for Small Rotors in Hover
Authors:   University of Texas Austin, Tinney Charles , Valdez John
Published: July 2023

This paper discusses an effort to determine useful scaling laws for predicting the sound pressure levels at various observer positions for small scale rotors in hover. Surveys of rotor thrust, rotor torque and near-field acoustics are acquired using a series of identically shaped two-bladed rotors ranging between 8 and 18 inches in diameter. Rotor speeds were varied between 50 and 90 revolutions per second which equate to blade tip Mach numbers as high as 0.56.Common sound metrics like overall sound pressure level, sound pressure level and blade-pass frequency harmonic noise were correlated with both dimensional variables (rotor thrust, torque, power and blade tip speed) and non dimensional variables (thrust and power coefficients, Reynolds number, blade tip Mach number and figure of merit)pertaining to rotor performance. The findings revealed a new correlation parameter for predicting rotor noise based on the product of figure of merit with blade tip Mach number. It is postulated that an increase in rotor collective translates to an increase in loading noise. So long as the flow remains attached, the increased loading noise is expressed by an increase in figure of merit. This new correlation parameter is shown to provide a reasonable collapse of all rotor noise data. In order to account for the directivity of the sound field, a second order response surface model of this new correlation parameter was developed and validated.
Noise Prediction of Multi-rotor Unmanned Aerial Vehicle Considering Wake Interaction Effect
Authors:   Korea Advanced Institute of Science and Technology, Lee Hakjin , Lee Duck-Joo
Published: July 2023

Wake interaction phenomenon severely occurs in the unmanned aerial vehicles (UAVs) with multi-rotor configuration. In the present work, the computational study of a small-scale quadcopter UAV was carried out to investigate the wake interaction effects in terms of the aerodynamic performance, wake structure, and acoustic characteristics. Numerical simulation of DJI Phantom 2 model in hover flight has been carried out using nonlinear vortex lattice method (NVLM) with vortex particle method (VPM) and acoustic analogy based on Farassat-1A formula. Calculations for quadcopter configuration with various separation distances between neighboring rotors were compared with the isolated rotor to study the complex wake flow of the multi-rotor system. It is found that the average thrust coefficient decreases and the thrust coefficient begins to fluctuate dramatically, as an interval between the rotors gets smaller. In addition, wake geometry appears to radially shift toward the neighboring rotors, thus leading to strong wake-to-wake interaction. The sound pressure level of the quadcopter is much higher than that of the isolated rotor, and tonal noise associated with the rotor blade passing frequency (BPF) can be captured.
CFD Calculations of the XV-15 Tiltrotor During Transition
Authors:   STC Corp, Tran Steven ,   US Army CCDC Aviation and Missile Center, Lim Joon ,   Kitty Hawk Corporation, Bowen-Davies Graham , Nunez Gerardo , Wissink Andrew
Published: July 2023

The focus of this work is to develop an understanding of the complex aerodynamics of the Bell XV-15 tiltrotor aircraft throughout its conversion from hover to forward flight. To accomplish this, high fidelity CFD simulations using HELIOS are done at six different stages of the maneuver: hover mode, conversion mode (75°,60°, and 30° nacelle angles), and cruise (160 and 220 knots). Good agreement is found when comparing the CFD results against OARF experiments, GTR flight simulator data, and flight test data. The HELIOS predictions show that significant interactional effects on the rotor occur during hover and cruise due to fountain reingestion/ground effect and wing proximity, respectively. These interactions lead to sudden, impulsive fluctuations in normal force and pitching moments on the blades as they pass over the wing. Fluctuations in the normal force with peak-to-peak amplitudes on the order of the mean blade loading are observed. The conversion mode is characterized by large unsteady blade loading due to the highly asymmetrical flow although the interactional effects are almost nonexistent. Overall the trimmed CFD approach used in this work offers a high-fidelity approach to analyze full vehicle tiltrotors in all configurations of flight.
High-Fidelity Computational Analysis of Ducted and Coaxial Rotors for Urban Air Mobility
Authors:   NASA Ames Research Center, Diaz Patricia , Rubio Rafael , Yoon Seokkwan
Published: July 2023

High-fidelity computational fluid dynamics simulations have been carried out for ducted and coaxial rotors, for urban air mobility applications. The three-dimensional unsteady Navier-Stokes equations are solved on overset grids using high-order accurate schemes, dual-time stepping, and a hybrid turbulence model. Performance has been assessed by looking at the rotor coefficients, and acoustic behavior has been qualitatively studied through the observation of pressure fluctuations. The effects on performances of several duct parameters are first assessed. Counter-rotating and co-rotating coaxial rotor systems are then studied and compared, and the effect of the duct on these systems is analyzed.
Computational Analysis of Rotor-Blown-Wing for eVTOL Applications
Authors:   Rensselaer Polytechnic Institute, Misiorowski Matthew ,   US Army Research Lab, Anusonti-Inthra Phuriwat , Gandhi Farhan
Published: July 2023

This study examines the performance of a rotor-blown-wing in hover and forward flight conditions. Flow solutions were generated using Helios, with a Detached Eddy Simulation (DES) model. The configuration is based on one set of rotors/wing of a quadrotor bi-plane tail-sitter aircraft. Simulations were conducted to assess the effect of varying angle of attack, rotor RPM, and rotor diameter. Two configurations were examined, the RBW baseline with two 60.96 cm diameter rotors, and the RRR configuration with four 30.48 cm diameter rotors. The smaller rotors were analyzed at the RPM corresponding to producing half the thrust of the RBW baseline rotor. The presence of the wing in hover resulted in the RBW baseline rotor operating at 1.9% lower power loading than the same rotor in isolation. In comparison, the RRR configuration reduced power loading by 13.6% compared to the isolated rotor. In forward flight (airplane mode), increasing angle of attack was shown to increase thrust produced on the downstroke side of the rotor. Furthermore, the presence of the wing increases the thrust produced on the bottom half of the disk. Both the blown-wings increase the L/D ratio from 3.2 for the isolated wing to 3.6 and 4.3 for the RBW baseline and RRR configurations respectively.
Full-Configuration CFD Analysis of the S-97 RAIDER
Authors:   Sikorsky a Lockheed Martin Co., Bowles Patrick , Matalanis Claude , Battisti Margaret , Min Byung-Young , Wake Brian , Tuozzo Nick , Lorber Peter
Published: July 2023

The S-97 RAIDER™ is a next-generation light tactical helicopter which uses a coaxial dual main rotor and aft-mounted propeller for auxiliary propulsion. This advanced configuration presents challenges for aerodynamic modeling, particularly with regard to the interactions between various components and their dependency on flight condition and trim state across a wide envelope. This paper describes continued research into the aerodynamics of the coupled aircraft components. Computational simulations of multiple combinations of components have been conducted for a series of pitch sweeps and flight conditions. These computational fluid dynamics (CFD) results are compared to available scale-model wind-tunnel test results. As is typical with development programs, changes were made between the original small-scale testing and analysis, and the current flight-test aircraft. In addition, the available computational methods and processing capabilities have improved significantly since the program started in 2010.
Dynamic Testing of a High-Specific-Torque Concentric Magnetic Gear
Authors:   NASA Glen Research Center, Scheidler Justin , Cameron Zachary , Tallerico Thomas
Published: July 2023

This paper presents measurements of the efficiency of NASA's 2nd magnetic gear prototype. A detailed discussion of the test rig used to make these measurements was presented, including a thorough uncertainty analysis. The reported uncertainties are 95% confidence intervals that include the effects of temperature and parasitic loads. The prototype's response was measured at output speeds between 124 rpm and 744 rpm for a controlled output torque of 10 Nm (8% of the prototype's maximum torque). After correcting for tare losses, the prototype's efficiency was found to decrease from 90.0% to 83.0% as speed increased. If the efficiency is extrapolated to a typical operating condition (85% of maximum torque) using the good assumption that energy loss is approximately independent of the transmitted torque, the expected efficiency would be 99.0% to 98.4%, which exceeds the state of the art for these speeds.
Pericyclic Transmission Prototype: Detailed Component Design, Analysis, and Fabrication
Authors:   Pennsylvania State University, Mathur Tanmay ,   NASA Glen Research Center, Stevens Mark , Smith Edward , Bill Robert
Published: July 2023

Based on component level and system level design analysis tools developed in the past years, an internally-driven torque sharing, twin configuration, Pericyclic drive concept has been developed to operate within allowable operating conditions of the NASA Glenn Transmission Test rig. In this work, design refinements and additional features required for successful fabrication, assembly, and testing of the prototype transmission are described. Thereafter, the weights and inertia of the components are updated in the design analysis to predict performance characteristics of the test article such as efficiency, bearing loads and life, tooth loads, lubrication requirements, and component stiffness. Some of these results will be validated from test runs of the prototype scheduled for near future. The current status of design and fabrication of rotating and static components is also reported.
Effect of Maneuvering and Gust Loads on the Two-Speed Shift Dynamics of a Helicopter Equipped with a Dual Clutch Transmission
Authors:   University of Tennessee, DeSmidt Hans ,   Pennsylvania State University, Smith Edward , Su Xiaowen , Bill Robert
Published: July 2023

This paper explores the effects of maneuvering and gust loads on the drive system and flight dynamic response of a single main rotor helicopter equipped with a two speed dual clutch transmission. The authors demonstrate that performing upshifts during certain maneuvers can significantly reduce the transmitted clutch frictional torques and the resulting clutch pack temperature rise during gear changes. For example, compared with an upshift in level flight, performing a 8° pitch-up maneuver reduced peak clutch frictional power dissipation by 63% (from 455 Hp down to 169 Hp) and reduced total upshift time by 37% (from 5 seconds down to 3 seconds). This results in an 83% reduction in total heat energy dissipated by the clutch during the upshift. Since the design of the clutch pack mass is directly proportional to the heat dissipation requirements, this new (Maneuver Assisted Shifting) MAS technique could enable significant weight savings and clutch wear reduction in helicopter two-speed transmissions.
Design and Development of the Main Rotor Gearbox for the Sikorsky Boeing SB>1 DEFIANT JMR Technology Demonstrator Aircraft
Authors:   The Boeing Company, Bouwer Scott , Kaiser Eric
Published: July 2023

The Sikorsky Boeing SB>1 DEFIANT is a technology demonstrator aircraft that is being built under the Joint Multi-Role Technology Demonstrator (JMR TD) program to address the next generation performance requirements of the Future Vertical Lift program which is led by the US Army. The design and development of the main rotor gearbox (MRGB) on the SB>1 DEFIANT Technology Demonstrator incorporated a number of lower TRL technologies and innovative design solutions to meet challenging technical requirements imposed by a generational leap in vehicle performance. The SB>1 DEFIANT main rotor drive system (MRDS) configuration is summarized with an account of advanced technologies incorporated and ground testing performed to successfully incorporate low TRL technologies in a flight vehicle that breaks performance barriers.
Fundamental Studies of a Variable-Voltage Hybrid-Electric Powertrain
Authors:   University of Maryland, Mills Brent , Datta Anubhav
Published: July 2023

Advances in electric propulsion may provide the opportunity to incorporate multiple distributed propulsors through the use of electric drives and electric power transmission at dramatically lighter weights than mechanical drivetrains. While small-scale UAS (0-20lb) have achieved distributed electric drivetrains, the electro-chemical power-sources do not scale and are weight prohibitive for larger UAS and future eVTOL aircraft with practical range, endurance, and payload requirements. An alternative to the electro-chemical powertrain is the hybrid-electric powertrain. In this paper, a variable-voltage hybrid-electric powertrain is designed, constructed, and tested carefully to examine the effects of variable-voltage generators for variable-RPM electric drives. The paper examines the powertrain component by component, with over 370 test points, from a single electric drive to an integrated powertrain with four distributed propulsors, in a fully instrumented test bed.
Gearbox Planetary Bearing Cage Failure Analysis
Authors:   SKF Aeroengine, Fitzgerald Joshua , Allison Bryan , Lunz Tom , Misiaszek Matthew
Published: July 2023

There is a constant push within the rotorcraft community to increase performance while simultaneously reducing weight in all systems. For rolling element bearings, this translates to a demand for alternative materials with lower density and improved mechanical properties. This combination of new materials and increasingly demanding application conditions goes beyond historical experiences and defined design and analysis standards. A consequence of this is that tests of these new technologies occasionally result in failure. This was the case during a recent series of gearbox tests during which two different bearing designs failed due to cage issues. The two bearing designs included cages manufactured out of different materials, and the cages failed due to two distinct failure modes (wear and structural fatigue). These test results were used to validate computational results from SKF's proprietary multibody dynamics software, BEAST (BEAring Simulation Tool). A combination of elemental testing and computational analysis is now being used to explore the feasibility of alternative material substitutions to avoid the high cost and long lead time of additional full scale testing.
The effectiveness of the grammar translation method for learning english in higher education institutions
Authors: Shliakhtina Olena , Kyselova Tetiana , Mudra Svitlana , Talalay Yuliya , Oleksiienko Alla
Published: July 2023

The aim of the article is to investigate the impact of the Grammar-Translation Method, an approach prioritizing translation and grammatical understanding in language learning, on the development of foreign language writing competence among students studying English in higher education institutions (HEIs). Testing methods, expert evaluations, and statistical analysis were employed. Significant differences were found across all criteria (p≤0.01) using both the Mann-Whitney test and the Wilcoxon test. The datagathered affirm the high effectiveness of the Grammar-Translation Method in building foreign language writing competences among HEI students. This result is attributed to the universality of the method, emphasizing work with text and its grammatical features. Future research should aim to identify effective methods for developing various components of foreign language competence in HEIs.
STEFAN PRVOVENČANI: PRVI SRPSKI KRALj I DRUGI SRPSKI BIOGRAF U RECEPTIVNOJ MISLI XX VEKA
Authors:   University of Kragujevac, Faculty of Filology and Arts, Simić Anka
Published: July 2023

In literary studies during the 20th century, special attention was paid to biographies, as the most important group of Serbian old literature. Old Serbian biographies, apart from belonging to hagiographic works, can be viewed as historic, which makes them the main monuments of the past. They contain data from both world and Serbian history, which is a valuable material for literary and artistic creativity. The literary work of the first Serbian king and the second Serbian biographer was studied in literary critiques of the 20th century. The character of the king, as well as his literary work, were established through the studies of literary critics who dealt with the king’s life and work: Pavle Popović, who was only interested in the king’s Life of Saint Simeon; Đorđe Trifunović and Dimitrije Bogdanović, who analyzed the king’s legal texts; Milan Kašanin, who noticed the ideological elements in Stefan’s description of his father’s life.
PERUĐA I ISPITIVANjE SADAŠNjOSTI U PUTOPISU „LjUBAV U TOSKANI“ MILOŠA CRNjANSKOG
Authors:   University of Kragujevac, Faculty of Filology and Arts, Janjić Danijela
Published: July 2023

In tutte le opere di Miloš Crnjanski dedicate all’Italia (Amore in Toscana, Presso gli Iperborei, Libro su Michelangelo) i flussi narrativi si diramano quasi ugualmente sul piano del passato e sul piano del presente. L’apparente leggerezza del presente viene bilanciata dagli elementi più pesanti della storia, della cultura, dell’arte e persino degli oggetti e degli edifici, che passano dal passato ed entrano in scena del presente. Si crea un equilibrio a causa del quale il confine tra il passato e il presente viene cancellato e questo, a sua volta, porta alla consapevolezza che il presente è permanente e senza limiti. Ogni pensiero diventa un peculiare esame del presente che conduce all’esame del proprio essere. Mostriamo come funziona questo processo in Crnjanski analizzando il capitolo Perugia nel diario di viaggio Amore in Toscana, utilizzando come punto di partenza i risultati della ricerca di Željko Đurić esposti nella sua analisi del capitolo Pisa della stessa opera di Cr- njanski, alcune caratteristiche della “fluidità del viaggio” di cui parla Jelena Todorović nella sua monografia L’eterno presente e alcuni principi del Cubismo che sono stati presentati da Ardengo Soffici nel suo saggio Cubismo e Futurismo.
Community Empowerment through Micro, Small and Medium Enterprises (MSMEs) at the Department of Industry and Trade Cooperatives in Sampang District, Sampang Regency
Authors:   Faculty of Public Administration Science, Universitas Madura, Fachrizi Ach. Resa , Luaylik Nur Fathin ,   Faculty of Public Administration Science, Universitas Madura, Imam Achmad ,   Faculty of Public Administration Science, Universitas Madura
Published: July 2023

The existence of MSMEs in Sampang Regency is not all MSMEs can be fostered by related agencies. The existing problems includes weaknesses in access to information, lack of infrastructure assistance and capital fertilization, lack of HR skills and weaknesses in partnership networks. The purpose of this study is to empower the community of MSME actors to achieve a society that is independent, self-sufficient, able to adopt innovations and develop MSMEs. Community empowerment carried out to MSME actors uses three aspects, namely, Enabling, Protecting, and Empowering. The research method used is a descriptive qualitative approach, then the data collection technique used is an interview and documentation technique with five informants, namely the State Civil Apparatus as many as three people and the community or MSME actors two people who refer to purposive sampling techniques. The data analysis used is an interactive model analysis technique from Miles and Huberman. The results of the study obtained an explanation that community empowerment through Micro, Small and Medium Enterprises in the Diskopindag in Sampang District, Sampang Regency did not run optimally after being analyzed using three indicators of community empowerment because there are still many obstacles that are not in accordance with the expectations of MSME actors. So it can be concluded that community empowerment through Micro, Small and Medium Enterprises at the Department of Industry and Trade Cooperative in Sampang District, Sampang Regency, can be said to have not run optimally.
Personality Prediction Based on Facebook Media Social Status Using the Method Naïve Bayes and KNN
Authors:   MTI Universitas AMIKOM Yogyakarta , Jl Ringroad Utara, Condongcatur, Depok, Sleman, Yogyakarta Indonesia 55283, Oktafiqurahman Andi , Kusrini Kusrini ,   MTI Universitas AMIKOM Yogyakarta , Jl Ringroad Utara, Condongcatur, Depok, Sleman, Yogyakarta Indonesia 55283, Nasiri Asro ,   MTI Universitas AMIKOM Yogyakarta , Jl Ringroad Utara, Condongcatur, Depok, Sleman, Yogyakarta Indonesia 55283
Published: July 2023

Social media is now almost a part of life for people of almost all ages with diverse personalities. This study aims to predict a person's personality based on Facebook social media status using the Naïve Bayes algorithm and K-NN personalities based on the big five. The data taken from MyPersonality which is divided into 40% training data, and 60% test data produces an accuracy rate of 100%, 100% precision, 100% recall can be concluded that the prediction variables are (significant) with the Naive Bayes method. While predictions using the KNN method showed an average personality prediction value with an accuracy of 58.96% (Insignificant), precision 99.12% (Significant), and recall 2.34% (Insignificant). Based on research can be concluded that both Naïve Bayes and KNN methods can be used to predict personality based on Facebook status.
The Effectiveness of Using Discovery Learning-Based Student Worksheets to Improve Students’ Critical Thinking Skills on Heat Transfer Topic
Authors:   Program Studi Magister Pendidikan Dasar, Program Pascasarjana, Universitas Muhammadiyah Makassar,Indonesia, Yuspitasari Jian , Rahmawati Rahmawati ,   Program Studi Pendidikan Fisika, FKIP, Universitas Muhammadiyah Makassar, Indonesia, Bancong Hartono ,   Program Studi S3-Pendidikan, Program Pascasarjana, Universitas Muhammadiyah Makassar, Indonesia
Published: July 2023

Critical thinking skills are one of the skills that are very important for students to have in the challenging 21st century education era. Therefore, critical thinking skills need to be provided to students through appropriate and well-organized learning processes. One of the learning components that is able to assist teachers in preparing teaching and learning activities in class is to provide teaching materials that are in accordance with the expected learning objectives. One teaching material that can assist teachers in providing critical thinking skills and organizing student learning in class is Discovery Learning-based Student Worksheets. The purpose of this study was to determine the effectiveness of Discovery Learning-based worksheets in an effort to improve the critical thinking skills of fifth grade elementary school students on the topic of heat transfer. This research is a type of pre-experimental research using a one group pre test – post test design. The research subjects consisted of 30 fifth grade elementary school students at SDN 38 Parepare. The sampling technique for this study used a purposive sampling technique with a population of 99 fifth grade students consisting of three classes. The research instrument is a Discovery Learning-based worksheet and a critical thinking skills- test. The analysis technique was in the form of descriptive statistics in the form of N-Gain, effect size, and t-test. Based on the results of the analysis of the three measurements, it can be concluded that the use of Discovery Learning-based student worksheet was significantly effective in improving students' critical thinking skills on the topic of heat transfer.
The Effect of Liquidity, Leverage, Profitability, and Company Size on Bond Ratings in Banking Sector Companies in Indonesia 2017- 2020
Authors:   Master of Management, Mercubuana University, Mentari Purba Vini Citra , Dewi Syarif Andam ,   Master of Management, Mercubuana University
Published: July 2023

This study aims to detect empirical evidence regarding the effect of Liquidity, Leverage, Profitability and Company Size on bond ratings. The population in this study is banking companies listed on the Indonesia Stock Exchange in the period 2017- 2020. The sampling method used was purposive sampling and the data used are secondary data in the form of the annual financial ratios. 13 banking companies that met the criteria were sampled. The data analysis method used is panel data regression analysis. Panel regression analysis model used is the Common Effect model. The results showed that Liquidity had a negative and significant effect on bond ratings, Leverage had a negative and not significant effect on bond ratings, Profitability and Company Size had a positive and significant effect on bond ratings.
Analysis of the Application of the Principles of the Theories of Motivation in the Gamification of Learning
Authors:   Volga Polytechnic Institute, Abramova Oxana
Published: July 2023

Recently, in the field of education, there has been a serious problem associated with the motivation for learning among schoolchildren and students. This is evidenced by the statistics of surveys of teachers and parents, which are similar in that there is a tendency to reduce the motivation to acquire new knowledge among children and adolescents, which, as a result, leads to a decrease in the overall level of education and training of specialists in various fields. The text analyzes theories of motivation, the concept of gamification and the principles of its use in the learning process are explored, as well as the relationship between motivation for learning and the gamification of the process. The author attemps to identify the main motivation theories and suggests options for using them in the development of software products for schools and higher educational institutions
Multi-Access Filtering using FOG-Enivronment
Authors: S Gowtham , S Mohammed Abdullah , J Asha , I Nawin Ram Shanker , J Selwin Isac Neilsingh
Published: July 2023

Fog computing is gaining popularity, even in traditionally conservative and delicate sectors like the Armed forces and nations.The interconnection of our community and technology breakthroughs like the IOT technology both have an impact on this. However, one of many crucial factors in fog computing adoption is guarding against privacy leaks. As a result, we present a multi-layer access filtration model in this study that safeguards privacy and was designed for such fog-based cloud environment, thus the name (FAF)fog-based access filter. The three major algorithms that make up FAF are the tuple reduction algorithm, the optimal privacy-energy-time methodology, and the access filter initialization method. The different protective aims are also distinguished using a hierarchical classification. Our experimental evaluation's conclusions show that FAF enables one to strike the perfect balance between privacy protection and computing costs.
Recommendation of Music Based on Facial Emotion using Machine Learning Technique
Authors: G Sakthi Priya , A Evangelin Blessy , S Jeya Aravinth , M Vignesh Prabhu , R VijayaSarathy
Published: July 2023

Music plays a vital role in human life, and it is a valid therapy to potentially reduce depression, anxiety, as well as to improve mood, self-esteem, and quality of life. Music has the power to change human emotion as expressed through facial expression. It’s a difficult task to recommend music based on emotion. The existing system on emotion recognition and music recommendation is focused on depression and mental health analysis. Hence a model is proposed to recommend music based on recognition of face expression to improve or change the emotion. Face emotion recognition (FER) is implemented using YoloV5 algorithm. The output of FER is a type of emotion classified as happy, anger, sad, and neutral which is the input to music recommendation system. A Music player is created to keep track of the user’s favorite based on the emotion. If the user is new to the system, then generalized music will be suggested. The aim of the paper is to recommend music to the user according to their emotion to further improve it.
Research on the Impact of Personal Characteristics of Executive Team on the Solvency of Companies
Authors: Song Meiru
Published: July 2023

As the core of corporate governance, the personal characteristics of the executive team have a certain impact on corporate solvency. This paper puts forward research-related hypotheses based on the theory of top echelon and overconfidence theory, takes the gender, age, and academic background of the executive team as independent variables, and indicates five indicators of corporate solvency as dependent variables, and designs a model in which the personal characteristics of the executive team have an impact on the company's solvency, and then this paper takes 120 listed companies in the domestic media industry in the period of 2017-2021 as the object of the study, and Using stepwise regression analysis to empirically study the relationship between the executive team's gender ratio, age, educational background and corporate solvency. It is found that the gender ratio of executive team members has a significant impact on the company's solvency, and the company's short-term solvency is stronger when there are more females in the executive team, while a smaller proportion of females and a higher proportion of males will improve the company's long-term solvency.
HISTÓRIA E FILOSOFIA DA CIÊNCIA EM DEBATE: A FILOSOFIA NATURAL MEDIEVAL E O CONTINUÍSMO EM EDWARD GRANT
Authors: Da Silva Luiz Cambraia Karat Gouvêa
Published: July 2023

A origem da chamada “ciência moderna” é tema de uma das maiores controvérsias da História das Ciências. Atualmente, a perspectiva teórica hegemônica é aquela que defende que a ciência moderna teve suas raízes na chamada “Revolução Científica”, porém, nas últimas décadas, esta visão tem sido reavaliada por alguns historiadores. Denominados “continuístas”, estes pensadores pesquisam as contribuições do campo intelectual medieval na construção de um pensamento crítico, lógico e racional, fundamental para a metodologia científica moderna.  Esta comunicação tem como objetivo analisar os estudos do historiador medievalista Edward Grant que, ao voltar sua atenção ao papel desempenhado pela filosofia natural na Baixa Idade Média, identifica os fundamentos das ciências modernas séculos antes da Revolução Científica.