73 research outputs found
Simulation fine d'optique adaptative à très grand champ pour des grands et futurs très grands télescopes
No full textLa simulation fine de systèmes d'OA à grand champ de type MOAO ou LTAO pour l'ELT se heurte à deux problématiques: l'augmentation du nombre de degrés de liberté du système. Cette augmentation rend les codes de simulation classiques peu utilisables, en particulier en ce qui concerne les processus d'inversion et de calcul matriciel. La complexité des systèmes, combinant EGL et EGN, grands miroirs déformables couvrant tout le champs et des miroirs dédiés dans les instruments eux mêmes, des rotations différentielles de pupille et ou de champs. Cette complexité conduit aux développements de procédures nouvelles d'étalonnage, de filtrage et fusion de données, de commande distribuée ou globale. Ces procédures doivent être simulées finement, comparées et quantifiées en termes de performances, avant d'être implantées dans de futurs systèmes. Pour répondre à ces deux besoins, le LAM développe en collaboration avec l'ONERA un code de simulation complet, basé sur une approche de résolution itérative de systèmes linéaires à grand nombre de paramètres (matrices creuses). Sur cette base, il incorpore de nouveaux concepts de filtrage et de fusion de données pour gérer efficacement les modes de tip/tilt/defocus dans le processus complet de reconstruction tomographique. Il permettra aussi, de développer et tester des lois de commandes complexes ayant à gérer un la combinaison du télescope adaptatif et d'instrument post-focaux comportant eux aussi des miroirs déformables dédiés.La première application de cet outil se fait naturellement dans le cadre du projet EAGLE, un des instruments phares du futur E-ELT, qui, du point de vue de l'OA combinera l'ensemble de ces problématiques.Refined simulation tools for wide field AO systems on ELTs present new challenges. Increasing the number of degrees of freedom makes the standard simulation's codes useless due to the huge number of operations to be performed at each step of the AO loop process. The classical matrix inversion and the VMM have to be replaced by a cleverer iterative resolution of the Least Square or Minimum Mean Square Error criterion. For this new generation of AO systems, concepts themselves will become more complex: data fusion coming from multiple LGS and NGS will have to be optimized, mirrors covering all the field of view associated to dedicated mirrors inside the scientific instrument itself will have to be coupled using split or integrated tomography schemes, differential pupil or/and field rotations will have to be considered.All these new entries should be carefully simulated, analysed and quantified in terms of performance before any implementation in AO systems. For those reasons i developed, in collaboration with the ONERA, a full simulation code, based on iterative solution of linear systems with many parameters (sparse matrices). On this basis, I introduced new concepts of filtering and data fusion to effectively manage modes such as tip, tilt and defoc in the entire process of tomographic reconstruction. The code will also eventually help to develop and test complex control laws who have to manage a combination of adaptive telescope and post-focal instrument including dedicated DM
SIMULATION FINE D'OPTIQUE ADAPTATIVE A TRES GRAND CHAMP POUR DES GRANDS ET FUTURS TRES GRANDS TELESCOPES
No full textRefined simulation tools for wide field AO systems (such as MOAO, MCAO or LTAO) on ELTs present new challenges. Increasing the number of degrees of freedom (scales as the square of the telescope diameter) makes the standard simulation's codes useless due to the huge number of operations to be performed at each step of the Adaptive Optics (AO) loop process. This computational burden requires new approaches in the computation of the DM voltages from WFS data. The classical matrix inversion and the matrix vector multiplication have to be replaced by a cleverer iterative resolution of the Least Square or Minimum Mean Square Error criterion (based on sparse matrices approaches). Moreover, for this new generation of AO systems, concepts themselves will become more complex: data fusion coming from multiple Laser and Natural Guide Stars (LGS \ NGS) will have to be optimized, mirrors covering all the field of view associated to dedicated mirrors inside the scientific instrument itself will have to be coupled using split or integrated tomography schemes, differential pupil or/and field rotations will have to be considered, etc. All these new entries should be carefully simulated, analysed and quantified in terms of performance before any implementation in AO systems. For those reasons i developed, in collaboration with the ONERA, a full simulation code, based on iterative solution of linear systems with many parameters (use of sparse matrices). On this basis, I introduced new concepts of filtering and data fusion (LGS / NGS) to effectively manage modes such as tip, tilt and defoc in the entire process of tomographic reconstruction. The code will also eventually help to develop and test complex control laws (Multi-DM and multi-field) who have to manage a combination of adaptive telescope and post-focal instrument including dedicated deformable mirrors.\\ The first application of this simulation tool has been studied in the framework of the EAGLE multi-object spectrograph project, one of the main instrument of the future E-ELT, which, in terms of adaptive optics combine all of these issues.La simulation fine de systèmes d'OA a grand champ de type MOAO, MCAO ou LTAO pour l'ELT se heurte a deux problématiques: L'augmentation du nombre de degrés de liberté du système (au carre du diamètre du télescope). Cette augmentation rend les codes de simulation classiques peu (ou pas) utilisables, en particulier en ce qui concerne les processus d'inversion et de calcul matriciel. Il faut donc envisager des approches d'inversion itératives d'un modèle direct y = A * x en s'appuyant sur les théories d'optimisation a base de matrices creuses. La complexite des systèmes, combinant des étoiles naturelles et laser, de grands miroirs déformables couvrant tous le champs et des miroirs dédiés dans les instruments eux memes, des rotations différentielles de pupille et ou de champs. Cette complexité conduit aux développements de procédures nouvelles d'étalonnages, de filtrages et fusion de données, de commandes distribuée ou globale. Ces procédures doivent être simulées finement, comparées et quantifiées en termes de performances, avant d'être implantées dans de futurs systèmes. Pour répondre a ces deux besoins. J'ai développé en, collaboration avec l'ONERA, un code de simulation complet base sur une approche de résolution itérative de systèmes linéaires a grand nombre de paramètres (utilisation de matrices creuses). Sur cette base, j'ai introduit de nouveaux concepts de filtrage et de fusion de données (étoiles laser et étoiles naturelles) pour gérer efficacement les modes de tip/tilt/defoc dans le processus complet de reconstruction tomographique. Ce code permettra aussi, a terme, de développer et tester des lois de commandes complexes (multi-DM et multi-champs) ayant a gérer la combinaison du télescope adaptatif et d'instrument post-focaux comportant eux aussi des miroirs déformables dédiés. La première application de cet outil s'est faite naturellement dans le cadre du projet de spectrographe multi-objets EAGLE, un des instruments phares du futur E-ELT, qui, du point de vue de l'optique adaptative combinera l'ensemble de ces problématiques
Simulation and neonatal nursing education
No full textOur world is shrinking due to computerized linkages and the mobility of society, and information is shared rapidly around the world. Newborn and infant health issues are global ones. In efforts to acknowledge the international community, each Newborn and Infant Nursing Review issue presents a column that highlights care-related issues from a featured country or region of the world. This month, Australia is featured. Our guest author is Mrs Manal Kassab, BSN, MSN, PhD, and Regional Network Contact for the Council of International Neonatal Nurses for Australia. This month's article focuses on Simulation and Education
Generalized multiscale finite element methods for the reduced model of darcy flow in fractured porous media
No full textIn this work, we combine the generalized multiscale finite element method (GMsFEM) with a reduced model based on the discrete fracture model (DFM) to resolve the difficulties of simulating flow in fractured porous media while efficiently and accurately reducing the computational complexity resulting from resolving the fine scale effects of the fractures. The geometrical structure of the fractures is discretely resolved within the model using the DFM. The advantage of using GMsFEM is to represent the fracture effects on a coarse grid via multiscale basis functions constructed using local spectral problems. Solving local problems leads to consideration and usage of small scale information in each coarse grid. Besides, the multiscale basis functions, generated following GMsFEM framework, are parameter independent and constructed once in what we call offline stage. These basis functions can be re-used for solving the problem for any input parameter when it is needed. Combining GMsFEM and DFM has been introduced in other works assuming continuous pressure across the fractures interface. This continuity is obtained when the fractures are much more permeable than that in the matrix domain. In this work, we consider a general case for the permeability in both fracture and matrix domain using the reduced model presented in Martin et al. (2005). The proposed reduction technique has significant impact on enabling engineers and scientist to efficiently, accurately and inexpensively solve the large and complex system resulted from modeling flow in fractured porous mediaThe first author Manal Alotaibi would like to acknowledge the support provided by the Department of Mathematics at King Fahd University of Petroleum & Minerals (KFUPM) under Start-up Research Grant number . The work of Huangxin Chen was supported by the NSF of China (Grant No. 12122115, 11771363)The work of Shuyu Sun was supported by King Abdullah University of Science and Technology (KAUST) through the grants BAS/1/1351-01, URF/1/4074-01, and URF/1/3769-0
Identification of Factors Influencing Continuation of Breastfeeding among Women in Saudi Arabia
No full text<p><strong>Abstract:</strong> Breastfeeding is a crucial component of infant health and development, with well-documented advantages, making it a national priority in Saudi Arabia. However, despite its importance, exclusive breastfeeding rates remain suboptimal. This review explores factors influencing the continuation of breastfeeding among Saudi women. The literature search strategy focused on articles in English published between 2015 and 2023, examining both qualitative and quantitative research. The review covers the composition of breast milk, its nutritional value, and storage, highlighting its unique benefits over formula feeding. It underscores the importance of exclusive breastfeeding, even for HIV-infected mothers, as recommended by the WHO. The review emphasizes the benefits of breastfeeding for both mothers and infants, including reducing infant mortality and protecting mothers from certain health risks. Furthermore, it delves into maternal knowledge and the reciprocal relationship between society and individuals, underscoring how cultural beliefs, societal support, and personal factors influence breastfeeding continuation. The review summarizes key factors, such as maternal knowledge, cultural beliefs, social support, and workplace policies, that play a vital role in promoting and sustaining breastfeeding among Saudi women. Tailored interventions and programs can address these factors to enhance breastfeeding rates in the Saudi Arabian context.</p><p><strong>Keywords:</strong> Breastfeeding, Cultural beliefs, Health benefits, Maternal knowledge, Saudi Arabia, Social support, Workplace policies, Infant development, Maternal health.</p><p><strong>Title:</strong> Identification of Factors Influencing Continuation of Breastfeeding among Women in Saudi Arabia</p><p><strong>Author:</strong> Manal Y. Kashmeri</p><p><strong>International Journal of Novel Research in Healthcare and Nursing</strong></p><p><strong>ISSN 2394-7330</strong></p><p><strong>Vol. 10, Issue 3, September 2023 - December 2023</strong></p><p><strong>Page No: 249-260</strong></p><p><strong>Novelty Journals</strong></p><p><strong>Website: www.noveltyjournals.com</strong></p><p><strong>Published Date: 08-November-2023</strong></p><p><strong>DOI: </strong><a href="https://doi.org/10.5281/zenodo.10121653"><strong>https://doi.org/10.5281/zenodo.10121653</strong></a></p><p><strong>Paper Download Link (Source)</strong></p><p><a href="https://www.noveltyjournals.com/upload/paper/Identification%20of%20Factors%20Influencing-08112023-5.pdf"><strong>https://www.noveltyjournals.com/upload/paper/Identification%20of%20Factors%20Influencing-08112023-5.pdf</strong></a></p>
Innovative optical design combining freeform optics and curved freeform sensors
No full textInternational audienceInnovative optical designs combing freeform optics and curved freeform sensors will be key elements to improve the optical performance and reduce the overall manufacturing and testing pressure of optical complex systems. In this paper, three version of unobscured all-reflective TMA-type telescopes (D=10cm, FOV=7°×7°) will be designed separately with flat sensor, spherical sensor and freeform sensor. Then, we will analyze and compare their imaging quality (RMS spot radius) and surface complexity (PV sag departure and Max slop departure) to demonstrate the advantage of freeform sensor applied in the off-axis optical system. Finally, we make comparison on sensitivity analysis of surface error between mirror surfaces and freeform sensor surfaces to prove that the manufacturing pressure of the sensor did not increase even though its surface complexity increased. We expect that such a design has a great potential to be applied in the space weather monitoring and solar system planetary exploration drones
The Knowledge of Palliative Care and the Attitude Toward It Among the Nurses at Sabia General Hospital 2018
No full textBackground: The aim of this study is to assess the knowledge of Palliative Care and the attitude toward it among the nurses working in Sabia General Hospitals and to find out the association between the nursing staff, knowledge, attitude, and selected demographic variables.
Material and Methods: The author performed a cross-sectional descriptive survey using a self-administered questionnaire. The total number of completed and returned questionnaires was 53, giving a 100% response rate. The study was conducted between December 2017 and January 2018 and a simple random sampling was performed among 53 nurses working in the Sabia General Hospital.
Methodology: For data collection, a self-administrative questionnaire was developed and used for assessment by the researcher. Nurses' socio-demographic characteristics such as their age, gender, nursing qualification, department of work, work experience, training in caring terminally ill clients, and their knowledge of and attitude toward palliative care were assessed; the relation between socio demographic data and knowledge and attitude was also assessed. Results showed that respondents had fair knowledge of palliative care 27 (50.9%) and fair attitude 30 (56.6%). It was proved that there is a significant relation between knowledge and demographic data; p-value is 0.004.
Conclusion: Nurses showed poor knowledge toward palliative care and half of them showed a fair attitude
WITHDRAWN: Towards secure clouds
No full textThis article has been withdrawn at the request of the author(s) and/or editor. The Publisher apologizes for any inconvenience this may cause.The full Elsevier Policy on Article Withdrawal can be found at http://www.elsevier.com/locate/withdrawalpolicy
Effect of Educational Intervention on Pediatric Diabetes self Care Practices
No full textAbstract: Background: Diabetes mellitus is among the most common chronic illnesses in childhood, it is a chronic metabolic condition affecting the child’s physical and physiological growth and development. Aim of the study: Study the effect of educational intervention on pediatric diabetes self care practices. Research design: A quasi experimental design (one group pre/post test) was used in the study. Settings: The present study was carried out at pediatric outpatient unit affiliated to Suez Canal University Hospitals and Health Insurance Hospital at Ismailia city. Sample: A non probability purposive sample (30) of diabetic children at the previously mentioned settings. Tools for data collection: The data were collected using two tools namely structured interview questionnaire and observational checklists to assess diabetes self care practices. Results: There was statistically significant difference in the total mean scores of satisfactory knowledge and self care practice pre/immediate post educational intervention. The total satisfactory knowledge was 100% immediate post educational intervention compared with 6.7% pre intervention. The total satisfactory level of self care practice was 100% immediate post educational intervention compared with 63.3% pre educational intervention. Conclusion: The educational intervention had a positive effect on children's diabetes self care practices. Recommendations: Periodic educational interventions are required to achieve positive change on diabetic children's self care practices.
Keywords: Diabetic children, educational intervention, Knowledge, Nursing, Practice.
Title: Effect of Educational Intervention on Pediatric Diabetes self Care Practices
Author: Hadeer Hussien Soliman, Wafaa El- Sayed Ouda, Manal Farouk Mohamed, Rehab Hassan Kafl
International Journal of Novel Research in Healthcare and Nursing
ISSN 2394-7330
Vol. 9, Issue 3, September 2022 - December 2022
Page No: 55-64
Novelty Journals
Website: www.noveltyjournals.com
Published Date: 27-September-2022
DOI: https://doi.org/10.5281/zenodo.7115915
Paper Download Link (Source)
https://www.noveltyjournals.com/upload/paper/Effect%20of%20Educational%20Intervention-27092022-1.pdfInternational Journal of Novel Research in Healthcare and Nursing, ISSN 2394-7330, Novelty Journals, Website: www.noveltyjournals.co
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