http://dspace.univ-setif.dz:8888/jspui/handle/123456789/528 2026-04-11T09:10:49Z 2026-04-11T09:10:49Z Abderrezag, Sara http://dspace.univ-setif.dz:8888/jspui/handle/123456789/5939 2025-10-20T14:33:20Z 2025-10-20T00:00:00Z

Titre: Acquisition et analyse des ondes sonores dans les roulement Auteur(s): Abderrezag, Sara Résumé: There are several methods to assess different types of defects. This work presents one of these techniques using sound as a diagnostic tool of bearings. To achieve our aim, several studies are conducted to test the effectiveness of the proposed method and locate the fault source created. The processing of the detected sound signal is difficult because of other noises polluting the main signal, which pushed us to use the envelope analysis, but we think that pretreatment is necessary with a good choice of the sensor

2025-10-20T00:00:00Z CHALAL, Daoud http://dspace.univ-setif.dz:8888/jspui/handle/123456789/5121 2025-10-21T15:23:46Z 2025-02-10T00:00:00Z

Titre: Conception et réalisation d'un dispositif de détection et coupure d'urgence de l'arrivée du gaz Auteur(s): CHALAL, Daoud Résumé: Our project aims to protect lives and property from household gas accidents, such as carbon monoxide poisoning, fires, and explosions that have claimed the lives of many Algerians. We have designed and implemented an innovative protection system that works intelligently and independently, capable of monitoring and detecting risks in real time and automatically intervening in emergency situations. The system issues an alert, closes the main valve of the household gas, and makes a phone call to request assistance. The model has been implemented and subjected to accurate tests. The results of these tests have shown exceptional performance in detecting gas and activating automatic procedures. The device has demonstrated its ability to respond effectively in the event of a gas leak, which enhances confidence in its ability to ensure the safety of users.

2025-02-10T00:00:00Z MADJOUR, Rabab http://dspace.univ-setif.dz:8888/jspui/handle/123456789/5120 2025-10-21T15:15:34Z 2025-02-10T00:00:00Z

Titre: Etude et élaboration d’un capteur imprimée en 3D pour la détection des métaux lourd dans l’eau Start-up Auteur(s): MADJOUR, Rabab Résumé: In recent decades, 3D printing has revolutionized various fields with its ability to create complex structures at reduced costs. In this research work, we focused on developing a 3D-printed electrochemical sensor using electrodes made of carbon-black-loaded PLA for detecting heavy metals in water, such as lead and copper. This approach offers an innovative, reliable, and cost-effective solution for monitoring water quality and protecting the environment.

2025-02-10T00:00:00Z LAMISSE, IATIME http://dspace.univ-setif.dz:8888/jspui/handle/123456789/5119 2025-10-21T15:13:42Z 2025-02-10T00:00:00Z

Titre: Etude statistique par la méthode de weibull de lavariabilité de la résistance à la flexion d'un verre sablé Auteur(s): LAMISSE, IATIME Résumé: In general, mechanical strength, lifetime, and all other properties related to defect distribution in a brittle material typically exhibit wide dispersion during experimental estimation. Among various statistical methods, we focused on the application of the Weibull method. This model is often used to characterize the variability of mechanical strength in brittle materials, which is closely linked to the distribution of existing defects. Its application requires determining the Weibull modulus mmm and characteristic stress os from experimental data. In our study, under different test conditions, we varied the sand projection velocity V, sand rain size, and projected mass, with a constant impact angle a-90°. We determined the parameters m and da using linearization methods of the model (both numerical and graphical) from multiple batches of 20 identical samples of flat soda-lime glass. Based on experimental values of mechanical strength ranging from 15 to 54 MPa, estimates of the Weibull modulus m varied between 3.067 and 7.329. Values of do ranged from 22 to 98 MPa. The Weibull plots exhibited a unimodal behavior, suggesting a single statistical family of defects governing mechanical strength. This hypothesis was supported by micrographic observations of samples damaged by sand impacts.

2025-02-10T00:00:00Z