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Screw Mechanism
The screw is a mechanism that converts rotational motion to linear motion, and a torque (rotational force) to a linear force. It is one of the six classical simple machines. The most common form consists of a cylindrical shaft with helical grooves or ridges called '' threads'' around the outside. The screw passes through a hole in another object or medium, with threads on the inside of the hole that mesh with the screw's threads. When the shaft of the screw is rotated relative to the stationary threads, the screw moves along its axis relative to the medium surrounding it; for example rotating a wood screw forces it into wood. In screw mechanisms, either the screw shaft can rotate through a threaded hole in a stationary object, or a threaded collar such as a nut can rotate around a stationary screw shaft. Geometrically, a screw can be viewed as a narrow inclined plane wrapped around a cylinder. Like the other simple machines a screw can amplify force; a small rotational forc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vise
A vise or vice (British English) is a mechanical apparatus used to secure an object to allow work to be performed on it. Vises have two parallel jaws, one fixed and the other movable, threaded in and out by a screw and lever. The jaws are often flat but may have grooves, adapt to the shape of the workpiece or be custom made. A vise grip is not a vise but a pair of lever-actuated locking pliers. Etymology The etymology of ''vise'' can be tracked via Middle English ''vys'' Anglo-French ''vyz'' from Latin ''vitis'' "vine". The tight grip of the mechanical device was likened to that of the twines of the plant. Types Face A face vise is the standard woodworking vise, always securely attached to a workbench flush with its work surface. Its jaws are made of wood or metal, the latter usually faced with wood, called cheeks, to avoid marring the work. The movable jaw may include a retractable dog to hold work against a bench dog. A "quick-release" woodworker's vise employs a split ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Screw Pump
A screw pump is a positive-displacement pump that use one or several screws to move fluid solids or liquids along the screw(s) axis. History The screw pump is the oldest positive displacement pump. The first records of a water screw, or screw pump, dates back to Ancient Egypt before the 3rd century BC. The Egyptian screw, used to lift water from the Nile, was composed of tubes wound round a cylinder; as the entire unit rotates, water is lifted within the spiral tube to the higher elevation. A later screw pump design from Egypt had a spiral groove cut on the outside of a solid wooden cylinder and then the cylinder was covered by boards or sheets of metal closely covering the surfaces between the grooves. A cuneiform inscription of Assyrian king Sennacherib (704–681 BC) has been interpreted by Stephanie DalleyStephanie Dalley, ''The Mystery of the Hanging Garden of Babylon: an elusive World Wonder traced'', (2013), OUP to describe casting water screws in bronze some 350 years ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Water Screw
A screw pump is a positive-displacement pump that use one or several screws to move fluid solids or liquids along the screw(s) axis. History The screw pump is the oldest positive displacement pump. The first records of a water screw, or screw pump, dates back to Ancient Egypt before the 3rd century BC. The Egyptian screw, used to lift water from the Nile, was composed of tubes wound round a cylinder; as the entire unit rotates, water is lifted within the spiral tube to the higher elevation. A later screw pump design from Egypt had a spiral groove cut on the outside of a solid wooden cylinder and then the cylinder was covered by boards or sheets of metal closely covering the surfaces between the grooves. A cuneiform inscription of Assyrian king Sennacherib (704–681 BC) has been interpreted by Stephanie DalleyStephanie Dalley, ''The Mystery of the Hanging Garden of Babylon: an elusive World Wonder traced'', (2013), OUP to describe casting water screws in bronze some 350 years ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ancient Greece
Ancient Greece () was a northeastern Mediterranean civilization, existing from the Greek Dark Ages of the 12th–9th centuries BC to the end of classical antiquity (), that comprised a loose collection of culturally and linguistically related city-states and communities. Prior to the Roman period, most of these regions were officially unified only once under the Kingdom of Macedon from 338 to 323 BC. In Western history, the era of classical antiquity was immediately followed by the Early Middle Ages and the Byzantine period. Three centuries after the decline of Mycenaean Greece during the Bronze Age collapse, Greek urban poleis began to form in the 8th century BC, ushering in the Archaic period and the colonization of the Mediterranean Basin. This was followed by the age of Classical Greece, from the Greco-Persian Wars to the death of Alexander the Great in 323 BC, and which included the Golden Age of Athens and the Peloponnesian War. The u ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ancient Egypt
Ancient Egypt () was a cradle of civilization concentrated along the lower reaches of the Nile River in Northeast Africa. It emerged from prehistoric Egypt around 3150BC (according to conventional Egyptian chronology), when Upper and Lower Egypt were amalgamated by Menes, who is believed by the majority of List of Egyptologists, Egyptologists to have been the same person as Narmer. The history of ancient Egypt unfolded as a series of stable kingdoms interspersed by the "Periodization of ancient Egypt, Intermediate Periods" of relative instability. These stable kingdoms existed in one of three periods: the Old Kingdom of Egypt, Old Kingdom of the Early Bronze Age; the Middle Kingdom of Egypt, Middle Kingdom of the Middle Bronze Age; or the New Kingdom of Egypt, New Kingdom of the Late Bronze Age. The pinnacle of ancient Egyptian power was achieved during the New Kingdom, which extended its rule to much of Nubia and a considerable portion of the Levant. After this period, Egypt ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eisenbrauns
Eisenbrauns, an imprint of Penn State University Press, is an academic publisher specializing in the ancient Near East and biblical studies. They publish approximately twenty new books and reference works each year, as well as reprinting out-of-print books relating to biblical studies. Eisenbrauns was founded by Jim and Merna Eisenbraun in 1975 in Ann Arbor, Michigan. Jim, a graduate at Ann Arbor, was tired of paying high prices for specialized books. He paid the legal fee to operate a bookstore and gained access to retailers' prices. The store quickly gained traction and moved to a 4,000 square feet building in 1978. It operated for over forty years in Winona Lake, Indiana, and Warsaw, Indiana before its acquisition by Penn State University Press The Penn State University Press, also known as The Pennsylvania State University Press, is a non-profit publisher of scholarly books and journals. Established in 1956, it is the independent publishing branch of the Pennsylvania ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neo-Assyrian
The Neo-Assyrian Empire was the fourth and penultimate stage of ancient Assyrian history. Beginning with the accession of Adad-nirari II in 911 BC, the Neo-Assyrian Empire grew to dominate the ancient Near East and parts of South Caucasus, North Africa and East Mediterranean throughout much of the 9th to 7th centuries BC, becoming the largest empire in history up to that point. Because of its geopolitical dominance and ideology based in world domination, the Neo-Assyrian Empire has been described as the first world empire in history. It influenced other empires of the ancient world culturally, administratively, and militarily, including the Neo-Babylonians, the Achaemenids, and the Seleucids. At its height, the empire was the strongest military power in the world and ruled over all of Mesopotamia, the Levant and Egypt, as well as parts of Anatolia, Arabia and modern-day Iran and Armenia. The early Neo-Assyrian kings were chiefly concerned with restoring Assyrian contro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mesopotamia
Mesopotamia is a historical region of West Asia situated within the Tigris–Euphrates river system, in the northern part of the Fertile Crescent. Today, Mesopotamia is known as present-day Iraq and forms the eastern geographic boundary of the modern Middle East. Just beyond it lies southwestern Iran, where the region transitions into the Iranian plateau, Persian plateau, marking the shift from the Arab world to Iran. In the broader sense, the historical region of Mesopotamia also includes parts of present-day Iran (southwest), Turkey (southeast), Syria (northeast), and Kuwait. Mesopotamia is the site of the earliest developments of the Neolithic Revolution from around 10,000 BC. It has been identified as having "inspired some of the most important developments in human history, including the invention of the wheel, the planting of the first cereal crops, the development of cursive script, mathematics, astronomy, and agriculture". It is recognised as the cradle of some of t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Restored Olive Press From The Roman Empire
''Restored'' is the fourth studio album by American contemporary Christian musician Jeremy Camp. It was released on November 16, 2004, by BEC Recordings. Track listing Standard release Enhanced edition Deluxe gold edition Standard Australian release Personnel * Jeremy Camp – lead and backing vocals, acoustic guitar (1–3, 5–8, 10, 12) * Andy Dodd – keyboards and programming (1, 3, 7, 9, 10, 12), electric guitar (1, 3, 7, 9, 10, 12) * Adam Watts – keyboards and programming (1, 3, 9), drums (1, 3, 7, 9, 10, 12), additional electric guitar outro (12) * Aaron Sprinkle – keyboards (2, 4, 5, 11), programming (2, 4, 8), electric guitar (2, 4–6, 8, 11), percussion (2, 4–6, 8, 11), bass (4), Rhodes (8) * Zach Hodges – acoustic piano (6) * Dave Van Liew – electric guitar solo (8), electric guitar (11) * Nic Rodriguez – bass (1, 3, 7, 9, 10, 12) * Nick Barber – bass (2, 5, 6, 8, 11) * Joey Sanchez – drums (2, 4–6, 8, 11) * Cameron Stone – cello ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Helix
A helix (; ) is a shape like a cylindrical coil spring or the thread of a machine screw. It is a type of smooth space curve with tangent lines at a constant angle to a fixed axis. Helices are important in biology, as the DNA molecule is formed as two intertwined helices, and many proteins have helical substructures, known as alpha helices. The word ''helix'' comes from the Greek word , "twisted, curved". A "filled-in" helix – for example, a "spiral" (helical) ramp – is a surface called a '' helicoid''. Properties and types The pitch of a helix is the height of one complete helix turn, measured parallel to the axis of the helix. A double helix consists of two (typically congruent) helices with the same axis, differing by a translation along the axis. A circular helix (i.e. one with constant radius) has constant band curvature and constant torsion. The slope of a circular helix is commonly defined as the ratio of the circumference of the circular cylinder that it ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Archimedes' Screw
The Archimedes' screw, also known as the Archimedean screw, hydrodynamic screw, water screw or Egyptian screw, is one of the earliest documented hydraulic machines. It was so-named after the Greek mathematician Archimedes who first described it around 234 BC, although the device had been developed in Egypt earlier in the century. It is a reversible hydraulic machine that can be operated both as a pump or a power generator. As a machine used for lifting water from a low-lying body of water into irrigation ditches, water is lifted by turning a screw-shaped surface inside a pipe. In the modern world, Archimedes screw pumps are widely used in wastewater treatment plants and for dewatering low-lying regions. Run in reverse, Archimedes screw turbines act as a new form of small hydroelectric powerplant that can be applied even in low head sites. Such generators operate in a wide range of flows (0.01 m^3/s to 14.5 m^3/s) and heads (0.1 m to 10 m), including low heads and moderate flow ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
