bluuebunny/crossref_metadata_2025 huggingface dataset:
The Effect of Sudden Weight Loss During Competitions For Young Weightlifters in (RMR) and the Concentration of (Sodium-Potassium) Salts in the Blood
Authors: Natiq Abdulrahman Werytha Allami  , Waritha Al-Lami
Published: November 2021

The study aimed to identify the level of the weight difference between young weightlifters when a suddendrop occurred during the competition period, to identify the level of (RMRF) difference in the concentrationof salts (sodium - potassium) in their blood during this period, and to identify the effect, relationshipand contribution of sudden weight loss during this period. The period of competition in (RMR) and theconcentration of (sodium potassium-) salts in their blood, and they adopted the descriptive method ofrelational relations on weightlifting youth (18) - 20 years under the weight category 69 kg were chosenrandomly and (20) weight lifter, as That the number of those who lost weight unapproved is (12) weightliftersmake up the percentage (22.917%) from the origin of their community. Fitmate pro) at rest time after weightloss, at rest time after weight loss, and withdrawing (5 cc) of blood every before and after intentional weightloss to measure sodium and potassium cytokine by laboratory examination, and the researcher verified thatthe data were processed by the cyst system Statistical Abstract (SPSS) for conclusions and extrapolationsBikat that the process of sudden weight loss is associated with a negative relationship in the level of (RMR)and the concentration of salts (sodium - potassium) in the blood, and affects and contributes to reducing thelevels of young Al Rafi’i for weightlifting during the competition period, and it is necessary to nurture thecoaches to support the culture of the ideal weight and the true athlete of the youth of Al Rafei to lift Weights,as can be the coaches who influence them a lot. To prevent sudden weight loss disorder, they should reducethis phenomenon, which can easily cause eating disorders, as can those in charge of men’s tournaments.Agement at the local weightlifting association and its training, providing advice to the youth eye class on theunhealthy DONC weight loss, if there are no other professionals who can intervene (physiologists, doctors ...and others), it is necessary for the basic trainers to have the information. Correct information about the risksof eating disorders in sport and to be fully aware of the symptoms and consequences, to be able to act andbuild a level of preventive discoveries for the relevant predictions and to take the necessary steps when theseproblems arise, and whoever learns adequately about nutrition supervises the diet and gives Lempid tips toreduce Weight healthily for the prevention and treatment of eating disorders and counseling (for example,when an athlete needs to lose a kilo or more of body weight).
Effectiveness of Antenatal Educational Guidelines on Maternity Nurse’s Performance
Authors: Samah Abd Elhaleim Said  , Amira Mohammed Salama  , Hemmat Mostafe Elbana
Published: November 2021

Antenatal care is a detailed, systematic examination and follow-up of pregnant female that includeseducation, counseling, monitoring and therapy to address and treat minor issues and provide appropriatescreening during pregnancy. Aim of the study: Evaluate Antenatal education guidelines’ effectivenesson maternity nurses’ performance (Knowledge and Practice). Design: A quasi-experimental design (pretest-post-test). Setting: study was conducted in obstetric skill lab of faculty of nursing, Benha university .Sample: A purposive sample was used to recruit 140 maternity nurses from Maternal and child health centersat kalioubia governorate.. Tools: two data collection tools: A self-administered questionnaire sheet and anobservational practice checklist. Results: Highly statistically significant improvement in maternity nurse’sknowledge score, it changed from 51.4% to 85% at post-intervention. Maternity nurses’ practice mean scorewas satisfactory improved, as the mean score increased from 56.4% to 82.1% at the post-intervention phase.Highly positive correlation between total nurse’s knowledge and practice score regarding antenatal carewas found. Conclusion: Provision of antenatal educational guidelines helped strengthen the awareness andpractice of maternity nurses on the various aspects of the antenatal period. Recommendations: The care ofpregnant women should be an integral part of the educational curriculum for nursing students.
“By order of His Majesty the King”: The Painter-Restorers of the Art Collection of Ferdinand II of Portugal
Authors: Mariz Vera
Published: November 2021

This study reveals and discusses the role played by five painter-restorers – António Manuel da Fonseca, António Tomás da Fonseca, Carl Kathan, Gaetano Marmocchi, and Étienne Le Roy – at the service of King Ferdinand II of Portugal, from 1850 to 1864. It draws on a dataset of more than one hundred and fifty restored paintings, used here as evidence of the painter-restorers’ activity and versatility in the private art market, as well as of the king’s commitment to managing, repairing and preserving his collection of paintings. Ultimately, by identifying the paintings that have been restored by order of the “Artist King” and relating them to the restorers, this research opens the door for direct analyses and a more precise characterization of the methods and techniques used by these painter-restorers in 19th century Europe.
The Multiple Object Avoidance (MOA) task measures attention for action: Evidence from driving and sport
Authors: Mackenzie Andrew K. , Vernon Mike L. , Cox Paul R. , Crundall David , Daly Rosie C. , Guest Duncan , Muhl-Richardson Alexander , Howard Christina J.
Published: November 2021

Performance in everyday tasks, such as driving and sport, requires allocation of attention to task-relevant information and the ability to inhibit task-irrelevant information. Yet there are individual differences in this attentional function ability. This research investigates a novel task for measuring attention for action, called the Multiple Object Avoidance task (MOA), in its relation to the everyday tasks of driving and sport. The aim in Study 1 was to explore the efficacy of the MOA task to predict simulated driving behaviour and hazard perception. Whilst also investigating its test–retest reliability and how it correlates to self-report driving measures. We found that superior performance in the MOA task predicted simulated driving performance in complex environments and was superior at predicting performance compared to the Useful Field of View task. We found a moderate test–retest reliability and a correlation between the attentional lapses subscale of the Driving Behaviour Questionnaire. Study 2 investigated the discriminative power of the MOA in sport by exploring performance differences in those that do and do not play sports. We also investigated if the MOA shared attentional elements with other measures of visual attention commonly attributed to sporting expertise: Multiple Object Tracking (MOT) and cognitive processing speed. We found that those that played sports exhibited superior MOA performance and found a positive relationship between MOA performance and Multiple Object Tracking performance and cognitive processing speed. Collectively, this research highlights the utility of the MOA when investigating visual attention in everyday contexts.
Efficient synthesis of ethyl 2-(oxazolin-2-yl)alkanoates via ethoxycarbonylketene-induced electrophilic ring expansion of aziridines
Authors: Lei Yelong , Xu Jiaxi
Published: November 2021

Alkyl 2-diazo-3-oxoalkanoates generate alkoxycarbonylketenes, which undergo an electrophilic ring expansion with aziridines to afford alkyl 2-(oxazolin-2-yl)alkanoates in good to excellent yields under microwave irradiation. The method can be also applied in the synthesis of 2-(oxazolin-2-yl)alkanamides and 1-(oxazolin-2-yl)alkylphosphonates.
Do Black-Owned Banks Substitute for Payday Lenders? An Exploratory Study
Authors: Barth James R. , Cebula Richard J. , Xu Jiayi
Published: November 2021

The annualized interest rate charged on payday loans can reach 1,950 percent, whereas similar rates charged by banks are typically less than 25 percent. Also, persons borrowing from payday lenders and paying the higher interest rates are disproportionately lower-income Blacks. This provides an incentive for Blacks seeking loans to turn to banks rather than payday lenders. This may be more likely to happen when there are Black-owned banks in communities with greater percentages of Blacks. Indeed, offices of such banks may substitute for payday loan stores, providing a greater opportunity for Blacks to avoid the higher interest rates associated with payday lenders. We hypothesize that to the extent Black-owned banks substitute for payday there is a greater opportunity for lower-income Blacks to substitute/switch firms and thereby seek lower-cost loans. We do find that there are significantly fewer payday loan stores in counties where there are more Black bank offices.
Features of application of knowledge management to ensure competitiveness of the enterprise
Authors: PETRYSHYN Nataliia , YAREMCHUK Tetiana
Published: November 2021

Introduction. Today, in the era of intellectualization of the economy, knowledge is one of the most important assets and factors that forms the value of the organization. In this case, the main thing is not the creation of knowledge, but its productive use. Today, no one doubts that the future of a company depends on its ability to manage knowledge. Therefore, domestic enterprises (both private and public) need to implement a knowledge management system, learn to effectively manage knowledge and use it productively.
The purpose of the paper is to study the main problems of knowledge management in modern organizations, provide recommendations for the development of effective knowledge management technology, quantitative assessment of the level of knowledge in the enterprise and knowledge management strategies.
Results. In today's conditions, knowledge management in the enterprise is accompanied by a number of problems. To decide some of them, the authors proposed a knowledge management technology, which is based on improving the level of knowledge and business qualities of managers through the introduction of an appropriate bonus system. In order to determine the level of knowledge of managers, it is proposed to use specific indicators. In knowledge management, the use of the following strategies is recommended: knowledge formation, knowledge exchange, intellectual capital management and business knowledge strategy. At the enterprise it can be implemented both separately and simultaneously by introducing information systems, staff development, creation of intellectual capital, etc.
Conclusion. The proposed recommendations on knowledge management technology and indicators for quantifying the knowledge of managers will allow us to determine the required number of managers, the size of their salaries and bonuses, as well as calculate the effect and effectiveness of their management activities. Based on this, the company will be able to increase the level of knowledge of its employees and operate more successfully. The implementation of the knowledge management strategies proposed by the authors will help the company achieve its goals in the field of knowledge management and ensure its competitiveness.
Formation of the enterprise financial resources management conceptual model in the process of foreign economic activity implementation
Authors: BORTNIKOVA Mariana , CHYRKOVA Yuliia
Published: November 2021

Introduction. While carrying out production, economic and foreign economic activities, domestic enterprises face important issues of ensuring their financial stability and effective management of the financial resources’ formation, distribution and use process.
The purpose of the paper is to build a conceptual model for managing the financial resources of an enterprise in the implementation of foreign economic activity, which will allow for high-quality diagnostics of financial resources at the stages of their formation, distribution and use.
Results. The influence of globalization processes on the functioning of domestic business entities provides for a periodic renewal of the mechanism and model for financial resources management. The main constituent elements of the model for managing the enterprise financial resources are characterized, namely: the aim and main objectives; subjects of financial resources management; technology of financial resources strategic management at the enterprise; factors of influence on the management processes and the system of ensuring the financial resources management of the enterprise in the implementation of foreign economic activity. The technology of the company's financial resources strategic management has been developed. A conceptual model for managing the financial resources of an enterprise in the implementation of foreign economic activity has been formed, which considers organizational, functional and information support.
Conclusion. The application of the financial resource management conceptual model in the practical activities of enterprises will ensure the achievement of the goals and objectives of the enterprise, contribute to the improvement of its financial condition and the movement of financial flows, as well as allow alternative management decision-making on the formation and implementation of the strategy for managing the financial resources of the enterprise in the conditions of new foreign markets development.
Features of motivation of employees of enterprises with the use of tools of professional growth
Authors: HANAS Liubov , HAIOVA Sofiia
Published: November 2021

Introduction. On the modern stage of intensive development of economy and technologies the problem of providing of professional increase of personnel appears before enterprises, as an environment began to develop very dynamically and in order that an enterprise doesn’t find oneself on the finishing stage of the life cycle, human capitals must similarly dynamically develop.
The purpose of the paper is development of model of realization of inwardly-organizational studies.
Results. In the article the model of construction of inwardly-organizational studies of workers of enterprise is developed and graphically represented. The features of the offered model of realization of studies of employees is that every leader works not with a separate worker, but with a group. The primary purposes of studies are development of workers, perfection of communicative skills due to work in a team. An educational program must be flexible. SHE at a necessity is adapted to the concrete situation. An educational process needs to be built on communications, exchange information, taking into account the features of relations between employees. It is necessary to involve qualified and creative employees of the enterprise in the process of personnel training.
Important aspects of professional development of staff are the establishment of feedback between the employee and the management service and determining the sequence of organization of the staff training process. It is also not necessary to carry out internal training for the sake of the learning process itself. The purpose of internal training should be to improve skills and exchange experiences between employees.
The main forms of training are online, offline and blended seminars, meetings on the analysis of situations and goals that are a priority for the company at a particular time and the approval of the main tasks for each individual employee.
Conclusions. Conducting internal organizational training is a very effective tool for motivating employees in enterprises. In the initial stages of the implementation of internal training, subordinates may resist such innovations. Therefore, to implement this management decision, managers need to prepare the team in advance. However, after at least one cycle of training, the results will be noticeable.
The legal regulation of exchange agricultural products in Ukraine: the current situation and the prospects of development
Authors: TURCHYN Nataliia , KRAVETS Liudmyla , STEPANOV Kyrylo
Published: November 2021

Introduction. The resource potential of Ukraine in the formation of supply of high quality agricultural products gives grounds to assert its importance in the world market.
The purpose of the paper is explores the question the current state and prospects for the development of the legal framework for the organization of exchange trade in agricultural products in Ukraine. Laws, regulations, concepts related to exchange activities are considered.
Results. The author defines the concepts, types and features of the organization and functioning of commodity exchanges in Ukraine; found out the benefits of stock trading; the agrarian exchange isdistinguished and characterized. The article analyzes the actsof economic legislation in the sphere of regulation of the stock exchange trade in agricultural products in Ukraine, identifies its main shortcomings and gaps. The development and place of the agrarian exchange among domestic commodity exchanges are analyzed, the main reasons of inefficient functioning of the agrarian exchange are revealed and concrete measures for overcoming inefficient functioning of the agrarian market are offered. The main task of agricultural exchanges is to provide services in concluding exchange agreements on agricultural products, identifying commodity prices, demand and supply of agricultural products. It is substantiated that with the help of the exchange trade mechanism conditions are created for the formation of the fairest market price for agricultural products, which determines the prospects of the exchange trade mechanism in Ukraine and the world.
Conclusion. The analysis of the current state of legal regulation and the system of organization of exchange trading in agricultural products in Ukraine leads to a conclusion that in Ukraine at the present stage of development there is no proper system for the organization of stock exchange trading in agricultural products, which is caused by the shortcomings of the economic legislation in the field of legal regulation of stock exchange trade in agricultural products in Ukraine systematic legal mechanism and insufficient efficiency of stock exchange infrastructure. The article presents the necessity of elaboration of the state concept of development of exchange trading in agricultural products in Ukraine, expansion of exchange infrastructure, introduction of electronic system of exchange trading, further development of Ukraine and integration to the world financial system.
Dual education in Ukraine: from legal support to implementation problems
Authors: MAHOMEDOVA Alina , POHORIELOVA Oleksandra
Published: November 2021

The current situation in the labor market makes it necessary to solve the issues related to providing its employees with the appropriate level of knowledge and skills that would meet the requirements stipulated for young professionals by their employers, therefor the issue of introducing a dual form of education is relevant.
The purpose of the paper is to study the problematic issues that arise in the course of introduction of the dual form of education in higher education establishment and state of legislation regulating these issues.
The paper analyzes the issues related to the decline in confidence in higher education, provides data on the admission campaign for the applicants of Taras Shevchenko National University of Kyiv. The need for the introduction of a dual form of education is justified, including data on the interest of students in this form of education. The authors of the paper analyze the current legislation on the regulation of dual education, in particular, identify the need for amendments to be made in the regulations, first of all, need to consider the issue of improving labor legislation, namely regulation of labor relations between employee (the person studying) and employer under the time of obtaining a dual form of education and establishing a number of guarantees for such employees. The term "labor function" should be introduced in labor legislation and should be based on a competency-based approach, as well as guaranteeing the right to remuneration of employees, who study according to a dual form of education. Yet, there is a need to continue the implementation of the Government Concept for implementation of dual education. The authors of the paper also cover and analyze a number of issues that arise in the course of implementation of the dual form of education: organizational, educational and methodological and psychological.
Diagnostic and prognostic value of miRNAs in hepatoblastoma: A systematic review with meta-analysis
Authors:   Soochow university, Wu Bin , Guo Lixia , Zhen Kaikai , Sun Chao
Published: November 2021

Review question / Objective: Background and aim: Increasing evidence has revealed the valuable diagnostic and prognostic applications of dysregulated microRNAs (miRNAs) in hepatoblastoma (HB), the most common hepatic malignancy during childhood. However, these results are inconsistent and remain to be elucidated. In the present study, we aimed to systematically compile up-to-date information regarding the clinical value of miRNAs in HB. Methods: Articles concerning the diagnostic and prognostic value of single miRNAs for HB were searched from databases. The sensitivity (SEN), specificity (SPE), positive and negative likelihood ratios (PLR and NLR), diagnostic odds ratio (DOR), area under the curve (AUC), and hazard ratios (HRs) were separately pooled to explore the diagnostic and prognostic performance of miRNA. Subgroup and meta-regression analyses were further carried out only in the event of heterogeneity. Results: In all, 20 studies, involving 264 HB patients and 206 healthy individuals, met the inclusion criteria in the six included literature articles. For the diagnostic analysis of miRNAs in HB, the pooled SEN and SPE were 0.76 (95% CI: 0.72–0.80) and 0.75 (95% CI: 0.70–0.80), respectively. Moreover, the pooled PLR was 2.79 (95% CI: 2.12–3.66), NLR was 0.34 (95% CI: 0.26–0.45), DOR was 10.24 (95% CI: 6.55–16.00), and AUC was 0.83, indicating that miRNAs had moderate diagnostic value in HB. For the prognostic analysis of miRNAs in HB, the abnormal expressions of miR-21, miR-34a, miR-34b, miR-34c, miR-492, miR-193, miR-222, and miR-224 in patients were confirmed to be associated with a worse prognosis. The pooled HR was 1.74 (95% CI: 1.20–2.29) for overall survival (OS) and 1.74 (95% CI: 1.31–2.18) for event-free survival (EFS), suggesting its potential as a prognostic indicator for HB. Conclusion: To the best of our knowledge, this is the first comprehensive systematic review and meta-analysis that examines the diagnostic and prognostic role of dysregulated miRNAs in HB patients. The combined meta-analysis results supported the previous individual finds that miRNAs might provide a new, noninvasive method for the diagnostic and prognostic analyses ofHB.
A new species of the genus Otiorhynchus Germar, 1822 (Coleoptera: Curculionidae) from South-eastern Altai
Authors: Legalov Andrei A.
Published: November 2021

A new species, Otiorhynchus (Mongolorrhynchus) altaipilosus Legalov, sp. nov. from South-eastern Russian Altai of Western Siberia is described and illustrated. This species is similar to O. populiger Arnoldi, 1975 from Bayankhongor Province but differs from it in small teeth on the femora, the length of the rostrum is subequal to its width at the base, wider elytra, and the rugose-punctate pronotum. A distribution map for O. altaipilosus Legalov, sp. nov. and O. populiger is given.
Antioxidant and anti-hemolytic activities of different parts (leaves, stems and heart) of the artichoke (Cynara scolymus L) cooked with different methods in west Algeria
Authors: Lineda Bekkouche  , Ouafa Abba  , Nawal Dida  , Djamil Krouf  , Farida Boukortt
Published: November 2021

This study was undertaken to estimate antioxidant and anti-hemolytic activi-ties of different parts (leaves, stem and heart) of the artichoke (Cynara scoly-mus L) cooked with different methods. The leaves, stems and hearts were used either raw or cooked according to four cooking methods: evaporated, boiled, oven-baked and sautéed. On the different extracts prepared from artichoke parts (raw or cooked), total polyphenols and flavonoids contents, anti-oxidant and anti-hemolytic activities were evaluated. According to the four cooking methods, the polyphenol and flavonoids contents of baked leaves were the highest. Polyphenol contents were higher in boiled stems while flavonoids contents were elevated in evaporated stems. Evaporated and boiled hearts exhibited the best polyphenols and flavonoids contents. The three parts of the artichoke had a scavenger effect against the DPPH radical and baked leaves showed the higher activity compared to raw leaves. The evaporated, sautéed and boiled cooking modes indicated reduced H2O2 entrapment activity by 41%, 42% and 37%, respectively compared to raw artichoke. In addition, cooked hearts had reduced H2O2 trapping activity compared to the raw heart. Compared to raw products, NO trapping activity increased in sautéed leaves and hearts while this activity was smaller in boiled leaves, stems and hearts. Boiled and sautéed leaves increased the percentage of inhibition of hemolysis of human erythrocyte by 68% and 65%, respectively, compared to raw leaves. The present results demonstrated that common cooking methods applied to artichoke have increased the nutrition-al quality of this vegetable and that effect depends upon the vegetable part.
No Sub-Saturn-mass Planet Desert in the CORALIE/HARPS Radial-velocity Sample
Authors: Bennett David P. , Ranc Clément , Fernandes Rachel B.
Published: November 2021

We analyze the CORALIE/HARPS sample of exoplanets found by the Doppler radial-velocity method for signs of the predicted gap or “desert” at 10–100 M
⊕ caused by runaway gas accretion at semimajor axes of <3 au. We find that these data are not consistent with this prediction. This result is similar to the finding by the MOA gravitational microlensing survey that found no desert in the exoplanet distribution for exoplanets in slightly longer period orbits and somewhat lower host masses (Suzuki et al. 2018). Together, these results imply that the runaway gas accretion scenario of the core accretion theory does not have a large influence on the final mass and semimajor axis distribution of exoplanets.
New Galactic β Lyrae-type Binaries Showing Superorbital Photometric Cycles
Authors: Rojas García Gonzalo , Mennickent Ronald , Iwanek P. , Gorrini P. , Garcés J. , Soszyński I. , Astudillo-Defru N.
Published: November 2021

We present the discovery of 32 new double periodic variables (DPVs) located toward the Galactic bulge. We found these objects among the nearly half a million binary stars published by the Optical Gravitational Lensing Experiment project. With this discovery, we increase the number of known DPVs in the Milky Way by a factor of 2. The new set of DPVs contains 31 eclipsing binaries and one ellipsoidal variable star. The orbital periods cover the range from 1.6 to 26 days, while long periods are detected between 47 and 1144 days. Our analysis confirms a known correlation between orbital and long periods that is also observed in similar systems in the Magellanic Clouds.
Mixed Modes and Asteroseismic Surface Effects. II. Subgiant Systematics
Authors: Ong 王 J. M. Joel 加冕 , Basu Sarbani , Lund Mikkel N. , Bieryla Allyson , Viani Lucas S. , Latham David W.
Published: November 2021

Models of solar-like oscillators yield acoustic modes at different frequencies than would be seen in actual stars possessing identical interior structure, due to modeling error near the surface. This asteroseismic “surface term” must be corrected when mode frequencies are used to infer stellar structure. Subgiants exhibit oscillations of mixed acoustic (p-mode) and gravity (g-mode) character, which defy description by the traditional p-mode asymptotic relation. Since nonparametric diagnostics of the surface term rely on this description, they cannot be applied to subgiants directly. In Paper I, we generalized such nonparametric methods to mixed modes, and showed that traditional surface-term corrections only account for mixed-mode coupling to, at best, first order in a perturbative expansion. Here, we apply those results, modeling subgiants using asteroseismic data. We demonstrate that, for grid-based inference of subgiant properties using individual mode frequencies, neglecting higher-order effects of mode coupling in the surface term results in significant systematic differences in the inferred stellar masses, and measurable systematics in other fundamental properties. While these systematics are smaller than those resulting from other choices of model construction, they persist for both parametric and nonparametric formulations of the surface term. This suggests that mode coupling should be fully accounted for when correcting for the surface term in seismic modeling with mixed modes, irrespective of the choice of correction used. The inferred properties of subgiants, in particular masses and ages, also depend on the choice of surface-term correction, in a different manner from those of both main-sequence and red giant stars.
Halo-model Analysis of the Clustering of Photometric Luminous Red Galaxies at 0.10 ≤ z ≤1.05 from the Subaru Hyper Suprime-Cam Survey
Authors: Ishikawa Shogo , Okumura Teppei , Oguri Masamune , Lin Sheng-Chieh
Published: November 2021

We present the clustering analysis of photometric luminous red galaxies (LRGs) at a redshift range of 0.1 ≤ z ≤ 1.05 using 615,317 photometric LRGs selected from the Hyper Suprime-Cam Subaru Strategic Program, covering ∼124 deg2. Our sample covers a broad range of stellar masses and photometric redshifts and enables a halo occupation distribution analysis to study the redshift and stellar-mass dependence of dark halo properties of LRGs. We find a tight correlation between the characteristic dark halo mass to host central LRGs,

M

min

, and the number density of LRGs, independently of redshifts, indicating that the formation of LRGs is associated with the global environment. The

M

min

of LRGs depends only weakly on the stellar mass M
⋆ at M
⋆ ≲ 1010.75
h
−2
M
⊙ at 0.3 < z < 1.05, in contrast to the case for all photometrically selected galaxies, for which

M

min

shows significant dependence on M
⋆ even at low M
⋆. The weak stellar-mass dependence is indicative of the dark halo mass being the key parameter for the formation of LRGs, rather than the stellar mass. Our result suggests that the halo mass of ∼1012.5±0.2
h
−1
M
⊙ is the critical mass for an efficient halo quenching due to the halo environment. We compare our result with the result of the hydrodynamical simulation to find that low-mass LRGs at z ∼ 1 will increase their stellar masses by an order of magnitude from z = 1 to 0 through mergers and satellite accretions, and that a large fraction of massive LRGs at z < 0.9 consist of LRGs that recently migrated from massive green valley galaxies or those that evolved from less massive LRGs through mergers and satellite accretions.
A VLA Survey of Late-time Radio Emission from Superluminous Supernovae and the Host Galaxies
Authors: Hatsukade Bunyo , Tominaga Nozomu , Morokuma Tomoki , Morokuma-Matsui Kana , Matsuda Yuichi , Tamura Yoichi , Niinuma Kotaro , Motogi Kazuhiro
Published: November 2021

We present the results of 3 GHz radio continuum observations of 23 superluminous supernovae (SLSNe) and their host galaxies by using the Karl G. Jansky Very Large Array conducted 5–21 yr after the explosions. The sample consists of 15 Type I and 8 Type II SLSNe at z < 0.3, providing one of the largest samples of SLSNe with late-time radio data. We detected radio emission from one SLSN (PTF10hgi) and five hosts with a significance of >5σ. No time variability is found in late-time radio light curves of the radio-detected sources in a timescale of years except for PTF10hgi, whose variability is reported in a separate study. Comparison of star formation rates (SFRs) derived from the 3 GHz flux densities with those derived from SED modeling based on UV–NIR data shows that four hosts have an excess of radio SFRs, suggesting obscured star formation. Upper limits for undetected hosts and stacked results show that the majority of the SLSN hosts do not have a significant obscured star formation. By using the 3 GHz upper limits, we constrain the parameters for afterglows arising from interaction between initially off-axis jets and circumstellar medium (CSM). We found that the models with higher energies (E
iso ≳ several × 1053 erg) and CSM densities (n ≳ 0.01 cm−3) are excluded, but lower energies or CSM densities are not excluded with the current data. We also constrained the models of pulsar wind nebulae powered by a newly born magnetar for a subsample of SLSNe with model predictions in the literature.
Optical and Near-infrared Pulsation Properties of RR Lyrae and Population II Cepheid Variables in the Messier 15 Globular Cluster
Authors: Bhardwaj Anupam , Rejkuba Marina , Sloan G. C. , Marconi Marcella , Yang Soung-Chul
Published: November 2021

Messier 15 (NGC 7078) is an old and metal-poor post core-collapse globular cluster that hosts a rich population of variable stars. We report new optical (gi) and near-infrared (NIR, JK

s
) multi-epoch observations for 129 RR Lyrae, 4 Population II Cepheids (3 BL Herculis, 1 W Virginis), and 1 anomalous Cepheid variable candidate in M15 obtained using the MegaCam and the WIRCam instruments on the 3.6 m Canada–France–Hawaii Telescope. Multi-band data are used to improve the periods and classification of variable stars, and determine accurate mean magnitudes and pulsational amplitudes from the light curves fitted with optical and NIR templates. We derive optical and NIR period–luminosity relations for RR Lyrae stars which are best constrained in the K

s
band,

m

K

s

=
−
2.333

(
0.054
)
log
P
+
13.948

(
0.015
)

with a scatter of only 0.037 mag. Theoretical and empirical calibrations of RR Lyrae period–luminosity–metallicity relations are used to derive a true distance modulus to M15: 15.196 ± 0.026 (statistical) ± 0.039 (systematic) mag. Our precise distance moduli based on RR Lyrae stars and Population II Cepheid variables are mutually consistent and agree with recent distance measurements in the literature based on Gaia parallaxes and other independent methods.
Probing the Time Variation of a Fine Structure Constant Using Galaxy Clusters and the Quintessence Model
Authors: Liu 刘 Zhi-E 志娥 , Liu 刘 Wen-Fei 文斐 , Zhang 张 Tong-Jie 同杰 , Zhai 翟 Zhong-Xu 忠旭 , Bora Kamal
Published: November 2021

We explore a possible time variation of the fine structure constant (α ≡ e
2/ℏ
c) using the Sunyaev–Zel’dovich effect measurements of galaxy clusters along with their X-ray observations. Specifically, the ratio of the integrated Comptonization parameter

Y

SZ

D

A

2

and its X-ray counterpart Y

X
is used as an observable to constrain the bounds on the variation of α. Considering the violation of the cosmic distance duality relation, this ratio depends on the fine structure constant of ∼ α
3. We use the quintessence model to provide the origin of α time variation. In order to give a robust test on α variation, two galaxy cluster samples, the 61 clusters provided by the Planck collaboration and the 58 clusters detected by the South Pole Telescope (SPT), are collected for analysis. Their X-ray observations are given by the XMM-Newton survey. Our results give

ζ
=
−

0.203

−
0.099

+
0.101

for the Planck sample and

ζ
=
−

0.043

−
0.148

+
0.165

for the SPT sample, indicating that α is constant with redshift within 3σ and 1σ for the two samples, respectively.
A MeerKAT 1.28 GHz Atlas of Southern Sources in the IRAS Revised Bright Galaxy Sample
Authors: Condon J. J. , Cotton W. D. , Jarrett T. , Marchetti L. , Matthews A. M. , Mauch T. , Moloko M. E.
Published: November 2021

The IRAS Revised Bright Galaxy Sample (RBGS) comprises galaxies and unresolved mergers stronger than S = 5.24 Jy at λ = 60 μm with Galactic latitudes ∣b∣ > 5°. Nearly all are dusty star-forming galaxies whose radio continuum and far-infrared luminosities are proportional to their current rates of star formation. We used the MeerKAT array of 64 dishes to make 5 × 3 minutes snapshot observations at ν = 1.28 GHz covering all 298 southern (J2000 δ < 0°) RBGS sources identified with external galaxies. The resulting images have θ ≈ 7.″5 FWHM resolution and rms fluctuations σ ≈ 20 μJy beam−1 ≈ 0.26 K low enough to reveal even faint disk emission. The rms position uncertainties are σ

α
≈ σ

δ
≈ 1″ relative to accurate near-infrared positions, and the image dynamic ranges are DR ≳ 104: 1. Cropped MeerKAT images of all 298 southern RBGS sources are available in FITS format from 10.48479/dnt7-6q05.
Magnetohydrodynamic Modeling of the Solar Corona with an Effective Implicit Strategy
Authors: Feng Xueshang , Wang Haopeng , Xiang Changqing , Liu Xiaojing , Zhang Man , Zhao Jingmin , Shen Fang
Published: November 2021

In this paper, we design an effective and robust model to solve the 3D single-fluid solar wind plasma magnetohydrodynamics (MHD) problem of low plasma β. This MHD model is formulated on a six-component composite grid system free of polar singularities. The computational domain ranges from the solar surface to the super-Alfvénic region. As common to all MHD codes, this code must handle the physical positivity-preserving property, time-step enlargement, and magnetic field divergence-free maintenance. To maintain physical positivity, we employ a positivity-preserving Harten–Lax–van Leer Riemann solver and take a self-adjusting and positivity-preserving method for variable reconstruction. To loosen the time-step limitation, we resort to the implicit lower–upper symmetric Gauss–Seidel method and keep the sparse Jacobian matrix diagonally dominant to improve the convergence rate. To deal with the constant theme of a magnetic field that is divergence-free, we adopt a globally solenoidality-preserving approach. After establishing the solar wind model, we use its explicit and implicit versions to numerically investigate the steady-state solar wind in Carrington rotations (CRs) 2172 and 2210. Both simulations achieve almost the same results for the two CRs and are basically consistent with solar coronal observations and mapped in situ interplanetary measurements. Furthermore, we use the implicit method to conduct an ad hoc simulation by multiplying the initial magnetic field of CR 2172 with a factor of 6. The simulation shows that the model can robustly and efficiently deal with the problem of a plasma β as low as about 5 × 10−7. Therefore, the established implicit solar wind MHD model is very promising for simulating complex and strong magnetic environments.
Atomic Iron and Nickel in the Coma of C/1996 B2 (Hyakutake): Production Rates, Emission Mechanisms, and Possible Parents
Authors: Bromley S. J. , Neff B. , Loch S. D. , Marler J. P. , Országh J. , Venkataramani K. , Bodewits D.
Published: November 2021

Two papers recently reported the detection of gaseous nickel and iron in the comae of over 20 comets from observations collected over two decades, including interstellar comet 2I/Borisov. To evaluate the state of the laboratory data in support of these identifications, we reanalyzed archived spectra of comet C/1996 B2 (Hyakutake), one of the nearest and brightest comets of the past century, using a combined experimental and computational approach. We developed a new, many-level fluorescence model that indicates that the fluorescence emissions of Fe I and Ni I vary greatly with heliocentric velocity. Combining this model with laboratory spectra of an Fe-Ni plasma, we identified 22 lines of Fe I and 14 lines of Ni I in the spectrum of Hyakutake. Using Haser models, we estimate the nickel and iron production rates as Q
Ni = (2.6–4.1) × 1022 s−1 and Q
Fe = (0.4–2.8) × 1023 s−1. From derived column densities, the Ni/Fe abundance ratio log10[Ni/Fe] = −0.15 ± 0.07 deviates significantly from solar abundance ratios, and it is consistent with the ratios observed in solar system comets. Possible production and emission mechanisms are analyzed in the context of existing laboratory measurements. Based on the observed spatial distributions, excellent fluorescence model agreement, and Ni/Fe ratio, our findings support an origin consisting of a short-lived unknown parent followed by fluorescence emission. Our models suggest that the strong heliocentric velocity dependence of the fluorescence efficiencies can provide a meaningful test of the physical process responsible for the Fe I and Ni I emission.
The alien vascular flora of Stromboli and Vulcano (Aeolian Islands, Italy)
Authors: Di Gristina Emilio , Domina Gianniantonio , Barone Giulio
Published: November 2021

The updated censuses of the alien flora of the islands of Stromboli and Vulcano, Aeolian Islands in the Central Tyrrhenian Sea, are presented here. They currently consist of 40 and 57 specific and subspecific taxa respectively. As many as 16 and 18 taxa respectively are new in comparison with the last censuses in 2016. Mesembryanthemum × vascosilvae, commonly cultivated in both islands, is reported for the first time as naturalized alien to Italy. Passiflora incarnata from Stromboli and Pelargonium graveolens from Vulcano are reported for the first time as casual aliens to Sicily. The evolution over time of these florulas, as inferred from the main floristic works published on these islands, is commented on. Biology, ecology and possible causes of settlement of these plants are discussed briefly.
Calceolaria flavida (Calceolariaceae) a new endemic species to central Chile
Authors: Lavandero Nicolás , Santilli Ludovica , Pérez Fernanda
Published: November 2021

A new species of Calceolaria sect. Cheiloncos endemic to central Chile is described. A comparison with the morphologically similar species Calceolaria asperula and Calceolaria petioalaris is made, and a key as well as detailed images to differentiate them is provided. The species is only known from the Natural Sanctuary Cerro El Roble, which is part of the coastal mountain range of central Chile and can be considered as Critically Endangered (CR) under the IUCN categories and criteria.
Travail bénévole dans l’aide sociale et juridique aux demandeurs d’asile
Authors: Lepoutre Lucie
Published: November 2021

Des associations sont mandatées par l’État pour réaliser un accompagnement social et juridique des demandeurs d’asile en recrutant des intervenants salariés. En parallèle, de nombreuses associations de bénévoles en France assurent la réalisation de missions similaires. À partir d’une enquête sociologique, cet article interroge la place des bénévoles dans l’aide sociale et juridique apportée aux personnes en demande d’asile. Ce travail gratuit est porteur d’un message de solidarité et d’engagement citoyen auprès des personnes migrantes. Il est aussi révélateur d’un système d’accueil sous-dimensionné qui ne parvient pas à répondre à l’ensemble des besoins. Pour les associations militantes, la gratuité est alors mobilisée comme un argument permettant de dénoncer le manque de moyens que l’État attribue à cette cause.
L’entrepreneuriat coopératif, levier du développement territorial dans les régions septentrionales du Cameroun
Authors: Mewouth Thang Armel Gilles
Published: November 2021

Cet article s’intéresse à la contribution de l’entrepreneuriat coopératif au développement des territoires dans les régions septentrionales du Cameroun. Il s’appuie sur les données primaires et secondaires collectées auprès de quatre coopératives agricoles et de différents acteurs intervenant dans le développement agricole local. Les résultats révèlent que la dynamique entrepreneuriale coopérative suscite beaucoup d’intérêt chez les agriculteurs et contribue au développement humain, économique et territorial. Pour assurer la pérennité de ce mouvement, il faut que la puissance publique définisse mieux la politique agricole nationale, régionale et même locale. L’État camerounais et les collectivités territoriales décentralisées doivent davantage s’impliquer dans le mouvement entrepreneurial coopératif, afin d’en faire un véritable levier de développement des territoires.
Les fruits tiennent-il les promesses des fleurs ? Une analyse des pratiques de microcrédit de l’UM-Pamecas au Sénégal
Authors: Sarr Ndèye Faty , Fall Marie
Published: November 2021

Cet article s’intéresse aux impacts économiques et sociaux des microcrédits sur l’autonomisation des femmes de l’Union des mutuelles-Partenariat pour la mobilisation de l’épargne et le crédit au Sénégal (UM-Pamecas). En effet, les femmes des pays d’Afrique subsaharienne ont tenté de répondre aux conséquences des programmes d’ajustement structurel (PAS) en investissant en nombre le secteur informel. C’est dans ce contexte qu’il faut comprendre l’introduction de la microfinance dans les dispositifs de financement de l’entrepreneuriat féminin. L’analyse du mode de fonctionnement de l’UM-Pamecas montre que cette institution a délimité un champ mettant en présence des représentations, des pratiques, des stratégies et des acteurs susceptibles de l’éloigner des objectifs proclamés de la microfinance (lutte contre la pauvreté, promotion de l’égalité entre les hommes et les femmes).
A new approach based on inventory control using interval differential equation with application to manufacturing system
Authors: Rahman Md Sadikur , Das Subhajit , Manna Amalesh Kumar , Shaikh Ali Akbar , Bhunia Asoke Kumar , Ahmadian Ali , Salahshour Soheil
Published: November 2021

Now-a-days, uncertainty conditions play an important role in modelling of real-world problems. In this regard, the aim of this study is two folded. Firstly, the concept of system of interval differential equations and its solution procedure in the parametric approach have been proposed. To serve this purpose, using parametric representation of interval and its arithmetic, system of linear interval differential equations is converted to the system of differential equations in parametric form. Then, a mixing problem with three liquids is considered and the mixing process is governed by system of interval differential equations. Thereafter, the mixing liquid is used in the production process of a manufacturing firm. Secondly, using this concept, a production inventory model for single item has been developed by employing mixture of liquids and the proposed production system is formulated mathematically by using system of interval differential equations.The corresponding interval valued average profit of the proposed model has been obtained in parametric form and it is maximized by centre-radius optimization technique. Then to validate the proposed model, two numerical examples have been solved using MATHEMATICA software. In addition, we have shown the concavity of the objective function graphically using the code of 3D plot in MATHEMATICA. Finally, the post optimality analyses are carried out with respect to different system parameters.
Research on the control problem of actuator anti-saturation of supercavitating vehicle
Authors: Bai Tao ,   College of Intelligent Systems Science and Engineering, Harbin Engineering University, Harbin, 150001, China, Song Junkai
Published: November 2021

In the theoretical controller design of the high-speed supercavitating vehicle (HSSV), there will always be the problem that the physical saturation limit has to be exceeded by the motion range of the actuator to satisfy the requirements of stable motion of the supercavitating vehicle. This paper proposes a solution which could satisfy the requirements of stable motion of the vehicle without saturation of the actuator. First of all, the rotation range of the actuator and the motion performance of the vehicle with robust controller are analyzed under the condition where saturation is neglected. Then, according to the analysis conclusion, the controller is improved by using linear active disturbance rejection control (LADRC) method, which provides the additional control component to reduce the rotation angle and rotation speed of the actuator. Finally, the simulation proves that the solution could realize the stable motion of vehicle without saturation of actuator.