Communications Internationales

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End date: 2019Subject: search.filters.subject.Algeria

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    Association of oxalic and lactic acid for varroa control in Algeria August 2010
    (2010) Adjlane, Noureddine
    Today, the chemical control of Varroa with pyrethroids is difficult, as they are no longer effective. Thus, it is interesting to use natural products such as organic acids. Oxalic and lactic acid were used for the first time in Algeria on 30 colonies of Apis mellifera intermissa in Langstroth hives: A. 45 g of oxalic acid dehydrate dissolved 1 litre 50 % sucrose syrup B. 30 g of oxalic acid dehydrate dissolved 1 litre 50 % sucrose syrup C. Two applications with 5 ml 15 % lactic acid carried out by pouring the acid between the frames, with a 7 day interval Dead Varroa were counted during the trial period by means of greased bottom inserts covering the hive bottom two weeks after the use of the organic acids. The efficacy of the oxalic lactic acid depends on the presence of brood at the time of the treatment. Following efficacies were measured: Application A.: 82.6 %, application B: 65.5% and application C: 75.23 %. Organic acids must be considered as products for integrated Varroa control in Algeria
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    Efficacy of Varroa destrcutor treatments in Algeria
    (2011) Adjlane, Noureddine; Jamal Haddad, Nizar
    Varroa destructor was registered for the first time in Algeria in 1981 through the Algerian-Tunisian border to the east. Since then Algeria has approved the use of several products to control varroa, in order to minimize the impact of this parasite on the bee colonies and honey production. This experiment was conduted in order to study current effectiveness of varroa treatments registered in Algeria,varroa resistant to these treatments ,The trials were conducted in the region of Mitidja (central Algeria) on 75 hives spread over three apiaries. All colonies where equipped with a mesh tray with insert as a diaper greased roasting for counting dead mites. The control treatment is performed with oxalic acid drip; effectiveness was measured by comparing the mites killed during the experimental treatments to mites killed during a control treatment. The results showed a variation in efficacy between the treatments used Bayvarol saves the efficiency ratio is the most important (94.33%), followed Apistan and Apivar with 87.54% and 82.67% respectively. We note a decrease in the efficiency of these products, tests for resistance in vitro are needed to confirm this decline and to detect possible problem of resistance. Natural treatments based on thymol record the lowest with 79.34% for and 72.65% for Thymovar and Apigaurd. Thymol as Apiguard and Thymovar can be regarded as complementary therapies to be integrated into a control program because the success rate is low and thus the beekeeper is required to use an alternative treatment. The information obtained from this study concerning drug efficacy and resistance acaricides are essential for defining the control strategies adapted to the therapeutic treatment of Varroa disease in Algeria.
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    Survey of American foulbrood in honey bee colonies Apis mellifera intermissa in mid- northen region of Algeria (2010-2011)
    (2012) Adjlane, Noureddine; Bounar-Kechih, Saliha; Jammal haddad, Nizar
    American foulbrood caused by Paenibacillus larvae is one of the most serious bacterial diseases of honey- bee brood. Few data are currently available on the prevalence of this disease in Algeria. This study pro- vides an overview of the prevalence of this disease in the Mid-North. Samples of adult bees were collected from 65 apiaries. Detection of spore samples was performed using methods bacteriological, microscopic and biochemical. Spores of Paenibacillus larvae were detected in 23.5 % of the apiaries examined in 2010 and 30 % in 2011. The prevalence of the wreck is different from one region to another. Many factors can possibly explain this difference in the prevalence of the disease.
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    Effect of petrophysical and sedimentological properties 1on heterogeneity of carbonate reservoirsin South Eastern 2Constantine’sReservoirs in Algeria: impact on produc-3tion parameters
    (2019) Baouche, Rafik; Boutaleb, Khadidja; Debiane, Kahina
    Carbonated reservoirs, concentrated mainly in the Middle East, contain about 50% of 10 the world's hydrocarbon resources and the challenge they represent for the sustainable devel-11 opment of oil resources is considerable and their production challenges are commensurate with 12 this potential. 13 The characterization of these reservoirs through the control of their heterogeneities makes it 14 possible to reduce the uncertainties on the quantification of their reserves in order to improve 15 their productivity as well as their recovery rate. 16 The recovery rates obtained from the carbonate reservoirs are mainly attributed to their deposi-17 tional environments, diagenetic history, and the very varied climatic conditions, resulting in a 18 very heterogeneous geology and represent difficult challenges to overcome where the permea-19 bility varies greatly, the only requirement for better results in production. The permeability 20 measured on cores or by production tests can vary from less than 10% to more than 40% on 21 average permeability deposits (10 to 100 md)). In addition to these parameters, the diversity of 22 recovery mechanisms and development patterns, on which the dynamic behavior of the intersti-23 tial fluids depends, are far from being conditioned by the single permeability factor. 24 Nowadays, in Algeria, the valorization of carbonated reservoirs, mainly located at the level of 25 South Eastern Constantinois reservoirs where most of these reserves remain unexploited, are 26 among the strategic and priority objectives, because of their complexity. 27 Indeed, the study of stratigraphic heterogeneities, obtained from logging data and core studies, 28 applied to SouthEastern Constantinois reservoirs (Algeria), shows that the results play an 29 important role in the development of carbonate reservoirs production in this area.
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    Global CSP market trends and advanced configurations for Algeria
    (2013) Behar, Omar; Khellaf, Abdallah; Mohammedi, Kamal; Ait Kaci, Sabrina
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    Analysis of rock mechanical parameters from well log data and Dipole Shear sonic Imager. Application to Algerian sahara "Algeria"
    (2009) Eladj, S.; Baouche, Rafik
    The use of 'DSI' (Dipole Shear sonic Imager), in the Tin Fouye Tabankort area in Algeria allowed the exploitation of the rock mechanics properties in the field of drilling having for objective determination of the margin of ability of the well. The tool 'DSI' has a considerable advantage by its application which makes it possible to combine the technology of monopole and of dipole and to offer an effective method for the determination of the acoustic dynamic mechanical properties in - situ. The practical results of this study showed that: 1 - The phenomenon of BIOT is less when the medium is impermeable, 2- There is a significant effect of the petrophysic properties on the mechanical properties expressed by the effect of the coefficient of BIOT on the variation of the values of the density of mud. The beach of variation of the stability of the well obtained starting from the tool 'DSI' lies between the values 1.40 g/cc and 1.80 g/cc. On the other hand the results obtained by the application of Leake-off test and the successive increase in the density of mud vary from 1.50 g/cc with 1.90 g/cc. With the base of these results, it is necessary to note that the result obtained by tool DSI is almost closer than the practical methods and the percentage of error obtained by the application of this tool is due to the difference between the dynamic and static mechanical properties. The finality of this study is to determine a field of application of this new technique in the study of the stability of the well during drilling