bluuebunny/crossref_metadata_2025 huggingface dataset:
Clinical Characteristics, Risk Factors, and Population Attributable Fraction for Campylobacteriosis in a Nicaraguan Birth Cohort
Authors: St. Jean Denise T. , Herrera Roberto , Pérez Claudia , Gutiérrez Lester , Vielot Nadja A. , González Fredman , Reyes Yaoska , Toval-Ruiz Christian , Blandón Patricia , Kharabora Oksana , Bowman Natalie M. , Bucardo Filemón , Becker-Dreps Sylvia , Vilchez Samuel
Published: January 2021

Campylobacteriosis is an important contributor to the global burden of acute gastroenteritis (AGE). In Nicaragua, the burden, risk factors, and species diversity for infant campylobacteriosis are unknown. Between June 2017 and December 2018, we enrolled 444 infants from León, Nicaragua, in a population-based birth cohort, conducting weekly household AGE surveillance. First, we described clinical characteristics of symptomatic Campylobacter infections, and then compared clinical characteristics between Campylobacter jejuni/coli and non-jejuni/coli infections. Next, we conducted a nested case–control analysis to examine campylobacteriosis risk factors. Finally, we estimated the population attributable fraction of campylobacteriosis among infants experiencing AGE. Of 296 AGE episodes in the first year of life, Campylobacter was detected in 59 (20%), 39 were C. jejuni/coli, and 20 were non-jejuni/coli species, including the first report of Campylobacter vulpis infection in humans. Acute gastroenteritis symptoms associated with C. jejuni/coli lasted longer than those attributed to other Campylobacter species. In a conditional logistic regression model, chickens in the home (odds ratio [OR]: 3.8, 95% CI: 1.4–9.8), a prior AGE episode (OR: 3.3; 95% CI: 1.4–7.8), and poverty (OR: 0.4; 95% CI: 0.2–0.9) were independently associated with campylobacteriosis. Comparing 90 infants experiencing AGE with 90 healthy controls, 22.4% (95% CI: 11.2–32.1) of AGE episodes in the first year of life could be attributed to Campylobacter infection. Campylobacter infections contribute substantially to infant AGE in León, Nicaragua, with non-jejuni/coli species frequently detected. Reducing contact with poultry in the home and interventions to prevent all-cause AGE may reduce campylobacteriosis in this setting.
Effect of lead treatment on the stipe and leaflet anatomy of Pteris vittata and Pityrogramma calomelanos (Pteridaceae: fern)
Authors: Bamigboye R.A. , Yusuf A.A. , Oloyede F.A.
Published: January 2021

The effect of various concentrations of Lead on stipe and leaflet anatomy of Pteris vittata and Pityrogramma calomelanos were investigated. Fernlets were transplanted into 5 kg pots of soil pre-treated with five different concentrations of Lead, adequately watered and arranged in a complete randomized design in the screen house. Pots with no Lead treatment served as control. At twelve weeks after planting, plants were carefully removed, washed and taken to the laboratory. Anatomical sections of leaflets and stipe of each of the treatments were carried out with a sledge microtome (10-15 μm). Microscopic observations of structures were made after staining the sections. In Pteris vittata, the thickness of the cuticle of the stipe increased with increasing Lead concentrations but the reverse of this was observed in Pityrogamma calomelanos. There was also significant reduction of epidermal and mesophyll cell area of both species with increasing Lead concentrations. It can be concluded from this study that P. vittata has a higher tolerance level to Lead than Pityrogramma calomelanos.

Key words: Anatomy, Cuticle thickness, Ferns, Lead, Pteridaceae.
Bioefficacy of some plants ethanolic extracts against maize weevil (Sitophilus zeamais) infestation of stored maize grains
Authors: Negbenebor H.E. , Nura S.
Published: January 2021

The experiment was conducted to determine the efficacy of three plants ethanolic extracts against maize weevil (Sitophilus zeamais) on stored  maize grains (Zea mays). Five different ethanolic concentrations (0.5 mg/L, 1.0 mg/L, 2.0 mg/L, 4.0 mg/L and 8.0 mg/L) were made from the leaves of Hyptis suaveolens, Alstonia boonei and Tephrosia vogelii with 0.0 mg/L as the control (ethanol) and applied onto the maize grains by dipping. Theexperiment consists of six treatments (including control) and was laid in completely randomized design (CRD) with three replications. Data were collected for adult mortality, number of eggs, larval development and percentage grain damage. The data were subjected to analysis of variance (ANOVA) at 5% probability level with Duncan's Multiple Range Test (DMRT) used to separate the means that were significant. The result obtainedrevealed significant difference (P≤ 0.05) between the concentrations over the control in terms of toxicity, oviposition, induced adult mortality and progeny suppression. However, the extracts from Tephrosia vogelii are the most toxic and produced the best effect with LC of 4.85 mg/L at 24 hours of exposure and 1.94 mg/L at 48 50 hours of exposure. Similar result was found in terms of adult mortality and oviposition suppression. The effectof the extracts is concentration-dependent increase with increase in concentration. The percentage decrease in weight due to the weevil's  infestation was found to be reduced with increase in concentrations. Thus, 8.0 mg/L of the ethanolic extracts of Tephrosia vogelii is recommended for biological control of Sitophilus zeamais against stored maize grains.

Key Words: Concentrations, Ethanolic Extracts, Maize, Weevil.
Evaluation of toxicity and response of African catfish (Clarias gariepinus) exposed to manganese chloride solution
Authors: Awolola T.M. , Areola J.O. , Aladesanmi T.T. , Arayombo B.E.
Published: January 2021

This study investigated the acute toxicity and behavioural response of African catfish (Clarias gariepinus) to manganese chloride (MnCl ) solution.  One hundred (100) pieces of juvenile Clarias gariepinus were acclimatized 2 for 14 days in ten (10) plastic bowls containing 25 L of water each. The acute-toxicity of manganese chloride, LC and sub chronic exposure (28 days) were investigated. For sub-lethal exposure; fifty pieces of C. gariepinus  50 were divided into five groups of ten in bowls labelled (A to E). The fish in groups (A to D) were exposed to manganese chloride solutions at: 68.5, 137, 205.5 and 274 mg/L respectively while group G served as the control. On day 28, the exposed fish were sacrificed; blood, muscle, liver, and gills were collected for haematological and histological studies. The activities of the superoxide dismutase (SOD) and glutathione-Stransferase (GST) were determined using standard methods. The manganese concentrations in the liver, gills and muscle tissues were determined using Atomic Absorption Spectrophotometer (AAS). The LC obtained 50 was 2.74 g/L. The mean water temperature showed that there was no significant variation at (p < 0.05) between the control and other groups. The results of growth parameters showed that fish exposed to 137 mg/L manganese  concentration had better growth performance than those exposed to higher concentrations. The activities of SOD and GST in the liver of fish  increased significantly (p < 0.05) as manganese concentration increases. The red blood cells concentrations decreases while white blood cells  increases as the concentration of manganese increases respectively. The mean bioaccumulation of manganese in the organs of C. gariepinus followed the order of liver > gill > muscle. The histopathological study revealed alterations in the liver, gill and muscle tissues. This study concluded that manganese at concentration greater than 137 mg/L elicits adverse effect on C. gariepinus growth performance, haematology, histopathology as well as liver SOD and GST activities.

Key words: Behavioural response, Cat-fish, Juvenile, Manganese chloride, Toxicity
Antihypertensive effect of Harungana madagascariensis LAM. ex poir. On sodium fluoride-induced hypertension and Associated cardiorenal dysfunctions
Authors: Gbadamosi I.T. , Okolo N.A. , Oyagbemi A.A. , Ajibade T.O. , Omobowale T.O.
Published: January 2021

Hypertension is an important risk factor for cardiovascular diseases, which are major causes of mortality globally. This study evaluated the  antihypertensive effects of Harungana madagascariensis on sodium fluorideinduced hypertension. Twenty-five rats were randomly divided into five groups (A-E). Group A (control), received normal food and water with no treatment; Groups B to E were exposed to 300 ppm sodium fluoride (NaF). In addition, Group C was treated with 10 mg/kg enalapril, while Groups D and E were treated with 100 mg/kg and 200 mg/kg of H. madagascariensis extract, respectively. The result showed that there was a significant decrease in the systolic blood pressure (SBP), diastolic blood pressure (DBP) and mean arterial pressure (MAP) of the rats treated with 200 mg/kg of H. madagascariensis compared with rats exposed to NaF alone. Also significant increase was observed in the activities of the enzymatic and non-enzymatic antioxidants in the cardiac and renal tissues of rats treated with 100 mg/kg and 200 mg/kg of H. madagascariensis extract similar to enalapril, compared with rats exposed to NaF alone. However, serum nitric oxide (NO) decreased significantly in rats exposed to NaF alone compared with rats that received 200 mg/kg H. madagascariensis as treatment. Blood urea nitrogen (BUN) and creatinine increased significantly in rats exposed to NaF alone compared with rats that received 200 mg/kg H. madagascariensis as treatment. The histopathology of the cardiac tissue of the rat exposed to NaF alone showed mild hydropic and vacuolar degeneration of cardiomyocytes, while the renal tissue showed foci of markedly flattened tubular epithelial cells and congestion of interstitial blood vessels. The aforementioned lesions were ameliorated in rats treated with 200 mg/kg H. Madagascariensis. In conclusion, H. madagascariensis had potent antihypertensive effect in rats. The effect was probably mediated via the alleviation of oxidative stress in cardiac and renal tissues.

Key words: Harungana madagascariensis, Antioxidant activity, Oxidative Stress, Hypotensive effect, Sodium fluoride.
Advanced Introduction to Mental Health Law
Authors:   Professor Emeritus of Law, New York Law School, US, Perlin Michael L.
Published: January 2021

Written by esteemed legal scholar Michael L. Perlin, this indispensable Advanced Introduction examines the long-standing but ever-dynamic relationship between law and mental health. The author discusses and contextualises how the law, primarily in the United States but also in other countries, treats mental health, intellectual disabilities, and mental incapacity, giving examples of how issues such as the rights of patients, the death penalty and the insanity defense permeate constitutional, civil, and criminal matters, and indeed the general practice of law.
CO-ADSORPTION CALCULATIONS OF CO AND H2O MOLECULES ON ATOMIC CU CLUSTER DEPOSITED ZNO SURFACE: A DENSITY FUNCTIONAL THEORY STUDY
Authors: THANH CONG VO , DO QUY DIEM , THANH TAM PHAM , THANH KHUE VAN , VAN TAT PHAM
Published: January 2021

Calculations of adsorption and reaction mechanism on ZnO  surface have been investigated. In this work, the deposition of six atomic copper clusters (6Cu) on ZnO  surface (called 6Cu/ZnO  model), using density functional theory was employed to calculate for CO and H2O co-adsorption. In performance, on ZnO  surface, 6Cu were adsorbed to obtain four stable sites of 6Cu/ZnO model, called as 6Cu-I, 6Cu-II, 6Cu-III, and 6Cu-IV. The calculated results found that the 6Cu-IV was the most stable surface model, thus, used to examine the co-adsorption of CO and H2O molecules. Further, CO and H2O co-adsorption on ZnO  surface were calculated also to compare with 6Cu/ZnO surface. Based on co-adsorption energy calculations indicated that CO and H2O co-adsorption on 6Cu/ZnO surface were more favorable than on ZnO  surface. The studied results will provide an insight into the effective adsorption of cluster on ZnO-based surface by deposition.
THE LENGTHS OF SPEED-CHANGE LANES OF HIGHWAY
Authors: SƠN HÀ NGUYỄN TRỌNG
Published: January 2021

In order to achieve the purpose of speed with the design, comfort and safety for people and vehicles when joining in and out of expressways, the technical standards not only pay attention for the highway on the planes and vertical tracking, but also pay attention to the speed-change lane. Content of the article refers to the method of calculating the total length of the speed change lane in accordance with Vietnam Standard TCVN 5729: 2012 – High-way designed requirements, comparison with TCVN 4054 : Roadways - designed requirements. This makes conclusions for the future design of high-ways and roads improvements and upgrades.
A STUDY ON BEHAVIOR OF TUNNEL IN SOFT SOIL CONDITIONS UNDER INFLUENCE OF EARTHQUAKES IN HO CHI MINH CITY
Authors: DUNG NGUYEN QUANG , QUOC LE BAO , TAM NGUYEN DUC
Published: January 2021

Due to economic development and traffic congestion constraints, HCM City has implemented urban railways since 2007 and is currently constructing the underground metro line No 01. So far, general constructions and tunnel in particular in Vietnam is a complex issue, especially in the specific soft soil conditions of Ho Chi Minh City. In order to study the behavior of the tunnel during the earthquake, this paper compares an Imposed Seismic Ground Deformation method (ISGD) and the acceleration diagram method in calculating the tunnel affected by the earthquake in soft soil of the area of Ho Chi Minh city.
NGHIÊN CỨU HIỆN TRẠNG Ô NHIỄM VÀ ĐỀ XUẤT CÁC GIẢI PHÁP BẢO VỆ CHẤT LƯỢNG NƯỚC MẶT TRÊN ĐỊA BÀN HUYỆN XUÂN LỘC, TỈNH ĐỒNG NAI
Authors: THẮNG LÊ VIỆT , KHÁNH NÔNG VĂN
Published: January 2021

Huyện Xuân Lộc, Đồng Nai có vai trò quan trọng trong quá trình xây dựng phát triển kinh tế xã hội của địa phương, những năm gần đây tốc độ phát triển kinh tế được đẩy nhanh, đi đôi với quá trình phát triển sẽ nảy sinh những tác động tiêu cực, làm ảnh hưởng tới tài nguyên và môi trường tại khu vực. Việc nghiên cứu hiện trạng ô nhiễm, xác định các nguồn gây ô nhiễm, từ đó đề xuất các giải pháp nhằm ngăn ngừa, hạn chế tác động xấu đến nguồn nước mặt huyện Xuân Lộc, Đồng Nai là cần thiết và cấp bách. Dựa trên phương pháp đo đạc, lấy mẫu phân tích hiện trạng môi trường, tính toán chỉ số chất lượng nước, thu thập thông tin từ phiếu điều tra, tính toán tải lượng ô nhiễm các nguồn thải: chăn nuôi heo, cơ sở sản xuất,...Kết quả nghiên cứu cho thấy: Chất lượng nước mặt của huyện Xuân Lộc có dấu hiệu ô nhiễm về hàm lượng chất hữu cơ (BOD5, COD), chất dinh dưỡng (Nitrit, Nitrat, Amôni, Phosphat) và vi sinh (Coliform). Vào mùa khô các thông số ô nhiễm cao hơn so với mùa mưa. Hoạt động chăn nuôi heo là nguồn phát sinh lưu lượng và tải lượng ô nhiễm nhiều nhất và gấp nhiều lần so với các nguồn thải khác. Từ kết quả điều tra, phân tích, bài nghiên cứu đã đưa ra các giải pháp thiết thực nhằm giảm thiểu, ngăn ngừa, hạn chế tác động xấu đối với môi trường nước mặt tại khu vực Xuân Lộc, Đồng Nai.
CHI TIÊU CHÍNH PHỦ VÀ TĂNG TRƯỞNG KINH TẾ TẠI MỘT SỐ QUỐC GIA ĐÔNG NAM Á
Authors: LINH NGUYỄN THỊ MỸ
Published: January 2021

Bài nghiên cứu tập trung kiểm định sự tác động của chi tiêu chính phủ đến tăng trưởng kinh tế tại 05 quốc gia khu vực Đông Nam Á (ASEAN) gồm: Việt Nam, Thái Lan, Phillippine, Indonesia, Malaysia trong giai đoạn 2000-2016. Nghiên cứu sử dụng phương pháp định lượng hồi quy với dữ liệu bảng, cụ thể là phương pháp GMM (Generalized Method of Moment) nhằm khắc phục hiện tượng tự tương quan giữa các sai số, hiện tượng phương sai của sai số thay đổi và các vấn đề nội sinh tiềm ẩn. Kết quả nghiên cứu cho thấy chi tiêu chính phủ có tác động phi tuyến đến tốc độ tăng trưởng kinh tế tại các quốc gia nghiên cứu, cụ thể mức chi tiêu chính phủ tối ưu cho tăng trưởng kinh tế là 23,23% GDP. Đây là cơ sở để tác giả đưa ra một số gợi ý chính sách cho các nhà quản lý Việt Nam nhằm góp phần phát huy tác động tích cực của chi tiêu chính phủ đến tăng trưởng kinh tế.
THE IMPACT OF ADVERTISING VALUE TO AWARENESS AND BEHAVIOR OF ADVERTISING AVOIDANCE – A STUDY ON FACEBOOK ADVERTISING IN HO CHI MINH CITY
Authors: VI HỒ TRÚC , NHÂN PHAN TRỌNG
Published: January 2021

This research aims to discover and confirm the factors that affect awareness and behaviors that avoid advertising in the Facebook social networking environment. Data were collected from 250 clients living and working in Ho Chi Minh City. The research model and scales were constructed from the theoretical bases of advertising avoidance by R. H. Ducoffe [8], L. K. Bracket và B.N. Carr [2], C.H. Cho và H. J. Cheon [3], D. J. Xu [20], K. Louiseet al. [15], S. M. Choi et al. [4] as well as from the preliminary interview results. Based on that, the author has developed an evasion scale in terms of cognitive behavior under the influence of advertising value with three dimensions of value: information, entertainment and incentive. The model is implemented with SEM linear analytical method. Research results show that both values of information and entertainment value affect avoidance awareness and avoidance behaviors. In the scale of information value has the most impact on perception, the scale of entertainment has the strongest impact on behavior. The incentive value scale only affects the behavior of advertising avoidance.
Online Brand Communities: The Difference between Lurkers, Infrequent Posters, & Frequent Posters
Authors: McLaughlin Caitlin
Published: January 2021

Brand managers are very interested in getting brand communities right because they lead to many positive outcomes, such as increased brand loyalty, purchase intentions, positive word-of-mouth, and many others. The current module discusses the various types of brand community members. Historically, brand community members have been divided into two types. However, recent research indicates that there are, indeed, three different types of members: lurkers, infrequent posters, and frequent posters. These three types of members are discussed regarding their definition, their motivation when joining these brand communities, and why understanding these differences is important to brand managers.
Reconstruction of missing boundary conditions from partially overspecified data : the Stokes system
Authors: Ben Abda Amel , Khayat Faten
Published: January 2021

We are interested in this paper with the ill-posed Cauchy-Stokes problem. We consider a data completion problem in which we aim recovering lacking data on some part of a domain boundary , from the knowledge of partially overspecified data on the other part. The inverse problem is formulated as an optimization one using an energy-like misfit functional. We give the first order opti-mality condition in terms of an interfacial operator. Displayed numerical results highlight its accuracy.

Nous nous intéressons à un problème de Cauchy mal posé, celui de la complétion de données frontières pour les équations de Stokes. Nous voulons reconstituer les données manquantes sur une partie non accessible de la frontière du domaine à partir de données peu surdéterminées sur la partie accessible. Nous formulons ce problème inverse sous forme de minimisation d'une fonctionnelle de type énergie. Les conditions d'optimalité du premier ordre sont écrites en termes d'équation d'interface utilisant les opérateurs de Stecklov-Poincaré. Nous donnons des résultats numériques attestant l'efficacité de la méthode.
Analysis of Texture Applied to Renal Echography
Authors: Tahiri Alaoui M. , Farssi S.M. , Touzani K. , Bunel P.
Published: January 2021

Renal echography remains the least expensive means for the exploration of the kidney. The system that we propose is a contribution for the diagnostic automatic of the kidney on ultrasound image. The analysis of texture is a technique which proved reliable in the field of the characterization of the human organs on ultrasound images. Indeed, our contribution aims at the characterization of the images of echographic textures of the kidney. This characterization is, in a first level, structural to evaluate the presence (form and position) of the various components of the kidney (clusters, medullary cortical zone). The statistical analysis of texture constitutes our second approach by carrying out virtual punctures on the kidney in order to be able to evaluate its state by quantifying the texture of the various areas characteristic of the kidney .

L'échographie rénale reste le moyen le moins coûteux pour l'exploration du rein. Le système que nous proposons est une contribution à l'amélioration du diagnostic automatique du rein par l'analyse de texture, une technique qui a fait ses preuves dans le domaine de la caractérisation des organes humains sur des images ultrasoniques. Dans un premier temps, la caractérisation structurelle des images de texture échographique du rein permettra de visualiser (forme et position) les différentes composantes du rein (glomérules, médullaire, zone corticale). Elle sera complétée par l'analyse statistique de texture qui consistera à réaliser des ponctions virtuelles sur le rein pour en évaluer l'état général en quantifiant la texture des différentes régions caractéristiques
Régularisation de l'équation de Galbrun pour l'aéroacoustique en régime transitoire
Authors: Bonnet-Bendhia Anne Sophie , Berriri Kamel , Joly Patrick
Published: January 2021

In this paper we are interested in the mathematical and numerical analysis of the timedependent Galbrun equation in a rigid duct. This equation modelizes the acoustic propagation in presence of flow. We prove the well-posedness of the problem for a subsonic uniform flow. Besides, we propose a regularized variational formulation of the problem suitable for an approximation by Lagrange finite elements.

Dans ce papier, nous nous intéressons à l'analyse mathématique et à l'approximation numérique de l'équation de Galbrun en régime transitoire dans un conduit rigide. Cette équation modélise la propagation d'ondes acoustiques en présence d écoulement. Nous montrons pour un écoulement porteur uniforme subsonique que ce modèle a une solution unique. En outre, nous proposons une formulation variationnelle régularisée qui se prête à une approximation par éléments finis de Lagrange.
Un modèle Darcy-Forchheimer pour un écoulement dans un milieu poreux fracturé
Authors: Frih Najla , Roberts Jean E. , Saada Ali
Published: January 2021

We propose a numerical model for the flow of a single phase,incompressible fluid in a porous medium with fractures. In this model, the flow obeys Forchheimer's law in the fracture and Darcy's law in the rock matrix.

Nous proposons un modèle numérique d'un écoulement monophasique d'un fluide incompressible dans un milieu poreux fracturé. Les lois d'écoulement sont celle de Forchheimer dans la fracture et de Darcy dans la matrice rocheuse.
An Algorithm for the Navier-Stokes Problem
Authors: Nouri F.Z. , Amoura K.
Published: January 2021

This study is a continuation of the one done in [7],[8] and [9] which are based on the work, first derived by Glowinski et al. in [3] and [4] and also Bernardi et al. [1] and [2]. Here, we propose an Algorithm to solve a nonlinear problem rising from fluid mechanics. In [7], we have studied Stokes problem by adapting Glowinski technique. This technique is userful as it decouples the pressure from the velocity during the resolution of the Stokes problem. In this paper, we extend our study to show that this technique can be used in solving a nonlinear problem such as the Navier Stokes equations. Numerical experiments confirm the interest of this discretisation.

Cette étude est la continuation des travaux [7],[8] et [9] qui sont basés sur l'étude faite par Glowinski et al. [3] et [4] ainsi que Bernardi et al. (voir [1] et [2]). Ici nous proposons un Algorithme pour résoudre un problème non-linéaire issu de la mécanique des fluides. Dans [7] nous avons étudié le problème de Stokes en adaptant la technique de Glowinski, grace à aquelle, on peut découpler la pression de la vitesse lors de la résolution du problème de Stokes. Dans ce travail, nous étendons notre étude et montrons que cette technique peut être utilisée dans la résolution d'un probème non-linéaire comme les quations de Navier Stokes. Des tests numériques confirment l'intérêt de la discrétisation.
Hermite spline interpolents ― New methods for constructing and compressing Hermite interpolants
Authors: Mraoui Hamid , Sbibih Driss
Published: January 2021

In this paper, we present a quite simple recursive method for the construction of classical tensor product Hermite spline interpolant of a function defined on a rectangular domain. We show that this function can be written under a recursive form and a sum of particular splines that have interesting properties. As application of this method, we give an algorithm which allows to compress Hermite data. In order to illustrate our results, some numerical examples are presented.

Dans ce travail, nous présentons une méthode simple permettant de construire le produit tensoriel des interpolants splines d'Hermite d'une fonction définie sur un domaine rectangulaire. Nous montrons que cette fonction peut être décrite de manière récursive sous la forme d'une somme de fonctions splines qui vérifiant des propriétés intéressantes. Comme application de cette décomposition, nous décrivons un algorithme qui permet de compresser des données d'Hermite. Pour illustrer nos résultats théoriques, nous donnons quelques exemples numériques.
Interoperability test generation: formal definitions and algorithm
Authors: Desmoulin Alexandra , Viho César
Published: January 2021

In the context of network protocols, interoperability testing is used to verify that two (or more) implementations communicate correctly while providing the services described in their respective specifications. This study is aimed at providing a method for interoperability test generation based on formal definitions. Contrary to previous works, this study takes into account quiescence of implementations that may occur during interoperability testing. This is done through the notion of interoperability criteria that give formal definitions of the different existing pragmatic interoperability notions. It is first proved that quiescence management improves non-interoperability detection. Two of these interoperability criteria are proved equivalent leading to a new method for interoperability test generation. This method avoids the well-known state explosion problem that may occur when using existing classical approaches.

Dans le contexte des protocoles réseaux, le test d'interopérabilité est utilisé pour vérifier si deux (ou plus) implémentations communiquent correctement tout en fournissant les services décrits dans les spécifications correspondantes. Le but de cet article est de fournir une méthode pour la génération de tests d'interopérabilité basée sur une définition formelle de la notion d'interopérabilité. Contrairement aux travaux précédents, cette étude prend en compte les blocages des implémentations qui peuvent être observés durant un test d'interopérabilité. Ceci est réalisé via la notion de critères d'interopérabilité, qui donnent des définitions formelles des notions d'interopérabilité existantes. Il est tout d'abord prouvé que la gestion des blocages améliore la détection de la non-interopérabilité. L'équivalence de deux des critères est aussi prouvée permettant l'introduction d'une nouvelle méthode de génération de tests d'interopérabilité. Cette méthode permet d'éviter le problème d'explosion combinatoire du nombre d'états que rencontrent les approches classiques.
Complexity in a prey-predator model
Authors: Camara Baba I. , Alaoui Moulay A. Aziz
Published: January 2021

In this paper we consider a predator-prey model given by a reaction-diffusion system. It incorporates the Holling-type-II and a modified Leslie-Gower functional response. We focus on qualitaive analysis, bifurcation mecanisms and patterns formation.

Nous considérons un modèle proie-prédateur exprimé sous forme de système de réaction diffusion. En absence de diffusion, le système étudié est de type Holling-type-II et la réponse fonctionnelle une forme modifiée du terme de Leslie-Gower. Dans cet article, nous nous intéressons à l’analyse qualitative des solutions , l’étude des bifurcations et la formation de motifs spatio-temporels.
Nearly recombining processes and the calculation of expectations
Authors: Van den Berg Imme , Amaro Elsa
Published: January 2021

In the context of Nonstandard Analysis, we study stochastic difference equations with infinitesimal time-steps. In particular we give a necessary and sufficient condition for a solution to be nearly-equivalent to a recombining stochastic process. The characterization is based upon a partial differential equation involving the trend and the conditional variance of the original process. An analogy with Ito’s Lemma is pointed out. As an application we obtain a method for approximation of expectations, in terms of two ordinary differential equations, also involving the trend and the conditional variance of the original process, and of Gaussian integrals.

Dans le contexte de l’Analyse Nonstandard, nous étudions des équations différentielles stochastiques avec des pas infiniment petits. En particulier, nous formulons une condition nécessaire et suffisante pourqu’une solution soit presque-équivalente à un processus stochastique recombinant. La caractérisation est donnée par une équation aux dérivées partielles de la tendance et de la variance conditionnelle du processus de départ. Nous indiquons une analogie avec le Lemme d’Ito. Nous appliquons cette caractérisation au problème de la détermination d’espérances pour le processus de départ. En fait, on obtient une approximation infinitésimale en resolvant deux équations différentielles ordinaires, également de la tendance et de la variance conditionnelle de ce processus, et en calculant une intégrale de Gauss.
The peaking phenomenon and singular perturbations
Authors: Lobry Claude , Sari Tewfik
Published: January 2021

We study the asymptotic behaviour, when the parameter " tends to 0, of a class of singularly perturbed triangular systems x˙ = f(x, y), y˙ = G(y, "). We assume that all solutions of the second equation tend to zero arbitrarily fast when " tends to 0. We assume that the origin of equation x˙ = f(x, 0) is globally asymptotically stable. Some states of the second equation may peak to very large values, before they rapidly decay to zero. Such peaking states can destabilize the first equation. The paper introduces the concept of instantaneous stability, to measure the fast decay to zero of the solutions of the second equation, and the concept of uniform infinitesimal boundedness to measure the effects of peaking on the first equation. Whe show that all the solutions of the triangular system tend to zero when " ! 0 and t ! +1. Our results are formulated in both classical mathematics and nonstandard analysis.

On étudie le comportement asymptotique, lorsque le paramètre " tend vers 0, de systèmes triangulaires singulièrement perturbés de la forme x˙ = f(x, y), y˙ = G(y, "). On suppose que toutes les solutions de la deuxième équation tendent vers zéro arbitrairement rapidement quand " tend vers 0. On suppose que le système x˙ = f(x, 0) admet l’origine comme équilibre globalement asymptotiquement stable. Certaines solutions de la deuxième équation peuvent présenter un transitoire avec un pic très grand avant de décroître rapidement vers zéro. C’est ce phénomène de peaking qui peut déstabiliser la première équation. On introduit le concept de stabilité instantanée, pour mesurer la décroissance rapide vers zéro des solutions de la deuxième équation, et le concept de système uniformément infinitésimalement borné pour mesurer les effets du peaking sur la première équation. On montre que les solutions du système triangulaire tendent vers zéro quand " ! 0 et t ! +1. Nos résultats sont formulés dans le cadre de l’analyse non standard et sont traduits en termes classiques.
Simulation du remplissage des moules par la méthode des éléments Finis / volume contrôle dans les procédés RTM
Authors: Samir J. , Hattabi M. , Echaabi J. , Saouab A. , Park C.H.
Published: January 2021

In the course of this study, the simulation of the resin flow in the RTM process is developed by the control volume finite element method (CVFEM) coupled with the equation of the free surface location. This location is made by means of the so called "Volume of Fluid" methods or VOF. Thus, the position of the flow front, the time-lapse and the rate of the non saturated zone are calculated at every step. Our results will be compared with the experimental and analytical models in the literature. On the whole, our study is concerned with the simulation of the thermally insulated filling of moulds in RTM process while adopting the CVFEM and VOF method, taking into account the presence of obstacles, coupled with the thickness variation effect and the reinforcement coats.

La présente étude porte sur la simulation du remplissage isotherme des moules en procédé RTM, en adoptant la méthode CV/FEM et VOF, avec prise en compte de la présence d’obstacles couplée à l’effet de la variation de l’épaisseur et des couches du renfort. Les codes développés ont pour objectif d’optimiser le positionnement des points d’injection, des évents et déterminer les pressions d’injection optimales pour minimiser les temps de cycle. Ces codes utilisent un mailleur propre à l’équipe permettant de discrétiser le domaine en éléments triangulaires non structurés avec possibilité de raffinement local et d’inclusion d’inserts.
Two Short Presentations related to Cancer Modeling
Authors: Habbal A. , Jabin P.-E.
Published: January 2021

This paper contains two short presentations related to the mathematical modeling of Cancer. The first part intends to introduce a tumour-immune system interaction, which describes the early dynamics of cancerous cells, competing with the immune system, potentially leading to either the elimination of tumoral cells or to the viability of a solid tumor. The second part of the paper addresses the case where a solid tumor has grown enough to initiate angiogenesis, a process which equips the tumor with its own blood network. Nash game theory is used to model the interaction between activators and inhibitors of the angiogenesis process.
Vers une métrique de description objective d'une sensation subjective
Authors: Ouni Sonia , Zagrouba Ezzeddine , Chambah Majeb , Herbin Michel
Published: January 2021

In the last decade, several image and video quality metrics have been proposed, which incorporate perceptual quality measures by considering the HVS characteristics. All this metrics do the differences pixel to pixel in image. Therefore a local fidelity of the colour is defined. However, the human visual system is rather sensitive to a global quality. In this paper, we propose a new objective full reference quality metric for colour images called Global Delta E and noted: ~ G DE . This metric is based on human visual system properties in order to obtain the best correspondence with judgments. Some experimentations and assessments prove the performance of our metrics and that interrelationship with the SVH.

L'étude du système visuel Humain (SVH) est primordiale pour quantifier la qualité d'une image. Plusieurs travaux ont proposé des métriques de différences de couleurs qui effectuent des différences locales pixel par pixel. Par contre, le système visuel humain est plutôt sensible à une qualité globale. Dans cet article, nous proposons une nouvelle métrique objective de différence couleur basée sur les caractéristiques du système visuel humain. La métrique proposé est appelée Delta E Globale notée : ~ DEG . Quelques expérimentations et évaluations montrent la performance de cette métrique et sa corrélation avec la vision du SVH.
Typing rules OCL specification of QoS-capable ODP Computational Interfaces
Authors: Reda Oussama , EL OUAHIDI Bouabid , BOURGET Daniel
Published: January 2021

In this work we model the interaction signature concepts in a consistent and compact manner as well as their related type checking rules. First, we begin by literally analyzing those concepts in order to bring unambiguous definitions out of them. Following this analysis we shall formalize those concepts by mapping them into UML language constructs. Secondly, we specify constraints imposed on computational interfaces interaction signatures related to the computational language typing and subtyping rules. We shall show how we can we literally redefine those rules in order to steadily formalize them. After rewriting those rules in a compact way, we make use of OCL 2.0 which provides the means to exploit those new definitions. Then we introduce the concept of Functional computational interface and a set of related concepts which unify signal and operation interfaces notions. Based on the new additional concepts introduced, we introduce two new important concepts, namely; QoS-definable interactions and QoS-capable interfaces. We then provide a UML metamodel of interfaces and interaction signatures. The final metamodel being a first step towards a QoS-capable computational metamodel. Finally, as an application of our modeling choices we define ODP QoScapable computational interfaces type checking rules and then specify them using OCL 2.0

Dans ce travail, nous analysons le concept ODP de signatures d’interfaces de traitement et leurs règles de typages, le but étant de redéfinir les signatures de manière concise et compacte. Pour cela, nous modélisons les signatures par des concepts UML équivalents. Ensuite, nous spécifieons des contraintes imposées sur ces signatures d’interfaces de traitement ODP liées aux règles de typages et sous-typages. Nous allons montrer également comment nous pouvons littéralement redéfinir ces règles afin de mieux les formaliser en utilisant OCL 2.0. Par la suite nous introduisons trois nouveaux concepts qui sont: functional computational interfaces, QoS-definable interactions and QoS-capable interfaces. Finalement, nous définissons les règles typologiques relatives aux QoS-capable interfaces et les spécifions en OCL 2.0
Les Composants Logiciels et La Séparation Avancée des Préoccupations : Vers une nouvelle Approche de Combinaison
Authors: Hariati Mehdi , Meslati Djamel
Published: January 2021

The component based approach and advanced separation of concerns are two important paradigms for software systems development. Although the two paradigms are complementary and looking for their synergy is a promising issue, only few research works are currently dedicated to their combination. This paper presents a comparative state of the art of the main research works that aim at the synergy of the two paradigms and proposes a new approach of combination that derives from the fact that all potential contributions that can be drawn, are tightly related with the well manipulation of aspects.

L’approche basée composant et la séparation avancée des préoccupations constituent deux paradigmes importants pour le développement des systèmes logiciels. Bien que les deux paradigmes soient complémentaires et que la recherche de leur synergie soit une issue prometteuse, relativement peu de travaux sont actuellement dédiés à leur combinaison. Cet article présente un état de l’art comparatif des principaux travaux qui ciblent la synergie des deux paradigmes et propose une nouvelle approche de combinaison qui part du constat que tous les apports potentiels pouvant être tirés de cette combinaison sont étroitement liés à la bonne manipulation des aspects
Modélisation asymptotique d’une coque peu-profonde de Marguerre-von Kármán généralisée dans le cas dynamique
Authors: Chacha D.A. , Ghezal A. , Bensayah A.
Published: January 2021

In a recent work Gratie has generalized the classical Marguerre-von Kármán equations studied by Ciarlet and Paumier in [2], where only a portion of the lateral face is subjected to boundary conditions of von Kármán’s type and the remaining portion being free. She shows that the leading term of the asymptotic expansion is characterized by a two-dimensional boundary value problem. In this paper, we extend formally this study to dynamic case.

Dans un travail récent Gratie [7] a généralisé les équations de Marguerre-von Kármán classiques étudiées par Ciarlet et Paumier dans [2], où une partie seulement de la face latérale est soumise à des conditions aux limites de type von Kármán et la partie restante étant libre. Elle montre que le terme dominant du développement asymptotique est caractérisé par un problème aux limites bi-dimensionnel. Dans ce travail, on étend formellement cette étude au cas dynamique
A survey of RDF storage approaches
Authors: Faye David C. , Curé Olivier , Blin Guillaume
Published: January 2021

The Semantic Web extends the principles of the Web by allowing computers to understand and easily explore the Web. In recent years RDF has been a widespread data format for the Semantic Web. There is a real need to efficiently store and retrieve RDF data as the number and scale of Semantic Web in real-word applications in use increase. As datasets grow larger and more datasets are linked together, scalability becomes more important. Efficient data storage and query processing that can scale to large amounts of possibly schema-less data has become an important research topic. This paper gives an overview of the features of techniques for storing \textttRDF data.

Le Sémantique étend les principes du Web en permettant aux ordinateurs de comprendre et d'explorer le Web de façon intelligente. Ces dernières années, RDF s'est largement répandu comme format de données du Web Sémantique. Il y a un réel besoin de stocker et de rechercher de façon efficiente les données RDF vu que le nombre et la taille des données du Web Sémantique utilisées dans les applications du monde réél est en progression continue. Etant donné que les sources de données sont de plus en plus volumineuses et de plus en plus liées, le passage à l'échelle devient plus que necessaire. Le stockage efficace de données et le traitement de requête à l'échelle de grande sources de données souvent sans schémas est devenu un sujet de recherche très important. Cet article présente les caractéristiques des différentes propositions pour le stockage de données RDF.
Minimization of an energy error functional to solve a Cauchy problem arising in plasma physics: the reconstruction of the magnetic flux in the vacuum surrounding the plasma in a Tokamak
Authors: Faugeras Blaise , Ben Abda Amel , Blum Jacques , Boulbe Cedric
Published: January 2021

A numerical method for the computation of the magnetic flux in the vacuum surrounding the plasma in a Tokamak is investigated. It is based on the formulation of a Cauchy problem which is solved through the minimization of an energy error functional. Several numerical experiments are conducted which show the efficiency of the method.
Comportement asymptotique d’un modèle à commutation de la prolifération du Typha
Authors: Diagne Mamadou Lamine , Ndiaye Papa Ibrahima , Niane Mary Teuw , Sari Tewfik
Published: January 2021

In this paper we propose a mathematical model of the Typha growth and analyse its stability. The model that we plan to study describes the dynamics of the plant population. The theoretical study of this model determines the key factors of the Typha proliferation. We present the analysis of equilibrium solutions and lead a study of their local stability.This constitutes a first step towards a more detailed study of the nonlinear dynamics of this model.
Approche de sélection d’attributs pour la classification basée sur l’algorithme RFE-SVM
Authors: Slimani Yahya , Essegir Mohamed Amir , Samb Mouhamadou Lamine , Camara Fodé , Ndiaye Samba
Published: January 2021

The feature selection for classification is a very active research field in data mining and optimization. Its combinatorial nature requires the development of specific techniques (such as filters, wrappers, genetic algorithms, and so on) or hybrid approaches combining several optimization methods. In this context, the support vector machine recursive feature elimination (SVM-RFE), is distinguished as one of the most effective methods. However, the RFE-SVM algorithm is a greedy method that only hopes to find the best possible combination for classification. To overcome this limitation, we propose an alternative approach with the aim to combine the RFE-SVM algorithm with local search operators based on operational research and artificial intelligence.
An arbitrary high order discontinuous Galerkin scheme for the elastodynamic equations
Authors: Mpong Serge Moto
Published: January 2021

We present in this paper the formulation of a non-dissipative arbitrary high order time domain scheme for the elastodynamic equations. Our approach combines the use of an arbitrary high order discontinuous Galerkin interpolation with centred flux in space, with an arbitrary high order leapfrog scheme in time. Numerical two dimensionnal results are presented for the schemes from order two to order four. In these simulations, we discuss of the numerical stability and the numerical convergence of the schemes on the homogeneous eigenmode problem. We also show the ability of the computed schemes to carry out more complex propagation probems by simulating the Garvin test with an explosive source. The results show the high accuracy of the method, both on triangular regular and irregular meshes.

Nous présentons dans ce papier une méthode Galerkin discontinu d’ordre arbitrairementélevé pour les équations de l’élastodynamique en domaine temporel. Notre approche combine uneinterpolation spatiale d’ordre arbitraire, des flux centrés ainsi qu’un schéma saute-mouton d’ordrearbitrairement élevé pour l’intégration temporelle. Des résultats numériques de la propagation d’unmode propre 2D sont présentés dans le cas des schémas saute-mouton d’ordre 2 et 4. Une étudenumérique de la stabilité et de la convergence de la méthode est également proposée, ainsi qu’uneapplication du schéma à la résolution d’un problème de propagation plus complexe: le test de Garvin.Ces différentes simulations montrent que le schéma développé est très précis, aussi bien sur desmaillages réguliers que non réguliers.
Réseaux bayésiens jumelés et noyau de Fisher pondéré pour la classification de documents XML
Authors: Yassine Ait Ali Yahia , Karima Amrouche
Published: January 2021

In this paper, we are presenting a learning model for XML document classification based on Bayesian networks. Then, we are proposing a model which simplifies the arborescent representation of the XML document that we have, named coupled model and we will see that this approach improves the response time and keeps the same performances of the classification. Then, we will study an extension of this generative model to the discriminating model thanks to the formalism of the Fisher’s kernel. At last, we have applied a ponderation of the structure components of the Fisher’s vector. We finish by presenting the obtained results on the XML collection by using the CBS and SVM methods
Commande optimale en temps minimal d'un procédé biologique d'épuration de l'eau
Authors: Bouafs Walid , Abdellatif Nahla , Jean Frédéric , Jérôme Harmand
Published: January 2021

In this work, we consider an optimal control problem of a biological sequencing batch reactor for the treatment of pollutants. This model includes two biological reactions, one being aerobic while the other is anoxic. We are first interested in a problem of optimal control in time and then, in both time and energy. The existence of the optimal trajectories is proven and the corresponding optimal controls are derived in each case.