bluuebunny/crossref_metadata_2025 huggingface dataset:
Economic feasibility analysis of small-scale aquaculture of the endemic snailPomacea patula catemacensis(Baker 1922) from southeast Mexico
Authors: Mejía-Ramírez Miguel Ángel , Rocha Verónica Valadez , Pérez-Rostro Carlos Iván
Published: March 2020

The snailPomacea patula catemacensisis an endemic mollusk from the southeast Gulf of Mexico, which is commercially exploited and in decline since 2010. This decline is associated with an increasing market demand and illegal capture. We designed a small-scale production system forP. p. catemacensisand determined its financial feasibility for a base scenario. We used information gathered from stakeholders and stochastic modeling to predict the impact of uncertain variables on the economic indicators to assess the financial viability under varying conditions. The small-scale intensive production system, designed to yield 3.9 tons/year of unshelled product, requires an investment of about US $65,000. The production unit was financially assessed using the Modified Internal Return Rate and The Net Present Value of cash flow, considering a 14% discount rate and a 7% reinvestment rate. We obtained a Net Present Value of $67,000 and a Modified Internal Return Rate of 20% for the base scenario, which indicates the viability of the project. A Monte Carlo simulation was run to assess the robustness of the project to variability of three parameters: labor cost, energy cost, and market price; with random and simultaneous variation, resulting in 95% probability of getting a Modified Internal Return Rate larger than the current interest rate (8%) and a low probability (2.8%) to be financially unviable. This production system is worthy of consideration as an option to reduce the fishing pressure on the tegogolo natural populations of the Catemaco Lake while satisfying the market demand.
CO2 methanation over Co–Ni catalysts
Authors: Ishchenko Olena V. , Dyachenko Alla G. , Yatsymyrskiy Andrii V. , Zakharova Tetiana M. , Gaidai Snizhana V. , Lisnyak Vladyslav V. , Mariychuk Ruslan
Published: March 2020

One of the major goals when creating new energy systems is to provide clean and affordable energy. Currently, there is an excessive increase in the cost of fossil fuels and natural gas because of increased energy consumption and the inability to meet demand. That is why it is necessary to find reliable renewable energy sources and processes that will produce energy materials without toxic by-products in order to preserve the environment and to ensuring sustainable development and a strong economy. From environmental safety reasons, this need has led to the development of the catalytic synthesis of energetic materials from greenhouse gases; in particular, this paper proposes an efficient approach to producing methane by hydrogenation of carbon dioxide over Co–Ni catalysts.
Production efficiency of Poland farm-scale biogas plants: A case study
Authors: Pilarski Krzysztof , Pilarska Agnieszka A.
Published: March 2020

This paper provides the analysis of results of biogas and methane yield for: maize silage (MS), pig slurry (PS), waste potatoes (WP) and sugar beet pulp (SB). The results show that maize silage is the most energy substrate (among the samples tested), providing a cumulative methane yield from 595 to 631 m-3Mg VS (VS – volatile solids). The study was carried out in a laboratory scale using anaerobic batch reactors, at controlled (mesophilic) temperature and pH conditions. This paper is Part I of a report of an experiment carried out, in the laboratory scale and in the commercial scale (in parallel) The purpose of the experiment was to verify differences in biomethane yields of the same materials in the two scales. Moreover, this paper is an introduction to a presentation of the method to determine the biochemical methane potential correction coefficient (BMPCC), the details of which will be explained in Part II.
Analysis of the efficiency of a solid fuel boiler depending on the choice of combusted fuel
Authors: Pełka Grzegorz , Luboń Wojciech , Pachytel Przemysław
Published: March 2020

In the municipal and residential sector in Poland, as many as 50% of households are heated by solid fuel boilers. Most often these are, unfortunately, inefficient boilers, fired with low-quality coal. This study characterizes the market of boilers for solid fuels in Poland, and also presents the main apportionment of these devices, due to the different criteria that characterize them. The current legal changes in the scope of energy and emission requirements for solid fuel boilers are also discussed. The main purpose of this work is to analyze the real efficiency of the solid fuel over-fired boiler used, depending on the fuel burned in it. The process of burning selected fuels (seasoned wood, coal and pea coal) in the boiler was preceded by tests of these fuels to determine their energy parameters, such as moisture, ash content, the share of volatile matter and calorific value. In the next step, the energy efficiency obtained by the tested solid fuel boiler during the combustion of selected solid fuels was compared. The highest efficiency was achieved during the combustion of pea coal, and the lowest was achieved during the combustion of wood. In any case, the nominal efficiency value was achieved. Solutions that could improve the quality of the combustion process in this type of boiler were proposed.
Study of Methods of Biodiesel Neutralization with Aqueous Solution of Lymonic Acid
Authors: Polishсhuk Viktor , Tarasenko Svetlana , Antypov Ievgen , Kozak Nataliya , Zhyltsov Andrii , Okushko Oleksandr
Published: March 2020

At the article is to determining an effective way to neutralize biodiesel and install optimal and rational parameters of biodiesel neutralization. The investigation of the efficiency of biodiesel neutralization was carried out by mixing it with aqueous citric acid solution (volumetric method) and by spraying an aqueous solution of citric acid over a layer of biodiesel (aerosol method).
Effect of addition of coal sludge to polymeric material on thermal effects in analysis by TG/DTG/DSC methods
Authors: Kijo-Kleczkowska Agnieszka , Gnatowski Adam , Szumera Magdalena , Otwinowski Henryk , Kwiatkowski Dariusz , Suchecki Łukasz
Published: March 2020

The paper presents the application of thermal analysis methods in the study of various materials: coal sludge, polymeric material and composites of a polymer with coal sludge (fraction of coal sludge in composites: 1%, 3% and 5%). TG/DTG/DSC curves obtained during measurements in air atmosphere were analyzed. Polymers are used in many industries, that is why their thermal characteristics are so important. On the other hand, the mining industry, forced to supply power plants better quality fuel, must perform more thorough coal cleaning. This results in a continuous increase in waste in the form of coal sludge. The best method of disposing of these wastes is thermal utilisation (combustion and co-combustion), as well as use in composites with other materials.

The aim of the study was to demonstrate the effect of the addition of coal sludge to the polymer on the energetic effect and the rate of mass change of the material sample during the thermal process by TG/DTG/DSC methods.
The new design of the wood stove based on the numerical analysis and experimental research
Authors: Motyl Przemysław , Wikło Marcin , Bukalska Julita , Piechnik Bartosz , Kalbarczyk Rafał
Published: March 2020

In Europe, especially in Poland, wood-fired stoves remain one of the most popular renewable household heating. The use of wood logs in small-scale units stoves are expected to increase substantially. The work proposes a comprehensive approach to modify the design of wood stoves with heating power up to 20 kW, including design works, simulations, and experimental research. The article also presents the numerical study of a combustion process including fluid flow, chemical combustion reaction, and heat exchange in the wood stove. The retrofit enhanced a more stable heat release from the wood stove, which increased efficiency and reduction of the harmful components of combustion.
Conserving heat consumption by modeling and optimizing efficiency of complex heat exchanger systems
Authors: Wyleciał Tomasz , Urbaniak Dariusz , Barochkin A. E. , Zhukov V. P. , Leznova N. R.
Published: March 2020

Many needs have to be met in human life. One of the key needs is to provide living comfort, which is clearly associated with heat. Analyzing the amount of produced heat, it should be emphasized that the higher the development of a country, the greater the demand for heat. In the era of the debate on the impact of human activities on the climate, it is impossible not to emphasize the importance of conserving energy and heat, and thus the rational management of these goods. The paper proposes a mathematical description of the complex systems of heat exchangers in the form of linear differential equations. Their analytical solution is presented in the form of temperature change of the heat carrier along the heating surface of a four-thread heat exchanger. Analysis of the possible heat exchange cases for eight possible flow systems is presented. In addition, the most effective minimization of heat losses was found.
Assessment of options to reduce pollutant emissions in single-family houses in north-eastern Poland
Authors: Hałacz Joanna , Skotnicka-Siepsiak Aldona , Neugebauer Maciej , Nalepa Krzysztof , Sołowiej Piotr
Published: March 2020

The article presents the results of a study aiming to select the optimal source of heat for a newly designed single-family home. Commercial software was used to compare heating and ventilation systems involving a bituminous coal boiler, a condensing gas boiler, a biomass boiler, and a heat pump with water and glycol as heat transfer media. The effectiveness of natural ventilation, mechanical ventilation with a ground-coupled heat exchanger, and solar heater panels (flat and tubular) for water heating was evaluated. The analysis was based on the annual demand for useful energy, final energy and non-renewable primary energy in view of the pollution output of the evaluated heating systems. The analysis revealed that the heat pump with water and glycol as heat transfer media was the optimal solution. However, the performance of the heat pump in real-life conditions was below its maximum theoretical efficiency. The biomass boiler contributed to the highest reduction in pollutant emissions, but it was characterized by the highest demand for final energy. Mechanical ventilation with heat recovery was required in all analyzed systems to achieve the optimal results. Laboratory analyses confirmed the high efficiency of the tube heat exchanger in winter.
Education and research in the field of renewable sources of energy in the Centre Of Sustainable Development And Energy Savings WGGIOS AGH in Miekinia
Authors: Górecki Wojciech , Kotyza Jarosław , Hałaj Elżbieta , Luboń Wojciech , Pełka Grzegorz , Sowiżdżał Anna , Dawiec Dominika , Smaczna Paulina , Malik Daniel
Published: March 2020

The Centre of Sustainable Development and Energy Savings of the Faculty of Geology, Geophysics and Environmental Protection of AGH University of Science and Technology in Miekinia conducts research and educational activities in the field of renewable sources of energy, geothermal heat pumps especially. Growing interest in using the renewable energy sources (RES) is reflected upon the interest in such a discipline of studies. Many people declare intention of studying RES. This is a modern discipline, opened at AGH University of Science and Technology in 2003 as the first in Poland. Since 2012, when the Centre was open ca. 8000 people (including students, pupils, local governments and communities) were educated here. Not only geothermal energy is a main focus attention field. In the Centre other renewable sources of energy are also researched. This include solar energy (both photovoltaic and thermal), solid fuel boilers and wind energy.

The Centre is heated by heat pumps with ground sources which are simultaneously use by students for practice and measurements. There are didactic heat pumps with temperature and pressure sensors and electric meters to be used by students during measurements. The Centre is in disposal of self-constructed Thermal Response Test device for thermal parameters measurements. In a stand for testing ground-source brine heat pumps for central heating and hot domestic water preparation research are conducted on the COP heat pump efficiency in accordance with the PN-EN 14511 standard. The Centre works on the prototyping of new, innovative heat pumps.
Investigation of Termomodernized Building's Microclimate with Renewable Energy
Authors: Nalyvaiko Vitalii , Radko Ivan , Zhyltsov Andrii , Okushko Oleksandr , Mishchenko Anatolii , Antypov Ievgen
Published: March 2020

The values of indoor air temperatures in separate premises of the educational building of National University of Life and Environmental Sciences of Ukraine before and after the works on the thermo-modernization of the building were determined. A significant reduction in energy expenditure was achieved through the use of solar panels and solar collectors when changing the energy control algorithm and equipment for implementing this algorithm. The coldest rooms and premises with excess temperature are detected. The causes of uneven distribution of temperatures were analyzed. The possibility of equalizing the distribution of internal air temperatures and reducing the dependence of their values on fluctuations of external air temperatures is shown. With the help of the engineering methodology of calculation, energy efficiency of the so-called intermittent heating mode is demonstrated on the example of an educational room. It is shown that the use of the intermittent heating method can reduce energy consumption for heating. To further reduce energy costs, it is proposed to use a heat pump to compensate for peak loads and work at night at a special rate.
Hydrogen pump for hydrogen recirculation in fuel cell vehicles
Authors: Wiebe Wilhelm , Unwerth Thomas v. , Schmitz Sven
Published: March 2020

A promising alternative to fossil-fuelled vehicles are battery-powered vehicles and fuel cell (FC) vehicles. The major differences between fuel cell and battery-powered vehicles are the range and refuelling times of each vehicle type. With a hydrogen (Hed vehicles are the range and refuelling times of each vehicle type. With a hydrogen (H2) fuelling time of approx. 5 minutes it is possible to cover a distance of up to 800 km with a fuel cell vehicle. These properties make a fuel cell vehicle comparable to a fossil fuel powered vehicle. Furthermore, due to short fuelling times and long range capabilities, fuel cell vehicles are more suitable for long-distance, trucking and agriculture than battery-powered vehicles. The aim of current research is to increase the profitability of fuel cells by reducing costs and improving performance. To ensure a high performance of the fuel cell stack, more hydrogen is supplied to the stack than is needed for the reaction. Therefore, unused hydrogen is pumped back to the anode inlet of the FC-stack using a jet pump or a recirculation blower. In this study, the application of an electrochemical compressor or hydrogen pump (HP) for hydrogen recirculation is suggested. The hydrogen pump is an innovative H2 transport technology with the additional functions of compression and purification in the recirculation system. Hydrogen pumps are very efficient compared to mechanical compressors due to the almost isothermal conditions they operate under. Furthermore, due to the modular design, hydrogen compressors can utilize a minimal amount of space in vehicles.
A DFT study of diesel exhaust NOxreduction over rare earth CeO2catalyst
Authors: Huang He , Zhang Xiao
Published: March 2020

Adsorption of NO on the CeO2(110) surface was investigated using RPBE approach of GGA within the framework of density functional theory (DFT) combined with periodic slab model. Two molecular orientations, N-end and O-end, over various adsorption sites, top, hollow, bridge and O site of CeO2(110) sur-face have been considered. Two molecular orientations under different coverage of CeO2(110) surface also have been considered. The optimized results indicate that the N-end adsorption models are more stable than the O-end ones. So N-end adsorption was more favourable than O-end. NO adsorption on a clean CeO2(110) surface was physisorption, while chemical adsorption occurred in the present of surface oxygen vacancy. Adsorption is stable when coverage was set to 0.25 monolayer. Researched on density of states of free NO molecule and adsorbed NO molecule, the results show that there is an interaction between NO molecule and the substrate . The population analysis indicates that the charges transfer from Ce atoms to NO molecule. The charges transfer of O-end is more than N-end.
Wave propagation for a reduced model of blood coagulation
Authors: Ratto Nicolas , Marion Martine , Volpert Vitaly
Published: March 2020

Reduced mathematical models of blood coagulation can properly describe Thrombin Generation Test (TGT). Clot growth occurs as a reactiondiffusion wave, and the reduced model studied in this work describes this behaviour, preserving the differences observed between healthy and hemophilia subjects in the TGT.
Ostéotomies Segmentaires en Implantologie et en Chirurgie Orthognathique
Authors: Philippe B.
Published: March 2020

Les ostéotomies segmentaires qui consistent à mobiliser un fragment de la crête alvéolaire sont indiquées en implantologie pour restaurer un volume osseux insuffisant et/ou assurer un positionnement tridimensionnel satisfaisant de la crête alvéolaire. Si leur exécution avant linsertion des implants relève du bon sens, elles peuvent aussi être réalisées après la pose des implants pour supprimer une fausse gencive inesthétique et/ou recouvrer un positionnement et une orientation physiologique des implants. En chirurgie orthognathique, les ostéotomies segmentaires permettent de corriger certaines anomalies de locclusion et de l’os alvéolaire en complément ou en remplacement de lorthodontie. L’objectif de cette communication consiste à partir d’une série de 54 ostéotomies réparties chez 44 patients à présenter les indications, les principaux éléments de la technique opératoire et les principales complications per-opératoires et post-opératoires toujours possibles de ces procédures chirurgicales mal connues.
Blocs allogéniques d’origine fémorale en apposition horizontale : indications, intérêts et apport de la modélisation 3D
Authors: Milliez S.
Published: March 2020

Lefficacité clinique de blocs cortico-spongieux dallogreffe osseuse provenant de tête fémorale lors de greffe osseuse horizontale avant la pose d’implants dentaires est aujourdhui rapportée par de nombreuses études. La stabilité dans le temps de ces blocs osseux est parfois remise en cause. Le type de greffon (spongieux ou cortico-spongieux) et la chaine technologique utilisée pour traiter les blocs allogéniques sont des éléments primordiaux de la qualité du greffon.

La modélisation 3D des blocs allogéniques est une avancée significative en chirurgie pré-implantaire en adaptant le greffon allogénique à la morphologie du défaut osseux même important sur le cone beam pré-opératoire. Nous verrons les différentes étapes nécessaires à sa mise en place.
Flux de travail du guidage tridimensionnel en chirurgie orale
Authors: Elmoutawakkil N. , Bouzoubaa S. , Bellemkhannate S. , Benyahya I.
Published: March 2020

L’implantologie assistée par ordinateur permet de sécuriser le geste, de prévoir les potentielles complications, d’anticiper la séquence de forage et le choix de l’implant et donne la possibilité d’avoir une transition entre la simulation et la chirurgie à l’aide d’un guide chirurgical, elle est utilisée pour faciliter l’établissement d’un diagnostic précis et du plan de traitement idéal[1]. Dès que les images radiologiques (sous format DICOM) sont acquises suite à la réalisation d’une tomodensitométrie ou d’un cône-beam, elles sont transférées dans un logiciel de planification qui permettra la transformation des vues bidimensionnelles en une vision tridimensionnelle, pour évaluer la quantité et la qualité du volume osseux disponible et réaliser une représentation colorée et tridimensionnelle des éléments anatomiques présents sur les coupes dans le but de réaliser une simulation implantaire, Une fois placé, l’implant est visualisé immédiatement dans les trois plans de lespace, ensuite le praticien peut anticiper les caractéristiques du pilier, l’axe prothétique, et simuler l’épaisseur de la gencive. Ainsi un guide chirurgical à appui dentaire, muqueux ou osseux est conçu, à sa réception du guide, le fabricant fournit une feuille de route correspondant au système implantaire et à la trousse chirurgicale utilisée. Elle contient toutes les informations pour chaque implant et peut être complété par des cuillères et des porte-implants individualisés.Les résultats montrent que les écarts entre la réalité clinique et la planification émanent du type d’appui du guide. Un bio-modèle peut être imprimé en 3D, il servira comme outil pédagogique pour expliquer au patient le déroulement du projet et permettra également de réaliser une chirurgie « sèche » en amont de la pose d’implant ; et dans le cas de régénération osseuse guidée utilisant des grilles en titane il servira de support pour les préformer dans l’asepsie totale [2]. Les prothèses provisoires immédiates sont également réalisées au besoin, grâce à la superposition de la conception tridimensionnelle implantaire au modèle du patient scanné optiquement éviteant les erreurs de conception des prothèses immédiates. En oncologie buccale, la planification assistée permettra en segmentant la tumeur, de visualiser ses marges et sa taille, de réaliser un guide de résection et de customiser les plaques et les treillis imprimés en 3D. L’avènement de la conception et de la fabrication assistée par ordinateur a permis de révolutionner la chirurgie orale et de supprimer les erreurs opérateur dépendant en codifiant les actes, le travail présenté vise à décrire les différentes étapes du flux de travail optimal à adopter en chirurgie orale, permettant la réalisation de chirurgie totalement assistée, la conception et la fabrication de différents guides de forage et de résection osseuse ainsi que des prothèses provisoires immédiates [3].
Luxation bilatérale de l’articulation temporo-mandibulaire chez l’enfant
Authors: Sicard L. , Kaddour A.B. , O'Hana D. , Khonsari R.
Published: March 2020

La luxation bilatérale non-traumatique de l’articulation temporo-mandibulaire est une pathologie aiguë qui peut évoluer vers la chronicité ou la récurrence. Chez l’enfant, peu de cas ont été rapportés dans la littérature et aucun protocole de prise en charge globale n’a été proposé à ce jour. 2 cas de luxation chronique de l’articulation temporo-mandibulaire chez le jeune enfant sont décrits et leur prise en charge discutée au vue des données issues de la littérature. Lors de la prise en charge de la phase aiguë, le protocole de sédation doit être particulièrement adapté au degré de coopération de l’enfant. La technique de réduction la plus utilisée reste celle de Nelaton. Le type de contention doit être également choisi au mieux pour permettre les fonctions de nutrition et la stabilité du dispositif. L’existence d’une chronicité doit orienter, selon les antécédents du patient, vers la recherche d’une pathologie neurologique, comportementale ou génétique. Les cas présentés sont associés pour l’un à une réponse comportementale d’opposition lors de l’alimentation, pour l’autre à des mouvements spastiques dans un contexte de dystonie. La prise en charge des récurrences sera celle de la pathologie sous-jacente, de manière médicamenteuse ou comportementale, le potentiel de croissance chez l’enfant limitant l’indication chirurgicale. Selon le contexte, l’usage d’injection de toxine botulique peut également être envisagée.
Hémangioendothéliome intravasculaire végétant lingual : à propos d’un cas
Authors: Nayl C. , Fenelon M. , Catros S. , Fricain J.C.
Published: March 2020

L’hémangioendothéliome intravasculaire végétant ou tumeur de Masson est une pathologie tumorale bénigne secondaire à la prolifération réactive de cellules endothéliales papillomateuses liées à un thrombus (Masson P., 1923). Il s’agit d’une tumeur vasculaire relativement rare qui représente 2% des tumeurs vasculaires des tissus cutanés et sous cutanés. Peu d’études rapportent sa localisation endobuccale, cependant il existe de nombreux cas dans la littérature décrivant sa prédilection pour la région cervicocranio- faciale (Lancaster et al, 1998). Un patient âgé de 71 ans, sans antécédents médico-chirurgicaux notables, était adressé à la consultation spécialisée de pathologie de la muqueuse buccale pour une tuméfaction de la face dorsale de la langue de découverte fortuite. Il s’agissait d’une lésion nodulaire d’un centimètre de grand axe, de coloration violacé et indolore. AU la palpation on ne retrouvait pas de battement. Une exérèse chirurgicale au laser diode a été réalisée sous anesthésie locale. Une incision jusqu’aux plans musculaires au niveau desquels s’insinuait la tumeur a été réalisée. Les suites opératoires ont été simples. Le patient a été revu à 3 mois sans signe de récidive. L’analyse anatomopathologique mettait en évidence un hémangioendothéliome intravasculaire végétant. La cicatrisation à 1 mois post-opératoire était satisfaisante. L’hémangioendothéliome intravasculaire végétant est une tumeur vasculaire bénigne dont l’étiopathogénie reste encore discutée. Trois formes sont décrites ; la forme primaire apparaissant dans des vaisseaux distendus, la forme secondaire à des lésions vasculaire préexistantes, et la forme extravasculaire (Bologna-Molina et al, 2010). Cependant, il a été observé que la majorité des cas d’hémangioendothéliome intravasculaire végétant, quel que soit leur type, sont associés à un thrombus (Korkolis et al, 2005). L’hémangioendothéliome intravasculaire végétant est une pathologie rare souvent confondue avec une malformation vasculaire ou une lésion maligne telle que l’angiosarcome. L’établissement d’un diagnostic positif est essentiel pour écarter le diagnostic différentiel d’angiosarcome et éviter toute chirurgie inutilement invasive pour le patient. La prise en charge de l’hémangioendothéliome intravasculaire végétant repose sur son exérèse.
Cartographie des cancers de la cavité orale chez l’enfant
Authors: Akerzoul N. , Chbicheb S.
Published: March 2020

Objectif : Étudier le profil épidémiologique et histopathologique des cancers oraux chez les enfants pris en charge au services d’hémato-oncologie pédiatrique, de stomatologie et de chirurgie maxillo-faciale à l’hôpital 20 Aout de Casablanca, et à l’hôpital des enfants de Rabat. Notre objectif est de définir l’importance de l’oncologie pédiatrique, en particulier celle affectant la cavité orale, et aussi pour décrire les cancers oraux chez les enfants, leurs fréquences et les leurs caractéristiques histopathologiques. MATÉRIEL ET MÉTHODES: Il s’agit d’une étude rétrospective de 126 enfants hospitalisés entre 2010 et 2013 dans le service d’hémato-oncologie pédiatrique, du département de stomatologie et de chirurgie maxillo-faciale, de l’hôpital 20 août de Casablanca et le département d’hémato-oncologie pédiatrique de l’hôpital des enfants de Rabat; dans lequel nous avons diagnostiqué un cancer confirmé de la cavité orale. RÉSULTATS: Dans notre échantillon, tous les groupes d’âge ont été touchés par le processus de la maladie, mais les âges entre [0-4] ans et entre [13-16] étaient les plus touchés avec une moyenne d’âge de 8 ans, et des extrêmes allant de 4 mois à 16 ans. Dans notre échantillon de population, nous avons noté une légère prédominance avec 50,7% des cas. Le lymphome non hodgkinien Burkitt était le type histologique le plus commun avec 35,2% des cas. Les joues représentaient la localisation la plus fréquente avec 37,9% des cas, alors que le maxillaire représentait 19,7% des cas. La chimiothérapie a été la thérapeutique exclusive la plus utilisée dans notre échantillon dans 67,6% des cas. CONCLUSION: Les caractéristiques épidémiologiques, cliniques et pathologiques des cancers de la cavité orale dans notre population ne sont pas différents des données de la littérature. Cependant, les parents manquent de conscience et de diagnostic tardif de ces les lésions qui semblent être responsables du profil dramatique des cancers oraux chez les enfants de la population marocaine.
Migraine faciale à expression dentaire, à propos de trois cas
Authors: Ceddaha Zibi A.
Published: March 2020

Migraine faciale à expression dentaire, à propos de trois cas. Anael CEDDAHA ZIBI1, Vanina LUCIANI2, Diane NGUYEN3, Audrey CHANLON3, Nathan MOREAU4,5 1 - Interne en chirurgie orale 2 - Etudiante en 6ème année de chirurgie dentaire, Faculté de Chirurgie dentaire, Université Paris Descartes 3 - Praticien attaché, consultation de diagnostic et traitement des douleurs chroniques oro-faciales, service de médecine bucco-dentaire, Hôpital Bretonneau, AP-HP, Paris 4 - Responsable de la consultation de diagnostic et traitement des douleurs chroniques oro-faciales, service de médecine bucco-dentaire, Hôpital Bretonneau, AP-HP, Paris 5 - MCU-PH en médecine et chirurgie orale, Faculté de Chirurgie Dentaire, Université Paris Descartes & Service de Médecine buccodentaire, Hôpital Bretonneau, AP-HP, Paris & Laboratoire de Neurobiologie Oro-Faciale, Université Paris Diderot La migraine est une affection neurovasculaire qui peut être invalidante, sa pathogénie n’est pas encore parfaitement élucidée aujourd’hui. Le plus souvent à type de céphalée, elle représente la céphalée primaire la plus fréquente. Si son diagnostic est aisé lorsqu’elle se présente sous forme de céphalée, il devient plus délicat devant des manifestations faciales de migraines moins typiques. Les migraines avec une atteinte oro-faciale stricte sont peu décrites dans la littérature. Notre étude portera sur trois cas de patients recrutés et suivis à la consultation douleur de l’hôpital Bretonneau ayant souffert de douleurs oro- faciales, étiquetées comme migraines. Ce diagnostic ayant été confirmé par la suite lors de leurs prise en charge en neurologie. Dans le cas des migraines à expression dentaire, la maladie si elle est méconnue risque d’entraîner des traitements dentaires abusifs et inadaptés, comme cela a été le cas pour ces trois patientes. L’errance diagnostique et la chronicité des douleurs engendrent une dégradation de la qualité de vie des malades, et impacte souvent leur relation affective et professionnelle. L’aspect économique des traitements dentaires à répétition chez ces patients n’est pas à négliger. Si la migraine est une maladie bénigne elle peut devenir invalidante. La forte prévalence des migraines dans la population générale et dans la population active en fait une des priorités de santé publique du fait de son retentissement économique. Les objectifs de la prise en charge thérapeutique prennent en compte l’éradication des facteurs déclenchant des crises, le traitement de la crise migraineuse, et un traitement de fond prophylactique lorsque la fréquence des crises est importante. La migraine demeure une maladie sous-diagnostiquée dans toutes ses formes d’expression. Un diagnostic précoce demeure pourtant indispensable pour une prise en charge optimale en particulier en cas de manifestations oro-faciales pures.
Recent Advances in Photocatalytic Decarboxylative Coupling Reactions in Medicinal Chemistry
Authors: McMurray Lindsay , McGuire Thomas M. , Howells Rachel L.
Published: March 2020

This review covers recent advances in decarboxylative photocatalysis applicable to the medicinal chemist. The review is not intended to be exhaustive, but instead is focussed on transformations that could be useful in the synthesis of drug-like compounds in order to highlight the utility of this methodology in the development of new pharmaceutical candidates.

1 Introduction

2 C–C Bond Formation

3 C–N and C–O Bond Formation

4 Fluorination and Trifluoromethylation

5 Hydrodecarboxylation

6 Protein Functionalisation

7 Conclusion
Dose Intensified Chemoradiation and Intraluminal Brachytherapy Improve Outcomes in Middle Third Carcinoma Esophagus: Experience from a Regional Cancer Center
Authors: R. Tanvirpasha C. , P. Siddanna R. , V. Bindu , T. Naveen , V. Lokesh
Published: March 2020

Introduction Esophageal cancer is known for its poor outcome despite multimodality treatment. In this study, we report our experience with concurrent capecitabine-based chemoradiotherapy followed by intraluminal brachytherapy (ILBT) for middle third esophageal cancer.

Materials and Methods Twenty patients of histology-proven middle third esophageal cancer were treated with 45 Gray (Gy)/25 fraction (fr) of external beam radiation on telecobalt using two-dimensional technique with concurrent cisplatin 40 mg/m2 weekly with five such cycles along with tablet capecitabine 825 mg/m2 twice daily for the first 2 weeks and last 2 weeks of radiotherapy. This was followed by ILBT of 4 Gy × 3 fr placed 1 week apart from a total biologically effective dose of 60 Gy. Patients were followed up with clinical examination and serial barium swallow to assess response and toxicity.

Results Out of 20 patients, disease-free survival at 2 years was 60%. At 5 years, the actuarial survival was 47% with five patients alive and two patients lost to follow-up at 3 years. One patient had grade 3 toxicity in the form of tracheoesophageal fistula (5%). Two patients had distal failure. Two patients had second primary tumor in the upper aerodigestive tract at the end of 7 years.

Conclusion A combination of chemotherapy with cisplatin and capecitabine given concurrently with radical radiation therapy followed by ILBT boost is a safe and feasible protocol in the treatment of carcinoma esophagus involving middle third of esophagus. The local control and survival are comparable to historical studies with minimal toxicity.
Cystic Vestibular Schwannomas and Post–Gamma Knife Radiosurgery-Induced Necrosis of Vestibular Schwannomas: Report of Two Cases and Review of Literature
Authors: Ravikanth Reddy , Majumdar Pooja , Pinto Denver Steven
Published: March 2020

Cystic vestibular schwannomas (VS) form a rare subgroup that differs from the solid variant clinically and radiologically. Certain unique features reported in cystic VS are larger size, presentation with atypical initial symptoms such as dysgeusia, vertigo, facial pain and gait unsteadiness, short duration of symptoms, rapid progression of symptoms or sudden deterioration and frequent involvement of facial nerve. Gamma Knife radiosurgery (GKRS) is a safe and effective treatment for VS, achieving tumor control and resulting in a very low morbidity rate. Here, we described two cases of cystic vestibular schwannomas prior to GKRS and their radiological appearances post-GKRS.
MicroLEDs have a bright future in displays and medicine
Authors: Bandari Anashe
Published: March 2020

Reductions in the sizes of LEDs illuminate the path toward high-resolution applications from consumer electronics to medicine.
Twin-chain polymer hydrogels based on poly(vinyl alcohol) as new advanced tool for the cleaning of modern and contemporary art
Authors: Mastrangelo Rosangela , Chelazzi David , Poggi Giovanna , Fratini Emiliano , Pensabene Buemi Luciano , Petruzzellis Maria Laura , Baglioni Piero
Published: March 2020

Significance

From the earliest cave paintings of mankind, to Renaissance frescos and modern art masterpieces, the preservation of surfaces against soiling and degradation is fundamental to transfer such a vast heritage to future generations. However, traditional cleaning methods are often invasive and risky. We overcame these limitations by designing a cleaning system in the framework of colloid and materials science. We formulated twin-chain hydrogels with ideal mechanical properties, retentiveness, and interconnected porosity, allowing adhesion to rough and textured paint layers, and controlled wetting of surfaces, granting safe removal of soil. The gels were used to clean two Jackson Pollock masterpieces, recovering their visual aspect, marking a turning point in the field of conservation of important collections worldwide.
Photo-luminescence characteristics of binary P2O5–CaO glass ceramic
Authors: Xie Ning , Ming Chengguo , Hao Yanming , Pei Manting
Published: March 2020

To explore excellent colour display materials, the binary phosphate glass ceramics doped with R (R = Tm3+, Tb3+, Eu3+, Sm3+, and Mn2+) ions were prepared. The X-ray diffraction, transmission electron microscope, absorption, excitation, and emission spectra of the glass ceramics had been studied in detail. It was found that Ca2P2O7 and CaP2O6 had excited in the glass ceramics, which can improve the luminescent characteristics of the materials. The results show that the binary phosphate glass ceramics can display abundant colours, which is very helpful for developing the luminescent materials for colour display.
Trilingual Blunders: Signboards, Social Media, and Transnational Sri Lankan Tamil Publics
Authors: Davis Christina P.
Published: March 2020

In Sri Lanka all public signs are required by law to be in Sinhala, Tamil, and English. This article investigates the multiple, clashing ways that Sri Lankan Tamil speakers (Tamils and Muslims) living in-country and abroad interpret Tamil signage blunders in relation to the position of ethnic minorities in the postwar nation. I incorporate ethnographic interviews to examine how three Tamil speakers made sense of a signboard, displayed in several government buses in Colombo, in which the Tamil portion read “reserved for pregnant dogs” instead of “reserved for pregnant mothers.” I situate their responses in an account of the circulation of Tamil signage errors on Facebook. I argue that Tamil speakers’ disparate interpretations reflect contrasting semiotic ideologies concerning the intentionality of the blunders and the relationship between the posted signboard images and lived sociolinguistic practices (Keane 2003, 2018), which have implications for imagined postwar futures and transnational Tamil political activism.
Figure (of Personhood) Drawing: Scaffolding Signing and Signers in Nepal
Authors: Hoffmann-Dilloway Erika
Published: March 2020

This article explores how the affordances of pictorial representations of sign language forms (as enacted by illustrated signers) impact institutional processes of enskillment to sign language use. First, I attend to the participation framework roles such images inhabit in processes through which deaf teachers work to socialize novice signers to control the viewpoint reversals fundamental to local signing practices. I then explore how novice signers’ participant roles in relation to these images shift as they transition from animating the pictorially represented signs to performing them in ways aimed at yielding identification with the portrayed figures of personhood. Finally, through an analysis of a pictorially illustrated Nepali Sign Language version of Nepal’s new national anthem, I show how the particulars of such figures have shifted in response to dramatic political changes following Nepal’s Maoist Civil War.
Resonant microwaves probing acoustic waves from an RF plasma jet
Authors: Platier B , Staps T J A , Hak C C J M , Beckers J , IJzerman W L
Published: March 2020

Microwave cavity resonance spectroscopy is introduced and demonstrated as a new approach to investigate the generation of acoustic waves by a pulsed radio-frequency driven atmospheric-pressure plasma jet. Thanks to recent advancements in the diagnostic method, the lower detection limit for pressure changes in air is ∼0.3 Pa. Good agreement with conventional pressure transducer measurements with respect to the temporal evolution, the pressure amplitude and the spectral response is found. Fourier analysis revealed that the acoustic waves induced by the plasma can most likely be attributed to standing waves in the discharge geometry. Additionally, the plasma-induced acoustic waves of a few (tens of) Pa are proposed as an active mechanism in plasma medicine.
Two-body abrasive wear behavior of woven basalt fabric reinforced epoxy and polyester composites
Authors: Chairman C Anand , Thirumaran B , Babu S P Kumaresh , Ravichandran M
Published: March 2020

The current research work focused on the abrasive wear behavior of the basalt fabric as reinforcement in epoxy and polyester composites. Traditional hand-layup technique is used to manufacture the composites. The mechanical characteristics of the basalt fiber reinforced composites have been reported. The two body abrasive wear behavior of the fabricated composites was conducted by using pin/ball on disc tester TR-20 disc equipment. Test were conducted at two different load of 5 N and 10 N, for various sliding distances of 25 m to 100 m at equal intervals with 400 grade grit of particle size 35 μm. Wear resistance of the composites were determined by calculated the specific wear rate of the composites. Basalt fiber as reinforcement in epoxy composites showed better wear resistance than basalt fiber as reinforcement in polyester composites. Wear mechanism of worn samples is conducted by using the Scanning Electron Microscopy (SEM).
Hydrothermal-solid state synthesis of Gadolinium aluminate nano whiskers with alkaline mineralizer
Authors: Qi Pengyuan , Zhong Jingyu , Dai Shiyu , Ma Weimin , Jiang Lili
Published: March 2020

Gadolinium aluminate (GdAlO3, GAP) nano whiskers were synthesized by the hydrothermal-solid state method, Fourier-transform infrared (FTIR), X-ray diffraction (XRD), scanning electron microscope (SEM) and thermogravimetry-differential thermal analysis (TG-DTA) were employed to analyze the phase change and the nucleation mechanism of GAP during calcing process. The results show that the precursor of GAP prepared by hydrothermal is (NH4)xGdAl(OH)y(NO3)z·nH2O. When the calcination temperature is higher than 900 °C, the precursor recrystallizes, forming the needle shape GAP under the synergistic effect factors. The best preparation conditions are as follows: ammonia water as mineralizer, pH = 9, calcination temperature 1100 °C and holding time 3 h.
Development of nutrition counselling resources for family medicine using the knowledge to action framework
Authors: Fitzgerald Jodi D , Andrade Jeanette M , Curl Sarah L , Smith Elena B , Torna Elena , Nelson Danielle S
Published: March 2020

Background

Obesity within the USA is a public health crisis. Nutrition counselling in primary care is an effective yet underutilized intervention because of both health care professional (HCP) barriers and patient barriers.

Objective

The purpose of this study was to: (i) identify HCP and patient perceptions, needs and barriers surrounding nutrition counselling, (ii) develop nutrition resources for HCPs and patients and (iii) assess utility of the approach.

Methods

Paper surveys were completed by 48 HCPs (response rate: 63.2%) and 185 patients in five family medicine clinics. Based on results, nutrition resources were developed and integrated into the electronic medical record. To assess utility, paper surveys were completed by 25 HCPs (response rate: 32.9%) after 4 weeks. Results were presented as descriptive statistics.

Results

Both HCPs and patients indicated that nutrition counselling is necessary to improve dietary behaviours, but barriers prevented HCPs from providing counselling and patients from improving dietary behaviours. HCPs indicated that improved patient handouts (74.5%), community nutrition classes (72.3%) and community cooking classes (63.8%) could enhance nutrition counselling. Patients identified that coupons and discounts (45.5%), sample meal plans and recipes (44.3%) and websites for recipes, grocery guides, and cooking videos (35.9%) would help them to consume a healthy diet. Patient education handouts, patient resource guides and HCP education were created. Following receipt, most HCPs (85%) indicated that the resources enhanced their nutrition counselling.

Conclusions

HCP and patient barriers to nutrition counselling are multiple and varied. Design and implementation of an approach tailored to stakeholders’ needs have potential to improve nutrition counselling in primary care.
Changes in Deadwood and Understory Vegetation 12 Years after Partial and Clearcut Harvesting in Mixedwood Stands of Western Quebec, Canada
Authors: Maleki Kobra , Lafleur Benoit , Harvey Brian D , Mazerolle Marc J , Fenton Nicole J
Published: March 2020

Ecosystem management promotes the integration of knowledge of natural ecosystem dynamics into forest-management planning and practices, and provides a useful framework for understanding and mitigating the impacts of timber harvesting on biodiversity and ecosystem functions. Understory vegetation and deadwood are involved in many ecosystem functions including nutrient and carbon, and tree-regeneration dynamics. The study objective was to compare the 12-year post-treatment effects on forest floor attributes of two intensities of partial harvesting (gap harvesting [62 percent basal area retention; BAR] and diameter-limit harvesting [35 percent BAR]) to clearcutting (10 percent BAR). We quantified the standing and downed deadwood abundance and the understory plant community composition in mixed, northern temperate forests, in western Québec, Canada. Our results suggest that moderate-intensity gap harvesting can best preserve a standing deadwood stem density and a diameter structure comparable to unmanaged stands. Downed deadwood abundance of all diameter classes was not altered, 12 years following the gap harvesting. Finally, understory plant communities in the gap treatment were more similar to those of unmanaged stands than those in diameter-limit and clearcutting treatments. These results illustrate the importance of tree retention levels for the maintenance of deadwood and understory plant species associated with closed-canopy or old-growth forests.
Shape optimization of stirring rods for mixing binary fluids
Authors: Eggl Maximilian F , Schmid Peter J
Published: March 2020

Mixing is an omnipresent process in a wide range of industrial applications, which supports scientific efforts to devise techniques for optimizing mixing processes under time and energy constraints. In this endeavour, we present a computational framework based on nonlinear direct-adjoint looping for the enhancement of mixing efficiency in a binary fluid system. The governing equations consist of the nonlinear Navier–Stokes equations, complemented by an evolution equation for a passive scalar. Immersed and moving stirrers are treated by a Brinkman penalization technique, and the full system of equations is solved using a Fourier-based pseudospectral approach. The adjoint equations provide gradient and sensitivity information which is in turn used to improve an initial mixing strategy, based on shape, rotational and path modifications. We utilize a Fourier-based approach for parameterizing and optimizing the embedded stirrers and consider a variety of geometries to achieve enhanced mixing efficiency. We consider a restricted optimization space by limiting the time for mixing and the rotational velocities of all stirrers. In all cases, non-intuitive shapes are found which produce significantly enhanced mixing efficiency.