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Leo Beranek
Leo Leroy Beranek (September 15, 1914 – October 10, 2016) was an American acoustics expert, former MIT professor, and a founder and former president of Bolt, Beranek and Newman (now BBN Technologies). He authored ''Acoustics'', considered a classic textbook in this field, and its updated and extended version published in 2012 under the title ''Acoustics: Sound Fields and Transducers''. He was also an expert in the design and evaluation of concert halls and opera houses, and authored the classic textbook ''Music, Acoustics, and Architecture'', revised and extended in 2004 under the title ''Concert Halls and Opera Houses: Music, Acoustics, and Architecture''. Early life and education Beranek was born in 1914 in Solon, Iowa. His father Edward Fred Beranek was a farmer whose ancestors came from Bohemia (in what is now the Czech Republic) and his mother Beatrice Stahle, previously a schoolteacher, had become a farmwife. Edward's paternal grandparents Josef Beránek and Anna Ši ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Solon, Iowa
Solon is a city located in Johnson County, Iowa, Johnson County, Iowa, United States. Part of the Iowa City, Iowa, Iowa City, Iowa Iowa City metropolitan area, Metropolitan Statistical Area, it is located a few miles from Lake MacBride State Park and the larger cities of Coralville, Iowa, Coralville and Iowa City. The population was 3,018 at the time of the 2020 United States Census, 2020 census. History Solon was platted in 1840. It is named for the classical Athenian statesman, lawmaker, and lyric poet Solon. Ironically, the local high school's mascot is the Spartans; Sparta was famously an enemy of Athens, Solon's home. The National Register of Historic Places-listed Stone Academy (Solon, Iowa), Stone Academy is just north of town. Geography According to the United States Census Bureau, the city has a total area of , all land. Demographics 2010 census As of the census of 2010, there were 2,037 people, 759 households, and 528 families living in the city. The population densit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Opera House
An opera house is a theatre building used for performances of opera. It usually includes a stage, an orchestra pit, audience seating, and backstage facilities for costumes and building sets. While some venues are constructed specifically for operas, other opera houses are part of larger performing arts centers. Indeed, the term ''opera house'' is often used as a term of prestige for any large performing-arts center. History Italy is a country where opera has been popular through the centuries among ordinary people as well as wealthy patrons and it continues to have many working opera houses such as Teatro Massimo in Palermo (the biggest in Italy), Teatro di San Carlo in Naples (the world's oldest working opera house) and Teatro La Scala in Milan. In contrast, there was no opera house in London when Henry Purcell was composing and the first opera house in Germany, the Oper am Gänsemarkt, was built in Hamburg in 1678, followed by the Oper am Brühl in Leipzig in 1693, and t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Model T
The Ford Model T is an automobile that was produced by Ford Motor Company from October 1, 1908, to May 26, 1927. It is generally regarded as the first affordable automobile, which made car travel available to middle-class Americans. The relatively low price was partly the result of Ford's efficient fabrication, including assembly line production instead of individual handcrafting. It was mainly designed by an American (Childe Harold Wills) and two Hungarian engineers ( Joseph A. Galamb, Eugene Farkas). The Model T was colloquially known as the "Tin Lizzie", "Leaping Lena" or "flivver". The Ford Model T was named the most influential car of the 20th century in the 1999 Car of the Century competition, ahead of the BMC Mini, Citroën DS, and Volkswagen Beetle. Ford's Model T was successful not only because it provided inexpensive transportation on a massive scale, but also because the car signified innovation for the rising middle class and became a powerful symbol of the Un ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Apprentice
Apprenticeship is a system for training a new generation of practitioners of a trade or profession with on-the-job training and often some accompanying study (classroom work and reading). Apprenticeships can also enable practitioners to gain a license to practice in a regulated occupation. Most of their training is done while working for an employer who helps the apprentices learn their trade or profession, in exchange for their continued labor for an agreed period after they have achieved measurable competencies. Apprenticeship lengths vary significantly across sectors, professions, roles and cultures. In some cases, people who successfully complete an apprenticeship can reach the "journeyman" or professional certification level of competence. In other cases, they can be offered a permanent job at the company that provided the placement. Although the formal boundaries and terminology of the apprentice/journeyman/master system often do not extend outside guilds and trade unions, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Correspondence Course
Distance education, also known as distance learning, is the education of students who may not always be physically present at a school, or where the learner and the teacher are separated in both time and distance. Traditionally, this usually involved correspondence courses wherein the student corresponded with the school via mail. Distance education is a technology mediated modality and has evolved with the evolution of technologies such as video conferencing, TV, and internet. Today, it usually involves online education and the learning is usually mediated by some form of technology. A distance learning program can be completely distance learning, or a combination of distance learning and traditional classroom instruction (called hybrid or blended). Other modalities include distance learning with complementary virtual environment or teaching in virtual environment (e-learning). Massive open online courses (MOOCs), offering large-scale interactive participation and open access ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hardware Store
Hardware stores (in a number of countries, "shops"), sometimes known as DIY stores, sell household hardware for home improvement including: fasteners, building materials, hand tools, power tools, keys, locks, hinges, chains, plumbing supplies, electrical supplies, cleaning products, housewares, tools, utensils, paint, and lawn and garden products directly to consumers for use at home or for business. Many hardware stores have specialty departments unique to its region or its owner's interests. These departments include hunting and fishing supplies, plants and nursery products, marine and boating supplies, pet food and supplies, farm and ranch supplies including animal feed, swimming pool chemicals, homebrewing supplies and canning supplies. The five largest hardware retailers in the world are The Home Depot, Lowe's (both in the United States), Kingfisher of the United Kingdom, Obi of Germany, and Leroy Merlin of France. United States Larger hardware stores may sell sma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stocking
Stockings (also known as hose, especially in a historical context) are close-fitting, variously elastic garments covering the leg from the foot up to the knee or possibly part or all of the thigh. Stockings vary in color, design, and transparency. Today, stockings are primarily worn for fashion and aesthetics, usually in association with mid-length or short skirts. History Historically, even though the word ''sock'' is at least as ancient in origin, what men normally wore were often referred to as stockings, probably especially when referring to longer hose. The word ''stock'' used to refer to the bottom "stump" part of the body, and by analogy the word was used to refer to the one-piece covering of the lower trunk and limbs of the 15th century—essentially tights consisting of the ''upper-stocks'' (later to be worn separately as knee breeches) and ''nether-stocks'' (later to be worn separately as ''stockings''). (See Hose.) Before the 1590s, stockings were made of woven cl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Silk
Silk is a natural protein fiber, some forms of which can be woven into textiles. The protein fiber of silk is composed mainly of fibroin and is produced by certain insect larvae to form cocoons. The best-known silk is obtained from the cocoons of the larvae of the mulberry silkworm ''Bombyx mori'' reared in captivity (sericulture). The shimmering appearance of silk is due to the triangular prism-like structure of the silk fibre, which allows silk cloth to refract incoming light at different angles, thus producing different colors. Silk is produced by several insects; but, generally, only the silk of moth caterpillars has been used for textile manufacturing. There has been some research into other types of silk, which differ at the molecular level. Silk is mainly produced by the larvae of insects undergoing complete metamorphosis, but some insects, such as webspinners and raspy crickets, produce silk throughout their lives. Silk production also occurs in hymenoptera ( bee ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vacuum Tube
A vacuum tube, electron tube, valve (British usage), or tube (North America), is a device that controls electric current flow in a high vacuum between electrodes to which an electric voltage, potential difference has been applied. The type known as a thermionic tube or thermionic valve utilizes thermionic emission of electrons from a hot cathode for fundamental electronic functions such as signal amplifier, amplification and current rectifier, rectification. Non-thermionic types such as a vacuum phototube, however, achieve electron emission through the photoelectric effect, and are used for such purposes as the detection of light intensities. In both types, the electrons are accelerated from the cathode to the anode by the electric field in the tube. The simplest vacuum tube, the diode (i.e. Fleming valve), invented in 1904 by John Ambrose Fleming, contains only a heated electron-emitting cathode and an anode. Electrons can only flow in one direction through the device—fro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tipton, Iowa
Tipton ( /ˈtɪptən/) is a city in Cedar County, Iowa, United States. The population was 3,149 at the time of the 2020 census. It is the county seat of Cedar County. History Tipton was platted within Center Township in 1840 and was named for General John Tipton, a personal friend of the founder, Henry W. Higgins. The city was incorporated on January 27, 1857. Geography Tipton is located at (41.770530, -91.129061). According to the United States Census Bureau, the city has a total area of , all land. Demographics 2000 census At the 2000 census there were 3,155 people, 1,334 households, and 868 families living in the city. The population density was . There were 1,404 housing units at an average density of . The racial makeup of the city was 98.61% White, 0.35% African American, 0.03% Native American, 0.32% Asian, 0.06% from other races, and 0.63% from two or more races. Hispanic or Latino of any race were 1.08%. Of the 1,334 households 29.5% had children under the age of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
One-room Schoolhouse
One-room schools, or schoolhouses, were commonplace throughout rural portions of various countries, including Prussia, Norway, Sweden, the United States, Canada, Australia, New Zealand, the United Kingdom, Ireland, and Spain. In most rural and small town schools, all of the students met in a single room. There, a single teacher taught academic basics to several grade levels of elementary-age children. While in many areas one-room schools are no longer used, some remain in developing nations and rural or remote areas. In the United States, the concept of a "little red schoolhouse" is a stirring one, and historic one-room schoolhouses have widely been preserved and are celebrated as symbols of frontier values and of local and national development. When necessary, the schools were enlarged or replaced with two-room schools. More than 200 are listed on the U.S. National Register of Historic Places. In Norway, by contrast, one-room schools were viewed more as impositions upon conse ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jarov (Plzeň-North District)
Jarov is a municipality and village in Plzeň-North District in the Plzeň Region of the Czech Republic. It has about 100 inhabitants. Jarov lies approximately north-east of Plzeň and west of Prague Prague ( ; cs, Praha ; german: Prag, ; la, Praga) is the capital and largest city in the Czech Republic, and the historical capital of Bohemia. On the Vltava river, Prague is home to about 1.3 million people. The city has a temperate .... References Villages in Plzeň-North District {{Plzeň-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
