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91.
In this study, a six-lump model was sufficient to describe the kinetics of vacuum gas oil (VGO) hydrocracking in order to maximize the production of middle distillate diesel. The kinetic lump model target was to obtain the reaction rate constants that represent all the hydrocracking reactions in the process. The operating conditions such as temperature, pressure, and hydrogen severity were tested to find the optimum parameters that maximize diesel yields. Mild hydrocracking operating conditions of temperature and pressure were used in a commercial hydrocracker with hydrogen severity similar to hydrotreating processes. The main reaction was the VGO conversion to diesel based on its high reaction rate constant compared with other reactions. In addition, the main reaction had the highest effect on catalyst deactivation based on the resulted deactivation factor. A multi-linear regression correlation was obtained for maximizing diesel production as a function of operating pressure, temperature, and hydrogen amount, keeping the diesel specifications within the market demand. 相似文献
92.
In photovoltaic (PV) applications, a maximum power point tracking (MPPT) module is necessary to extract the whole energy that the PV module can generate depending on the instantaneous conditions of the PV system. A PV module is obtained by connecting a number of solar cells in series and parallel, which causes voltage and current to increase at module terminations. The present work is based on a three-phase grid-connected inverter designed for a 100 kW PV power plant that uses an MPPT scheme based on fuzzy logic controllers. The whole system presented is simulated in MATLAB. The fuzzy logic-based MPPT controllers show accurate and fast responses and are integrated into the inverter, so that the there is no requirement for a dc–dc converter. The inverter allows full control of reactive power. 相似文献
93.
Gas tunnel type plasma spraying deposition has been applied successfully to the deposition of the SiC films on stainless-steel substrates. The microstructure and the surface morphology of the SiC films were characterized by means of X-ray diffraction (XRD) and scanning electron microscope (SEM). The control of the processing parameters such as powder feeding rate, composition of plasma working gases, spraying distance, and carrier gas flow rate allowed the deposition of dense, uniform, continuous, and high purity crystalline SiC films. The thickness of the SiC films varied from 3 to 10 μm. EDS analysis confirmed the presence of SiO2 in the deposited SiC films. 相似文献
94.
The kinetics of the exothermic reaction of acetaldehyde with methyl alcohol has been studied using calorimetry in the temperature range of 263–283 K. Based on this study the reaction rate constant for the reaction was found to be and the heat of reaction was found to be These kinetics were based on the assumption of a pseudoisothermal first-order reaction. 相似文献
95.
Javaid Shumaila Fahim Hamza Hamid Zara Hussain Faisal Bashir 《Multimedia Tools and Applications》2018,77(4):4433-4452
Multimedia Tools and Applications - Wireless multimedia sensor networks (WMSNs) have emerged as a revolutionary technology, that has shifted the focus of low power wireless sensor networks (WSNs).... 相似文献
96.
Al-khafajiy Mohammed Baker Thar Chalmers Carl Asim Muhammad Kolivand Hoshang Fahim Muhammad Waraich Atif 《Multimedia Tools and Applications》2019,78(17):24681-24706
Multimedia Tools and Applications - Due to a rapidly increasing aging population and its associated challenges in health and social care, Ambient Assistive Living has become the focal point for... 相似文献
97.
Mirza Ghulam Fiza Umrani A. W. Jawad Abdul Razzaque Bohra Nafeesa Chowdhry B. S. Umrani Fahim Aziz 《Wireless Personal Communications》2019,106(1):71-83
Wireless Personal Communications - Smog is considered as a serious worldwide problem especially in Asian countries resulting sometimes in fatal injuries. Wireless communication can play a vital... 相似文献
98.
Baqai Attiya Umrani Fahim Aziz Chowdhry Bhawani S. 《Wireless Personal Communications》2017,95(4):4211-4224
Wireless Personal Communications - The wireless body area network (WBAN) has emerged as a new technology for e-healthcare that allows real time monitoring of patients using miniaturized wearable... 相似文献
99.
Plain weave carbon fabric (CF) reinforced Polyetherimide (PEI) composites, hereafter referred to as CF‐PEI composites, containing 40, 55, 65, 75, and 85 vol% of CF were developed using impregnation technique and compression moulding. An additional CF‐PEI composite containing 52 vol% of CF was also fabricated using film technique and compression moulding. These composites were developed in order to explore the effect of fabric content and processing technique on strength properties and erosive wear performance of PEI. These six composites along with unfilled PEI were evaluated for their physical and mechanical properties. The erosive wear performance of these materials was evaluated using angular silica particles as erodent at an impingement angle of 30°. It was observed that fabric content strongly influenced the strength properties as well as erosion resistance. Strength performance, however, did not linearly increase with increase in fabric content. Lowest (40%) and highest (85%) amount of fabric proved least effective in this regard. Similar observations were observed in the case of wear resistance (WR). CF in the range of 55–75 vol% proved optimum for strength properties and wear performance barring PEI, which showed highest WR. Between the two processing techniques, impregnation technique (I) proved far superior to the film technique (F) in both strength and wear performance. A fairly good correlation was observed between erosion resistance and a product of interlaminar shear strength, resilience, and elongation. SEM studies on worn surfaces supported the wear behavior. POLYM. COMPOS., 2008. © 2008 Society of Plastics Engineers 相似文献
100.
Yash A. Kadakia;Fahim Abdullah;Aisha Alnajdi;Panagiotis D. Christofides; 《American Institute of Chemical Engineers》2024,70(9):e18509
This article proposes a two-layer framework to maximize economic performance through dynamic process economics optimization while addressing fluctuating real-world economics and enhancing cyberattack resilience via encryption in the feedback control layer for nonlinear processes. The upper layer employs a Lyapunov-based economic model predictive control scheme, receiving updated economic information for each operating period, while the lower layer utilizes an encrypted linear feedback control system. Encrypted state information is decrypted in the upper layer to determine the economically optimal dynamic operating trajectory through nonlinear optimization. Conversely, the lower layer securely tracks this trajectory in an encrypted space without decryption. To mitigate the cyber vulnerability of the upper layer, we integrate a cyberattack detector that utilizes sensor-derived data for attack detection. We quantify the errors stemming from quantization, disturbances, and sample-and-hold controller implementation. Simulation results of a nonlinear chemical process highlight the robustness and economic benefits of this new control architecture. 相似文献