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Air Purifiers
An air purifier or air cleaner is a device which removes contaminants from the air in a room to improve indoor air quality. These devices are commonly marketed as being beneficial to allergy sufferers and asthmatics, and at reducing or eliminating second-hand tobacco smoke. The commercially graded air purifiers are manufactured as either small stand-alone units or larger units that can be affixed to an air handler unit (AHU) or to an HVAC unit found in the medical, industrial, and commercial industries. Air purifiers may also be used in industry to remove impurities from air before processing. Pressure swing adsorbers or other adsorption techniques are typically used for this. History In 1830, a patent was awarded to Charles Anthony Deane for a device comprising a copper helmet with an attached flexible collar and garment. A long leather hose attached to the rear of the helmet was to be used to supply air, the original concept being that it would be pumped using a double bellow ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Contaminant
Contamination is the presence of a constituent, impurity, or some other undesirable element that renders something unsuitable, unfit or harmful for the physical body, natural environment, wiktionary:Workplace, workplace, etc. Types of contamination Within the sciences, the word "contamination" can take on a variety of subtle differences in meaning, whether the contaminant is a solid or a liquid, as well as the variance of environment the contaminant is found to be in. A contaminant may even be more abstract, as in the case of an unwanted energy source that may interfere with a process. The following represent examples of different types of contamination based on these and other variances. Chemical contamination In chemistry, the term "contamination" usually describes a single constituent, but in specialized fields the term can also mean chemical mixtures, even up to the level of cellular materials. All chemicals contain some level of impurity. Contamination may be recognized or ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The Manufacturer And Builder
''The'' is a grammatical article in English, denoting nouns that are already or about to be mentioned, under discussion, implied or otherwise presumed familiar to listeners, readers, or speakers. It is the definite article in English. ''The'' is the most frequently used word in the English language; studies and analyses of texts have found it to account for seven percent of all printed English-language words. It is derived from gendered articles in Old English which combined in Middle English and now has a single form used with nouns of any gender. The word can be used with both singular and plural nouns, and with a noun that starts with any letter. This is different from many other languages, which have different forms of the definite article for different genders or numbers. Pronunciation In most dialects, "the" is pronounced as (with the voiced dental fricative followed by a schwa) when followed by a consonant sound, and as (homophone of the archaic pronoun ''thee' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pollen
Pollen is a powdery substance produced by most types of flowers of seed plants for the purpose of sexual reproduction. It consists of pollen grains (highly reduced Gametophyte#Heterospory, microgametophytes), which produce male gametes (sperm cells). Pollen grains have a hard coat made of sporopollenin that protects the gametophytes during the process of their movement from the stamens to the pistil of flowering plants, or from the male Conifer cone, cone to the female cone of gymnosperms. If pollen lands on a compatible pistil or female cone, it Germination, germinates, producing a pollen tube that transfers the sperm to the ovule containing the female gametophyte. Individual pollen grains are small enough to require magnification to see detail. The study of pollen is called palynology and is highly useful in paleoecology, paleontology, archaeology, and Forensic science, forensics. Pollen in plants is used for transferring Ploidy#Haploid and monoploid, haploid male genetic ma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dust
Dust is made of particle size, fine particles of solid matter. On Earth, it generally consists of particles in the atmosphere that come from various sources such as soil lifted by wind (an aeolian processes, aeolian process), Types of volcanic eruptions, volcanic eruptions, and pollution. Dust in homes is composed of about 20–50% dead skin Cell (biology), cells. The rest, and in offices and other built environments, is composed of small amounts of plant pollen, human hairs, animal fur, textile fibers, paper fibers, minerals from outdoor soil, burnt meteorite particles, and many other materials which may be found in the local environment. Atmospheric Atmospheric or wind-borne fugitive dust, also known as ''aeolian dust'', comes from dry regions where high-speed winds can remove mostly silt-sized material, abrading susceptible surfaces. This includes areas where grazing, ploughing, vehicle use, and other human behaviors have further destabilized the land, though not all so ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
IQAir
IQAir is a Swiss air quality technology company, specializing in protection against airborne pollutants, developing air quality monitoring and air cleaning products. IQAir also operates AirVisual, a real-time air quality information platform. As of February 2020, it had around 500 employees worldwide, 150 of them in China, and its most important markets were Asia and North America. History IQAir was founded in 1963 by brothers Manfred and Klaus Hammes, who introduced an air filter system for residential coal ovens in Germany to help reduce black dust build-up on the walls behind ovens. Manfred Hammes, a lifelong asthma sufferer, noticed that the filter reduced his flare-ups during the winter months. Klaus Hammes continued through the 1960s and '70s, to adapt the air filter for other heating systems such as radiators, baseboard heating and forced-air heating and cooling systems. In 1982, Klaus Hammes relocated the company headquarters to Switzerland. In the early 1990s, Frank ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Architectural Design
Building design, also called architectural design, refers to the broadly based architectural, engineering and technical applications to the design of buildings. All building projects require the services of a building designer, typically a licensed architect. Smaller, less complicated projects often do not require a licensed professional, and the design of such projects is often undertaken by building designers, draftspersons, interior designers (for interior fit-outs or renovations), or contractors. Larger, more complex building projects require the services of many professionals trained in specialist disciplines, usually coordinated by an architect. Occupations Architect An architect is a person trained in the planning, design and supervision of the construction of buildings. Professionally, an architect's decisions affect public safety, and thus an architect must undergo specialized training consisting of advanced education and a practicum (or internship) for practical e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jefferson, North Carolina
Jefferson is a town in and the county seat of Ashe County, North Carolina, United States. At the 2020 census, the population was 1,622. History The North Carolina General Assembly created a special commission in 1799 to found a county seat for Ashe County. The commission purchased of land to form the town of Jeffersonton, later named Jefferson. It is one of the first towns in the nation to bear the name of Thomas Jefferson, who was the vice president of the United States in 1799. The Ashe County Courthouse and Poe Fish Weir are listed on the National Register of Historic Places. Geography Jefferson is located in the Appalachian Mountains. According to the United States Census Bureau, the town has a total area of , of which , or 0.20%, is water. The New River, which is part of the Ohio River watershed and one of the oldest and most scenic rivers in the eastern United States, flows through the town. Climate Due to its high elevation, Jefferson has a subtropical highland c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
McFarland & Company
McFarland & Company, Inc., is an American independent book publisher based in Jefferson, North Carolina, that specializes in academic An academy (Attic Greek: Ἀκαδήμεια; Koine Greek Ἀκαδημία) is an institution of tertiary education. The name traces back to Plato's school of philosophy, founded approximately 386 BC at Akademia, a sanctuary of Athena, the go ... and reference works, as well as general-interest adult nonfiction. Its president is Rhonda Herman. Its current Editor-in-Chief is Steve Wilson. Its former president and current President Emeritus is Robert Franklin, who founded the company in 1979. McFarland employs a staff of about 50, and had published 7,800 titles. McFarland's initial print runs average 600 copies per book. Subject matter McFarland & Company focuses mainly on selling to libraries. It also utilizes direct mailing to connect with enthusiasts in niche categories. The company is known for its sports literature, especially ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thousand Oaks, California
Thousand Oaks is the second-largest city in Ventura County, California, located in the northwestern part of Greater Los Angeles. Approximately from the city of Los Angeles and from Downtown Los Angeles, it is named after the many oak trees present in the area. The city forms the central populated core of the Conejo Valley. Thousand Oaks was incorporated in 1964 and has since expanded to the west and east. Two-thirds of the master-planned community surrounding Westlake Lake, Westlake and most of Newbury Park, California, Newbury Park were annexed by the city during the late 1960s and 1970s. The Los Angeles County, California, Los Angeles County–Ventura County line forms the city's eastern border with the city of Westlake Village, California, Westlake Village. The population was 126,966 at the 2020 United States census, 2020 census, up from 126,683 at the 2010 United States Census, 2010 census. History Etymology One of the earliest names used for the area was Conejo Mountai ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
SAGE Publishing
Sage Publishing, formerly SAGE Publications, is an American Independent business, independent Academic publishing, academic publishing company, founded in 1965 in New York City by Sara Miller McCune and now based in the Newbury Park, California, Newbury Park neighborhood of Thousand Oaks, California. Sage Publishing has offices located across North America, Europe, and the Asia Pacific region. In North America, Sage Publishing has offices in Los Angeles, Washington DC, and Toronto. The European operations are headquartered in London, London, United Kingdom. In the Asia Pacific region, Sage Publishing has established offices in Melbourne, Australia, India and Singapore. It publishes more than 1,000 journals, more than 800 books a year, reference works and electronic products covering business, humanities, social sciences, science, technology and medicine. SAGE also owns and publishes under the imprints of Corwin Press (since 1990), CQ Press (since 2008), Learning Matters (since ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radioactive Decay
Radioactive decay (also known as nuclear decay, radioactivity, radioactive disintegration, or nuclear disintegration) is the process by which an unstable atomic nucleus loses energy by radiation. A material containing unstable nuclei is considered ''radioactive''. Three of the most common types of decay are Alpha decay, alpha, Beta decay, beta, and Gamma ray, gamma decay. The weak force is the Fundamental interactions, mechanism that is responsible for beta decay, while the other two are governed by the electromagnetic force, electromagnetic and nuclear forces. Radioactive decay is a randomness, random process at the level of single atoms. According to quantum mechanics, quantum theory, it is impossible to predict when a particular atom will decay, regardless of how long the atom has existed. However, for a significant number of identical atoms, the overall decay rate can be expressed as a decay constant or as a half-life. The half-lives of radioactive atoms have a huge range: f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Manhattan Project
The Manhattan Project was a research and development program undertaken during World War II to produce the first nuclear weapons. It was led by the United States in collaboration with the United Kingdom and Canada. From 1942 to 1946, the project was directed by Major General Leslie Groves of the United States Army Corps of Engineers, U.S. Army Corps of Engineers. Nuclear physicist J. Robert Oppenheimer was the director of the Los Alamos Laboratory that designed the bombs. The Army program was designated the Manhattan District, as its first headquarters were in Manhattan; the name gradually superseded the official codename, Development of Substitute Materials, for the entire project. The project absorbed its earlier British counterpart, Tube Alloys, and subsumed the program from the American civilian Office of Scientific Research and Development. The Manhattan Project employed nearly 130,000 people at its peak and cost nearly US$2 billion (equivalent to about $ b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
