86,622 research outputs found
Three stage ku band low noise amplifier at 16 ghz
No full textIn order to design an amplifier at a certain frequency, the gain and noise figure needs to be decided on the basis of the market research. After deciding these three values, a transistor was selected such that it helped to achieve these values. The formulas used in the design process determined the number of stages required to complete the design and to measure the performance of the amplifier. After reviewing more than fifty transistors, the transistor FHX13/14LG was decided for the design of Low Noise Amplifier in the Ku Band at 16 GHz. The design objective was to achieve 40 dB gain with a noise figure of less than 1dB at the specified frequency. After the preliminary calculations, it was concluded that there will be three stages based on the selected transistor. The finalization of each stage was a challenge because of the trade-off issues in gain and noise figure. In order to verify the results, National Instruments Microwave Office (student version) was used for simulation. It gave the simulation values which were very close to the hand calculations. This was also verified using MATLAB along-with an RF/MW E-Book Software* software developed by Dr. Matthew Radmanesh with his published book "Advanced RF & Microwave Circuit Design" for accuracy.Includes bibliographical references (pages 63-63)California State University, Northridge. Department of Electrical and Computer Engineering
Optical 4-F system simulation and spatial filtering
No full textIn this project, optical spatial filtering is designed by using 2-f and 4-f optical imaging systems utilizing Fourier optics approach. The optical 4-f system consists of two 2-f subsystems. The first 2-f subsystem performs a Fourier transform of the object. The Fourier image of the object in the first subsystem is obtained in the Fourier plane. The second 2-f subsystem performs inverse Fourier transform of the Fourier image. The reconstructed image is obtained on the second Fourier plane (image plane). The following are the components of the optical 4-f system (See more in text.
12ghz two-stage power amplifier
No full textThe aim of this project is the design of an RF microwave power amplifier at 12GHz frequency. It is designed by using matching network technique and amplifier's design methodologies. In this project, we discussed the design of "12GHz two-stage power amplifier". The specifications of this amplifier are: a.) A gain of 13.20dB and b.) An output power of 28dBm at 12GHz operating frequency. The transistor, MGF4841AL from MITSUBISHI ELECTRIC was selected such that it could satisfy the design goals. Proper biasing was done in order to obtain the needed S-parameters. For this purpose, the amplifier uses a DC power source of 8.0V. Here, we have designed class A amplifier. The first step of this project was to check the stability.Then, we determined the matching networks. Smith charts were used in order to design the accurate matching network. The circuit schematic, layout were done using agilient Advanced Design System(ADS). ADS software is used for circuit simulation. It is the powerful software for agilient technologies which is usually used by RF microwave industries. This report also includes the stability and gain calculations. The RF microwave design interactive tool from the book "RF and Microwave Electronic illustrated" by Dr. Matthew M. Radmanesh was very helpful for this calculation. The simulation results showed that the designed amplifier met our performance requirements.California State University, Northridge. Department of Electrical and Computer Engineering.Includes bibliographical references (pages 56-56
Design Of Two Stage Microwave Amplifier At 10 Ghz
No full textThis project is to design a two stage microwave amplifier with an overall gain of 29 dB and an overall noise figure less than or equal to 1 dB. The two stage microwave amplifier design consists of a Minimum Noise Amplifier Stage (MNA) followed by a Maximum Gain Amplifier Stage (MGA). For the amplifier design, I have used the RFMW essentials software which is provided by my professor Matthew M. Radmanesh, which helps to calculate the baseline solution, which is later used to design the two stage amplifier. Along with that I have used Agilent Technologies'Advanced Design System Software (ADS)' to design the amplifier and also to calculate the required values for impedance matching. I have performed the simulations for the two stage amplifier design. I have used the transistor NE 3210S01 from NEC vendor for the two stage amplifier design. After transistor selection, I have calculated the DC biasing circuit for the two stage amplifier design. Then each stage is calculated using the ADS software and the results are displayed in the report individually for minimum noise stage and maximum gain stage. Then I have cascaded the two circuits and have achieved the overall gain of the project as 28.3dB and an overall noise figure of 0.8dB. Along with that VSWR, overall noise, S-parameter sweep and power gain simulation results of two stage amplifier design is simulated and the results are displayed.California State University, Northridge. Department of Electrical and Computer Engineering.Includes bibliographical references (pages 65-65
Optical 4-F system simulation and spatial filtering
No full textIn this project, optical spatial filtering is designed by using 2-f and 4-f optical imaging systems utilizing Fourier optics approach. The optical 4-f system consists of two 2-f subsystems. The first 2-f subsystem performs a Fourier transform of the object. The Fourier image of the object in the first subsystem is obtained in the Fourier plane. The second 2-f subsystem performs inverse Fourier transform of the Fourier image. The reconstructed image is obtained on the second Fourier plane (image plane). The following are the components of the optical 4-f system (See more in text.)Includes bibliographical references (leaf 37)California State University, Northridge. Department of Engineering
Variations on the Author
No full text“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
[Newspaper Clipping: Author Claims Evidence of Second JFK Assassin #1]
No full textNewspaper article titled "Author Claims Evidence of Second JFK Assassin." The article states that author Richard J. Whalen concluded "that there is circumstantial evidence to support the theory of a second assassin in the shooting of President John F. Kennedy.
Also By The Same Author: AKTiveAuthor, a Citation Graph Approach to Name Disambiguation
No full textThe desire for definitive data and the semantic web drive for inference over heterogeneous data sources requires co-reference resolution to be performed on those data. In particular, name disambiguation is required to allow accurate publication lists, citation counts and impact measures to be determined. This paper describes a graph-based approach to author disambiguation on large-scale citation networks. Using self-citation, co-authorship and document source analyses, AKTiveAuthor clusters papers, achieving precision of 0.997 and recall of 0.818 over a test group of eight surname clusters
John F. Kennedy telegram to Roosevelt
No full textJersey Homesteads (later the Borough of Roosevelt) was established in the 1930s as an agro-industrial cooperative community. It was established specifically for urban Jewish garment workers, many of whom had emigrated from Europe. President John F. Kennedy sent a telegram to the citizens of Roosevelt, New Jersey, apologizing for not being able to attend the memorial dedication in honor of former President Franklin Delano Roosevelt. (Jersey Homesteads became Roosevelt in 1945 in honor of the president.) President Kennedy expressed his gratitude to the people of Roosevelt for constructing the memorial, and commented that it will serve as a constant reminder of Roosevelt's good works
Logarithmic variance profiles and the corresponding f-1 spectra of temperature fluctuations in turbulent Rayleigh-Bénard convection
No full textWe report experimental results for the temperature variance 2(z) and the corresponding frequency spectra P(f) in turbulent Rayleigh-Bénard convection (RBC) in a cylindrical sample of aspect ratioT= D/L = 1:00 (D = 1:12 m is the diameter and L = 1:12 m the height). The measurements were conducted in the Rayleigh-number range 1011 < Ra < 1:35 1014 and Pr ' 0:8. For Ra = 1:35x1014, 2(z) could be described well by a logarithmic dependence on the vertical position z in a range of z 1 < z < z 2 with z 1 ' 70 and z 2 = 0:1L. Here L=(2Nu) is the thickness of a thin thermal sublayer adjacent to the horizontal plate where the heat flux (denoted by the Nusselt number Nu) is carried mostly by thermal diffusion. In the log layer, we found that the temperature spectra had a significant frequency range over which P(f) f with close to 1. As Ra decreased, increased so that the log layer became thinner. At Ra = 2:05 1011, z 2 < z 1 and therefore there was no range for a log layer. Correspondingly, the temperature spectrum near the horizontal plate did not have the f1 scaling form either
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