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排序方式: 共有346条查询结果,搜索用时 31 毫秒
261.
Mokhtar Mohamed Xing-Gang Yan Zehui Mao Bin Jiang 《International Journal of Adaptive Control and Signal Processing》2020,34(11):1559-1571
In this article, a class of nonlinear interconnected systems with uncertain time varying parameters (TVPs) is considered. Both the interconnections and the isolated subsystems are nonlinear. The differences between the unknown TVPs and their corresponding nominal values are assumed to be bounded where the nominal value is not required to be known. A dynamical system is proposed and then, the error systems between the original interconnected system and the designed dynamical system are analysed. A set of conditions is developed such that the augmented systems formed by the error dynamical systems and the designed adaptive laws are uniformly ultimately bounded. Specifically, the state observation errors are asymptotically convergent to zero based on the LaSalle's Theorem while the parameter estimation errors are uniformly ultimately bounded, and the classical condition of persistent excitation is not required. A case study on a coupled inverted pendulum system is presented to demonstrate the developed methodology, and simulation shows that the proposed approach is effective and practicable. 相似文献
262.
Mohammadi Mokhtar Ali Khan Nabeel Pouyan Ali Akbar 《Multidimensional Systems and Signal Processing》2018,29(4):1661-1678
Multidimensional Systems and Signal Processing - Electroencephalogram (EEG) signals can be used by a proficient neurologist to detect the presence of seizure activity inside the brain. Automated... 相似文献
263.
Antioxidant and hepatoprotective effects of Asparagus albus leaves in carbon tetrachloride‐induced liver injury rats 下载免费PDF全文
264.
S.B. Ahmad Anas M.K. Abdullah M. Mokhtar S.A. Aljunid S.D. Walker 《Optical Fiber Technology》2009,15(1):26-32
We have implemented a new service differentiation technique in the optical domain using a spectral-amplitude-coding (SAC) variant of optical code division multiple access (OCDMA). The newly developed code, named KS (Khazani–Syed) is compared mathematically with other codes which use similar techniques. In our proposal, multiple weights are used to support ‘triple-play’ services (audio, video and data) with different quality-of-service (QoS) requirements. The results characterizing the bit-error-rate (BER) with respect to the total number of active users show that KS offers a significantly improved performance over the previous reported techniques by accommodating additional 30 users with shorter code length and smaller code weight at BER of 10?9. In variable weight system, we have shown that KS codes with larger weight always have the best performance when other users of different weights are present in the system. 相似文献
265.
Amin Malekmohammadi Ghafour Amouzad Mahdiraji Ahmad Fauzi Abas Mohamad Khazani Abdullah Makhfudzah Mokhtar Mohd Fadlee A. Rasid 《Optical Fiber Technology》2009,15(4):337-343
An electrical multiplexing technique, namely Absolute Polar Duty Cycle Division Multiplexing (AP-DCDM) is reported for high-speed optical fiber communication systems. It is demonstrated that 40 Gb/s (4 × 10 Gb/s) AP-DCDM system shows a clear advantage over conventional 40 Gb/s RZ-OOK with 50% duty cycle in terms of dispersion tolerance and spectral efficiency. At 40 Gb/s its tolerance to chromatic dispersion (CD) is 124 ps/nm and 194 ps/nm for the worst and the best user, respectively. These values are higher than that of 40 Gb/s RZ-OOK, which is around 100 ps/nm. The spectral efficiency, receiver sensitivity and OSNR for different number of channels are discussed. Comparison against other modulation formats namely duobinary, Non-Return-to-Zero (NRZ)-OOK and RZ-Differential Quadrature Phase-Shift Keying (RZ-DQPSK) at 40 Gb/s are made. It is shown that AP-DCDM has the best receiver sensitivity (−32 dBm) and better CD tolerance (±200 ps/nm) than NRZ-OOK and RZ-DQPSK. In reference to duobinary, AP-DCDM has better receiver sensitivity but worse dispersion tolerance. 相似文献
266.
Siti Musliha Ajmal Mokhtar Eva Alvarez de Eulate Vithyasaahar Sethumadhavan Miko Yamada Tarl W. Prow Drew R. Evans 《应用聚合物科学杂志》2021,138(44):51314
Conducting polymers are promising candidates for wearable devices due to mechanical flexibility combined with electroactivity. While electrochemical measurements have been adopted as a central transduction method in many on-skin sensors, less studied is the stability of the active materials (in particular poly3,4-ethylenedioxythiophene, PEDOT) in such systems, particularly for “on-skin” applications. In this study, several different variants of doped PEDOT are fabricated and characterized in terms of their (electrical, physical, and chemical) stability in biological fluid. PEDOT doped with tosylate (TOS) or polystyrenesulfonate (PSS) are selected as prototypical forms of conducting polymers. These are compared with a new variant of PEDOT co-doped with both TOS and PSS. Artificial interstitial fluid (aISF) loaded with 1% wt/vol bovine serum albumin is adopted as the testing medium to demonstrate the stability in dermal applications (i.e., conducting polymer microneedles or coatings on microneedles). A range of techniques such as cyclic voltammetry and electrochemical impedance spectroscopy are used to qualify and quantify the stability of the doped conducting polymers. Furthermore, this study is extended by using human skin lysate in the aISF to demonstrate proof-of-concept for stable use of PEDOT in wearable “on-skin” electronics. 相似文献
267.
Hassan Mona Bakri Alsharif Sameer Alhumyani Hesham Ali Elmustafa Sayed Mokhtar Rania A. Saeed Rashid A. 《Wireless Personal Communications》2021,120(3):2387-2387
Wireless Personal Communications - There were errors in the first and fourth authors' names in the initial online publication. The original article has been corrected. 相似文献
268.
Consumer discrimination of Chemlali and Arbequina olive oil cultivars according to their cultivar,geographical origin,and processing system 下载免费PDF全文
Kaouther Ben Hassine Milad El Riachy Amani Taamalli Dhafer Malouche Mohamed Ayadi Khouloud Talmoudi Maroua Aouini Yosra Jlassi Cinzia Benincasa Elvira Romano Enzo Perri Apostolos Kiristakis Mokhtar Hamdi Naziha Grati‐Kammoun Mohamed Hammami 《European Journal of Lipid Science and Technology》2014,116(7):812-824
269.
More Relaxed Non‐Quadratic Stabilization Conditions Using Ts Open Loop System and Control Law Properties 下载免费PDF全文
This paper proposes more relaxed stabilization conditions based on a non‐quadratic Lyapunov function (NQLF) and parallel distributed compensator (PDC) controller. The conditions are derived in terms of linear matrix inequalities (LMIs) by introducing three slack matrices based on the properties of TS membership functions, an open loop system and a PDC controller. These slack matrices are utilized to decouple the LMI variables from the TS system and the input matrices. Therefore, the proposed approach greatly reduces the number of LMI conditions and improves feasibility by providing more degrees of freedom compared to recently published studies. Moreover, local stability and stabilization conditions are considered to handle the time derivatives of membership functions appearing in the stabilization synthesis of the TS closed‐loop system with PDC controller. Finally, several examples are presented to demonstrate the advantages of the proposed approaches. 相似文献
270.