排序方式: 共有30条查询结果,搜索用时 15 毫秒
1.
Mayyas K. Aboulnasr T. 《Circuits and Systems II: Express Briefs, IEEE Transactions on》2004,51(3):136-142
This paper proposes a new low-complexity transform-domain (TD) adaptive algorithm for acoustic echo cancellation. The algorithm is based on decomposing the long adaptive filter into smaller subfilters and employing the selective coefficient update (SCU) approach in each subfilter to reduce computational complexity. The resulting algorithm combines the fast converging characteristic of the TD decomposition technique and the benefits of the SCU of low complexity with minimal performance losses. The improvement in convergence speed comes at the expense of a corresponding increase in misadjustment. To overcome this problem, a hybrid of the proposed algorithm and the standard TD LMS algorithm (TDLMS) is presented. The hybrid algorithm retains the fast convergence speed capabilities of the original algorithm while allowing for low final MSE. Simulations show that the hybrid algorithm offers a superior performance when compared to the standard TDLMS algorithm with less computational overhead. 相似文献
2.
The potent O-GlcNAcase (OGA) inhibitor GlcNAc-thiazoline has been modified by buffer- or acylation-induced imine-to-enamine conversion and then electrophile or radical addition (Xn = D3, F, N3, OH, SMe, COCF3, CF3). Several functionalized GlcNAc-thiazolines show highly selective inhibition of OGA vs human hexosaminidase and thus have promise as tools for targeted investigations of OGA, an enzyme linked to diabetes and neurodegeneration. A new radical addition/fragmentation reaction of the N-(trifluoroacetyl)enamine has been discovered. 相似文献
3.
Shapsough Salsabeel Takrouri Mohannad Dhaouadi Rached Zualkernan Imran A. 《Wireless Networks》2021,27(6):4313-4329
Wireless Networks - This paper presents a novel IoT-based architecture that utilizes IoT hardware, software, and communication technologies to enable real-time monitoring and management of solar... 相似文献
4.
Yifang Wang Mohannad Mayyas Jiong Yang Jianbo Tang Mohammad B. Ghasemian Jialuo Han Aaron Elbourne Torben Daeneke Richard B. Kaner Kourosh Kalantar-Zadeh 《Advanced functional materials》2021,31(3):2005866
2D transition metal dichalcogenides (TMDs) play increasingly significant roles in research and future optoelectronics. However, the large-scale deposition of 2D TMDs remains challenging due to sparse nucleation and substrate dependency. Liquid metals can offer effective solutions to meet these challenges due to their reactive, non-polarized, and templating properties. Here, self-deposition of 2D molybdenum sulfide is shown by introducing a molybdenum precursor onto the surface of a eutectic alloy of gallium and indium (EGaIn). EGaIn serves as an ultra-smooth template and reducing agent for the precursor to form large-scale planar molybdenum sulfides, which is transferrable to any substrate. The molybdenum sulfides form spontaneously on the surface of EGaIn, which has a sufficient potential to drive the cathodic reactions of the deposition process. A highly crystalline 2H-MoS2 is obtained after a final annealing step. This work demonstrates a fundamentally new capability for the formation of large-scale 2D TMDs. 相似文献
5.
Mohammad B. Ghasemian Mohannad Mayyas Shuhada A. Idrus‐Saidi Muhammad A. Jamal Jiong Yang Sajjad S. Mofarah Esmaeil Adabifiroozjaei Jianbo Tang Nitu Syed Anthony P. O'Mullane Torben Daeneke Kourosh Kalantar‐Zadeh 《Advanced functional materials》2019,29(36)
Liquid metals offer unprecedented chemistry. Here it is shown that they can facilitate self‐limiting oxidation processes on their surfaces, which enables the growth of metal oxides that are atomically thin. This claim is exemplified by creating atomically thin hydrated MnO2 using a Galvanic replacement reaction between permanganate ions and a liquid gallium–indium alloy (EGaIn). The “liquid solution”–“liquid metal” process leads to the reduction of the permanganate ions, resulting in the formation of the oxide monolayer at the interface. It is presented that under mechanical agitation liquid metal droplets are established, and simultaneously, hydrated gallium oxides and manganese oxide sheets delaminate themselves from the interfacial boundaries. The produced nanosheets encapsulate a metallic core, which is found to consist of solid indium only, with the full migration of gallium out of the droplets. This process produces core/shell structures, where the shells are made of stacked atomically thin nanosheets. The obtained core/shell structures are found to be an efficient photocatalyst for the degradation of an organic dye under simulated solar irradiation. This study presents a new research direction toward the modification and functionalization of liquid metals through spontaneous interfacial redox reactions, which has implications for many applications beyond photocatalysis. 相似文献
6.
Leaky LMS algorithm: MSE analysis for Gaussian data 总被引:3,自引:0,他引:3
Despite the widespread usage of the leaky LMS algorithm, there has been no detailed study of its performance. This paper presents an analytical treatment of the mean-square error (MSE) performance for the leaky LMS adaptive algorithm for Gaussian input data. The common independence assumption regarding W(n) and X(n) is also used. Exact expressions that completely characterize the second moment of the coefficient vector and algorithm steady-state excess MSE are developed. Rigorous conditions for MSE convergence are also established. Analytical results are compared with simulation and are shown to agree well 相似文献
7.
Abu-Hamdeh Nidal H. Abusorrah Abdullah M. Bayoumi Mohannad M. Oztop Hakan F. Sun Chuan 《Journal of Thermal Analysis and Calorimetry》2021,144(6):2627-2639
Journal of Thermal Analysis and Calorimetry - The natural convection of the oil-NE-PCM/Al2O3 inside the parabolic trough collector is studied. To simulate nanoencapsulate-phase change material... 相似文献
8.
The synthesis of a variety of pyranose-, nucleoside-, (amino acid)-, and polyhydric-based seleninic and selenonic acids by DMDO oxidation of the corresponding selenoesters is reported, as well as some unusual coupling reactions of the seleninate and selenonate functionality with biological nucleophilic groups (sulfhydryl, indole, phenol, imidazole, carboxamide) that are found in proteins and enzyme active sites. 相似文献
9.
Amjad M. Qandil Aiman A. Obaidat Muaadh A. Mohammed Ali Bashar M. Al-Taani Bassam M. Tashtoush Nawzat D. Al-Jbour Mayyas M. Al Remawi Khaldoun A. Al-Sou’od Adnan A. Badwan 《Journal of solution chemistry》2009,38(6):695-712
Complexation between ibuprofen and low molecular weight chitosan (LMWC) was studied. LMWC was prepared from high molecular
weight chitosan using the acid hydrolysis method. The complexes were investigated by using DSC, FT-IR and liquid-state 1H-NMR. Molecular mechanics (MM) calculations were used to give insight into the stoichiometry of the interaction of chitosan
with ibuprofen. The results showed that complexation of ibuprofen with LMWC involves ionic interaction between the ammonium
group of LMWC and the carboxylate anion of ibuprofen. It was also shown that it is more efficient to prepare the complexes
using lower concentration solutions of the polymer. These results were supported by molecular mechanics calculations. The
experimental results may explain the discrepancies in the literature where, in many studies, the concentration of chitosan
and its low average molecular weight were not considered to be important factors in the complexation process. 相似文献
10.
Ahmed Abdel Aziz Mohannad Elsayed Hassan Abu Bakr Joumana El-Rifai Tom Van der Donck Jean-Pierre Celis Vladimir Leonov Paolo Fiorini Sherif Sedky 《Journal of Electronic Materials》2010,39(9):1920-1925
This article reports on the development of thin films of p- and n-type bismuth telluride compounds which are suitable for microelectromechanical systems (MEMS) thermoelectric energy harvesters.
Films were prepared by the pulsed laser deposition technique. It is shown that the thin films of binary Bi-Te alloys outperformed
considerably their ternary counterparts. Furthermore, the highest thermoelectric figure of merit (ZT) was found to be 0.39 for the p-type Bi32Te68 alloy, whereas the optimal n-type alloy was Bi25Te75, which was characterized by a relatively low stress gradient. 相似文献