University of Boumerdes (Arabic: جامعة بومرداس, French: Université de Boumerdès), or M’Hamed Bougara University of Boumerdés (Arabic: جامعة امحمد بوڨرة-بومرداس), abbreviated as UMBB is a university located in the center of Algeria in the Boumerdès Province. It was established in 1998.
Research background and purpose: Growing environmental challenges have increased consumer interest in eco-friendly products, yet the mechanisms through which environmental awareness and environmental cognition shape green purchasing intention remain insufficiently explored. This study examines how consumers' understanding of environmental issues and their awareness of ecological consequences influence their intention to purchase green products. Design/methodology/approach: A quantitative approach was adopted using a structured survey. Factor analysis was conducted to validate the measurement structure, followed by ANOVA to assess differences among consumer groups and test the impact of environmental awareness and cognition on green purchase intention. Findings: Results show that both environmental awareness and environmental cognition significantly influence consumers' intention to purchase green products. Higher levels of environmental concern and understanding are associated with stronger intentions to choose eco-friendly options. The analysis further highlights the value of segmenting consumers based on environmental attitudes to improve the effectiveness of green marketing strategies. Value added and limitations: The study contributes to the literature by simultaneously examining awareness and cognition as predictors of green purchase intention, offering insights for policymakers and marketers aiming to promote sustainable consumption. However, the research focuses on intention rather than actual purchasing behavior. Future studies should investigate real buying patterns and consider external moderating factors such as price, product availability, and cultural influences.
Lithium-ion batteries are an essential element for the modern age when striving for sustainable green energies, they have several advantages and are used everywhere; however, optimal monitoring and management of lithium-ion battery parameters in different conditions is still a challenging research topic. One of its key parameters is a state of charge (SoC). Although there has been a significant optimization in state-of-charge estimation methods recently, further improvements are still to be made, such as reducing computational complexity, moreover reducing the dependency on the operating conditions, This paper presents a new technique for the state-of-charge estimation that relies on combining coulomb counting as the main method, and online open-circuit voltage identification for the calibration during the charging phase. The proposed method uses a modified charging protocol by applying a predefined current pulse and based on an equivalent circuit model. To evaluate the work, a set of experiments was conducted on two different lithium-ion cells that resulted in an RMSE of 2mV for one cell, and 5.28mV for the other cell in online open-circuit voltage estimation, moreover an RMSE of 0.29
This study investigates the effect of processing strategy on the structure-property relationships of bio-based epoxy composites reinforced with pine rosin powder extracted from Pinus halepensis trees in Algeria's Green Dam. Two processing protocols were employed: P 1 (fixed epoxy-to-curing-agent ratio) and P 2 (fixed curing-agent proportion). Composites containing 10 - 40 w t % rosin were fabricated and characterized using Fourier Transform Infrared Spectroscopy ( F T I R ), X - r a y Diffraction ( X R D ), Thermogravimetric Analysis ( T G A ), Scanning Electron Microscopy ( S E M ), tensile and flexural tests. F T I R confirmed hydrogen-bonding interactions between rosin and epoxy without new chemical bonds, while X R D patterns revealed an increase in amorphous character. T G A indicated reduced thermal stability compared to neat epoxy, attributed to the low-molecular-weight fractions of Pine rosin. S E M showed more uniform particle dispersion and stronger interfacial adhesion in P 2 , correlating with improved mechanical retention. Tensile and flexural tests revealed that rosin acts as a natural plasticizer: strength and modulus decreased gradually with increasing rosin content, while ductility improved. Optimal performance was achieved at 10 - 20 w t % rosin under P 2 , maintaining about 42 M P a tensile and 44 M P a flexural strength. At higher loadings ( >= 30 w t % ) , agglomeration caused embrittlement. These findings demonstrate that the processing route critically governs the microstructure and mechanical behavior of bio-based epoxy composites. Algerian pine rosin thus provides a sustainable and cost-effective bio-filler for developing flexible, partially bio-based epoxy materials suited for coatings, adhesives, and structural applications.
Vacancy-type defects in 6H-SiC single crystals and their evolution under irradiation were investigated using positron annihilation spectroscopy. Immediately after irradiation, silicon monovacancies (VSi) aggregate into stable (VSi-VC)3 hexavacancy clusters, which persist across the full dose range, indicating early defect saturation and the absence of further clustering. With increasing fluence, additional VSi are primarily eliminated through recombination with interstitials, which becomes the dominant defect-annihilation mechanism. An increase of the irradiation temperature enhances VSi mobility and accelerates the onset of saturation. These results demonstrate that (VSi-VC)3 represents the final, highly stable aggregated form and radiation-resistant vacancy configuration in 6H-SiC under the present irradiation conditions. This remarkable radiation tolerance of 6H-SiC confirms its suitability for next-generation nuclear systems and radiation-hardened electronic devices.
Wide-stopband plasmonic filters are critical components for the development of compact mid-infrared (MIR) photonic systems. In this study, we propose a geometrically tunable wide-stopband plasmonic filter based on a meta-insulator-metal (MIM) waveguide integrated with dual resonator cavities. The optical response of the proposed structure is numerically investigated using the twodimensional finite-difference time-domain (2D-FDTD) method. We systematically analyze the influence of key geometric parameters, specifically the resonator height (H2) and inter-cavity distance (D), on the stopband characteristics. Our results demonstrate that the symmetric dual-cavity configuration provides effective control over both the stopband bandwidth and central wavelength. Consequently, the proposed design achieves a significantly broadened stopband while preserving structural compactness and high transmission selectivity, making it a highly promising candidate for integration into advanced MIR photonic circuits and sensing systems.
