bluuebunny/crossref_metadata_2025 huggingface dataset:
THE USE OF MOODLE IN ENGLISH LANGUAGE LEARNING DURING THE PANDEMIC: THE STUDENTS VOICE
Authors: Maulana Nausa Revy , Lintangsari Alies Poetri
Published: March 2022

During the emergency remote learning, the role of the Learning Management System is significant to support the teaching and learning process. Many universities utilized the Moodle based LMS to assist students and teachers in the teaching and learning process including Universitas Brawijaya that used Virtual Learning Management (VLM). VLM is highly suggested to be used by the lecturers since it can be accessed free as supported by the University, nonetheless, students claimed that the use of VLM is sometimes problematic. To address the students’ voice toward the use of VLM, this research aims to describe the students' attitude towards the use of VLM as an online learning platform. In this research using quantitative methods with a survey design. Instrument used in this study were questionnaires. The questionnaires were adapted according to the works of Srichanyachon (2014), Munasinghe & Wijewardana (2016), and Putri & Sari (2020). There are 100 students participating in this study consisting of 79 female students and 21 male students. The data was analyzed descriptively. This study has similar results to other studies where the use of platforms such as LMS in the COVID 19 era is indispensable and makes it a very effective platform to use. The result of this students’ attitude was a positive attitude with a mean score of 3.58.
THE PROMISING RESPONSIBILITY OF ICT IN TEACHING-LEARNING PROCESS DURING COVID-19
Authors: Allysa Ashley M. Palaming
Published: March 2022

The present paper attempts to analyze the effects of COVID-19 Pandemic on multiple dimensions of human life especially the instructional technologies, the emergence of the role of ICT and other alternative technologies which have provided newer models in Teaching- Learning process gradually supplanting the conventional methods of teaching-learning process. The Nano Architecture Mobile Oriented Digital Institute (NAMODI), specific provisions in the National Education Policy, 2022 regarding ICT and its role in Indian Education system of the new millennia are other important components of the study. Web reports, Academic research, scholarly reviews and articles, recent studies, surveys conducted by the individuals as well as socio-cultural groups and organizations online, academic institutions etc. have been incorporated in the present study to validate the proposed topic. It’s not merely the negative impact of COVID-19, but also a futuristic approach that has ushered due to COVID-19 in the Education system and the pedagogical technologies, has also been included in the paper.
EVALUATION OF WIND POTENTIAL FROM A LOCATION AND LAYOUT OF THE TURBINES
Authors:   ", VIIȘOREANU Alexandru-Marius ,   University POLITEHNICA of Bucharest Faculty of Electrical Engineering", VIIȘOREANU-RĂCHIȚEANU Alina ,   "University POLITEHNICA of Bucharest Faculty of Electrical Engineering"
Published: March 2022

The paper presents a study related to the methodology for evaluating the wind potential of a chosen location, with the help of modern software solutions for analysis and specialized design. The values presented in the study show the differences in the efficiency of wind farms depending on their location, the available input data package and their accuracy being a determining factor in the quality of optimization and design of the wind farm.
ELECTROMECHANICAL CONVERTER FOR ENERGY HARVESTING IN MEDICAL APPLICATIONS
Authors:   ", VELI Yelda ,   University POLITEHNICA of Bucharest Faculty of Electrical Engineering", MOREGA Alexandru M. ,   "University POLITEHNICA of Bucharest, Electrical Engineering Faculty and Institutul de Statistică Matematică și Matematică Aplicată, Academia Română"
Published: March 2022

The paper analyzes an electromechanical converter used to collect the mechanical energy provided by the field of deformation of the walls of an arterial vessel as a result of the pulsating flow of blood through it. The structure of the converter is based on the flow of a strong electrically conductive fluid through channels in the magnetic field provided by the permanent magnets placed concentrically along the device and the arterial vessel, the electric field occurring at the electrodes. Numerical analysis neglects the electrical conductivity of the blood. The device has a wide range of applicability and can be adapted to meet industry requirements.
SOFTWARE MODULE FOR DESIGNING THREE-PHASE ROTARY ELECTRIC MACHINE WINDERS
Authors:   ", CHIRILĂ Aurel-Ionuț ,   University POLITEHNICA of Bucharest Faculty of Electrical Engineering", DEACONU Ioan-Dragoș ,   "University POLITEHNICA of Bucharest Faculty of Electrical Engineering", STĂNCESCU CÎRSTOIU Adelina-Maria ,   "University POLITEHNICA of Bucharest Faculty of Electrical Engineering", BACIU George-Adrian ,   "University POLITEHNICA of Bucharest Faculty of Electrical Engineering", IONESCU Andreea-Roxana ,   "University POLITEHNICA of Bucharest Faculty of Electrical Engineering", POPESCU Sergiu Valentin ,   S.C. ELECTROTEHNICA Echipamente Electrice SA
Published: March 2022

The paper presents a software module developed that allows the design of windings for three-phase alternating current rotary electric machines. Starting from some initial data such as the number of pairs of poles and the number of notches per pole and phase, we obtain the diagram of the three-phase winding with diametric pitch, in a layer and integer number of notches per pole and phase. The program provides the designer in addition to the notched distribution of the coil sides, the relative distribution of the solemnity and the star of the notches.
ON SOME COMPARISON BETWEEN ACCELERATED AGING OF MINERAL OIL UNDER HIGH ELECTRIC FIELD AND HIGH TEMPERATURE
Authors:   ", MANEA Andrei ,   University POLITEHNICA of Bucharest Faculty of Electrical Engineering", DUMITRAN Laurentiu-Marius ,   "University POLITEHNICA of Bucharest Faculty of Electrical Engineering", GORJANU Teodora ,   "University POLITEHNICA of Bucharest Faculty of Electrical Engineering", BORZEA Claudia ,   "University POLITEHNICA of Bucharest Faculty of Electrical Engineering    Romanian Research and Development Institute for Gas Turbines COMOTI "
Published: March 2022

During the operation of electric power transformers,their insulation often made from paper and mineral oil is subjected to thermal, mechanical, and electrical stresses. Therefore, the lifetime of power transformers can be assimilated with their insulation system lifetime. The aim of this paper is to explore and present main degradation aspects for mineral oil, subjected to the action of high electrical field and partial discharge and exposure to thermal stress exclusively, analyzing and pointing out changes in the dielectric properties. Thus, the obtained results indicate that both the thermal and, especially, the electrical stresses produce important variations of the values of the real and imaginary part of the complex relative permittivity, the electrical conductivity, and the loss factor which indicates a severe oil degradation.
Experimental determination of convective heat transfer coefficients of synthetic oil using wilson plot technique
Authors:   Indian Oil Corporation Limited, R&D Centre, Faridabad, Haryana, India, Srivastva U. , Malhotra R. K. , Kumar K. R. , Kaushik S. C.
Published: March 2022

This paper describes the experiments to determine the convective heat transfer coefficients on a synthetic heat transfer fluid flowing in a Shell-and-Tube heat exchanger. The analysis of results is carried out by application of the Wilson plot Technique, on the basis of which, the convective heat transfer coefficients were experimentally obtained for the fluid flowing inside the tube. The convective heat transfer coefficient of oil derived through Wilson plot is then compared with the convective heat transfer coefficients obtained using the classical thermal resistance equation. An empirical correlation between the convective heat transfer coefficient of oil with respect to its mean velocity of flow in the tube and the bulk oil temperature has been proposed. A correction factor of 2.3 and exploration of the exponent value of 0.2 pertaining to the velocity of oil was obtained. The values of convective heat transfer coefficients obtained after applying the correction factor are consistent with the values reported in the literature for oil-water heat transfers. The variation of the heat transfer coefficients at different temperatures is attributed to factors like vapor blanketing effect, surface temperature measurement difficulty as well as dependence of convection phenomenon on surface geometry and physical conditions of the fluids. Experimental results obtained for a temperature range of 50-200°C are extrapolated upto 400°C, the actual upper operational fluid temperatures used in concentrated solar parabolic trough power plant. The test method proposed in this paper can be useful for the development of oil as heat transfer fluids, where already established or commercialized oil is compared with the oil under development, in the same test setup and under similar test conditions.
PSYCHOLOGICAL MOTIVES OF CREATIVITY OF A.S. PUSHKIN AND A.P. CHEKHOV IN THE PERIOD OF EPIDEMICS
Authors:   Samara State University of Social Sciences and Education, Miftakhov I.F. , Gerasimova T.V. ,   Reaviz Medical University
Published: March 2022

This article traces the mutual penetration of the psychological motives of the epidemic, illness - healing, death - immortality, despondency and selflessness on the example of the works and letters of world-famous writers, representatives of the "golden" age of Russian literature - Pushkin and Chekhov. It is shown how the artistic and psychological assessment of the epidemic and diseases differs in the works of Pushkin and Chekhov. Alexander Sergeevich did not completely abandon the ancient Greek interpretation of the psychological perception of the epidemic as God's punishment, but he already suggested the observance of rational anti-epidemic sanitary measures. In "A Feast in the Time of the Plague" an appeal is analyzed for the mobilization of spiritual forces to fight both cholera and psychological despondency - "dangerous fear". The semantic load of the works, first of all, “Sakhalin Islands”, “Wards N6”, etc., has an underlined pathographic nature of the narration and a pronounced medical documentation of the text, which reflects the professional interests of the author. In Chekhov's letters of the "Sakhalin" time, the psychological motives of awareness of one's own fatal illness and the psychological motive of medical duty during the struggle against the smallpox epidemic in Sakhalin, cholera in Melikhovo are intertwined. The psychological motive of awareness of the danger of infection for one's own life and self-sacrifice in order to save people from the epidemic is touched upon. The theme of the psychology of writing duty is covered with the aim of completing the book "Sakhalin Island" and the work of a "cholera doctor", which takes away all physical and spiritual strength.
PROJECT ACTIVITY IN PROFESSIONAL TRAINING OF UNIVERSITY STUDENTS: MODERN ASPECT
Authors:   Samara State Technical University, Chekanushkina E.N. , Kolyvanova L.A. , Chekanushkina E.V. ,   Samara State Social and Pedagogical University,   St. Petersburg State Institute of Culture
Published: March 2022

In modern vocational education, the project competence of future specialists is relevant, as it affects the development of such personality traits in them as creativity, projective thinking, initiative, self-sufficiency, and the ability to solve extraordinary problematic issues. As you know, project activity is an educational technology, one of the main criteria of which is the introduction into social reality of specific goals and objectives of the project, which are distinguished by their novelty and practical significance. In addition, design is a “problem field” for all subjects of the educational process, which is significant in the process of organizing their professional activities in order to create a new type of professional who changes his surrounding reality (environment) and himself in it. Future specialists from various professional fields agree on the high importance of using project technologies during the training period, as they are generally focused on personal development, the formation of professional competencies, motivation for designing their own educational trajectory and career planning. The project technology also makes it possible to update the social initiatives of the individual, aimed at resolving contradictions and presented as a task that needs to be solved.
INTIMACY IN THE DIARY OF N.G. CHERNYSHEVSKY
Authors:   Samara State University of Social Sciences and Education, Buranok O.M. , Ignashov A.V. ,   Limited Liability Company "DLD"
Published: March 2022

The creativity of N.G. Chernyshevsky in his books is presented by his multi-genre character. The article provides an overview of the main literary observations related to the manifestation of the category marked as «intimate» in the diary of Chernyshevsky in 1848-1853. Analyzing the diary as a tool for recording reality and experiences on paper, the authors dwell in detail on the reflection in it of the features revealing the inner world of a young man who is looking for his true self. It was concluded that the awareness of young Chernyshevsky's love experiences, relationships with women determined for the rest of his life his alter ego as a man. The authors come to the conclusion that the rational-analytical method of entries in the diary of N.G. Chernyshevsky prevails even where, it would seem, he should yield to the heart, feeling, impulse. The intimate sphere in Chernyshevsky's diary is connected with logic and reason. On the last pages of the diary, Chernyshevsky writes that the descriptions of events now "will already be next to feelings, reflections, impressions." However, this plan was not carried out, soon the diary entries are cut off forever. The diary clearly proves that the intimacy in the ethical and aesthetic views of N.G. Chernyshevsky was a fundamental part of his worldview, confirmed by all his later life. The theory of rational egoism helped Nikolai Gavrilovich get out of the most confusing situations in his personal life. Awareness of young N.G. Chernyshevsky love experiences, relationships with women determined for the rest of his life his alter ego as a man.
Development of DSTATCOM Optimal Sizing and Location Technique Based on IA-GA for Power Loss Reduction and Voltage Profile Enhancement in an RDN
Authors: Kallon Mohamed Amidu , Nyakoe George Nyauma , Muriithi Christopher Maina
Published: March 2022

The efficiency of electrical distribution systems is being more affected by the increase in voltage drops and power losses. These issues of voltage drop and power loss can be significantly minimized by the incorporation of a Distribution Static Compensator (DSTATCOM) in the distribution network. However, inappropriate positioning and sizing of DSTATCOM can undermine its efficiency. Despite the contributions of many researchers to the optimal placement of DSTATCOM and other compensators in distribution networks, the problems of voltage drop, power losses, and power quality persist, necessitating the need for additional research in this area. In this paper, an innovative technique based on hybridized Immune and Genetic Algorithm (IA-GA) for optimal DSTATCOM placement and sizing for three distinct load levels is proposed. Simulation and analysis of the proposed algorithm were carried out using IEEE-33 bus radial distribution network (RDN) in MATLAB. The simulation results demonstrate a substantial decrease in power loss and a significant improvement in the voltage profile. Evaluation of the proposed method against existing techniques reveals that the proposed technique outperforms IA and PSO in terms of decreasing power loss and enhancement of voltage profiles. A cost-benefit analysis was performed, and it was discovered that the proposed technique yields improved annual cost savings.
Application of Electrodynamic Catalytic Reactors for Intensification of Heat and Mass Exchange Processes of Heterophase Catalysis
Authors: Shulaeva Ekaterina A.
Published: March 2022

This article discusses a model of an electrodynamic reactor. It is fundamentally different in the way of supplying energy to the reaction zone from the reactors currently in operation in industry. This significantly reduces energy consumption, simplifies process control and increases the efficiency of the reactor. The environmental advantage of the developed reactor is also of great importance. There are no emissions of gases into the atmosphere, which are formed in large quantities during fuel combustion in superheating furnaces, the consumption of water is reduced, which is used only in a closed cycle to cool the microwave generator and circulator as a matching load during its operation. The overall efficiency of the electrodynamic reactor is 1.2 times higher than that of existing industrial ones. A method for calculating thermodynamic processes in electrodynamic reactors is proposed. It allows you to determine the technological parameters of the process to ensure a given temperature distribution and provides the maximum yield of the target reaction products with the minimum possible energy consumption of electromagnetic radiation.
Build Real Estate Evaluation Model Based on Customer Requirement After COVID-19
Authors: Huang Wen-Pin , Hung Chih-Hsing
Published: March 2022

In Taiwan, real estate is not only the high price product but also is necessities. Every family needs real estate to live. Maybe, some citizens decide to rent house in the short period. But, major part of citizen will purchase real estate in the future. In past researches, evaluating performance of real estate mainly consider the function and condition of this house such as location, house type, floor, building age etc. However, the demand of specific consumer is importance factors to evaluate the performance of this customer. Especially, the requirement of real estate for consumer has been changed after COVID-19. The goal of this study is to build the evaluation model and relative criteria to evaluate performance of real estate in order to fit with the requirement of specific real estate consumer. A case study is implemented for the reader to realize the proposed method. Sensitive analysis will be executed and proposed method will be compared with traditional multi criteria method to justify the usefulness of this method. Some conclusion and future research will be taken over as ending.
Two-step single-reactor synthesis of oleic acid- or undecylenic acid-stabilized magnetic nanoparticles by thermal decomposition method
Authors: Nahorniak Mykhailo , Pasetto Pamela , Greneche Jean-Marc , Samaryk Volodymyr , Auguste Sandy , Rousseau Anthony , Nosova Nataliya , Varvarenko Serhii
Published: March 2022

Different iron oxides (i.e., magnetite, maghemite, goethite, wüstite) show distinct effects on biological objects, and thus the investigations of the morphology and phase-structural state have prime priority for their biomedical applications.

The aim of this work was to develop one-pot synthesis of magnetic nanoparticles by thermolysis of Fe(III)-oleate or Fe(III)-undecylate in a high-boiling point solvent in situ, using Fe(III)-acetylacetonate. Magnetic nanoparticles were characterized by transmission electron microscopy, dynamic light scattering, thermogravimetric analysis, АТR-FTIR and 57Fe Mössbauer spectroscopy, X-ray diffraction in terms of morphology, hydrodynamic diameter and composition, respectively. The effect of the solvent and unsaturated higher carboxylic acid, used as a reagent and nanoparticles stabilizer, on the particles’ properties was investigated. Synthesis using undecylenic acid led to the formation of iron oxide particles with larger diameter (11-16 nm according to TEM) which were in 75% formed of magnetite. According to the Mössbauer and XRD results, the organic shell thickness around the nanoparticles depended on the nature of the stabilizer, but it did not prevent the partial oxidation of the particles magnetite core to maghemite. In contrast, monodisperse single-domain maghemite nanoparticles with size less than 8 nm were synthesized using oleic acid in 1-octadecene.
Does Departmental Simulation and Team Training Program Reduce Medical Error and Improve Quality of Patient Care? A Systemic Review
Authors:   King Fahad University Hospital - Saudi Arabia, Almulihi Qasem , Shujaa Asaad
Published: March 2022

Review question / Objective: This systematic review aimed to assess whether human simulations or machine stimulations programs would help to prevent medical errors and improve patient safety. Information sources: The search terms “Medical Simulation” [Mesh], “Medication Errors” [Mesh], “Patient safety” [Mesh] were implemented, to be as specific and selective as possible. We searched for all the publications in the Medline database, Web of Science, and Google Scholar from 2000 (when the idea of simulation in healthcare to prevent ME was employed for the first time by the Institute of Medicine (IOM)) to Feb 2022 with only English language-based literature Electronic databases.
Contact High Temperature Strain Automatic Calibration and Precision Compensation Technology
Authors: Jia Zijian , Wang Wenrui , Zhang Jiaming
Published: March 2022

In order to solve the problem of contact high temperature strain precision measure-ment, this paper established an automatic calibration device for high temperature strain gauges. The temperature of the high temperature furnace was automatically con-trolled by the temperature control device. The electric cylinder was driven by the servo motor to apply the load to the calibration beam. The output signal of the high temperature strain gauge, the thermocouple signal and the displacement signal of the grat-ing ruler were collected at the same time. The deformation measurement results obtained after temperature correction were used to calculate the theoretical mechanical strain, which were fed back to control the loading action to complete the automatic calibration process. Based on the above calibration device, the high temperature strain measurement accuracy correction software was developed to calibrate the high temperature strain gauge with multi-parameters, and the curves of sensitivity coefficient, thermal output, zero drift and creep characteristics with temperature were obtained, and a strain measurement accuracy compensation model was established. The high temperature strain measurement experiment was carried out to verify that the modified model can meet the requirements in each temperature range.
A GENÉTICA DO COMPORTAMENTO: TRANSTORNO POR USO DE SUBSTÂNCIAS PSICOATIVAS
Authors: Moreira da Silveira Francis , De Abreu Agrela Rodrigues Fabiano , Oh Henry
Published: March 2022

No decorrer da contemporaneidade diversos tipos de vícios estão sendo estudados pelos especialistas, dentre estes os provocados pelas substâncias psicoativas. Nessa perspectiva, o objetivo principal desta obra é analisar o comportamento e a genética dos usuários que fazem uso das substâncias supra mencionadas. Para esta pesquisa seja realizada de maneira adequada, optou-se por desenvolver uma revisão bibliográfica fundamentada na literatura atual, isto é, em artigos, livros e dissertações que foram escritas no decorrer dos últimos 20 anos. Após a realização da pesquisa a partir das fontes mencionadas anteriormente, foi possível concluirque existe uma relação constante entre as substâncias psicoativas e os vícios. Além disso, tornou-se possível estabelecer um entendimento sobre a genética e os vícios.
Evaluation of Lumbar Myofascial Release Effects on Lumbar Flexion Angle and Pelvic Inclination Angle in Patients with Non-Specific Low Back Pain
Authors: Tamartash, PT, PhD (Candidate) Hassan , Bahrpeyma, PT, PhD Farid
Published: March 2022

Background: Many studies have shown that changes in lumbar flexion angle and the pelvic inclination angle can be affected by the shortening of the lumbar muscles, which can cause low back pain. Decreased lumbar flexion angle and pelvic inclination angle can cause or exacerbate low back pain by disrupting the lumbopelvic rhythm.
Purpose: This study aimed to use myofascial release techniques as a specialized treatment on muscle tissue to cause muscles to reach the optimal length and improve lumbar flexion angle and pelvic inclination angle, and thus improve low-back pain.
Setting: Non-specific low back pain patients, Tarbiat Modares University, Iran.
Participants: 30 chronic non-specific low back pain participants were randomly assigned into two groups.
Research Design: This is a randomized control trial. Interventions: The myofascial release group (n=15) underwent 4 sessions of myofascial release treatment based on Myer’s techniques, and the control group (n=15) underwent 10 sessions of routine electrotherapy for two weeks.
Main Outcome Measures: Before start-ing the intervention and after the last treatment session, both groups were evaluated by the lumbar flexion angle with a flexible ruler, calculating the pelvic inclination angle by a trigonometric formula, and VAS measured the pain score of the participants.
Results: The results of the paired t test showed that, after treatment in both groups, the severity of pain and lumbar flexion angle changed significantly (p ≤ .001). However, the pelvic inclination angle was changed considerably only in the myofascial release group, and we did not see significant changes in the control group (p = .082). Also, the independent sample t test results to examine the between-group changes showed that changes in the myofascial release group were significantly different from the control group (p ≤ .000). Also, the effect size shows the large effect of the myofascial release technique compared to the control group (effect size ≥ 1.85).
Conclusion: The present study results showed that myofascial release techniques in patients with low back pain could help decrease pain intensity and increase lumbar flexion and pelvic inclination angle. Based on the present study results, myofascial release can be a treat-ment to correct posture in patients with chronic non-specific, low back pain. Due to the prevalence of the COVID-19 pandemic, it was not possible to evaluate the long-term effects of treatment.
IS TOO MUCH A GOOD THING? THE NON-LINEAR RELATIONSHIP BETWEEN INTELLECTUAL CAPITAL AND FINANCIAL COMPETITIVENESS IN THE CHINESE AUTOMOTIVE INDUSTRY
Authors: Xu Jian , Liu Feng , Xie Jingci
Published: March 2022

As one of the five largest industries in China, the automotive industry may well become a prosperous market of production and a large consumer market, but with the 2019 novel coronavirus (COVID-19) outbreak, automotive companies have suffered great losses. How to maintain financial competitiveness (FC) through innovation and knowledge after this calamity has become an area of focus for researchers and practitioners. By analyzing listed Chinese automotive companies over the period 2013–2018, the research focus is to determine the non-linear effect of intellectual capital (IC) on FC. IC is measured by the modified Value Added Intellectual Coefficient (MVAIC) model, and FC is measured through a comprehensive index system. The results reveal a cubic relationship between IC and FC. In addition, physical, innovation, and relational capitals have an S-shaped relationship with FC, whereas human capital has an inverted S-shaped curve. The non-linear effect of SC on FC is not significant. It is recommended that managers optimize investment in IC to drive FC in organizations.
Complex Modulation of Rapidly Rotating Young M Dwarfs: Adding Pieces to the Puzzle
Authors: Günther Maximilian N. , Berardo David A. , Ducrot Elsa , Murray Catriona A. , Stassun Keivan G. , Olah Katalin , Bouma L. G. , Rappaport Saul , Winn Joshua N. , Feinstein Adina D. , Matthews Elisabeth C. , Sebastian Daniel , Rackham Benjamin V. , Seli Bálint , J. Triaud Amaury H. M. , Gillen Edward , Levine Alan M. , Demory Brice-Olivier , Gillon Michaël , Queloz Didier , Ricker George R. , Vanderspek Roland K. , Seager Sara , Latham David W. , Jenkins Jon M. , Brasseur C. E. , Colón Knicole D. , Daylan Tansu , Delrez Laetitia , Fausnaugh Michael , Garcia Lionel J. , Jayaraman Rahul , Jehin Emmanuel , Kristiansen Martti H. , Kruijssen J. M. Diederik , Pedersen Peter Pihlmann , Pozuelos Francisco J. , Rodriguez Joseph E. , Wohler Bill , Zhan Zhuchang
Published: March 2022

New sets of young M dwarfs with complex, sharp-peaked, and strictly periodic photometric modulations have recently been discovered with Kepler/K2 (scallop shells) and TESS (complex rotators). All are part of star-forming associations, are distinct from other variable stars, and likely belong to a unified class. Suggested hypotheses include starspots, accreting dust disks, corotating clouds of material, magnetically constrained material, spots and misaligned disks, and pulsations. Here, we provide a comprehensive overview and add new observational constraints with TESS and SPECULOOS Southern Observatory photometry. We scrutinize all hypotheses from three new angles: (1) We investigate each scenario’s occurrence rates via young star catalogs, (2) we study the feature’s longevity using over one year of combined data, and (3) we probe the expected color dependency with multicolor photometry. In this process, we also revisit the stellar parameters accounting for activity effects, study stellar flares as activity indicators over year-long timescales, and develop toy models to simulate typical morphologies. We rule out most hypotheses, and only (i) corotating material clouds and (ii) spots and misaligned disks remain feasible—with caveats. For (i), corotating dust might not be stable enough, while corotating gas alone likely cannot cause percentage-scale features and (ii) would require misaligned disks around most young M dwarfs. We thus suggest a unified hypothesis, a superposition of large-amplitude spot modulations and sharp transits of corotating gas clouds. While the complex rotators’ mystery remains, these new observations add valuable pieces to the puzzle going forward.
Effects of Forcing on Shocks and Energy Dissipation in Interstellar and Intracluster Turbulences
Authors: Cho Hyunjin , Ryu Dongsu , Kang Hyesung
Published: March 2022

Observations indicate that turbulence in the interstellar medium (ISM) is supersonic (M
turb ≫ 1) and strongly magnetized (β ∼ 0.01–1), while in the intracluster medium (ICM) it is subsonic (M
turb ≲ 1) and weakly magnetized (β ∼ 100). Here, M
turb is the turbulent Mach number and β is the plasma beta. We study the properties of shocks induced in these disparate environments, including the distribution of the shock Mach number, M

s
, and the dissipation of the turbulent energy at shocks, through numerical simulations using a high-order, accurate code based on the weighted essentially nonoscillatory scheme. In particular, we investigate the effects of different modes of the forcing that drives turbulence: solenoidal, compressive, and a mixture of the two. In ISM turbulence, while the density distribution looks different with different forcings, the velocity power spectrum, P

v
, on small scales exhibits only weak dependence. Hence, the statistics of shocks depend weakly on forcing either. In the ISM models with M
turb ≈ 10 and β ∼ 0.1, the fraction of the turbulent energy dissipated at shocks is estimated to be ∼15%, not sensitive to the forcing mode. In contrast, in ICM turbulence, P

v
as well as the density distribution show strong dependence on forcing. The frequency and average Mach number of shocks are greater for compressive forcing than for solenoidal forcing; so is the energy dissipation. The fraction of the ensuing shock dissipation is in the range of ∼10%–35% in the ICM models with M
turb ≈ 0.5 and β ∼ 106. The rest of the turbulent energy should be dissipated through turbulent cascade.
Less Than 1% of Core-collapse Supernovae in the Local Universe Occur in Elliptical Galaxies
Authors: Irani I. , Prentice S. J. , Schulze S. , Gal-Yam A. , Teffs Jacob , Mazzali Paolo , Sollerman J. , Gonzalez E. P. , Taggart K. , De Kishalay , Fremling Christoffer , Perley Daniel A. , Strotjohann Nora L. , Kasliwal Mansi M. , Howell A. , Dhawan S. , Tzanidakis Anastasios , Hiramatsu Daichi , Kool Erik C. , Anderson J. P. , Müller-Bravo T. E. , Dekany Richard , Gromadzki Mariusz , Carini Roberta , Galbany L. , Drake Andrew J. , Burke Jamison , Pellegrino Craig , Della Valle Massimo , Medford Michael S. , Rusholme Ben , Young D. R. , Gutiérrez Claudia P. , Inserra Cosimo , Omer Rafia , Shupe David L. , Chen T.-W. , Shin Kyung Min , Yaron Ofer , McCully Curtis , Nicholl Matt , Riddle Reed
Published: March 2022

We present observations of three core-collapse supernovae (CCSNe) in elliptical hosts, detected by the Zwicky Transient Facility Bright Transient Survey (BTS). SN 2019ape is a SN Ic that exploded in the main body of a typical elliptical galaxy. Its properties are consistent with an explosion of a regular SN Ic progenitor. A secondary g-band light-curve peak could indicate interaction of the ejecta with circumstellar material (CSM). An Hα-emitting source at the explosion site suggests a residual local star formation origin. SN 2018fsh and SN 2020uik are SNe II which exploded in the outskirts of elliptical galaxies. SN 2020uik shows typical spectra for SNe II, while SN 2018fsh shows a boxy nebular Hα profile, a signature of CSM interaction. We combine these 3 SNe with 7 events from the literature and analyze their hosts as a sample. We present multi-wavelength photometry of the hosts, and compare this to archival photometry of all BTS hosts. Using the spectroscopically complete BTS, we conclude that

0.3

%

−
0.1

+
0.3

of all CCSNe occur in elliptical galaxies. We derive star formation rates and stellar masses for the host galaxies and compare them to the properties of other SN hosts. We show that CCSNe in ellipticals have larger physical separations from their hosts compared to SNe Ia in elliptical galaxies, and discuss implications for star-forming activity in elliptical galaxies.
On the Application of Differential Evolution to the Analysis of X-Ray Spectra*
Authors: Kępa Anna , Sylwester Barbara , Siarkowski Marek , Sylwester Janusz
Published: March 2022

Using methods of differential evolution (DE), we determined the coronal elemental abundances and the differential emission measure (DEM) distributions for the plasma flaring on 2003 January 21. The analyses have been made based on RESIK X-ray spectra. DE belongs to the family of evolutionary algorithms. DE is conceptually simple and easy to implement, so it has been applied to solve many problems in science and engineering. In this study we apply this method in a new context: simultaneous determination of plasma composition and DEM. In order to increase the confidence of the results obtained using DE, we tested the use of its algorithms by comparing the DE synthesized with respective spectra observed by RESIK. Extensive discussion of the DE method used and the obtained physical characteristics of flaring plasma is presented.
Host Dark Matter Halos of SDSS Red and Blue Quasars: No Significant Difference in Large-scale Environment
Authors: Petter Grayson C. , Hickox Ryan C. , Alexander David M. , Geach James E. , Myers Adam D. , Rosario David J. , Fawcett Victoria A. , Klindt Lizelke , Whalen Kelly E.
Published: March 2022

The observed optical colors of quasars are generally interpreted in one of two frameworks: unified models that attribute the color to the random orientation of the accretion disk along the line of sight, and evolutionary models that invoke connections between quasar systems and their environments. We test these schemas by probing the dark matter halo environments of optically selected quasars as a function of g − i optical color by measuring the two-point correlation functions of ∼0.34 million eBOSS quasars as well as the gravitational deflection of cosmic microwave background photons around ∼0.66 million XDQSO photometric quasar candidates. We do not detect a trend of halo bias with optical color through either analysis, finding that optically selected quasars at 0.8 < z < 2.2 occupy halos of characteristic mass M

h
∼ 3 × 1012
h
−1
M
⊙ regardless of their color. This result implies that a quasar’s large-scale halo environment is not strongly connected to its observed optical color. We also confirm the findings of fundamental differences in the radio properties of red and blue quasars by stacking 1.4 GHz FIRST images at their positions, suggesting the observed differences cannot be attributed to orientation. Instead, the differences between red and blue quasars likely arise on nuclear-galactic scales, perhaps owing to reddening by a nuclear dusty wind. Finally, we show that optically selected quasars’ halo environments are also independent of their r − W2 optical–infrared colors, while previous work has suggested that mid-infrared-selected obscured quasars occupy more massive halos. We discuss the implications of this result for models of quasar and galaxy coevolution.
Probing the Icy Shell Structure of Ocean Worlds with Gravity–Topography Admittance
Authors: Akiba Ryunosuke , Ermakov Anton I. , Militzer Burkhard
Published: March 2022

The structure of the icy shells of ocean worlds is important for understanding the stability of their underlying oceans as it controls the rate at which heat can be transported outward and radiated to space. Future spacecraft exploration of the ocean worlds (e.g., by NASA’s Europa Clipper mission) will allow for higher-resolution measurements of gravity and shape than currently available. In this paper, we study the sensitivity of gravity–topography admittance to the structure of icy shells in preparation for future data analysis. An analytical viscous relaxation model is used to predict admittance spectra given different shell structures determined by the temperature-dependent viscosity of a tidally heated, conductive shell. We apply these methods to the ocean worlds of Europa and Enceladus. We find that admittance is sensitive to the mechanisms of topography support at different wavelengths and estimate the required gravity performance to resolve transitions between these mechanisms. We find that measuring admittance would be complementary to ice-penetrating radar in constraining shell thickness as it would cover the cases for which a direct ice–ocean interface detection is less favorable with radar, i.e., for warmer and thicker shells. Finally, we find that admittance may be used to constrain the tidal dissipation within the icy shell, which would be complementary to a more demanding measurement of the tidal phase lag.
Nursing Students’ Perceptions and Acceptance of Online Learning during the COVID-19 Pandemic in Indonesia
Authors: Pramana Cipta , Handayani Oktia Woro Kasmini , Raharjo Tri Joko , Rahayu Sri Ratna
Published: March 2022

BACKGROUND: The COVID-19 pandemic has changed the order of life in various aspects of life, including the field of education in Indonesia. 
AIM: The purpose of the study was to determine student perceptions and acceptance of the online learning process during the COVID-19 pandemic.
METHODS: The research is in the form of a survey using Google Forms about the perception and acceptance of online lectures during the COVID-19 pandemic for nursing students at universities in Indonesia, a questionnaire sent via Whatsapp. Held from July 1, 2021, to July 30, 2021.
RESULTS: The many of respondents aged 17-19 years (50%) with a Diploma-students (62.9%). Most of them have intermediate-level skills in using information technology (82.2%). The platform that is often used is Zoom meeting. While other platforms are Whatsapp and Edmodo. The advantages of online learning are that students state that they can study from home (22.2%) and easily access online sources of material (19.9%) and can obtain recordings of each lesson (18.6%). Constraints that are often faced are technical problems (24.6%), very minimal interaction with lecturers (18.4%) and very minimal interaction between students (17.5%). Age and skills in using technology, information, and communication have a significant effect on students' perceptions of online learning (p<0.05). Most respondents have a negative perception (52.2%) about online learning.
CONCLUSION: Although there are several advantages to online learning, students' perceptions of the learning process are negative, meaning that they are happier and still want face-to-face learning.
How Do They Feel at the First Line During the Covid Outbreak: A Survey among Indonesian Nurses
Authors: Putra Ardia , Yuswardi Yuswardi , Nurhasanah Nurhasanah
Published: March 2022

AIM: This descriptive survey study is conducted to examine the nurses’ perceived occupational safety as a front line during the pandemic period in Aceh Province, Indonesia

METHODS: This research used a cross-sectional study design. The study was conducted in all districts/cities in the Aceh province. Sample in this study amounted to 199 respondents, collected using a snowball sampling technique. The developed questionnaire consists of respondents’ demographic data and Nurse Occupational Safety Questionnaire, and it has been tested for validity and reliability tests. Data were collected using web-based questionnaires (google form) via appointed representatives responsible for sharing the questionnaire link. Then, data were analyzed using the descriptive statistic by using SPSS software.

RESULTS: This study found that 126 respondents (63.3%) perceived safe and 73 respondents (33.7%) felt the unsafe conditions in working during pandemic in Aceh. Factors contributed to this result are included age (p = 0.029), educational level (p = 0.003), and work setting (p = 0.000).

CONCLUSION: Feeling unsafe by nurses can be assumed by the incidence rate of nurses becoming infected by the Severe Acute Respiratory Syndrome-Coronavirus-2 virus has reached 60.3% for the respondent. Therefore, the stakeholders, including the Government, Health Service Management, Hospital Management, and other health agencies, must take responsibility for this situation, especially in monitoring and evaluating the performance and needs of nurses who direct and indirectly treat the coronavirus disease 2019 patients.
First population-level study of the ammonite genus Hildoglochiceras Spath, and the Lower Tithonian record of the Hildoglochiceras Horizon in the Kachchh Basin, India
Authors: Pandey Dhirendra Kumar , Fürsich Franz T. , Alberti Matthias , Das Ranajit , Olóriz Sáez Federico
Published: March 2022

AHildoglochiceras-rich horizon is reported from a thin carbonate intercalation within the siliciclastic Upper Jurassic Jhuran Formation of the Jara Dome, western Kachchh Mainland. TheHildoglochicerasspecimens have been used for the first population-level study of the genus based on a multivariate analysis. High phenotype instability in the large sample confirms the occurrence of transient forms between morphospecies. Key morphological traits for interpretingHildoglochicerasare stated, and the morphospeciesHildoglochiceras kobelli(Oppel) andH. kobelliforme(Bonarelli) are interpreted as a dimorphic pair. The ammonite-rich level is interpreted as a Hildoglochiceras Horizon, which is related to a transgressive pulse and maximum flooding zone interrupting largely restrictive conditions for ammonites. The endemic character ofHildoglochicerasis confirmed and related to its environmental restriction to shelf areas on the palaeomargins of the Trans-Erythraean Trough. A comprehensive review of biostratigraphic interpretations ofHildoglochicerasshows the influence of natural and experimental forcing factors. The uppermost Kimmeridgian to lowermost Upper Tithonian interval is the widest biostratigraphic range assumable forHildoglochicerasbased on existing reports, but most probably it was restricted to, or at least better represented in, Lower Tithonian horizons. The Hildoglochiceras Horizon described here is correlated with a lower part of the Albertinum/Darwini Zone in the Secondary Standard Scale for ammonite-based bio-chronostratigraphy in European and West-Tethyan areas. According to the current state of knowledge, a local rather than wide regional significance is favoured forHildoglochicerasrecords before its significance for precise correlation across the Trans-Erythraean Trough.
La mise en place d’un drive dans la grande distribution à l’épreuve d’un jeu de logiques institutionnelles
Authors: Juteau Solène
Published: March 2022

À la création d’une activité organisationnelle adossée aux technologies numériques, la transposition de la logique de l’organisation préexistante pourrait être une évidence. Cette recherche se propose d’en analyser la situation au sein d’un service de retrait de commandes de type Drive dans la Grande Distribution à partir de son lancement. Nous recherchons comment se déploie un jeu de logiques institutionnelles à l’adoption d’une innovation organisationnelle dans une organisation préexistante ? Pour y répondre, nous avons mené une étude interprétative fondée sur un cas unique. Nous avons élaboré une collecte de données combinant données primaires avec des entretiens semi-directifs et données secondaires avec des observations et des analyses documentaires. Les résultats de l’étude nous permettent de caractériser un modèle processuel en trois phases, précisant les conditions d’émergence de nouvelles modalités organisationnelles et institutionnelles. Codes JEL : O330, M150, L20
Stability and bifurcation analyses of p53 gene regulatory network with time delay
Authors: Hou Jianmin , Liu Quansheng , Yang Hongwei , Wang Lixin , Bi Yuanhong
Published: March 2022

In this paper, based on a p53 gene regulatory network regulated by Programmed Cell Death 5(PDCD5), a time delay in transcription and translation of Mdm2 gene expression is introduced into the network, the effects of the time delay on oscillation dynamics of p53 are investigated through stability and bifurcation analyses. The local stability of the positive equilibrium in the network is proved through analyzing the characteristic values of the corresponding linearized systems, which give the conditions on undergoing Hopf bifurcation without and with time delay, respectively. The theoretical results are verified through numerical simulations of time series, characteristic values and potential landscapes. Furthermore, combined effect of time delay and several typical parameters in the network on oscillation dynamics of p53 are explored through two-parameter bifurcation diagrams. The results show p53 reaches a lower stable steady state under smaller PDCD5 level, the production rates of p53 and Mdm2 while reaches a higher stable steady state under these larger ones. But the case is the opposite for the degradation rate of p53. Specially, p53 oscillates at a smaller Mdm2 degradation rate, but a larger one makes p53 reach a low stable steady state. Besides, moderate time delay can make the steady state switch from stable to unstable and induce p53 oscillation for moderate value of these parameters. Theses results reveal that time delay has a significant impact on p53 oscillation and may provide a useful insight into developing anti-cancer therapy.