The sea develops a back-and-forth movement.
The back and forth movement is the movement that something makes when, after completing a journey, it retraces its steps and retraces the journey in the opposite direction.
For example: "He was observing the swing of the clock pendulum for long minutes, abstracted from those around him" , "He hit the sandbag for the last time and left without looking at its swing" , "The swing of the trees, a product of the wind, scared the girl.”
The sea makes a typical swaying movement. With each wave that reaches the shore, the sea advances over the sand, but then retreats. In this way, in the view of the person who is located on the beach , the sea moves back and forth.
Desalination of seawater through the movement of waves
Continuing with the theme of the sea, the process known as desalination consists of removing salt from its water, and for this desalination plants are used, thanks to which human beings obtain drinking water , so necessary for life.
One of the big problems with desalination is its high cost, and that is why many researchers do not rest in their search for increasingly cheaper alternatives. Such is the case of Chris Matthews and Justin Sonnett , two students from the University of North Carolina , who in 2015 presented a project for a desalination plant that requires nothing more than the swaying of waves to operate .
The name of this system is SAROS , short for Swell Acuated Reverse Osmosis System , and was designed to assist those who cannot access fresh water. This salinizer is small in size, and this makes it easy to move and locate in different areas of the sea , since it only requires the aforementioned movement of water to operate.
Regarding the structure of SAROS , it consists of buoys at its base that allow it to float, and a pendulum that moves with the sway of the waves and feeds a propulsion system thanks to which the water is pumped at high pressure through a reverse osmosis membrane. Finally, the drinking water produced is stored in tanks until extracted.
It is important to note that conventional desalination plants require a large amount of electrical energy to operate, while SAROS manages to generate energy from the water itself, and this particularity makes it a creation that is highly respectful of the environment and convenient from a point of view. from an economic point of view. If we add its self-sustaining nature to its small size, we understand that we are faced with an accessible and convenient system .
The idea of back and forth can be associated with a fluctuation.
The term associated with instability and fluctuation
The notion of swaying is also used with reference to the instability , oscillation or fluctuation of a thing. In this case, the idea of ups and downs is associated with something negative since the lack of stability implies a risk: “The ups and downs of the economy worry citizens,” “I hope that we will soon overcome this ups and downs and that we will return to the path of growth.” , “Since we got married, our relationship has gone through several ups and downs.”
Take the case of the economy of two countries. If , in countryOn the other hand, in country Z the GDP grew by 1% in 2011 , fell by 3% in 2012 , rose again by 2% in 2013 and fell by 6% in 2014 : that is why it can be said that the economy showed a worrying swing. .
Life is full of ups and downs, in all its aspects, from the emotional level to the economic situation, and we must face them with courage and maturity to be able to move forward. In the best of cases, the experience that the numerous battles give us prepares us to increasingly reduce the impact of these comings and goings.