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Introducing the management of non traumatic rhegmatogenous retinal detachment in pediatric patient in the context of a genetic syndrome associated with failure of type 2 collagen synthesis which manifests itself in ocular , hearing , facial , bone and joint abnormalities. We describe the clinical presentation of the picture and surgical repaire technique consisted of lensectomy , vitrectomy , peeling of vitreoretinal proliferation membranes , giant retinal tear management and prolonged tamponade by silicone oil. Long term clinical follow-up was carried out. We highlight this case report to be a therapeutic challenge in a deaf and high myopic child , with motor disabilities and atypical vitreoretinal disorders have generated difficulties in surgical resolution , there is also little scientific reference in world literature and represent a clinical model of abnormal vitreoretinal interaction

The design of structures with re-entrant angle is often the consequence of the functional, architectural or urbanistic requirement. With any form building, the engineer has full responsibility to ensure the safety of the users and the structure in the case of the earthquake. However, re-entrant angle structures have geometric dissymmetry and limited choice in the disposition of rigid structural elements. The objective of this work is to evaluate the effect of the angle formed between the two wings of an L-shaped building, softened by a transition on their dynamic behavior. Different variants were considered by taking several angle values (45°, 60°, 75°, 90°, 105°, 120° and 135°). In order to evaluate the impact of the analyzed parameter, a study of the linear and non-linear dynamic behavior of the different structures was executed by the spectral modal analysis method and the non-linear static analysis. According to the atypical geometrical configuration in the plan of the various structures, six principal seismic directions were considered Ex, Ey, Ex’, Ey’, Ex” and Ey”. The results show that seismic excitation applied on the transition zone of a building with projected parts occurs a higher deformability. In addition, along this seismic direction, the progressive pushing of a uniform lateral loading applied on the structure with a projections opening angle of 90° assures a better nonlinear behavior in terms of base shears bearing capacity, deformation ductility and damage level.

This paper aims to investigate some properties of recycled aggregates concrete (RAC) containing various amount of recycled concrete aggregates (RCA) supplied from different parent concrete strength. Three concretes with different strengths were made. After hardening, they were crushed and the obtained RCA were used to substitute 20%, 40% and 60% of coarse ordinary aggregates (COA) in concrete mix. The properties of these RCA according to their parent concrete strength were analyzed and their effects on the workability, compressive strength and shrinkage were quantified. Concrete workability and final shrinkage seem to be related to the equivalent water absorption of coarse recycled aggregates. An equivalent granular expression can be used in classical model to predict compressive strength according to the RCA content and its parent concrete strength.

This paper presents an experimental investigation for testing the effect of elevated temperature on the hydration heat and mechanical properties of blended cement mortars. Two tests on mortars were made. The first set of mortars is tested of mechanical properties at various temperatures of 20, 35 and 50°C and the second test consists to determine the hydration heat by a semi-adiabatic calorimeter at isothermal temperature of 20, 35 and 50°C during seven days. The new empirical equation has been proposed to estimate the compressive strength depending on the hydration heat for blended cement preserved in constant temperature at early. The results founded from this relationship illustrate a good accuracy with the experimental ones and reflect the best choice to be used to predict the compressive strength depending on the heat of hydration at early age (7 days).

Diabetes is considered a risk factor for complications due to COVID-19. In order to clarify this association, we are exploring the characteristics, the clinical signs, the outcomes and death in diabetic patients with COVID-19. In this retrospective observational study we are evaluating the demographic characteristics, the comorbidities of the patients, the clinical signs of the infection, the signs of clinical severity, the biological assessment at admission, the treatment, the outcomes and the deaths of 133 patients with COVID-19, of which 25 (19,4%) had diabetes. In the compared COVID-19 patients, with and without diabetes, the patients with diabetes were older, had higher blood pressure and more cardio-vascular diseases. Severe forms were more present in diabetic patients (56% versus 27.1%). Weight loss was higher in diabetic patients (6kg versus 3kg). Biologically, diabetic patients had higher levels of C reactive protein (28 versus 5.8mg/l), procalcitonin (0.28 versus 0,13ng/l), ferritin (501 versus 140ng/ml), lactic dehydrogenase (268 versus 226IU/l) and of D. Dimer (665 versus 444μg/l). Diabetic patients required more oxygen therapy (60% versus 26.9%), more mechanical ventilation (20% versus 8.3%) and more frequent admission to the intensive care unit (60% versus 27.8%). They presented more thromboembolic complications (12% versus 9%) but there were not significant differences in the other outcomes and in death rates. The excess of morbidity and mortality due to diabetes was still not fully clarified; the role of demographic factors, the interaction of mediations with ACE-2 receptors and the role of co-morbidities will all need to be studied in order to identify the patient at risk profile, i.e. who can develop severe forms of the diseases and more outcomes. The early identification of a possible hyperinflammation could be very valuable. More attention should be paid to patients with COVID-19 with diabetes because they are at a high risk of complications.

Le rhabdomyosarcome est la tumeur mésenchymateuse la plus fréquente chez l'enfant et l'adolescent. Il représente 60 à 70% des tumeurs mésenchymateuses et environ 5% de l'ensemble des tumeurs solides à ces âges. Près de la moitié des rhabdomyosarcomes surviennent au niveau de la tête et du cou. Nous rapportons le cas d'un rhabdomyosarcome agressif à localisation temporo-pariétale. Chez un jeune adolescent de 20 ans avec une forme histologique nouvelle.

La lipectomie abdominale est l'une des interventions les plus habituelles de la chirurgie plastique. Néanmoins certaines spécificités peuvent donner lieu à une dermo- lipectomie atypique. Le cas décrit ici présente des singularités à la fois morphologiques, étiologiques et thérapeutiques. Il s'agit d'une patiente d'origine africaine obèse, diabétique, présentant deux volumineux tabliers abdominaux, l'un supra et l'autre infra ombilical. Une atrophie cutanée majeure avec de larges vergetures ressemblant à des cicatrices chéloïdes avec une fragilité extrême de la peau qui s'arrache au moindre traumatisme. Il s'agit de complications de la dépigmentation artificielle. Il a été réalisé une Dermolipectomie abdominale '' centrifuge '' à double étage: in situ sans décollement cutané, sans transposition de l'ombilic, préservant la peau centrale de meilleure qualité, en deux temps opératoires (un pour chaque étage). Le choix d'une dermolipectomie atypique, sans décollement et en deux temps, vise à corriger une déformation atypique en minimisant les risques de complications (infection, nécrose, désunion) dans un contexte de diabète, d'obésité non traitée et de fragilité cutanée, tous trois facteurs de risque de morbidité post-opératoire.

The use of certain organic additives in the production of mortar and concrete influences the workability and the hydration kinetic of mortar. This results in a modification of some properties, namely rheological behavior and mechanical strength. The objective of this work is to evaluate the rheological and mechanical behavior of a mortar by varying the fineness of the cement and using the superplasticizer Polycarboxylate.

Décrit la première fois par Virchow en 1860, le liposarcome est une tumeur mésenchymateuse rare. Cette rareté est relative car les liposarcomes représentent quand même 14 à 18 % de l'ensemble des tumeurs malignes des parties molles et ils constituent le plus fréquent des sarcomes des parties molles. Pour la majorité des auteurs, il ne se développerait jamais sur un lipome ou une lipomatose préexistant. Nous rapportons un cas de volumineux liposarcome de la face dorsale du tronc. L'histoire de la maladie, l'aspect clinique inhabituel '' de tumeur dans tumeur , l'aspect de la pièce opératoire nous fait évoquer la possibilité de la transformation maligne d'un lipome bénin préexistant.

The 2008 global financial crisis has rekindled the debate over the scientific foundations of neo-Classical econometrics. Neo-Classical based econometrics interprets whatever it sees as individuals choosing with some degree of (perhaps bounded) rationality. It simply relates observables to one another, putting choices and actions together into equilibrium patterns. But is this methodology of neo-Classical economics an adequate foundationfor structural econometrics? To answer this question the paper reconsiders Hollis and Nell’s examination of the relationship between positivism and the methodology of neo-Classical economics. The paper then goes on to determine whether or not, and in which sense, the Hollis and Nell’s (1975) Framework can be considered as “foundations” for a reconstruction of structural econometrics. The paper further extends and develops the position exposed by Hollis and Nell (1975)’s Rational Economic Man and, inspired by a novel re-reading of Haavelmo’s Manifesto (1944), compares the two works, arguing that there are good reasons for considering Hollis and Nell’s (1975) framework as “foundations” for reconstructing structural econometrics, extending the original ideas of Haavelmo’s (1944) work.