Telecommunications systems emit radiofrequency, which is an invisible electromagnetic radiation. Mobile phones operate with microwaves (450900 MHz in the analog service, and 1,82,2 GHz in the digital service) very close ...

This paper makes use of an experiment to test the relationship between the actual average time students spend using their smartphones per day and academic performance. Differently from previous studies that rely on ...

This essay highlights the main habits of consumption and disposal of cellular phones in Londrina/PR. It focuses on the problem generated by devices that do not have an environmentally appropriate destination, and it discusses ...

Os sistemas de telecomunicações emitem radiofreqüência, uma radiação eletromagnética invisível. Telefones celulares transmitem microondas (450900 MHz no sistema analógico e 1,82,2 GHz no sistema digital), muito próximo à ...

Abstract. The goal of this study is to introduce the theoretical foundation of a new concept in medical technology that is centered on the cellular phone. The concept was conceived with the needs of medically underserved ...