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排序方式: 共有113条查询结果,搜索用时 31 毫秒
1.
Hallal Nassim Yelles Chaouche Abdelkrim Hamai Lamine Lamali Atmane Dubois Laurent Mohammedi Yahia Hamidatou Mouloud Djadia Leila Abtout Abdeslam 《Bulletin of Engineering Geology and the Environment》2019,78(8):5653-5670
Bulletin of Engineering Geology and the Environment - A better understanding of the spatiotemporal evolution of landslides in urban zones is a key factor in assessing the risk of future slides... 相似文献
2.
Wireless Networks - Since the introduction of the original IEEE 802.11 medium access mechanism, the definition of the multicast access mechanism has been the subject of numerous amendments and... 相似文献
3.
In hydrogen storage, the concept of the reversible capture still remains a major issue to be addressed. The advances in chemical storage provide useful data that demonstrate that purely physical adsorption offer promising prospects, even though the hydrogen uptakes barely attain 11 wt%. The emerging nanotubes, fullerenes, metal-organic frameworks are sophisticated structures that display weak affinity toward hydrogen, and require complex synthesis procedures. Adsorption rather consists of a gas condensation at low temperatures and/or high pressures. That is why the present review is devoted to the most recent achievements in developing novel microporous materials with emphasis on silicon-based structures, aluminosilicates and related materials. Their large availability and low production costs open promising prospects. On aluminosilicates, low Si:Al ratio, high porosity and specific surface area, along with alkali or alkaline-earth exchangeable cations are essential requirements for effective hydrogen adsorption even at room temperature. 相似文献
4.
Mokhtar Adel Boukoussa Bouhadjar Baba Ahmed Abderrazzak Abdelkrim Soumia Djelad Amal Hachemaoui Mohammed Zaoui Farouk Bengueddach Abdelkader Sassi Mohamed 《Journal of Inorganic and Organometallic Polymers and Materials》2022,32(7):2615-2633
Journal of Inorganic and Organometallic Polymers and Materials - The discharge of industrial waste comprising organic pollutants into aquatic environment induces numerous health risks. Crosslinked... 相似文献
5.
Medjahed Sidali Kheloufi Abdelkrim Bobocioiu Ema Kefaifi Aissa Kerkar Fouad Lebbou Kheirreddine 《SILICON》2022,14(1):87-97
Silicon - In this work the reverse flotation as beneficiation process for high-purity silica valorization from Draissa quartz deposits (Algeria) is studied as a potential raw material for... 相似文献
6.
Mohamed Nadjib Boukhatem Abdelkrim Kameli Mohamed Amine Ferhat Fairouz Saidi Khadidja Tayebi 《Journal für Verbraucherschutz und Lebensmittelsicherheit》2014,9(1):13-21
Several essential oils of medicinal plants possess proven antimicrobial activity and are suitable for applications on the food industry. The oil from Cymbopogon citratus (lemongrass) has been reported to have a wide range of biological activities. However, there are few controlled studies confirming its antimicrobial activity. The aim of our study was to assess the antimicrobial potential of lemongrass oil against a wide spectrum of food spoilage and pathogenic bacteria and yeast in liquid and vapour phase. The chemical composition of the oil was analyzed by gas chromatography; 14 components were identified and geranial (28.93 %), neral (24.30 %) and myrcene (23.92 %) were the most abundant constituents. Lemongrass oil showed potent antimicrobial activity against Gram positive bacteria and exhibited the strongest antifungal effect against Candida albicans and C. parapsilosis. Minimum inhibitory concentration varied from 0.019 to 1.25 mg mL?1 for Gram positive bacteria and yeasts, indicating Staphylococcus aureus, S. epidermidis and C. albicans as the most susceptible strains. Moreover, the diameter of inhibition zone (DIZ) increased with increasing essential oil (EO) volume. Considerably superior antimicrobial activity was observed in the vapour phase. The DIZ resulting from the exposure to EO vapour was significantly larger than that from the same volume in the liquid phase. The DIZ varied from 22 to 90 mm for Candida strains. There is growing evidence that EO in vapour phase are effective antimicrobial systems and that they do have advantages over the use of oil in liquid phase. Our results imply that lemongrass oil could be useful for the development of novel types of natural preservatives for food control. 相似文献
7.
8.
Class D amplifier for a power piezoelectric load 总被引:1,自引:0,他引:1
Agbossou K Dion JL Carignan S Abdelkrim M Cheriti A 《IEEE transactions on ultrasonics, ferroelectrics, and frequency control》2000,47(4):1036-1041
We present a high efficiency inverter (>90%) that can drive an acoustic cavitation reactor with a 2 kW power between 10 and 100 kHz. This reactor is composed of numerous piezoelectric transducers and is particularly used to accelerate various industrial chemical reactions and destroy a variety of organic contaminants in water. The class-D amplifier or inverter is composed of power MOSFETs, type IRFP460, in a full bridge configuration driven by IR2110 circuits in bootstrap mode. The specific nature of the problem comes from the fact that, at frequencies slightly different from a resonant frequency frn, the load is mostly capacitive. The insertion of an appropriate low-pass filter in front of the load allowed an efficient solution to the problem due to the load being capacitive for harmonics. The realized system can provide nearly 2 kW to this type of piezoelectric load, with an efficiency of more than 95% 相似文献
9.
A comprehensive model based on a new approach was developed to simulate the duckweed growth under controlled conditions. Contrary to other approaches which use the specific growth rate, this approach uses the intrinsic growth rate which permits to differentiate the effect of duckweed mat density from that of temperature, photoperiod and phosphorus-nitrogen concentrations. The model was calibrated using data from laboratory experiments carried out during the present study and validated using other data from two literature sources. In both cases, the results demonstrated that the model was capable of predicting duckweed growth with a reliability of 95%. 相似文献
10.
Wiem Jebri Jemai Houssem Jerbi Mohamed Naceur Abdelkrim 《International Journal of Control, Automation and Systems》2011,9(3):566-573
The objective of this paper is to simplify the complexity of practical implementation of the input-state feedback linearization
technique for the control of input-affine systems. A polynomial approach which makes use of the Taylor series expansion and
the Kronecker product is developed. Our work aims to address the problem of synthesizing a polynomial control via a nonlinear
analytical coordinates transformation. To check the effectiveness of the investigated approach, we consider the control problem
of a series DC motor. A comparative study with the input-state feedback linearization control is developed. 相似文献