Certain substances can contribute to an abnormal/irregular heartbeat, including: 1  Caffeine. 2  Tobacco. 3  Alcohol. 4  Cold and cough medications. 5  Appetite suppressants. 6  Psychotropic drugs (used to treat certain mental illnesses) 7  Antiarrhythmics (paradoxically, the same drugs used to treat arrhythmia can also cause arrhythmia.
Founded as an independent company in 1982, RSA Security, Inc. was acquired by EMC Corporation in 2006 for US$2.1 billion and operates as a division within EMC. RSA is based in Bedford, Massachusetts, with regional headquarters in Bracknell (UK) and Singapore, and numerous international offices.
Electromagnetic compatibility (EMC) is the branch of electrical sciences which studies the unintentional generation, propagation and reception of electromagnetic energy with reference to the unwanted effects (electromagnetic interference, or EMI) that such energy may induce.hile electromagnetic interference (EMI) is a phenomenon-the radiation emitted and its effects-electromagnetic compatibility (EMC) is an equipment characteristic or property-not to behave unacceptably in the EMI environment.