Communication Satellites

Communication Satellites Geostationary Satellites • Medium-Earth Orbit Satellites • Low-Earth Orbit Satellites • Satellites versus Fiber Communication Satellites Communication satellite can be thought of as a big microwave repeater in the sky. It contains several transponders, each of which listens to some portion of the spectrum, amplifies the incoming signal, and then rebroadcasts it at another frequency to avoid interference with the incoming signal. Geostationary Satellites maximum 180 satellites(360/2) Orbit slot allocation is done by ITU(International Telecommunication Union). station keeping: The effects of solar, lunar and planetary gravity tend to move them away from their assigned orbit slots and orientation. ITU has allocated certain frequency bands to satellite users. Medium-Earth Orbit Satellites Takes around 6 hours to circle the earth. Compared to GEOs they have smaller footprint on the ground and requires less powerfull transmitters to reach them. Eg: GPS(Global Positioning System) satellites orbiting at about 18,000 km.

Reference: http://seminarprojects.com/Thread-communication-satellites-ppt2#ixzz2TwZTAmdK

AN AUTO-PERFUSING UMBILICAL CORD BLOOD COLLECTION INSTRUMENT

Latest Instrumentation Seminar Topic on AN AUTO PERFUSING UMBILICAL CORD BLOOD COLLECTION INSTRUMENT.An Automated Blood collection Instrument comprises of Mechanical ,electronic and Control components.UCB from the placenta provides a rich source of highly proliferative cells for many clinical uses as it contains rich Hematopoietic Stem Cells (HSCs) .Current collection of UCB uses a syringe to extract blood from placenta. An Automated UCB collection instrument to yield improved performance which comprised four subsystems

Optical Coherence Tomography in Medical Imaging

Instrumentation Seminar Topic on Optical Coherence Tomography. Medical imaging modality with  1-10um resolution and 1-2mm penetration depths.High-resolution, sub- surface, non-invasive or minimally  invasive internal body imaging technique for structural and quantitative imaging.
OCT is analogous to ultrasound imaging

Ball-shaped robots to Inspect Nuclear Power Plants

Latest Instrumentation (IC) seminar topics on Ball-shaped robots to Inspect Nuclear Power Plants . The need for robotic systems in nuclear plant are

• To perform automated and repetitive work.

• Safety of workers and regulation.

• Profitability

Ball shaped robots are are developed by Developed by Massachusetts Institute of  Technology. Read more at the attached seminar presentation.

Optical Coherence Tomography for analysis of the retina

Diagnostic imaging technique that examines living tissue non-invasively. It is based on a complex analysis of the reflection of low coherence radiation from the tissue under examination.OCT allows both qualitative and quantitative analysis of the retina .Qualitative analysis includes description by location, a description of form and structure, identification of anomalous structures, and observation of the reflective qualities of the retina

D.C. MOTOR SPEED CONTROL USING MICROPROCESSOR

The main aim of this project is to determine the use of 8086 Microprocessor to control the speed of a D.C. Motor. By varying the output voltage,the speed of the motor can be controlled.The D.C. supply voltage to the motor is chopped.The programme written on 8086 Microprocessor.It is used for process control applications,in voltage regulators,in electromechanical to gic system.