排序方式: 共有16条查询结果,搜索用时 15 毫秒
1.
Khadiri M. Elyaagoubi M. Idouhli R. Mabrouki M. Abouelfida A. Outzourhit A. 《Journal of Solid State Electrochemistry》2021,25(2):479-487
Journal of Solid State Electrochemistry - Bi2Se3 compound was deposited catholically under potential control, from a mixture solution composed from equimolar SeO2 and BiCl3. The concentration of... 相似文献
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Mbarka Mabrouki Marc Aiguier Jean-Paul Comet Pascale Le Gall Adrien Richard 《Mathematics in Computer Science》2011,5(3):263-288
In the course of understanding biological regulatory networks (BRN), scientists usually start by studying small BRNs that
they believe to be of particular importance to represent a biological function, and then, embed them in a larger network.
Such a reduction can lead to neglect relevant regulations and to study a network whose properties can be very different from
the properties of this network viewed as a part of the whole. In this paper we study, from a logical point of view, on which
conditions concerning both networks, properties can be inherited by BRNs from sub-BRNs. We give some conditions on the nature
of the network embeddings ensuring that dynamic properties on the embedded sub-BRNs are preserved at the level of the whole
BRN. 相似文献
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Mabrouki R Ibrahim Y Xie E Meot-Ner Mautner M El-Shall MS 《The journal of physical chemistry. A》2006,110(23):7334-7344
The binding energies of the first 5 H2O molecules to c-C3H3+ were determined by equilibrium measurements. The measured binding energies of the hydrated clusters of 9-12 kcal/mol are typical of carbon-based CH+...X hydrogen bonds. The ion solvation with the more polar CH3CN molecules results in stronger bonds consistent with the increased ion-dipole interaction. Ab initio calculations show that the lowest energy isomer of the c-C3H3+(H2O)4 cluster consists of a cyclic water tetramer interacting with the c-C3H3+ ion, which suggests the presence of orientational restraint of the water molecules consistent with the observed large entropy loss. The c-C3H3+ ion is deprotonated by 3 or more H2O molecules, driven energetically by the association of the solvent molecules to form strongly hydrogen bonded (H2O)nH+ clusters. The kinetics of the associative proton transfer (APT) reaction C3H3+ + nH2O --> (H2O)nH+ + C3H2* exhibits an unusually steep negative temperature coefficient of k = cT(-63+/-4) (or activation energy of -37 +/- 1 kcal mol(-1)). The behavior of the C3H3+/water system is exactly analogous to the benzene+*/water system, suggesting that the mechanism, kinetics and large negative temperature coefficients may be general to multibody APT reactions. These reactions can become fast at low temperatures, allowing ionized polycyclic aromatics to initiate ice formation in cold astrochemical environments. 相似文献
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A structural study of amphiphilic PAMAM (poly(amido amine)) dendrimers in Langmuir and Langmuir-Blodgett films 总被引:2,自引:0,他引:2
Sui G Mabrouki M Ma Y Micic M Leblanc RM 《Journal of colloid and interface science》2002,250(2):364-370
Two amphiphilic PAMAM dendrimers are synthesized by attaching 12-hydroxydodecanoic acid (HA) chains to a poly(amido amine) (PAMAM) dendrimer core (including generation I and generation II). The limiting molecular area obtained from the surface pressure-area isotherm at the air/water interface suggests the edge-on configuration for both dendrimers in Langmuir films. The edge-on arrangement is also supported by the atomic force microscopic (AFM) studies of the Langmuir-Blodgett films. 相似文献
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Ridha Mabrouki Ryan T. Kelly David C. Prior Alexandre A. Shvartsburg Keqi Tang Richard D. Smith 《Journal of the American Society for Mass Spectrometry》2009,20(9):1768-1774
Differential mobility spectrometry or field asymmetric waveform ion mobility spectrometry (FAIMS) is gaining broad acceptance
for analyses of gas-phase ions, especially in conjunction with largely orthogonal separation methods such as mass spectrometry
(MS) and/or conventional (drift tube) ion mobility spectrometry. In FAIMS, ions are filtered while passing through a gap between
two electrodes that may have planar or curved (in particular, cylindrical) geometry. Despite substantial inherent advantages
of the planar configuration and its near-universal adoption in current stand-alone FAIMS devices, commercial FAIMS/MS systems
have employed curved FAIMS geometries that can be more effectively interfaced to MS. Here we report a new planar (p-) FAIMS
design with slit-shaped entrance and exit apertures that substantially increase ion transmission in and out of the analyzer.
The entrance slit interface effectively couples p-FAIMS to multi-emitter electrospray ionization (ESI) sources, improving
greatly the ion current introduced to the device and allowing liquid flow rates up to ∼50 μL/min. The exit slit interface
increases the transmission of ribbon-shaped ion beams output by the p-FAIMS to downstream stages such as a MS. Overall, the
ion signal in ESI/FAIMS/MS analyses increases by over an order of magnitude without affecting FAIMS resolution. 相似文献
7.
Momoh PO Abrash SA Mabrouki R El-Shall MS 《Journal of the American Chemical Society》2006,128(38):12408-12409
Since the discovery of acetylene and benzene in protoplanetary nebulae under powerful ultraviolet ionizing radiation, efforts have been made to investigate the polymerization of ionized acetylene. Here we report the efficient formation of benzene ions within gas-phase ionized acetylene clusters (C2H2)n+ with n = 3-60. The results from experiments, which use mass-selected ion mobility techniques, indicate that the (C2H2)3+ ion has unusual stability similar to that of the benzene cation; its primary fragment ions are similar to those reported from the benzene cation, and it has a collision cross section of 47.4 A2 in helium at 300 K, similar to the value of 47.9 A2 reported for the benzene cation. In other words, (C2H2)3+ structurally looks like benzene, it has stability similar to that of benzene, it fragments such as benzene, therefore, it must be benzene! 相似文献
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Applications of Mathematics - We consider a model coupling the Darcy equations in a porous medium with the Navier-Stokes equations in the cracks, for which the coupling is provided by the... 相似文献
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Spectral discretization of Darcy equations coupled with Stokes equations by vorticity–velocity–pressure formulations 下载免费PDF全文
Yassine Mabrouki Saloua Mani Aouadi Jamil Satouri 《Numerical Methods for Partial Differential Equations》2017,33(5):1628-1651
We propose to make the numerical analysis of a model coupling the Darcy equations in a porous medium with the Stokes equations in the cracks. The coupling is provided by a pressure continuity on the interface. We describe a discretization by spectral element methods. We derive a priori optimal error estimates and we present some numerical experiments which confirm the results of the analysis.© 2017 Wiley Periodicals, Inc. Numer Methods Partial Differential Eq 33: 1628–1651, 2017 相似文献