127 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
sj-docx-1-jcn-10.1177_08830738211045234 - Supplemental material for Neuroimaging Features of Intracranial Hypertension in Pediatric Patients With New-Onset Idiopathic Seizures, a Comparison With Patients with Confirmed Diagnosis of Idiopathic Intracranial Hypertension: A Preliminary Study
No full textSupplemental material, sj-docx-1-jcn-10.1177_08830738211045234 for Neuroimaging Features of Intracranial Hypertension in Pediatric Patients With New-Onset Idiopathic Seizures, a Comparison With Patients with Confirmed Diagnosis of Idiopathic Intracranial Hypertension: A Preliminary Study by Arash Kamali, Azin Aein, Niyousha Naderi, Sally J. Choi, Nathan Doyle, Ian J. Butler, Thierry A.G.M. Huisman, Eliana E. Bonfante, Nasim Sheikh-Bahaei, Shekhar Khanpara, Rajan P. Patel, Roy F. Riascos, Xu Zhang, Rosa A. Tang and Alireza Radmanesh in Journal of Child Neurology</p
Analytic model for barrier height enhancement of the Silicon Carbide Schottky diode using low energy ion implantation
No full textThis paper d?s?rib?s ?n ?n?l?ti? d?sign f?r th? b?rri?r h?ight ?nh?n??m?nt ?f th? ??h?ttk? b?rri?r di?d? wh?r? th? m?t?l n? s?mi??ndu?t?r (?r m?t?l ?-n s?mi??ndu?t?r) h?s b??n d?riv?d b? ??nsid?ring th? im?l?nt?d ?r?fil? ?f th? G?ussi?n t??? in th? surf???-d???d l???r ?nd th? surf??? ?r???rti?s ?f the m?t?l-s?mi??ndu?t?r s?st?m. An analyitical model has b??n developed by incorporating the silicon carbide Schottky barrier diodes with l?w ?n?rg? (15k?V) ?rs?ni? im?l?nt?ti?n. It is sh?wn th?t th? b?rri?r h?ight ?nh?n??m?nt ?f th? f?bri??t?d ??h?ttk? b?rri?r di?d?s ?s ? fun?ti?n ?f i?n d?s? is in g??d ?gr??m?nt with th? experiment results elsewhere.California State University, Northridge. Department of Electrical and Computer Engineering.Includes bibliographical references (pages 49-54
8 to 16 GHz Broadband Amplifier design using Balanced Configuration
No full textThis report illustrates the design of a Balanced Broadband Amplifier using Lange Couplers. The Broadband Amplifier operates at an octave of 8 GHz to 16 GHz with center frequency at 12 GHz. After reviewing multiple datasheets, the transistor NE3210S01 (by California Eastern Laboratories) which is a pseudomorphic Hetro-Junction FET providing high stable gain (13.5 dB) and a low noise figure (F = 0.35 dB typ) was selected. The Balanced configuration two Maximum Gain Amplifiers designed at center frequency connected in parallel. The MGA helped us achieve the maximum gain provided by the transistor. The Matching Network designed stabilize the gain at the output. The calculations were verified using MATLAB and Excel based RF-MW Design software. The verified calculations were simulated in AWR Microwave Office and the final design layout of the complete design including the DC bias circuitry was sketched.Includes bibliographical references (pages 40-40)California State University, Northridge. Department of Electrical and Computer Engineering
Compte-rendu du séminaire du 3 décembre 2012
No full textarabe 3467 f.28v Compte-rendu du séminaire du 3 décembre 2012. Etaient présents : Annie Vernay-Nouri (AVN), Eloïse Brac-de-la-Perrière (EBP), Suzanne Babey (SB), Frantz Chaigne (FC), Zina Cohen (ZC), Maxime Durocher (MD), Ghazaleh Esmailpour (GE), Isabelle Imbert (II), Aïda el-Khiari (AK), Hana Mater (AM), Farshad Radmanesh (FR), Lucie Robert (LR) et Yi Zhai (YZ). Tour de table: - AK centralisera toute la bibliographie concernant Kalîla wa Dimna. Les ouvrages collationnés pourront traiter ta..
Hepatic and Renal Function Tests and Routine Hematological Markers in Patients with Cerebrovascular Accident and Transient Ischemic Attack
No full textBackground and Aim: Cerebrovascular accident (CVA), also known as stroke, is a vascular syndrome that is the second leading cause of death in the world after ischemic heart disease. Transient ischemic attacks (TIAs) is a warning sign for CVA so that 20% of patients with TIA experience a subsequent stroke within 90 days. Hence, identification of laboratory markers is crucial for the prognosis and diagnosis of patients with CVA and TIA. Changes in some laboratory markers occur in patients with CVA and TIA. Thus, the present study aimed to evaluate hepatic and renal function tests and routine hematological markers in patients with CVA and TIA.
Methods: The present study was a cross - sectional analytical study. The study population was patients with CVA and TIA who were hospitalized in Abadan and Khorramshahr educational hospitals from March 21, 2019, to March 19, 2020. One hundred patients with CVA and one hundred patients with TIA were randomly selected and the necessary information (age, sex, liver enzymes, renal function tests, FBS, and routing hematologic markers including CBC, ESR, PT and PTT) of the patients was collected from HIS (Hospital Information System) of Abadan and Khorramshahr educational hospitals. Liver, kidney and hematologic diagnostic markers were evaluated by age and gender. Data analysis was performed using a t -test (to compare gender difference of laboratory markers in CVA and TIA groups) and one-way ANOVA (to compare laboratory markers among age groups of patients with CVA and TIA). Simple linear regression was used to examine the relationships between changes in FBS (mg / dl) and changes in laboratory diagnostic factors.
Results: The results of this study showed that the highest frequency of patients with CVA (n= 130, 27.3%) and TIA (n= 49, 23.8%) was observed in the age group of 55-64 years. The results indicate that the mean level of some laboratory markers such as FBS (CVA: 174.32 ± 105.83; TIA: 150.32 ± 83.32), creatinine (CVA: 1.37 ± 1.32; 1.42 ± 1.09), LDH (CVA: 696.29 ± 344.90; TIA: 538.17 ± 230.76), and ESR (CVA: 52.41 ± 37.61; TIA: 14.00 ± 8.40) was higher than the normal range in both CVA and TIA. The mean of SGOT (34.10 ± 26.40 IU / L) and ALK (331.44 ± 370.78 IU / L) enzymes were higher than normal only in CVA patients and the mean of SGPT (33.08 ± 38.55 IU / L) was higher than normal only in TIA patients. It was also observed that in patients with CVA, with each unit increase in FBS, a significant increase occurs in K+ level (P < 0.001), WBC (P= 0.003), and RBC (P= 0.031) count, as well as a significant decrease in Na+ level (P= 0.008).
Conclusion: The results of the present study showed an increase in the level of FBS, ESR and LDH both in CVA and TIA. While SGOT and ALK increased only in CVA patients, SGPT showed an increase only in TIA patients.
*First Corresponding Author: Esmat Radmanesh; Email: [email protected]; ORCID ID: 0000-0003-1369-6580
Second Corresponding Author: Sahar Golabi; Email: [email protected]
Please cite this article as: Monfared A, Fadavipour M, Golabi S, Kamyari N, Zahedi A, Hazbenejad A, Kanani K, Jelvay S, Tajvidi M, Radmanesh E. Hepatic and Renal Function Tests and Routine Hematological Markers in Patients with Cerebrovascular Accident and Transient Ischemic Attack. Arch Med Lab Sci. 2023;9:1-9 (e3). https://doi.org/10.22037/amls.v9.3925
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