35°17′35″S 149°07′15″E / 35.293056°S 149.120833°E / -35.293056; 149.120833
130-468: The National Museum of Australia (NMA), in the national capital Canberra , preserves and interprets Australia 's social history, exploring the key issues, people and events that have shaped the nation. It was formally established by the National Museum of Australia Act 1980 . The museum profiles 50,000 years of Indigenous heritage, settlement since 1788 and key events including Federation and
260-571: A Skywhale family , an event marked by Skywhale-themed pastries and beer produced by local companies as well as an art pop song entitled "We are the Skywhales". In 2014, Canberra was named the best city to live in the world by the Organisation for Economic Co-operation and Development , and was named the third best city to visit in the world by Lonely Planet in 2017. Canberra covers an area of 814.2 km (314.4 sq mi) and
390-597: A dairy on the site in 1832, now regarded as the oldest standing European building in Canberra, followed by the imposing stone house that is now the officers' mess of the Royal Military College, Duntroon . The Campbells sponsored settlement by other farmer families to work their land, such as the Southwells of " Weetangera ". Other notable early colonists included Henry Donnison, who established
520-613: A 3-step process: sulfuric acid anodizing, electrochemical modification of the anodic pore, and metal (tin) deposition. Sealing is the final step in the anodizing process. Acidic anodizing solutions produce pores in the anodized coating. These pores can absorb dyes and retain lubricants but are also an avenue for corrosion. When lubrication properties are not critical, they are usually sealed after dyeing to increase corrosion resistance and dye retention. There are three most common types of sealing. Anodized aluminium surfaces that are not regularly cleaned are susceptible to panel edge staining ,
650-601: A Royal Commission in 1916 ruled his authority had been usurped by certain officials and his original plan was reinstated. Griffin's relationship with the Australian authorities was strained and a lack of funding meant that by the time he was fired in 1920, little work had been done. By this time, Griffin had revised his plan, overseen the earthworks of major avenues and established the Glenloch Cork Plantation. The Commonwealth government purchased
780-441: A coating that is 2 μm thick will increase the part dimensions by 1 μm per surface. If the part is anodized on all sides, then all linear dimensions will increase by the oxide thickness. Anodized aluminium surfaces are harder than aluminium but have low to moderate wear resistance, although this can be improved with thickness and sealing. A desmut solution can be applied to the surface of aluminium to remove contaminates. Nitric acid
910-430: A cross-disciplinary approach to history, ensuring the museum is a lively forum for ideas and debate about Australia's past, present and future. The museum's innovative use of new technologies has been central to its growing international reputation in outreach programming, particularly with regional communities. From 2003 to 2008, the museum hosted Talkback Classroom , a student political forum. The museum did not have
1040-777: A degree self-healing. They are harder to dye and may be applied as a pretreatment before painting. The method of film formation is different from using sulfuric acid in that the voltage is ramped up through the process cycle. Sulfuric acid is the most widely used solution to produce an anodized coating. Coatings of moderate thickness 1.8 μm to 25 μm (0.00007" to 0.001") are known as Type II in North America, as named by MIL-A-8625, while coatings thicker than 25 μm (0.001") are known as Type III, hard-coat, hard anodizing, or engineered anodizing. Very thin coatings similar to those produced by chromic anodizing are known as Type IIB. Thick coatings require more process control, and are produced in
1170-567: A few days earlier. Planned development of the city slowed significantly during the depression of the 1930s and during World War II. Some projects planned for that time, including Roman Catholic and Anglican cathedrals, were never completed. (Nevertheless, in 1973 the Roman Catholic parish church of St. Christopher was remodelled into St. Christopher's Cathedral, Manuka , serving the Archdiocese of Canberra and Goulburn. It
1300-435: A grid. Griffin's proposal had an abundance of geometric patterns, including concentric hexagonal and octagonal streets emanating from several radii. However, the outer areas of the city, built later, are not laid out geometrically. Lake Burley Griffin was deliberately designed so that the orientation of the components was related to various topographical landmarks in Canberra. The lakes stretch from east to west and divided
1430-424: A knot, with trailing ropes or strips extending from the building. The most obvious of these extensions forms a large loop before becoming a walkway which extends past the neighbouring AIATSIS building ending in a large curl, as if a huge ribbon has haphazardly unrolled itself along the ground. Known as the " Uluru Axis" because it aligns with the central Australian natural landmark, the ribbon symbolically integrates
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#17327728773261560-439: A museum, with startling colours and angles, unusual spaces and unpredictable projections and textures. Though hard to precisely categorise, the building can be seen as an example of Charles Jencks ' "new paradigm". Some characteristics of Deconstructivism can also be identified. The organising concept of the scheme using the idea of a "tangled vision" incorporates a variety of references including: The building's architecture
1690-399: A new cafe and administration wing. The new cafe opened in late 2012. It overlooks Lake Burley Griffin and offers both indoor and outdoor dining. The relocation of the museum's cafe freed up the vast entry Hall for the display of large objects from the museum's collection, including vehicles. The new administration wing, which links the main building with the existing administration building,
1820-612: A permanent home until 11 March 2001, when a purpose-built museum building was officially opened. It is located on Acton Peninsula in the suburb of Acton , next to the Australian National University . The peninsula on Lake Burley Griffin was previously the home of the Royal Canberra Hospital, which was demolished in tragic circumstances on 13 July 1997. As designed by architect Howard Raggatt (design architect and design director for
1950-494: A porous surface which can accept dyes easily. The number of dye colours is almost endless; however, the colours produced tend to vary according to the base alloy. The most common colours in the industry, due to them being relatively cheap, are yellow, green, blue, black, orange, purple and red. Though some may prefer lighter colours, in practice they may be difficult to produce on certain alloys such as high-silicon casting grades and 2000-series aluminium-copper alloys . Another concern
2080-770: A refrigerated tank near the freezing point of water with higher voltages than the thinner coatings. Hard anodizing can be made between 13 and 150 μm (0.0005" to 0.006") thick. Anodizing thickness increases wear resistance, corrosion resistance, ability to retain lubricants and PTFE coatings, and electrical and thermal insulation. Sealing Type III will improve corrosion resistance at the cost of reducing abrasion resistance. Sealing will reduce this greatly. Standards for thin (Soft/Standard) sulfuric anodizing are given by MIL-A-8625 Types II and IIB, AMS 2471 (undyed), and AMS 2472 (dyed), BS EN ISO 12373/1 (decorative), BS 3987 (Architectural). Standards for thick sulphuric anodizing are given by MIL-A-8625 Type III, AMS 2469, BS ISO 10074, BS EN 2536 and
2210-436: A significant advantage when it comes to ruggedness or physical wear resistance. The reason for combining the processes can vary, however, the significant difference between anodizing and chromate conversion coating is the electrical conductivity of the films produced. Although both stable compounds, chromate conversion coating has a greatly increased electrical conductivity. Applications where this may be useful are varied, however
2340-407: A thickness in the range of 30 nanometers (1.2 × 10 in) to several micrometers. Standards for titanium anodizing are given by AMS 2487 and AMS 2488. AMS 2488 Type III anodizing of titanium generates an array of different colours without dyes, for which it is sometimes used in art, costume jewellery , body piercing jewellery and wedding rings . The colour formed is dependent on the thickness of
2470-409: A unique type of surface staining that can affect the structural integrity of the metal. Anodizing is one of the more environmentally friendly metal finishing processes. Except for organic (aka integral colour) anodizing, the by-products contain only small amounts of heavy metals , halogens , or volatile organic compounds . Integral color anodizing produces no VOCs, heavy metals, or halogens as all of
2600-405: A village and its disorganised collection of buildings was deemed ugly. Canberra was often derisively described as "several suburbs in search of a city". Prime Minister Sir Robert Menzies regarded the state of the national capital as an embarrassment. Over time his attitude changed from one of contempt to that of championing its development. He fired two ministers charged with the development of
2730-608: A week. This event coincided with a heatwave across south-eastern Australia during which the temperature in Canberra reached 108.5 degrees Fahrenheit (42.5 Celsius) on 11 January. On Friday, 13 January, the Black Friday bushfires caused 71 deaths in Victoria and Wells accompanied the Governor-General on his tour of areas threatened by fires. Immediately after the end of the war, Canberra was criticised for resembling
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#17327728773262860-408: Is 2050°C (2323K), much higher than pure aluminium's 658°C (931K). This and the insulativity of aluminium oxide can make welding more difficult. In typical commercial aluminium anodizing processes, the aluminium oxide is grown down into the surface and out from the surface by equal amounts. Therefore, anodizing will increase the part dimensions on each surface by half the oxide thickness. For example,
2990-421: Is also used to prevent galling of threaded components and to make dielectric films for electrolytic capacitors . Anodic films are most commonly applied to protect aluminium alloys , although processes also exist for titanium , zinc , magnesium , niobium , zirconium , hafnium , and tantalum . Iron or carbon steel metal exfoliates when oxidized under neutral or alkaline micro-electrolytic conditions; i.e.,
3120-605: Is an electrolytic passivation process used to increase the thickness of the natural oxide layer on the surface of metal parts. The process is called anodizing because the part to be treated forms the anode electrode of an electrolytic cell . Anodizing increases resistance to corrosion and wear, and provides better adhesion for paint primers and glues than bare metal does. Anodic films can also be used for several cosmetic effects, either with thick porous coatings that can absorb dyes or with thin transparent coatings that add reflected light wave interference effects. Anodizing
3250-400: Is an entirely planned city . The Griffins' plan featured geometric motifs and was centred on axes aligned with significant topographical landmarks such as Black Mountain , Mount Ainslie , Capital Hill and City Hill . Canberra's mountainous location makes it the only mainland Australian city where snow-capped mountains can be seen in winter, although snow in the city itself is uncommon. As
3380-504: Is anodized primarily as a primer for paint. A thin (5 μm) film is sufficient for this. Thicker coatings of 25 μm and up can provide mild corrosion resistance when sealed with oil, wax, or sodium silicate . Standards for magnesium anodizing are given in AMS 2466, AMS 2478, AMS 2479, and ASTM B893. Niobium anodizes in a similar fashion to titanium with a range of attractive colors being formed by interference at different film thicknesses. Again
3510-485: Is chromic acid anodizing, Type II is sulphuric acid anodizing, and Type III is sulphuric acid hard anodizing. Other anodizing specifications include more MIL-SPECs (e.g., MIL-A-63576), aerospace industry specs by organizations such as SAE , ASTM , and ISO (e.g., AMS 2469, AMS 2470, AMS 2471, AMS 2472, AMS 2482, ASTM B580, ASTM D3933, ISO 10074, and BS 5599), and corporation-specific specs (such as those of Boeing, Lockheed Martin, Airbus and other large contractors). AMS 2468
3640-581: Is common in the winter months. Snow is rare in the CBD (central business district) due to being on the leeward (eastern) side of the dividing range, but the surrounding areas get annual snowfall through winter and often the snow-capped Brindabella Range can be seen from the CBD. The last significant snowfall in the city centre was in 1968. Canberra is often affected by foehn winds, especially in winter and spring , evident by its anomalously warm maxima relative to altitude. The highest recorded maximum temperature
3770-660: Is located near the Brindabella Ranges (part of the Australian Alps ), approximately 150 km (93 mi) inland from Australia's east coast . It has an elevation of approximately 580 m (1,900 ft) AHD ; the highest point is Mount Majura at 888 m (2,913 ft). Other low mountains include Mount Taylor 855 m (2,805 ft), Mount Ainslie 843 m (2,766 ft), Mount Mugga Mugga 812 m (2,664 ft) and Black Mountain 812 m (2,664 ft). The native forest in
3900-464: Is lower and the average income higher; tertiary education levels are higher, while the population is younger. At the 2016 Census, 32% of Canberra's inhabitants were reported as having been born overseas. Canberra's design is influenced by the garden city movement and incorporates significant areas of natural vegetation. Its design can be viewed from its highest point at the Telstra Tower and
4030-436: Is obsolete. None of these specifications define a detailed process or chemistry, but rather a set of tests and quality assurance measures which the anodized product must meet. BS 1615 guides the selection of alloys for anodizing. For British defense work, a detailed chromic and sulfuric anodizing processes are described by DEF STAN 03-24/3 and DEF STAN 03-25/3 respectively. The oldest anodizing process uses chromic acid . It
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4160-494: Is produced by auto-passivation. These pores allow for the dye to be absorbed, however, this must be followed by sealing or the dye will not stay. Dye is typically followed up by a clean nickel acetate seal. Because the dye is only superficial, the underlying oxide may continue to provide corrosion protection even if minor wear and scratches break through the dyed layer. Conditions such as electrolyte concentration, acidity, solution temperature, and current must be controlled to allow
4290-424: Is sensitive to variations in the metallurgy of the underlying alloy and cannot be reproduced consistently. Anodizing in some organic acids, for example malic acid , can enter a 'runaway' situation, in which the current drives the acid to attack the aluminium far more aggressively than normal, resulting in huge pits and scarring. Also, if the current or voltage are driven too high, 'burning' can set in; in this case,
4420-549: Is served with domestic and international flights at Canberra Airport , while interstate train and coach services depart from Canberra railway station and the Jolimont Centre respectively. City Interchange and Alinga Street station form the main hub of Canberra's bus and light rail transport network. The word "Canberra" is derived from the Ngunnawal language of a local Ngunnawal or Ngambri clan who resided in
4550-459: Is the "lightfastness" of organic dyestuffs—some colours (reds and blues) are particularly prone to fading. Black dyes and gold produced by inorganic means ( ferric ammonium oxalate ) are more lightfast . Dyed anodizing is usually sealed to reduce or eliminate dye bleed out. White color cannot be applied due to the larger molecule size than the pore size of the oxide layer. Alternatively, metal (usually tin ) can be electrolytically deposited in
4680-730: Is the only cathedral in Canberra. ) From 1920 to 1957, three bodies — successively the Federal Capital Advisory Committee , the Federal Capital Commission , and the National Capital Planning and Development Committee — continued to plan the further expansion of Canberra in the absence of Griffin. However, they were only advisory and development decisions were made without consulting them, which increased inefficiency. The largest event in Canberra up to World War II
4810-617: Is thus meant to imply that the story of Australia is not one story, but many stories tangled together. The building also refers to or quotes other buildings: The plan of the National Museum of Australia incorporates an exact copy of the lightning-flash zigzag that Libeskind created for the Berlin Museum by breaking a star of David . The Bulletin magazine first publicly raised allegations of plagiarism in June 2000. Libeskind
4940-412: Is typically used to remove smut (residue), but is being replaced because of environmental concerns. The anodized aluminium layer is created by passing a direct current through an electrolytic solution, with the aluminium object serving as the anode (the positive electrode in an electrolytic cell). The current releases hydrogen at the cathode (the negative electrode) and oxygen at the surface of
5070-413: Is usually performed in an acidic solution, typically sulphuric acid or chromic acid, which slowly dissolves the aluminium oxide. The acid action is balanced with the oxidation rate to form a coating with nanopores, 10–150 nm in diameter. These pores are what allow the electrolyte solution and current to reach the aluminium substrate and continue growing the coating to greater thickness beyond what
5200-838: Is widely known as the Bengough-Stuart process but, due to the safety regulations regarding air quality control, is not preferred by vendors when the additive material associated with type II doesn't break tolerances. In North America, it is known as Type I because it is so designated by the MIL-A-8625 standard, but it is also covered by AMS 2470 and MIL-A-8625 Type IB. In the UK it is normally specified as Def Stan 03/24 and used in areas that are prone to come into contact with propellants etc. There are also Boeing and Airbus standards. Chromic acid produces thinner, 0.5 μm to 18 μm (0.00002" to 0.0007") more opaque films that are softer, ductile, and to
5330-414: The 2019/2020 bushfires . On 1 January 2020, Canberra had the worst air quality of any major city in the world, with an AQI of 7700 (USAQI 949). Canberra is a planned city and the inner-city area was originally designed by Walter Burley Griffin , a major 20th-century American architect. Within the central area of the city near Lake Burley Griffin, major roads follow a wheel-and-spoke pattern rather than
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5460-1151: The Australian National University , the Royal Australian Mint , the Australian Institute of Sport , the National Gallery , the National Museum and the National Library . The city is home to many important institutions of the Australian Defence Force including the Royal Military College Duntroon and the Australian Defence Force Academy . It hosts all foreign embassies in Australia as well as regional headquarters of many international organisations, not-for-profit groups, lobbying groups and professional associations. Canberra has been ranked among
5590-517: The Australian environment . Notable objects (as identified by the museum on their website) include: The museum also functions as a temporary repository for the repatriation of ancestral remains. It is involved in projects to return the remains of indigenous Australians, held in the collections of museums across the world, to their communities of origin. These projects have seen the return of over 1,400 remains as of March 2019. On 15 September 2017,
5720-810: The Murrumbidgee north-west of Canberra, which in turn flows north-west toward the New South Wales town of Yass. The Queanbeyan River joins the Molonglo River at Oaks Estate just within the ACT. A number of creeks, including Jerrabomberra and Yarralumla Creeks, flow into the Molonglo and Murrumbidgee. Two of these creeks, the Ginninderra and Tuggeranong, have similarly been dammed to form Lakes Ginninderra and Tuggeranong . Until recently
5850-542: The Sydney 2000 Olympics . It holds the world's largest collection of Aboriginal bark paintings and stone tools, the heart of champion racehorse Phar Lap and the Holden prototype No. 1 car. The museum also develops and travels exhibitions on subjects ranging from bushrangers to surf lifesaving . The National Museum of Australia Press publishes a wide range of books, catalogues and journals. The museum's Research Centre takes
5980-702: The Yarralumla estate—now the site of the official residence of the Governor-General of Australia—in 1827, and John Palmer who employed Duncan Macfarlane to form the Jerrabomberra property in 1828. A year later, John MacPherson established the Springbank estate, becoming the first British owner-occupier in the region. The Anglican church of St John the Baptist , in the suburb of Reid,
6110-488: The districts of Woden Valley and Belconnen commenced in the mid and late 1960s respectively, followed by the district of Tuggeranong in the mid 1970s. Many of the new suburbs were named after Australian politicians such as Barton , Deakin , Reid , Braddon , Curtin , Chifley and Parkes . On 9 May 1988, a larger and permanent Parliament House was opened on Capital Hill as part of Australia's bicentenary celebrations. The Commonwealth Parliament moved there from
6240-512: The federation of the colonies of Australia as the seat of government for the new nation, it is Australia's largest inland city and the eighth-largest Australian city overall . The city is located at the northern end of the Australian Capital Territory at the northern tip of the Australian Alps , the country's highest mountain range. As of June 2023, Canberra's estimated population was 466,566. The area chosen for
6370-657: The iron oxide (actually ferric hydroxide or hydrated iron oxide , also known as rust ) forms by anoxic anodic pits and large cathodic surface, these pits concentrate anions such as sulfate and chloride accelerating the underlying metal to corrosion. Carbon flakes or nodules in iron or steel with high carbon content ( high-carbon steel , cast iron ) may cause an electrolytic potential and interfere with coating or plating. Ferrous metals are commonly anodized electrolytically in nitric acid or by treatment with red fuming nitric acid to form hard black Iron(II,III) oxide . This oxide remains conformal even when plated on wiring and
6500-542: The 100th anniversary of the naming of Canberra. On 11 March 2014, the last day of the centennial year, the Canberra Centenary Column was unveiled in City Hill . Other works included The Skywhale , a hot air balloon designed by the sculptor Patricia Piccinini , and StellrScope by visual media artist Eleanor Gates-Stuart. On 7 February 2021, The Skywhale was joined by Skywhalepapa to create
6630-407: The 1960s. Thicknesses of up to 50 μm can be achieved. Organic acid anodizing is called Type IC by MIL-A-8625. Anodizing can be carried out in phosphoric acid, usually as a surface preparation for adhesives. This is described in standard ASTM D3933. Anodizing can also be performed in borate or tartrate baths in which aluminium oxide is insoluble. In these processes, the coating growth stops when
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#17327728773266760-623: The ACT's first government, led by the Chief Minister Rosemary Follett , who made history as Australia's first female head of government. The 1990s also saw urban development begin in the district of Gungahlin in the far north of the ACT. Parts of Canberra were engulfed by bushfires on 18 January 2003 that killed four people, injured 435 and destroyed more than 500 homes as well as the major research telescopes of Australian National University's Mount Stromlo Observatory . Throughout 2013, several events celebrated
6890-701: The Canberra area include the Ngunnawal , Ngunawal and Ngambri peoples. Other groups claiming a connection to the land include the Ngarigo (who also lived directly to the south) and the Ngambri-Guumaal. Neighbouring groups include the Wandandian to the east, the Walgulu also to the south, Gandangara people to the north and Wiradjuri to the north-west. The first British settlers into the Canberra area described two clans of Ngunnawal people resident to
7020-411: The Canberra region was almost wholly eucalypt species and provided a resource for fuel and domestic purposes. By the early 1960s, logging had depleted the eucalypt, and concern about water quality led to the forests being closed. Interest in forestry began in 1915 with trials of a number of species including Pinus radiata on the slopes of Mount Stromlo. Since then, plantations have been expanded, with
7150-530: The Molonglo River had a history of sometimes calamitous floods; the area was a flood plain prior to the filling of Lake Burley Griffin. Under the Köppen-Geiger classification , Canberra has an oceanic climate ( Cfb ). In January, the warmest month, the average high is approximately 29 °C (84 °F); in July, the coldest month, the average high drops to approximately 12 °C (54 °F). Frost
7280-727: The Ngunnawal elder Don Bell, have speculated upon possible meanings of "Canberra" over the years. These include "meeting place", "woman's breasts" and "the hollow between a woman's breasts". Alternative proposals for the name of the city during its planning included Austral, Australville, Aurora, Captain Cook, Caucus City, Cookaburra, Dampier, Eden, Eucalypta, Flinders, Gonebroke, Home, Hopetoun, Kangaremu, Myola, Meladneyperbane, New Era, Olympus, Paradise, Shakespeare, Sydmelperadbrisho, Swindleville, The National City, Union City, Unison, Wattleton, Wheatwoolgold, Yass-Canberra. The first peoples of
7410-722: The Provisional Parliament House, now known as Old Parliament House. In December 1988, the Australian Capital Territory was granted full self-government by the Commonwealth Parliament, a step proposed as early as 1965. Following the first election on 4 March 1989, a 17-member Legislative Assembly sat at temporary offices at 1 Constitution Avenue, Civic, on 11 May 1989. Permanent premises were opened on London Circuit in 1994. The Australian Labor Party formed
7540-468: The ability to retain dye. Although anodizing only has moderate wear resistance, the deeper pores can better retain a lubricating film than a smooth surface would. Anodized coatings have a much lower thermal conductivity and coefficient of linear expansion than aluminium. As a result, the coating will crack from thermal stress if exposed to temperatures above 80 °C (353 K). The coating can crack, but it will not peel. The melting point of aluminium oxide
7670-544: The aluminium anode, creating a build-up of aluminium oxide. Alternating current and pulsed current is also possible but rarely used. The voltage required by various solutions may range from 1 to 300 V DC, although most fall in the range of 15 to 21 V. Higher voltages are typically required for thicker coatings formed in sulfuric and organic acid. The anodizing current varies with the area of aluminium being anodized and typically ranges from 30 to 300 A / m . Aluminium anodizing (eloxal or El ectrolytic Ox idation of Al uminium)
7800-427: The annual Australian Tourism Awards, the National Museum was named Australia's Major Tourist Attraction in both 2005 and 2006. The museum was named winner of the Canberra and Capital Region's Tourism Award for Major Tourist Attraction five years running from 2003 to 2007. Canberra Canberra ( / ˈ k æ n b ər ə / KAN -bər-ə ) is the capital city of Australia . Founded following
7930-400: The area 21,000 years previously. Still today, Ngunnawal men into the present conduct ceremony on the banks of the river, Murrumbidgee River. They travel upstream as they receive their Totems and corresponding responsibilities for land management. 'Murrum' means 'Pathway' and Bidgee means 'Boss'. The submerged limestone caves beneath Lake Burley Griffin contained Aboriginal rock art, some of
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#17327728773268060-494: The area and were referred to by the early British colonists as either the Canberry , Kanberri or Nganbra tribe. Joshua John Moore , the first European land-owner in the region, named his grant "Canberry" in 1823 after these people. "Canberry Creek" and "Canberry" first appeared on regional maps from 1830, while the derivative name "Canberra" started to appear from around 1857. Numerous local commentators, including
8190-690: The area around Parnngurr in Western Australia , showing the seasons, cultural burning practices and Indigenous management of the land and natural resources. In June 2022, the work was projected onto the Sydney Opera House as part of the Vivid Sydney festival. The exhibition ran until February 2018, and travelled to Berlin, Germany, in 2022 and is due to be shown in Paris, France, in 2023. Other past exhibitions include: In
8320-425: The base metal converted. This will generally not be of consequence except where there are tight tolerances. If so, the thickness of the anodizing layer has to be taken into account when choosing the machining dimension. A general practice on engineering drawing is to specify that "dimensions apply after all surface finishes". This will force the machine shop to take into account the anodization thickness when performing
8450-677: The benefit of reducing erosion in the Cotter catchment, and the forests are also popular recreation areas. The urban environs of the city of Canberra straddle the Ginninderra plain , Molonglo plain , the Limestone plain, and the Tuggeranong plain (Isabella's Plain). The Molonglo River which flows across the Molonglo plain has been dammed to form the national capital's iconic feature Lake Burley Griffin . The Molonglo then flows into
8580-538: The board advised that it could not support the Griffins' plan in its entirety and suggested an alternative plan of its own devising. This plan ostensibly incorporated the best features of the three place-getting designs as well as of a fourth design by H. Caswell, R.C.G. Coulter and W. Scott-Griffiths of Sydney, the rights to which it had purchased. It was this composite plan that was endorsed by Parliament and given formal approval by O'Malley on 10 January 1913. However, it
8710-424: The byproducts found in the effluent streams of other processes come from their dyes or plating materials. The most common anodizing effluents, aluminium hydroxide and aluminium sulfate , are recycled for the manufacturing of alum, baking powder, cosmetics, newsprint and fertilizer or used by industrial wastewater treatment systems. Anodizing will raise the surface since the oxide created occupies more space than
8840-448: The capital had been inhabited by Aboriginal Australians for up to 21,000 years, by groups including the Ngunnawal and Ngambri . European settlement commenced in the first half of the 19th century, as evidenced by surviving landmarks such as St John's Anglican Church and Blundells Cottage . On 1 January 1901, federation of the colonies of Australia was achieved. Following a long dispute over whether Sydney or Melbourne should be
8970-532: The chromate coating must remain intact. Beyond that, the chromate coating is then dissolved in unmasked areas. The component can then be anodized, with anodizing taking to the unmasked areas. The exact process will vary dependent on service provider, component geometry and required outcome. It helps to protect aluminium article. The most widely used anodizing specification in the US is a U.S. military spec , MIL-A-8625, which defines three types of aluminium anodizing. Type I
9100-430: The city for poor performance. Menzies remained in office for over a decade and in that time the development of the capital sped up rapidly. The population grew by more than 50 per cent in every five-year period from 1955 to 1975. Several Government departments, together with public servants, were moved to Canberra from Melbourne following the war. Government housing projects were undertaken to accommodate
9230-552: The city in two; a land axis perpendicular to the central basin stretches from Capital Hill —the eventual location of the new Parliament House on a mound on the southern side—north northeast across the central basin to the northern banks along Anzac Parade to the Australian War Memorial . This was designed so that looking from Capital Hill, the War Memorial stood directly at the foot of Mount Ainslie . At
9360-439: The city's growing population. The National Capital Development Commission (NCDC) formed in 1957 with executive powers and ended four decades of disputes over the shape and design of Lake Burley Griffin — the centrepiece of Griffin's design — and construction was completed in 1964 after four years of work. The completion of the lake finally laid the platform for the development of Griffin's Parliamentary Triangle . Since
9490-547: The coating is susceptible to chemical dissolution in the presence of high- and low- pH chemistry, which results in stripping the coating and corrosion of the substrate. To combat this, various techniques have been developed either to reduce the number of fissures, to insert more chemically stable compounds into the oxide, or both. For instance, sulphuric-anodized articles are normally sealed, either through hydro-thermal sealing or precipitating sealing, to reduce porosity and interstitial pathways that allow corrosive ion exchange between
9620-725: The exhibition Songlines: Tracking the Seven Sisters , referencing the creation myth of the Seven Sisters that is common to many groups in the Western and Central Deserts , was launched at the NMA. It was instigated by aṉangu people, and was a collaboration with Aboriginal elders who are custodians of the Dreamtime story. The exhibition included a huge painting called Yarrkalpa — Hunting Ground , which symbolically depicts
9750-485: The film thickness is dependent on the anodizing voltage. Uses include jewelry and commemorative coins . Tantalum anodizes similarly to titanium and niobium with a range of attractive colours being formed by interference at different film thicknesses. Again the film thickness is dependent on the anodizing voltage and typically ranges from 18 to 23 Angstroms per volt depending on electrolyte and temperature. Uses include tantalum capacitors . An anodized oxide layer has
9880-416: The final machining of the mechanical part before anodization. Also in the case of small holes threaded to accept screws , anodizing may cause the screws to bind, thus the threaded holes may need to be chased with a tap to restore the original dimensions. Alternatively, special oversize taps may be used to precompensate for this growth. In the case of unthreaded holes that accept fixed-diameter pins or rods,
10010-606: The first sulfuric acid anodizing process was patented by Gower and O'Brien in 1927. Sulfuric acid soon became and remains the most common anodizing electrolyte. Oxalic acid anodizing was first patented in Japan in 1923 and later widely used in Germany, particularly for architectural applications. Anodized aluminium extrusion was a popular architectural material in the 1960s and 1970s, but has since been displaced by cheaper plastics and powder coating . The phosphoric acid processes are
10140-403: The floor. The water also damaged several paintings by a Sydney artist which were associated with an exhibition about Australian lifesavers. However, the main part of the building was unaffected and nothing from the museum's collection was damaged. The building was re-opened to the public a day later. The damage was expected to cost at least A$ 500,000 to repair. In 2012, building works commenced on
10270-459: The formation of a consistent oxide layer. Harder, thicker films tend to be produced by more concentrated solutions at lower temperatures with higher voltages and currents. The film thickness can range from under 0.5 micrometres for bright decorative work up to 150 micrometres for architectural applications. Anodizing can be performed in combination with chromate conversion coating . Each process provides corrosion resistance, with anodizing offering
10400-482: The growth of a boy into a man. In October 1820, Charles Throsby led the first British expedition to the area. Four other expeditions occurred between 1820 and 1823 with the first accurate map being produced by explorer Mark John Currie in June 1823. By this stage the area had become known as the Limestone Plains. British settlement of the area probably dates from late 1823, when a sheep station
10530-721: The initial construction of the lake, various buildings of national importance have been constructed on its shores. The newly built Australian National University was expanded and sculptures as well as monuments were built. A new National Library was constructed within the Parliamentary Triangle, followed by the High Court and the National Gallery . Suburbs in Canberra Central (often referred to as North Canberra and South Canberra ) were further developed in the 1950s and urban development in
10660-416: The interference between light reflected from the water-oil interface and the oil film's surface. Because the oil film's thickness isn't regulated, the resulting rainbow color appears random. In the anodizing coloring of aluminum, desired colors are achieved by depositing a controllably thick metal layer (typically tin) at the base of the porous structure. This involves reflections on the aluminum substrate and
10790-399: The issue of grounding components as part of a larger system is an obvious one. The dual finishing process uses the best each process has to offer, anodizing with its hard wear resistance and chromate conversion coating with its electrical conductivity. The process steps can typically involve chromate conversion coating the entire component, followed by a masking of the surface in areas where
10920-428: The messages are "mate" and "she'll be right". Also included were such controversial words and phrases as "sorry" and "forgive us our genocide". These more controversial messages have been obscured with silver discs being attached to the surface making the braille illegible. Among the phrases in braille are the words "Resurrection city". The phrase may refer to the clearing of the former Canberra Hospital to make way for
11050-553: The most recent major development, so far only used as pretreatments for adhesives or organic paints. A wide variety of proprietary and increasingly complex variations of all these anodizing processes continue to be developed by industry, so the growing trend in military and industrial standards is to classify by coating properties rather than by process chemistry. Aluminium alloys are anodized to increase corrosion resistance and to allow dyeing (colouring), improved lubrication , or improved adhesion . However, anodizing does not increase
11180-422: The mountains. The area is generally sheltered from a westerly wind, though strong northwesterlies can develop. A cool, vigorous afternoon easterly change, colloquially referred to as a 'sea-breeze' or the 'Braidwood Butcher', is common during the summer months and often exceeds 40 km/h in the city. Canberra is also less humid than the nearby coastal areas. Canberra was severely affected by smoke haze during
11310-594: The museum or it could be a reference to reconciliation between Indigenous Australians and European settlers. The phrase is used as a label in tiles on another of Raggett's buildings, the Storey Hall in Melbourne. Raggett says of that message: "I guess that tries to be some big sort of theme for this building as well and its sort of set of memories." It was built by Bovis Lend Lease and completed in 2001. Art critic Christopher Allen described it as "undoubtedly
11440-400: The national capital started during debates over federation in the late 19th century. Following a long dispute over whether Sydney or Melbourne should be the national capital, a compromise was reached: the new capital would be built in New South Wales, so long as it was at least 100 mi (160 km) from Sydney, with Melbourne to be the temporary seat of government while the new capital
11570-569: The national capital, a compromise was reached: the new capital would be built in New South Wales , so long as it was at least 100 mi (160 km) from Sydney. The capital city was founded and formally named as Canberra in 1913. A plan by the American architects Walter Burley Griffin and Marion Mahony Griffin was selected after an international design contest, and construction commenced in 1913. Unusual among Australian cities, it
11700-521: The northern side of the city, was designated the municipal axis. The municipal axis became the location of Constitution Avenue , which links City Hill in Civic Centre and both Market Centre and the Defence precinct on Russell Hill. Commonwealth Avenue and Kings Avenue were to run from the southern side from Capital Hill to City Hill and Market Centre on the north respectively, and they formed
11830-432: The obsolete AMS 2468 and DEF STAN 03-26/1. Anodizing can produce yellowish integral colours without dyes if it is carried out in weak acids with high voltages, high current densities, and strong refrigeration. Shades of colour are restricted to a range which includes pale yellow, gold, deep bronze, brown, grey, and black. Some advanced variations can produce a white coating with 80% reflectivity. The shade of colour produced
11960-430: The only sites in the region. Galambary (Black Mountain) is an important Aboriginal meeting and business site, predominantly for men's business. According to the Ngunnawal and Ngambri people, Mt Ainslie is primarily for place of women's business. Black Mountain and Mount Ainslie are referred to as women's breasts. Galambary was also used by Ngunnawal people as an initiation site, with the mountain itself said to represent
12090-1060: The oxide (which is determined by the anodizing voltage); it is caused by the interference of light reflecting off the oxide surface with light travelling through it and reflecting off the underlying metal surface. AMS 2488 Type II anodizing produces a thicker matte grey finish with higher wear resistance. Zinc is rarely anodized, but a process was developed by the International Lead Zinc Research Organization and covered by MIL-A-81801. A solution of ammonium phosphate , chromate and fluoride with voltages of up to 200 V can produce olive green coatings up to 80 μm thick. The coatings are hard and corrosion resistant. Zinc or galvanized steel can be anodized using DC at lower voltages (20–30 V) in silicate baths containing varying concentrations of sodium silicate , sodium hydroxide , borax , sodium nitrite , and nickel sulphate . The most common anodizing processes, for example, sulphuric acid on aluminium, produce
12220-547: The part is fully covered, and the thickness is linearly related to the voltage applied. These coatings are free of pores, relative to the sulfuric and chromic acid processes. This type of coating is widely used to make electrolytic capacitors because the thin aluminium films (typically less than 0.5 μm) would risk being pierced by acidic processes. Plasma electrolytic oxidation is a similar process, but where higher voltages are applied. This causes sparks to occur and results in more crystalline/ceramic type coatings. Magnesium
12350-674: The pastoral property of Yarralumla in 1913 to provide an official residence for the Governor-General of Australia in the new capital. Renovations began in 1925 to enlarge and modernise the property. In 1927, the property was officially dubbed Government House. On 9 May that year, the Commonwealth parliament moved to Canberra with the opening of the Provisional Parliament House . The Prime Minister Stanley Bruce had officially taken up residence in The Lodge
12480-414: The pores of the anodic coating to provide more lightfast colours. Metal dye colors range from pale champagne to black . Bronze shades are commonly used for architectural metals . Alternatively, the colour may be produced integral to the film. This is done during the anodizing process using organic acids mixed with the sulfuric electrolyte and a pulsed current. Splash effects are created by dying
12610-406: The project), the museum building is based on a theme of knotted ropes, symbolically bringing together the stories of Australians. The architects stated: "We liked to think that the story of Australia was not one, but many tangled together. Not an authorized version but a puzzling confluence; not merely the resolution of difference but its wholehearted embrace." The building is meant to be the centre of
12740-486: The region. Around 1825 James Ainslie , working on behalf of the wealthy merchant Robert Campbell , arrived to establish a sheep station. He was guided to the region by a local Aboriginal girl who showed him the fine lands of her Pialligo clan. The area then became the property of Campbell and it was initially named Pialligo before Campbell changed it to the Scottish title of Duntroon . Campbell and his family built
12870-571: The required territory as they did not accept the site. In 1906, the New South Wales Government finally agreed to cede sufficient land provided that it was in the Yass-Canberra region as this site was closer to Sydney. Newspaper proprietor John Gale circulated a pamphlet titled 'Dalgety or Canberra: Which?' advocating Canberra to every member of the Commonwealth's seven state and federal parliaments. By many accounts, it
13000-465: The seat of the Government of Australia , Canberra is home to many important institutions of the federal government, national monuments and museums. These include Parliament House , Government House , the High Court building and the headquarters of numerous government agencies. It is the location of many social and cultural institutions of national significance such as the Australian War Memorial ,
13130-414: The side of the majority of the board with the design by Walter Burley Griffin and Marion Mahony Griffin of Chicago , Illinois , United States , being declared the winner. Second was Eliel Saarinen of Finland and third was Alfred Agache of Brazil but resident in Paris, France. O'Malley then appointed a six-member board to advise him on the implementation of the winning design. On 25 November 1912,
13260-404: The site with the Canberra city plan by Walter Burley Griffin and the spiritual heart of indigenous Australia. The shape of the main entrance hall continues this theme: it is as though the otherwise rectangular building has been built encasing a complex knot which does not quite fit inside the building, and then the knot taken away. The entirely non-symmetrical complex is designed to not look like
13390-408: The southwestern end of the land axis was Bimberi Peak , the highest mountain in the ACT, approximately 52 km (32 mi) south west of Canberra. The straight edge of the circular segment that formed the central basin of Lake Burley Griffin was perpendicular to the land axis and designated the water axis, and it extended northwest towards Black Mountain . A line parallel to the water axis, on
13520-500: The strength of the aluminium object. The anodic layer is insulative . When exposed to air at room temperature, or any other gas containing oxygen, pure aluminium self-passivates by forming a surface layer of amorphous aluminium oxide 2 to 3 nm thick, which provides very effective protection against corrosion. Aluminium alloys typically form a thicker oxide layer, 5–15 nm thick, but tend to be more susceptible to corrosion. Aluminium alloy parts are anodized to greatly increase
13650-788: The summit of Mount Ainslie. Other notable features include the National Arboretum , born out of the 2003 Canberra bushfires , and Lake Burley Griffin , named for Walter Burley Griffin. Highlights in the annual calendar of cultural events include Floriade , the largest flower festival in the Southern Hemisphere, the Enlighten Festival , Skyfire , the National Multicultural Festival and Summernats . Canberra's main sporting venues are Canberra Stadium and Manuka Oval . The city
13780-436: The supplies act as if nearly shorted and large, uneven and amorphous black regions develop. Integral colour anodizing is generally done with organic acids, but the same effect has been produced in laboratories with very dilute sulfuric acid. Integral colour anodizing was originally performed with oxalic acid , but sulfonated aromatic compounds containing oxygen, particularly sulfosalicylic acid , have been more common since
13910-712: The surface and the substrate. Precipitating seals enhance chemical stability but are less effective in eliminating ionic exchange pathways. Most recently, new techniques to partially convert the amorphous oxide coating into more stable micro-crystalline compounds have been developed that have shown significant improvement based on shorter bond lengths. Some aluminium aircraft parts, architectural materials, and consumer products are anodized. Anodized aluminium can be found on MP3 players , smartphones , multi-tools , flashlights , cookware , cameras , sporting goods , firearms , window frames , roofs , in electrolytic capacitors, and on many other products both for corrosion resistance and
14040-416: The thickness of this layer for corrosion resistance. The corrosion resistance of aluminium alloys is significantly decreased by certain alloying elements or impurities: copper , iron , and silicon , so 2000-, 4000-, 6000 and 7000-series Al alloys tend to be most susceptible. Although anodizing produces a very regular and uniform coating, microscopic fissures in the coating can lead to corrosion. Further,
14170-406: The ugliest example of official architecture in Australia... a painful example of inept, clumsy and gratuitous form justified by kitsch symbolism". A severe thunderstorm hit Canberra on the afternoon of 29 December 2006 and caused roof damage to the administration section of the museum. The ceiling collapsed under the weight of hail. The damage exposed power cables and left two centimetres of water on
14300-401: The unsealed porous surface in lighter colours and then splashing darker colour dyes onto the surface. Aqueous and solvent-based dye mixtures may also be alternately applied since the coloured dyes will resist each other and leave spotted effects. Another interesting coloring method is anodizing interference coloring. The thin oil film resting on the water's surface displays a rainbow hue due to
14430-403: The upper metal surface. The color resulting from interference shifts from blue, green, and yellow to red as the deposited metal layer thickens. Beyond a specific thickness, the optical interference vanishes, and the color turns bronze. Interference-colored anodized aluminum parts exhibit a distinctive quality: their color varies when viewed from different angles. The interference coloring involves
14560-664: The vicinity. The Canberry or Nganbra clan lived mostly around Sullivan's Creek and had ceremonial grounds at the base of Galambary ( Black Mountain ), while the Pialligo clan had land around what is now Canberra Airport . The people living here carefully managed and cultivated the land with fire and farmed yams and hunted for food. Archaeological evidence of settlement in the region includes inhabited rock shelters, rock paintings and engravings, burial places, camps and quarry sites as well as stone tools and arrangements. Artefacts suggests early human activity occurred at some point in
14690-460: The war ended. The urban areas of Canberra are organised into a hierarchy of districts, town centres, group centres, local suburbs as well as other industrial areas and villages. There are seven residential districts, each of which is divided into smaller suburbs, and most of which have a town centre which is the focus of commercial and social activities. The districts were settled in the following chronological order: Anodising Anodizing
14820-467: The west by the Brindabellas which create a strong rain shadow in Canberra's valleys. Canberra gets 100.4 clear days annually. Annual rainfall is the third lowest of the capital cities (after Adelaide and Hobart ) and is spread fairly evenly over the seasons, with late spring bringing the highest rainfall. Thunderstorms occur mostly between October and April, owing to the effect of summer and
14950-680: The western and eastern edges of the central basin. The area enclosed by the three avenues was known as the Parliamentary Triangle , and formed the centrepiece of Griffin's work. The Griffins assigned spiritual values to Mount Ainslie, Black Mountain, and Red Hill and originally planned to cover each of these in flowers. That way each hill would be covered with a single, primary colour which represented its spiritual value. This part of their plan never came to fruition, as World War I slowed construction and planning disputes led to Griffin's dismissal by Prime Minister Billy Hughes after
15080-458: The wife of Governor-General Lord Denman , announced that the city would be named "Canberra" at a ceremony at Kurrajong Hill, which has since become Capital Hill and the site of the present Parliament House . Canberra Day is a public holiday observed in the ACT on the second Monday in March to celebrate the founding of Canberra. After the ceremony, bureaucratic disputes hindered Griffin's work;
15210-705: The wiring is bent. Anodizing changes the microscopic texture of the surface and the crystal structure of the metal near the surface. Thick coatings are normally porous, so a sealing process is often needed to achieve corrosion resistance . Anodized aluminium surfaces, for example, are harder than aluminium but have low to moderate wear resistance that can be improved with increasing thickness or by applying suitable sealing substances. Anodic films are generally much stronger and more adherent than most types of paint and metal plating, but also more brittle. This makes them less likely to crack and peel from ageing and wear, but more susceptible to cracking from thermal stress. Anodizing
15340-483: The world's best cities to live in and visit. Although the Commonwealth Government remains the largest single employer in Canberra, it is no longer the majority employer. Other major industries have developed in the city, including in health care, professional services, education and training, retail, accommodation and food, and construction. Compared to the national averages, the unemployment rate
15470-412: Was 44.0 °C (111.2 °F) on 4 January 2020. Winter 2011 was Canberra's warmest winter on record, approximately 2 °C (4 °F) above the average temperature. The lowest recorded minimum temperature was −10.0 °C (14.0 °F) on the morning of 11 July 1971. Light snow falls only once in every few years, and is usually not widespread and quickly dissipates. Canberra is protected from
15600-720: Was boycotted by the Royal Institute of British Architects , the Institution of Civil Engineers and their affiliated bodies throughout the British Empire because the Minister for Home Affairs King O'Malley insisted that the final decision was for him to make rather than an expert in city planning. A total of 137 valid entries were received. O'Malley appointed a three-member board to advise him but they could not reach unanimity. On 24 May 1911, O'Malley came down on
15730-601: Was built to educate local settlers children, including the Blundell children who lived in nearby Blundell's Cottage . As the European presence increased, the Indigenous population dwindled largely due to the destruction of their society, dislocation from their lands and from introduced diseases such as influenza , smallpox , alcoholism and measles . The district's change from a rural area in New South Wales to
15860-455: Was built. A survey was conducted across several sites in New South Wales with Bombala , southern Monaro , Orange , Yass , Albury , Tamworth , Armidale , Tumut and Dalgety all discussed. Dalgety was chosen by the federal parliament and it passed the Seat of Government Act 1904 confirming Dalgety as the site of the nation's capital. However, the New South Wales government refused to cede
15990-521: Was completed in mid-2013. The new building is clad in brightly coloured tiles arranged in a QR code pattern. The museum's collection, known as the National Historical Collection, includes over 210,000 objects. The collection focuses on three themes: the culture and history of Aboriginal and Torres Strait Islander peoples, Australian history and culture since European settlement in 1788 , and interactions between people and
16120-422: Was consecrated in 1845 and is now the oldest surviving public building in the city. St John's churchyard contains the earliest graves in the district. It has been described as a "sanctuary in the city", remaining a small English village-style church even as the capital grew around it. Canberra's first school, St John's School (now a museum), was situated next to the church and opened in the same year of 1845. It
16250-558: Was decisive in the selection of Canberra as the site in 1908 as was a result of survey work done by the government surveyor Charles Scrivener . The NSW government ceded the district to the federal government in 1911 and the Federal Capital Territory was established. An international design competition was launched by the Department of Home Affairs on 30 April 1911, closing on 31 January 1912. The competition
16380-526: Was first used on an industrial scale in 1923 to protect Duralumin seaplane parts from corrosion. This early chromic acid –based process was called the Bengough–Stuart process and was documented in British defence specification DEF STAN 03-24/3. It is still used today despite its legacy requirements for a complicated voltage cycle now known to be unnecessary. Variations of this process soon evolved, and
16510-514: Was formed on what is now the Acton Peninsula by James Cowan, the head stockman employed by Joshua John Moore . Moore had received a land grant in the region in 1823 and formally applied to purchase the site on 16 December 1826. He named the property "Canberry". On 30 April 1827, Moore was told by letter that he could retain possession of 1,000 acres (405 ha) at Canberry. Other colonists soon followed Moore's example to take up land in
16640-435: Was reported to be angry with the copying. Raggatt's defence against plagiarism was that the design was a quotation rather than a copy. The director of the museum, Dawn Casey, stated that she and her council were not aware of this symbolism when they approved the plan. The exterior of the building is covered in anodised aluminium panels. Many of the panels include words written in braille and other decorative devices. Among
16770-562: Was the 24th Meeting of ANZAAS in January 1939. The Canberra Times described it as "a signal event ... in the history of this, the world's youngest capital city". The city's accommodation was not nearly sufficient to house the 1,250 delegates and a tent city had to be set up on the banks of the Molonglo River. One of the prominent speakers was H. G. Wells , who was a guest of the Governor-General Lord Gowrie for
16900-512: Was the Griffin plan which was ultimately proceeded with. In 1913, Walter Burley Griffin was appointed Federal Capital Director of Design and Construction and construction began. On 23 February, King O'Malley drove the first peg in the construction of the future capital city. In 1912, the government invited suggestions from the public as to the name of the future city. Almost 750 names were suggested. At midday on 12 March 1913, Lady Denman ,
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