El teléfono

Evolución del teléfono en la historia de la humanidad.

Evolución del Teléfono

El teléfono es un instrumento de comunicación, diseñado para la transmisión de voz y demás sonidos hasta lugares remotos mediante la electricidad, así como para su reproducción. El teléfono contiene un diafragma que vibra al recibir el impacto de ondas de sonido. Las vibraciones (movimiento ondulatorio) se transforman en impulsos eléctricos y se transmiten a un receptor que los vuelve a convertir en sonido.

En el lenguaje coloquial, la palabra ‘teléfono’ también designa todo el sistema al que va conectado un aparato de teléfono; un sistema que permite enviar no sólo voz, sino también datos, imágenes o cualquier otro tipo de información que pueda codificarse y convertirse en energía eléctrica. Esta información viaja entre los distintos puntos conectados a la red. La red telefónica se compone de todas las vías de transmisión entre los equipos de los abonados y de los elementos de conmutación que sirven para seleccionar una determinada ruta o grupo de ellas entre dos abonados.

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Corporate Office

The Walmart corporate office, located in Bentonville, Arkansas, was the original Walmart general office warehouse before it was converted in the 1980s. The corporate campus has since then expanded to about 15 buildings and more than 11,000 associates (employees).

Global Ethics Office

To ensure that we’re constantly adhering to the foundation of integrity and the three basic beliefs that sustain our business, Walmart maintains a Global Ethics Office.
The Global Ethics Office is responsible for sustaining Walmart’s culture of integrity. This includes developing and upholding our policies for ethical behavior for all of our stakeholders everywhere we operate.
But perhaps most important, it includes raising awareness of ethics policies and providing channels for stakeholders to bring ethics concerns to our attention.
The Global Ethics Office:

  • Serves as guide and resource for ethical decision making
  • Provides a confidential and anonymous reporting system
  • Leads a continuing ethics education and communication system

Personal and moral integrity is one of our basic fundamentals, and it has to start with each of us.
-Sam Walton

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Walmart : Save money. Live better.

Walmart serves customers and members more than 200 million times per week at more than 10,130 retail units under 69 different banners in 27 countries. With fiscal year 2012 sales of approximately $444 billion, Walmart employs 2.2 million associates worldwide.

Saving people money to help them live better was the goal that Sam Walton envisioned when he opened the doors to the first Walmart more than 40 years ago. Today, this mission is more important than ever to our customers and members around the world. We work hard every day in all our markets to deliver on this promise. We operate with the same level of integrity and respect that Mr. Sam put in place. It is because of these values and culture that Walmart continues to make a difference in the lives of our customers, members and associates.

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Saving people money to help them live better was the goal that Sam Walton envisioned when he opened the doors to the first Walmart. It’s the focus that underlies everything we do at Walmart. And for the millions of customers who shop in our stores and clubs around the world each week, it means a lot.

Walmart serves customers and members more than 200 million times per week at more than 10,130 retail units under 69 different banners in 27 countries. With fiscal year 2012 sales of approximately $444 billion, Walmart employs 2.2 million associates worldwide.

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