THE EFFECTS OF REDUCED GAMES FOR THE DEVELOPMENT OF THE QUALITY OF SPEED IN THE YOUNG ALGERIANS FOOTBALLERS

Physical quality is an important factor in the modern football and especially the speed, which we considered it necessary to investigate on the article "The effects of games reduced for the development of the quality of speed in the young soccer players of Algerians under the age 14yo in the club of me R. Mécheria", considering that the speed in soccer seems to be neglected in the training (formation) at the level of the young soccer players. Being essential in soccer, our research work recommends using the reduced games (sets) for improving speed qualities. So for our study, we chose the club of Mécheria; for that, we chose 20 players. The training program suggested realizing a positive development between both tests in the tests of speed in favour of the experimental group. This indicates the impact of the workout program in the evaluation of the level of the quality of speed in the (experimental) sample of the search (research). On the basis of all these results (profits) which were statistically significant, it is suggested the need of using the games (sets) reduced for the development of this quality.  Article visualizations

Structure de l’écoulement et de mélange dans un éjecteur supersonique gaz-gaz installé dans un système frigorifique d’une capacité de 10TR

The complexity of the flow in an ejector requires very careful visualization in order to describe the ejector behavior. This paper is based on a numerical simulation of the flow of R245fa through the gas-gas supersonic ejector installed in a real refrigeration system with a nominal capacity of 10 TR. The k-e RNG turbulence model is chosen for two modes of ejector operation, critical and sub-critical. Analysis shows that back pressure significantly affects both induced refrigerant flow and ejector operating regime. The use of the NIST-REFPROP database and a mesh adapted for each simulation allows to give results very close to the physical reality such that for the critical (on design) regime the relative errors do not exceed 4%, on the other hand, in under critical conditions (off design), they are of the order of 14%.La complexité de l’écoulement dans un éjecteur nécessite une visualisation très poussée afin de décrire le comportement de l’éjecteur. Cet article repose sur une simulation de l’écoulement de R245fa dans l’éjecteur supersonique gaz-gaz installé dans un système frigorifique réel d’une capacité nominale de 10 TR. Le modèle de turbulence k-e RNG est choisi pour deux modes de fonctionnement de l’éjecteur, critique et sous-critique. L’analyse montre que la contre-pression affect d’une façon significative, à la fois, le débit de réfrigérant induit et le régime de fonctionnement de l’éjecteur. L’utilisation de la base de données de NIST-REFPROP et un maillage adapté pour chacune de simulation permet de donner des résultats très proche à la réalité physique tel que pour le régime critique les erreurs relatives ne dépassent pas 4%, par contre, en régime sous critique, elles sont de l’ordre de 14%

Structure de l’écoulement et de mélange dans un éjecteur supersonique gaz-gaz installé dans un système frigorifique d’une capacité de 10TR

The complexity of the flow in an ejector requires very careful visualization in order to describe the ejector behavior. This paper is based on a numerical simulation of the flow of R245fa through the gas-gas supersonic ejector installed in a real refrigeration system with a nominal capacity of 10 TR. The k-e RNG turbulence model is chosen for two modes of ejector operation, critical and sub-critical. Analysis shows that back pressure significantly affects both induced refrigerant flow and ejector operating regime. The use of the NIST-REFPROP database and a mesh adapted for each simulation allows to give results very close to the physical reality such that for the critical (on design) regime the relative errors do not exceed 4%, on the other hand, in under critical conditions (off design), they are of the order of 14%.La complexité de l’écoulement dans un éjecteur nécessite une visualisation très poussée afin de décrire le comportement de l’éjecteur. Cet article repose sur une simulation de l’écoulement de R245fa dans l’éjecteur supersonique gaz-gaz installé dans un système frigorifique réel d’une capacité nominale de 10 TR. Le modèle de turbulence k-e RNG est choisi pour deux modes de fonctionnement de l’éjecteur, critique et sous-critique. L’analyse montre que la contre-pression affect d’une façon significative, à la fois, le débit de réfrigérant induit et le régime de fonctionnement de l’éjecteur. L’utilisation de la base de données de NIST-REFPROP et un maillage adapté pour chacune de simulation permet de donner des résultats très proche à la réalité physique tel que pour le régime critique les erreurs relatives ne dépassent pas 4%, par contre, en régime sous critique, elles sont de l’ordre de 14%

Artificial neural networks for vibration based inverse parametric identifications: A review

Vibration behavior of any solid structure reveals certain dynamic characteristics and property parameters of that structure. Inverse problems dealing with vibration response utilize the response signals to find out input factors and/or certain structural properties. Due to certain drawbacks of traditional solutions to inverse problems, ANNs have gained a major popularity in this field. This paper reviews some earlier researches where ANNs were applied to solve different vibration-based inverse parametric identification problems. The adoption of different ANN algorithms, input-output schemes and required signal processing were denoted in considerable detail. In addition, a number of issues have been reported, including the factors that affect ANNs’ prediction, as well as the advantage and disadvantage of ANN approaches with respect to general inverse methods Based on the critical analysis, suggestions to potential researchers have also been provided for future scopes

The evolving SARS-CoV-2 epidemic in Africa: Insights from rapidly expanding genomic surveillance

INTRODUCTION Investment in Africa over the past year with regard to severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) sequencing has led to a massive increase in the number of sequences, which, to date, exceeds 100,000 sequences generated to track the pandemic on the continent. These sequences have profoundly affected how public health officials in Africa have navigated the COVID-19 pandemic. RATIONALE We demonstrate how the first 100,000 SARS-CoV-2 sequences from Africa have helped monitor the epidemic on the continent, how genomic surveillance expanded over the course of the pandemic, and how we adapted our sequencing methods to deal with an evolving virus. Finally, we also examine how viral lineages have spread across the continent in a phylogeographic framework to gain insights into the underlying temporal and spatial transmission dynamics for several variants of concern (VOCs). RESULTS Our results indicate that the number of countries in Africa that can sequence the virus within their own borders is growing and that this is coupled with a shorter turnaround time from the time of sampling to sequence submission. Ongoing evolution necessitated the continual updating of primer sets, and, as a result, eight primer sets were designed in tandem with viral evolution and used to ensure effective sequencing of the virus. The pandemic unfolded through multiple waves of infection that were each driven by distinct genetic lineages, with B.1-like ancestral strains associated with the first pandemic wave of infections in 2020. Successive waves on the continent were fueled by different VOCs, with Alpha and Beta cocirculating in distinct spatial patterns during the second wave and Delta and Omicron affecting the whole continent during the third and fourth waves, respectively. Phylogeographic reconstruction points toward distinct differences in viral importation and exportation patterns associated with the Alpha, Beta, Delta, and Omicron variants and subvariants, when considering both Africa versus the rest of the world and viral dissemination within the continent. Our epidemiological and phylogenetic inferences therefore underscore the heterogeneous nature of the pandemic on the continent and highlight key insights and challenges, for instance, recognizing the limitations of low testing proportions. We also highlight the early warning capacity that genomic surveillance in Africa has had for the rest of the world with the detection of new lineages and variants, the most recent being the characterization of various Omicron subvariants. CONCLUSION Sustained investment for diagnostics and genomic surveillance in Africa is needed as the virus continues to evolve. This is important not only to help combat SARS-CoV-2 on the continent but also because it can be used as a platform to help address the many emerging and reemerging infectious disease threats in Africa. In particular, capacity building for local sequencing within countries or within the continent should be prioritized because this is generally associated with shorter turnaround times, providing the most benefit to local public health authorities tasked with pandemic response and mitigation and allowing for the fastest reaction to localized outbreaks. These investments are crucial for pandemic preparedness and response and will serve the health of the continent well into the 21st century

Effect of 8 weeks CrossFit exercises on high school students during a physical fitness program: Effect of 8 weeks CrossFit exercises

Purpose: The aim of this study was to assess the effectiveness of CrossFit exercises over a period of 8 weeks in a group of high school students during their physical education sessions at the school. and to mitigate the deficits in fitness caused by COVID-19 prevention measures. Material and methods: 94 students subject aged (16– 17) years were randomly allocated into an included 46 students (2nd level:12 men 11 women; 3rd level: 12 men 11 women)  and 1 control group included 48 students (2nd level:13 men 11 women; 3rd level: 13 men 12 women Experimental group (EG) that performed the 8 weeks CrossFit exercises and control group (CG). Physical fitness tests were done: lifting straight legs in height (number times); running on the spot with an intensity of 70% of the maximum to severe fatigue (c); "Shuttle" run 4 × 9 m (with); 60 m run (s) and cross twine (cm). Results: there are considering changes, development of the maximum dynamic force endurance, speed abilities, flexibility and mobility in the hip joints of the main groups, In the age aspect, there is mainly the improvement in results with age, both in the main and control groups (p>0,05). Conclusion: the study achieved a significant improvement in the physical condition of the students, also allows to talk about the effectiveness of training, built on the basis of a motivated choice of the target CrossFit high school program

Effect of 8 weeks CrossFit exercises on high school students during a physical fitness program

Purpose: The aim of this study was to assess the effectiveness of CrossFit exercises over a period of 8 weeks in a group of high school students during their physical education sessions at the school. and to mitigate the deficits in fitness caused by COVID-19 prevention measures. Material and methods: 94 students subject aged (16– 17) years were randomly allocated into an included 46 students (2nd level:12 men 11 women; 3rd level: 12 men 11 women)  and 1 control group included 48 students (2nd level:13 men 11 women; 3rd level: 13 men 12 women Experimental group (EG) that performed the 8 weeks CrossFit exercises and control group (CG). Physical fitness tests were done: lifting straight legs in height (number times); running on the spot with an intensity of 70% of the maximum to severe fatigue (c); "Shuttle" run 4 × 9 m (with); 60 m run (s) and cross twine (cm). Results: there are considering changes, development of the maximum dynamic force endurance, speed abilities, flexibility and mobility in the hip joints of the main groups, In the age aspect, there is mainly the improvement in results with age, both in the main and control groups (p>0,05). Conclusion: the study achieved a significant improvement in the physical condition of the students, also allows to talk about the effectiveness of training, built on the basis of a motivated choice of the target CrossFit high school program

Impact of fat mass distribution body shapes on muscles strength and the joints pain

Our study focuses on fat mass distribution body shapes type as measured to determine their effect on skeletal muscle strengthening lumbar extensors (upper and lower limbs) where our background confirms that every girl has a natural body type of rectangle, apple, pear, or hourglass. It is good for her to know which type of body shape she is, so she can learn what exercises to do, whereas similar studies suggest that it is much better to challenge weight problems with exercise and dietary measures before resorting to figure shaping. For this purpose, our study was carried out with a total of thirty students, females listed in the Institute of Physical Education and Sport, University of Mostaganem, aged between 20 and 23 years; their homogeneity was based on age, sex, and academic specialty, classified based on the body mass index (BMI) into two groups (normal and overweight) and based on their body shape′s type into three groups (9 pear shape, 10 rectangle shape, and 11 hourglass shape) as a protocol experimental to examine the impact of fat mass distribution body shapes type on lumbar extensor strength. Based on our data analysis, we confirm that the pear and the rectangle shape affect the strength lumbar extensors due to body weight distribution which increases the risks relating to the skeletal muscles. Weight gain is a factor contributing to the weakness of skeletal muscles. However, the body shape explains the anomalies of the distribution of fat mass and BMI risk observed in our sample in the lower and upper part of the body recorded by the values of Killy test and endurance of trunk, the case of the pear and the rectangle shape back pain, which are consisting in excess of the body fat distributed in comparison with less percentage of muscle mass. Whereas this difference can affect the pelvic position

Severe renal failure in acute bacterial pyelonephritis: Do not forget corticosteroids

Acute renal failure (ARF) is a rare complication of acute pyelonephritis in adult immunocompetent patients. Recovery of renal function usually occurs if antibiotics are promptly initiated. However, long-term consequences of renal scarring due to acute pyelonephritis are probably underestimated, and some patients present with prolonged renal failure despite adequate antibiotic therapy. We report two cases of severe ARF complicating bacterial pyelonephritis successfully treated with corticosteroids in association with conventional antibiotics