James Madison University – ISAT 493 Senior Capstone | Power Line Efficiency Analysis | By Wade Reynolds | | Advisor: Dr. James L. Barnes | Sponsored by Shenandoah Valley Electric Cooperative | | ACKNOWLEDGEMENTS I would like to thank Jason Burch and Myron Rummel for their help and support throughout the duration of the study. Jason’s help proved to be critical in overcoming some of the complex technical challenges associated with the data calculations and solutions. I would
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EXPERIMENTAL DETAILS All chemicals used were Merck reagent grade. Solutions were formulated with chromium sulfate (Cr¬2(SO4)3.6H2O) as chromium source in the quantities presented in (Table 1); Solutions were heated to 60°C for three hours during complexation reaction as in [29]‚ and pH was adjusted to 3 units without HCl or NH3 . Table1- electrolyte and electrodeposition parameter The coatings were deposited on a 1 x 1.5 cm2 cooper plate sample. Preparation for all specimens was as follow: Firstly
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after falling asleep in eight insomniacs (who met DSM-IV criteria for primary insomnia) and eight normal sleepers. Non-invasive measures of heart rate (HR)‚ stroke volume (SV)‚ cardiac output (CO) and pre-ejection period (PEP) were collected by impedance cardiography during a night of polysomnographic recording. Frequency domain measures [low-frequency (LF)‚ high-frequency (HF)] of heart rate variability (HRV) were also estimated. Decrements in HR and CO and increases in SV and HF normalized units
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Ques-1: What is a transformer and how does it work? Ans: A transformer is an electrical apparatus designed to convert alternating current from one voltage to another. It can be designed to “step up” or “step down” voltages and works on the magnetic induction principle. A transformer has no moving parts and is a completely static solid state device‚ which insures‚ under normal operating conditions‚ a long and trouble-free life. Construction of transformer is very simple‚ two or more coils of insulated
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TABLE OF CONTENTS 1. P-N JUNCTION DIODE CHARACTERISTICS 1 2. ZENER DIODE CHARACTERISTICS 6 3. TRANSISTOR COMMON -BASE CONFIGURATION 11 4. TRANSISTOR CE CHARACTERSTICS 16 6. FULL-WAVE RECTIFIER 26 7. FET CHARACTERISTICS 31 8. h-PARAMETERS OF CE CONFIGURATION 36 9. TRANSISTOR CE AMPLIFIER 43 10. COMMON COLLECTOR AMPLIFIER 48 11. RC COUPLED AMPLIFIER 53 12. COMMON SOURCE FET AMPLIFIER 58 13. WEIN BRIDGE OSCILLATOR 63 14. RC PHASE SHIFT OSCILLATOR 66 15. CURRENT-SERIES
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YAGI-UDA ANTENNA Dr. Shintaro Uda and Dr. Hidetsugu Yagi of the Tohoku Imperial University invented a directional antenna system consisting of an array of coupled parallel dipoles. Yagi-uda or simply yagi antennas or yagi’s are the most high gain antennas. It consists of a driven element‚ a reflector and one or more directors. i.e.‚ yagi uda antenna is an array of a driven element and one or more parasitic elements. The driven element is a resonant half wave dipole usually of metallic rod. The
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circuit. Essentially the device is a switch. Ideally it remains off (voltage blocking state)‚ or appears to have an infinite impedance until both the anode and gate terminals have suitable positive voltages with respect to the cathode terminal. The thyristor then switches on and current flows and continues to conduct without further gate signals. Ideally the thyristor has zero impedance in conduction state. For switching off or reverting to the blocking state‚ there must be no gate signal and the anode
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DESIGN TABLE SECTION 8.5: FREQUENCY TRANSFORMATION LOW-PASS TO HIGH-PASS LOW-PASS TO BAND-PASS LOW-PASS TO BAND-REJECT (NOTCH) LOW-PASS TO ALL-PASS SECTION 8.6: FILTER REALIZATIONS SINGLE POLE RC PASSIVE LC SECTION INTEGRATOR GENERAL IMPEDANCE CONVERTER ACTIVE INDUCTOR FREQUENCY DEPENDENT NEGATIVE
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of accuracy of the standing wave method three absorbing materials are characterized using said principle models. A comparison between measurements with the standing wave method and the predicted surface impedance with the models is shown. KEY WORDS: poroelastic material‚ acoustic surface impedance‚ poroelastic characterization‚ models‚ sound absorption 1. INTRODUCTION The number of products that include a low noise level design increases daily. However‚ apart from the design itself‚ it
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EHV Power Transformers J S Sastry GM (EHV Transformers) Vijai Electricals Topics to be covered • • • • • • • • What is a Transformer Transformer principle Basic design concepts Construction features Materials used and improvements Types of failures and diagnostics Challenges to Transformer Designers Reactors IF YOU HAVE NO DOUBTS YOU HAVE NOT UNDERSTOOD ANYTHING. - a Spanish proverb. What is a Transformer • A transformer is a static equipment which transformers power from one circuit
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