|
Wendefurth Dam
The Wendefurth Dam (german: Talsperre Wendefurth) near Wendefurth in the Harz is one of the dams downstream of the Rappbode Dam, that provides flood protection as well as impounding the River Bode to provide the lower reservoir for the Wendefurth Power Station. In addition it is a bathing lake and also supports fish farming. Dam wall The actual dam is a high gravity dam made of 16 segments that is above the valley floor and wide at the crest. The individual segments of the dam are sealed on the upstream side with copper sheets set into the concrete Concrete is a composite material composed of fine and coarse aggregate bonded together with a fluid cement (cement paste) that hardens (cures) over time. Concrete is the second-most-used substance in the world after water, and is the most wi .... In addition the joints are sealed with tar and hemp. The flexure of the individual segments under water pressure is constantly monitored. By means of pendulums suspended on the dam ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Germany
Germany,, officially the Federal Republic of Germany, is a country in Central Europe. It is the second most populous country in Europe after Russia, and the most populous member state of the European Union. Germany is situated between the Baltic and North seas to the north, and the Alps to the south; it covers an area of , with a population of almost 84 million within its 16 constituent states. Germany borders Denmark to the north, Poland and the Czech Republic to the east, Austria and Switzerland to the south, and France, Luxembourg, Belgium, and the Netherlands to the west. The nation's capital and most populous city is Berlin and its financial centre is Frankfurt; the largest urban area is the Ruhr. Various Germanic tribes have inhabited the northern parts of modern Germany since classical antiquity. A region named Germania was documented before AD 100. In 962, the Kingdom of Germany formed the bulk of the Holy Roman Empire. During the 16th ce ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hemp
Hemp, or industrial hemp, is a botanical class of ''Cannabis sativa'' cultivars grown specifically for industrial or medicinal use. It can be used to make a wide range of products. Along with bamboo, hemp is among the fastest growing plants on Earth. It was also one of the first plants to be spun into usable fiber 50,000 years ago. It can be refined into a variety of commercial items, including paper, rope, textiles, clothing, biodegradable plastics, paint, insulation, biofuel, food, and animal feed. Although chemotype I cannabis and hemp (types II, III, IV, V) are both ''Cannabis sativa'' and contain the psychoactive component tetrahydrocannabinol (THC), they represent distinct cultivar groups, typically with unique phytochemical compositions and uses. Hemp typically has lower concentrations of total THC and may have higher concentrations of cannabidiol (CBD), which potentially mitigates the psychoactive effects of THC. The legality of hemp varies widely among countrie ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dams In The Harz
In the Harz mountains, there is a higher than average number of dams with their associated reservoirs. The reason is that the Harz is one of the regions with the heaviest rainfall in Germany and so its water power was utilised very early on. The first dam (on the Upper Harz Ponds) was built to drive water-powered pumps and stamp mills used in the mines. At present, the Harz reservoirs provide hydroelectricity, drinking water and flood protection particularly when the snows melt in spring. The following is a list of dams in the Harz: * Ecker Dam which impounds the waters of the Ecker * Grane Dam which impounds the waters of the Grane * Hassel Auxiliary Dam which impounds the waters of the Hassel, is part of the Rappbode Dam system * Innerste Dam which impounds the waters of the Innerste * Kelbra Dam which impounds the waters of the Helme * Königshütte Dam impounds the waters of both the Warme and Kalte Bode, and is part of the Rappbode Dam system * Mandelholz Dam (flood co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dams In Saxony-Anhalt
A dam is a barrier that stops or restricts the flow of surface water or underground streams. Reservoirs created by dams not only suppress floods but also provide water for activities such as irrigation, human consumption, industrial use, aquaculture, and navigability. Hydropower is often used in conjunction with dams to generate electricity. A dam can also be used to collect or store water which can be evenly distributed between locations. Dams generally serve the primary purpose of retaining water, while other structures such as floodgates or levees (also known as dikes) are used to manage or prevent water flow into specific land regions. The earliest known dam is the Jawa Dam in Jordan, dating to 3,000 BC. The word ''dam'' can be traced back to Middle English, and before that, from Middle Dutch, as seen in the names of many old cities, such as Amsterdam and Rotterdam. History Ancient dams Early dam building took place in Mesopotamia and the Middle East. Dams were used ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Reservoirs And Dams In Germany
These are dams and reservoirs in Germany. The German word ''Talsperre'' (literally: valley barrier) may mean dam, but it is often used to include the associated reservoir as well. The reservoirs are often separately given names ending in ''-see'', ''-teich'' or ''-speicher'' which are the German words for "lake", "pond" and "reservoir", but in this case all may also be translated as "reservoir". The more specific word for the actual dam is ''Staumauer'' and for the lake is ''Stausee''. Baden-Württemberg * Kleine Kinzig Dam *Nagold Dam *Schluchsee - highest reservoir lake in Germany and largest lake in the Black Forest * Schwarzenbach Dam Bavaria * Ellertshäuser See *Großer Brombachsee *Forggensee *Frauenau Dam *Sylvenstein Dam * Altmühlsee *Rothsee * Hahnenkammsee Brandenburg *Spremberg Reservoir Hesse *Aar Dam * Affoldern Reservoir * Antrift Dam * Diemelsee (reservoir) *Driedorf Reservoir *Edersee Lower Saxony * Ecker Dam * Grane Dam * Innerste Dam * Oder Dam * Oderteich ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Dams In The Harz
In the Harz mountains, there is a higher than average number of dams with their associated reservoirs. The reason is that the Harz is one of the regions with the heaviest rainfall in Germany and so its water power was utilised very early on. The first dam (on the Upper Harz Ponds) was built to drive water-powered pumps and stamp mills used in the mines. At present, the Harz reservoirs provide hydroelectricity, drinking water and flood protection particularly when the snows melt in spring. The following is a list of dams in the Harz: * Ecker Dam which impounds the waters of the Ecker * Grane Dam which impounds the waters of the Grane * Hassel Auxiliary Dam which impounds the waters of the Hassel, is part of the Rappbode Dam system * Innerste Dam which impounds the waters of the Innerste * Kelbra Dam which impounds the waters of the Helme * Königshütte Dam impounds the waters of both the Warme and Kalte Bode, and is part of the Rappbode Dam system * Mandelholz Dam (flood co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Harzer Wandernadel
The Harzer Wandernadel is a system of hiking awards in the Harz mountains in central Germany. The hiker (or mountain biker) can earn awards at different levels of challenge by walking to the various checkpoints in the network and stamping his or her passbook to record the visit. With 222 checkpoints in three federal states and across five districts in the Harz and with membership in five figures, the system has gained a following Germany-wide. Purpose The idea of the ''Wandernadel'' (literally "hiking needle/pin" --> "hiking badge") is to give those holidaying in the Harz a worthwhile goal to achieve and encourage them to stay for longer or return. It also aims to encourage those who live in the local area to go hiking and improve their fitness. In addition the system helps tourists and locals to get to know the many different sights and hiking trails in the Harz. To that end, checkpoints have been located at scenic viewing points, places of geological or botanical, culturalbo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Slate
Slate is a fine-grained, foliated, homogeneous metamorphic rock derived from an original shale-type sedimentary rock composed of clay or volcanic ash through low-grade regional metamorphism. It is the finest grained foliated metamorphic rock. Foliation may not correspond to the original sedimentary layering, but instead is in planes perpendicular to the direction of metamorphic compression. The foliation in slate is called "slaty cleavage". It is caused by strong compression causing fine grained clay flakes to regrow in planes perpendicular to the compression. When expertly "cut" by striking parallel to the foliation, with a specialized tool in the quarry, many slates will display a property called fissility, forming smooth flat sheets of stone which have long been used for roofing, floor tiles, and other purposes. Slate is frequently grey in color, especially when seen, en masse, covering roofs. However, slate occurs in a variety of colors even from a single locality; for ex ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Manganese
Manganese is a chemical element with the symbol Mn and atomic number 25. It is a hard, brittle, silvery metal, often found in minerals in combination with iron. Manganese is a transition metal with a multifaceted array of industrial alloy uses, particularly in stainless steels. It improves strength, workability, and resistance to wear. Manganese oxide is used as an oxidising agent; as a rubber additive; and in glass making, fertilisers, and ceramics. Manganese sulfate can be used as a fungicide. Manganese is also an essential human dietary element, important in macronutrient metabolism, bone formation, and free radical defense systems. It is a critical component in dozens of proteins and enzymes. It is found mostly in the bones, but also the liver, kidneys, and brain. In the human brain, the manganese is bound to manganese metalloproteins, most notably glutamine synthetase in astrocytes. Manganese was first isolated in 1774. It is familiar in the laboratory in the form of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Annular Piston Valve
{{Unreferenced, date=June 2019, bot=noref (GreenC bot) An angle seat piston valve is a pneumatically-controlled valve with a piston actuator providing linear actuation to lift a seal off its seat. The seat is set at an angle to provide the maximum possible flow when unseated. Angle seat piston valves are particularly suited to applications where high temperatures and large flow rates are required, such as steam or water. When used in reverse some models of angle seat piston valve will eliminate water hammer when operated. Operation Pneumatic valves are operated by a pilot medium under pressure, usually compressed air but also oil or water. The valve is equipped with a pneumatic actuator supplied by a three-way solenoid valve. The pressure of the pilot medium enters the actuator cylinder and acts on the piston, which allows the seal to open or to close through the stem. The return of the seal into its rest position is usually achieved by a return spring that can be found in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pendulum
A pendulum is a weight suspended from a pivot so that it can swing freely. When a pendulum is displaced sideways from its resting, equilibrium position, it is subject to a restoring force due to gravity that will accelerate it back toward the equilibrium position. When released, the restoring force acting on the pendulum's mass causes it to oscillate about the equilibrium position, swinging back and forth. The time for one complete cycle, a left swing and a right swing, is called the period. The period depends on the length of the pendulum and also to a slight degree on the amplitude, the width of the pendulum's swing. From the first scientific investigations of the pendulum around 1602 by Galileo Galilei, the regular motion of pendulums was used for timekeeping and was the world's most accurate timekeeping technology until the 1930s. The pendulum clock invented by Christiaan Huygens in 1658 became the world's standard timekeeper, used in homes and offices for 270 years, and ac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flexure
A flexure is a flexible element (or combination of elements) engineered to be compliant in specific degrees of freedom. Flexures are a design feature used by design engineers (usually mechanical engineers) for providing adjustment or compliance in a design. Flexure types Most compound flexure designs are composed of 3 fundamental types of flexure: * Pin flexure- a thin bar or cylinder of material, constrains 3 degrees of freedom when geometry matches a notch cutout. * Blade flexure- thin sheet of material, constrains 3 degrees of freedom. * Notch flexure- thin cutout on both sides of a thick piece of material, constrains 5 degrees of freedom Since single flexure features are limited both in travel capability and degrees of freedom available, compound flexure systems are designed using combinations of these component features. Using compound flexures, complex motion profiles with specific degrees of freedom and relatively long travel distances are possible. Design asp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
