Tier 4 (other)
Tier 4 or Tier four may refer to: *Tier 4 COVID restrictions in England under The Health Protection (Coronavirus, Restrictions) (All Tiers) (England) Regulations 2020, the highest level *Level 4 COVID restrictions, in COVID-19 pandemic in Scotland *Tier-4 COVID restrictions, in COVID-19 pandemic in Wales *Tier IV, a data center standard *Tier 4 in United States vehicle emission standards See also *Multitier architecture *WTA Tier IV tournaments, Women's Tennis Association tennis second-level tournaments *Tier 1 (other) *Tier 2 (other) *Tier 3 (other) *Tirefour Castle Tirefour Castle, (or Tirefour Broch, also spelled Tirfuir and Tirrefour) is an British Iron Age, Iron Age broch located 4 kilometres north of Achnacroish on the island of Lismore, Scotland. Location Tirefour Castle () is situated on a rocky heig ...

The Health Protection (Coronavirus, Restrictions) (All Tiers) (England) Regulations 2020
The Health Protection (Coronavirus, Restrictions) (All Tiers) (England) Regulations 2020 (SI 2020/1374) is an English emergency statutory instrument that replaced the second lockdown regulations from 2 December 2020. As initially made, it brought back the three-tier legal framework first introduced by the first COVID-19 tier regulations in England (in effect 14 October – 5 November 2020), but with changes to the restrictions within each tier. The regulations were sometimes referred as the "second tier regulations" or the "all tiers regulations". Exceptions to the restrictions on gatherings were initially to be permitted during the Christmas period, defined as 23–27 December 2020. But following a continued rise in infections in London and the South East, parts of those areas were moved up to the highest level, tier 3, on 17 December (ahead of the formal review date) and on 19 December (the formal review date). On 20 December, a new tier 4 was added with restrictions similar ...
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COVID-19 Pandemic In Scotland
The COVID-19 pandemic in Scotland is part of the COVID-19 pandemic of coronavirus disease-2019, caused by the virus SARS-CoV-2. The first case of COVID-19 was confirmed in Scotland on 1 March 2020. Community transmission was first reported on 11 March 2020, and the first confirmed death was on 13 March 2020. COVID-19 became a notifiable disease in Scotland on 22 February 2020. The first cases were detected in Scotland in the following weeks. By 16 March and following the outbreak in Italy, and based on forecasting by epidemiologists at Imperial College London—the Scottish Government advised the public to avoid all "non-essential" travel and contact with others, and to remote work if possible. Those with symptoms, and their household, were asked to self-isolate. Pregnant women, the over 70s, and those with certain illnesses were asked to self-isolate for longer. On 20 March 2020, schools were told to close, along with pubs, cafes and cinemas. On 23 March 2020, a 'Stay at Ho ...
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COVID-19 Pandemic In Wales
The COVID-19 pandemic was confirmed to have spread to Wales on 28 February 2020, with a case being reported in the Swansea area; this first known case was a person who had recently returned from Italy. The first known case of community transmission was reported on 11 March in the Caerphilly area. Wide-ranging restrictions began on many aspects of life in the second half of March 2020; restrictions were relaxed in Wales during the summer once the first wave of virus had passed. In the autumn of that year, with cases rising, restrictions began to be tightened again with individual areas being placed under localised lockdowns. A two-week complete "circuit-breaker" lockdown began in late October. Rising cases and a new variant of the virus led to restrictions being increased again in December. The rollout of COVID-19 vaccinations and a fall in cases led to restrictions being relaxed in the spring and summer. Restrictions were briefly tightened and relaxed at around the end of 20 ...
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Data Center
A data center (American English) or data centre (British English)See spelling differences. is a building, a dedicated space within a building, or a group of buildings used to house computer systems and associated components, such as telecommunications and storage systems. Since IT operations are crucial for business continuity, it generally includes redundant or backup components and infrastructure for power supply, data communication connections, environmental controls (e.g., air conditioning, fire suppression), and various security devices. A large data center is an industrial-scale operation using as much electricity as a small town. History Data centers have their roots in the huge computer rooms of the 1940s, typified by ENIAC, one of the earliest examples of a data center.Old large computer rooms that housed machines like the U.S. Army's ENIAC, which were developed pre-1960 (1945), were now referred to as "data centers". Early computer systems, complex to operate and ma ...
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United States Vehicle Emission Standards
United States vehicle emission standards are set through a combination of legislative mandates enacted by Congress through Clean Air Act (CAA) amendments from 1970 onwards, and executive regulations managed nationally by the Environmental Protection Agency (EPA), and more recently along with the National Highway Traffic Safety Administration (NHTSA). These standard cover common motor vehicle air pollution, including carbon monoxide, nitrogen oxides, and particulate emissions, and newer versions have incorporated fuel economy standards. In nearly all cases, these agencies set standards that are expected to be met on a fleet-wide basis from automobile and other vehicle manufacturers, with states delegated to enforce those standards but not allowed to set stricter requirements. California has generally been the exception, having been granted a waiver and given allowance to set stricter standards as it had established its own via the California Air Resources Board prior to the 1970 ...
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Multitier Architecture
In software engineering, multitier architecture (often referred to as ''n''-tier architecture) is a client–server architecture in which presentation, application processing and data management functions are physically separated. The most widespread use of multitier architecture is the three-tier architecture. ''N''-tier application architecture provides a model by which developers can create flexible and reusable applications. By segregating an application into tiers, developers acquire the option of modifying or adding a specific tier, instead of reworking the entire application. A three-tier architecture is typically composed of a ''presentation'' tier, a ''logic'' tier, and a ''data'' tier. While the concepts of layer and tier are often used interchangeably, one fairly common point of view is that there is indeed a difference. This view holds that a ''layer'' is a logical structuring mechanism for the conceptual elements that make up the software solution, while a ''tier'' ...
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WTA Tier IV Tournaments
The WTA Tier IV tournaments were Women's Tennis Association fourth-level tournaments held from 1990 until the end of the 2008 season. The line-up of events varied over the years, with tournaments being promoted, demoted or cancelled. Some of the tournaments became Tier V events between 1990 and 1992, and later from 2001 to 2005, before being integrated back into Tier IV. From 2009 WTA Tour, WTA changed the tournament categories, so that most of the Tier III and Tier IV tournaments from 2008 were in one category, WTA International tournaments The WTA International Tournaments was a category for professional tennis tournaments of the Women's Tennis Association from the 2009 WTA Tour until 2020, which replaced the previous Tier III and Tier IV categories. The winner of a WTA Internatio .... Events References External links {{WTA Tier IV tournaments * Tier 4 Recurring sporting events disestablished in 2008 Recurring sporting events established in 1990 ...
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Tier 1 (other)
Tier 1 or Tier One may refer to: * Tier 1 capital, the core measure of a bank's financial strength * Tier 1 network, category of Internet backbone network * Scaled Composites Tier One, a suborbital human spaceflight program * Tier 1 nations in rugby union * WTA Tier I tournaments, a series of elite women's tennis tournaments * Tier 1 visas under the Points-based immigration system (United Kingdom) * Tier 1 – UK Nuclear Site Management & Licensing, nuclear site management licensees * Tier One (military), some highly secretive special forces units in the U.S. * Tier 1 in the First COVID-19 tier regulations in England, the lowest concern * Tier 1 in the Second COVID-19 tier regulations in England, the lowest concern * Tier I, a data center standard * Tier I, in United States vehicle emission standards *In a supply chain, those suppliers who sell to the manufacturer or main customer directly See also * Multitier architecture * Two-tier healthcare * Three-tier system (disambiguatio ...
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Tier 2 (other)
Tier 2 may refer to: * Tier 2 capital, constituents of a bank's capital requirement * Tier 2 network, a type of Internet service provider * Scaled Composites Tier Two, a human spaceflight program * Tier 2 in the First COVID-19 tier regulations in England, the middle level * Tier 2 in the Second COVID-19 tier regulations in England * Tier II, a data center standard * Tier II, in United States vehicle emission standards See also * Two-tier healthcare * Multitier architecture * WTA Tier II tournaments, Women's Tennis Association tennis second-level tournaments * Three-tier system (other) * Tier 1 (other) * Tier 3 (other) * Tier 4 (other) Tier 4 or Tier four may refer to: *Tier 4 COVID restrictions in England under The Health Protection (Coronavirus, Restrictions) (All Tiers) (England) Regulations 2020, the highest level *Level 4 COVID restrictions, in COVID-19 pandemic in Scotland ... * Tier II+, a remotely-piloted, surveillance aircraft { ...
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Tier 3 (other)
Tier 3 may refer to: * Tier 3 (nightclub), in New York, U.S. * Tier 3 of the First COVID-19 tier regulations in England, the highest level * Tier 3 of the Second COVID-19 tier regulations in England * Tier 3 Railway lines in Australia * Tier III, a data center standard * Tier 3 in United States vehicle emission standards See also * Multitier architecture * WTA Tier III tournaments, Women's Tennis Association tennis third-level tournaments * Three-tier system (other) * Tier III- (Tier 3 minus), an unmanned aerial vehicle * Tier 1 (other) * Tier 2 (other) * Tier 4 (other) Tier 4 or Tier four may refer to: *Tier 4 COVID restrictions in England under The Health Protection (Coronavirus, Restrictions) (All Tiers) (England) Regulations 2020, the highest level *Level 4 COVID restrictions, in COVID-19 pandemic in Scotland ...