Overview. 1  Fennel is a highly aromatic herb, the seeds of which are commonly used as spices and in a variety of culinary and medicinal applications. Tea made by steeping fennel seeds in hot water is enjoyable for pleasure, but this preparation is also regarded in natural medicine as having distinct health benefits. Some of these benefits are based on anecdotal evidence as opposed to clinical research, and fennel seed tea is not to be considered a substitute for medicine.
A Concentric Diffuser system is designed to eliminate the need for traditional duct-work by providing a single air diffuser to supply & return air to each rooftop. A Concentric Diffuser provides conditioned air from a HVAC rooftop unit to a space, while returning air back to the rooftop unit through the same diffuser. Designed to deliver air into an open space, or just below the ceiling of an occupied space using a very short distance.
Concentric contractions: A concentric contraction is a type of muscle contraction where the length of the muscles shorten while undergoing tension. For example, when you pick up a curl bar and perform a biceps curl, the length of your biceps muscles shorten.Your hands start down by your sides, and ends with your hands up by your shoulders.nd it is these three different types of muscular tensions that are used to define the three different types of muscular âcontractionsâ. The three different types of muscular contractions, therefore, are: 1  Concentric contractions (shorten), 2  Eccentric contractions (lengthen). 3  Isometric contractions (remain the same).