There are two main types of smoke alarm tech, says Raman Chagger, principal consultant at BRE, the Building Research Establishment. Ionisation-based systems use a tiny amount of radioactive material to charge, or ionise, particles in the air which flow between two small plates. Should smoke interrupt that flow of charged particles, the alarm goes off.
Elise, 21, from Chester, has been to two concerts at Co-op Live, and is going to a third later this year.
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As she recovers and begins to rebuild her life, she now wants to warn others of the danger of sepsis, believing "it could happen to anybody".
第二个是L4商业化试点较为成熟。
No-one has yet taken responsibility for what happened.