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排序方式: 共有138条查询结果,搜索用时 15 毫秒
1.
Lazrak J. El Assiri El. Abdellaoui A. Taleb A. Rais Z. Taleb M. El-Hajjaji F. Salim R. Mabrouki J. Jodeh Shehdeh 《Protection of Metals and Physical Chemistry of Surfaces》2021,57(4):834-848
Protection of Metals and Physical Chemistry of Surfaces - Corrosion inhibition propriety of (2E)-3-phenylprop-2-enal, known as trans-cinnamaldehyde (TCA) for mild steel in 1 M HCl medium was... 相似文献
2.
Taleb Samia Dokhan Nahed Zazi Nacer Chopart Jean-Paul 《Protection of Metals and Physical Chemistry of Surfaces》2019,55(4):781-788
Protection of Metals and Physical Chemistry of Surfaces - In this work the effect of the permanent weak magnetic field on the electrodeposited ZnO nanostructured film on the ITO substrate... 相似文献
3.
Removal of the persistent pollutant chlorobenzene by adsorption onto activated montmorillonite 总被引:1,自引:0,他引:1
The potential of activated bentonite was assessed for adsorption of chlorobenzene from aqueous solution. The bentonite used was treated by chemical and thermal activation over 100–500 °C. The thermal activation increased the adsorption capacity more strongly than chemical activation which consists to acid and hydrogen peroxide treatment. The removal is dominated by adsorption at low initial concentrations and low temperatures and favourable in acidic media. The dependence of the adsorption on pH appears to be related to the solubility of chlorobenzene. Thermodynamic parameters such as ΔH°, ΔS°, ΔG° and Ea have been calculated. The adsorption process is spontaneous and exothermic in nature. The Freundlich isotherm described the adsorption data over the concentration range (20–270 °C). 相似文献
4.
Kamel Benachenhou Mhamed Hamadouche Abdelmalik Taleb‐Ahmed 《International Journal of Satellite Communications and Networking》2017,35(3):215-230
This paper deals with the analysis of the acquisition process performed by a global navigation satellite system (GNSS) receiver with a pilot and data channel or in case of GNSS hybrid receiver. Signal acquisition decides the presence or absence of GNSS signal by comparing signal under test with a fixed threshold and provides a code delay and a Doppler frequency estimation, but in low signal conditions or in a noisy environment; acquisition systems are vulnerable and can give a high false alarm and low detection probability. Firstly, we introduce a cell‐averaging‐constant false alarm rate (CFAR) then a data‐pilot cell‐averaging‐CFAR detector fusion based to deal with these situations. In this context, we use a new mathematical derivation to develop a closed‐form analytic expressions for the probabilities of detection and false alarm. The performances of the proposed detector are evaluated and compared with a non‐CFAR case through an analytical and numerical results validated by Mont Carlo simulations. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献
5.
Design patterns have been introduced as a medium to capture and disseminate the best design knowledge and practices. In the
field of human–computer interaction, practitioners and researchers have explored different avenues to use patterns and pattern
languages as design tools. This paper surveys these avenues—from individual pattern use for solving a specific design problem,
to pattern-oriented design, which guides designers in building a conceptual design by leveraging relationships between patterns.
One of our underlying goals is to investigate how patterns can be used, not only to foster the reuse of proven and valid design
solutions, but also as a central artefact in the process of deriving a design from user experiences and requirements. We will
present our investigations on pattern-based design, and discuss how user experiences can be incorporated in the pattern selection
process through the use of user variables, pattern attributes and associated relationships. 相似文献
6.
Dimensionality and size are two factors that govern the properties of semiconductor nanostructures. In nanocrystals, dimensionality is manifested by the control of shape, which presents a key challenge for synthesis. So far, the growth of rod-shaped nanocrystals using a surfactant-controlled growth mode, has been limited to semiconductors with wurtzite crystal structures, such as CdSe (ref. 3). Here, we report on a general method for the growth of soluble nanorods applied to semiconductors with the zinc-blende cubic lattice structure. InAs quantum rods with controlled lengths and diameters were synthesized using the solution-liquid-solid mechanism with gold nanocrystals as catalysts. This provides an unexpected link between two successful strategies for growing high-quality nanomaterials, the vapour-liquid-solid approach for growing nanowires, and the colloidal approach for synthesizing soluble nanocrystals. The rods exhibit both length- and shape-dependent optical properties, manifested in a red-shift of the bandgap with increased length, and in the observation of polarized emission covering the near-infrared spectral range relevant for telecommunications devices. 相似文献
7.
An adaptive version of the twisting algorithm is proposed, which actually presents a new second-order sliding-mode algorithm. Due to the dynamic adaptation of the gains the controller design does not require complete information on the bounds of uncertainties and perturbations. It automatically decreases the gains and respectively also the dangerous oscillations due to a too large discontinuous-control magnitude. Thus, both the performance and the accuracy of the closed-loop system are improved. In order to show the feasibility of the approach, the methodology is successfully applied to control the position of a pneumatic actuator in an experimental setup. 相似文献
8.
Non-geostationary (NGEO) satellite communication systems are seen as an attractive solution to realize the vision of anywhere, anytime pervasive access to the Internet. Their design and development have thus gained tremendous interest in the last few years. Commencing with a brief overview of general NGEO satellite configurations, this article next addresses the key technical difficulties in the development of NGEO IP-based satellite communications systems. The article discusses routing concerns, mobility management, and transport protocols with an emphasis on TCP performance in NGEO satellite networks. Some key innovations are presented. The recursive, explicit, and fair window adjustment (REFWA) scheme is presented as a solution to improve the efficiency and fairness of TCP in NGEO systems. An improvement to the REFWA scheme, REFWA plus, is also described to combat link errors in satellite environments. 相似文献
9.
10.
B. Zerga A. Attayibat M. Sfaira M. Taleb B. Hammouti M. Ebn Touhami S. Radi Z. Rais 《Journal of Applied Electrochemistry》2010,40(9):1575-1582
The corrosion inhibition of C38 steel in molar HCl by N,N-bis[2-(3,5-dimethyl-1H-pyrazol-1-yl)ethyl]buthylamine (P1) and 5-{N,N-bis[2-(3,5-dimethyl-1H-pyrazol-1-yl)ethyl] amino} pentanol (P2) has been investigated at 308 K using electrochemical and
weight loss measurements. Measurements show that these compounds act as good inhibitors without changing the mechanism of
the corrosion process. Moreover, the inhibiting efficiency increases with the increase in concentration of the studied inhibitors.
Compound P2 showed better protection properties even at relatively higher temperatures when compared to P1. The associated
activation corrosion and free adsorption energies have been determined. P1 and P2 are adsorbed on the C38 steel surface according
to a Langmuir isotherm adsorption model. 相似文献