bluuebunny/crossref_metadata_2025 huggingface dataset:
Radial-velocity Precision of ESPRESSO Through the Analysis of the Solar Twin HIP 11915
Authors: Netto Yuri , Lorenzo-Oliveira Diego , Meléndez Jorge , Yana Galarza Jhon , Haywood Raphaëlle D. , Spina Lorenzo , dos Santos Leonardo A.
Published: September 2021

Different stellar phenomena affect radial velocities (RVs), causing variations large enough to make it difficult to identify planet signals from the stellar variability. RV variations caused by stellar oscillations and granulation can be reduced through some methods, but the impact of rotationally modulated magnetic activity on RV, due to stellar active regions, is harder to correct. New instrumentation promises an improvement in precision of one order of magnitude, from about 1 m s−1 to about 10 cm s−1. In this context, we report our first results from 24 spectroscopic Echelle SPectrograph for Rocky Exoplanets and Stable Spectroscopic Observations (ESPRESSO)/Very-Large Telescope observations of the solar twin star HIP 11915, spread over 60 nights. We used a Gaussian Process approach and found for HIP 11915 a RV residual rms scatter of about 20 cm s−1, representing an upper limit for the performance of ESPRESSO.
Constraints on the Assembly History of the Milky Way's Smooth, Diffuse Stellar Halo from the Metallicity-dependent, Radially Dominated Velocity Anisotropy Profiles Probed with K Giants and BHB Stars Using LAMOST, SDSS/SEGUE, and Gaia
Authors: Bird Sarah A. , Xue Xiang-Xiang , Liu Chao , Shen Juntai , Flynn Chris , Yang Chengqun , Zhao Gang , Tian Hai-Jun
Published: September 2021

We analyze the anisotropy profile of the Milky Way’s smooth, diffuse stellar halo using the Sloan Digital Sky Survey (SDSS) SEGUE blue horizontal branch stars and the SDSS/SEGUE and LAMOST K giants. These intrinsically luminous stars allow us to probe the halo to approximately 100 kpc from the Galactic center. Line-of-sight velocities, distances, metallicities, and proper motions are available for all stars via SDSS/SEGUE, LAMOST, and Gaia, and we use these data to construct a full 7D set consisting of positions, space motions, and metallicity. We remove substructure from our samples using integrals of motion based on the method of Xue et al. We find radially dominated kinematic profiles with nearly constant anisotropy within 20 kpc, beyond which the anisotropy profile gently declines but remains radially dominated to the farthest extents of our sample. Independent of star type or substructure removal, the anisotropy depends on metallicity, such that the orbits of the stars become less radial with decreasing metallicity. For −1.7 < [Fe/H] < −1, the smooth, diffuse halo anisotropy profile begins to decline at Galactocentric distances ∼20 kpc, from

β
∼
0.9

to 0.7 for K giants and from

β
∼
0.8

to 0.1 for blue horizontal branch stars. For [Fe/H] < −1.7, the smooth, diffuse halo anisotropy remains constant along all distances with

0.2
<
β
<
0.7

depending on the metallicity range probed, but independent of star type. These samples are ideal for estimating the total Galactic mass as they represent the virialized stellar halo system.
On the Origin of Switchbacks Observed in the Solar Wind
Authors: Mozer F. S. , Bale S. D. , Bonnell J. W. , Drake J. F. , Hanson E. L. M. , Mozer M. C.
Published: September 2021

The origin of switchbacks in the solar wind is discussed in two classes of theory that differ in the location of the source being either near the transition region near the Sun or in the solar wind itself. The two classes of theory differ in their predictions of the switchback rate (the number of switchbacks observed per hour) as a function of distance from the Sun. To distinguish between these theories, one-hour averages of Parker Solar Probe data were averaged over five orbits to find the following: (1) The hourly averaged switchback rate was independent of distance from the Sun. (2) The average switchback rate increased with solar wind speed. (3) The switchback size perpendicular to the flow increased as R, the distance from the Sun, while the radial size increased as R
2, resulting in an increasing switchback aspect ratio with distance from the Sun. (4) The hourly averaged and maximum switchback rotation angles did not depend on the solar wind speed or distance from the Sun. These results are consistent with switchback formation in the transition region because their increase of tangential size with radius compensates for the radial falloff of their equatorial density to produce switchback rates that are independent of radial distance. This constant switchback rate is inconsistent with an in situ source. The switchback size and aspect ratio, but not their hourly average or maximum rotation angle, increased with radial distance to 100 solar radii. Additionally, quiet intervals between switchback patches occurred at the lowest solar wind speeds.
Solar Neighborhood Exoplanet Host Stars within a Galactic Context
Authors: Smith Graeme H.
Published: September 2021

Ages, metallicities, and Galactic orbit parameters are considered for those stars with Henry Draper catalog designations that have been discovered to host planetary systems. There are quite a few such stars with above-solar metallicity and ages up to 4 Gyr older than the Sun. Some planet-hosting stars have Galactic orbits that take them within 4 kpc of the Galactic Center, while a substantial fraction attain displacements from the Galactic mid-plane consistent with the thick disk.
The Roles of Latent Heating and Dust in the Structure and Variability of the Northern Martian Polar Vortex
Authors: Ball E. R. , Mitchell D. M. , Seviour W. J. M. , Thomson S. I. , Vallis G. K.
Published: September 2021

The winter polar vortices on Mars are annular in their potential vorticity (PV) structure, a phenomenon identified in observations, reanalysis, and some numerical simulations. Some recent modeling studies have proposed that condensation of atmospheric carbon dioxide at the winter pole is a contributing factor to maintaining the annulus through the release of latent heat. Dust and topographic forcing are also known to be causes of internal and interannual variability in the polar vortices. However, coupling between these factors remains uncertain, and previous studies of their impact on vortex structure and variability have been largely limited to a single Martian global climate model (MGCM). Here, by further developing a new MGCM, we decompose the relative roles of latent heat, topography, and dust as drivers for the variability and structure of the northern Martian polar vortex. Additionally, we analyze a reanalysis data set, finding that there are significant differences in vortex morphology and variability according to the spacecraft instrument used for the data assimilation. In both model and reanalysis, high atmospheric dust loading (such as that seen during a global dust storm) can disrupt the vortex, cause the destruction of PV in the low-to-mid-altitudes (>0.1 hPa), and significantly reduce spatial and temporal vortex variability. Through our simulations, we find that the combination of dust and topography primarily drives the eddy activity throughout the Martian year, and that although latent heat release can produce an annular vortex, it has a relatively minor effect on vortex variability.
The InBIO Barcoding Initiative Database: DNA barcodes of Portuguese Diptera 02 - Limoniidae, Pediciidae and Tipulidae
Authors: Ferreira Sónia , Oosterbroek Pjotr , Starý Jaroslav , Sousa Pedro , Mata Vanessa , da Silva Luis , Paupério Joana , Beja Pedro
Published: September 2021

The InBIO Barcoding Initiative (IBI) Diptera 02 dataset contains records of 412 crane fly specimens belonging to the Diptera families: Limoniidae, Pediciidae and Tipulidae. This dataset is the second release by IBI on Diptera and it greatly increases the knowledge on the DNA barcodes and distribution of crane flies from Portugal. All specimens were collected in Portugal, including six specimens from the Azores and Madeira archipelagos. Sampling took place from 2003 to 2019. Specimens have been morphologically identified to species level by taxonomists and belong to 83 species in total. The species, represented in this dataset, correspond to about 55% of all the crane fly species known from Portugal and 22% of crane fly species known from the Iberian Peninsula. All DNA extractions and most specimens are deposited in the IBI collection at CIBIO, Research Center in Biodiversity and Genetic Resources.

Fifty-three species were new additions to the Barcode of Life Data System (BOLD), with another 18 species' barcodes added from under-represented species in BOLD. Furthermore, the submitted sequences were found to cluster in 88 BINs, 54 of which were new to BOLD. All specimens have their DNA barcodes publicly accessible through BOLD online database and its collection data can be accessed through the Global Biodiversity Information Facility (GBIF). One species, Gonomyia tenella (Limoniidae), is recorded for the first time from Portugal, raising the number of crane flies recorded in the country to 145 species.
Nurse Engagement: What are the Contributing Factors for Success?
Authors: Dempsey Christina , Reilly Barbara
Published: September 2021

The concept of nurse engagement is often used to describe nurses’ commitment to and satisfaction with their jobs. In reality, these are just two facets of engagement. Additional considerations include nurses’ level of commitment to the organization that employs them, and their commitment to the nursing profession itself. Because nurse engagement correlates directly with critical safety, quality, and patient experience outcomes, understanding the current state of nurse engagement and its drivers must be a strategic imperative. This article will discuss the current state of nurse engagement, including variables that impact engagement. We also briefly describe the potential impact of compassion fatigue and burnout, and ways to offer compassionate connected care for the caregiver. Such insight is integral to the profession's sustainability under the weight of demographic, economic, and technological pressures being felt across the industry, and is also fundamental to the success of strategies to improve healthcare delivery outcomes across the continuum of care.
They Know Me Here: Patients' Perspectives on Their Nursing Home Experiences
Authors: Tappen Ruth
Published: September 2021

Perspectives from patients who reside in nursing homes can inform administrators and providers about the patient experience in long-term care. In a study of preferences for care in the nursing home or hospital should an acute change in condition occur, nursing home residents offered spontaneous descriptions of their experiences in the nursing home and during their prior hospital stays. This article offers background information about nursing home reform and standards, and contemporary reports on the patient experience in nursing homes. Methods, results, and discussion of the study findings will inform readers specifically about the analysis of the narrative data as it relates to the patient experience. Positive and negative aspects of nursing home patient experiences are discussed and compared to hospital patient experiences. Both settings were both praised and strongly criticized. Many concerns identified as patients discussed their experiences can be remedied by the owners and administrators of these facilities.
ICU Nurses’ Perceptions and Practice of Spiritual Care at the End of Life: Implications for Policy Change
Authors: Abu-El-Noor Nasser
Published: September 2021

Nurses strive to provide holistic care, including spiritual care, for all patients. However, in busy critical care environments, nurses often feel driven to focus on patients’ physical care, possibly at the expense of emotional and spiritual care. This study examined how Palestinian nurses working in intensive care units (ICUs) understand spirituality and the provision of spiritual care at the end of life. In this article, the author presents background studies, encouraging an increased emphasis on spiritual care, and describes the qualitative method used to study 13 ICU Gaza Strip nurses’ understanding of spiritual care. Findings identified the following themes: meaning of spirituality and spiritual care; identifying spiritual needs; and taking actions to meet spiritual needs. The author discusses the difficulty nurses had in differentiating spiritual and religious needs, notes the study limitations, and concludes by recommending increased emphasis on the provision of spiritual care for all patients.
Why Causal Inference Matters to Nurses: The Case of Nurse Staffing and Patient Outcomes
Authors: Costa Deena , Yakusheva Olga
Published: September 2021

Since the early 1990s researchers have steadily built a broad evidence base for the association between nurse staffing and patient outcomes. However, the majority of the studies in the literature employ designs that are unable to robustly examine causal pathways to meaningful improvement in patient outcomes. A focus on causal inference is essential to moving the field of nursing research forward, and as part of the essential skill-set for all nurses as consumers of research. In this article, we aim to describe the importance of causal inference in nursing research and discuss study designs that are more likely to produce causal findings. We first review the conceptual framework supporting this discussion and then use selected examples from the literature, typifying three key study designs – cross-sectional, longitudinal, and randomized control trials (RCTs). The discussion will illustrate strengths and limitation of existing evidence, focusing on the causal pathway between nurse staffing and outcomes. The article conclusion considers implications for future research.
Esther McCready, RN: Nursing Advocate for Civil Rights
Authors: Pollitt Phoebe
Published: September 2021

More than a decade before the Civil Rights Act of 1964, as an African American teenager from Baltimore, Maryland, Esther McCready challenged the discriminatory admissions policies of the University of Maryland School of Nursing (UMSON). The article explores nurse advocacy and how Esther McCready advocated for herself and greater racial equity in nursing education during a time of civil rights turmoil. Her actions eventually resulted in the formation of numerous schools of nursing for African Americans across the south. This article recounts McCready’s early life experiences and the powerful impact her actions had on creating educational options for nurses during a time when they were severely limited for African American women, including discussion of her student days at UMSON and her journey after nursing school. A review of pertinent legal cases and policies related to segregation and integration of higher education in the mid-twentieth century is presented, along with details of McCready’s continued education and advocacy.
Full Practice Authority for Advanced Practice Registered Nurses is a Gender Issue
Authors: Rudner Lugo Nancy
Published: September 2021

In the United States, Advanced Practice Registered Nurse (APRN) regulations are determined at the state level, through legislation and rule making. The lack of an evidence base to APRN regulation has resulted in a patchwork of varied regulations and requirements for nurse practitioners. The author begins this article by reviewing the history of the Equal Rights Amendment (ERA) in the United States and describing her study that assessed APRN fullpractice authority in states that ratified the ERA versus states that opposed it. She presents the study findings, limitations of the comparison, and discussion of the findings and implications. In conclusion, the findings demonstrated that progress toward full APRN practice will require building strategies for political support and framing the need to update APRN regulations in a manner that aligns with each state’s social and political values.
Registered Nurses as Professionals: Accountability for Education and Practice
Authors: Zittel Barbara , Moss Edtrina , O’Sullivan Ann , Siek Terry
Published: September 2021

This article explores the theme that, as professionals, all registered nurses (RNs) are accountable for their own educational development and execution of their individual professional role. To assure that RNs perform to the full scope of their practice and impact the highest possible patient outcomes, a standardized educational preparation of RNs at the BSN level is essential, either through initial education or educational progression. The authors support the need for BSN preparation with a brief review of research to identify seminal works that demonstrate the added value, both economically and in terms of patient outcomes, that results when higher percentages of BSN-prepared RNs provide care. They also discuss RN accountability for educational progression and barriers to earning the BSN. The article summary offers recommendations and action steps to support BSN education and promote RN full scope of practice.
Quelle équipe autour du magistrat ?
Authors: Clochet Clément
Published: September 2021

Malgré les ambitions affichées depuis trois décennies, l'équipe autour des magistrats reste aujourd'hui confuse et incertaine. À l'heure du recrutement annoncé de centaines de contractuels destinés à soutenir les magistrats et greffiers dans les juridictions, une réflexion approfondie sur les tâches et les perspectives de chacun s'impose, afin d'apporter des réponses pérennes aux enjeux humains et budgétaires auxquels l'institution judiciaire fait face.
Silence, silence partagé, awareness
Authors: Winghart Olivier
Published: September 2021

Après avoir présenté le silence dans ses polarités respectives avec le bruit et avec les paroles, nous regardons l’importance des silences en psychothérapie, ce qu’ils permettent et ce qu’ils peuvent provoquer. Puis nous évoquons deux formats de groupe où le silence partagé est volontairement maintenu, avec en particulier l’exercice de la méditation intersubjective.
International. Articulation entre modes d’accueil des jeunes enfants et congés parentaux : un facteur d’inégalité dans la prise en charge des enfants
Authors: Collombet Catherine
Published: September 2021

Le niveau des inégalités sociales d’accès aux modes d’accueil des jeunes enfants est très variable selon les pays. L’article analyse le rôle de l’articulation entre modes d’accueil et congés parentaux dans l’explication de ces inégalités, en comparant la Suède et l’Allemagne à la France. Il montre qu’un schéma laissant le choix entre accueil externe et congés parentaux dès le plus jeune âge de l’enfant à l’instar de la France s’avère plus inégalitaire qu’un schéma dans lequel ces modes de prise en charge se succèdent pour tous les enfants comme en Suède et en Allemagne.
Quand l’équipe fait lien
Authors: André Belen
Published: September 2021

Témoignant du quotidien d’un service de milieu ouvert de la protection judiciaire de la jeunesse, l’auteure met en exergue le rôle de l’équipe, qui apparaît comme un élément essentiel pour perdurer dans le travail social.
Sur la route… debout. Heureux (au) travail !
Authors: Rosset Pierre
Published: September 2021

Un retraité revient sur son parcours de 50 ans dans le travail social et la gouvernance d’un établissement de formation en travail social et tente de répondre dans une réflexion/témoignage pourquoi il « dure » encore aujourd’hui dans celui-ci. Sans doute parce que sur cette route, il a pu faire de belles, nombreuses et importantes rencontres qui l’ont conforté dans le désir d’avancer et de poursuivre son chemin au-delà des obstacles, des incidents de parcours et des doutes…
L’autohypnose, passage vers la durée en travail social
Authors: Testini Antonio
Published: September 2021

Durer dans le travail social ne serait pas le résultat d’une répétition d’épreuves, mais plutôt le fruit de relations sans cesse renouvelées dans la durée. La perceptude, qui correspond à la transe hypnotique, pourrait constituer une ressource pour les travailleurs sociaux moyennant un apprentissage. L’autohypnose serait alors de nature à les soutenir dans le flux de leur activité, envisagée comme le creuset d’où émerge le savoir-faire. Elle pourrait ainsi constituer une alternative à la traditionnelle posture réflexive, en venant appuyer la pratique professionnelle quotidienne.
Recherche-action collaborative et travail social : un moteur pour les pratiques professionnelles
Authors: Barbaut Marie
Published: September 2021

La RAC est une méthodologie scientifique innovante du fait de son processus méthodologique. Elle rapproche les chercheurs et les acteurs de terrains pour travailler des questions sociales dans toutes leurs complexités. Ma recherche sur la RAC et la construction identitaire des travailleurs sociaux m’a permis de mettre en évidence le paradoxe du ré-ancrage des professionnels de terrains dans leurs pratiques professionnelles par le biais de la pratique scientifique.
L’inquiétude, une facette de l’angoisse en fin de vie
Authors: Guérin Benjamin , Joly Clémence , Sisoix Corinne , Zielinski Agata
Published: September 2021

Cette facette de l’angoisse qu’est l’inquiétude ouvre une dynamique relationnelle. L’inquiétude du soignant, de l’accompagnant, qui est l’inquiétude pour autrui, peut aussi être une inquiétude pour soi. Peut-être que le premier aspect de l’accompagnement de cette inquiétude pour autrui c’est de permettre son expression, de créer les conditions de possibilités de son expression, et surtout de ne pas la taire.
Le soin est une action mais il est aussi une relation
Authors: Marmilloud Laure , de Broca Alain , Zielinski Agata , Rochas Bruno , Jarrossay Étienne , d’Aranda Catherine
Published: September 2021

Il est important de ne pas situer le patient que du côté de la passivité ; et de la même manière, le soignant n’est pas qu’un agissant, il fait aussi l’expérience d’un pâtir. Lorsque l’on reçoit l’attention du patient, on lui permet de se recevoir comme une personne qui ne se réduit pas au statut de patient, mais une personne capable d’attention, vivante dans la réciprocité du lien.
Juin 1919, l’Allemagne face au Traité de Versailles
Authors: Hénin Pierre-Yves
Published: September 2021

Les six semaines, s’écoulant de la notification des conditions alliées le 7 mai 1919 à leur acceptation in extremis le 28 juin ont vu les autorités allemandes s’indigner, se déchirer, hésiter, pour finalement se résigner en écartant le rêve romantique d’une résistance sur les terres de l’Est, terreau et refuge du nationalisme germanique et de sa tradition militariste. Cet article rend compte du projet mort-né d’un Oststaat – un État indépendant des marches de l’Est qui aurait échappé aux contraintes alliées. Formulé par des responsables politiques locaux en décembre 1918, ce projet reçoit le soutien du ministre prussien de la Guerre, Walther Reinhardt, et de divers généraux prestigieux. Il cristallise les velléités de résistance dans les semaines dramatiques de juin quand s’impose l’exigence d’une réponse aux Alliés. Dépassés par l’enjeu, les politiques s’en remettent aux militaires. Comme en Novembre 1918, il revient au Quartier-maître général, Wilhelm Groener, de porter la responsabilité – et l’opprobre – d’une décision inévitable qui devait sonner le glas du projet d’ Oststaat .
Les fusillés de la Grande Guerre sont-ils morts au nom de leurs idées pacifistes ?
Authors: Guillot Olivier , Parent Antoine
Published: September 2021

Cet article explore la question des exécutions de soldats français durant la Grande Guerre dans une perspective quantitative. À partir de la base de données des Fusillés de la Première Guerre mondiale du Ministère de la Défense, nous décrivons tout d’abord les caractéristiques de ces soldats ayant été condamnés à mort par un conseil de guerre ou exécutés sommairement, et examinons si leur profil a évolué au cours des années de guerre. Ce portrait statistique est ensuite complété par deux analyses menées à l’aide de modèles de régression. La première se focalise sur la répartition temporelle des exécutions. Nous cherchons notamment à déterminer si les variations du nombre d’exécutions d’un mois à l’autre sont liées aux variations de l’intensité des engagements. La seconde analyse vise à expliquer les différences entre départements dans la proportion de soldats exécutés. Deux constats principaux ressortent de notre étude. Tout d’abord, le profil des soldats fusillés en 1914 était assez différent de celui des soldats ayant été exécutés les années suivantes : il s’agissait plus souvent de cultivateurs, servant dans l’infanterie, sans antécédents judiciaires. En revanche, les fusillés de 1917, l’année des mutineries, ne se distinguaient guère, de par leurs caractéristiques, de ceux de 1916. En second lieu, les résultats de nos régressions suggèrent que la grande majorité des soldats exécutés étaient des « poilus » comme les autres qui se sont retrouvés face à un peloton d’exécution pour avoir commis une faute dans un moment de faiblesse, souvent après avoir pris part à des combats particulièrement violents. Leurs actes étaient probablement, dans la plupart des cas, davantage motivés par l’instinct de survie que par des idées pacifistes ou autres considérations politiques.
De la Grande Guerre à la National Recovery Administration (1917-1935)
Authors: Kirat Thierry , Marty Frédéric
Published: September 2021

L’expérience de l’économie de guerre a renforcé aux États-Unis l’influence d’arguments en faveur d’une concurrence organisée. Étendant les prescriptions du management scientifique des firmes à l’ensemble de l’économie, cette approche visait leur coordination par des échanges d’informations. Cette dernière était vue à la fois comme une nécessité en termes d’efficacité économique et de réponse aux fluctuations cycliques. Une telle perspective conduisait à réduire drastiquement la portée des règles de concurrence. Cependant, des propositions faites lors de la crise de 1929 conduisirent à reproduire en temps de paix l’expérience de l’économie de guerre au risque de mener l’économie américaine à une cartellisation sous l’égide de l’État fédéral. Elles furent rejetées par le Président Hoover pourtant défenseur dans les années 1920 d’un modèle de concurrence régulée. Ces projets furent paradoxalement repris par le Président Roosevelt dans le cadre du premier New Deal. Cet article traite des arguments qui furent avancés pour s’abstraire des règles de concurrence et explique pourquoi l’administration démocrate décida finalement de revenir à une activation résolue du Sherman Act.
Non-global solution for visco-elastic dynamical system with nonlinear source term in control problem
Authors: Dai Xiaoqiang , Li Wenke
Published: September 2021

In this paper, we study the initial boundary value problem of the visco-elastic dynamical system with the nonlinear source term in control system. By variational arguments and an improved convexity method, we prove the global nonexistence of solution, and we also give a sharp condition for global existence and nonexistence.
Long-term wind speed prediction using artificial neural network-based approaches
Authors: Madhiarasan Manogaran ,   Department of Computer Science and Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand, India
Published: September 2021

In the current scenario, worldwide renewable energy systems receive renewed interest because of the global reduction of greenhouse gas emissions. This paper proposes a long-term wind speed prediction model based on various artificial neural network approaches such as Improved Back-Propagation Network (IBPN), Multilayer Perceptron Network (MLPN), Recursive Radial Basis Function Network (RRBFN), and Elman Network with five inputs such as wind direction, temperature, relative humidity, precipitation of water content and wind speed. The proposed ANN-based wind speed forecasting models help plan, integrate, and control power systems and wind farms. The simulation result confirms that the proposed Recursive Radial Basis Function Network (RRBFN) model improves the wind speed prediction accuracy and minimizes the error to a minimum compared to other proposed IBPN, MLPN, and Elman Network-based wind speed prediction models.
The delayed Cucker-Smale model with short range communication weights
Authors: Chen Zili , Yin Xiuxia
Published: September 2021

Various flocking results have been established for the delayed Cucker-Smale model, especially in the long range communication case. However, the short range communication case is more realistic due to the limited communication ability. In this case, the non-flocking behavior can be frequently observed in numerical simulations. Furthermore, it has potential applications in many practical situations, such as the opinion disagreement in society, fish flock breaking and so on. Therefore, we firstly consider the non-flocking behavior of the delayed Cucker\begin{document}$ - $\end{document}Smale model. Based on a key inequality of position variance, a simple sufficient condition of the initial data to the non-flocking behavior is established. Then, for general communication weights we obtain a flocking result, which also depends upon the initial data in the short range communication case. Finally, with no restriction on the initial data we further establish other large time behavior of classical solutions.
THE EFFECT OF LEEWAY ANGLE ON THE PROPELLER PERFORMANCE
Authors: Schot J. J. A. , Eggers R
Published: September 2021

One of the aspects influencing the performance of wind assisted vessels is the effect of leeway (drift) angle on the propeller performance. It is known that due to leeway the delivered propeller power and propulsive efficiency can vary significantly from the straight sailing condition. This effect of leeway angle is studied using a combination of viscous flow calculations and captive model tests for one twin screw and three single screw vessels. It is observed that the changes in mean axial velocity and pre-swirl rotation in the wakefield due to a combination of leeway angle and propeller suction are sufficient to describe the trends observed in captive model tests. This knowledge is used in a proposed prediction method to model the changes in propeller thrust and torque due to leeway angle at the design stage. The prediction model combined with a fit of the average wake parameters for the studied vessel types is finally used the show the trends in propulsive efficiency and delivered propeller power at constant propeller rotation rate and ship speed for small leeway angles.
PERFORMANCE VERIFICATION OF A RECENT ROTOR SAIL INSTALLATION
Authors: Paakkari V , Valkeisenmäki O
Published: September 2021

Auxiliary wind propulsion offers viable solution to reduce the emissions of global shipping. While it is very traditional means of propulsion, it is relatively new to modern commercial shipping. It is then highly important to provide the industry with independent and verified data of its performance. This paper reviews measurement campaigns conducted onboard
cruise ferry Viking Grace, which was retrofitted with a Rotor Sail in April 2018. Four different approaches to the performance verification were applied and the results show good agreement between results from different methods. These results are also seen to be in-line with the original target of the project.
SEAKEEPING AND MANOEUVRING FOR WIND ASSISTED SHIPS
Authors: Eggers R , Kisjes A. S.
Published: September 2021

Research on Wind Assisted Ship Propulsion (WASP) has until now focussed on performance in steady conditions whereas unsteady behaviour is an important part of ship behaviour. For “conventional” manoeuvring and seakeeping, performing direct “free running” scale model tests has been successful to gain understanding and to improve ship designs. In the “WindLab” project the opportunity was taken to extend that approach to aerodynamics: modelling real wind with a simplified wind tunnel in the basin. A unique set-up was tested for its suitability and first data was collected on the performance of wind assisted ships in unsteady scenarios.
Kinetic modeling of oxidation parameters and activities of lipase-lipoxygenase in wheat germ oil
Authors: Erim Köse Y.
Published: September 2021

This study aimed to investigate the oxidation profile of wheat germ oil extracted from raw germ during the stabilization with microwave (MW) treatment, and the kinetics of the oxidation parameters (free fatty acids (FFA), peroxide value (PV), thiobarbituric acid (TBA), α-tocopherol, lipase (LA) and lipoxygenase (LOX) enzymes activities) under different storage conditions. For stabilizing raw germ, the MW was treated at 700 W for three minutes. The oxidation parameters for the kinetic modeling were analyzed at different storage times (0, 15, 30, 45, 60,75, 90, and 105. days) and storage temperatures (-18, 0, 4, and 25 °C). The parameters were mathematically modelled and the PV and LA fitted well to the zero-order kinetic model, while FFA with α-tocopherol and TBA followed the first and second-order kinetics, respectively. The kinetic constant (k) was described by an Arrhenius equation and the activation energy ranged from 5.72 to 18.5 kJ/mol for the stabilized germ.
L’acquisition de la compétence sémantique chez les apprenants chinois du FLE : analyse au travers des valeurs sociales complexes des mots « travail » et « loisirs »
Authors: Xia Xiaoxiao
Published: September 2021

L’objet de notre recherche porte sur la confrontation de la construction linguistique des valeurs sociales complexes et la reconstruction discursive des significations lexicales en chinois et en français auprès des locuteurs natifs et des apprenants chinois du FLE. En analysant les perceptions des significations des mots « travail » et « loisirs », nous essayons de découvrir l’apprentissage des stéréotypes linguistiques et l’acquisition des compétences sémantiques chez les apprenants en langue étrangère. Les résultats montrent que bien que les Français et les Chinois partagent à peu près les mêmes noyaux de ces deux mots, certains stéréotypes sont différents en raison des différences culturelles. En outre, même si les publics sont de la même nationalité, l’apprentissage d’une langue étrangère et le séjour dans le pays de la langue cible amènent des différences dans l’acquisition des significations lexicales. Ceci induit que les enseignants doivent tenir compte non seulement de la correction de la forme linguistique, mais aussi de la pertinence de la performance linguistique dans le processus de l’apprentissage de langue étrangère.
La morale minimale à l’école
Authors: Ogien Ruwen
Published: September 2021

Tous les projets de ramener l’instruction morale à l’école ont confondu la question du juste et celle du bien. La première concerne nos rapports aux autres : dans quelle mesure sommes-nous respectueux, équitables, etc. ? La seconde est celle de savoir ce qu’on va faire de soi-même : du style de vie qu’on veut mener, du genre de personne qu’on doit être, des ingrédients de la vie « bonne » ou « heureuse ». Faut-il être un épargnant raisonnable ou un flambeur ? Un lève-tôt qui essaie d’en faire le plus possible, ou un lève-tard qui essaie d’en faire le moins possible ? Le moralisme consiste à privilégier une de ces visions du bien personnel, et tout programme scolaire qui prétend imposer aux élèves une certaine vision de ce bien personnel au détriment des autres est moraliste. Le projet minimaliste essaie, dans la mesure du possible, d’éviter d’importer le moralisme à l’école. Il repose sur les principes suivants. Dans l’école démocratique, laïque et pluraliste, il est légitime d’instaurer une instruction civique, dont l’objectif est d’enseigner aux élèves le fonctionnement des institutions politiques, et de les rendre sensibles aux normes du juste, c’est-à-dire, entre autres, de la coexistence entre personnes dont les conceptions du monde sont divergentes. Mais la légitimité d’une éducation morale obligatoire, dont l’ambition serait d’engager les élèves dans la vie « bonne » ou « heureuse », ou de leur transmettre une certaine vision du bien, ou des « valeurs » serait aussi contestable qu’un programme d’enseignement d’une religion particulière.
Éthique et pédagogie : entre l’institution de moralité et le désengagement éthique, comment ouvrir le champ d’un perfectionnement moral à l’école ?
Authors: Moreau Didier
Published: September 2021

Le projet actuel de la réintroduction d’un enseignement explicite de la morale à l’école a eu le mérite de mettre au jour les positions métaphysiques que soutiennent ses défenseurs et ses contradicteurs. Nous en réalisons ici l’examen critique en nous appuyant sur leurs présupposés épistémologiques. Nous dégageons alors la perspective de la formation éthique de soi-même telle que les Stoïciens l’ont initiée dans la pratique des exercices spirituels, en montrant comment elle permet de s’affranchir de toute transcendance, même sécularisée. Nous défendons alors l’idée qu’une pédagogie est possible à l’école, par laquelle les pratiques éducatives ouvriraient aux élèves – et à leurs enseignants – le chemin d’une construction éthique de soi, par la mutualisation des valeurs et le partage des expériences, dans l’horizon inachevable d’un perfectionnement de l’être-en-commun, pour lequel aucune institution ne peut prétendre détenir la Vérité.
Innovative Approach for Railway Signalling in Sri Lanka: An Appraisal of Technical and Economic Rationale
Authors: Jayasundara J. I. D.
Published: September 2021

Sri Lanka Railway has been increasingly dependent on foreign sources for its signalling, particularly after the introduction of computer-based electronic technology for signalling. Not many companies have competence in the subject, and the resultant deficiency of market competition has compelled the Sri Lanka Railway to depend on foreign third-party contractors to obtain signalling solutions at high cost. Developing a home-grown railway signalling system, anchored on local technological knowhow which would use components that are readily available in the market, has been a long-felt need. This paper summarises the research and development activities undertaken by the Railway Department in designing and installing a new signalling system to ensure a greater degree of self-reliance in maintenance, sustenance, and further improvement at lesser costs. The technology innovated was used to install colour-light railway signalling at four railway stations and over 28 km of automatic block signalling, resulting in a capital cost saving of around 90% compared to recently procured imported systems. The new system has been found operationally reliable and easily maintainable. With this technological innovation, continued improvements to it, and expansion of its coverage in the railway network, Sri Lanka Railway could look forward to securing very significant operational and cost advantages while generating national economic benefits as well in the years to come.
Use of Analytical Techniques for Decision Making in Sri Lankan Manufacturing Companies
Authors: Liyanage R. N. , Kumarage A. S.
Published: September 2021

Optimising the use of resources through scientific methods is critical for efficiency and accurate pricing in the logistics industry. Analytical techniques (AT) play a decisive role in providing such analytical solutions. This paper explores the use of Analytical Techniques for decision making in the Sri Lankan manufacturing logistics industry through a survey of practices in leading companies in the manufacturing logistics industry. The questionnaire focused on the familiarity of ATs and their use in the different logistics operations. The research reviewed and classified the different AT's most widely used in solving common logistics problems (LP). Closing the gap between the theory and practice of AT in the logistics industry was aimed at through this research, by offering areas in which the industry could successfully adopt appropriate ATs. In this respect, different ATs in seven selected logistics decisions, regularly made in manufacturing firms, were discussed. The current practice in ATs was captured by interviewing leading practitioners in the logistics industry, bringing together the reasons for these gaps and their suggestions for overcoming them. The findings of the research could open up exciting areas for future research on optimisation using ATs in manufacturing logistics.
Effects of integrated reporting on the cost of capital and analysts’ forecasts errors: A study of Johannesburg Stock Exchange listed mining firms
Authors: Ngcobo Bhekisisa N. , Sibanda Mabutho
Published: September 2021

Orientation: Integrated reporting (IR) has gained traction over the last decade. Although IR became mandatory for all firms listed on Johannesburg Stock Exchange (JSE) in 2010, the International Integrated Reporting Council (IIRC) issued the IR framework in December 2013.Research Purpose: The study seeks to investigate the effects of IR on the cost of equity capital and analysts’ forecast errors for the mining firms listed on JSE.Motivation for the study: A large part of empirical evidence highlights benefits of IR; however, some studies still find no link between the quality of integrated reports and economic benefits for the reporting firm. It is against this backdrop that the study investigates effects of integrated reports on the cost of equity capital and analysts’ forecast errors.Research approach, design and method: We use a quantitative research design to test effects of IR on the cost of equity capital and analysts’ forecast errors. We study used a panel regression to analyse relationship amongst IR, cost of equity capital and analysts’ forecast errors.Main findings: The study found a significant negative relationship between IR scores and cost of equity and analysts’ forecast errors.Practical or managerial application: The findings of the study could incentivise managers in other jurisdictions where IR is not mandatory. Furthermore, findings may contribute to the existing discourse on firm-based benefits related to the quality of IR.Contribution or value addition: The study contributes to the body of knowledge with regard to possible benefits associated with compliance with the IR reporting framework.
Sexually transmitted infections in the elderly
Authors: Relhan Vineet , Bansal Anuva , Hegde Pallavi , Sahoo Bijaylaxmi
Published: September 2021

Background:

Worldwide, a steady rise in the incidence of sexually transmitted infections (STIs) in the elderly has been reported and is attributed to aging, unsafe sexual practices, and delayed health-care seeking behavior, leading to a delayed diagnosis and persistence of infection in the community. The aim of this study was to assess the demographic profile, risk factors, and clinical pattern of geriatric STIs.

Aims:

The aim of the study was to assess the demographic profile, risk factors, and clinical pattern of STIs among patients aged ≥60 years presenting to the STI clinic in the dermatology outpatient department at a large tertiary care hospital in New Delhi, over a period of 6 years.

Materials and Methods:

This was a retrospective observational study. Data collection was done for all patients of 60 years and above age group who visited the STI clinic in the dermatology outpatient department, over a period of past 6 years, with symptoms/signs suggestive of an STI, irrespective of whether the final evaluation demonstrated an STI.

Results:

A total number of 123 patients above 60 years of age presented to the STI clinic between 2013 and 2018. The cases presenting annually demonstrated a rising trend and increased from 17 cases in 2013 to 33 in 2018. The most common complaints were ulcers over the genitalia and genital discharge noted in 28.4% of cases each. The most common syndromic diagnosis was vaginal discharge in 25% of cases. Other STDs diagnosed were candidial balanoposthitis in 19.5%, herpes genitalis and genital warts in 16.2% each, and genital scabies in 6.5% cases.

Limitations:

The limitations included a small sample size, retrospective analysis, and categorization of the STDs as syndromes, following standard guidelines developed by the National Aids Control Organization (NACO) and the WHO.

Conclusion:

It is necessary to destigmatize STDs among the elderly, encourage inclusion in screening programs, and offer prompt diagnosis and treatment.
The Impact of Board Characteristics on the Financial Performance of Tanzanian Firms.
Authors:   , Assenga Modest
Published: September 2021

This study investigates the impact of board characteristics on the financial performance of listed Tanzanian firms. The study uses two theories of corporate governance to test the hypothesised relationships between board characteristics and financial performance. These are: namely, agency theory; and resource dependence theory and are complemented through the use of a stewardship theory. The study seeks to investigate the impact of the following variables on financial performance i) independent outside directors; ii) board size; iii) CEO duality; and iv) the board diversity aspects of gender, foreign directors and board skill. The study uses a mixed methods approach and applies a convergent parallel design (Creswell & Plano Clark, 2011), collecting quantitative data from annual reports and qualitative data from semi-structured interviews with 12 key stakeholders in corporate governance. Quantitatively, the study examines the balanced panel data of 80 firm-years observations (2006-2013) from the annual reports of 10 Tanzanian listed firms. The findings partially support agency theory since CEO duality was related with a reduction in financial performance. However, the findings do not support a relationship between the proportion of outside directors on boards and financial performance. The study provides some support for aspects of resource dependence theory, since the findings suggest that there is a positive link between gender diversity and financial performance. However, board size, board skill and foreign directors were not found to have a significant impact on financial performance. Furthermore, the interview findings provide some explanations of the relationships between board characteristics and financial performance by suggesting that the impact depends largely on the independence and proficiency of the individual directors on a firm’s board. The study contributes to the understanding of relationships between board characteristics and financial performance. The study uses, for the first time in this kind of research, Tanzanian data and the underutilised approach of mixed methods to corporate governance research. The study provides academic evidence for Tanzanian policy makers in relation to current and future governance reforms.
Planar EBG Loaded UWB Monopole Antenna with Triple Notch Characteristics
Authors: Kollipara Vamshi , Peddakrishna Samineni , Kumar Jayendra
Published: September 2021

A triple band-notched ultra-wideband (UWB) monopole antenna using a planar electromagnetic bandgap (EBG) design is proposed. The EBG unit cell composed by an Archimedean spiral and inter-digital capacitance demonstrates the notch frequencies. The antenna with EBG cells near the feed line occupies only 30 × 36 mm2 with triple band-rejection characteristics. The three notched bands at 4.2 GHz, 5.2 GHz, and 9.1 GHz can be used in C-band satellite downlink, wireless local area network (WLAN), and X-band radio location for naval radar or military required applications. In addition, the proposed design is flexible to tune different notched bands by altering the EBG dimensions. The parametric analysis is studied in details after placing the EBG unit cells near the feed line to show the coupling effect. The input impedance and surface current distribution analysis are also analyzed to understand the effect of EBG at notch frequencies. The proposed design prototype is fabricated and characterized. A fairly considerable agreement is observed between simulated and measured results.