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100-623: The Denys Wilkinson Building is a prominent 1960s building in Oxford , England, designed by Philip Dowson at Arup in 1967. The building houses the astrophysics and particle physics sub-departments of the Department of Physics at Oxford University , plus the undergraduate teaching laboratories. It was originally built for the then Department of Nuclear Physics and named the Nuclear Physics Laboratory . From 1988,

200-483: A combined capacity of 1,695 seats. Hybrid buses began to be used in Oxford in 2010, and their usage has been expanded. In 2014 Oxford Bus introduced a fleet of 20 new buses with flywheel energy storage on the services it operates under contract for Oxford Brookes University . Most buses in the city now use a smartcard to pay for journeys and have free WiFi installed. The Oxford to London coach route offers

300-485: A concrete structural member reinforced with steel will experience minimal differential stress as the temperature changes. Other readily available types of rebar are manufactured of stainless steel , and composite bars made of glass fiber , carbon fiber , or basalt fiber . The carbon steel reinforcing bars may also be coated in zinc or an epoxy resin designed to resist the effects of corrosion, especially when used in saltwater environments. Bamboo has been shown to be

400-543: A device to reinforce arches, vaults , and cupolas . 2,500 meters of rebar was used in the 14th-century Château de Vincennes . During the 18th century, rebar was used to form the carcass of the Leaning Tower of Nevyansk in Russia, built on the orders of the industrialist Akinfiy Demidov . The cast iron used for the rebar was of high quality, and there is no corrosion on the bars to this day. The carcass of

500-693: A frequent coach service to London. The Oxford Tube is operated by Stagecoach West and the Oxford Bus Company runs the Airline services to Heathrow and Gatwick airports. There is a bus station at Gloucester Green , used mainly by the London and airport buses, National Express coaches and other long-distance buses including route X5 to Milton Keynes and Bedford and Stagecoach Gold route S6. Among cities in England and Wales, Oxford has

600-499: A limited ability to carry tensile loads. When rebar is added they are known as "reinforced masonry". A similar approach (of embedding rebar vertically in designed voids in engineered blocks) is also used in dry-laid landscape walls, at least pinning the lowest course in place into the earth, also employed securing the lowest course and/or deadmen in walls made of engineered concrete or wooden landscape ties. In unusual cases, steel reinforcement may be embedded and partially exposed, as in

700-494: A linear accelerator. This particular accelerator consisted of a pressure vessel, about 40 feet tall, containing an annular lift/elevator platform to enable work to be carried out at different levels inside. Stacked in the centre was the accelerator column, comprising the Van de Graaff generator (a thick, rubber/canvas belt approximately 2 feet wide), the up/down vacuum tubes, and the electron stripper and magnet systems on top. The magnet

800-546: A mistake. In November 2022, Mogford announced that his hospitality group The Oxford Collection had joined up with Oxford Business Action Group (OBAG), Oxford High Street Association (OHSA), ROX (Backing Oxford Business), Reconnecting Oxford, Jericho Traders, and Summertown traders to launch a legal challenge to the new bus gates. The city is served by the M40 motorway , which connects London to Birmingham . The M40 approached Oxford in 1974, leading from London to Waterstock , where

900-494: A new company, Morrells of Oxford. The new owners sold most of the pubs on to Greene King in 2002. The Lion Brewery was converted into luxury apartments in 2002. Oxford's first legal distillery , the Oxford Artisan Distillery , was established in 2017 in historic farm buildings at the top of South Park . The Taylor family of Loughborough had a bell-foundry in Oxford between 1786 and 1854. This

1000-488: A new research annexe; its staff have been involved with the teaching of anthropology at Oxford since its foundation, when as part of his donation General Augustus Pitt Rivers stipulated that the university establish a lectureship in anthropology. Rebar The most common type of rebar is carbon steel , typically consisting of hot-rolled round bars with deformation patterns embossed into its surface. Steel and concrete have similar coefficients of thermal expansion , so

1100-412: A pristine Stradivarius violin, regarded by some as one of the finest examples in existence. The University Museum of Natural History holds the university's zoological , entomological and geological specimens. It is housed in a large neo-Gothic building on Parks Road , in the university's Science Area . Among its collection are the skeletons of a Tyrannosaurus rex and Triceratops , and

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1200-463: A third route, also to Paddington, running via Thame , High Wycombe and Maidenhead , was provided; this was shortened in 1906 by the opening of a direct route between High Wycombe and London Paddington by way of Denham . The distance from Oxford to London was 78 miles (125.5 km) via Bletchley; 63.5 miles (102.2 km) via Didcot and Reading; 63.25 miles (101.8 km) via Thame and Maidenhead; and 55.75 miles (89.7 km) via Denham. Only

1300-553: A viable alternative to reinforcing steel in concrete construction. These alternative types tend to be more expensive or may have lesser mechanical properties and are thus more often used in specialty construction where their physical characteristics fulfill a specific performance requirement that carbon steel does not provide. Reinforcing bars in masonry construction have been used since antiquity , with Rome using iron or wooden rods in arch construction. Iron tie rods and anchor plates were later employed across Medieval Europe, as

1400-500: Is 2014, with an average of 11.8 °C (53 °F) and the coldest is 1879, with a mean temperature of 7.7 °C (46 °F). The sunniest month on record is May 2020, with 331.7 hours and December 1890 is the least sunny, with 5.0 hours. The greatest one-day rainfall occurred on 10 July 1968, with a total of 87.9 mm (3.46 in). The greatest known snow depth was 61.0 cm (24.0 in) in February 1888. The city centre

1500-477: Is a small selection of the many notable buildings in Oxford. Oxford is a very green city, with several parks and nature walks within the ring road , as well as several sites just outside the ring road. In total, 28 nature reserves exist within or just outside the ring road, including: In addition to the larger airports in the region, Oxford is served by nearby Oxford Airport , in Kidlington . The airport

1600-706: Is also home to CAE Oxford Aviation Academy and Airways Aviation airline pilot flight training centres, and several private jet companies. The airport is also home to Airbus Helicopters UK headquarters. Direct trains run from Oxford station to London Paddington where there is an interchange with the Heathrow Express train links serving Heathrow Airport . Passengers can change at Reading for connecting trains to Gatwick Airport . Some CrossCountry trains run direct services to Birmingham International , as well as to Southampton Airport Parkway further afield. Bus services in Oxford and its suburbs are run by

1700-424: Is also used in high-corrosion environments. It is available in many forms, such as spirals for reinforcing columns, common rods, and meshes. Most commercially available rebar is made from unidirectional fibers set in a thermoset polymer resin and is often referred to as FRP. Some special construction such as research and manufacturing facilities with very sensitive electronics may require the use of reinforcement that

1800-424: Is approximated as (bar size/9)² square inches. For example, the area of #8 bar is (8/9)² = 0.79 square inches. Bar sizes larger than #8 follow the 1 ⁄ 8 -inch rule imperfectly and skip sizes #12–13, and #15–17 due to historical convention. In early concrete construction bars of one inch and larger were only available in square sections, and when large format deformed round bars became available around 1957,

1900-525: Is cast into it to carry the tensile loads . Most steel reinforcement is divided into primary and secondary reinforcement: Secondary applications include rebar embedded in masonry walls, which includes both bars placed horizontally in a mortar joint (every fourth or fifth course of block) or vertically (in the horizontal voids of cement blocks and cored bricks, which is then fixed in place with grout . Masonry structures held together with grout have similar properties to concrete – high compressive resistance but

2000-466: Is just outside the city, at the park and ride site near Kidlington . The present railway station opened in 1852. Oxford is the junction for a short branch line to Bicester , a remnant of the former Varsity line to Cambridge . This Oxford–Bicester line was upgraded to 100 mph (161 km/h) running during an 18-month closure in 2014/2015 – and is scheduled to be extended to form the planned East West Rail line to Milton Keynes. East West Rail

2100-522: Is non-conductive to electricity, and medical imaging equipment rooms may require non-magnetic properties to avoid interference. FRP rebar, notably glass fibre types have low electrical conductivity and are non-magnetic which is commonly used for such needs. Stainless steel rebar with low magnetic permeability is available and is sometimes used to avoid magnetic interference issues. Reinforcing steel can also be displaced by impacts such as earthquakes , resulting in structural failure. The prime example of this

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2200-553: Is now strongly discouraged, and largely prevented, from using the city centre. The Oxford Ring Road or A4142 (southern part) surrounds the city centre and close suburbs Marston , Iffley , Cowley and Headington ; it consists of the A34 to the west, a 330-yard section of the A44 , the A40 north and north-east, A4142/ A423 to the east. It is a dual carriageway , except for a 330-yard section of

2300-508: Is proposed to continue through Bletchley (for Milton Keynes Central ) to Bedford , Cambridge, and ultimately Ipswich and Norwich , thus providing alternative route to East Anglia without needing to travel via, and connect between, the London mainline terminals. Chiltern Railways operates from Oxford to London Marylebone via Bicester Village , having sponsored the building of about 400 metres of new track between Bicester Village and

2400-519: Is relatively small and is centred on Carfax , a crossroads which forms the junction of Cornmarket Street (pedestrianised), Queen Street (mainly pedestrianised ), St Aldate's and the High Street ("the High"; blocked for through traffic). Cornmarket Street and Queen Street are home to Oxford's chain stores, as well as a small number of independent retailers, one of the longest established of which

2500-765: Is subject to the requirements of Australian Standards AS3600 (Concrete Structures) and AS/NZS4671 (Steel Reinforcing for Concrete). There are other standards that apply to testing, welding and galvanizing. The designation of reinforcement is defined in AS/NZS4671 using the following formats: Shape/ Section D- deformed ribbed bar, R- round / plain bar, I- deformed indented bar Ductility Class L- low ductility, N- normal ductility, E- seismic (Earthquake) ductility Standard grades (MPa) 250N, 300E, 500L, 500N, 500E Bars are typically abbreviated to simply 'N' (hot-rolled deformed bar), 'R' (hot-rolled round bar), 'RW' (cold-drawn ribbed wire) or 'W' (cold-drawn round wire), as

2600-718: Is the collapse of the Cypress Street Viaduct in Oakland, California as a result of the 1989 Loma Prieta earthquake , causing 42 fatalities. The shaking of the earthquake caused rebars to burst from the concrete and buckle . Updated building designs, including more circumferential rebar, can address this type of failure. US/Imperial bar sizes give the diameter in units of 1 ⁄ 8 inch (3.2 mm) for bar sizes #2 through #8, so that #8 = 8 ⁄ 8 inch = 1-inch (25 mm) diameter. There are no fractional bar sizes in this system. The "#" symbol indicates

2700-455: Is the county town. Founded in the 8th century, it was granted city status in 1542. The city is located at the confluence of the rivers Thames (locally known as the Isis ) and Cherwell . It had a population of 163,257 in 2022. It is 56 miles (90 km) north-west of London , 64 miles (103 km) south-east of Birmingham and 61 miles (98 km) north-east of Bristol . The city is home to

2800-1093: The Castle Mill Stream . The rapid expansion of Oxford and the development of its railway links after the 1840s facilitated expansion of the brewing trade. As well as expanding the market for Oxford's brewers, railways enabled brewers further from the city to compete for a share of its market. By 1874 there were nine breweries in Oxford and 13 brewers' agents in Oxford shipping beer in from elsewhere. The nine breweries were: Flowers & Co in Cowley Road , Hall's St Giles Brewery, Hall's Swan Brewery (see below), Hanley's City Brewery in Queen Street , Le Mills's Brewery in St. Ebbes , Morrell's Lion Brewery in St Thomas Street (see below), Simonds's Brewery in Queen Street, Weaving's Eagle Brewery (by 1869

2900-557: The Chiltern Main Line southwards in 2014. The route serves High Wycombe and London Marylebone, avoiding London Paddington and Didcot Parkway . In 1844, the Great Western Railway linked Oxford with London Paddington via Didcot and Reading ; in 1851, the London & North Western Railway opened its own route from Oxford to London Euston , via Bicester , Bletchley and Watford ; and in 1864

3000-493: The Oxford Bus Company and Stagecoach West as well as other operators including Arriva Shires & Essex and Thames Travel . Oxford has one of the largest urban park and ride networks in the United Kingdom. Its five sites, at Pear Tree, Redbridge , Seacourt , Thornhill, Water Eaton and Oxford Parkway have a combined capacity of 4,930 car parking spaces, served by 20 Oxford Bus Company double decker buses with

3100-461: The Oxford Star (tabloid; free and delivered), and Oxford Journal (tabloid; weekly free pick-up). Oxford is also home to several advertising agencies . Daily Information (known locally as "Daily Info") is an event information and advertising news sheet which has been published since 1964 and now provides a connected website. Nightshift is a monthly local free magazine that has covered

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3200-623: The University of Oxford , the oldest university in the English-speaking world ; it has buildings in every style of English architecture since late Anglo-Saxon . Oxford's industries include motor manufacturing, education, publishing, science, and information technologies. The history of Oxford in England dates back to its original settlement in the Saxon period . Originally of strategic significance due to its controlling location on

3300-529: The Westgate Oxford . The Westgate Centre is named for the original West Gate in the city wall, and is at the west end of Queen Street . A major redevelopment and expansion to 750,000 sq ft (70,000 m ), with a new 230,000 sq ft (21,000 m ) John Lewis department store and a number of new homes, was completed in October 2017. Blackwell's Bookshop is a bookshop which claims

3400-404: The number sign , and thus "#6" is read as "number six". The use of the "#" sign is customary for US sizes, but "No." is sometimes used instead. Within the trades rebar is known by a shorthand utilizing the bar diameter as descriptor, such as "four-bar" for bar that is four-eighths (or one-half) of an inch. The cross-sectional area of a bar, as given by πr ², works out to (bar size/9.027)², which

3500-815: The 1970s and 1980s, leaving behind a city which had developed far beyond the university town of the past. Oxford's latitude and longitude are 51°45′07″N 1°15′28″W  /  51.75194°N 1.25778°W  / 51.75194; -1.25778 , with Ordnance Survey grid reference SP513061 (at Carfax Tower , which is usually considered the centre). Oxford is 24 miles (39 km) north-west of Reading , 26 miles (42 km) north-east of Swindon , 36 miles (58 km) east of Cheltenham , 43 miles (69 km) east of Gloucester , 29 miles (47 km) south-west of Milton Keynes , 38 miles (61 km) south-east of Evesham , 43 miles (69 km) south of Rugby and 51 miles (82 km) west-north-west of London . The rivers Cherwell and Thames (also sometimes known as

3600-597: The A40 continued to Oxford. When the M40 extension to Birmingham was completed in January 1991, it curved sharply north, and a mile of the old motorway became a spur. The M40 comes no closer than 6 miles (10 km) away from the city centre, curving to pass to the east of Otmoor . The M40 meets the A34 to the north of Oxford. There are two universities in Oxford, the University of Oxford and Oxford Brookes University , as well as

3700-421: The A40 where two residential service roads adjoin, and was completed in 1966. The main roads to/from Oxford are: On 28 February 2022 a zero-emission pilot area became operational in Oxford city centre. Zero-emission vehicles can be used without incurring a charge but all petrol and diesel vehicles (including hybrids) incur a daily charge if they are driven in the zone between 7am and 7pm. A consultation on

3800-724: The Eagle Steam Brewery) in Park End Street and Wootten and Cole's St. Clement's Brewery. The Swan's Nest Brewery, later the Swan Brewery, was established by the early 18th century in Paradise Street , and in 1795 was acquired by William Hall. The brewery became known as Hall's Oxford Brewery, which acquired other local breweries. Hall's Brewery was acquired by Samuel Allsopp & Sons in 1926, after which it ceased brewing in Oxford. Morrell's

3900-555: The Isis locally, supposedly from the Latinised name Thamesis ) run through Oxford and meet south of the city centre. These rivers and their flood plains constrain the size of the city centre. Oxford has a maritime temperate climate ( Köppen : Cfb ). Precipitation is uniformly distributed throughout the year and is provided mostly by weather systems that arrive from the Atlantic . The lowest temperature ever recorded in Oxford

4000-475: The Italian/French border. This was an RF resonant cavity accelerator and would add additional energy to the nuclei. It was located down in a basement. On exiting the accelerator the nuclei would drift to a target station for experiments. The particle energy at the target station was about 22MeV. In the late 1980s, this accelerator was sold to Beijing University. To extract it holes had to be cut through

4100-514: The Oxford music scene since 1991. Oxford is home to many museums , galleries , and collections, most of which are free of admission charges and are major tourist attractions . The majority are departments of the University of Oxford . The first of these to be established was the Ashmolean Museum , the world's first university museum , and the oldest museum in the UK. Its first building

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4200-809: The United Kingdom, after the British Library . The Bodleian Library is a legal deposit library, which means that it is entitled to request a free copy of every book published in the United Kingdom. As such, its collection is growing at a rate of over three miles (five kilometres) of shelving every year. As well as the BBC national radio stations , Oxford and the surrounding area has several local stations, including BBC Radio Oxford , Heart South , Destiny 105 , Greatest Hits Radio and Hits Radio Oxfordshire , along with Oxide: Oxford Student Radio (which went on terrestrial radio at 87.7 MHz FM in late May 2005). A local TV station , Six TV : The Oxford Channel,

4300-657: The United States, made a significant contribution to the development of reinforcing bars in concrete construction. He invented twisted iron rebar, which he initially thought of while designing self-supporting sidewalks for the Masonic Hall in Stockton, California. His twisted rebar was, however, not initially appreciated and even ridiculed at the Technical Society of California, where members stated that

4400-413: The United States, who produced and tested reinforced concrete beams. Joseph Monier of France is one of the most notable figures for the invention and popularization of reinforced concrete. As a French gardener, Monier patented reinforced concrete flowerpots in 1867, before proceeding to build reinforced concrete water tanks and bridges. Ernest L. Ransome , an English engineer and architect who worked in

4500-440: The Van de Graaff generator by electrostatic attraction. At the top, the ions would pass through a thin foil to strip off electrons, and then their trajectory would be bent 180° by a large magnetic field. The now positively charged nuclei would then be electrostatically repelled by the same charge, accelerating them back down another vacuum tube. At the bottom the beam pipe exited, the beam was bent 90° by another magnet before entering

4600-498: The Van de Graaff generator to be run resulting in greater particle energies being attained than if air had been used. It also served as a fire suppressant, in the event of a spark discharge (which, when they did occur, was described as being "very loud indeed"). The sulphur hexafluoride was sourced from a company in Italy, and occasionally shipments of " bomb ola di gas" addressed to the "Nuclear Physics Department" Oxford would get stuck on

4700-509: The accelerators in the Denys Wilkinson Building fell into disuse. The building was designed around conducting particle physics. The bulk of the accelerator infrastructure and experimental target station is in basement levels. The walls of the building at the lower levels are very thick concrete and are laden with boron. This was to keep the natural background radiation count inside the building as low as possible, and not (as

4800-587: The area is often used by film and TV crews. Aside from the city centre, there are several suburbs and neighbourhoods within the borders of the city of Oxford, including: Oxford is at the centre of the Oxford Green Belt , which is an environmental and planning policy that regulates the rural space in Oxfordshire surrounding the city, aiming to prevent urban sprawl and minimize convergence with nearby settlements. The policy has been blamed for

4900-486: The bar into place, while the second makes use of the high compressive strength of concrete. Common rebar is made of unfinished tempered steel, making it susceptible to rusting . Normally the concrete cover is able to provide a pH value higher than 12 avoiding the corrosion reaction. Too little concrete cover can compromise this guard through carbonation from the surface, and salt penetration . Too much concrete cover can cause bigger crack widths which also compromises

5000-583: The bars and corrosion under the epoxy film have been reported. These epoxy-coated bars are used in over 70,000 bridge decks in the US, but this technology was slowly being phased out in favor of stainless steel rebar as of 2005 because of its poor performance. Requirements for deformations are found in US-standard product specifications for steel bar reinforcing, such as ASTM A615 and ASTM A706, and dictate lug spacing and height. Fibre-reinforced plastic rebar

5100-700: The beams at the columns. This type of failure manifested in the partial collapse of the Bixby Hotel in Long Beach, California and total collapse of the Eastman Kodak Building in Rochester, New York, both during construction in 1906. It was, however, concluded that both failures were the consequences of poor-quality labor. With the increase in demand of construction standardization, innovative reinforcing systems such as Kahn's were pushed to

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5200-668: The building was known as the Nuclear and Astrophysics Laboratory (NAPL) after the (Sub-)Department of Astrophysics moved from the University Observatory in the Science Area . In 2001, the building was renamed as the Denys Wilkinson Building, in honour of the British nuclear physicist Sir Denys Wilkinson (1922–2016), who was involved in its original creation. The building is located on the corner of Banbury Road to

5300-548: The building. The JAI was established in 2004 as a joint venture between the Departments of Physics at Oxford and Royal Holloway University of London , with Imperial College London joining the venture in 2011. 51°45′35″N 1°15′35″W  /  51.7596°N 1.2596°W  / 51.7596; -1.2596 Oxford Oxford ( / ˈ ɒ k s f ər d / ) is a cathedral city and non-metropolitan district in Oxfordshire , England, of which it

5400-795: The city of Oxford was a county borough , independent from the county council. Oxford City Council meets at the Town Hall on the street called St Aldate's in the city centre. The current building was completed in 1897, on a site which had been occupied by Oxford's guildhall since the 13th century. Most of Oxford is an unparished area , but there are four civil parishes within the city's boundaries: Blackbird Leys , Littlemore , Old Marston , and Risinghurst and Sandhills . Oxford's economy includes manufacturing, publishing and science-based industries as well as education, sports, entertainment, breweries, research and tourism. Oxford has been an important centre of motor manufacturing since Morris Motors

5500-406: The concrete, it can still be pulled out of the concrete under high stresses, an occurrence that often accompanies a larger-scale collapse of the structure. To prevent such a failure, rebar is either deeply embedded into adjacent structural members (40–60 times the diameter), or bent and hooked at the ends to lock it around the concrete and other rebar. This first approach increases the friction locking

5600-417: The floor of the covered loading dock located at the north side of the building all the way down to the lowest basement. The accelerators were intended to support research into nuclear structure, a field that was popular at the time of the building's construction. However, it was discovered that the field was extremely complex and progress was slow. The field was overtaken by other fields in nuclear physics, and

5700-405: The idea that Kahn's reinforcing system in concrete beams would act as a Warren truss and also noted that this system would not provide the adequate amount of shear stress reinforcement at the ends of the simply supported beams, the place where the shear stress is greatest. Furthermore, Turner warned that Kahn's system could result in a brittle failure as it did not have longitudinal reinforcement in

5800-929: The industry manufactured them to provide the cross-sectional area equivalent of standard square bar sizes that were formerly used. The diameter of the equivalent large format round shape is rounded to the nearest 1 ⁄ 8 inch to provide the bar size. For example, #9 bar has a cross section of 1.00 square inch (6.5 cm ), and therefore a diameter of 1.128 inches (28.7 mm). #10, #11, #14, and #18 sizes correspond to 1 1 ⁄ 8 inch, 1 1 ⁄ 4 , 1 1 ⁄ 2 , and 2-inch square bars, respectively. Sizes smaller than #3 are no longer recognized as standard sizes. These are most commonly manufactured as plain round undeformed rod steel but can be made with deformations. Sizes smaller than #3 are typically referred to as "wire" products and not "bar" and specified by either their nominal diameter or wire gage number. #2 bars are often informally called "pencil rod" as they are about

5900-400: The introduction of a wider zero-emission zone is expected in the future, at a date to be confirmed. Oxford has eight bus gates, short sections of road where only buses and other authorised vehicles can pass. Six further bus gates are currently proposed. A council-led consultation on the traffic filters ended on 13 October 2022. On 29 November 2022, Oxfordshire County Council cabinet approved

6000-494: The introduction on a trial basis, for a minimum period of six months. The trial will begin after improvement works to Oxford railway station are complete, which is expected to be by October 2024. The additional bus gates have been controversial; Oxford University and Oxford Bus Company support the proposals but more than 3,700 people have signed an online petition opposing the new traffic filters for Marston Ferry Road and Hollow Way, and hotelier Jeremy Mogford has argued they would be

6100-493: The large rise in house prices in Oxford, making it the least affordable city in the United Kingdom outside of London, with estate agents calling for brownfield land inside the green belt to be released for new housing. The vast majority of the area covered is outside of the city, but there are some green spaces within that which are covered by the designation, such as much of the Thames and river Cherwell flood-meadows , and

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6200-548: The largest single room devoted to book sales in the whole of Europe, the Norrington Room (10,000 sq ft). There is a long history of brewing in Oxford. Several of the colleges had private breweries, one of which, at Brasenose , survived until 1889. In the 16th century brewing and malting appear to have been the most popular trades in the city. There were breweries in Brewer Street and Paradise Street , near

6300-407: The local council, which periodically tried to shut down the "Nuclear Physics Department" of the university. Generally, such tensions were resolved with arranged visits, and explanations as to the role it would also serve for the councillors in the event of a nuclear attack on the United Kingdom. The John Adams Institute for Accelerator Science (JAI), named for John Adams (physicist) , is located in

6400-682: The local guard. As rust takes up greater volume than the steel from which it was formed, it causes severe internal pressure on the surrounding concrete, leading to cracking, spalling , and, ultimately, structural failure . This phenomenon is known as oxide jacking . This is a particular problem where the concrete is exposed to salt water, as in bridges where salt is applied to roadways in winter, or in marine applications. Uncoated, corrosion-resistant low- carbon / chromium (microcomposite), silicon bronze , epoxy -coated, galvanized , or stainless steel rebars may be employed in these situations at greater initial expense, but significantly lower expense over

6500-678: The most complete remains of a dodo found anywhere in the world. It also hosts the Simonyi Professorship of the Public Understanding of Science , currently held by Marcus du Sautoy . Adjoining the Museum of Natural History is the Pitt Rivers Museum , founded in 1884, which displays the university's archaeological and anthropological collections, currently holding over 500,000 items. It recently built

6600-446: The nominal bar diameter in millimeters, as an "alternate size" specification. Substituting a true metric size for a US/Imperial size is called a hard conversion , and sometimes results in the use of a physically different sized bar. bar size size (soft) Metric bar designations represent the nominal bar diameter in millimeters, rounded to the nearest 5 mm. bar size (kg/m) (mm) Area (mm ) Metric bar designations represent

6700-519: The nominal bar diameter in millimetres. Preferred bar sizes in Europe are specified to comply with Table 6 of the standard EN 10080 , although various national standards still remain in force (e.g. BS 4449 in the United Kingdom). In Switzerland some sizes are different from European standard. bar size density (kg/m) diameter (mm) area (mm ) Reinforcement for use in concrete construction

6800-416: The original ( Didcot ) route is still in use for its full length, portions of the others remain. There were also routes to the north and west. The line to Banbury was opened in 1850, and was extended to Birmingham Snow Hill in 1852; a route to Worcester opened in 1853. A branch to Witney was opened in 1862, which was extended to Fairford in 1873. The line to Witney and Fairford closed in 1962, but

6900-755: The others remain open. Oxford was historically an important port on the River Thames , with this section of the river being called the Isis ; the Oxford-Burcot Commission in the 17th century attempted to improve navigation to Oxford. Iffley Lock and Osney Lock lie within the bounds of the city. In the 18th century the Oxford Canal was built to connect Oxford with the Midlands . Commercial traffic has given way to recreational use of

7000-519: The pool of Oxford University students and graduates, and, especially for EFL education , use their Oxford location as a selling point. Oxford has numerous major tourist attractions, many belonging to the university and colleges. As well as several famous institutions, the town centre is home to Carfax Tower and the University Church of St Mary the Virgin, both of which offer views over

7100-516: The qualification of “tentative” was removed when the updated standard ASTM A305-49 was issued in 1949. The requirements for deformations found in current specifications for steel bar reinforcing, such as ASTM A615 and ASTM A706, among others, are the same as those specified in ASTM A305-49. Concrete is a material that is very strong in compression , but relatively weak in tension . To compensate for this imbalance in concrete's behavior, rebar

7200-518: The river and canal. Oxford was the original base of Salters Steamers (founded in 1858), which was a leading racing-boatbuilder that played an important role in popularising pleasure boating on the Upper Thames. The firm runs a regular service from Folly Bridge downstream to Abingdon and beyond. Oxford's central location on several transport routes means that it has long been a crossroads city with many coaching inns , although road traffic

7300-491: The same size as a pencil. When US/Imperial sized rebar are used in projects with metric units, the equivalent metric size is typically specified as the nominal diameter rounded to the nearest millimeter. These are not considered standard metric sizes, and thus is often referred to as a soft conversion or the "soft metric" size. The US/Imperial bar size system recognizes the use of true metric bar sizes (No. 10, 12, 16, 20, 25, 28, 32, 36, 40, 50 and 60 specifically) which indicates

7400-458: The second highest percentage of people cycling to work. Oxford railway station is half a mile (about 1 km) west of the city centre. The station is served by CrossCountry services to Bournemouth and Manchester Piccadilly ; Great Western Railway (who manage the station) services to London Paddington , Banbury and Hereford ; and Chiltern Railways services to London Marylebone . Oxford has had three main railway stations. The first

7500-413: The service life of the project. Extra care is taken during the transport, fabrication, handling, installation, and concrete placement process when working with epoxy-coated rebar, because damage will reduce the long-term corrosion resistance of these bars. Even damaged epoxy-coated bars have shown better performance than uncoated reinforcing bars, though issues from debonding of the epoxy coating from

7600-525: The side in favor of the concrete reinforcing systems seen today. Requirements for deformations on steel bar reinforcement were not standardized in US construction until about 1950. Modern requirements for deformations were established in "Tentative Specifications for the Deformations of Deformed Steel Bars for Concrete Reinforcement", ASTM A305-47T. Subsequently, changes were made that increased rib height and reduced rib spacing for certain bar sizes, and

7700-623: The specialist further and higher education institution Ruskin College that is part of the University of West London in Oxford. The Islamic Azad University also has a campus near Oxford. The University of Oxford is the oldest university in the English-speaking world, and one of the most prestigious higher education institutions of the world, averaging nine applications to every available place, and attracting 40% of its academic staff and 17% of undergraduates from overseas. In September 2016, it

7800-532: The spires of the city. Many tourists shop at the historic Covered Market . In the summer, punting on the Thames / Isis and the Cherwell is a common practice. As well as being a major draw for tourists (9.1 million in 2008, similar in 2009) , Oxford city centre has many shops, several theatres and an ice rink. There are two small shopping malls in the city centre: the Clarendon Centre and

7900-542: The steel tie bars that constrain and reinforce the masonry of Nevyansk Tower or ancient structures in Rome and the Vatican. Steel has a thermal expansion coefficient nearly equal to that of modern concrete . If this were not so, it would cause problems through additional longitudinal and perpendicular stresses at temperatures different from the temperature of the setting. Although rebar has ribs that bind it mechanically to

8000-552: The tower was connected to its cast iron tented roof , crowned with one of the first known lightning rods . However, not until the mid-19th century, with the embedding of steel bars into concrete (thus producing modern reinforced concrete ), did rebar display its greatest strengths. Several people in Europe and North America developed reinforced concrete in the 1850s. These include Joseph-Louis Lambot of France, who built reinforced concrete boats in Paris (1854) and Thaddeus Hyatt of

8100-660: The town. A heavily ecclesiastical town, Oxford was greatly affected by the changes of the English Reformation , emerging as the seat of a bishopric and a full-fledged city. During the English Civil War , Oxford housed the court of Charles I and stood at the heart of national affairs. The city began to grow industrially during the 19th century, and had an industrial boom in the early 20th century, with major printing and car-manufacturing industries. These declined, along with other British heavy industry, in

8200-670: The twisting would weaken the iron. In 1889, Ransome worked on the West Coast mainly designing bridges. One of these, the Alvord Lake Bridge in San Francisco's Golden Gate Park, was the first reinforced concrete bridge built in the United States. He used twisted rebar in this structure. At the same time Ransome was inventing twisted steel rebar, C.A.P. Turner was designing his "mushroom system" of reinforced concrete floor slabs with smooth round rods and Julius Kahn

8300-615: The upper reaches of the River Thames at its confluence with the River Cherwell , the town grew in national importance during the early Norman period , and in the late 12th century became home to the fledgling University of Oxford . The city was besieged during The Anarchy in 1142. During the Middle Ages Oxford had an important Jewish community, of which David of Oxford and his wife Licoricia of Winchester were prominent members. The university rose to dominate

8400-591: The village of Binsey , along with several smaller portions on the fringes. Other landscape features and places of interest covered include Cutteslowe Park and the mini railway attraction, the University Parks , Hogacre Common Eco Park, numerous sports grounds, Aston's Eyot , St Margaret 's Church and well, and Wolvercote Common and community orchard. There are two tiers of local government covering Oxford, at district and county level: Oxford City Council and Oxfordshire County Council . From 1889 to 1974

8500-503: The west and Keble Road to the south. To the north is the tall Thom Building of Oxford University's Department of Engineering Science, also built in the 1960s. It forms part of the Keble Road Triangle . Attached is a large and distinctive fan-shaped superstructure that was built to house a Van de Graaff generator . Nikolaus Pevsner commented that this marked "the arrival of the ' New Brutalism ' in Oxford". The building

8600-426: Was Boswell's , founded in 1738. The store closed in 2020. St Aldate's has few shops but several local government buildings, including the town hall , the city police station and local council offices. The High (the word street is traditionally omitted) is the longest of the four streets and has a number of independent and high-end chain stores, but mostly university and college buildings. The historic buildings mean

8700-412: Was 1788, with 336.7 mm (13.26 in) of rainfall. The wettest year was 2012, with 979.5 mm (38.56 in). The wettest month on record was September 1774, with a total fall of 223.9 mm (8.81 in). The warmest month on record is July 1983, with an average of 21.1 °C (70 °F) and the coldest is January 1963, with an average of −3.0 °C (27 °F). The warmest year on record

8800-607: Was also available but closed in April 2009; a service operated by That's TV , originally called That's Oxford (now That's Oxfordshire), took to the airwaves in 2015. The city is home to a BBC Television newsroom which produces an opt-out from the main South Today programme broadcast from Southampton . Local papers include The Oxford Times (compact; weekly), its sister papers the Oxford Mail ( tabloid ; daily) and

8900-619: Was erected in 1678–1683 to house a cabinet of curiosities given to the University of Oxford in 1677. The museum reopened in 2009 after a major redevelopment. It holds significant collections of art and archaeology, including works by Michelangelo , Leonardo da Vinci , Turner , and Picasso , as well as treasures such as the Scorpion Macehead , the Parian Marble and the Alfred Jewel . It also contains " The Messiah ",

9000-529: Was established in 1990, and the Begbroke Science Park , owned by the university, lies north of the city. Oxford increasingly has a reputation for being a centre of digital innovation, as epitomized by Digital Oxford. Several startups including Passle, Brainomix, Labstep, and more, are based in Oxford. The presence of the university has also led to Oxford becoming a centre for the education industry. Companies often draw their teaching staff from

9100-527: Was established in the city in 1910. The principal production site for Mini cars, owned by BMW since 2000, is in the Oxford suburb of Cowley . The plant, which survived the turbulent years of British Leyland in the 1970s and was threatened with closure in the early 1990s, also produced cars under the Austin and Rover brands following the demise of the Morris brand in 1984, although the last Morris-badged car

9200-560: Was experimenting with an innovative rolled diamond-shaped rebar with flat-plate flanges angled upwards at 45° (patented in 1902). Kahn predicted concrete beams with this reinforcing system would bend like a Warren truss , and also thought of this rebar as shear reinforcement. Kahn's reinforcing system was built in concrete beams, joists, and columns. The system was both praised and criticized by Kahn's engineering contemporaries: Turner voiced strong objections to this system as it could cause catastrophic failure to concrete structures. He rejected

9300-592: Was founded in 1743 by Richard Tawney. He formed a partnership in 1782 with Mark and James Morrell, who eventually became the owners. After an acrimonious family dispute the brewery was closed in 1998. The beer brand names were taken over by the Thomas Hardy Burtonwood brewery, while the 132 tied pubs were bought by Michael Cannon, owner of the American hamburger chain Fuddruckers , through

9400-565: Was opened at Grandpont in 1844, but this was a terminus, inconvenient for routes to the north; it was replaced by the present station on Park End Street in 1852 with the opening of the Birmingham route. Another terminus, at Rewley Road , was opened in 1851 to serve the Bletchley route; this station closed in 1951. There have also been a number of local railway stations, all of which are now closed. A fourth station, Oxford Parkway ,

9500-406: Was originally built to host two small (by today's standards) particle accelerators. The first was a vertical folded tandem electrostatic accelerator (see Tandem accelerators , the top being at floor level in the fan-shaped superstructure, the bottom in the basements. Negatively charged ions were introduced at the bottom and would be accelerated towards the large charge (10 million volts) built up by

9600-454: Was powered by a generator driven the by Van de Graaff belt. The column was surrounded by electrostatic discharge protection rings, in case of sparks. The whole column was resting on glass bricks at the bottom, with no lateral supports whatsoever. The pressure vessel was filled with sulphur hexafluoride gas. The storage tank for this was located outside on the eastern side of the building. The gas served as an insulator, allowing higher voltages on

9700-581: Was produced there in 1982. Oxford University Press , a department of the University of Oxford , is based in the city, although it no longer operates its own paper mill and printing house. The city is also home to the UK operations of Wiley-Blackwell , Elsevier and several smaller publishing houses. The presence of the university has given rise to many science and technology based businesses, including Oxford Instruments , Research Machines and Sophos . The university established Isis Innovation in 1987 to promote technology transfer. The Oxford Science Park

9800-586: Was ranked as the world's number one university, according to the Times Higher Education World University Rankings . Oxford is renowned for its tutorial -based method of teaching. The University of Oxford maintains the largest university library system in the United Kingdom, and, with over 11 million volumes housed on 120 miles (190 km) of shelving, the Bodleian group is the second-largest library in

9900-419: Was the popular and local civic belief) to keep radiation in. Some of the more exposed parts of the building suffered from rebar corrosion. The building was originally going to be further extended on the eastern side, but the funding never became available. In the 1970s and 1980s, the building's basement was also designated as the emergency shelter for Oxford City Council . There was occasionally tension with

10000-617: Was −17.8 °C (0.0 °F) on 24 December 1860. The highest temperature ever recorded in Oxford is 38.1 °C (101 °F) on 19 July 2022. The average conditions below are from the Radcliffe Meteorological Station . It has the longest series of temperature and rainfall records for one site in Britain . These records are continuous from January 1815. Irregular observations of rainfall, cloud cover, and temperature exist since 1767. The driest year on record

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