Output Power

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1 - Investigating variations of the electron beam voltage on the traveling wave tube output power in the different frequencies
F. Sheykhe Sh. Saviz M. Salem

10.1007/s40094-018-0292-1

AbstractIn the present research, the effect of variations of the electron beam voltage on the output power is studied. In order to develop the study, this problem was investigated at different frequencies, which are the products of nonlinear behavior of the traveling wa أکثر

AbstractIn the present research, the effect of variations of the electron beam voltage on the output power is studied. In order to develop the study, this problem was investigated at different frequencies, which are the products of nonlinear behavior of the traveling wave tube (TWT) in response to the input frequency. Moreover, for a more realistic understanding, the tubes were considered with two linear and nonlinear responses to the input frequency. The TWT output power was calculated in linear and nonlinear modes, at different frequencies using the numerical solution of the mathematical equations of the Lagrangian model. Then, the output power in terms of distance and beam voltage in different frequencies was plotted and compared. The results revealed that the effects of variations of voltage on the output power were more proper in a single-mode TWT in comparison with a multimode one. تفاصيل المقالة

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2 - شبیه سازی توأمان راکتور گازی سازی و سیکل بخار نیروگاه زباله سوز تهران
میلاد بنائی غلامرضا صالحی

10.22034/jest.2020.38019.4394

زمینه و هدف: هدف این مقاله، شبیه سازی توأمان راکتور گازی ساز و سیکل بخار نیروگاه زباله سوز تهران، به منظور دستیابی و شناسایی پارامترهای تأثیر گذار بر راندمان و توان خروجی نیروگاه می باشد. اطلاعات بدست آمده از طریق این شبیه سازی علاوه بر اینکه می تواند جهت افزایش بهره ور أکثر

زمینه و هدف: هدف این مقاله، شبیه سازی توأمان راکتور گازی ساز و سیکل بخار نیروگاه زباله سوز تهران، به منظور دستیابی و شناسایی پارامترهای تأثیر گذار بر راندمان و توان خروجی نیروگاه می باشد. اطلاعات بدست آمده از طریق این شبیه سازی علاوه بر اینکه می تواند جهت افزایش بهره وری و راندمان نیروگاه زباله سوز تهران مورد استفاده قرار گیرد، می تواند به عنوان اطلاعاتی ارزشمند در سایر نیروگاه های زباله سوز در دست اجرای کشور نیز به کار گرفته شود. روش بررسی: به کمک اطلاعات بدست آمده از نمودار فرآیند جریانی و شرایط عملکردی نیروگاه زباله سوز تهران و آنالیز موجود از ترکیب زباله های شهر تهران، شبیه سازی توأمان بخش گازی سازی و سیکل بخار این نیروگاه توسط نرم افزارAspen plus صورت پذیرفت. گام به گام نتایج حاصل از شبیه سازی با شرایط عملکردی نیروگاه و اطلاعات تجربی به دست آمده از از فرآیند گازی سازی در مقالات پایه مورد صحت سنجی قرار گرفت. یافته ها: توان تولیدی نیروگاه به میزان زیادی تحت تاثیر میزان رطوبت زباله های ورودی و همچنین نوع زباله های ورودی است. در صورتی که بتوان میزان رطوبت پسماند ورودی به نیروگاه را حداقل به میزان 10% کاهش داد، توان خروجی نیروگاه به میزان حدود 30 % افزایش خواهد یافت. همچنین بررسی های صورت پذیرفته نشان می دهد افزایش میزان چوب و زباله های سبزدر ترکیب زباله های ورودی به نیروگاه سبب کاهش راندمان و توان تولیدی نیروگاه می شود. بحث و نتیجه گیری: شبیه سازی صورت پذیرفته نشان می دهد، درصد بالای ترکیبات دارای چوب و زباله های سبز در پسماند ورودی سبب کاهش توان خروجی نیروگاه می شود. لذا اجرای تمهیدات لازم در خصوص کاهش میزان رطوبت زباله های ورودی و همچنین دستیابی به ترکیبی دارای کمترین میزان چوب و زباله های سبز موجب بهره وری و افزایش توان خروجی نیروگاه می شود. تفاصيل المقالة

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3 - Simulation and fabrication of 3.5W 8.8-9.2 GHz power amplifier
mehdi Forouzanfar

This paper presents different steps of simulation and fabrication of a power amplifier, which was realized using a discrete GaN HEMT transistor in the frequency range of 8.8-9.2 GHz. The required wire bonds and matching circuits were characterized using three-dimensiona أکثر

This paper presents different steps of simulation and fabrication of a power amplifier, which was realized using a discrete GaN HEMT transistor in the frequency range of 8.8-9.2 GHz. The required wire bonds and matching circuits were characterized using three-dimensional simulations in HFSS and Momentum ADS software. The fabricated power amplifier provides an output power of 3.5W and a power gain of 13 dB. تفاصيل المقالة

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4 - Design and Simulation of Wideband High-Efficiency X-band MMIC Power Amplifier based on GaN HEMT Technology
Reza Sahragard shahrakht Mehdi Forouzanfar Abolfazl Bijari

10.30486/mjtd.2023.1976574.1007

High output power, good efficiency, sufficient power gain, compact size, and low cost are essential parameters of high-frequency integrated microwave power amplifiers. Due to its unique characteristics, gallium nitride is considered a good choice for realizing high-freq أکثر

High output power, good efficiency, sufficient power gain, compact size, and low cost are essential parameters of high-frequency integrated microwave power amplifiers. Due to its unique characteristics, gallium nitride is considered a good choice for realizing high-frequency power amplifiers. This article presents an integrated microwave power amplifier with high efficiency and wide bandwidth in 0.25 μm GaN technology. Input and output matching networks are realized using spiral inductors, on-chip resistors, on-chip capacitors, and appropriate transmission line structures. The optimal values of the elements have been determined using the random and hybrid optimizer in the ADS simulator. Large on-chip inductors in the drain and gate bias circuits were used for biasing. They were designed in such a way that no ac signal leaks into the bias circuit. The proposed circuit works at 6.8 GHz to 11 GHz frequency, while its maximum PAE is 60%. The small signal gain at the frequency of 9.8 GHz is 12.45 dB, whereas the saturated output power is 32.68 dBm. تفاصيل المقالة

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5 - Effect of Absorption Coefficients in Upper Efficiency Limit of Intermediate Band Solar Cells
Mohammad Ershadi

10.30486/mjtd.2023.1995785.1051

In this paper the idea of an intermediate band solar cell which increases the efficiency of solar cells is considered. By using quantum dots the idea of intermediate band solar cell can be achieved in acceptable level. Actual results of using quantum dots have been led أکثر

In this paper the idea of an intermediate band solar cell which increases the efficiency of solar cells is considered. By using quantum dots the idea of intermediate band solar cell can be achieved in acceptable level. Actual results of using quantum dots have been led to decrease efficiency of solar cell. The effect of absorption coefficients on upper limit of efficiency in special type of solar cell is focus in this paper the main factors which have most impact on the upper limit of efficiency of our position of intermediate bands and consequently the structure of quantum dots. Furthermore, the changes in cell characteristics, quantum dots type, quantum dots structure, and even polarization of the incident light can change the upper limit of efficiency. Changes distances layers of quantum dots create different results for different polarization of light for upper limit of efficiency. Using the results of this research can be a way to new research in the field of solar cells with quantum dots and the optimum use of solar cells will be useful. تفاصيل المقالة

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6 - A review study of some optical characteristics of superluminescent light emitting diode
Hassan Absalan

In this paper, some optical characteristics of superluminescent light emitting diode (SLED) have been studied. The output power of SLED has been described by assuming a uniform carrier density distribution and zero reflection from the faces. In SLEDs, the the total opti أکثر

In this paper, some optical characteristics of superluminescent light emitting diode (SLED) have been studied. The output power of SLED has been described by assuming a uniform carrier density distribution and zero reflection from the faces. In SLEDs, the the total optical power depends on the drive current and the output intensity, does not exhibit a sharp threshold. Typical values for SLED modules are for the optical bandwidth between 5 nm and 100 nm with central wavelengths covering the range between 400 nm and 1700 nm. The structure and the material composition used for the SLED chip affect the gain. تفاصيل المقالة

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7 - Simulation of a PV Connected to an Electrical Energy Distribution Network with Internal Current Loop Control and Voltage Regulator
Seyed Mahdi Behinnezhad Ghazanfar Shahgholian Bahador Fani

10.30495/ijsee.2021.685745

In this paper, a control method based on internal current control loop and dc link voltage regulator for three-phase photovoltaic (PV) system connected to the distribution network is presented. Current control method, the dynamics of the PV system separate it from the d أکثر

In this paper, a control method based on internal current control loop and dc link voltage regulator for three-phase photovoltaic (PV) system connected to the distribution network is presented. Current control method, the dynamics of the PV system separate it from the dynamics of the grid and the loads in it, and dc link voltage control improves control and increases the output power of the PV system. Also, a feedback control method is proposed to adjust the dc link voltage in order to improve the transient response of the PV system, which distinguishes the dynamics of the PV system from the nonlinear characteristics of solar cells and enables the design and optimization of system controllers in a wider range of workstations. In order to achieve a constant voltage level, a dc/dc converter is recommended to prevent the transfer of voltage harmonics to the inverter. The proposed method is investigated using a simulation of a PV system connected to the distribution network in the MATLAB software environment. تفاصيل المقالة

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8 - Computational fluid dynamics analysis and geometric optimization of solar chimney power plants by using of genetic algorithm
Amir Karami Davood Toghraie

In this paper, a multi-objective optimization method is implemented by using of genetic algorithm techniques in order to determine optimum configuration of solar chimney power plant. The objective function which is simultaneously considered in the analysis is output pow أکثر

In this paper, a multi-objective optimization method is implemented by using of genetic algorithm techniques in order to determine optimum configuration of solar chimney power plant. The objective function which is simultaneously considered in the analysis is output power of the plant. Output power of the system is maximized. Design parameters of the considered plant include collector radius (Rc), collector height (Hc), chimney height (Ht), chimney radius (Rt) and heat flux ( ). The multi-objective optimization results show that there are a strong positive correlation between the chimney height and the output power, as well as a negative correlation between the solar collector radius and the output power. Also, it was concluded that, output power of the plant could be considerably increased with increasing solar chimney height while increasing collector radius could slightly reduce output power This study may be useful for the preliminary estimation of power plant performance and the power-regulating strategy option for solar chimney turbines. تفاصيل المقالة

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