In Mejez el Bab-Testour area, Triassic domes are the continuity of ech-Chehid dome, they result from polyphased halokinetic motion. The different setting stages can be deduced from the phenomena that ...occur within the Mesozoïc-Cenozoïc deposits ; reduction in thickness, progressive bevels, stratigraphie gaps, intraformational unconformities, hydroplastic deformations and reworking of Triassic mate¬ rial. During the Quaternary and Miocene shortening phases, these dome structures have acquired the current mushroom-shape and have thrusted Barremian to Plio-Quaternary series.
Les dômes de sels triasiques de la région de Mejez el Bab-Testour dans le prolongement nord est du dôme d'ech-Chehid, résultent d'une histoire halocinétique polyphasée. Les différentes phases halocinétiques sont enregistrées dans la couverture méso-cénozoïque par des phénomènes de réduction et de biseautage progressifs de séries, des lacunes stratigraphiques, des biseaux sédimentaires et des discordances intraformationnelles, des déformations hydroplastiques et des remaniements du matériel triasique. Lors des phases de serrage miocène et quaternaire, ces dômes ont acquis leur forme actuelle en "champignon" et ont chevauché des terrains allant du Barrémien jusqu'au Plio-Quaternaire.
Une étude tectono-sédimentaire des séries crétacées en Tunisie septentrionale (zone des dômes) permet de prouver que ces séries se sont déposées dans des bassins très fragmentaires, marqués par une ...halocinèse active et saccadée. La remobilisation des évaporites triasiques à différentes époques crétacées, a engendré des zones hautes diapiriques à sédimentation réduite et lacuneuse. Les corps triasiques se sont mis en place grâce à des structures diapiriques. effectuées le long de failles majeures. Ces variations ne sont pas uniquement liées aux structures en dômes triasiques mais aussi aux failles majeures qui ont délimité des hauts-fonds et des dépocentres dans un contexte distensif-décrochant.
A tectono-sedimentary study of Cretaceous series in Northern Tunisia (dome zone) shows that these series were deposited in a fragmentary basin characterized by a jerky and active halokinesis. The remobilization of Trisassic salt at different periods during the Cretaceous has created diapiric highs with lacunar and reduced sedimentation. The Triassic bodies were emplaced in diapiric structures bom in major faults. These variations aren't only linked to Triassic domes but also to major features which have delimited highs and depocenters in a distensive-strike slip context.
Biostratigraphy (Foraminifera) and tectonic control in the Upper Cretaceous series of Mejez El Bab area (Northern Tunisia).
The biostratigraphical analysis of the Cretaceous series which out crops in ...the Mejez el Bab area (Northern Tunisia) is based on the Foraminifera distribution found into numerous sections taken in this area (Jebel Kechtilou, Sidi Mohamed Akermi, Jebel Bou Rahal). This analysis permits to precise chronostratigraphy of different beds and to prove some thickness and fades changes and sedimentary hiatus in these area cretaceous series,
The fades and thickness changes and the sedimentary hiatus would be linked to an active synsedimentary tectonics. The last one had structured the sedimentary substratum in horsts and grabens. In the first structures numerous sedimentary hiatus and thickness decrease are observed. In the second structures (grabens), the Vraconian-Coniadan series are thick, complete and continuous such as in Sidi Mohamed Akermi location ; there, we have recognized all biozona of the Vraconian up to Coniacian stage. However, in Jebel Bou Rahal and Kechtilou (Koudiat ed-Damous), the Vraconian-Coniacian series are thin and occur some sedimentary hiatus such as the Early and Middle Cenomanian, of the Late Turanian to Early Coniacian or only the Early Coniacian. These thickness decrease and sedimentary hiatus are underlined especially in some shoals limited by submeridian, N40 to N70 and N140 faults. Nevertheless, in Jebel Bou Rahal was developped intraformational breccia deposited during the Upper Cenomanian to the Middle Turanian.
L'analyse biostratigraphique détaillée de la série crétacée affleurant dans la région de Mejez el Bab (Tunisie septentrionale) est basée sur la répartition des foraminifères dans de nombreuses coupes levées dans cette région (Jebel Kechtilou, Sidi Mohamed Akermi, Jebel Bou Rahal). Elle nous a permis de préciser l'âge de différents niveaux et de mettre en évidence des variations latérales d'épaisseur et de faciès, voire même des lacunes sédimentaires dans cette série.
Ces lacunes et ces variations d'épaisseur et de faciès seraient en liaison avec une tectonique synsédimentaire ayant engendré des structures en horst à sédimentation réduite voire même lacuneuse et des structures en graben à sédimentation épaisse et continue. En effet, dans la localité de Sidi Mohamed Akermi, située en domaine relativement plus subsident et là où la série vracono-coniacienne est complète, nous avons reconnu toutes les biozones caractéristiques de cet intervalle de temps. Aux Jebels Bou Rahal et Kechtilou (Koudiat ed-Damous), des réductions et des lacunes sédimentaires correspondent respectivement au Cénomanien inférieur à moyen, au Turonien supérieur-Coniacien inférieur et au Coniacien inférieur. Ces lacunes seraient en liaison avec l'installation de hauts-fonds limités par des failles subméridiennes, N40 à N70 et N140. Particulièrement au Jebel Bou Rahal, s'était développée une brèche intraformationnelle, équivalente des termes du Cénomanien supérieur à Turonien inférieur à moyen.
We prove existence and asymptotic behaviour results for weak solutions of a mixed problem (S). We also obtain the existence of the global attractor and the regularity for this attractor in ...$\leftH^{2}(\Omega )\right ^{2}$ and we derive estimates of its Haussdorf and fractal dimensions.
Metal organic frameworks (MOFs) are attracting significant attention for applications including adsorption, chemical sensing, gas separation, photocatalysis, electrocatalysis and catalysis. In ...particular, zeolitic imidazolate framework 8 (ZIF-8), which is composed of zinc ions and imidazolate ligands, have been applied in different areas of catalysis due to its outstanding structural and textural properties. It possesses a highly porous structure and chemical and thermal stability under varying reaction conditions. When used alone in the reaction medium, the ZIF-8 particles tend to agglomerate, which inhibits their removal efficiency and selectivity. This results in their mediocre reusability and separation from aqueous conditions. Thus, to overcome these drawbacks, several well-designed ZIF-8 structures have emerged by forming composites and heterostructures and doping. This review focuses on the recent advances on the use of ZIF-8 structures (doping, composites, heterostructures,
etc.
) in the removal and photodegradation of persistent organic pollutants. We focus on the adsorption and photocatalysis of three main organic pollutants (methylene blue, rhodamine B, and malachite green). Finally, the key challenges, prospects and future directions are outlined to give insights into game-changing breakthroughs in this area.
Metal organic frameworks (MOFs) are attracting significant attention for applications including adsorption, chemical sensing, gas separation, photocatalysis, electrocatalysis and catalysis.
This review paper provides a comprehensive overview of the recent trends in bismuth tungstate (Bi2WO6) research, covering its structural, electrical, photoluminescent, and photocatalytic properties. ...The structural characteristics of bismuth tungstate are explored in detail, including its different allotropic crystal structures with respect to its isotypic materials. The electrical properties of bismuth tungstate, such as its conductivity and electron mobility, are also discussed, along with its photoluminescent properties. The photocatalytic activity of bismuth tungstate is a particular focus, with recent advances in doping and co-doping strategies with metals, rare earth and other elements summarized. The limitations and challenges of using bismuth tungstate as a photocatalyst are also examined, such as its low quantum efficiency and susceptibility to photodegradation. Finally, recommendations for future research directions are provided, including the need for further studies on the underlying mechanisms of photocatalytic activity, the development of more efficient and stable bismuth tungstate-based photocatalysts, and the exploration of new applications in fields such as water treatment and energy conversion.
In the past decade, extensive research has been devoted to synthesis of ZIF-8 materials for catalytic applications. As physico-chemical properties are synthesis-dependent, this review explores ...different synthesis strategies based the solvent and solvent-free synthesis of zeolitic imidazole framework. Accordingly, the effect of several parameters on the ZIF-8 synthesis were discussed including solvent, deprotonating agents, precursors ratio is delivered. Additionally, the advantages and disadvantages of each synthesis have been discussed and assessed. ZIF-8 textural and structural properties justify its wide use as a stable high surface area MOF in aqueous catalytic reactions. This review includes the applicatios of ZIF-8 materials in photocatalytic hydrogen evolution reaction (HER). The efficiency of the reviewed materials was fairly assessed. Finally, Limitations, drawbacks and future challenges were fully debated to ensure the industrial viability of the ZIFs.
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•This review explores different synthesis strategies based the solvent and solvent-free synthesis.•Applications of ZIF-8 materials in photocatalytic hydrogen production.•The efficiency of the reviewed materials was fairly assessed.•Limitations, drawbacks and future challenges were fully debated.
Summary
Several studies have reported changes in body composition in rheumatoid arthritis (RA) and ankylosing spondylitis (AS). Our study showed that body composition measurements obtained by ...absorptiometry were highly reproducible in patients suffering from these diseases. This study justifies the use of absorptiometry measurements in longitudinal studies in this population.
Purpose
Our study aimed to assess the reproducibility of total and regional body composition in patients with rheumatoid arthritis (RA) and with ankylosing spondylitis (AS) and to compare them to healthy subjects.
Methods
The study enrolled 80 subjects including 32 healthy subjects, 31 RA patients, and 17 AS patients. Each subject had two scans in one day under the same standard conditions and none ate nor drunk before being repositioned on the table. The reproducibility was assessed through the coefficient of variation (CV), the least significant change (LSC), the intraclass correlation (ICC), and the smallest significant difference (SDD).
Results
Total body composition measurements obtained by dual-energy X-ray absorptiometry (DXA) were highly reproducible, and there was no statistically significant difference between reproducibility in healthy subjects, patients with RA, and patients with AS. For total body fat mass (FM), lean mass (LM), and bone mineral content (BMC) in the total population, CV values were 1.71%, 1.25%, and 1.74%, respectively; ICC values were 0.998, 0.996, and 0.993, respectively; LSC values were 4.88%, 3.7%, and 5.2%, respectively; and SDD values were ± 1.23 Kg, ± 1.47 Kg, and ± 126.0 g, respectively. For regional body FM, LM, and BMC in the total population, CV values in the arms were 8.46%, 4.17%, and 3.79%, respectively; in the legs 6.24%, 3.59%, and 2.04%, respectively, and in the trunk 5.02%, 2.92%, and 5.24%, respectively.
Conclusion
Total body tissue mass, FM percentage, FM, LM, and BMC measurements obtained by DXA are highly reproducible in RA and AS.
Despite of the availability of several effective bDMARDs, a significant proportion of rheumatoid arthritis (RA) and ankylosing spondylitis (AS) patients discontinued bDMARDs. The aims of this study ...were to analyze causes of bDMARDs discontinuation in RA and AS included in the Moroccan registry RBSMR. A historical prospective multicenter cohort study based on the RBSMR database at 12 months of follow-up, which included 225 RA and 170 AS. Using T student, Mann–Whitney U, chi-squared or Fischer exact tests, baseline demographic and clinical features were compared between patients discontinuing bDMARDs and patients remaining on initiated bDMARDs or switching bDMARDs. Logistic regression models were used to identify factors associated with drugs discontinuation. 61 RA discontinued bDMARDs and 47 AS interrupted anti-TNF. The most common reasons for drugs discontinuation were adverse events (7.5%) in RA patients and social security reimbursement problems (16.8%) in AS. RA patients discontinuing bDMARDs were more frequently first-line biological drugs users, more frequently female and had more comorbidities and lower DAS28 CRP than RA patients remaining on initiated bDMARDs or switching bDMARDs (
p
< 0.001,
p
= 0.01,
p
< 0.001 and
p
< 0.001 respectively). Female sex and comorbidities were the significant predictors of bDMARDs discontinuation in RA patients. Higher baseline BASDAI had a protective role on anti-TNF interruption in AS patients. Adverse events and social security reimbursement problems were the main reasons for drugs discontinuation in RA and AS patients respectively. Female sex and comorbidities in RA patients, baseline BASDAI in AS patients impacted bDMARDs discontinuation in real-life settings.
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