Leiomyosarcome Du Cordon Spermatique

Introduction: Leiomyosarcoma of the spermatic cord is a rare tumor, develops from the mesenchymal tissues of the spermatic cord, epididymis and  testicular tunics. Its incidence is 0.05 to 0.1% and the occurrence in the testis is rare. In the literature, the testicular leiomyosarcoma (LST) is reported as sporadic cases or as a very limited series. In adults, most testicular sarcomas are the result of a sarcomatous transformation of germ cell tumors (GCT) especially teratomas and spermatocytic sarcomas.Observation: We report on a pure paratesticular leiomyosarcoma and we present the histological, therapeutic and prognostic aspects of this rare tumor

Localisation Intravésicale d’une Broche d’ostéosynthèse (A Propos D’un Cas)

La variété de corps étrangers introduits dans l’appareil génito- urinaire défie l’imagination et peut confronter l’urologue aux difficultés de leur extraction. Si leur présence relève souvent d’une pratique douteuse d’origine psychiatrique, il faut noter la possibilité d’une migration à partir des espaces perivésicaux lors d’une chirurgie de voisinage ainsi qu’une introduction accidentelle durantune intervention transvésicale. Les symptômes du bas appareil urinaire, non spécifiques, sont les circonstances fortuites de découverte de corps étrangers intravésicaux. Bien que le pronostic vital ne soit pas engagé, l’extractionchirurgicale ou endoscopique s’avère nécessaire du fait de l’inflammation sévère associée aux dommages vésicaux secondaires à ce corps étranger.Nous rapportons le cas d’un jeune patient admis aux urgences chez qui on trouve une broche d’ostéosynthèse compliquée d’une lithiase située dans la vessie

Anti-AGEs Algerian vegetal extracts. Phytochemical study of Daucus aureus desf. (Apiaceae)

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H2 production via ammonia decomposition in a catalytic membrane reactor

The membrane reactor is proposed in this work as a system with high potential to efficiently recover the hydrogen (H2) stored in ammonia (NH3), which has been recently proposed as an alternative for H2 storage. With this technology, NH3 decomposition and high-purity H2 separation are simultaneously performed within the same unit, and high H2 separation efficiency is achieved at lower temperature compared to conventional systems, leading to energetic and economic benefits. NH3 decomposition was experimentally performed in a Pd-based membrane reactor over a Ru-based catalyst and the performance of the conventional packed bed reactor were used as benchmark for a comparison. The results demonstrate that the introduction of a membrane in a conventional reactor enhances its performance and allows to achieve conversion higher than the thermodynamic equilibrium conversion for sufficiently high temperatures. For temperatures from and above 425 °C, full NH3 conversion was achieved and more than 86% of H2 fed to the system as ammonia was recovered with a purity of 99.998%. The application of vacuum at the membrane permeate side leads to higher H2 recovery and NH3 conversions beyond thermodynamic restrictions. On the other hand, the reactor feed flow rate and operating pressure have not shown major impacts on NH3 conversion.This project receives support from the European Union’s Horizon 2020 research and innovation under grant agreement No. 862482 (ARENHA project)

Identification probabiliste des paramètres élastiques d'un circuit imprimé

Les systèmes mécatroniques embarqués sont soumis à des vibrations provoquant la rupture des joints brasés par fatigue. L'estimation de la durée de vie en fatigue est liée à la connaissance des propriétés dynamiques des matériaux du circuit imprimé. Dans cette communication l'identification du modèle probabiliste est effectuée à partir de mesures expérimentales réalisées par la technique de vibrométrie à balayage laser 3D. En outre, le problème inverse probabiliste vise à quantifier les incertitudes des propriétés des matériaux afin de mieux évaluer l'aléa de la réponse du modèle numériqu

Shear band dynamics from a mesoscopic modeling of plasticity

The ubiquitous appearance of regions of localized deformation (shear bands) in different kinds of disordered materials under shear is studied in the context of a mesoscopic model of plasticity. The model may or may not include relaxational (aging) effects. In the absence of relaxational effects the model displays a monotonously increasing dependence of stress on strain-rate, and stationary shear bands do not occur. However, in start up experiments transient (although long lived) shear bands occur, that widen without bound in time. I investigate this transient effect in detail, reproducing and explaining a t^1/2 law for the thickness increase of the shear band that has been obtained in atomistic numerical simulations. Relaxation produces a negative sloped region in the stress vs. strain-rate curve that stabilizes the formation of shear bands of a well defined width, which is a function of strain-rate. Simulations at very low strain-rates reveal a non-trivial stick-slip dynamics of very thin shear bands that has relevance in the study of seismic phenomena. In addition, other non-stationary processes, such as stop-and-go, or strain-rate inversion situations display a phenomenology that matches very well the results of recent experimental studies.Comment: 10 pages, 10 figure

Comparison of thermo-hydraulic performance among different 3D printed periodic open cellular structures

As additive manufacturing of periodic open cellular structures (POCS) is gaining interest in structured catalytic reactor research, this work seeks to thermohydraulically compare the well-known Kelvin lattice structure with the lesser-researched BCC and gyroid lattice structures. Using a combined CFD (Computational Fluid Dynamic) and experimental approach, the selected POCS are fabricated through Laser Powder Bed Fusion (LPBF), characterized, and subsequently subjected to numerical analysis. From the manufacturability point of view, the 3D printed samples closely matched their CAD designs, showing a maximum porosity deviation of 15% below design values. A CFD model, validated through pressure drop experiment, was employed to compare the POCS designs on shared geometric attributes such as specific surface area and porosity. While all structures exhibited comparable performance in term of heat and momentum transfer, our findings suggest that the Gyroid lattice may provide the optimal balance between momentum and heat transfer rates in low-velocity region. Conversely, the BCC configuration may be more favourable at higher velocity. An Ergun-like correlation was also developed and validated for each lattice type, with a Mean Absolute Percentage Error (MAPE) below 10%. Our pressure drop results align quite well with existing literature correlations, showing a MAPE under 20%. Concerning heat transfer, the values forecasted in this research show a reasonable alignment with literature's results, though they tend to be on the lower spectrum.</p

LEÓN, JOSÉ CLAUDIO DE Y SRA. [Material gráfico]

Copia digital. Madrid : Ministerio de Educación, Cultura y Deporte, 201