Importance of Oral Health in a Child Essay Example | Topics and Well Written Essays - 500 words

Importance of Oral Health in a Child - Essay Example Although the accidental cause due to injury or abrasion could not be controlled, tooth decay could be prohibited and avoided. The care for primary teeth has not given emphasis because of the fact that primary teeth are just temporary and will be replaced later by permanent teeth. For this reason, tooth decay among children is not new. Bacterial respiration or acids from the diet could cause tooth decay in children. The oral hygiene and care, and diet of the child could highly influence the rate and occurrence of tooth decay. Mahoney and Kilpatrick stated that oral medications such as mouthwash and toothpaste affect the rate of tooth decay. The high acidity and the presence of EDTA (ethylenediaminetetraacetic acid), which is known as dematerializing agent, in mouthwash makes the mouthwash a possible cause of tooth wear. Their study also showed that the low pH of medicine such as asthma medicine of children increased tooth wear. Furthermore, they mentioned that the abrasion caused by brushing of teeth followed by intake of relatively acidic beverages showed an increase rate of tooth decay. According to Marsh all et al., there are high occurrences of tooth caries to children who have frequent consumption of soda pops as compared to milk and 100% pure fruit juice.

Edge Wave Formation Essay Example | Topics and Well Written Essays - 1000 words

Edge Wave Formation - Essay Example They can occur in a selection of different scales: high-frequency waves reverberate by the confrontation wind waves (Guza and Davis, 1974), enforced by incident wave groups (Schffer, 168) and very low-frequency waves of oceanographic level (Munk et al., 127-132). Edge waves may participate in an important role in coastal dynamics, as they are associated to the creation of split currents (Bowen and Inman, 5479-5490) or beach cusps (Guza and Inman, 1975). Recently, Ciriano et al. (2000) have made known that edge waves may tempt resonant vibrations inside harbors with the entrance being opened to the beach. (3680-3691) The occurrence of topographically trapped waves in promontory and estuaries has been studied tentatively by Stoker and Johnson (1991), whose consequences agree with field interpretation by Schwing (157-180). Edge wave theory dates back to Stokes' (1846) clarification for a wave trapped on a plane inclined beach. Eckart (1951 p.99) implemented the linear low water theory and demonstrated that Stokes' answer symbolized only the first of other likely manners. Ursell (1952) achieved the exact results to the linearised edge problem. (79-97) Green (1986) summarized the solution of the problem of an edge wave proliferated along a seawall.(119-125) Neu and Oh (1987) offered a method to solve the type of edge wave troubles where the near coast topography is characterized by a series of linearly unstable depth sections. (227-240) They wrote the explanation in terms of Kummer's functions and regarded as two beach reports: a regular beach slope ended with a constant depth area and the case of an offshore piece. A conventional explanation in coastal engineering to stops the erosion of a beach or to have the power of the alongshore deposits transport is to assemble a groin upright to the coastline. This arrangement, built with gravel or as raised area, is leaky. In addition, some seashore has a berth vertical to the seashore in order to have entrance to deeper waters. In this paper, the circulation and conversion of an incident edge wave in the course of a permeable coastal formation will be investigated in a manner that be similar to the one dealt by Stoker and Johnson (1991). The edge wave difficulty has originated subsequent Neu and Oh's result. A beach outline with a sheer foreshore and a flat surface slope ending with a straight shelf with an upright permeable formation extending from the beach up to far offshore is measured. Because the distance across of the groins evaluated to the edge wave length is exceptionally small, usually less than 1/50, dissipation within the formation is primarily due to the unexpected narrowing and spreading out of the flow and depends generally on the Keulegan-Carpenter number distinct as UT/a, where U is a representative speed at the gaps, T is the wave period and a is a distinguishing dimension of the holes. For groins, UT/a is a large number and consequently head loss can be adequately deliberated with a form ula quadratic to the local speed (Mei et al., 217-239). As the edge wave disseminated through the coastal formation, part of it's alongshore force is replicated, part is spreaded and part is degenerated on the formation. The replicated part obstructs with the arriving wave, creating up a