Ventilators are typically used by ALS patients having difficulty breathing. There are several kinds of non-invasive ventilators, such as small devices that fit over the nose and mouth. Patients may also opt for a tracheostomy, a surgical procedure in which a tube is placed into the throat.
3. Counters. A counter is a digital sequential logic device that will go through a certain predefined states (for example counting up or down) based on the application of the input pulses. They are utilized in almost all computers and digital electronics systems [1].
Concrete, the humble material behind many a building foundation, makes for nearly indestructible kitchen counters and offers artisan-crafted customization in both color and layout. With these bragging rights, concrete rises above much of the countertop competition. Learn more below and see whether concrete counters are right for your kitchen. The basics: Concrete is composed of water, a binder and a filler. 1  The binder, cement, is most commonly Portland cement, but slag cement and fly ash â both industrial waste by-products â are becoming common additions. 2  The filler, an aggregate, can be anything from sand, gravel and stone to crushed glass and beads.