1.
Geographic coordinate system
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A geographic coordinate system is a coordinate system used in geography that enables every location on Earth to be specified by a set of numbers, letters or symbols. The coordinates are chosen such that one of the numbers represents a vertical position. A common choice of coordinates is latitude, longitude and elevation, to specify a location on a two-dimensional map requires a map projection. The invention of a coordinate system is generally credited to Eratosthenes of Cyrene. Ptolemy credited him with the adoption of longitude and latitude. Ptolemys 2nd-century Geography used the prime meridian but measured latitude from the equator instead. Mathematical cartography resumed in Europe following Maximus Planudes recovery of Ptolemys text a little before 1300, in 1884, the United States hosted the International Meridian Conference, attended by representatives from twenty-five nations. Twenty-two of them agreed to adopt the longitude of the Royal Observatory in Greenwich, the Dominican Republic voted against the motion, while France and Brazil abstained. France adopted Greenwich Mean Time in place of local determinations by the Paris Observatory in 1911, the latitude of a point on Earths surface is the angle between the equatorial plane and the straight line that passes through that point and through the center of the Earth. Lines joining points of the same latitude trace circles on the surface of Earth called parallels, as they are parallel to the equator, the north pole is 90° N, the south pole is 90° S. The 0° parallel of latitude is designated the equator, the plane of all geographic coordinate systems. The equator divides the globe into Northern and Southern Hemispheres, the longitude of a point on Earths surface is the angle east or west of a reference meridian to another meridian that passes through that point. All meridians are halves of great ellipses, which converge at the north and south poles, the prime meridian determines the proper Eastern and Western Hemispheres, although maps often divide these hemispheres further west in order to keep the Old World on a single side. The antipodal meridian of Greenwich is both 180°W and 180°E, the combination of these two components specifies the position of any location on the surface of Earth, without consideration of altitude or depth. The grid formed by lines of latitude and longitude is known as a graticule, the origin/zero point of this system is located in the Gulf of Guinea about 625 km south of Tema, Ghana. To completely specify a location of a feature on, in, or above Earth. Earth is not a sphere, but a shape approximating a biaxial ellipsoid. It is nearly spherical, but has an equatorial bulge making the radius at the equator about 0. 3% larger than the radius measured through the poles, the shorter axis approximately coincides with the axis of rotation
2.
Rhine
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The largest city on the river Rhine is Cologne, Germany, with a population of more than 1,050,000 people. It is the second-longest river in Central and Western Europe, at about 1,230 km, with an average discharge of about 2,900 m3/s. The Rhine and the Danube formed most of the inland frontier of the Roman Empire and, since those days. The many castles and fortifications along the Rhine testify to its importance as a waterway in the Holy Roman Empire, in the modern era, it has become a symbol of German nationalism. The variant of the name of the Rhine in modern languages are all derived from the Gaulish name Rēnos, spanish is with French in adopting the Germanic vocalism Rin-, while Italian, Occitan and Portuguese retain the Latin Ren-. The Gaulish name Rēnos belongs to a class of river names built from the PIE root *rei- to move, flow, run, the grammatical gender of the Celtic name is masculine, and the name remains masculine in German, Dutch and French. The Old English river name was variously inflected as masculine or feminine, the length of the Rhine is conventionally measured in Rhine-kilometers, a scale introduced in 1939 which runs from the Old Rhine Bridge at Constance to Hoek van Holland. The river length is shortened from the rivers natural course due to a number of canalisation projects completed in the 19th and 20th century. The total length of the Rhine, to the inclusion of Lake Constance and its course is conventionally divided as follows, The Rhine carries its name without distinctive accessories only from the confluence of the Vorderrhein and Hinterrhein near Tamins-Reichenau. Above this point is the catchment of the headwaters of the Rhine. It belongs almost exclusively to the Swiss Canton of Graubünden, ranging from Gotthard Massif in the west via one valley lying in Ticino, traditionally, Lake Toma near the Oberalp Pass in the Gotthard region is seen as the source of the Vorderrhein and the Rhine as a whole. The Hinterrhein rises in the Rheinwald valley below Mount Rheinwaldhorn, the Vorderrhein, or Anterior Rhine, springs from Lai da Tuma, near the Oberalp Pass and passes the impressive Ruinaulta formed by the largest visible rock slide in the alps, the Flims Rockslide. A multiday trekking route is signposted along the young Rhine called Senda Sursilvana, the Hinterrhein/Rein Posteriur, or Posterior Rhine, starts from the Paradies Glacier, near the Rheinwaldhorn. One of its tributaries, the Reno di Lei, drains the Valle di Lei on politically Italian territory, after three main valleys separated by the two gorges, Roflaschlucht and Viamala, it reaches Reichenau. The Vorderrhein arises from numerous source streams in the upper Surselva, one source is Lai da Tuma with the Rein da Tuma, which is usually indicated as source of the Rhine, flowing through it. Into it flow tributaries from the south, some longer, some equal in length, such as the Reno di Medel, the Rein da Maighels, and the Rein da Curnera. The Cadlimo Valley in the Canton of Ticino is drained by the Reno di Medel, all streams in the source area are partially, sometimes completely, captured and sent to storage reservoirs for the local hydro-electric power plants. In its lower course the Vorderrhein flows through a gorge named Ruinaulta through the Flims Rockslide, the whole stretch of the Vorderrhein to the Rhine confluence near Reichenau-Tamins is accompanied by a long-distance hiking trail called Senda Sursilvana
3.
Cologne
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Cologne is the largest city in the German federal State of North Rhine-Westphalia and the fourth-largest city in Germany. It is located within the Rhine-Ruhr metropolitan region, one of the major European metropolitan areas, and with more than ten million inhabitants, Cologne is located on both sides of the Rhine River, less than eighty kilometres from Belgium. The citys famous Cologne Cathedral is the seat of the Catholic Archbishop of Cologne, the University of Cologne is one of Europes oldest and largest universities. Cologne was founded and established in Ubii territory in the first century AD as the Roman Colonia Claudia Ara Agrippinensium, Cologne, the French version of the citys name, has become standard in English as well. The city functioned as the capital of the Roman province of Germania Inferior, during the Middle Ages it flourished on one of the most important major trade routes between east and west in Europe. Cologne was one of the members of the Hanseatic League and one of the largest cities north of the Alps in medieval. Up until World War II the city had several occupations by the French. Cologne was one of the most heavily bombed cities in Germany during World War II, the bombing reduced the population by 95%, mainly due to evacuation, and destroyed almost the entire city. With the intention of restoring as many buildings as possible. Cologne is a cultural centre for the Rhineland, it hosts more than thirty museums. Exhibitions range from local ancient Roman archeological sites to contemporary graphics, the Cologne Trade Fair hosts a number of trade shows such as Art Cologne, imm Cologne, Gamescom, and the Photokina. The first urban settlement on the grounds of modern-day Cologne was Oppidum Ubiorum, founded in 38 BC by the Ubii, in 50 AD, the Romans founded Colonia on the Rhine and the city became the provincial capital of Germania Inferior in 85 AD. The city was named Colonia Claudia Ara Agrippinensium in 50 AD, considerable Roman remains can be found in present-day Cologne, especially near the wharf area, where a notable discovery of a 1900-year-old Roman boat was made in late 2007. From 260 to 271 Cologne was the capital of the Gallic Empire under Postumus, Marius, in 310 under Constantine a bridge was built over the Rhine at Cologne. Roman imperial governors resided in the city and it one of the most important trade. Cologne is shown on the 4th century Peutinger Map, maternus, who was elected as bishop in 313, was the first known bishop of Cologne. The city was the capital of a Roman province until occupied by the Ripuarian Franks in 462, parts of the original Roman sewers are preserved underneath the city, with the new sewerage system having opened in 1890. Early medieval Cologne was part of Austrasia within the Frankish Empire, Cologne had been the seat of a bishop since the Roman period, under Charlemagne, in 795, bishop Hildebold was promoted to archbishop
4.
North Rhine-Westphalia
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North Rhine-Westphalia is the most populous state of Germany, with a population of approximately 18 million, and the fourth largest by area. Its capital is Düsseldorf, the most populous city is Cologne, four of Germanys ten largest cities—Cologne, Düsseldorf, Dortmund, and Essen—are located within the state, as well as the largest metropolitan area on the European continent, Rhine-Ruhr. North Rhine-Westphalia was formed in 1946 as a merger of the provinces of North Rhine and Westphalia, the state has been run by a coalition of the Social Democrats and Greens since 2010. The Ubii and some other Germanic tribes such as the Cugerni were later settled on the west side of the Rhine in the Roman province of Germania Inferior, North of the Sigambri and the Rhine region were the Bructeri. By the 8th century the Frankish dominion was established in western Germany. But at the time, to the north, Westphalia was being taken over by Saxons pushing south. The Merovingian and Carolingian Franks eventually built an empire which controlled first their Ripuarian kin, the Ottonian dynasty had both Saxon and Frankish ancestry. As the central power of the Holy Roman Emperor weakened, the Rhineland split into small independent principalities, each with its separate vicissitudes. Such struggles as the War of the Limburg Succession therefore continued to create military, Aachen was the place of coronation of the German emperors, and the ecclesiastical principalities of the Rhine bulked largely in German history. Prussia first set foot on the Rhine in 1609 by the occupation of the Duchy of Cleves and about a century later Upper Guelders and Moers also became Prussian. At the peace of Basel in 1795 the whole of the bank of the Rhine was resigned to France. In 1920, the districts of Eupen and Malmedy were transferred to Belgium, around 1 AD there were numerous incursions through Westphalia and perhaps even some permanent Roman or Romanized settlements. The Battle of Teutoburg Forest took place near Osnabrück and some of the Germanic tribes who fought at this came from the area of Westphalia. Charlemagne is thought to have spent considerable time in Paderborn and nearby parts and his Saxon Wars also partly took place in what is thought of as Westphalia today. Popular legends link his adversary Widukind to places near Detmold, Bielefeld, Lemgo, Osnabrück, Widukind was buried in Enger, which is also a subject of a legend. Along with Eastphalia and Engern, Westphalia was originally a district of the Duchy of Saxony, in 1180 Westphalia was elevated to the rank of a duchy by Emperor Barbarossa. The Duchy of Westphalia comprised only an area south of the Lippe River. Parts of Westphalia came under Brandenburg-Prussian control during the 17th and 18th centuries, the Peace of Westphalia of 1648, signed in Münster and Osnabrück, ended the Thirty Years War
5.
Germany
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Germany, officially the Federal Republic of Germany, is a federal parliamentary republic in central-western Europe. It includes 16 constituent states, covers an area of 357,021 square kilometres, with about 82 million inhabitants, Germany is the most populous member state of the European Union. After the United States, it is the second most popular destination in the world. Germanys capital and largest metropolis is Berlin, while its largest conurbation is the Ruhr, other major cities include Hamburg, Munich, Cologne, Frankfurt, Stuttgart, Düsseldorf and Leipzig. Various Germanic tribes have inhabited the northern parts of modern Germany since classical antiquity, a region named Germania was documented before 100 AD. During the Migration Period the Germanic tribes expanded southward, beginning in the 10th century, German territories formed a central part of the Holy Roman Empire. During the 16th century, northern German regions became the centre of the Protestant Reformation, in 1871, Germany became a nation state when most of the German states unified into the Prussian-dominated German Empire. After World War I and the German Revolution of 1918–1919, the Empire was replaced by the parliamentary Weimar Republic, the establishment of the national socialist dictatorship in 1933 led to World War II and the Holocaust. After a period of Allied occupation, two German states were founded, the Federal Republic of Germany and the German Democratic Republic, in 1990, the country was reunified. In the 21st century, Germany is a power and has the worlds fourth-largest economy by nominal GDP. As a global leader in industrial and technological sectors, it is both the worlds third-largest exporter and importer of goods. Germany is a country with a very high standard of living sustained by a skilled. It upholds a social security and universal health system, environmental protection. Germany was a member of the European Economic Community in 1957. It is part of the Schengen Area, and became a co-founder of the Eurozone in 1999, Germany is a member of the United Nations, NATO, the G8, the G20, and the OECD. The national military expenditure is the 9th highest in the world, the English word Germany derives from the Latin Germania, which came into use after Julius Caesar adopted it for the peoples east of the Rhine. This in turn descends from Proto-Germanic *þiudiskaz popular, derived from *þeudō, descended from Proto-Indo-European *tewtéh₂- people, the discovery of the Mauer 1 mandible shows that ancient humans were present in Germany at least 600,000 years ago. The oldest complete hunting weapons found anywhere in the world were discovered in a mine in Schöningen where three 380, 000-year-old wooden javelins were unearthed
6.
Deutsche Bundesbahn
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The Deutsche Bundesbahn or DB was formed as the state railway of the newly established Federal Republic of Germany on 7 September 1949 as a successor of the Deutsche Reichsbahn-Gesellschaft. After World War II, each of the governments of the Allied Occupation Zones in Germany was de facto in charge of the German railways in their respective territories. With the formation of the FRG these successor organizations of the DRG were reunited, the railways in the Saarland joined on 1 January 1957. The DB was a company that, with few local exceptions. The DB was placed under the control of the Bundesverkehrsministerium, with its headquarters in Frankfurt, in 1985 the DB was the third-largest employer in the FRG, with a strength of 322,383 employees. A special transit police provided security, the immediate tasks in the early years after the end of World War II involved the reconstruction of the heavily damaged infrastructure and the replenishment of locomotives and rolling stock. Contrary to the Deutsche Reichsbahn in the GDR, the DB was not subject to reparations, during the early years, new steam engines were constructed and placed into service. The last new locomotive type was the Class 10, which entered service in 1957. Only two units of class 10 were built, in 1959 DB took the last steam locomotive delivery when the last of the class 23 locomotives was delivered. Soon, with increase in mass motorization, the railway started to lose passenger volume, as a result, rail buses were introduced on some lines, while other smaller volume lines were closed. The later years of this saw a decrease and eventual phasing out of steam engines. Traction was provided increasingly by diesel and electric engines, with increased use of diesel and electric locomotives, progress was made in decreasing travel time for passengers. New types of trains were introduced such as the Trans Europ Express. Transport of goods also had to compete with the competition from trucks. Furthermore, traditional services such as coal and iron ore shipments declined with the changes in the overall economy, after the introduction of the TGV in France, the ICE system of high speed passenger trains was developed. Significant stretches of new high speed track, like the Hanover-Würzburg high-speed rail line, had to be laid or upgraded, other characteristics of this epoch are the introduction of computer systems and the steps taken towards an integrated system of European railways. Externally, rolling stock displayed more colourful and varied livery schemes, the two German states were reunified in October 1990 with both DB and DR now being special funds of the German Federal government. Article 26 of the Unification Treaty stipulated the DR to be merged with DB at the earliest opportunity
7.
Tied-arch bridge
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Therefore, the design is often called a bowstring-arch or bowstring-girder bridge. In addition, since they do not depend on horizontal compression forces for their integrity, tied-arch bridges can be prefabricated offsite, and subsequently floated, hauled or lifted into place. Notable bridges of this include the Fremont Bridge in Portland, Oregon as well as the first computer designed bridge of this type the Fort Pitt Bridge in Pittsburgh. A bowstring truss bridge is similar in appearance to a tied-arch, however, the visual distinction is a tied-arch bridge will not have substantial diagonal members between the vertical members. Both the tied-arch bridge and the suspension bridge place only vertical loads on the anchorage. In addition, problems with electroslag welds, while not isolated to tied-arch bridges, resulted in costly, the structure as a whole was described as nonredundant, failure of either of the two tie girders would result in failure of the entire structure
8.
Concrete
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Concrete is a composite material composed of coarse aggregate bonded together with a fluid cement that hardens over time. Most concretes used are lime-based concretes such as Portland cement concrete or concretes made with other hydraulic cements, when aggregate is mixed together with dry Portland cement and water, the mixture forms a fluid slurry that is easily poured and molded into shape. The cement reacts chemically with the water and other ingredients to form a matrix that binds the materials together into a durable stone-like material that has many uses. Often, additives are included in the mixture to improve the properties of the wet mix or the finished material. Most concrete is poured with reinforcing materials embedded to provide tensile strength, famous concrete structures include the Hoover Dam, the Panama Canal, and the Roman Pantheon. The earliest large-scale users of technology were the ancient Romans. The Colosseum in Rome was built largely of concrete, and the dome of the Pantheon is the worlds largest unreinforced concrete dome. Today, large concrete structures are made with reinforced concrete. After the Roman Empire collapsed, use of concrete became rare until the technology was redeveloped in the mid-18th century, today, concrete is the most widely used man-made material. The word concrete comes from the Latin word concretus, the passive participle of concrescere, from con-. Perhaps the earliest known occurrence of cement was twelve years ago. A deposit of cement was formed after an occurrence of oil shale located adjacent to a bed of limestone burned due to natural causes and these ancient deposits were investigated in the 1960s and 1970s. On a human timescale, small usages of concrete go back for thousands of years and they discovered the advantages of hydraulic lime, with some self-cementing properties, by 700 BC. They built kilns to supply mortar for the construction of houses, concrete floors. The cisterns were kept secret and were one of the reasons the Nabataea were able to thrive in the desert, some of these structures survive to this day. In the Ancient Egyptian and later Roman eras, it was re-discovered that adding volcanic ash to the mix allowed it to set underwater, similarly, the Romans knew that adding horse hair made concrete less liable to crack while it hardened, and adding blood made it more frost-resistant. Crystallization of strätlingite and the introduction of pyroclastic clays creates further fracture resistance, german archaeologist Heinrich Schliemann found concrete floors, which were made of lime and pebbles, in the royal palace of Tiryns, Greece, which dates roughly to 1400–1200 BC. Lime mortars were used in Greece, Crete, and Cyprus in 800 BC, the Assyrian Jerwan Aqueduct made use of waterproof concrete
9.
Steel
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Steel is an alloy of iron and other elements, primarily carbon, that is widely used in construction and other applications because of its high tensile strength and low cost. Steels base metal is iron, which is able to take on two forms, body centered cubic and face centered cubic, depending on its temperature. It is the interaction of those allotropes with the elements, primarily carbon. In the body-centred cubic arrangement, there is an atom in the centre of each cube. Carbon, other elements, and inclusions within iron act as hardening agents that prevent the movement of dislocations that otherwise occur in the lattices of iron atoms. The carbon in steel alloys may contribute up to 2. 1% of its weight. Steels strength compared to pure iron is possible at the expense of irons ductility. With the invention of the Bessemer process in the mid-19th century and this was followed by Siemens-Martin process and then Gilchrist-Thomas process that refined the quality of steel. With their introductions, mild steel replaced wrought iron, further refinements in the process, such as basic oxygen steelmaking, largely replaced earlier methods by further lowering the cost of production and increasing the quality of the product. Today, steel is one of the most common materials in the world and it is a major component in buildings, infrastructure, tools, ships, automobiles, machines, appliances, and weapons. Modern steel is generally identified by various grades defined by assorted standards organizations, the noun steel originates from the Proto-Germanic adjective stakhlijan, which is related to stakhla. The carbon content of steel is between 0. 002% and 2. 1% by weight for plain iron–carbon alloys and these values vary depending on alloying elements such as manganese, chromium, nickel, iron, tungsten, carbon and so on. Basically, steel is an alloy that does not undergo eutectic reaction. In contrast, cast iron does undergo eutectic reaction, too little carbon content leaves iron quite soft, ductile, and weak. Carbon contents higher than those of steel make an alloy, commonly called pig iron, while iron alloyed with carbon is called carbon steel, alloy steel is steel to which other alloying elements have been intentionally added to modify the characteristics of steel. Common alloying elements include, manganese, nickel, chromium, molybdenum, boron, titanium, vanadium, tungsten, cobalt, and niobium. Additional elements are important in steel, phosphorus, sulfur, silicon, and traces of oxygen, nitrogen, and copper. Alloys with a higher than 2. 1% carbon content, depending on other element content, cast iron is not malleable even when hot, but it can be formed by casting as it has a lower melting point than steel and good castability properties
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