National Register of Historic Places listings in Alaska
This is a list of properties and districts listed on the National Register of Historic Places in Alaska. There are 400 listed sites in Alaska; each of the state's 28 boroughs and census areas has at least two listings on the National Register, except for the Kusilvak Census Area, which has none. This National Park Service list is complete through NPS recent listings posted April 12, 2019; the following are approximate tallies of current listings in Alaska on the National Register of Historic Places. These counts are based on entries in the National Register Information Database as of April 24, 2008 and new weekly listings posted since on the National Register of Historic Places web site. There are frequent additions to the listings and occasional delistings, the counts here are not official; the counts in this table exclude boundary increase and decrease listings which modify the area covered by an existing property or district and which carry a separate National Register reference number. List of National Historic Landmarks in Alaska Aviation history in Alaska — National Register of Historic Places travel itinerary
A cleanroom or clean room is a facility ordinarily utilized as a part of specialized industrial production or scientific research, including the manufacture of pharmaceutical items and microprocessors. Cleanrooms are designed to maintain low levels of particulates, such as dust, airborne organisms, or vaporized particles. Cleanrooms have an cleanliness level quantified by the number of particles per cubic meter at a predetermined molecule measure; the ambient outdoor air in a typical urban area contains 35,000,000 particles for each cubic meter in the size range 0.5 μm and bigger in measurement, equivalent to an ISO 9 cleanroom, while by comparison an ISO 1 cleanroom permits no particles in that size range and just 12 particles for each cubic meter of 0.3 μm and smaller. The modern cleanroom was invented by American physicist Willis Whitfield; as employee of the Sandia National Laboratories, Whitfield created the initial plans for the cleanroom in 1960. Prior to Whitfield's invention, earlier cleanrooms had problems with particles and unpredictable airflows.
Whitfield designed his cleanroom with a constant filtered air flow to flush out impurities. Within a few years of its invention in the 1960s, Whitfield's modern cleanroom had generated more than US$50 billion in sales worldwide; the majority of the integrated circuit manufacturing facilities in Silicon Valley were made by three companies: MicroAire, PureAire, Key Plastics. These competitors made laminar flow units, glove boxes, clean rooms and air showers, along with the chemical tanks and benches used in the'Wet Process' building of integrated circuits; these three companies were the pioneers of the use of Teflon for airguns, chemical pumps, water guns, other devices needed for the production of integrated circuits. William C. McElroy Jr. worked as engineering manager, drafting room supervisor, QA/QC, designer for all three companies and his designs added 45 original patents to the technology of the time. McElroy wrote a four page article for MicroContamination Journal, wet processing training manuals, equipment manuals for wet processing and clean rooms.
Cleanrooms can be large. Entire manufacturing facilities can be contained within a cleanroom with factory floors covering thousands of square meters, they are used extensively in semiconductor manufacturing, the life sciences, other fields that are sensitive to environmental contamination. There are modular cleanrooms; the air entering a cleanroom from outside is filtered to exclude dust, the air inside is recirculated through high-efficiency particulate air and/or ultra-low particulate air filters to remove internally generated contaminants. Staff enter and leave through airlocks, wear protective clothing such as hoods, face masks, gloves and coveralls. Equipment inside the cleanroom is designed to generate minimal air contamination. Only special mops and buckets are used. Cleanroom furniture is easy to clean. Common materials such as paper and fabrics made from natural fibers are excluded, alternatives used. Cleanrooms are not sterile. Particle levels are tested using a particle counter and microorganisms detected and counted through environmental monitoring methods.
Polymer tools used in cleanrooms must be determined to be chemically compatible with cleanroom processing fluids as well as ensured to generate a low level of particle generation. Some cleanrooms are kept at a positive pressure so if any leaks occur, air leaks out of the chamber instead of unfiltered air coming in; some cleanroom HVAC systems control the humidity to such low levels that extra equipment like air ionizers are required to prevent electrostatic discharge problems. Low-level cleanrooms may only require special shoes, with smooth soles that do not track in dust or dirt. However, for safety reasons, shoe soles must not create slipping hazards. Access to a cleanroom is restricted to those wearing a cleanroom suit. In cleanrooms in which the standards of air contamination are less rigorous, the entrance to the cleanroom may not have an air shower. An anteroom is used to put on clean-room clothing; some manufacturing facilities do not use realized cleanrooms, but use some practices or technologies typical of cleanrooms to meet their contamination requirements.
In hospitals, theatres are similar to cleanrooms for surgical patients' operations with incisions to prevent any infections for the patient. Cleanrooms maintain particulate-free air through the use of either HEPA or ULPA filters employing laminar or turbulent air flow principles. Laminar, or unidirectional, air flow systems direct filtered air downward or in horizontal direction in a constant stream towards filters located on walls near the cleanroom floor or through raised perforated floor panels to be recirculated. Laminar air flow systems are employed across 80% of a cleanroom ceiling to maintain constant air processing. Stainless steel or other non shedding materials are used to construct laminar air flow filters and hoods to prevent excess particles entering the air. Turbulent, or non unidirectional, air flow uses both laminar air flow hoods and nonspecific velocity filters to keep air in a cleanroom in constant motion, although not all in the same direction; the rough air seeks to trap particles that may be in the air and drive them towards the floor, where they enter filters and leave the cleanroom environment.
US FDA and EU have laid down guidelines and limit for microbial contamination, s
Jet Propulsion Laboratory
The Jet Propulsion Laboratory is a federally funded research and development center and NASA field center in La Cañada Flintridge, United States, though it is referred to as residing in Pasadena, because it has a Pasadena ZIP Code. Founded in the 1930s, the JPL is owned by NASA and managed by the nearby California Institute of Technology for NASA; the laboratory's primary function is the construction and operation of planetary robotic spacecraft, though it conducts Earth-orbit and astronomy missions. It is responsible for operating NASA's Deep Space Network. Among the laboratory's major active projects are the Mars Science Laboratory mission, the Mars Reconnaissance Orbiter, the Juno spacecraft orbiting Jupiter, the NuSTAR X-ray telescope, the SMAP satellite for earth surface soil moisture monitoring, the Spitzer Space Telescope, it is responsible for managing the JPL Small-Body Database, provides physical data and lists of publications for all known small Solar System bodies. The JPL's Space Flight Operations Facility and Twenty-Five-Foot Space Simulator are designated National Historic Landmarks.
JPL traces its beginnings to 1936 in the Guggenheim Aeronautical Laboratory at the California Institute of Technology when the first set of rocket experiments were carried out in the Arroyo Seco. Caltech graduate students Frank Malina, Qian Xuesen, Weld Arnold, Apollo M. O. Smith, along with Jack Parsons and Edward S. Forman, tested a small, alcohol-fueled motor to gather data for Malina's graduate thesis. Malina's thesis advisor was engineer/aerodynamicist Theodore von Kármán, who arranged for U. S. Army financial support for this "GALCIT Rocket Project" in 1939. In 1941, Parsons, Martin Summerfield, pilot Homer Bushey demonstrated the first jet-assisted takeoff rockets to the Army. In 1943, von Kármán, Malina and Forman established the Aerojet Corporation to manufacture JATO rockets; the project took on the name Jet Propulsion Laboratory in November 1943, formally becoming an Army facility operated under contract by the university. During JPL's Army years, the laboratory developed two deployed weapon systems, the MGM-5 Corporal and MGM-29 Sergeant intermediate-range ballistic missiles.
These missiles were the first US ballistic missiles developed at JPL. It developed a number of other weapons system prototypes, such as the Loki anti-aircraft missile system, the forerunner of the Aerobee sounding rocket. At various times, it carried out rocket testing at the White Sands Proving Ground, Edwards Air Force Base, Goldstone, California. In 1954, JPL teamed up with Wernher von Braun's engineers at the Army Ballistic Missile Agency's Redstone Arsenal in Huntsville, Alabama, to propose orbiting a satellite during the International Geophysical Year; the team lost that proposal to Project Vanguard, instead embarked on a classified project to demonstrate ablative re-entry technology using a Jupiter-C rocket. They carried out three successful sub-orbital flights in 1956 and 1957. Using a spare Juno I, the two organizations launched the United States' first satellite, Explorer 1, on January 31, 1958. JPL was transferred to NASA in December 1958, becoming the agency's primary planetary spacecraft center.
JPL engineers designed and operated Ranger and Surveyor missions to the Moon that prepared the way for Apollo. JPL led the way in interplanetary exploration with the Mariner missions to Venus and Mercury. In 1998, JPL opened the Near-Earth Object Program Office for NASA; as of 2013, it has found 95% of asteroids that are a kilometer or more in diameter that cross Earth's orbit. JPL was early to employ female mathematicians. In the 1940s and 1950s, using mechanical calculators, women in an all-female computations group performed trajectory calculations. In 1961, JPL hired Dana Ulery as the first female engineer to work alongside male engineers as part of the Ranger and Mariner mission tracking teams. JPL has been recognized four times by the Space Foundation: with the Douglas S. Morrow Public Outreach Award, given annually to an individual or organization that has made significant contributions to public awareness of space programs, in 1998; when it was founded, JPL's site was west of a rocky flood-plain – the Arroyo Seco riverbed – above the Devil's Gate dam in the northwestern panhandle of the city of Pasadena.
While the first few buildings were constructed in land bought from the city of Pasadena, subsequent buildings were constructed in neighboring unincorporated land that became part of La Cañada Flintridge. Nowadays, most of the 177 acres of the U. S. federal government-owned NASA property that makes up the JPL campus is located in La Cañada Flintridge. Despite this, JPL still uses a Pasadena address as its official mailing address; the city of La Cañada Flintridge was incorporated in 1976, well after JPL attained international recognition as a Pasadena institution. There has been occasional rivalry between the two cities over the issue of which one should be mentioned in the media as the home of the laboratory. There are 6,000 full-time Caltech employees, a few thousand additional contractors working on any given day. NASA has a resident office at the facility staffed by federal managers who oversee JPL's activities and work for NASA. There are some Caltech graduate students, college student interns and co-op students.
The JPL Education Office serves educators and students by providi
National Register of Historic Places listings in Kentucky
This is a list of properties and historic districts in Kentucky that are listed on the National Register of Historic Places. There are listings in all of Kentucky's 120 counties; the locations of National Register properties and districts, may be seen in an online map by clicking on "Map of all coordinates". This National Park Service list is complete through NPS recent listings posted April 12, 2019; the following are approximate tallies of current listings by county. These counts are based on entries in the National Register Information Database as of April 24, 2008 and new weekly listings posted since on the National Register of Historic Places web site. There are frequent additions to the listings and occasional delistings and the counts here are approximate and not official. New entries are added to the official Register on a weekly basis; the counts in this table exclude boundary increase and decrease listings which only modify the area covered by an existing property or district, although carrying a separate National Register reference number.
List of National Historic Landmarks in Kentucky List of bridges on the National Register of Historic Places in Kentucky
National Register of Historic Places listings in Illinois
This is a list of properties and districts in Illinois that are on the National Register of Historic Places. There are over 1,800 in total. Of these, 85 are National Historic Landmarks. There are listings in all of the state's 102 counties; this National Park Service list is complete through NPS recent listings posted April 12, 2019. List of National Historic Landmarks in Illinois List of NRHP Multiple Property Submissions in Illinois List of archaeological sites on the National Register of Historic Places in Illinois List of bridges on the National Register of Historic Places in Illinois United States National Register of Historic Places listings
National Register of Historic Places listings in Louisiana
This is a list of properties and districts in Louisiana that are listed on the National Register of Historic Places. There are listings in each of Louisiana's 64 parishes; the locations of National Register properties and districts, may be seen in a map by clicking on "Map of all coordinates". The following are approximate tallies of current listings by parish; these counts are based on entries in the National Register Information Database as of April 24, 2008 and new weekly listings posted since on the National Register of Historic Places web site. There are frequent additions to the listings and occasional delistings and the counts here are approximate and not official. New entries are added to the official Register on a weekly basis; the counts in this table exclude boundary increase and decrease listings which only modify the area covered by an existing property or district, although carrying a separate National Register reference number. This National Park Service list is complete through NPS recent listings posted April 12, 2019.
List of National Historic Landmarks in Louisiana List of bridges on the National Register of Historic Places in Louisiana
National Park Service
The National Park Service is an agency of the United States federal government that manages all national parks, many national monuments, other conservation and historical properties with various title designations. It was created on August 25, 1916, by Congress through the National Park Service Organic Act and is an agency of the United States Department of the Interior; the NPS is charged with a dual role of preserving the ecological and historical integrity of the places entrusted to its management, while making them available and accessible for public use and enjoyment. As of 2018, the NPS employs 27,000 employees who oversee 419 units, of which 61 are designated national parks. National parks and national monuments in the United States were individually managed under the auspices of the Department of the Interior; the movement for an independent agency to oversee these federal lands was spearheaded by business magnate and conservationist Stephen Mather, as well as J. Horace McFarland. With the help of journalist Robert Sterling Yard, Mather ran a publicity campaign for the Department of the Interior.
They wrote numerous articles that praised the scenic and historic qualities of the parks and their possibilities for educational and recreational benefits. This campaign resulted in the creation of a National Park Service. On August 25, 1916, President Woodrow Wilson signed a bill that mandated the agency "to conserve the scenery and the natural and historic objects and wildlife therein, to provide for the enjoyment of the same in such manner and by such means as will leave them unimpaired for the enjoyment of future generations." Mather became the first director of the newly formed NPS. On March 3, 1933, President Herbert Hoover signed the Reorganization Act of 1933; the act would allow the President to reorganize the executive branch of the United States government. It wasn't until that summer when the new President, Franklin D. Roosevelt, made use of this power. Deputy Director Horace M. Albright had suggested to President Roosevelt that the historic sites from the American Civil War should be managed by the National Park Service, rather than the War Department.
President Roosevelt issued two Executive orders to make it happen. These two executive orders not only transferred to the National Park Service all the War Department historic sites, but the national monuments managed by the Department of Agriculture and the parks in and around the capital, run by an independent office. In 1951, Conrad Wirth became director of the National Park Service and went to work on bringing park facilities up to the standards that the public expected; the demand for parks after the end of the World War II had left the parks overburdened with demands that could not be met. In 1952, with the support of President Dwight D. Eisenhower, he began Mission 66, a ten-year effort to upgrade and expand park facilities for the 50th anniversary of the Park Service. New parks were added to preserve unique resources and existing park facilities were upgraded and expanded. In 1966, as the Park Service turned 50 years old, emphasis began to turn from just saving great and wonderful scenery and unique natural features to making parks accessible to the public.
Director George Hartzog began the process with the creation of the National Lakeshores and National Recreation Areas. Since its inception in 1916, the National Park Service has managed each of the United States' national parks, which have grown in number over the years to 60. Yellowstone National Park was the first national park in the United States. In 1872, there was no state government to manage it, so the federal government assumed direct control. Yosemite National Park began as a state park. Yosemite was returned to federal ownership. At first, each national park was managed independently, with varying degrees of success. In Yellowstone, the civilian staff was replaced by the U. S. Army in 1886. Due to the irregularities in managing these national treasures, Stephen Mather petitioned the federal government to improve the situation. In response, Secretary of the Interior Franklin K. Lane challenged him to lobby for creating a new agency, the National Park Service, to manage all national parks and some national monuments.
Mather was successful with the ratification of the National Park Service Organic Act in 1916. The agency was given authority over other protected areas, many with varying designations as Congress created them; the National Park System includes. The title or designation of a unit need not include the term park; the System as a whole is considered to be a national treasure of the United States, some of the more famous national parks and monuments are sometimes referred to metaphorically as "crown jewels". The system encompasses 84.4 million acres, of which more than 4.3 million acres remain in private ownership. The largest unit is Wrangell-St. Elias National Park and Preserve, Alaska. At 13,200,000 acres, it is over 16 percent of the entire system; the smallest unit in the system is Thaddeus Kosciuszko National Memorial, Pennsylvania, at 0.02 acre. In addition to administering its units and other properties, the National Park Service provides technical and financial assistance to several "affiliated areas" authorized by Congress.
The largest affiliated area is New Jersey Pinelands National Reserve at 1,164,025 acres. The smallest is Benjamin Franklin National Memorial at less than 0.01 acres. Although all units of the Nat