The Regionalverband Saarbrücken is a "Kommunalverband besonderer Art", that is, it is a special mix of a rural district and a district free city. It is located in the south of the Saarland, Germany.
The district Saarbrücken was originally created in 1816.
In 1974 the district and the district-free city Saarbrücken were merged, and the new administrative body was named "Stadtverband Saarbrücken". Although it's not a district like others, most of its administrative tasks are same as those of a district.
The Saar River flows through the district, through the city Saarbrücken in the centre of the district.
Sinaloa
Sinaloa is a northwestern Mexican state. It is bordered by Sonora to the north, Chihuahua to the northeast, Durango to the east, and Nayarit to the south. To the west lies the Pacific Ocean and the Gulf of California, also known as the Sea of Cortez.
Saarlouis (district)
Saarlouis is a Kreis (district) in the middle of the Saarland, Germany.
The district was part of the Holy Roman Empire. After the Napoleonic wars the area went to Prussia, which in 1816 created the district as part of its Rhineland province. From 1936-1945 it was called "Saarlautern", when the Nazi government tried to exchange the French name for a German one.
The main river in the district is the Saar.
Saarpfalz District
Saarpfalz ("Saar-Palatinate") is a Kreis (district) in the south-east of the Saarland, Germany. Neighboring districts are (from west clockwise) Saarbrücken, Neunkirchen, Kusel, Südwestpfalz, district-free Zweibrücken, and the French "département" Moselle.
When after World War I the Saar area went under special government of the League of Nations, the Palatinate area, then part of Bavaria, was split in two parts. The part which went into the Saar became commonly known as Saarpfalz, and was administered by the two "Bezirksamt": St. Ingbert and Homburg. The district Saarpfalz was created in 1974 when the two districts of Saint Ingbert and Homburg were joined. Since 1997 the district has a partnership with Henrico County, Virginia.
Sankt Wendel (district)
Sankt Wendel is a Kreis (district) in the north of the Saarland, Germany. Neighboring districts are Trier-Saarburg, Birkenfeld, Kusel, Neunkirchen, Saarlouis, Merzig-Wadern.
The district was created in 1834 when Prussia bought the Lichtenfeld area from Saxe-Coburg and Gotha. After World War I the Saar area came under special rulership of the League of Nations, and the Sankt Wendel district was split into two parts. The northern part, the "Restkreis Sankt Wendel", was merged into the district Birkenfeld, the southern part stayed in the Saarland in its smaller size.
The district is located in the "Saar-Hunsrück" natural area, a hilly area with elevations between 200 and 600 meters.
The main river in the district is the Nahe. The "Bostalsee" is the biggest tourist lake in the south-west of Germany, covering an area of about 1.2 km².
Respiratory system
The respiratory system, also called the gas exchange system, is the body getting rid of carbon dioxide and taking in oxygen. Carbon dioxide, a waste product, goes out of the body. Oxygen, which the body needs, comes in. The lungs are the main organ to do this. In other words , a "process in which oxidation of organic compounds occurs in cell and energy is released is called as Respiratory system ."
The first step in this process is breathing in air, or inhaling. Inhalation means bringing air rich in oxygen into the body. Exhalation means giving out air rich in carbon dioxide from the body. The second step is gas exchange in the lungs where oxygen is diffused into the blood and the carbon dioxide diffuses out of the blood. The third process is cellular respiration, which produces the chemical energy that the cells in the body need, and carbon dioxide. Finally, the carbon dioxide from cellular respiration is breathed out of body from the lungs.
Breathing is the first step in respiration. For respiration to happen, the body needs a constant supply of oxygen, which is done by breathing. Inhalation is the breathing in of air. To inhale, the lungs expand, decreasing the air pressure in the lungs. This is caused by two actions. The diaphragm (a sheet of muscular tissue that separates the lungs from the abdomen) is pulled downward. Also the muscles between the ribs contract to expand the chest. Both of these actions expand the lungs. To fill the enlarged lungs, air from outside at higher pressure comes rushing into the area of low pressure in the lungs. Air first passes through the nose and mouth, then through the larynx (voice box), then down the trachea (windpipe), and into the lungs and comes out.
The lungs are made of many tubes or branches. As air enters the lungs, it first goes through branches called the bronchi, then through smaller branches called bronchioles, and finally into the air sacs. Gas exchange occurs in the air sacs where oxygen is exchanged with carbon dioxide. The carbon dioxide in the air sacs now need to be exhaled, or breathed out. In the reverse process to inhaling, the diaphragm and the rib muscles relax, causing the lungs to be smaller. As the air pressure in the lungs is greater when the lungs are smaller, air is forced out. The air sacs are able to contract and expand because they are coated with a lubricant, surfactant, this lubricant helps the air sacs inflate while also preventing the collapse of the lungs during deflation.The exhaled air has a high concentration of carbon dioxide and a low concentration of oxygen. The maximum volume of air that can be breathed in and breathed out is called the vital capacity of the lungs and is up to five liters.
The inhaled air goes down to the air sacs at the end of each bronchiole. The air sacs are called alveoli — they have a large surface area, and are moist, thin, and close to a blood supply. The inhaled air has a much greater concentration of oxygen than carbon dioxide whilst the blood flowing to the lungs has a more carbon dioxide than oxygen. This creates a concentration gradient between the air in the air sacs and the blood, meaning there is more oxygen in the air than the blood.
As the membrane, oxygen can easily diffuse in and out. Oxygen at high concentration in the air sacs diffuses into the blood where oxygen concentration is low, and carbon dioxide at high concentration in the blood diffuses into the air sacs where carbon dioxide concentration is low. The oxygen in the blood enters the circulatory system and is used by the cells in the body. The carbon dioxide in the air sacs are exhaled out of the body.
Internal combustion engine
An internal combustion engine is an engine in which combustion, or the burning of fuel, occurs on the inside. There are many kinds but the term often means the machine that Niklaus Otto invented. In this kind, fire makes pressure increase inside a sealed box (cylinder). The pressure pushes a rod which is attached to a wheel. The rod pushes the wheel and makes it spin around. The spinning wheel is attached to other wheels, such as four car wheels, with a belt or a chain. The engine is very strong and can make all the wheels move.
Engines need oil to make them slippery or the moving parts would grind together and stick. Parts of a car engine are measured to 0.01 of a millimeter and some engine parts fit together very tightly.
Internal differs from external combustion where the fire is outside the engine, such as a steam engine.
Most road vehicles use the internal combustion engine today, and most of those use the four-stroke engine. Another type of internal combustion engine is the Wankel engine.
Gas turbines are internal combustion engines that work continuously, not by strokes. Rocket engines and guns are internal combustion engines but they do not turn wheels.
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