Université Mouloud Mammeri de Tizi Ouzou (UMMTO): Research Review of Sciences and Technologies
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Mise en Equations des Propriétés Physiques, Mécaniques, et Thermiques des Bétons Contenant des Déchets Plastiques
Get PDFResearch on concrete containing plastic waste has made it possible to understand their behavior and to demonstrate the relevance of their use. But it is clear that equations governing the behavior of this type of concrete are lacking. In this logic, this study is in line. The objective is then, to propose formulas governing the physical, mechanical and thermal properties of concrete containing plastic waste. The proposed formulas were validated by referenced test values. In total, five hundred and twenty-four experimental and theoretical values were processed and analyzed. The experimental values were collected and analyzed and compared with the theoretical values from the proposed equations. The results obtained allowed to conclude that the proposed equations are all relevant. La recherche concernant les bétons contenant des déchets plastiques, a permis de comprendre leur comportement et à démontrer la pertinence de leur utilisation. Mais force est de constater que des équations qui régissent le comportement de ce type de béton font défaut. Dans cette logique, s’inscrit donc cette étude. L’objectif est alors, de proposer des formules régissant les propriétés physiques, mécaniques et thermiques des bétons contenant des déchets plastiques. Les formules proposées ont été validées par des valeurs d’essais référenciées. Au total, cinq cent vingt-quatre valeurs expérimentales et théoriques ont été traitées et analysées. Les valeurs expérimentales ont été collectées et analysées puis comparées aux valeurs théoriques issues des équations proposées. Les résultats obtenus ont permis de conclure que les équations proposées sont toutes pertinentes.
إعادة بناء القيمة الثقافية للمصطلح المستحدث في المجال السياسي بين الاستحالة والامكان
Get PDFتهدف هذه الدراسة إلى تسليط الضوء على عوائق وإجراءات ترجمة البعد الثقافي في المصطلحات السياسية المستحدثة من اإلنجليزية إلى العربية، خاصة تلك التي أ ظهرت خالل العقدين دت إلى حداث وتحوالت سياسيةا أ خيرين لما شهدتههذه الفترة من ا أ اال استحداث مصطلحات عديدة غريبة لغويا وثقافيا عن اللغة العربية ومحملة بحموالت ثقافية ثناء ترجمتها. كما نهدف إلى أ تعبر عن ثقافتها وبيئتها الحاضنة
Research on Using Dolomite Aggregate as Cement Treated Base for Highway Pavement Construction in Ninh Binh, Vietnam
Get PDFDolomite is commonly used in the construction of highway pavement in the world. However, there are still no concrete specifications or regulations on the use of dolomite for highway construction. Dolomite is available in huge quantities in NinhBinh Province. This is a high potential material for grain bases of highway pavement structure. The alternative material could be a considerable contribution to diversify the supply of aggregate resources for highway pavement construction in the province, and thus contribute to the conservation of natural landscape heritages and limestone resources for related building materials manufacturing industries. In order to evaluate the use of dolomite in highway pavement construction, a research program is conducted to test the working capacity of the cement treated dolomite aggregate, which is intended to use as upper base material in pavement structure. The experimental results showed that the mechanical indicators of the mixture satisfy the requirements for the base layers of highway pavement structure
Multi-level damage detection using a combination of deep neural networks
Get PDFIn recent years, bridge damage identification using a convolutional neural network (CNN) has become a hot research topic and received much attention in the field of civil engineering. Although CNN is capable of categorizing damaged and undamaged states from the measured data, the level of accuracy for damage diagnosis is still insufficient due to the tendency of CNN to ignore the temporal dependency between data points. To address this problem, this paper introduces a novel hybrid damage detection method based on the combination of CNN and Long Short-Term Memory (LSTM) to classify and quantify different levels of damage in the bridge structure. In this method, the CNN model will be used to extract the spatial damage features, which will be combined with the temporal features obtained from Long Short-Term Memory (LSTM) model to create the enhanced damage features. The combination successfully strengthened the damage detection capability of the neural network. Moreover, deep learning is also improved in this paper to process the acceleration-time data, which has a different amplitude at short intervals and the same amplitude at long intervals. The empirical result on the Vang bridge shows that our hybrid CNN-LSTM can detect structural damage with a high level of accuracy
Thermo mechanical characteristics of Sisal fibre reinforced composites after treatment with potassium permanganate and stearic acid
Get PDFThis paper presents an experimental study of epoxy and sisal fibre composites with and without potassium permanganate and stearic acid treatment. A compression moulding technique was used to develop the composites. Differential Scanning Calorimetry (DSC), tensile and flexural tests, and scanning electron microscopy were used to investigate the thermal and mechanical behaviour of these composites. SEM images of sisal fibres revealed improvements in the fibre's surface topography further to the surface stearic acid treatment process. X-ray diffraction (XRD) analysis reveals that sisal fibre is crystalline in nature. When sisal fibre was treated with streaic acid, the tensile strength increased to 43.45 MPa. Potassium permanganate-treated fibre reinforced composites demonstrated high potential flexural strength. SEM analysis revealed that stearic acid-treated fibre improved interfacial adhesion between the fibres and matrix
Evaluation of Tribological aspects of Al-Si 12 alloy and their Metal Matrix hybrid Composites produced by Liquid-metal Forging Method
Get PDFParticulate Aluminium Metal Matrix Composites (Al-MMC) have emerged as advanced engineering materials in view of their improved properties. Ceramic reinforced Al-MMC were more suitable because of being economical and exhibiting isotropic properties. Al-MMCs manufacturing methods are expensive, demand skilled and complex operations and vortex liquid metallurgy results into higher porosity. The liquid-metal forging/squeezed casting of stirred molten slurry can eliminate porosity as molten metal is pressurized during solidification forming near net shapes. During many instances, influence of process parameter (PP)s on mechanical part properties is being studied. In the present study, composites were produced using Al-Si12 alloy as base material, aluminium oxide and silicon carbide particles as reinforcements by varying the PPs. Tribological tests were conducted under dry sliding condition at room temperature showed hard reinforcements in Al alloy reduced the wear rate (WR) and increased the coefficient of friction (f) for all PPs. For PPs, increasing the squeeze pressure and decreasing the pouring and die preheating temperature resulted in a reduction of WR and f with an increase in normal load and sliding velocity. Initially f falls and then raised with an increase in normal load, but only raised with growing sliding velocity compared to Aluminium base material.
السؤال الثّقافي والاجتماعي في الرّواية الجزائرية ما بعد الحداثية -مسائل الذاكرة العالقة عند سمير قسيمي-
No full textThe problem of history and novel is seemingly an endless and constant process. Due to its flexible and adaptable characteristics, the problem still gains a remarkable attention among literary scholars. The fact that change and creativity are fundamentally related, in which the literary discourse evolves and goes places never been existed before. Despite being described as a consistent field due to its dependence on facts and numbers, still its credibility comes from documenting. That gives historical material a prestigious position and almost an indubitable one.This paper is dedicated to study and analyze the endless relation between literature and history. More precisely how did Samir Qassimi tackle history, and how are the major historical events represented in his novels
أخلاقيات البيئة في الفكر الإسلامي المعاصر
No full textThis article deals with environmental ethics in contemporary Islamic thought, through the studies presented by Islamic thought to address the environmental problem.The desired goal to be achieved through this research is not to repeat what was written in the framework of this thought of partial treatments, but rather to extract the general principles and rules that it presents as controls for human behavior when dealing with the various components of nature.By answering the following question: What is the nature of the relationship that should be between man and nature through contemporary Islamic thought?There is no doubt that humanity needs to hear what different cultures - other than the prevailing Western culture - offer of ideas and moral standards, perhaps contributing to solving human problems
الإيديولوجي والشّعري في النّصوص الفائزة في مهرجان الشّعر النّسوي بقسنطينة
Get PDFThis article broaches the intersection of the ideological and the poetic in the winning texts in the festival of the feminist poetry in Csantina, in the second session of 2009. The festival was about the issue of resistance where we examined the formation of the ideological, the creation of meaning and the symbolism of resistance, and how resistance upsurged between the identification of the feminist self and the cause