The aim of this report is to research wireless antennas and differences between them. Antennas are included 3 types: omnidirectional‚ semi-directional‚ and highly-directional. Any antenna has three fundamental properties: gain‚ directional and polarization. Omnidirectional Antennas. We can use this antenna in a: point-multipoint link‚ warehouse‚ hotspot‚ trade show‚ airport. The omnidirectional antennas transmit a signal in all directions‚ it is known dipole ("non-directional") antenna. The
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“IF THERE IS NO ELECTRICITY” To think of life without electricity is almost impossible today. Elec tricity provides all the comforts of life. We find ourselves completely helpless and feel its importance whenever power fails or when the sup ply is irregular. We curse the government for its failure to supply unin terrupted electric supply. In case of no electricity our life would be totally different. We will have to use earthen lamps‚ lantern or candle-light instead of electric bulbs and tubes
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Lightning - Each bolt can contain up to one billion volts of electricity - Electrical discharge is caused by an imbalance between positive and negative charges in the atmosphere - Colliding particles of rain‚ ice‚ or snow increase this imbalance and often negatively charge the lower reaches of storm clouds - Objects on the ground‚ like steeples‚ trees‚ and the Earth itself‚ become positively charged - A step-like series of negative charges‚ called a stepped leader‚ works
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McDonald ’s Wireless Access The growing number of wireless users in the United States includes thousands of mobile professionals‚ business travelers‚ and students who need to connect to work‚ family‚ and friends while on-the-go and are willing to pay for a convenient wireless service option. With only one major competitor‚ high-priced Starbucks/T-Mobile‚ an attractive wireless service offering could have a potentially significant impact on revenue‚ both in terms of income from wireless services and
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possible with wireless technology.1 Innovations in communication‚ particularly the development of wireless technology‚ have allowed people to reach out to virtually anyone wherever they are on the planet. The great thing about wireless technology is that they make it possible to talk to someone very clearly‚ as if they are just next door. They basically bridge the gap between people. We depend so much on it that this technology impacts on the successes and failures in our lives. Wireless technology
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Due to the rise in demand for wireless sensor networks in recent times‚ significant shift is observed from traditional‚ wired technologies to upcoming wireless technologies. Asia-Pacific is expected to grow at the highest rate due to increase in production activities in APAC‚ huge population base‚ and lucrative government policies. China is‚ in fact‚ the growth engine for automation in Asia-Pacific; in spite of lower levels of plant automation. India is also gaining market shares worldwide.The WSN
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Electricity and Magnetism Electricity Circuit symbols Potential difference The energy which is delivered to an electric circuit comes from the supply. The greater the potential difference of the power supply the more energy is delivered. Potential difference is measured in volts‚ which has the unit symbol V. Cells in series The more chemical cells that are connected in series the greater the potential difference that they supply. The potential difference of a number of cells connected
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2 devices that use static electricity to funtion 1. Van de Graaff generator When the motor is turned on‚ the lower roller (charger) begins turning the belt. The belt is made of rubber and the lower roller is covered in silicon tape‚ the lower roller begins to build a negative charge and the belt builds a positive charge. Silicon is more negative than rubber so the lower roller is receiving electrons from the belt when it goes over the roller. The positively charged atomic nuclei‚ try to
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Electricity’s impact on Society Electricity has had multiple impacts on society both positve and negative. Electricity has had an effect on everyone in the world‚ even though some people have no understanding or have no use for electricity. For example‚ there are tribes in the Amazon who have never seen a lightbulb who have never beared witness too the heracy of Big brother and yet they are still effected by electricity. The chainsaws which cut down their beloved forests are designed by a man called
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Proceedings of IEEE CCIS2012 AN ID-BASED MULTIPLE AUTHENTICATION SCHEME AGAINST ATTACKS IN WIRELESS SENSOR NETWORKS Siwei Peng Dept. of Computer Science‚ Beijing University of Posts and Telecommunications‚ Beijing 100876‚ China saul.perceive@gmail.com Abstract A wireless sensor network (WSN) consists of a number of tiny‚ low-cost‚ and resource-constrained sensor nodes‚ but is often deployed in unattended and harsh environments to perform various monitoring tasks. Therefore‚ WSN is venerable
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