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HandWiki is the world's largest wiki-style encyclopedia dedicated to science, technology and computing. It allows you to create and edit articles as long as you have external citations and login account. In addition, this is a content management environment that can be used for collaborative editing of original scholarly content, such as books, manuals, monographs and tutorials.

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Helianthus Annuus
Helianthus annuus, the common sunflower, is a large annual forb of the genus Helianthus grown as a crop for its edible oil and edible fruits. This sunflower species is also used as wild bird food, as livestock forage (as a meal or a silage plant), in some industrial applications, and as an ornamental in domestic gardens. The plant was first domesticated in the Americas. Wild Helianthus annuus is a widely branched annual plant with many flower heads. The domestic sunflower, however, often possesses only a single large inflorescence (flower head) atop an unbranched stem. The name sunflower may derive from the flower's head's shape, which resembles the sun. Sunflower seeds were brought to Europe from the Americas in the 16th century, where, along with sunflower oil, they became a widespread cooking ingredient.
  • 3.4K
  • 19 Oct 2022
Topic Review
Slope Stability Analysis
Slope stability analysis is performed to assess the safe design of a human-made or natural slopes (e.g. embankments, road cuts, open-pit mining, excavations, landfills etc.) and the equilibrium conditions. Slope stability is the resistance of inclined surface to failure by sliding or collapsing. The main objectives of slope stability analysis are finding endangered areas, investigation of potential failure mechanisms, determination of the slope sensitivity to different triggering mechanisms, designing of optimal slopes with regard to safety, reliability and economics, designing possible remedial measures, e.g. barriers and stabilization. Successful design of the slope requires geological information and site characteristics, e.g. properties of soil/rock mass, slope geometry, groundwater conditions, alternation of materials by faulting, joint or discontinuity systems, movements and tension in joints, earthquake activity etc. The presence of water has a detrimental effect on slope stability. Water pressure acting in the pore spaces, fractures or other discontinuities in the materials that make up the pit slope will reduce the strength of those materials. Choice of correct analysis technique depends on both site conditions and the potential mode of failure, with careful consideration being given to the varying strengths, weaknesses and limitations inherent in each methodology. Before the computer age stability analysis was performed graphically or by using a hand-held calculator. Today engineers have a lot of possibilities to use analysis software, ranges from simple limit equilibrium techniques through to computational limit analysis approaches (e.g. Finite element limit analysis, Discontinuity layout optimization) to complex and sophisticated numerical solutions (finite-/distinct-element codes). The engineer must fully understand limitations of each technique. For example, limit equilibrium is most commonly used and simple solution method, but it can become inadequate if the slope fails by complex mechanisms (e.g. internal deformation and brittle fracture, progressive creep, liquefaction of weaker soil layers, etc.). In these cases more sophisticated numerical modelling techniques should be utilised. Also, even for very simple slopes, the results obtained with typical limit equilibrium methods currently in use (Bishop, Spencer, etc.) may differ considerably. In addition, the use of the risk assessment concept is increasing today. Risk assessment is concerned with both the consequence of slope failure and the probability of failure (both require an understanding of the failure mechanism). Within the last decade (2003) Slope Stability Radar has been developed to remotely scan a rock slope to monitor the spatial deformation of the face. Small movements of a rough wall can be detected with sub-millimeter accuracy by using interferometry techniques.
  • 8.4K
  • 19 Oct 2022
Topic Review
Church of Our Father (Atlanta)
Church of Our Father was the first Unitarian church established in Atlanta, Georgia. The church was organized on March 27, 1883, by Rev. George Leonard Chaney, a Boston minister. Rev. Chaney initially held Sunday services in the Senate Chamber, Concordia Hall and the United States Courtroom. A church building was constructed at the corner of North Forsyth and Church Street and dedicated on April 23, 1884. The original building was demolished in 1900. The church continued to serve Atlanta's liberal religious community for more than six decades. During that time the church name was changed several times. In 1918, Atlanta's Unitarians merged with the city's Universalist congregation. The combined congregation collapsed in 1951.
  • 990
  • 20 Oct 2022
Topic Review
NUAA UAV
NUAA UAVs are Chinese UAVs developed by Nanjing University of Aeronautics and Astronautics (NUAA), and most of which are experimental UAV, but some of which have entered limited service in China.
  • 967
  • 19 Oct 2022
Topic Review
Ras Al Khaimah
Ras Al Khaimah (Arabic: رأس الخيمة; IPA: [raʔs alˈxajma]), historically known as Julfar, is one of the seven emirates that make up the United Arab Emirates (UAE). The capital city and home of most residents is also called Ras Al Khaimah, sometimes abbreviated as RAK city. Its name could be taken to mean "headland of the small huts", which can be attributed to the indigenous buildings that existed along the coast. The emirate is in the northern part of the UAE, bordering Oman's exclave of Musandam. It covers an area of 2,486 km2 (960 sq mi). The emirate had a population of 210,063 at the 2005 Census, of which 41.82 percent or 87,848 were Emirati citizens. Latest estimates put the total population at between 250,000 and 300,000. Locals accounted for 97,529 in the population estimate for 2010. Its capital city RAK city has two main sections, Old Ras Al Khaimah and Nakheel, on either side of a creek. It is served by the Ras Al Khaimah International Airport. It consists of a northern part (where the city of Ras al-Khaimah is situated), and a large inland exclave in the south (near Hatta), and a few small islands in the Persian Gulf. Ras Al Khaimah has the most fertile soil in the country, due to a larger share in rainfall and underground water streams from Omani mountains.
  • 5.7K
  • 19 Oct 2022
Topic Review
Privacy Concerns with Facebook
Meta Platforms Inc., or Meta for short, (formerly known as Facebook) has faced a number of privacy concerns. These stem partly from the company’s revenue model that involves selling information collected about its users for many things including advertisement targeting. Meta Platforms Inc. has also been a part of many data breaches that have occurred within the company. These issues and others are further described including user data concerns, vulnerabilities in the company’s platform, investigations by pressure groups and government agencies, and even issues with students. In addition, employers and other organizations/individuals have been known to use Meta Platforms Inc. for their own purposes. As a result, individuals’ identities and private information have sometimes been compromised without their permission. In response to these growing privacy concerns, some pressure groups and government agencies have increasingly asserted the users’ right to privacy and to be able to control their personal data.
  • 4.7K
  • 19 Oct 2022
Topic Review
Tendinosis
Tendinosis means and is sometimes called chronic tendinitis, chronic tendinopathy, or chronic tendon injury. It is damage to a tendon at a cellular level (the suffix "osis" implies a pathology of chronic degeneration without inflammation). It is thought to be caused by microtears in the connective tissue in and around the tendon, leading to an increase in tendon repair cells. This may lead to reduced tensile strength, thus increasing the chance of tendon rupture. Tendinosis is often misdiagnosed as tendinitis because of the limited understanding of tendinopathies by the medical community. Classic characteristics of "tendinosis" include degenerative changes in the collagenous matrix, hypercellularity, hypervascularity, and a lack of inflammatory cells which has challenged the original misnomer "tendinitis".
  • 1.3K
  • 25 Oct 2022
Topic Review
Newgrounds
Newgrounds (collectively Newgrounds.com, Inc.) is an American online entertainment and social media website and company. It hosts user-generated content such as gaming, filming, audio and artwork composition in four respective website categories. While AOL and Geocities had statically hosted user-generated content, Newgrounds provided visitor-driven voting and ranking of user-generated animations. The site's founder and owner, Thomas "Tom" Fulp, founded the site and company in 1995 and produces in-house content over at the headquarters and offices, based in the Glenside neighborhood of Cheltenham Township, Pennsylvania.
  • 4.1K
  • 19 Oct 2022
Topic Review
Chrysler Town & Country
The Chrysler Town & Country is a minivan that was manufactured and marketed by Chrysler. It was introduced in 1989 for the 1990 model year. The Chrysler group minivans, which include the Dodge Caravan/Dodge Grand Caravan and included the Plymouth Voyager/Plymouth Grand Voyager/Chrysler Voyager, have ranked as the 13th bestselling automotive nameplates worldwide, with over 12 million sold. After five generations and 27 model year runs, the Town & Country nameplate was retired at the end of the 2016 model year run and was replaced by the 2017 model-year Chrysler Pacifica.
  • 2.7K
  • 19 Oct 2022
Topic Review
Firearm (Tool)
A firearm is primarily a weapon, but can be used as a tool to project either single or multiple objects at high velocity through a controlled explosion. The firing is achieved by the gases produced through rapid, confined burning of a propellant. This process of rapid burning is technically known as deflagration. In older firearms, this propellant was typically black powder, but modern firearms use smokeless powder, cordite, or other propellants. Many firearms such as mortars do not have rifled bores to impart spin to the projectile for improved flight stability, such as is seen with firearms used as weapons, although some are rifled. The lack of rifling can prevent tangling of grappling hook lines, buoy lines, and such, although some firearms intended for use at the longest ranges in these applications are rifled.
  • 1.4K
  • 19 Oct 2022
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