18 research outputs found
d-orthogonality of Little q-Laguerre type polynomials
No full textAbstractIn this paper, we solve a characterization problem in the context of the d-orthogonality. That allows us, on one hand, to provide a q-analog for the d-orthogonal polynomials of Laguerre type introduced by the first author and Douak, and on the other hand, to derive new Lq-classical d-orthogonal polynomials generalizing the Little q-Laguerre polynomials. Various properties of the resulting basic hypergeometric polynomials are singled out. For d=1, we obtain a characterization theorem involving, as far as we know, new Lq-classical orthogonal polynomials, for which we give the recurrence relation and the difference equation
An Evolutionary Approach to solve the Dynamic Multi-Hop Ridematching Problem
No full textInternational audienceThe multihop ridesharing system generates a ridematching solution with an arbitrary number of transfers that respects personal preferences of the users and their time constraints with detour willingness. As it is considered to be NP-complete, an efficient metaheuristic is required in the application to solve the dynamic multihop ridematching problem. In this context, a novel approach, called Metaheuristics Approach Based on Controlled Genetic Operators (MACGeO), which is supported by an original dynamic coding, is developed to address the multihop ridematching problem. The performance of the proposed approach is measured via simulation scenarios, which feature various numbers of carpool drivers (vehicles) and riders (passengers). Experimental results show that the multihop ridematching could greatly increase the number of matched requests while minimizing the number of vehicles required. © The Author(s) 2016
Deformed Heisenberg algebra with reflection and -orthogonal polynomials
No full textsummary:This paper is devoted to the study of matrix elements of irreducible representations of the enveloping deformed Heisenberg algebra with reflection, motivated by recurrence relations satisfied by hypergeometric functions. It is shown that the matrix elements of a suitable operator given as a product of exponential functions are expressed in terms of -orthogonal polynomials, which are reduced to the orthogonal Meixner polynomials when . The underlying algebraic framework allowed a systematic derivation of the recurrence relations, difference equation, lowering and rising operators and generating functions which these polynomials satisfy
Synthesis Report on the Co-design of Innovations for the Tunisian Agroecological Living Landscape
No full textThe report describes the process by which the Tunisian Agroecology Initiative co-designed innovations with the local communities of the Agroecological Living Landscape (ALL). It also explains the technologies selected, the experiments carried out and the main results obtained by the national partners. The experiments carried out relate to: i) forage mixtures, ii) rhizobial biofertilizers, iii) green fertility (impact of forage on animal health and productivity), iv) biochar as a soil amendment, v) valorisation of olive mill effluent and vi) agroforestry (intercropping of forages in olive groves). It reflects on the producer's perception of the co-designed process and agroecological practices and provides general and specific recommendations for the next cycle of co-designed technologies and experiments
بعض أعيان وآثار تلمسان من خلال كتاب "الرحلة الحبيبية الوهرانية..." لأحمد بن سكيرج الفاسي
No full textيعد أدب الرحلات من بين الحقول الخصبة التي نبغ فيها العرب قديما، وهو ما تشهد عليه كتب الأدب الجغرافي والتاريخي ومدوناتهم؛ بحيث تسدي لنا خدمات معلوماتية ذات قيمة بالغة في مجالها. ولهذا تعد كتب الرحلات من أهم المصادر الجغرافية والتاريخية والاجتماعية؛ لأن الكاتب يستقي معلوماته وحقائقه من مشاهد حية، وتصوير مباشر، مما يجعل قراءته مفيدة وممتعة ومسلية في الوقت نفسه. ولذا نجد التاريخ قد حفل بأسماء الكثير من أعلام هذا الأدب ورواده، الذين قاموا برحلات متعددة، خارج ديارهم أو داخلها، وطافوا بأنحاء شتى من العالم. ومن هؤلاء الرحالة الذين زاروا الجزائر خصوصا مدينة تلمسان؛ أحمد سكيرج المغربي(1295-1363هـ). صاحب الرحلة الحبيبية التي سنتعرض من خلالها لمدينة تلمسان وعلمائها وأعيانها وبعضا من آثارها حسب كتاب الرحلة. ويعتبر كتاب الرحلة الحبيبية للشيخ أحمد بن سكيرج من المؤلفات التاريخية والأدبية التي ألفها، ومن أهم مصادر تراث الرحلة التاريخية المغاربية. التي استقصت بعض أخبار المؤرخين وما صنفوه، والكتاب في أدب الرحلات؛ حيث يضم طائفة هامة من المعلومات التاريخية وبعض النبذ الشعرية والأدبية التي لها صلة بموضوع المحل الذي يكون فيه، كما ضم كتاب الرحلة ضمن موضوعاته الأخرى عروضا مهمة عن بعض المناظرات والمباحثات التي دارت بينه وبين علماء القطر الجزائري.و خصوصا علماء تلمسان الذين التقى بهم كالشيخ ابن ددوش والشريف سيدي محمد بن يوسف وابن خالة سيادة القاضي الرفيق السيد عبد الرحمن بن محمد الذيب التلمساني وصهره الأبر سيدي محمد بن محمد الذيب وغيرهم كثير. إلى جانب التنويه ببعض آثار المدينة من مساجد، جوامع وزوايا.La littérature du voyage est considérée comme l’un des champs les plus féconds où les Arabes ont excellé par le passé, comme en témoigne la littérature d’ouvrages géographiques, historiques qui nous fournissent des informations de grande valeur. Les auteurs puisent les informations et les faits à partir d’un vécu et d’un constat direct, rendant la lecture utile, agréable et divertissante. L’Histoire retient bien des noms de pionniers de ce champ qui ont accompli ce genre de voyage à l'extérieur ou à l'intérieur de leur pays.Parmi les voyageurs qui ont visité l’Algérie, en particulier la ville de Tlemcen, Ahmed Sekerj El Maghribi (1295-1363 AH), a écrit Er-Rihla El Habibia qui va nous permettre d’aborder le récit de la ville de Tlemcen, ses savants, ses notables et certains de ses vestiges selon l’ouvrage. Cette œuvre est également l’un des plus importants documents du patrimoine viatique et historique du Maghreb qui a repris à son compte les différents événements auxquels ont pris part les historiens et les hommes de lettres de son époque, ainsi que leurs ouvrages. L’écrit en question, comporte un nombre important de données historiques et quelques extraits poétiques et littéraires ayant une relation avec le lieu du séjour. Il comprend d'ailleurs des comptes rendus sur les débats et discussions qui ont eu lieu entre l’auteur du livre et d’autres savants algériens, et en particulier, les savants de Tlemcen qu’il avait rencontrés tel que El Cheikh Ibn Dadouche et El Cherif Sidi Mohamed Ben Yousef, le neveu du Juge Abderrahmane Ben Mohamed El Dib El Tlemsani, son gendre Sidi Mohamed Ben Mohamed El Dib et bien d’autres. L’auteur cite, également dans son ouvrage quelques vestiges de la ville tels que les mosquées et les Zaouias.Literature about travels is one of the most fertile fields where Arabs excelled in the past, as the geographical and historical literary works, providing us with valuable information, are witness. Hence the books about journeys are an important source of geographical, historical and social interest, because the author got his information from real life facts and direct observation, which makes a reading useful, pleasant and entertaining. History remembers those pioneers in this field who accomplished this type of journey outside or inside their country. Among the travelers who visited Algeria , in particular the town of Tlemcen, Ahmed Sekerj El Maghribi (1295-1363),the author of Er-Rihla El Habibia who enables us to tackle the account of Tlemcen, its scholars, its leading citizens and its marvels according to the work concerning this journey.The “Er-Rihla El Habibia “book is one of the historical and literary works written by Cheikh Ahmed Ben Skiredj. It is also one of the most important patrimonial and historical documents about provisions for a journey, taking the different events experienced by historians and scholars at that period into account, besides their works. The book in question has an important number of historical data and some poetic and literary extracts relating to the place he found himself. The book also contains accounts of debates and discussions which took place between the author and other Algerian scholars, in particular those of Tlemcen that he met such as El Cheikh Ibn Dadouche and El Cherif Sidi Mohamed Ben Yousef, judge Abderrahmane Ben Mohamed El Dib El Tlemsani’s nephew, his son in law Sidi Mohamed Ben Mohamed El Dib and many others. The author also mentions some town vestiges such as mosques and Zaouiyas.La literatura de viaje se considera como uno de los campos más fecundos en los que los Árabes se han destacado en el pasado, como se ve en las obras de geografía e historia que nos proporcionan informaciones de gran valor. Los autores sacan las informaciones y los hechos a partir de algo vivido y de una observación directa, y hacen que la lectura sea útil, agradable et divertida. La Historia guarda nombres de pioneros en ese campo quienes realizaron ese tipo de viajes dentro o fuera de su país.Entre los viajeros quienes visitaron Argelia, en particular la ciudad de Tlemcen, está Ahmed Sekerj El Maghribi (1295-1363 AH): escribió Er-Rihla El Habibia que va a permitirnos abordar la descripción de la ciudad de Tlemcen, sus sabios, sus notables y algunos de sus vestigios según la obra. Esta última es también uno de los más importantes documentos sobre el patrimonio viático e histórico del Magreb que recoge los diferentes acontecimientos en los que participaron los historiadores y literatos de su época, así que sus obras. El texto en cuestión comporta un número importante de datos históricos y algunos fragmentos poéticos y literarios que tienen que ver con el lugar de estancia; contiene informes sobre debates y discusiones que tuvieron lugar entre el autor del libro y otros sabios argelinos, y en particular, los de Tlemcen que había encontrado como El Cheikh Ibn Dadouche y El Cherif Sidi Mohamed Ben Yousef, sobrino del Juez Abderrahmane Ben Mohamed El Dib El Tlemsani, su yerno Sidi Mohamed Ben Mohamed El Dib y muchos otros. EL autor cita también en su obra algunos vestigios de la ciudad como las mezquitas y las Zaouias
Automorphisms of Algebras and Bochner's Property for Vector Orthogonal Polynomials
No full textWe construct new families of vector orthogonal polynomials that have the property to be eigenfunctions of some differential operator. They are extensions of the Hermite and Laguerre polynomial systems. A third family, whose first member has been found by Y. Ben Cheikh and K. Douak is also constructed. The ideas behind our approach lie in the studies of bispectral operators. We exploit automorphisms of associative algebras which transform elementary vector orthogonal polynomial systems which are eigenfunctions of a differential operator into other systems of this type.This paper is a contribution to the Special Issue on Orthogonal Polynomials, Special Functions and Applications.
The full collection is available at http://www.emis.de/journals/SIGMA/OPSFA2015.html.
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The author is deeply grateful to Boris Shapiro for showing and discussing some examples of
systems of polynomials studied here and in particular the examples from [33]. Without this
probably the project would have never be even started. Also Plamen Iliev made valuable comments
on some results generalizing Laguerre polynomials, which helped me to place my work
among the rest of the research. Milen Yakimov pointed out several errors. Many thanks go to
the referees and the editor who pointed out a number of incorrect formulas and misprints and
thus helped me to improve considerably the initial text. The author is grateful to the Mathematics
Department of Stockholm University for the hospitality in April 2015. Last but not least
I am extremely grateful to Professors T. Tanev and K. Kostadinov, and Mrs. Z. Karova from
the Bulgarian Ministry of Education and Science and Professor P. Dolashka, who helped me in
the dif ficult situation when I was sacked by Sofia university in violations of the Bulgarian laws²
Systematic review of predictive maintenance practices in the manufacturing sector
No full textPredictive maintenance (PDM) is emerging as a strong transformative tool within Industry 4.0, enabling significant improvements in the sustainability and efficiency of manufacturing processes. This in-depth literature review, which follows the PRISMA 2020 framework, examines how PDM is being implemented in several areas of the manufacturing industry, focusing on how it is taking advantage of technological advances such as artificial intelligence (AI) and the Internet of Things (IoT). The presented in-depth evaluation of the technological principles, implementation methods, economic consequences, and operational improvements based on academic and industrial sources and new innovations is performed. According to the studies, integrating CDM can significantly increase machine uptime and reliability while reducing maintenance costs. In addition, the transition to PDM systems that use real-time data to predict faults and plan maintenance more accurately holds out promising prospects. However, there are still gaps in the overall methodologies for measuring the return on investment of PDM implementations, suggesting an essential research direction.The authors are grateful to the Foundation for Science and Tech-
nology (FCT, Portugal) for financial support through national funds
FCT/MCTES (PIDDAC) to CeDRI (UIDB/05757/2020 and UIDP/05757
/2020) and SusTEC (LA/P/0007/2021).
During the preparation of this work the author(s) used [Gramarly/
Quilbolt/chagpt] in order to [improve the language and correct the
sentences and get an adequat analysis and relie information]. After
using this tool/service, the author(s) reviewed and edited the content as
needed and take(s) full responsibility for the content of the publication
Influence of Conservation Agriculture on Durum Wheat Grain, Dough Texture Profile and Pasta Quality in a Mediterranean Region
No full textThere is a growing interest in the Mediterranean regions to switch to conservation agriculture (CA) to address climate change and soil deterioration issues. The novelty of this study lies in the quality of the supply chain, from the raw material (durum wheat grain) to the ready-to-sell product (spaghetti), under long-term CA, and using two varieties over two years of study. This study aims to investigate the impact of two soil management systems (SM) (CA after 10/11 (since 2009–2010) years switching vs. conventional tillage (CT)) on grain quality, dough texture profile, and pasta quality of two Tunisian durum wheat varieties (Karim and Monastir) in a 2-year-long experiment (2019 and 2020). The results showed that the SM had a significant impact on the grain quality in both years in terms of protein content and wet gluten, which were, respectively, lower under CA (11.92% vs. 11.15% for protein content) and (18.75% vs. 17.68% for wet gluten) in the wet year. These parameters increased in the dry year but they were higher under CA (15.70% vs. 14.42 ± 0.94% for protein content) and (26.00% vs. 23.20% for wet gluten). These results have, in turn, affected the dough quality (springiness, chewiness, and cohesiveness) and pasta cooking time and decreased the pasta cooking loss and water absorption index. In terms of the variety (V) factor, “Karim” variety in the dry year had a higher protein content and better dough quality than “Monastir” variety, and it reduced the pasta cooking time. In addition, the pasta yellow index (b*) from grains grown under CA was always higher than those in the CT system (23.99 vs. 19.72% and 25.24 vs. 22.19% in 2019 and 2020, respectively). The interaction between SM and V was significant in both years only for the dough hardness and pasta b* parameters. In conclusion, long-term CA may be a crucial solution in the dry season to promote food quality and achieve sustainable agriculture goals
Focal liver hyperplasia in a patient with Alagille syndrome: Diagnostic difficulties. A case report
No full textAbstractIntroductionAlagille syndrome is a multisystem autosomal disorder. The main clinical features are chronic cholestasis due to paucity of intrahepatic bile ducts, which can progress to cirrhosis and liver failure.Presentation of caseA 15 year-old girl with Alagille syndrome was referred for liver transplantation. She developed severe cirrhosis with refractory ascites. In the pre-transplant evaluation, imaging studies disclosed liver atrophy with a high density pseudotumor in the segment 4, raising the possibility of a hepatocellular carcinoma. However, behavior of the lesion was highly suggestive of focal compensatory hyperplasia surrounded by an atrophic liver. The patient was registered on the waiting list.DiscussionHepatic lesions have been described in Alagille syndrome in isolated case reports, and most of these have been reported to be hepatocellular carcinoma. However, they can be related to an area of focal compensatory hyperplasia in severe cirrhosis. These findings may also explain why progression of liver disease occurs only in 15% of patients.ConclusionThe presence of a large hepatic nodule Alagille syndrome can be benign in these patients also predisposed to hepatocellular carcinoma. Therefore, cautious evaluation with magnetic resonance imaging study before liver transplantation is mandatory
