Electricity can be stored directly for a short time in capacitors, somewhat longer electrochemically in , and much longer chemically (e.g. hydrogen), mechanically (e.g. pumped hydropower) or as heat. The first pumped hydroelectricity was constructed at the end of the 19th century around in Italy, Austria, and Switzerland. The technique rapidly expanded during the 196.
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Recently, the number of mobile subscribers, wireless services and applications have witnessed tremendous growth in the fourth and fifth generations (4G and 5G) cellular networks. In turn, the number of bas.
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