Three-dimensional Numerical Analysis of a Joint Bonded Reinforced with Silica Nanoparticles (SiO2)

Nanostructured adhesives may be defined as those materials whose elements imbedded in an epoxy matrix have dimensions in the 1 to 100 nm range. One of the most interesting aspects of ceramic nanoparticles is that their mechanical properties depend strongly upon the particle size and shape. Silica nanoparticles (SiO2) have different physical and mechanical properties from bulk ceramics. The aim of the present study is to investigate the effect of the nanoparticles rate on the equivalent stress, peeling stress and shear stress as well as the strains developed in the adhesive joint. Three-dimensional finite element models of adhesive joint were developed to determine the stress intensity as well as strain with different nanoparticles rate in the epoxy resin. Dispersion of nanoparticles with different percent in the epoxy resin allows for reinforcing the adhesive. Polymer embedded silica nanoparticles (SiO2) proved to be highly effective

Anti-hyperuricemic and neuroprotective effects of Populus nigra L. (Saliacaceae) flower buds used in Algerian folk medicine

Context: Populus nigra L., is a species of cottonwood poplar that belongs to the Salicaceae family, is cultivated in multiple areas in Algeria, with an Algerian name of Safsaf. Aims: To evaluate the Populus nigra flower buds extract for its effects on brain modifications against aluminum-induced neurotoxicity in mice. The hypouricemic action of the extract was also evaluated. Methods: To evaluate the effect of extract on AlCl3-induced neurotoxicity on mice a battery of tests was performed to assess a spectrum of learning and memory functions. The hypouricemic action of the extract was studied by the measure of uric acid levels and liver xanthine oxidoreductase activity in normal and hyperuricemic mice. Results: Co-administration of P. nigra extract (200 mg/kg) and AlCl3 (100 mg/kg/day) combined with D-galactose (200 mg/kg/day) during four weeks was found to antagonize the harmful effects of AlCl3 by restoring all the test parameters. Moreover, extract restored the pyramidal cells to near normal in cerebral cortex of mice. Extract, when administered three times orally to the normal and oxonate-induced hyperuricemic mice, was able to elicit significantly hypouricemic effect comparable to that of allopurinol. Conclusions: P. nigra flower buds extract can be considered as food enabling to antagonize AlCl3 toxicity and to control serum uric acid levels

The Effect of the Projectile Shape on the Stress Biomechanical Behavior of Dental Implant: Three-dimensional Analysis

The finite element method is used to solve mechanical and physical problems in engineering analysis and design. Primary stability has been regarded as a prerequisite for osseointegration of dental implants. Biomechanical factors play a key role in the success of dental implants. The study of impact velocity is relevant to the biomechanics of dental implants. The purpose of this analysis was to determine the intensity and distribution of stresses in the dental prosthesis elements (crown, framework, implant, abutment, bone) and the sliding at the bone–implant interface under the effect of a mechanical impact of different geometric shape of projectile, this shock simulates a stone throw or other objects coming into contact with the dental prosthesis

Repellency and toxicity of azadirachtin against granary weevil Sitophilus granarius L. (Coleoptera: Curculionidae)

International audienceThe granary weevil, Sitophilus granarius (L.) (Coleoptera: Curculionidae), is known as a primary pest; and is able to feed on whole and undamaged cereal grains. This pest is probably one of the most destructive stored-product insect pests throughout the world affecting the quantity as well as quality of the grains. We have evaluated the fumigant and contact toxicity and the repellent property of azadirachtin a neem-based insecticide against S. granarius adults. Azadirachtin was found to exhibit fumigant and contact toxicity and the mortality increased as function the concentration and exposure time. In addition, the obtained results revealed an increase in the percent repellency as a function of concentration. Biomarker measurements in treated adult (LC25 and LC50) revealed, activation of detoxification system as showed by an increase in CAT and GST activity and also a decrease in GSH rate. Moreover, nutrition depletion index was found to be concentration dependent depicting maximum reduction at LC50 concentration. The biochemical compositions show that azadirachtin affected the energy reserves of adult of S. granarius. The results of persistence testing of azadirachtin applied by fumigation showed that their toxicity decrease as function the time. This study has highlighted the bioinsecticide activity of azadirachtin against granary weevil

Activity of a lipid synthesis inhibitor (spiromesifen) in Culiseta longiareolata (Diptera: Culicidae)

Objective: To evaluate the activity of spiromesifen against the most abundant and investigated mosquito species, Culiseta longiareolata Aitken, 1954 (Diptera, Culicidae). Methods: Culiseta longiareolata larvae were collected from untreated areas located at Tébessa (Northeast Algeria). A commercial formulation of spiromesifen (Oberon® 240 SC) was tested at different concentrations ranging between 238 and 1428 μg/L on newly molted fourth-instar larvae under standard laboratory conditions according to Word Health Organization recommendations. The effects were examined on the mortality, the morphometric measurements, two biomarkers (catalase and malondialdehyde), and the biochemical composition of larvae, respectively. Results: The compound exhibited insecticidal activity. Moreover, it disturbed growth and several morphological aberrations were observed. It also affected body volume, biomarkers and contents of carbohydrates, lipids and proteins. A marked effect on lipids and malondialdehyde was noted, confirming its primary mode of action on lipid synthesis. Conclusions: Spiromesifen appears less potent than other insecticides tested such as the insect growth disruptors. Keywords: Culiseta longiareolata, Spiromesifen, Toxicity, Biochemical composition, Biomarker

Abstracts of the First International Conference on Advances in Electrical and Computer Engineering 2023

This book presents extended abstracts of the selected contributions to the First International Conference on Advances in Electrical and Computer Engineering (ICAECE'2023), held on 15-16 May 2023 by the Faculty of Science and Technology, Department of Electrical Engineering, University of Echahid Cheikh Larbi Tebessi, Tebessa-Algeria. ICAECE'2023 was delivered in-person and virtually and was open for researchers, engineers, academics, and industrial professionals from around the world interested in new trends and advances in current topics of Electrical and Computer Engineering. Conference Title: First International Conference on Advances in Electrical and Computer Engineering 2023Conference Acronym: ICAECE'2023Conference Date: 15-16 May 2023Conference Venue: University of Echahid Cheikh Larbi Tebessi, Tebessa-AlgeriaConference Organizer: Faculty of Science and Technology, Department of Electrical Engineering, University of Echahid Cheikh Larbi Tebessi, Tebessa-Algeri