Coal mining generates significant adverse environmental impacts. Historically, coal mining has been a very dangerous activity and the list of historical coal mining disasters is a long one. Underground mining hazards include suffocation, gas poisoning, roof collapse and gas explosions.
The term 'OVD' (Optically Variable Device) is used to describe both laser generated hologram images and electron beam generated images. These optically variable devices are created in highly-secure facilities and are at the forefront of overt asset and brand protection programmes.
ARVD is a specific type of cardiomyopathy (a disorder/disease of the cardiac muscle). With ARVD, the body progressively replaces the muscle of the right ventricle with fatty and fibrous tissue. It can disrupt the heart's electrical system, and trigger sudden cardiac arrest (SCA).This is also called arrhythmogenic right ventricular cardiomyopathy (ARVC). ARVD is caused by a mutation in one of your genes.ith ARVD, the body progressively replaces the muscle of the right ventricle with fatty and fibrous tissue. It can disrupt the heart's electrical system, and trigger sudden cardiac arrest (SCA). This is also called arrhythmogenic right ventricular cardiomyopathy (ARVC).