bluuebunny/crossref_metadata_2025 huggingface dataset:
Historical analysis of the cost of acquiring a coronary stent and feasibility of the new ministry of health ordinance: a retrospective observational longitudinal study
Authors: Taminato Gustavo Semedo , Carretero Scila Andrea Pascoalotte , Conti Paulo Sajovic de , Falcão Gustavo Garcia de Arruda , Teixeira Junior Luiz Alfredo , Buchalla Gustavo , Carboni Felipe do Amaral Carvalho , Cantizano Thainá Marcela , Silva Lais Fernanda da , Martins Daiana Suellen , Carretero Debora Cristina
Published: November 2023

Introduction: According to the World Health Organization (WHO), cardiovascular diseases (CVD) are the leading cause of death in the world. It is estimated that 17.7 million people died from CVD in 2015. According to data from DATASUS, in 2008, 44,138 coronary angioplasties were performed with or without stents. In 2016, 79,997 angioplasties were performed. The cost of orthoses, stents, and special materials for hospitals impacts the financial balance of the single health system (SUS). Objective: It was to carry out a cost analysis of stents for angioplasty from the perspective of the Brazilian Unified Health System. Methods: The present study followed a retrospective longitudinal observational model (STROBE). Data on stents about the years 2020 and 2021 and the cost assessment were carried out by searching the intra-hospital financial database of Santa Casa in the city of Jaú, São Paulo, Brazil, and the SUS table. The research was in the field of incomplete economic evaluation (cost analysis and brands of stents) through macro-costing of stent supply. The variables were presented as percentages, mean, and standard deviation. Comparisons of variables were performed using the Kruskal-Wallis test, with p<0.05, and Tukey analysis (ANOVA-One-Way) with p>0.05 with a statistical difference. Predictive logistic regression analysis was performed to better understand the trend in stent costs each year, with a significant p<0.05. Results: After analyzing the intra-hospital financial data and the SUS table, they showed a significant increase in the transfer value of stents from 2020 to 2021, with average values in reais of R$1,399 to R$2,478, respectively. This difference of R$1,079.00 can be justified by the period of the COVID-19 pandemic, as well as the increase in demand for stents. Conclusion: Lower average values for stent costs were observed in 2020 and 2021 compared to other stent values that were published in studies covering the same periods. However, the average cost of stents in this study in 2021 showed significantly higher values compared to 2020, which further burdened the budget of the Unified Health System. The future perspective is that a greater transfer of funds from the Federal Government for the Unified Health System, as well as a reduction in the cost prices of stents by manufacturers and suppliers in the post-COVID-19 period, to obtain a balance in public spending. Furthermore, it is expected that drug-eluting stents will be more widely used in the Unified Health System. Furthermore, it is necessary to establish public policies to standardize stent prices.
Exploring the assessment, diagnosis and conservative management of patients with neurogenic thoracic outlet syndrome (NTOS): an online survey of UK medical and allied health professionals
Authors: O’Sullivan J , Miller C , Bateman M , Hill J
Published: November 2023

Objective: Neurogenic thoracic outlet syndrome (NTOS) is challenging to diagnose and manage. While physiotherapy is widely recognised as the primary treatment for NTOS, treatment specifics and target populations are poorly described. The objective of this cross- sectional survey was to explore the experiences and opinions of UK therapy and medical professionals regarding the assessment, diagnosis and physiotherapy management of patients with NTOS. Methods: An online survey was distributed through a multimodal recruitment strategy employing snowball sampling. The survey remained active for 4 weeks and targeted healthcare professionals with experience of treating NTOS, ending May 2023. Results: 46/55 (83.6%) responses were deemed eligible for analysis. 84.7% (39/46) worked in the NHS, with 41% (16/39) specialising in multidisciplinary team nerve services and most (58.7%, 27/46) having >10 years of experience treating NTOS. Key findings included: NTOS assessment (performed by >91%) involved taking a subjective history, evaluating cervical and shoulder active range-of-motion, upper limb neurological screening and assessing the patient’s understanding of NTOS. Physiotherapy treatment (provided by >94%) consisted of advice and education, range of motion exercises for the shoulder, cervical and thoracic regions, postural advice, activity modification and a home exercise plan. Three-quarters (76.1%, 35/46) of respondents reported an absence of treatment guidelines for NTOS, and 98% (45/46) expressed the need for further research into exercise and physiotherapy management for NTOS. Conclusion: While clinicians perceive NTOS as a complex condition lacking treatment guidelines, physiotherapy remains a mainstay in the current treatment pathways. Further research is warranted to enhance the understanding of NTOS and develop evidence-based management strategies.
Delivering greener surgery; small changes matter
Authors: Tripathi A , Al-Saadi N , Wall M , Garnham A
Published: November 2023

Countries worldwide have committed to reducing carbon emissions to mitigate the detrimental effect of climate change on the environment. The UK has committed to net zero carbon emissions by 2050. Significant changes are required across all industries, including healthcare, to achieve this target within the deadline.1 Currently, healthcare systems are estimated to account for 4–5% of the overall global carbon footprint, with surgery identified as a major contributor.2,3 The importance of vascular surgery services working towards reducing their carbon footprint has recently been highlighted in an article by the Vascular and Endovascular Research Network et al.4 In this editorial we discuss how simple small changes such as replacing a ubiquitous single- use surgical instrument with a reusable alternative could make a significant difference to carbon emissions and help achieve improved environmental sustainability.
Supporting endovascular practice in 2023 and beyond: the BSET Fellowship Programme
Authors:   British Society of Endovascular Therapy, Wilton E , Sandford R
Published: November 2023

British Society of Endovascular Therapy (BSET) Fellowships were introduced to provide an opportunity for vascular or interventional radiology trainees to acquire new or more complex endovascular skills during a 6-month period in a UK-based endovascular unit of their choice. They were established in 2008 in response to the rapidly expanding field of endovascular practice, with the aim to support high quality endovascular training as well as a new hybrid skillset for those from a vascular surgical background. Since vascular surgery gained independence as a specialty in 2012, evolutions in both vascular surgery and interventional radiology training programmes have facilitated increased exposure to complex endovascular interventions. However, these Fellowships continue to offer a unique opportunity, where trainees benefit from a period of concentrated exposure, working to develop a specific subspecialty interest and ‘fine tune’ their skills in preparation for consultant practice. Further, these Fellowships also offer interventional radiology trainees to be exposed to a larger volume and variety of endovascular procedures, benefiting their future independent practice.
The Effective Strategies for Mitigation the Impact of Co ategies for Mitigation the Impact of Covid-19 on vid-19 on Construction Projects in Egypt
Authors: Magdy Essa Nora , Mahdi Ibrahim , Mohamed Ibrahim Hassan
Published: November 2023

From the time when the first narrated infections in Wuhan China, in late 2019, COVID-19 has had a substantial peal on human life and health. By the early of 2020, the World Health Organization (WHO) announced the eruption of COVID-19, a public health crisis of international concern. On 11 March 2020, the World Health Organization officially announced COVID-19 a pandemic. The first case was infected in Egypt of covid-19 on Feb 14, 2020 (Gilbert et al., 2020). On 16 March 2020, the Egyptian Government began issuing decisions as preventative courses as part of the country's inclusive plan to cope with any potential Coronavirus ramifications (Essa et al., 2022). The prevalence of the covid-19 pandemic and precautionary measures taken by the countries from the ban and closure had had an impact on the different business sectors (Rothan & Byvydy, 2020). Therefore, the study aimed at evaluating the influence of COVID-19 on the construction performance in Egyptian projects. Besides, assessment of the work option strategies under COVID-19 outbreak.
Producción artesanal ecológico y danzas folclóricas de la provincia de Sihuas - Ancash
Authors: Diestra Salinas Fortunato , Ramos Vera Juana Rosa , Lacherre Rodriguez Gisella Patty
Published: November 2023

Conocer la producción artesanal ecológico y las danzas folclóricas de la provincia de Sihuas - Ancash. Métodos: Por la misma naturaleza de la investigación, se trabajó dentro del enfoque cualitativo, utilizando como método, el fenomenológico, basado en un diseño abierto que fue adecuándose de acuerdo a la realidad, que se presentaron en el momento que se realizó el estudio. Como instrumento los mismos investigadores, quienes fueron recogiendo los informes mediante la observación y los informes orales de los participantes que intervinieron en cada pueblo visitado. Fue necesario identificarse y estar en las comunidades varios días para ganarse la confianza del poblador para poder sacar la información requerida para nuestro estudio; luego realizando el informe describiendo las observaciones y los informes orales recibidos en los pueblos visitados. Resultados: Se concluye mencionando de los diferentes puntos significativos que se han encontrado en la investigación.
Lenguaje de programación Java Netbeans y aplicaciones visuales educativas
Authors: Quispe Andía Adrián , Morales Romero Guillermo Pastor , Guía Altamirano Teresa , Quispe Guía Shirley Maria Teresa
Published: November 2023

El presente libro titulado: “Lenguaje de programación Java Netbeans y aplicaciones visuales educativas” producto de una investigación, plantea de manera simple los conceptos y la programación java con aplicaciones educativas con una gran variedad de ejercicios, desde los simples y complejos. Los destinatarios del libro son, en general, los estudiantes de pregrado de la Facultad de Ciencias especialidad de informática, matemática en informática y matemática y otros interesados en la programación Java.
Formación en y para la investigación
Authors: Alarcón Diaz Henry Hugo , Natividad Arroyo Jose Arnin , Espinoza Zavala Eva Esther , Negreiros Merma Ramón , Norabuena Manrique Norma Gregoria
Published: November 2023

La investigación científica, considerada como la función principal de los docentes de una institución de educación superior, especialmente el de una universidad, donde se desarrollan de un lado, estrategias en investigación formativa y por otro lado procesos de formación para la investigación. Bajo este enfoque, es de esta manera, cómo se aborda la investigación científica en las aulas universitarias, donde el desarrollo de ambas formas va a permitir el desarrollo de habilidades investigativas en los estudiantes, así como las estrategias de investigación pertinentes de una forma integral.
Formulasi Body Scrub Beras Ketan Hitam (Oryzae Sativa L. var glutinous) Sebagai Pelembab Alami Kulit
Authors: Ovilia Ovy , Hutahaen Titi Agni , Februyani Nawafila
Published: November 2023

Beras ketan hitam memiliki kandungan sebagai pelembab alami yang dapat melembabkan kulit. Untuk menjaga kulit agar lembab perlu adanya formulasi krim bodyscrub dari beras ketan hitam (Oryzae Sativa L. var glutinous). Penelitian ini membuat krim bodyscrub beras ketan hitam dengan 5 formulasi, 0%, 5%, 10%, 15%, 20%.  Penelitian ini betujuan untuk mengetahui ada tidaknya  iritasi kulit pada sediaan krim bodyscrub dari beras ketan hitam dan mengetahui hasil evaluasi krim bodyscrub dan mengetahui konsentrasi terbaik pada formulasi sediaan krim body scrub dari beras ketan hitam (Ningsi et al., 2015). Metode penelitian dimulai dari pengumpulan sampel, formulasi dan evaluasi uji dan uji stabilitas. Hasil sediaan yang dievaluasi adalah uji daya sebar dan uji kelembapan dilakukan analisis data dengan uji Kruskal Wallis dilanjut dengan One Way Annova dan Post Hoct Tukey hsd. Sediaan F1(0%), F2(5%), F3 (10%), F4 (15%), F5(20%), sudah memenuhi persyaratan untuk uji organoleptik, homogenitas, pH, daya sebar, iritasi, tipe emulsi, stabilitas sediaan. Krim bodyscrub dari beras ketan hitam berpengaruh pada uji kelembapan pada responden dengan hasil F1(0%) memiliki nilai 16.62, F2(5%) memiliki nilai 18.13, F3(10%) memiliki nilai 20.49, F4 memiliki nilai 24.26 dan F5(20%) memiliki nilai 37.58.
Evaluation multicritère pour la rénovation thermique des bâtiments en maçonnerie
Authors: Seddiki Mohamed , Anouche Karima , Bennadji Amar
Published: November 2023

En Algérie, le secteur résidentiel et tertiaire est le secteur le plus énergivore avec une consommation de 34 % de l’énergie finale, pour réduire cette consommation, l’état prévoit un programme de rénovation thermique des bâtiments existants. Sachant que le parc existant compte 1.050.000 habitations en maçonnerie construits avant 1945 et que ces mêmes habitations sont sujettes à un programme de réhabilitation; la rénovation thermique de ces derniers permettrait à la fois, leurs préservations et la réduction de leurs consommations énergétiques. La rénovation thermique des bâtiments en maçonnerie est une décision complexe, elle nécessite une approche globale car elle implique simultanément une multitude de critères (consommation d'énergie, le coût d'investissement, etc), y compris des risques liés à la préservation du patrimoine tel que la perte des caractéristiques esthétiques des bâtiments et des dommages structurels au niveau des murs, du plancher, ou de la toiture en raison de l’accumulation de l’humidité. Cet article propose une méthode d’aide à la décision basée sur les méthodes Promethee (Preference Ranking Organization Method for Enrichment Evaluation) pour la rénovation thermique des bâtiments en maçonnerie à valeur patrimoniale. Le but de cette méthode est de classer les différentes solutions de rénovation thermique. La méthode utilise une approche multicritères qui prend en compte les risques liés à la préservation du patrimoine. Une étude de cas a été menée afin de tester la méthode, comme espéré la méthode fonctionne, il a était possible d’obtenir un classement complet des solutions de rénovation thermique.
Etude du potentiel biométhane des déchets d’abattoirs
Authors: Ouahabi Yasmine Ryma , Maamir Noureddine Wail , Bensadok Kenza
Published: November 2023

Le présent travail consiste à étudier la bio méthanisation, appliquée, aux déchets d’abattoirs, qui peuvent engendrer de grands risques sanitaires et environnementaux, s’ils ne sont pas correctement pris en charge. Du fait qu’ils se décomposent rapidement et peuvent être porteurs d’agents pathogènes et autres contaminants. Le procédé de digestion anaérobie, offre la possibilité de combiner le traitement de ces déchets et la production d’une énergie renouvelable qui est le biogaz. Le but de la présente étude est d’optimiser le taux de dilution des déchets d’abattoirs pour une production maximale en biogaz; les taux expérimentés étant:100%, 75%, et 25%. L’inoculum utilisé pour la digestion de ces déchets est du fumier de bovin digéré jusqu’à épuisement. Le meilleur résultat a été obtenu avec les déchets d’abattoir non dilués, et qui a conduit aux meilleurs taux d’abattement de la matière sèche, de la matière organique, de la DCO et de la DBO5 et correspondant respectivement à 58.83, 67.85, 29.15 et 19.04%.
Modélisation et commande d'un système Multi machines alimentées par un seul convertisseur
Authors: Bessaad Taieb , Taleb Rachid , Bachir Belmadani , Mellakhi Abdelkader
Published: November 2023

Dans ce contexte, le travail présenté porte sur la commande d’un système d’entraînement multi machines mono convertisseur (S3MC). La commande découplée du système d’entraînement multi machines mono convertisseur (S3MC), est possible suivant le modèle mathématique. Ce modèle montre que la commande indépendante de deux machines hexaphasées connectée en série avec triphasé est possible, grâce au contrôle des courants statoriques à la sortie de l’onduleur de tension. Parmi les techniques de commande basées sur le contrôle du courant, en trouve la commande vectorielle qui est largement développée et testée sur des processus industriels de différentes puissances. Ainsi, la commande que nous avons choisie et appliquée au S3MC est basée sur le principe de la commande vectorielle développée pour les machines à courant alternatif.
Présences des préoccupations énergétiques dans l’approche conceptuelle de Fernand Pouillon dans les années 50 Cas d’étude de la cite Climat de France de Pouillon à Alger
Authors: Tehami Mohamed , Anouche Karima
Published: November 2023

Après la deuxième guerre mondiale, il y a eu une grande crise de logement dans l’Europe. Plusieurs réponses ont été proposées à travers les chartes des CIAM qui voyaient l’avenir de la construction du logement de masse dans la standardisation et l’utilisation de nouveaux matériaux ainsi que des techniques et procédés de construction industrialisés à l’image de l'industrie de préfabrication. Le développement durable, ainsi que la réduction de la consommation énergétique n’étaient de loin leurs premières préoccupations. Dans les années 90, les préoccupations énergétiques faisaient partie des problèmes de la qualité du bâtiment à soulever dans la conception architecturale. Cependant, les solutions proposées étaient la plus part du temps isolées et purement techniques. C’est toujours une vision industrielle pour résoudre un problème architectural. En parallèle, dans les années cinquante, Fernand Pouillon, arrive avec de nouvelles idées et une nouvelle vision pour l’avenir de la construction du logement de masse tout en se préoccupant de l’environnement bâti et de la durabilité du matériau. Sa méthode de conception du logement était en avance par rapport à son temps. Il a développé un processus de conception basé sur une industrialisation des procédés de construction par élément simple au lieu d’une préfabrication lourde du logement. A travers l’analyse de la cité d’habitations Climat de France de Fernand Pouillon en Algérie, on essayera de montrer sa vision moderne de l’avenir du logement et la présence des préoccupations énergétiques dans son approche conceptuelle.
Constant Property Newtonian Fluid Flow and Heat Transfer overCascaded Fins
Authors: Menni Younes , Azzi Ahmed , Zidani Chafika
Published: November 2023

Turbulent flow and heat transfer characteristics were studied and analyzed numerically for a constant property Newtonian fluid flowing through a two-dimensional horizontal rectangular cross section channel with staggered, transverse cascaded rectangular-triangular fins (CRTFs) and a constant temperature along both walls. The governing equations based on  model used to describe the turbulence phenomenon, are solved by the finite volume method using the SIMPLEC-algorithm. Computations were carried out in the fully-developed regime for different Reynolds numbers, and geometric locations. In particular, velocity and temperature fields, skin friction coefficient, and local and average Nusselt numbers were obtained. This study can be a real application in the field of heat exchangers and air plane solar collectors.
Simulation numérique du comportement dynamique et thermique de deux fluides en contre courant
Authors: Youcef Ahmed , Saim Rachid
Published: November 2023

Les échanges thermiques interviennent dans de nombreux secteurs d’activités humaines. Dans la plupart de ces activités, le transfert de chaleur doit s’effectuer sans altération des milieux intervenant dans le transfert thermique. Le souci technologique majeur des échangeurs de chaleur est l’amélioration de l’échange thermique entre les deux fluides tout en générant le moins de pertes de charges ou de leur réduire à leur plus bas niveau possible. Les objectifs principaux du présent article qui traite le comportement dynamique et thermique d’un écoulement en convection forcée pour deux fluides est l’amélioration des performances des échangeurs de chaleur.
Direct power control of a grid connected photovoltaic system, associated with an active power filter
Authors: Bengourina Mohamed Rida , Rahli Mostefa , Hassaine Linda
Published: November 2023

In this study, we present a new control method entitled direct power control without voltage sensors of a grid connected photovoltaic system associated with an active power filter. The direct control of power (DPC) is employed for the calculation of reference current generation. In this technique the switches states of inverter are selected from a table of switching based on the immediate errors between the active and reactive powers and their reference values. The objective of this paper is the reduction of Total Harmonic Distortion (THD) of source current, compensate reactive power and inject the maximum active power available from the PV array into the load and/or grid. Matlab/Simulink simulations are provided to demonstrate the performance of the proposed approach.
Etude du rayonnement solaire global à Niamey de la période de pré-mousson et de la mousson de l’année 2013 (mai à octobre)
Authors: Dankassoua Maigargué , Madougou Souley , Aboubacar Almoustapha , Foulani Andre Ibrahim
Published: November 2023

Le soleil rayonne sur la terre une puissance de 1.6 1018 kWh/m2/an dans toutes les longueurs d’onde du spectre de la lumière. C’est une source d’énergie renouvelable inépuisable à l’échelle humaine. Aujourd’hui, cette énergie renouvelable suscite une attention particulière au regard des enjeux de la politique énergétique. Elle constitue une réponse capitale au besoin énergétique mondial dans le contexte du réchauffement climatique. Pour un site donné, la connaissance du potentiel énergétique solaire est un paramètre capital pour le développement des recherches scientifiques, technologiques et économiques des systèmes solaires photovoltaïques, mais aussi pour plusieurs autres applications (thermiques, biomasse). Dans ce travail, à l’aide d’un pyranomètre CMP3, nous avons effectué des mesures du rayonnement solaire global au cours de la période de Mai à Octobre 2013 sur le site de la Faculté des Sciences et Techniques de l’Université Abdou Moumouni de Niamey (Niger) pour évaluer le potentiel du site. L’utilisation aussi de modèles validés d’estimation du rayonnement solaire, nous a permis de calculer ce potentiel. Il ressort de l’analyse des résultats une bonne corrélation entre les résultats mesurés et ceux calculés des modèles. Il se dégage aussi que la région de Niamey dispose d’une bonne insolation.
Comparative analysis of NR and DE methods for multilevel inverters: An experimental case study
Authors: Chabni Fayçal , Taleb Rachid , Belboula Abdelkader
Published: November 2023

This paper presents an experimental performance comparison between differential evolution (DE) algorithm and Newton Raphson (NR) method for solving the optimal switching problem for multilevel inverters with the objective of improving the output AC voltage quality. The methods are used to compute optimal switching angles to control a multilevel inverter in such way that allows the elimination of low order harmonics; this control technique is called selective harmonic elimination. The proposed inverter in this article is composed of two H-bridge cells with non-equal DC voltage sources in order to generate seven voltage levels. The differential evolution (DE) optimization and the Newton Raphson (NR) algorithm is used to solve non-linear transcendental equations necessary for the (SHPWM). Computational results obtained from computer simulations presented a good agreement with the theoretical predictions. A laboratory prototype based on STM32F407 microcontroller was built in order to validate the simulation results.
Speed regulator and hysteresis based on artificial intelligence techniques of three-level DTC with 24 sectors for induction machine
Authors: Benbouhenni Habib , Taleb Rachid
Published: November 2023

Direct torque control (DTC) of induction motor (IM) is important in many applications. In this paper presents a three-level direct torque control with 24 sectors is applied for IM using PI-flou controller and hysteresis regulators based in artificial intelligence techniques. The DTC system is known to offer fast decoupled control between torque and flux via a simple control structure. Nevertheless, DTC system has two major drawbacks, with are the variable inverter switching frequency and high torque output ripple. The validity of the proposed control scheme is verified by simulation tests. The stator flux, torque, and current are determined and compared to the above technique.
Numerical investigation of coaxial turbulent jet
Authors: Safer Nabil Belkacem , Beghidja Abdelhadi
Published: November 2023

The paper presents a numerical study of a compressible and turbulent coaxial jet, using a Large Eddy Simulation type approach. This study focuses on the implementation of a high-performance and modern numerical method to meet the requirements in terms of results accuracy and calculation cost. The code was parallelized using the Message Passing Interface 'MPI' library. Inviscid fluxes are evaluated using a new linearization solver for the equations characteristic of approximate Riemann problem and the solution has been advanced over time using an explicit two-step McCormack method. The purpose of this study is to understand the initial stage of the transition process from laminar to turbulent flow in coaxial jets. Therefore, it has been determined that the first step in the transition process from laminar to turbulent flow in coaxial jets is initiated by the development of Helmholtz (primary vortices) in sheer layers, while three-dimensionalization turbulence is initiated in the second step with the emergence of secondary vortices. The transverse evolution of Reynolds tensors showed that the axial Reynolds tensor contribution is associated with primary instability while the transversal Reynolds tensor contribution is associated with secondary instability. Flow self-similarity state is obtained in fully developed turbulence region. Axi-symmetric mode predominates on each shear layer in the initial flow region. The results obtained are in good agreement with experimental results similar to this study's simulated jet.
Fuzzy logic based vector control of multi-phase permanent magnet synchronous motors
Authors: Mehedi Fayçal , Nezli Lazhari , Mahmoudi Mohamed Oul Hadj , Taleb Rachid , Boudana Djamel
Published: November 2023

This paper presents a fuzzy-logic-based vector control for a five-phase permanent-magnet synchronous motor (PMSM). The high-performance of the proposed fuzzy logic control (FLC)-based PMSM drive are investigated and compared with the conventional proportional-integral (PI) controller at different conditions, such as step change in command speed and load, and robustness against machine parameter variations. Finally, Simulation results shows that FLC presents better performances and high robustness compared to the conventional PI controller.
Simulation numérique de la convection naturelle bidimensionnelle dans une cavité carrée différentiellement chauffée remplie d'air
Authors: Godbane Nadir , Benserai Youssef , Ouarhlent Fouzia , Soudani Azeddine
Published: November 2023

Ce travail consiste à étudier la simulation numérique de la convection naturelle bidimensionnelle laminaire et permanente dans une cavité carrée différentiellement chauffée remplie d’air. Les parois verticales soumises à des températures constantes, alors que les parois horizontales sont considérées comme adiabatiques. Le modèle mathématique utilisé décrivant notre problème a été développé en se basant sur les approximations de Boussinesq. Les équations de Navier Stokes et d’énergie ont été résolues à l’aide du code de calcul commercialisé (FluentT) par la méthode des volumes finis. L’étude effectuée est caractérisée par la visualisation graphique des contours de fonction de courant, des isothermes, des profils de vitesse suivant x et y et des profils de température en fonction de la variation du nombre de Rayleigh pour la convection naturelle pure. La variation du nombre de Rayleigh est effectuée dans la gamme de 103 à 106 pour différentes valeurs du rapport de forme et pour un nombre de Prandtl Pr = 0.72. Les résultats obtenus indiquent que l’augmentation du nombre de Nusselt est proportionnelle à l’augmentation du nombre de Rayleigh, par ailleurs, la convection naturelle est évidemment très sensible à la variation du rapport de forme. En effet, les résultats montrent que la configuration de la cavité verticale donne un meilleur transfert de chaleur. Le nombre de Nusselt moyen est une fonction décroissante du rapport d’aspect de la cavité.
Etude numérique des écoulements dans un micro canal rectangulaire
Authors: Charef-Khodja Nabila , Belkasmi Zoubir , Soudani Azeddine
Published: November 2023

L'objectif du présent travail est d'étudier numériquement le comportement hydrodynamique et les transferts thermiques par convection forcée de l'eau circulant dans un micro canal rectangulaire d’une hauteur allant de 100 à 1 mm. Le nombre de Reynolds est compris entre 50 et 10000. La simulation a été effectuée à l'aide du code de calcul 'Fluent' qui est basé sur la Méthode des Volumes Finis. L'étude numérique indique que l’évolution numérique du coefficient de frottement, pour des écoulements laminaires et turbulents dans des micro canaux lisses, est bien prévue par les lois classiquement utilisées aux échelles conventionnelles. Les résultats ont également confirmé que le nombre de Nusselt est en bon accord avec les valeurs théoriques, sauf pour les canaux de moins de 200 de hauteur où il a été noté une forte diminution des valeurs de Nu.
Potential flow over an inclined thin flat-plate
Authors: Mahboub Chawki , Moummi Noureddine , Brima Abdelhafid
Published: November 2023

This work aims to accurately predict the velocity distribution along a flat-plate surface facing a uniform flow with arbitrary inclination. The Laplace equation governing the problem was solved with the finite difference method, and the results were compared with those come from theory. A simple correlation of the velocity distribution is established.
Optimization design of single phase inverter connected to the grid
Authors: Hassaine Linda , Bengourina Mohamed Rida
Published: November 2023

In grid-connected photovoltaic systems significant improvements can be carried out in the design and implementation of inverters: reduction of harmonic distortion, elimination of the DC component injected into the grid and the proposed control. This paper proposes a control strategy based on PWM switching patterns for an inverter for photovoltaic system connected to the grid in order to control the injected current. The current injected must be sinusoidal with reduced harmonic distortion. An additional filter is designed to reduce high-order harmonics on the output side. This strategy exhibits the advantages: Simplicity, reduction of harmonics, size of the line filter, reduction of the memory requirements and power calculation for the control.
Structural Characterization of ZnO Thin Films Deposited onto Silicon Substrates using Cathodic Magnetron Sputtering
Authors: Ghalmi Leila , Bensmaine Souhila , Merzouk Chems El Hayat
Published: November 2023

In this study, we analyzed Zinc Oxide (ZnO) thin films deposited on silicon substrates using magnetron sputtering. These films have numerous applications in photovoltaic and optoelectronic devices due to their excellent physique properties. We used two structural characterization techniques: X-ray diffraction and scanning electron microscopy. We found that the ZnO films had good crystallinity and a columnar structure on the substrate surface, as indicated by the (002) orientation. These findings could potentially be useful for the development of ZnO-based devices such as solar cells and piezoelectric sensors. our results are consistent with those found by other researchers.
Energy Renovation of an Old University Building
Authors: Kharchi Razika , Danane Fetta , Ounnar Amel , Bourabaa Abdenour , Badjoudj Amira
Published: November 2023

Old buildings consume a lot of energy and no longer comply with thermalregulations, which creates interior discomfort. Our work consists ofhighlighting the effect of the rehabilitation of the building on energy savings and thermal comfort. The case study is an old building converted into offices.We made a dynamic thermal simulation under TRNSYS 17 to analyze thethermal and energetic behavior of the building. The results obtained afterinsulating the opaque walls and replacing the openings are very conclusive.Surface losses decreased by 72%, the heating power decreased by 67%, andthe air conditioning power decreased by 50%.
Design of an autonomous photovoltaic power supply system for Nyabikenke Hospital (Burundi) using the ETAP tool
Authors: Niyonzima Joel , Niyonzima Jean Bosco
Published: November 2023

Our energy future must be based on non-polluting energies with significant resources. Renewable energies are the best candidates, but the intermittency of their production requires finding efficient and environmentally friendly storage means. Solar electricity must be stored to be used later when needed. There are many ways to store electricity, and they all involve converting it to another form of energy that is easier to contain. A study on the design of an autonomous electrical system was carried out at Nyabikenke Hospital to solve the major problem of the lack of hydroelectric power at Nyabikenke Hospital. We therefore first sought to estimate the energy needs of the user and then proceeded to an optimal dimensioning of our system using the ETAP software. In normal operation, the photovoltaic field and the battery bank will operate, in the event of a cut in the two sources, the emergency Diesel generator intervenes. The design tool simulates the operation of an autonomous electrical system for a load of 131.5kW necessary for the hospital to be supplied. He can design any system from the experimental results of the components. The results of the simulation make it possible to characterize the operation of the system in an autonomous application, determine its performance, and evaluate the influence of the various losses.
Prediction of direct normal irradiation using a new empirical sunshine duration-based model
Authors: Takilalte Abdelatif , Dali Ali , Laissaoui Mohammed , Bouhallassa Amar
Published: November 2023

In this work, we are interested in presenting a new approach allowing us to express the Direct Normal solar Irradiation (DNI) according to the sunshine duration essentially. This choice is justified by the fact that in addition to the sunshine, duration has a strong correlation with solar irradiation, it is measured in many radiometric stations. Some clear sky models with modifications developed exclusively here are made valid for all types of sky. The proposed model is compared with one of the intelligent models such as the Support Vector Regression (SVR) for daily data from Ghardaïa.
MEMBERDAYAKAN MOTIVASI BELAJAR DAN KETERAMPILAN BERPIKIR KRITIS SISWA MELALUI PENERAPAN MODEL PEMBELAJARAN DISCOVERY PADA MATERI GETARA DAN GELOMBANG
Authors: Sholikhan Sholikhan , Amul Tilde Novaria , Ain Nurul
Published: November 2023

The objective of this research is (1) to determine the quality of implementing the Discovery Learning model that can enhance students' learning motivation and critical thinking, (2) to assess the improvement in students' critical thinking skills through the application of the Discovery Learning model, and (3) to identify the enhancement in students' learning motivation through the implementation of the Discovery Learning model. The research method employed in this study is classroom action research (CAR), consisting of the stages of planning, action, observation, and reflection. The research subjects are 37 eighth-grade students at SMP PGRI 02 Singosari in the academic year 2022/2023. Data collection procedures include tests, observations, and documentary studies. The research findings indicate that: (1) the quality of implementing the Discovery Learning model, which enhances critical thinking skills and learning motivation, is considered good; (2) there is an improvement in students' critical thinking skills through the application of the Discovery Learning model, (3) there is an increase in students' learning motivation through the implementation of the Discovery Learning model.
Indonesia Reaps the Benefits of Business Performance SME Manufacturing Industry Technology Revolution
Authors: Lee Cheng-Wen , Ande Taufiqquddin
Published: November 2023

The purpose of this study is to determine the extent to which SMEs in Indonesia apply lean manufacturing and industrial technology 4.0. The results of this study indicate that Indonesian SMEs partially and simultaneously have a positive impact. Lean manufacturing systems have an important relationship with the three pillars of Industry 4.0. Excluding equipment and methods and product design. Respondents in the study were 25 SME owners, directors, managers, and deputy managers, the statements and interview questions were based on all aspects of lean manufacturing. in this study only 3 indicators out of 9 Industry 4.0 indicators, namely, additive manufacturing, augmented reality, and simulation in Indonesian SMEs. This research uses SPSS software version 20.0 and E-Views version 10.0.
Analyzing Indonesia’s Inflation in 1998-2020: Error Correction Model Approach
Authors: Farizqiyah Shaila , Yuliana Indah
Published: November 2023

Inflation is a macroeconomic problem that is of concern, unstable inflation has a negative impact on people's welfare, so inflation control is important. The purpose of this study is to estimate the factors that influence inflation in Indonesia for the period 1998-2020. The research method uses descriptive analysis by providing an overview of the development of inflation, interest rates, exchange rates, household consumption, and GDP in Indonesia during 1998-2020. Quantitative analysis using Error Correction Model (ECM). This study uses secondary data from the Central Statistics Agency (BPS) and Bank Indonesia (BI). The results obtained indicate that all variables (interest rates, exchange rates, household consumption and GDP) simultaneously have a significant effect on inflation, both in the long and short term. Based on the results of the partial test, the interest rate variable has a positive and significant effect on inflation in Indonesia both in the long and short term. The exchange rate variable partially has a negative and significant effect on inflation in Indonesia, both in the long and short term. Furthermore, the GDP variable partially has a positive and significant effect on inflation in the long term but not significant in the short term. Meanwhile, the household consumption variable partially has no significant effect on inflation in Indonesia during the 1998-2020 period.
The Four-Capital Theory as Framework for Teacher Retention and Attrition
Authors: Vaidya Sheila Rao , Hanna Casey
Published: November 2023

There has been a strong interest in teacher retention and attrition which has been studied extensively over the past twenty or more years. While some researchers have attributed teacher attrition to low teacher salaries, poor working conditions, lack of administrative support and resources, other research focuses on the “emotional” aspect of the profession where educators continue to stay because of their love for teaching, for their students, and how they imagine possibilities for their students’ futures. A more comprehensive theory of retention and attrition is Mason and Matas’ (2015) four capital framework which consists of human capital, social capital, structural capital, and positive psychological capital. In our research with teacher residents in a preparation program, we used interviews, survey, and focus group to obtain data, and found strong prevalence of the four capitals as competing and intersecting phenomenon aiding in understanding the varied and complex factors that contribute to teacher retention or attrition. Additionally, we found that one or more of these four capitals may significantly impact teacher retention or attrition more than others, at any given time and one type of capital may help to overcome limitations in another. Therefore, we found this to be a worthwhile framework to incorporate in teacher preparation.
Relation between Demographic Profiles and Residential Satisfaction Among Iranian Citizens: A Case Study
Authors: Elahi Reza
Published: November 2023

Housing is a basic human need and a basic human right and one of the most important issues that humans have always been struggling with and trying to find a proper and reasonable answer to this problem. As such, one of the significant aspects in this context is the residential satisfaction from the residents’ perspective. Having this mind, residential satisfaction among the city dwellers in most urban areas become highly unclear and for Mashhad’s urban areas, there is dearth of knowledge. Therefore, the current study was an endeavor to explore the level of residential satisfaction among the residents in District 11 of Mashhad, Iran and to explore whether residential satisfaction rates differed according to demographic information including gender, job type, age, and residency history. A questionnaire on Residential Satisfaction examining four categories of body, facilities, utilities, and economy using 22 questions, which showed a reliability of 0.81 was completed by 70 participants. The Statistical analyses revealed that residential satisfaction level among the participants of this study was above average and the highest satisfaction rate belonged to the body of the apartment whereas the lowest category went for utilities. Moreover, the residents showed dissatisfaction with parking, followed by garbage collection, and the asphalt in the neighborhood as the biggest concerns; yet, they were highly satisfied with water, electricity, gas, telecommunication and drainage system. As for the demographic data of the residents, it was found that there was no statistically significant difference between males and females in terms of their satisfaction rate, and that no significant difference was found in terms of job type, i.e. governmental or private, while the same results was found concerning the age. Finally, there was no significant difference between residency history and residential satisfaction level.
Health Education In Increasing Self-Efficacy In The Treatment Of Tuberculosis Patients At Tamalanrea Makassar Health Center
Authors: Yasir Haskas  , Sriwahyuni Sriwahyuni  , Muh. Chandra Adhitya Fairil
Published: November 2023

Tuberculosis is an infectious disease caused by the bacterium Mycobacterium tuberculosis which spreads through the air (Airborne disease).symptoms of cough with phlegm for 2 weeks or more.Disease prevalenceTB (Tuberculosis)as many as 845,000 with a death rate reaching 98,000 cases, treatment coverage is only 67%, several factors cause unhealthy housing, education and non-compliance with treatment inutritional indicators, immune levels, greatly influence the quality of life of tuberculosis sufferers so that there is a need to increase self-efficacy in managing the disease,with education about the infectious disease tuberculosis The research method used was pre-experimental with a one group pre-test and post-test design with a sample size of 36 people. The instrument we used was a pre- and post-questionnaire and provided intervention in the form of health education. The results of the research showed that after health education was carried out, the Negative Ranks data showed that respondents' scores from pre-post 3 respondents experienced a decrease in self-efficacy regarding tuberculosis treatment after health education, while the positive ranks data showed that 12 respondents' scores from pre-post experienced an increase. Self-efficacy towards tuberculosis treatment after health education, and the tie data shows that 21 respondents got a fixed score from pre-post after health education. The results of the Wilcoxon statistical test obtained a p value = (0.020) <α (0.05), and so The alternative hypothesis (Ha) is accepted. The conclusion is that there is an influence of health education on increasing self-efficacy in the treatment of tuberculosis sufferers at the Tamalanrea Makassar Community Health Center
Pendampingan Kepada Masyarakat Tentang Pre Eklamsia Pada Ibu Hamil Di Puskesmas Kassi-Kassi Kota Makassar
Authors: Fitriani Fitriani  , Hasiba hasiba  , Ayu ayu
Published: November 2023

preeclampsia is one of the most common medical problems that occurs during pregnancy, and is the main cause of maternal death in the world and in indonesia, therefore it is very important for pregnant women to be trained about the condition during pregnancy and learn appropriate self-care to prevent and control its occurrence. Preeclampsia. However, there are still pregnant women and people who do not have the knowledge and skills about the danger signs of preeclampsia, efforts to treat and prevent preeclampsia. So this service activity is carried out to teach and assist pregnant mothers about pre-eclampsia so that their knowledge increases and they can prevent pre-eclampsia. The method in this activity is a pre-test before carrying out the activity of providing information related to pre-eclampsia, then continuing with the post-test to see the success of the activity. The results of the activities of 13 targets who experienced preeclampsia showed that there were 11 pregnant women with good knowledge and 2 pregnant women with poor knowledge after providing counseling and assistance. This indicates that pregnant women with preeclampsia have more good knowledge after assistance
Pemberdayaan Keluarga Dalam Pencegahan Stunting Di Nagari Pariangan Kabupaten Tanah Datar
Authors: Rahmadani Yusran  , Deprianto Deprianto  , Abdul Hakim  , Vikry Alvi Putra  , Zaky Wirananta
Published: November 2023

Stunting is a problem that is specifically faced by the world, this is indicated by the increasing occurrence of disturbances in the development and functioning of a child's mental and monitoring conditions. The problem of stunting should not be ignored by the government,because the problem of stunting will greatly impact children's vulnerability to facing life, children who are considered stunted will be more easily exposed to disease and experience severe mental difficulties. The implementation method used is the qualitative research method, the underlying thing is because the implementation of community service activities takes direct data on the field and the Jorong Padang Panjang auxiliary health center. As well as taking additional information from books, journals and the internet so that the fulfillment of information regarding stunting and balanced nutrition is more complete. The implementation of this empowerment is expected that later the community will be able to understand and understand stunting and be able to apply it in life. The focus of this stunting activity is not only on toddlers and children but also aimed at women who are of childbearing age, as well as family members within the scope of the house and fulfillment of nutrition must be prepared early on even before pregnancy.