Gastrointestinalni paraziti deva na jugu Alžira

This study aimed to identify gastrointestinal parasites in camels (Camelus dromaderius) in the Laghouat region (southern Algeria). The study was carried out over a 5-month period on a total of 100 dromedaries. Dung samples were analysed using different methods such as flotation, sedimentation, and Ziehel-Neelsen staining for research of the cryptosporidiosis. Data showed an overall infestation rate of 78%, with the presence of the following parasites: Cryptosporidium spp. (60%), Nematodes: Nematodirus spp. (23%), Strongyloides spp. (4%), Marshallagia spp. (2%), and Cooperia spp. (3%), different protozoaires: Eimeria spp. (20%), Neobalantidium spp. (2%), and Balantidium coli, cestodes (6%), Moniezia spp. (3%), Multicips spp. (2%), Diphillobothrium spp. (1%), and trematodes: Fasciola hépatica (4%) and Paramphistomum spp. (1%). The results showed a significant influence of study site on the parasitic infestation rate (P=0.039). Other factors (sex, age and clinical aspect) had no significant influence. To conclude, gastrointestinal parasites are a major problem of indigenous camels under traditional husbandry. Therefore, parasite control programmes are recommended to increase the productivity of this useful animal.Ova je studija imala za cilj identificirati gastrointestinalne parazite deva (Camelus dromaderius) u regiji Laghouat na jugu Alžira. Istraživanje je provedeno tijekom razdoblja od 5 mjeseci na 100 jednogrbih deva. Uzorci su analizirani koproskopijom uporabom različitih metoda: flotacije, sedimentacije i Ziehel-Neelsen bojenja za pretragu kriptosporida. Podatci su pokazali sveukupnu stopu infestacije od 78 %. Ova je studija otkrila prisutnost sljedećih parazita: Cryptosporidium spp. (60 %), oblića: Nematodirus spp. (23 %), Strongyloides spp. (4 %), Marshallagia spp. (2 %), i Cooperia spp. (3 %), različitih protozoa: Eimeria spp. (20 %), Neobalantidium spp. (2 %), i Balantidium coli. Ostali paraziti zamijećeni u ovom radu su: trakavice (6 %), Moniezia spp. (3 %), Multiceps spp. (2 %), Diphillobothrium sp. (1 %), metilji: Fasciola hépatica (4 %), Paramphistomum spp. (1 %). Rezultati su pokazali značajan utjecaj lokacije studije na stopu infestacije parazitima (P=0,039). Ostali čimbenici (spol, dob i klinički aspekt) nisu imali značajniji utjecaj. Rezultati našeg istraživanja su pokazali da su gastrointestinalni paraziti veliki problem autohtonih deva u tradicionalnom stočarstvu, stoga se preporučuju programi kontrole parazita za povećanje produktivnosti ovih korisnih životinja

On the Thermomechanical Behavior of Laminated Composite Plates using different Micromechanical-based Models for Coefficients of Thermal Expansion (CTE)

In this paper, the influence of the Coefficient of Thermal Expansion (CTE) on the thermal stress analysis of laminated composite plates is explored. By introducing the undetermined integral terms in the displacement field, a new simple and efficient higher-order shear deformation theory is formulated for the thermo-mechanical behavior of thick laminated composite plates. This formulation aims to reduce the number of generated unknowns. Typically, a reduced order of the governing partial differential equations is expressed using the principle of virtual displacements. By using Navier’s technique, closed-form solutions are derived for laminated composite plates under thermal and/or mechanical loading. Unfortunately, several traditional research investigations significantly depend on the rule of the mixture to determine reliable CTE for composites. This paper offers and examines a variety of analytical micromechanics-based models for estimating CTE in laminated composite materials, incorporating into consideration different considerations. The obtained results are compared to those given by other alternative plate theories, and the efficiency and accuracy of the present theory are demonstrated for the thermomechanical behavior of laminated composite plates. This study reviews and applies several micromechanics-based models, contrary to previous investigations. Laminated composite plates could delaminate or crack due to the matrix material's longitudinal CTE, affecting fiber volume fraction and stacking sequence. Micromechanics-based approaches are important when arbitrary thermo-mechanical characteristics can generate inaccuracies. Interestingly, micromechanics-based models can estimate effective CTE. Schapery, Chamberlain, and Chamis provide models with identical longitudinal CTE. For increasing fiber volume fractions, Chamberlain's model is more sensitive to increasing fiber volume fractions. Mechanical stress changes laminated plate behavior more than thermal loading. Although all presented micromechanical-based models have simplified representations, this research attempts to provide a standard for future investigations. The use of detailed micromechanical-based models stimulates further progress in understanding and utilizing complex composite plates

Abstracts of 1st International Conference on Computational & Applied Physics

This book contains the abstracts of the papers presented at the International Conference on Computational & Applied Physics (ICCAP’2021) Organized by the Surfaces, Interfaces and Thin Films Laboratory (LASICOM), Department of Physics, Faculty of Science, University Saad Dahleb Blida 1, Algeria, held on 26–28 September 2021. The Conference had a variety of Plenary Lectures, Oral sessions, and E-Poster Presentations. Conference Title: 1st International Conference on Computational & Applied PhysicsConference Acronym: ICCAP’2021Conference Date: 26–28 September 2021Conference Location: Online (Virtual Conference)Conference Organizer: Surfaces, Interfaces, and Thin Films Laboratory (LASICOM), Department of Physics, Faculty of Science, University Saad Dahleb Blida 1, Algeria