uncleflo
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AgustaWestland Project Zero - Wikipedia
Saved by uncleflo on December 22nd, 2019.
The AgustaWestland Project Zero is a hybrid tiltrotor/Lift fan aircraft. It has been developed by AgustaWestland as a technology demonstrator, and is used to investigate all-electric propulsion and other advanced technologies. It is the world's first electric tiltrotor aircraft. In December 2010, AgustaWestland's management approved the formation of a team under James Wang with the intention of producing a technology demonstrator incorporating as many new innovations as possible on a single airframe. Speaking in 2013, Wang noted that electric technologies were rapidly advancing, and that the function of Project Zero was to achieve readiness with electric aircraft technologies: "Rather than waiting for the battery to become even better, then working on electric aircraft technology, the team has positioned itself to be ready for the next generation of batteries".
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ISO/IEC 27000 Cyber Security - Wikipedia
Saved by uncleflo on December 17th, 2019.
ISO/IEC 27000 is part of a growing family of ISO/IEC Information Security Management Systems (ISMS) standards, the 'ISO/IEC 27000 series'. ISO/IEC 27000 is an international standard entitled: Information technology — Security techniques — Information security management systems — Overview and vocabulary. The standard was developed by subcommittee 27 (SC27) of the first Joint Technical Committee (JTC1) of the International Organization for Standardization and the International Electrotechnical Commission.[1]
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Charles de La Fosse — Wikipédia
Saved by uncleflo on May 12th, 2019.
Charles de La Fosse, né le 15 juin 1636 à Paris, où il est mort le 13 décembre 1716, est un peintre français. Il est considéré par les historiens de l'art comme l'un des peintres français les plus importants vers 1700, avec Antoine Coypel et Jean Jouvenet, assurant la transition entre les XVIIe et XVIIIe siècles.
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Product requirements document - Wikipedia
Saved by uncleflo on January 18th, 2019.
A product requirements document (PRD) is a document containing all the requirements to a certain product.
It is written to allow people to understand what a product should do. A PRD should, however, generally avoid anticipating or defining how the product will do it in order to later allow interface designers and engineers to use their expertise to provide the optimal solution to the requirements. PRDs are most frequently written for software products, but can be used for any type of product and also for services. Typically, a PRD is created from a user's point-of-view by a user/client or a company's marketing department (in the latter case it may also be called Marketing Requirements Document (MRD)). The requirements are then analysed by a (potential) maker/supplier from a more technical point of view, broken down and detailed in a Functional Specification (sometimes also called Technical Requirements Document).
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tf–idf - Wikipedia
Saved by uncleflo on December 23rd, 2018.
In information retrieval, tf–idf or TFIDF, short for term frequency–inverse document frequency, is a numerical statistic that is intended to reflect how important a word is to a document in a collection or corpus. It is often used as a weighting factor in searches of information retrieval, text mining, and user modeling. The tf–idf value increases proportionally to the number of times a word appears in the document and is offset by the number of documents in the corpus that contain the word, which helps to adjust for the fact that some words appear more frequently in general. Tf–idf is one of the most popular term-weighting schemes today; 83% of text-based recommender systems in digital libraries use tf–idf. Variations of the tf–idf weighting scheme are often used by search engines as a central tool in scoring and ranking a document's relevance given a user query. tf–idf can be successfully used for stop-words filtering in various subject fields, including text summarization and classification. One of the simplest ranking functions is computed by summing the tf–idf for each query term; many more sophisticated ranking functions are variants of this simple model.
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Wikipedia - Regent's Canal
Saved by uncleflo on December 20th, 2018.
Regent's Canal is a canal across an area just north of central London, England. It provides a link from the Paddington Arm of the Grand Union Canal, 500 m north-west of Paddington Basin in the west, to the Limehouse Basin and the River Thames in east London. The canal is 13.8 kilometres (8.6 miles) long. First proposed by Thomas Homer in 1802 as a link from the Paddington arm of the then Grand Junction Canal (opened in 1801) with the River Thames at Limehouse, the Regent's Canal was built during the early 19th century after an Act of Parliament was passed in 1812. Noted architect and town planner John Nash was a director of the company; in 1811 he had produced a masterplan for the Prince Regent to redevelop a large area of central north London – as a result, the Regent’s Canal was included in the scheme, running for part of its distance along the northern edge of Regent's Park.
The entrance to the Regent's Canal at Limehouse, 1823.
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Comma-separated values
Saved by uncleflo on December 28th, 2017.
In computing, a comma-separated values (CSV) file stores tabular data (numbers and text) in plain text. Each line of the file is a data record. Each record consists of one or more fields, separated by commas. The use of the comma as a field separator is the source of the name for this file format. The CSV file format is not standardized. The basic idea of separating fields with a comma is clear, but that idea gets complicated when the field data may also contain commas or even embedded line-breaks. CSV implementations may not handle such field data, or they may use quotation marks to surround the field. Quotation does not solve everything: some fields may need embedded quotation marks, so a CSV implementation may include escape characters or escape sequences. In addition, the term "CSV" also denotes some closely related delimiter-separated formats that use different field delimiters. These include tab-separated values and space-separated values. A delimiter that is not present in the field data (such as tab) keeps the format parsing simple. These alternate delimiter-separated files are often even given a .csv extension despite the use of a non-comma field separator. This loose terminology can cause problems in data exchange. Many applications that accept CSV files have options to select the delimiter character and the quotation character.
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OSGi
Saved by uncleflo on December 27th, 2017.
The OSGi Alliance, formerly known as the Open Services Gateway initiative, is an open standards organization founded in March 1999 that originally specified and continues to maintain the OSGi standard. The OSGi specification describes a modular system and a service platform for the Java programming language that implements a complete and dynamic component model, something that does not exist in standalone Java/VM environments. Applications or components, coming in the form of bundles for deployment, can be remotely installed, started, stopped, updated, and uninstalled without requiring a reboot; management of Java packages/classes is specified in great detail. Application life cycle management is implemented via APIs that allow for remote downloading of management policies. The service registry allows bundles to detect the addition of new services, or the removal of services, and adapt accordingly.
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State-space representation
Saved by uncleflo on June 23rd, 2017.
In control engineering, a state-space representation is a mathematical model of a physical system as a set of input, output and state variables related by first-order differential equations. "State space" refers to the Euclidean space in which the variables on the axes are the state variables. The state of the system can be represented as a vector within that space. To abstract from the number of inputs, outputs and states, these variables are expressed as vectors. Additionally, if the dynamical system is linear, time-invariant, and finite-dimensional, then the differential and algebraic equations may be written in matrix form. The state-space method is characterized by significant algebraization of general system theory, which makes it possible to use Kronecker vector-matrix structures. The capacity of these structures can be efficiently applied to research systems with modulation or without it. The state-space representation (also known as the "time-domain approach") provides a convenient and compact way to model and analyze systems with multiple inputs and outputs. With {\displaystyle p} p inputs and {\displaystyle q} q outputs, we would otherwise have to write down {\displaystyle q\times p} q\times p Laplace transforms to encode all the information about a system. Unlike the frequency domain approach, the use of the state-space representation is not limited to systems with linear components and zero initial conditions.
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SOLID (object-oriented design)
Saved by uncleflo on June 23rd, 2017.
In computer programming, SOLID (single responsibility, open-closed, Liskov substitution, interface segregation and dependency inversion) is a mnemonic acronym introduced by Michael Feathers for the "first five principles" named by Robert C. Martin in the early 2000s that stands for five basic principles of object-oriented programming and design. The intention is that these principles, when applied together, will make it more likely that a programmer will create a system that is easy to maintain and extend over time. The principles of SOLID are guidelines that can be applied while working on software to remove code smells by providing a framework through which the programmer may refactor the software's source code until it is both legible and extensible. It is part of an overall strategy of agile and Adaptive Software Development.
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Two-phase commit protocol
Saved by uncleflo on January 27th, 2017.
In transaction processing, databases, and computer networking, the two-phase commit protocol (2PC) is a type of atomic commitment protocol (ACP). It is a distributed algorithm that coordinates all the processes that participate in a distributed atomic transaction on whether to commit or abort (roll back) the transaction (it is a specialized type of consensus protocol). The protocol achieves its goal even in many cases of temporary system failure (involving either process, network node, communication, etc. failures), and is thus widely used.[1][2][3] However, it is not resilient to all possible failure configurations, and in rare cases, user (e.g., a system's administrator) intervention is needed to remedy an outcome. To accommodate recovery from failure (automatic in most cases) the protocol's participants use logging of the protocol's states. Log records, which are typically slow to generate but survive failures, are used by the protocol's recovery procedures. Many protocol variants exist that primarily differ in logging strategies and recovery mechanisms. Though usually intended to be used infrequently, recovery procedures compose a substantial portion of the protocol, due to many possible failure scenarios to be considered and supported by the protocol.
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Web Services Discovery
Saved by uncleflo on October 21st, 2016.
Web services provide access to software systems over the Internet using standard protocols. In the most basic scenario there is a Web Service Provider that publishes a service and a Web Service Consumer that uses this service. Web Service Discovery is the process of finding a suitable Web Service for a given task. Publishing a Web service involves creating a software artifact and making it accessible to potential consumers. Web Service Providers augment a Web service endpoint with an interface description using the Web Services Description Language (WSDL) so that a consumer can use the service.
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Password strength
Saved by uncleflo on October 17th, 2016.
Password strength is a measure of the effectiveness of a password in resisting guessing and brute-force attacks. In its usual form, it estimates how many trials an attacker who does not have direct access to the password would need, on average, to guess it correctly. The strength of a password is a function of length, complexity, and unpredictability.[1] Using strong passwords lowers overall risk of a security breach, but strong passwords do not replace the need for other effective security controls. The effectiveness of a password of a given strength is strongly determined by the design and implementation of the factors (knowledge, ownership, inherence). The first factor is the main focus in this article.
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Three-phase commit protocol
Saved by uncleflo on October 12th, 2016.
In computer networking and databases, the three-phase commit protocol (3PC)[1] is a distributed algorithm which lets all nodes in a distributed system agree to commit a transaction. Unlike the two-phase commit protocol (2PC) however, 3PC is non-blocking. Specifically, 3PC places an upper bound on the amount of time required before a transaction either commits or aborts. This property ensures that if a given transaction is attempting to commit via 3PC and holds some resource locks, it will release the locks after the timeout.
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List of countries by tax rates
Saved by uncleflo on October 11th, 2016.
Comparison of tax rates around the world is difficult and somewhat subjective. Tax laws in most countries are extremely complex, and tax burden falls differently on different groups in each country and sub-national unit.
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Snell's law - Wikipedia, the free encyclopedia
Saved by uncleflo on February 22nd, 2015.
Snell's law (also known as the Snell–Descartes law and the law of refraction) is a formula used to describe the relationship between the angles of incidence and refraction, when referring to light or other waves passing through a boundary between two different isotropic media, such as water, glass, or air. In optics, the law is used in ray tracing to compute the angles of incidence or refraction, and in experimental optics to find the refractive index of a material. The law is also satisfied in metamaterials, which allow light to be bent "backward" at a negative angle of refraction with a negative refractive index.
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Blinn–Phong shading model - Wikipedia, the free encyclopedia
Saved by uncleflo on December 7th, 2014.
The Blinn–Phong reflection model (also called the modified Phong reflection model) is a modification to the Phong reflection model developed by Jim Blinn. Blinn–Phong is the default shading model used in OpenGL and Direct3D's fixed-function pipeline (before Direct3D 10 and OpenGL 3.1), and is carried out on each vertex as it passes down the graphics pipeline; pixel values between vertices are interpolated by Gouraud shading by default, rather than the more computationally-expensive Phong shading.
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Air-augmented rocket - Wikipedia, the free encyclopedia
Saved by uncleflo on September 2nd, 2014.
Air-augmented rockets (also known as rocket-ejector, ramrocket, ducted rocket, integral rocket/ramjets, or ejector ramjets) use the supersonic exhaust of some kind of rocket engine to further compress air collected by ram effect during flight to use as additional working mass, leading to greater effective thrust for any given amount of fuel than either the rocket or a ramjet alone. It represents a hybrid class of rocket/ramjet engines, similar to a ramjet, but able to give useful thrust from zero speed, and is also able in some cases to operate outside the atmosphere, with fuel efficiency not worse than both a comparable ramjet or rocket at every point.
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CATIA - Wikipedia, the free encyclopedia
Saved by uncleflo on July 15th, 2014.
CATIA (Computer Aided Three-dimensional Interactive Application) is a multi-platform CAD/CAM/CAE commercial software suite developed by the French company Dassault Systèmes directed by Bernard Charlès. Written in the C++ programming language, CATIA is the cornerstone of the Dassault Systèmes software suite. CATIA started as an in-house development in 1977 by French aircraft manufacturer Avions Marcel Dassault, at that time customer of the CAD/CAM CAD software to develop Dassault's Mirage fighter jet. It was later adopted in the aerospace, automotive, shipbuilding, and other industries.
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Discogs - Wikipedia, the free encyclopedia
Saved by uncleflo on April 17th, 2014.
Discogs, short for discographies, is a website and database of information about audio recordings, including commercial releases, promotional releases, and bootleg or off-label releases. The Discogs servers, currently hosted under the domain name discogs.com, are owned by Zink Media, Inc., and are located in Portland, Oregon, US. While the site lists releases in all genres and on all formats, it is especially known as one of the largest online databases of electronic music releases, and of releases on vinyl media. Discogs currently contains more releases than there are English-language Wikipedia pages, at 4.7 million releases, by 3.25 million artists, across nearly 600,000 labels, contributed from over 185,000 contributor user accounts – with these figures constantly growing as users continually add previously unlisted releases to the site over time.
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List of X-planes - Wikipedia, the free encyclopedia
Saved by uncleflo on April 2nd, 2014.
The X-planes are a series of experimental United States airplanes and helicopters (and some rockets) used to test and evaluate new technologies and aerodynamic concepts. Most of the X-planes have been operated by the National Advisory Committee for Aeronautics (NACA) or, later, the National Aeronautics and Space Administration (NASA), often in conjunction with the United States Air Force. The majority of X-Plane testing has occurred at Edwards Air Force Base.[
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Lake Peigneur - Wikipedia, the free encyclopedia
Saved by uncleflo on July 12th, 2013.
Lake Peigneur is located in the U.S. State of Louisiana 1.2 miles (1.9 km) north of Delcambre and 9.1 miles (14.6 km) west of New Iberia, near the northernmost tip of Vermilion Bay. The lake was a 10-foot (3 m) deep freshwater lake popular with sportsmen until an unusual man-made disaster on November 20, 1980, changed the structure of the lake and surrounding land.
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Stirling engine - Wikipedia, the free encyclopedia
Saved by uncleflo on July 12th, 2013.
A Stirling engine is a heat engine operating by cyclic compression and expansion of air or other gas, the working fluid, at different temperature levels such that there is a net conversion of heat energy to mechanical work.[1][2] Or more specifically, a closed-cycle regenerative heat engine with a permanently gaseous working fluid, where closed-cycle is defined as a thermodynamic system in which the working fluid is permanently contained within the system, and regenerative describes the use of a specific type of internal heat exchanger and thermal store, known as the regenerator. It is the inclusion of a regenerator that differentiates the Stirling engine from other closed cycle hot air engines.
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Electrostatic loudspeaker - Wikipedia, the free encyclopedia
Saved by uncleflo on February 13th, 2012.
An electrostatic loudspeaker (ESL) is a loudspeaker design in which sound is generated by the force exerted on a membrane suspended in an electrostatic field. The speakers use a thin flat diaphragm usually consisting of a plastic sheet coated with a conductive material such as graphite sandwiched between two electrically conductive grids, with a small air gap between the diaphragm and grids.
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Duplication Detector
Saved by uncleflo on December 15th, 2011.
Duplication Detector, created for Wikipedia:Copyright problems on the English Wikipedia, is a tool used to compare any two web pages to identify text which has been copied from one to the other. Either, neither, or both pages may be current or old revisions of a Wikipedia article. Please supply the URLs of two websites to compare (you can also choose, using the advanced version, to upload either document from your computer). The tool supports text, HTML, and PDF documents. For other types of documents, check Google's cache for an HTML version by doing a Google search for "cache:URL". To make the tool run faster for very large documents, increase minimum number of words to 3. For source documents containing scattered numerals, you may have to check "Remove numbers" to get the best matches.
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