Behavior of Recycled Asphalt to the Fatigue

Climatic and traffic effects are the causes of aging of the surface layer of asphalt, which leads to the necessary renovation of the latter. The use of waste from the tread layer provides a viable and beneficial solution for the environment and the economy. However, this solution must meet the requirement of sustainable development, which necessitates that a road has a very long lifespan. In this study we investigated the performance of recycled asphalt in terms of fatigue (as an element of life-cycle control). All the formulas were tested by the fatigue test in order to define the influence of the proportions of the asphalt aggregates, penetrability of the new binder used, and the manufacturing temperature. The results obtained showed the relationship between the contribution binder (reproduced between the new binder and the old binder) and the fatigue resistance under the influence of the parameters that we have mentioned above. At the end an optimization study has been carried in order to determine exactly the doses required to formulate recycled asphalt resisted to fatigue, the optimization seeks to maximize the asphalt aggregates and minimized the temperature of manufacture with a class of the binder compatible

An Improved Model for Breast Cancer Diagnosis by Combining PCA and Logistic Regression Techniques

Abstract: Breast cancer is weighed one of the most life-threatening illnesses confronting women. It happens when the multiplication of cells in breast tissue is uncontrollable. Several studies have been performed in the healthcare field for early breast cancer diagnosis. However, traditional methods can generate incomplete or misleading outcomes. To overcome these limitations, computer-aided diagnosis (CAD) systems are extensively exploited in the healthcare domain. It is designed to improve accuracy, decrease complexity, and reduce misclassification costs. The goal of this study is to present a breast cancer CAD system based on combining the Principal Component Analysis (PCA) method for feature reduction and Logistic Regression (LR) for BC tumors classification. The experiments have been conducted on Wisconsin Diagnosis Breast Cancer (WDBC) and Wisconsin Original Breast Cancer (WOBC) datasets from UCI repository using different training and testing subsets. Moreover, we carried out extensive comparisons of our approach with other existing approaches. Multiple metrics like precision, F1 score, recall, accuracy, and Area Under Curve (AUC) were used in this study. Experimental results indicate that the proposed approach records a remarkable performance rate with an accuracy of 1.00 and 0.98 for WDBC and WOBC respectively and outperforms the previous works by decreasing the number of features, improving the data quality, and reducing the response time.16 página

Contribution of the Blast Furnace Slag on the Behavior of HPC in a Hydrochloric Environment

Most mechanical properties and durability of cementitious materials are related to the performance of the hydrated cement that coats the granular skeleton. However, different mineral additions are currently used in concrete. They are used as addition or substitution to cement. The use of these supplementary cementitious materials provides to concrete a denser matrix that will be more resistant to aggressive environments such as sulphates, chlorides and other aggressive agents. In mixtures containing finely ground of slag, 15% of cement by weight was replaced with finely ground of slag of El-Hadjar (Algeria). The main objective of this study is to investigate the effect of curing in the hydrochloric environment by subjugating its granular effect on the performance of concrete. Density, compressive strength, concrete surface, internal microstructure and ultrasonic pulse velocity were investigated in this research. The damage mechanisms of concrete have been related to the development of the microstructure of the material. The degradations were observed using a scanning electron microscope (SEM) and quantified by x-ray diffraction (XRD). The microstructural study concerns both the surface layer and the internal structure of the samples. The results have shown that slag of El-Hadjar present a pozzolanic activity and hence it affects favorably the microstructure of the paste which becomes denser and less permeable

Identification of the causes of onion (Allium cepa) post-harvest losses in Morocco

L’oignon figure parmi les principales cultures maraîchères au Maroc. Cependant, plusieurs types de pertes peuvent avoir lieu après leur récolte. Notre objectif est d’étudier la situation de cette filière en post récolte et d’identifier les causes et les contraintes rencontrées au cours de la mise en vente et de la consommation de ce produit dans la région de Khémisset (Maroc). L’enquête auprès de certains acteurs de cette filière nous a permis de déterminer les types et l’ampleur des pertes. Les dégâts observés sont causés principalement par des facteurs mécaniques et pathologiques. Nous avons identifié deux champignons phytopathogènes, Fusarium sp. et Aspergilus niger. En outre, l’étude a révélé des pertes moyennes d’environ 17% chez les grossistes, 15 % chez les commerçants et 27% chez les ménages. Mots-clés: Pertes en post-récolte, oignon, champignons phytopathogènesOnion is one of the main commodities in Morocco. However, several types of losses may occur at postharvest. Our objective is to study the situation of this post-harvest sector and to identify the causes and constraints encountered during the sale and consumption of this product in Khémisset region (Morocco). The survey of certain stakeholders allowed us to determine the types and extent of losses. The damage observed is caused mainly by mechanical and pathological factors. We identified two phytopathogenic fungi, Fusarium sp. and Aspergilus niger. In addition, we found that average losses were of about 17% among wholesalers, 15% among traders and 27% among households. Keywords: Postharvest losses, onion, phytopathogenic fung

Efficacy of fungicides for control of powdery mildew on grapevines in Chott Sidi Abdel Salam oasis, southeastern Tunisia

Grapevine is an important fruit crop grown in the Chott Sidi Abdel Salam oasis in south eastern Tunisia. It provides great economic potential for the oasis population due to its higher yield and monetary returns. It, also, has a good nutritional value and is consumed fresh or in dried form. Powdery mildew represents one of the most destructive diseases affecting viticulture, especially in temperate-humid climate. It is an economically important fungal disease in the grapevine farms. This pathogen is able to differentially attack leaves and grapes, and is currently controlled with repeated applications of fungicides. This research aimed to use chemical control in order to assess the ability of contact, systemic and the combination of both routes of fungicides’ administration, at three different sampling moments to manage powdery mildew infestation of grapevines (Cv. Bazzoul Kalba), under field conditions. The experiments were conducted in the oasis of Chott Sidi Abdel Salam in southeastern Tunisia. Both Pristine WG and Vectra 10 SC allowed controlling the disease intensity of powdery mildew compared to Talendo® showing a highly significant augmentation of the inhibitory growth potential (84.26% and 88.94%, respectively at 21 days after the first fungicide application) and the protective potential (73.11% and 76.92%, respectively at 21 day). This information can be used to help grapevines growers to improve powdery mildew control and enhance marketable yields

Optimisation d'un enrobe recyclé resistant à l'onriérage

International audienceRÉSUMÉ. Le travail présenté cherche pour différents taux des agrégats d'enrobées, les effets de la température de fabrication et de la durée de malaxage sur le mélange des constituants durant la fabrication ainsi que l'additif de type Plastomères de polyoléfines sur l'amélioration des comportements des enrobé recycle à l'orniérage. L'orniérage est l'un des phénomènes de dégradations le plus rencontré dans les chaussées algériennes. Comme les techniques de fabrication des enrobées recyclés en Algérie est dans la phase de discussion, cette étude est basé sur les techniques utilisés dans les Pays avancés en matière de fabrication des enrobées recyclés. L'hypothèse de formulation utilisée ici suppose que les additif de type Plastomères de polyoléfines ont une influence sur les performances mécaniques (Orniérage) des enrobées recyclés et aussi le taux des agrégats d'enrobé utilisé. Pour justifier cette hypothèse il est obligatoire de passer par la fabrication des enrobées avec différent taux des agrégats d'enrobées et Afin de réduire le nombre des essais expérimentaux nécessaires à cette étude nous avons utilisé la méthode des plans d'expériences. Key words: Enrobé, Recyclage, polymères, environnement, liant, pénétrabilité, </p

Energy Detection with Adaptive Threshold for Cognitive Radio

International audienc

Effect of Solid Phosphate Sludge Amendments on the Growth of Fruit and Forest Trees in the Nursery

Phosphorus deficiency is a major limiting factor in horticultural production. One potential solution can be restoring soil phosphorus from mineral resources, such as solid phosphate sludge (SPS) generated from phosphate treatment processes at mining sites in agriculture. This study explores the possibility of using this sludge in nurseries to produce fruit and forest plants. We tested six mixtures of SPS with the sandy soil of the Maamora forest on ten plant species. In the second experiment, we tested the same mixtures with sea sand. In addition, one concentration of four composts based on phosphate sludge was also tested on two citrus rootstocks and carob. The first experiment’s results showed significantly higher growth with the control mixture for pomegranate, acacia, and C. volkameriana plants. The relative growth was higher at SPS concentrations of 20% to 30% for the other plant species, although there was no significant difference between treatments. The estimations of AUGPC (area under the growth progress curve) showed no significant difference in most species. In the second experiment, the relative growth in the M4 (30% of SPS + 70% of sand) mixture was higher, and the AUGCP showed a significant difference compared to the M1 control mixture. The application of solid phosphate sludge positively affects and improves the growth of fruit and forest trees in the nurseries, especially when the concentration is between 20 and 30%. For this purpose, the phosphate sludge could have great potential to be used in nurseries and create a favourable soil condition as a cultivation substrate

Efficacy of fungicides for control of powdery mildew on grapevines in Chott Sidi Abdel Salam oasis, southeastern Tunisia

Grapevine is an important fruit crop grown in the Chott Sidi Abdel Salam oasis in south eastern Tunisia. It provides great economic potential for the oasis population due to its higher yield and monetary returns. It, also, has a good nutritional value and is consumed fresh or in dried form. Powdery mildew represents one of the most destructive diseases affecting viticulture, especially in temperate-humid climate. It is an economically important fungal disease in the grapevine farms. This pathogen is able to differentially attack leaves and grapes, and is currently controlled with repeated applications of fungicides. This research aimed to use chemical control in order to assess the ability of contact, systemic and the combination of both routes of fungicides’ administration, at three different sampling moments to manage powdery mildew infestation of grapevines (Cv. Bazzoul Kalba), under field conditions. The experiments were conducted in the oasis of Chott Sidi Abdel Salam in southeastern Tunisia. Both Pristine WG and Vectra 10 SC allowed controlling the disease intensity of powdery mildew compared to Talendo® showing a highly significant augmentation of the inhibitory growth potential (84.26% and 88.94%, respectively at 21 days after the first fungicide application) and the protective potential (73.11% and 76.92%, respectively at 21 day). This information can be used to help grapevines growers to improve powdery mildew control and enhance marketable yields