Sorption Study of a Basic Dye “Gentian Violet” from Aqueous Solutions Using Activated Bentonite

AbstractVarious industries like textiles, papers, food, plastics, leather, etc are great water and organic colorant users. Hence, the resulting effluents could be an important source of environmental problems, since they may contain stable and non biodegradable contaminants, like organic dyes. The treatment of which is the main scope of the present study. Different ways of dye removal from these effluents do exist, such as flotation, reverse osmosis, chemical flocculation and adsorption etc. Adsorption is used in this work for the removal of a particular basic dye, known as Gentian violet (GV) from an aqueous solution, by means of a natural clay material. The influence of various key parameters like contact time, temperature, ionic strength, etc. on the adsorbed amount of the dye was investigated, for batch conditions. A kinetic study was also carried out, the obtained experimental results were tested against the pseudo first order and the pseudo second order equations. An analysis of the obtained equilibrium data showed that the dye adsorption is best described by the Langmuir model. The obtained results showed that temperature did enhance the Gentian violet dye retention process onto the considered bentonite whereas the obtained thermodynamic parameters indicated that the adsorption process is spontaneous and endothermic. The simultaneous presence of methylene blue, which is another colorant compound, with the Gentian violet was also considered. The clay materials showed a better affinity for the first one i e. methylene blue. In conclusion and according to the obtained results, the clay material may be recommended as an industrial adsorbent for the treatment of effluents containing Gentian violet (GV)

Thomas Decomposition of Algebraic and Differential Systems

In this paper we consider disjoint decomposition of algebraic and non-linear partial differential systems of equations and inequations into so-called simple subsystems. We exploit Thomas decomposition ideas and develop them into a new algorithm. For algebraic systems simplicity means triangularity, squarefreeness and non-vanishing initials. For differential systems the algorithm provides not only algebraic simplicity but also involutivity. The algorithm has been implemented in Maple

Simplified DSP-Based Signal-Signal Beat Interference Mitigation Technique for Direct Detection OFDM

Short- and medium-haul links in interdata center, access, and metro networks require cost-effective direct-detection wavelength-division multiplexing transceivers offering energy efficiency, high information spectral density (ISD), and dispersion tolerance. Single-sideband orthogonal frequency-division multiplexing (SSB-OFDM) with direct detection is a potential solution; however, it suffers a penalty from signal-signal beat interference (SSBI) caused by the square-law photodetection. In this paper, a novel DSP-based SSBI mitigation technique, with lower complexity than previously proposed methods, is proposed and assessed through numerical simulations for the first time. The performance improvement is quantified by simulations of 9 × 112 Gb/s 16-QAM SSB-OFDM signal with a net optical ISD of 2.1 (b/s)/Hz. The performance is shown to be similar to that of the more complex receiver-based iterative SSBI compensation technique. Simulations predict an 8.7 dB reduction in the required OSNR at the 7% overhead HD-FEC threshold, and increases up to 100% in maximum reach over uncompensated standard single-mode fibre using the proposed simplified SSBI compensation technique

Simplified DSP-Based Signal-Signal Beat Interference Mitigation for Direct-Detection Subcarrier Modulation

We proposed a novel SSBI mitigation technique with significantly lower DSP complexity. It was experimentally tested in 7×25 Gb/s WDM DD SSB 16-QAM N-SCM signal transmission over 480 km SSMF with a net ISD of 2.4 (b/s)/Hz

ANEVRISME ROMPU DE L’ARTERE GASTRODUODENALE : HEMOSTASE PAR EMBOLISATION

Aneurysms of the gastroduodenal artery are rare vascular lesions with significantly higher risk of rupture, given the predominance of inflammatory causes. Rupture is frequently the initial symptom, and intraoperative isolation and control of the aneurysm can be difficult, it worsens the prognosis and increases mortality. The endovascular approach with embolization of the aneurysm offers in these cases the possibility of a primary hemostasis and allows secondly evacuation of the hemoperitoine on a stable and a well-prepared patient.We report a 72 year-old women, having benefited of an urgent haemostasis by embolisation of a ruptured gastroduodenal artery aneurysm and a secondary evacuation of her hemopéritoine 48 hours later. It was an embolization in a ruptured digestive artery aneurysm with an anatomic variant, the hepatic artery was arising from the superior mesenteric artery, and it makes all the particularity of this observation. In this paper we recall the diagnostical and etiological aspects of gastroduodenal artery aneurysms, we discuss the difficulties of their treatment and we emphasis the advantages of embolization in management of this type of complication.Les anévrismes de l'artère gastroduodénale sont des lésions vasculaires rares, la rupture en est un risque réel, il est significativement augmenté par la nature inflammatoire dominante de leurs étiologies. La rupture est un mode de révélation fréquent et souvent inaugurale, elle rend le contrôle chirurgical de l’artère gastroduodénale difficile, aggravant ainsi le pronostic et augmentant le taux de mortalité. L’approche endovasculaire par embolisation offre la possibilité d’une hémostase primaire en urgence et permet de reporter l’évacuation de l’hemopéritoine dans un deuxième temps sur un malade stable et bien préparé.Nous rapportons l'observation d'une femme de 72 ans, ayant bénéficiée d’une hémostase par embolisation d’un anévrisme rompu de l‘artère gastroduodénale en urgence et d’une évacuation secondaire de son hemopéritoine 48 heures après. Cette observation rapporte le cas d’une embolisation sur un anévrisme rompu d’une artère digestive avec une variante anatomique réalisée par l’artère hépatique qui nait de l’artère mésentérique supérieure, cela fait toute la particularité de cette observation. Dans ce travail nous rappelons les aspects diagnostic et étiologiques des anévrismes de l’artère gastroduodénale, nous discutons les difficultés de leur prise en charge en cas de rupture et nous mettant le point sur les avantages de l’embolisation primaire à visée hémostatique

Peculiar Size Effects in Nanoscaled Systems

In this minireview, we intend to shed light on relatively recent examples related to the size and shape effects on materials at the nanoscale and their usage to test a set of quantum mechanics governed phenomena

Intelligent control and security of fog resources in healthcare systems via a cognitive fog model

There have been significant advances in the field of Internet of Things (IoT) recently, which have not always considered security or data security concerns: A high degree of security is required when considering the sharing of medical data over networks. In most IoT-based systems, especially those within smart-homes and smart-cities, there is a bridging point (fog computing) between a sensor network and the Internet which often just performs basic functions such as translating between the protocols used in the Internet and sensor networks, as well as small amounts of data processing. The fog nodes can have useful knowledge and potential for constructive security and control over both the sensor network and the data transmitted over the Internet. Smart healthcare services utilise such networks of IoT systems. It is therefore vital that medical data emanating from IoT systems is highly secure, to prevent fraudulent use, whilst maintaining quality of service providing assured, verified and complete data. In this paper, we examine the development of a Cognitive Fog (CF) model, for secure, smart healthcare services, that is able to make decisions such as opting-in and opting-out from running processes and invoking new processes when required, and providing security for the operational processes within the fog system. Overall, the proposed ensemble security model performed better in terms of Accuracy Rate, Detection Rate, and a lower False Positive Rate (standard intrusion detection measurements) than three base classifiers (K-NN, DBSCAN and DT) using a standard security dataset (NSL-KDD)

Popliteal Artery Entrapment Syndrome in Children : Experience With Four Cases of Acute Ischaemia and Review of the Literature

Objective: Popliteal artery entrapment syndrome (PAES) is an uncommon anatomical anomaly, frequently described in adults. The most common symptom is claudication. Acute limb ischaemia (ALI) in children is rare, but it may evolve and lead to limb loss or lifelong complications. Clinical and surgical experience of PAES in children is reported. Data from the literature are analysed in order to assess the severity of this disease and to identify the factors characterising the diagnosis and the outcome of treatment in paediatric patients. Methods: Four children (aged 7-16 years) were referred with ALI due to PAES. Among the 439 articles reporting cases of PAES, 55 patients under 18 years of age were the focus. The PAES cases were classified according to the Love and Whelan classification modified by Rich. Results: Data from 79 children (106 limbs, 27 bilateral PAES) were collected and analysed. Type I PAES was present in 41 (39%), Type II in 23 (22%), Type III in 24 (23%), Type IV in 12 (11%), and Type V in two (2%) limbs. A functional PAES was present in one patient bilaterally. In two cases, the type of PAES was not reported. Claudication occurred in 68 cases (64%), and ALI in 19 (18%). In 60 cases (57%), revascularisation with or without myotomy was required; myotomy alone was performed in 41 cases (39%). Conclusions: Symptomatic PAES in children should be considered a severe condition requiring urgent investigation in order to avoid any delays in the treatment. Early diagnosis and treatment are essential to prevent serious complications. The long-term outcomes of surgical treatment with the correction of the anatomical anomaly and vascular reconstruction are satisfactory with a low complication rate. (C) 2017 European Society for Vascular Surgery. Published by Elsevier Ltd. All rights reserved.Peer reviewe