The SIR model is a simple mathematical model of epidemics. An epidemic is when the number of people infected with a disease is increasing in a population.
S, I, and R stand for:
Below is a graph of a solved SIR model. The bottom (x) axis is time, and the left (y) axis is the population or the number of people.
Blue represents the number of susceptible people. At the beginning of the epidemic, the number of susceptible (blue) people decreases as the number of infected (green) people increases. Gradually the number of recovered (red) people increases. In this particular model, after the epidemic is over, all people have been infected and recovered. This is not always the case; sometimes, some susceptible people remain uninfected.
This model is also missing some parts, such as creating new susceptible people by being born and the removal of susceptible, infected, and recovered people who die. More complicated models can include these parts.
Also, this model does not work well for every disease. It works well where people recover from a disease and become immune, such as measles. Not all infectious diseases follow this pattern. For instance, people infected with HIV never recover, and there is no vaccine, so there is no group of recovered people, only susceptible and infected people. There is also the case where people recover from a disease but do not become immune or lose their immunity over time. For instance, when people get the flu, they are generally only immune for a short time before they become susceptible again.
There are also different kinds of models when as the disease is spread through the water, such as in the case of cholera, or by a vector like a mosquito, such as malaria.
Engadin
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The Engadine is connected by the Julier, Albula, Flüela Passes and the Vereina Tunnel to the northern part of Switzerland and the rest of the canton of Graubünden.
The highest mountains of the wider area of the Engadine is the Bernina Range in the southwestern part.
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Auhausen
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Fridingen
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Bärenthal
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Norwood, Missouri
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Avon, Ohio
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Barberton, Ohio
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Martins Ferry, Ohio
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Martins Ferry is part of the Wheeling metropolitan area.
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Dannemarie, Haut-Rhin
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Piotr Ligienza
Piotr Ligienza (born 31 May 1982) is a Polish actor. He was known for his roles in the series "Ranczo" and "Synowie". He has appeared in the play "Romulus Wielki" (directed by Krzysztof Zanussi).
Ligienza was born in Dzierżoniów, Poland.
Disruptive innovation
Disruptive innovation, sometimes called disruptive technology is the name for a technology or innovation that changes the market: It creates a new market. These new markets are small at first, which makes them uninteresting for established market players. If disruptive innovation is used, the market will grow at a high speed. Eventually, they will replace existing technology, though. An example of this is Flash memory. When it was introduced it was expensive, and capacities were small, compared to hard disks. On the other hand, flash memory is small, and uses little energy. It began to be used in mp3 players and usb flash drives. Eventually, it was used for Solid state disks, which started to replace hard drives.
Clayton M. Christensen first used the term in 1995: Christensen defines a disruptive innovation as a product or service designed for a new set of customers.
"Generally, disruptive innovations were technologically straightforward, consisting of off-the-shelf components put together in a product architecture that was often simpler than [previous] approaches. They offered less of what customers in established markets wanted and so could rarely be initially employed there. They offered a different package of attributes valued only in emerging markets remote from, and unimportant to, the mainstream."
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Dessenheim
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Ataullah Behmanesh
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Behmanesh died of a stroke in Tehran on July 2, 2017 at the age of 94.
Joe Robinson (actor)
Joseph Robinson (31 May 1927 – 3 July 2017) was an English actor and stuntman. He was known for his roles in "A Kid for Two Farthings", "The Loneliness of the Long Distance Runner", and in "Thor and the Amazon Women".
Robinson died at the age of 90 on July 3, 2017, in Brighton, East Sussex of dementia-related complications.
Irina Ratushinskaya