Publications Internationales
Permanent URI for this collectionhttps://dspace.univ-boumerdes.dz/handle/123456789/13
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Item Physicochemical and Microbiological Characteristics of Some Samples of Honey Produced by Beekeepers In Algeria(De Gruyter Open Sp. z o.o., 2014) Adjlane, Noureddine; Jamal Haddad, Nizar; Kesraoui, Saida; Laid Ameur, Karima; Moussaoui, DjamilaThis study aims to evaluate the physicochemical and microbiological quality of 11 samples of locally produced honey harvested from bee colonies across different regions of Algeria. Honeys analyzed are characterized by their different floral origins. Want germs are total aerobic mesophilic flora, total coliforms, anaerobic bacteria Sulfito-Drive (clostridium), yeasts and moulds. Water content, pH, the concentration of hydroxymethylfurfural and sucrose content were also measured. For the physicochemical properties, most of the samples meet the requirements of Codex Alimentarius. Microbiological results showed that there is heterogeneity in the load of microorganisms sampled. Honeys have a low microbial profile. Total coliforms and clostridium were not detected in any sample. For counting the total aerobic mesophilic flora (TAMF), two local and imported samples have a concentration greater than the standard TAMF. Yeasts and moulds were also present but at low levels, and figures in all but three samples were below the normItem Study and analysis of the Magneto-Mechanical behavior of smart composite sandwich beam in elastomer(2019) Settet, Ahmed Tidjani; Aguib, Salah; Nour, Abdelkader; Zerrouni, NassimItem Seminumerical technique for the analysis of integrated semiconductor devices(1994) Dehmas, Mokrane; Zitouni, Abdelkader; Bourdoucen, H.Item Quasi-static MoL-based approach for the analysis of multilayer transmission line structures(John Wiley & Sons, 1997) Zitouni, Abdelkader; Bourdoucen, H.; Nait Djoudi, T.Item Analysis of crack evaluation standards in welded joints of pipelines(Elsevier, 2005) Bouzid, R.; Bouali, E.; Gaceb, M.Item Analysis of predictive models of oil transportation ducts rehabilitation(2012) Abdelbaki, Noureddine; Bouali, Elahmoun; Gaceb, Mohamed; Bettayeb, MouradThe actions of the various phenomena of corrosion, mechanical constraints and others, contribute to the degradation of hydrocarbons transportation ducts. The combinations of th ese phenomena accelerate pipe ageing, and this results in the increase of the frequency of leaks interventions and pipe ruptures. The only way to struggle against the ageing of oil transportation pipelines is the rehabilitation. This will allow the re - serv icing of pipes whose resistance characteristics are degraded. One of the major difficulties, during the conception of a pipeline rehabilitation program, is the determination of the specific sections to rehabilitate. Indeed if there is any real risk not to do enough rehabilitation in the one hand, there is a risk to bad rehabilitation on the other. The decision to continue to maintain, renovate or replace some degraded sections of a pipeline is not an easy task, and requires development of forecasting models that will enable decision - makers to take the right decisions on the middle and long term. In this context, this study is devoted to analysis of problems associated with statistical exploitation of controls and repair files of aged pipes, establishing acti on plans and controlling the ageing of hydrocarbons transportation pipelinesItem Laminate reinforced with natural fibers of dwarf palm tree (Doum)(2009) Amer, M.; Tahar Kamal, A.I.T.; Boukais, S.; Bouamra, Y.Item Methodological approach of selecting a vibration indicator in monitoring bearings(Academic Journals, 2013) Djebili, Omar; Bolaers, F.; Laggoun, A.; Dron, J. P.A rolling bearing is an important element in a rotating machine. Whatever the operating conditions, it is subject to fatigue which causes spalling. In aiming to obtain the most possible real fatigue curve, the vibration level is shown according to different statistical indicators such as the RMS (Root Mean Square), the kurtosis, the crest value, the crest factor and the peak ratio, then to choose the best of them that is able to show the evolution of the bearing degradation. In this work, through the experimental vibratory follow up of the thrust bearing spall using different statistical indicators, we present an optimization methodology in order to find a most significant indicator that is able to characterize the damage evolutionItem Bearing fault diagnosis in induction machine based on current analysis using high-resolution technique(2007) Djeddi, M.; Granjon, P.; Leprettre, B.In this paper, we propose to perform early fault diagnosis using high-resolution spectral analysis of the stator current to detect bearing faults in electrical induction machine. While most research works focus on mechanical vibration analysis, the originality of our work relies on the use of high-resolution methods to detect modulations in the stator current. We present the results obtained for real data to detect inner and outer raceway bearing defects made articially as well as bearing defects obtained through on-site ageing. The obtained results show that the proposed method yields better detection than classical spectum analysis