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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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BFR Spaceship
The Big Falcon Rocket (officially shortened to BFR) is a privately funded fully reusable launch vehicle and spacecraft system in development by SpaceX. The overall space vehicle architecture includes both launch vehicles and spacecraft, as well as ground infrastructure for rapid launch and relaunch, and zero-gravity propellant transfer technology to be deployed in low Earth orbit (LEO). The payload capacity to Earth orbit of at least 100,000 kg (220,000 lb) makes BFR a super heavy-lift launch vehicle. The first orbital flight is tentatively planned for 2020. SpaceX has been developing a super heavy-lift launch vehicle for many years, with the exact design and nomenclature of the vehicle undergoing multiple revisions over time. Before 2016, the vehicle was referred to as the Mars Colonial Transporter (MCT), though very few details about the design of the MCT were ever made public. Starting from 2016, SpaceX began sharing annual updates with the public, detailing the designs and uses of their upcoming new launch vehicle. In 2016, SpaceX CEO Elon Musk presented the vehicle at the International Astronautical Congress as the ITS launch vehicle, forming a core part of Musk's comprehensive vision for an Interplanetary Transport System (ITS). The ITS vehicle had a 12-meter (39 ft) core diameter, but was only intended for interplanetary travel. In September 2017, the design (now known as the BFR) was scaled down to 9 meters (30 ft) While the ITS had been solely aimed at Mars transit and other interplanetary uses, SpaceX pivoted to a plan that would support all SpaceX launch service provider capabilities with a single set of 9-meter vehicles: Earth orbit, lunar orbit, Interplanetary spaceflight, and potentially, even intercontinental passenger transport on Earth. In September 2018, a redesign of the second stage was announced, adding steerable canards, two radially adjustable fins also acting as landing legs, and a third leg that looks like a vertical stabilizer but has no aerodynamic function due to the special re-entry profile of the spacecraft. The launch vehicle design is dependent on the concurrent development work on the Raptor rocket engines, which are cryogenic methalox-fueled engines to be used for both stages of the BFR launch vehicle. Development on the Raptor began in 2012, leading to engine testing which began in 2016. The BFR system is intended to completely replace all of SpaceX's existing space hardware (the Falcon 9 and Falcon Heavy launch vehicles, and the Dragon spacecraft), initially aiming at the Earth-orbit launch market, but explicitly adding substantial capability to support long-duration spaceflight in the cislunar and Mars transport flight environments.
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  • 14 Oct 2022
Topic Review
Dagor Dagorath
The Dagor Dagorath (Sindarin for Battle of Battles) is a fictional battle described in the legendarium of J. R. R. Tolkien. As Tolkien's works were conceived as a fictional "forgotten history" of the world, the Dagor Dagorath represents the coming End of the World, and is often referred to as simply "The End". As Tolkien originally wrote it, The Silmarillion ends with a prophecy by Mandos about the end of the world. The published Silmarillion ends instead with the last paragraph of Valaquenta. This was because Tolkien had abandoned the idea of the "second prophecy of Mandos", and the Valaquenta text, much later, contradicted it openly. However, references to the final battle remain in the published Silmarillion, such as a statement at the end of the Akallabêth that Ar-Pharazôn and his mortal warriors who had set foot on Aman were buried by falling hills, imprisoned in the Caves of the Forgotten until the "Last Battle and Day of Doom". Christopher Tolkien sees the account as similar to the Nordic legend of Ragnarök and J. R. R. Tolkien also made this connection in some of his letters.
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  • 14 Oct 2022
Topic Review
FOCAL-69
FOCAL-69 was the landmark version of the FOCAL programming language, more widely publicized than the original version of the language created in 1968. FOCAL-69, created by Richard Merrill is important because: It was the basis for all later derivatives of the language (some of which branched off from one another); It was the language the classic BASIC game Hamurabi was first written in; It became a popular language on Russian microcomputers.
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  • 14 Oct 2022
Topic Review
Geographical Indication
A geographical indication (GI) is a name or sign used on products which corresponds to a specific geographical location or origin (e.g., a town, region, or country). The use of a geographical indication, as an indication of the product's source, acts as a certification that the product possesses certain qualities, is made according to traditional methods, or enjoys a good reputation due to its geographical origin. Appellation d'origine contrôlée ('Appellation of origin') is a sub-type of geographical indication where quality, method, and reputation of a product originate from a strictly defined area specified in its intellectual property right registration.
  • 1.2K
  • 14 Oct 2022
Topic Review
Historicism (Christianity)
In Christian eschatology, historicism is a method of interpretation of biblical prophecies which associates symbols with historical persons, nations or events. The main primary texts of interest to Christian historicists include apocalyptic literature, such as the Book of Daniel and the Book of Revelation. It sees the prophecies of Daniel as being fulfilled throughout history, extending from the past through the present to the future. It is sometimes called the continuous historical view. Commentators have also applied historicist methods to ancient Jewish history, to the Roman Empire, to Islam, to the Papacy, to the Modern era, and to the end time. The historicist method starts with Daniel 2 and works progressively through consecutive prophecies of the book–chapters 7, 8 and 11–resulting in a view of Daniel's prophecies very different from preterism and futurism. Almost all Protestant Reformers from the Reformation into the 19th century held historicist views.
  • 4.6K
  • 18 Oct 2022
Topic Review
Technology Strategy
Technology strategy (information technology strategy or IT strategy) is the overall plan which consists of objectives, principles and tactics relating to use of technologies within a particular organization. Such strategies primarily focus on the technologies themselves and in some cases the people who directly manage those technologies. The strategy can be implied from the organization's behaviors towards technology decisions, and may be written down in a document. The strategy includes the formal vision that guide the acquisition, allocation, and management of IT resources so it can help fulfill the organizational objectives. Other generations of technology-related strategies primarily focus on: the efficiency of the company's spending on technology; how people, for example the organization's customers and employees, exploit technologies in ways that create value for the organization; on the full integration of technology-related decisions with the company's strategies and operating plans, such that no separate technology strategy exists other than the de facto strategic principle that the organization does not need or have a discrete 'technology strategy'. A technology strategy has traditionally been expressed in a document that explains how technology should be utilized as part of an organization's overall corporate strategy and each business strategy. In the case of IT, the strategy is usually formulated by a group of representatives from both the business and from IT. Often the Information Technology Strategy is led by an organization's Chief Technology Officer (CTO) or equivalent. Accountability varies for an organization's strategies for other classes of technology. Although many companies write an overall business plan each year, a technology strategy may cover developments somewhere between 3 and 5 years into the future. The United States identified the need to implement a technology strategy in order to restore the country's competitive edge. In 1983 Project Socrates, a US Defense Intelligence Agency program, was established to develop a national technology strategy policy.
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  • 14 Oct 2022
Topic Review
Society of the Friends of Truth
The Society of the Friends of Truth (Amis de la Verité), also known as the Social Club (French: Cercle social), was a French revolutionary organization founded in 1790. It was "a mixture of revolutionary political club, the Masonic Lodge, and a literary salon". It also published an influential revolutionary newspaper, the Mouth of Iron.
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  • 14 Oct 2022
Topic Review
Heurist
Heurist is an online database designed for digital research objects including bibliographic records, web bookmarks, historical events, document annotations, images, contemporary stories and other data which is rich in text and classification data, and often heterogeneous. Heurist was originally designed by Ian Johnson (from 2005) and developed by the (now disbanded) Arts eResearch unit (AeR) at the University of Sydney. It continues to be developed within the Faculty of Arts. It was released as Open Source software in May 2013 (version 3.1.0), originally on Google Code, later moved to GitHub, and a free web service for low-demand academic databases is available at http://heurist.sydney.edu.au - other free services are listed in the project web site (http://HeuristNetwork.org). Heurist was developed to overcome two problems identified as common to researchers in the Humanities (and others): It aims to tackle the first issue by providing a web service supporting the on-demand creation and configuration of new databases through a web interface. It aims to tackle the second issue by allowing the storage and interlinking of a wide variety of research data, notes, annotations and digital attachments in a single shared database, while providing individual ‘views’ on this data and workgroup-owned and private areas for research in progress.
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  • 14 Oct 2022
Topic Review
Spectral Estimation of Multidimensional Signals
Power spectral estimation forms the basis for distinguishing and tracking signals in the presence of noise and extracting information from available data. One dimensional signals are expressed in terms of a single domain while multidimensional signals are represented in wave vector and frequency spectrum. Therefore, spectral estimation in the case of multidimensional signals gets a bit tricky.
  • 922
  • 14 Oct 2022
Topic Review
Ante-Nicene Period
The Ante-Nicene Period (literally meaning "before Nicaea") of the history of early Christianity was the period following the Apostolic Age of the 1st century down to the First Council of Nicaea in 325. This period of Christian history had a significant impact on the unity of doctrine across all Christendom and the spreading of Christianity to a greater area of the world. Those seen as prominent figures of this era, referred to as the Ante-Nicene Fathers or Proto-orthodox Christians, generally agreed on most doctrine while the teachings of those early Christian writers which the general majority considered to be heretical, were rejected.
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  • 14 Oct 2022
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