Analyse tectono-sédimentaire de la serie continentale Eocène du Djebel El-Kohol, près de Brézina (revers sud de l'atlas saharien) Algerire

L'analyse sédimentologique de 1'Eockne continental du Djebe El -Kohol (Brézina, revers sud de 1'Atlas saharien) a permis de mettre en évidence I'origine des dépots. L'interprétation des milieux de sédimentation et leur environnement t~enct ompte de l'analyse séquentielleverticale.Deux zones sont distinctes:d´une part, une zone proximale correspondants aux paléoreliefs du domaine atlasique émergé i la fin du Crétacé et sans cesser rajeunis par des mouvements compressifs et d'autre part, une zone distale s.1. ou zone d'enfoncement et comblement bien illustrée par une sédimentation diversifiée (évaporites, détritiques fins et grossiers) et oh sont observés des phénomknes de transformation par épigénie Les épandages détritiques d'El Koholproviennent essentiellement de l'érosion de 1'Atlas saharien durant la phase compressive intense d'age éockne largement ressentie dans les domaines tello-rifain et pyrénéo-provencal

Surfactant-aided impregnation of MnF2 into CNT fabrics as cathode material with high electrochemical performance for lithium ion batteries

© 2018 Elsevier Ltd MnF2 infiltrated-CNT fabrics was prepared by surfactant-aided impregnation of MnSiF6 precursors in acid-treated CNT fabric followed by annealing MnSiF6-loaded CNT fabric. The structural and morphological characterizations by X-ray diffraction, scanning electron microscopy (SEM), and transmission electron microscopy (TEM) confirmed the formation of MnF2 nanoparticles (average size: 20–30 nm) within CNT fabric structure. Galvanostatic charge-discharge tests of CNT-MnF2 nanocomposite fabrics showed excellent electrochemical performance and good cycle stability between 0.4 and 4.0 V vs Li/Li+. A specific capacity of 388 mAh/g was measured at 0.1C for CNT-MnF2 fabric with 70% MnF2 loading after 100 cycles. Stable cyclability and good rate performance were obtained at high charge-discharge cycling rates. MnF2 loading largely affect the performance of MnF2 infiltrated-CNT fabrics cathodes when lower than 70% MnF2 loaded-CNT fabrics were prepared. It can be concluded that nano-sized active materials infiltrated inside conductive carbon matrix in optimized content can lead to rapid kinetics and stable performance for flexible metal fluoride-based cathode materials.This work was funded by a grant from the Qatar National Research Fund under its National Priorities Research Program award number NPRP7-567-2-216 . Its contents are solely the responsibility of the authors and do not necessarily represent the official views of the Qatar National Research Fund . The authors are thankful to Prof Gleb Yushin from Georgia Institute of Technology for his collaboration in this subject

Analyse tectono-sédimentaire de la serie continentale Eocène du Djebel El-Kohol, près de Brézina (revers sud de l'atlas saharien) Algerire

L'analyse sédimentologique de 1'Eockne continental du Djebe El -Kohol (Brézina, revers sud de 1'Atlas saharien) a permis de mettre en évidence I'origine des dépots. L'interprétation des milieux de sédimentation et leur environnement t~enct ompte de l'analyse séquentielleverticale.Deux zones sont distinctes:d´une part, une zone proximale correspondants aux paléoreliefs du domaine atlasique émergé i la fin du Crétacé et sans cesser rajeunis par des mouvements compressifs et d'autre part, une zone distale s.1. ou zone d'enfoncement et comblement bien illustrée par une sédimentation diversifiée (évaporites, détritiques fins et grossiers) et oh sont observés des phénomknes de transformation par épigénie Les épandages détritiques d'El Koholproviennent essentiellement de l'érosion de 1'Atlas saharien durant la phase compressive intense d'age éockne largement ressentie dans les domaines tello-rifain et pyrénéo-provencal

Upper urinary tract disease: what we know today and unmet needs

PURPOSE: Upper tract urothelial carcinoma (UTUC) is a rare and poorly investigated disease. Intense collaborative efforts have increased our knowledge and improved the management of the disease. The objective of this review was to discuss recent advances and unmet needs in UTUC. METHODS: A non-systematic Medline/PubMed literature search was performed on UTUC using the terms "upper tract urothelial carcinoma" with different combinations of keywords. Original articles, reviews and editorials in English language were selected based on their clinical relevance. RESULTS: UTUC is a disease with specific epidemiologic and risk factors different to urothelial carcinoma of the bladder (UCB). Similarly to UCB, smoking increases the risk of UTUC and worsens its prognosis, whereas aristolochic acid (AA) exposure and mismatch repair genes abnormality are UTUC specific risk factors. A growing understanding of biological pathways involved in the tumorigenesis of UTUC has led to the identification of promising prognostic/predictive biomarkers. Risk stratification of UTUC is difficult due to limitations in staging and grading. Modern imaging and endoscopy have improved clinical decision-making, and allowed kidney-sparing management and surveillance in favorable-risk tumors. In high-risk tumors, radical nephroureterectomy (RNU) remains the standard. Complete removal of the intramural ureter is necessary with inferiority of endoscopic management. Post-RNU intravesical instillation has been shown to decrease bladder cancer recurrence rates. While the role of neoadjuvant cisplatin based combination chemotherapy and lymphadenectomy are not clearly established, the body of evidence suggests a survival benefit to these. There is currently no evidence for adjuvant chemotherapy (AC) in UTUC. CONCLUSIONS: Despite growing interest and understanding of UTUC, its management remains challenging, requiring further high quality multicenter collaborations. Accurate risk estimation is necessary to avoid unnecessary RNUs while advances in technology are still required for optimal kidney-sparing approaches

Catalytic Degradation of 4-Ethylpyridine in Water by Heterogeneous Photo-Fenton Process

In this work, the degradation of 4-ethylpyridine (4EP) in water by a heterogeneous photo-Fenton process (H2O2/Fe3O4/ultraviolet irradiation (UV)) was investigated. More rapid and effective 4EP degradation was obtained with H2O2/Fe3O4/UV than Fenton-like (H2O2/Fe3O4) and UV/H2O2, which is due to the larger production of hydroxyl radicals from the chemical and photolytic decomposition of H2O2. The operational conditions were varied during 4EP degradation experiments to evaluate the effects of pH, catalyst, concentration, and temperature on the kinetics and efficiency of H2O2/Fe3O4/UV oxidation. Under optimal conditions (100 mg/L 4EP, [H2O2] = 1000 mg/L, Fe3O4 = 40 mg/L, pH = 3 and room temperature, 300 rpm), 4EP was totally declined and more than 93% of the total organic carbon (TOC) was eliminated. Liquid chromatography analysis confirmed the formation of aromatic and aliphatic intermediates (4-hydroxypyridine, 4-pyridone, malonic, oxalic, and formic acids) that resulted in being mineralized. Ion chromatography analysis demonstrated the stoichiometric release of NH4+ ions during 4EP degradation by heterogeneous photo-Fenton oxidation. The reuse of the heterogeneous catalyst was evaluated after chemical and heat treatment at different temperatures. The heat-treated catalyst at 500 °C presented similar activity than the pristine Fe3O4. Accordingly, heterogeneous photo-Fenton oxidation can be an alternative method to treat wastewaters and groundwater contaminated with pyridine derivatives and other organic micropollutants. The combination of heterogeneous photo-Fenton oxidation with classical biological methods can be proposed to reduce the overall cost of the treatment in large-scale water treatment plants. View Full-TextQatar National Librar