La Giudecca [la dʒuˈdɛkka] was a term used In Southern Italy and Sicily to identify any urban district (or a portion of a village) where Jewish communities dwelled and had their synagogues and businesses.
99-414: Unlike the compulsory ghettos of Northern Italy and elsewhere, in some Southern Italian hamlets and cities Jewish families and their members voluntarily chose to live in certain areas but were free to travel and even contribute together with their Christian neighbours to the success or commercial, cultural and artistic progress of a region . A very few Sicilian Giudeccas were unhealthy and declined, in fact,
198-531: A residentially segregated society in which black people and white people inhabit different neighborhoods of significantly different quality. Many of these neighborhoods are located in Northern and Western cities where African Americans moved during the Great Migration (1914–1970), a period when over a million African-Americans moved out of the rural southern United States to escape the widespread racism of
297-604: A decree ordering the dissolution of all Jüdische Wohnbezirke /ghettos in the East and their transference to Nazi concentration camps or their extermination. The Nazi ghettos were an essentially different institution than the historical ghettos of European society. The historical ghettos were places where Jews lived for many generations and created their own culture – even if they were under social and political conditions of segregation and discrimination. The Nazi ghettos were part of The Final Solution ; they were intended as
396-500: A dramatic decline of manufacturing jobs, which had formerly provided good livings for unionized, working-class blacks and whites. The once thriving northern and western industrial cities survived by a gradual shift to service and financial occupations. Subsidized highways and suburban development in the postwar period had pulled many middle and upper-class families and related businesses to the suburbs . Those who could not afford to move were left with disrupted neighborhoods and economies in
495-411: A growing urban populace, group conflict and competition over limited jobs and space, the inability for many residents to compete for new technology-based jobs, and tensions between the public and private sectors left to the formation and growth of U.S. ghettos. The cumulative economic and social forces in ghettos give way to social, political and economic isolation and inequality, while indirectly defining
594-544: A large increase in the residential racial segregation and urban decay in the United States. The creation of new highways in some cases divided and isolated black neighborhoods from goods and services, many times within industrial corridors. For example, Birmingham, Alabama 's interstate highway system attempted to maintain the racial boundaries that had been established by the city's 1926 racial zoning law. The construction of interstate highways through black neighborhoods in
693-500: A material. Heat treatment techniques include annealing , case-hardening , precipitation strengthening , tempering , and quenching . Although the term "heat treatment" applies only to processes where the heating and cooling are done for the specific purpose of altering properties intentionally, heating and cooling often occur incidentally during other manufacturing processes such as hot forming or welding. After degating and heat treating, sand or other molding media may remain adhered to
792-455: A minority making up less than a third of the local population. By 2001, two London boroughs— Newham and Brent —had " minority majority " populations, and most parts of the city tend to have a diverse population. Historically, some parts of London have long been noted for the prevalence of a particular ethnic or religious group (such as the Jewish communities of Golders Green and other parts of
891-430: A mold yields leftover metal — including heads, risers, and sprue (sometimes collectively called sprue) — that can exceed 50% of the metal required to pour a full mold. Since this metal must be remelted as salvage, the yield of a particular gating configuration becomes an important economic consideration when designing various gating schemes, to minimize the cost of excess sprue, and thus overall melting costs. Heat treating
990-476: A particular ethnicity or race, vulnerability to crime, social problems, governmental reliance and political disempowerment. Sharon Zukin explains that through these reasons, society rationalizes the term "bad neighborhoods." Zukin stresses that these circumstances are largely related to "racial concentration, residential abandonment, and de-constitution and reconstitution of communal institutions." Many scholars diagnose this poorly facilitated and fragmented view of
1089-552: A pattern of socioeconomic polarization. Ghettos, in short, instill a cultural adaptation to social and class-based inequalities, reducing the ability of future generations to mobilize or migrate . An alternative theory put forward by Thomas Sowell in Black Rednecks and White Liberals asserts that modern urban black ghetto culture is rooted in the white Cracker culture of the North Britons and Scots-Irish who migrated from
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#17328553708241188-569: A result, Jews were placed under strict regulations throughout many European cities. In some cases, the ghetto was a Jewish quarter with a relatively affluent population (for instance the Jewish ghetto in Venice). In other cases, ghettos were places of terrible poverty. During periods of population growth, ghettos (as that of Rome ) had narrow streets and tall, crowded houses. Residents generally were allowed to administer their own justice system based on Jewish traditions and elders. During World War II ,
1287-466: A separation between superior and inferior status of groups. In response to the influx of black people from the South, banks, insurance companies, and businesses began denying or increasing the cost of services, such as banking , insurance , access to jobs, access to health care , or even supermarkets to residents in certain, often racially determined, areas. The most devastating form of redlining , and
1386-424: A single piece or solid pattern. More complex designs are made in two parts, called split patterns. A split pattern has a top or upper section, called a cope, and a bottom or lower section called a drag. Both solid and split patterns can have cores inserted to complete the final part shape. Cores are used to create hollow areas in the mold that would otherwise be impossible to achieve. Where the cope and drag separates
1485-426: A steel foundry will use an EAF or induction furnace. Bronze or brass foundries use crucible furnaces or induction furnaces. Most aluminium foundries use either electric resistance or gas heated crucible furnaces or reverberatory furnaces. Degassing is a process that may be required to reduce the amount of hydrogen present in a batch of molten metal. Gases can form in metal castings in one of two ways: Hydrogen
1584-491: A total and fierce devastation. The incitement that echoed through the streets was: "Hurrah for Mary! Death to the Jews!" ( Viva Maria! Morte ai Giudei! ) [5] Ghetto A ghetto is a part of a city in which members of a minority group are concentrated, especially as a result of political, social, legal, religious, environmental or economic pressure. Ghettos are often known for being more impoverished than other areas of
1683-552: A transitional stage – first confine each city's Jews in one easily accessible and controllable location, then "liquidate" the ghetto and send the Jews to an extermination camp. Most Nazi ghettos were liquidated in 1943; some, such as that of Łódź , persisted until 1944; very few, e.g. the Budapest Ghetto and the Theresienstadt Ghetto , existed until the end of the war in 1945. There are many Roma ghettos in
1782-511: Is white , has been cited as an example of a 'ghetto', but in reality the area is home to a number of different ethnic groups and religious groups . Analysis of data from Census 2001 revealed that only two wards in England and Wales , both in Birmingham , had one dominant non-white ethnic group comprising more than two-thirds of the local population, but there were 20 wards where whites were
1881-401: Is a common contaminant for most cast metals. It forms as a result of material reactions or from water vapor or machine lubricants. If the hydrogen concentration in the melt is too high, the resulting casting will be porous; the hydrogen will exit the molten solution, leaving minuscule air pockets, as the metal cools and solidifies. Porosity often seriously deteriorates the mechanical properties of
1980-416: Is a group of industrial and metalworking processes used to alter the physical, and sometimes chemical, properties of a material. The most common application is metallurgical. Heat treatments are also used in the manufacture of many other materials, such as glass. Heat treatment involves the use of heating or chilling, normally to extreme temperatures, to achieve a desired result such as hardening or softening of
2079-542: Is a suburb of a large city . Banlieues are divided into autonomous administrative entities and do not constitute part of the city proper . For instance, 80% of the inhabitants of the Paris area live outside the city of Paris . Like the city centre, suburbs may be rich, middle-class or poor — Versailles , Le Vésinet , Maisons-Laffitte and Neuilly-sur-Seine are affluent banlieues of Paris , while Clichy-sous-Bois , Bondy and Corbeil-Essonnes are less so. However, since
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#17328553708242178-410: Is also known as a casting, which is ejected or broken out of the mold to complete the process. Casting is most often used for making complex shapes that would be difficult or uneconomical to make by other methods. Melting is performed in a furnace . Virgin material, external scrap, internal scrap, and alloying elements are used to charge the furnace. Virgin material refers to commercially pure forms of
2277-463: Is called the parting line . When making a pattern it is best to taper the edges so that the pattern can be removed without breaking the mold. This is called draft . The opposite of draft is an undercut where there is part of the pattern under the mold material, making it impossible to remove the pattern without damaging the mold. The pattern is made of wax, wood, plastic, or metal. The molds are constructed by several different processes dependent upon
2376-567: Is common to paint castings to prevent corrosion and improve visual appeal. Some foundries assemble castings into complete machines or sub-assemblies. Other foundries weld multiple castings or wrought metals together to form a finished product. More and more, finishing processes are being performed by robotic machines, which eliminate the need for a human to physically grind or break parting lines, gating material, or feeders. Machines can reduce risk of injury to workers and lower costs for consumables — while also increasing productivity. They also limit
2475-546: Is dependent on the alloy system quantities produced. For ferrous materials EAFs, cupolas, and induction furnaces are commonly used. Reverberatory and crucible furnaces are common for producing aluminium, bronze, and brass castings. Furnace design is a complex process, and the design can be optimized based on multiple factors. Furnaces in foundries can be any size, ranging from small ones used to melt precious metals to furnaces weighing several tons, designed to melt hundreds of pounds of scrap at one time. They are designed according to
2574-522: Is dependent upon prejudice and segregationist patterns established in the South prior to World War I, where most African Americans were disenfranchised by the turn of the century and deprived of political power. After the exodus of African Americans to the North during and after World War I, they had to compete with numerous European immigrants; thus, African-Americans were diminished to unskilled jobs. The slow rate of advancement in black communities outlines
2673-645: Is from the Italian Egitto (' Egypt ', from Latin: Aegyptus ), possibly in memory of the exile of the Israelites in Egypt. The character of ghettos has varied through times. The term was used for an area known as the Jewish quarter, which meant the area of a city traditionally inhabited by Jews in the diaspora . Jewish quarters, like the Jewish ghettos in Europe, were often the outgrowths of segregated ghettos instituted by
2772-541: Is then removed from its mold. Where the mold is sand based, this can be done by shaking or tumbling. This frees the casting from the sand, which is still attached to the metal runners and gates — which are the channels through which the molten metal traveled to reach the component itself. Degating is the removal of the heads, runners, gates, and risers from the casting. Runners, gates, and risers may be removed using cutting torches , bandsaws , or ceramic cutoff blades. For some metal types, and with some gating system designs,
2871-578: Is usually used to refer to areas in developing countries that suffer from absolute poverty , while the term ghetto is used to refer to areas of developed countries that suffer from relative poverty . The word ghetto comes from the Jewish area of Venice , the Venetian Ghetto in Cannaregio (1516–1797). By 1899, the term had been extended to crowded urban quarters of other minority groups. The etymology of
2970-687: The European Union . The Czech government estimates that there are approximately 830 Roma ghettos in the Czech Republic . During the period 2010–2021, the word ghetto was used officially by the Danish government to describe certain officially designated vulnerable social housing areas in the country. The designation was applied to areas based on the residents' income levels, employment status, education levels, criminal convictions and proportion of non-Western immigrants and their descendants. The term
3069-579: The Final Solution of Nazi Germany . The term ghetto acquired deep cultural meaning in the United States , especially in the context of segregation and civil rights . It has been widely used in the country since the 20th century to refer to poor neighborhoods of largely minority populations. It is also used in some European countries, such as Romania and Slovakia , to refer to poor neighborhoods largely inhabited by Romani people . The term slum
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3168-749: The London Borough of Barnet , and the West Indian community of Notting Hill ), but in each case these populations have been part of a broader multicultural population. In the late 19th and early 20th century, the East End of London was also noted for its Jewish population, but now has a significant British Bangladeshi populace. In Northern Ireland , towns and cities have long been segregated along ethnic, religious and political lines . The two main communities of Northern Ireland are: Ghettos emerged in Belfast during
3267-462: The Nazis established new ghettos in numerous cities of Eastern Europe as a form of concentration camp to confine Jews and Romani into limited areas. The Nazis most often referred to these areas in documents and signage at their entrances as "Jewish quarter." These Nazi camps sometimes coincided with traditional Jewish ghettos and Jewish quarters, but not always. On June 21, 1943, Heinrich Himmler issued
3366-468: The Red Summer because of the widespread racial outbreaks and white attacks on mainly African Americans. Two main factors ensured further separation between races and classes, and ultimately the development of contemporary ghettos: the relocation of industrial enterprises, and the movement of middle to upper class residents into suburban neighborhoods. Between 1967 and 1987, economic restructuring resulted in
3465-418: The intergenerational diffusion of status within families and neighborhoods, for instance, prove the rise in socioeconomic polarization between classes to be the creator of American ghetto; not racism . Furthermore, the culture of poverty theory, first developed by Oscar Lewis , states that a prolonged history of poverty can itself become a cultural obstacle to socioeconomic success, and in turn can continue
3564-540: The riots that accompanied the Irish War of Independence . For safety, people fled to areas where their community was the majority. Many more ghettos emerged after the 1969 riots and beginning of the " Troubles ." In August 1969 the British Army was deployed to restore order and separate the two sides. The government built barriers called " peace lines ." Many of the ghettos came under the control of paramilitaries such as
3663-631: The suburbs after World War II. These ethnic ghetto areas included the Lower East Side in Manhattan, New York , which later became notable as predominantly Jewish , and later still as Chinese and Latino. East Harlem was once predominantly Italian and in the 1950s became home to a large Puerto Rican community. Little Italys across the country were predominantly Italian ghettos. Many Polish immigrants settled in areas of other nationals, such as Pilsen of Chicago and Polish Hill of Pittsburgh . Since
3762-589: The "urban crisis" during the 1970s and 1980s, the transition stressed regional divisions according to differences in income and racial lines—white "donuts" around black holes. Hardly coincidental, the steady separation occurred during the period of civil rights laws, urban riots and Black Power . In addition, the International Encyclopedia of Social Sciences stresses the various challenges developed by this "urban crisis", including: [P]oorly underserviced infrastructures, inadequate housing to accommodate
3861-462: The (republican) Provisional Irish Republican Army and the (loyalist terrorist organisation ) Ulster Defence Association . One of the most notable ghettos was Free Derry . The development of ghettos in the United States is closely associated with different waves of immigration and internal urban migration. The Irish and German immigrants of the mid-19th century were the first ethnic groups to form ethnic enclaves in United States cities. This
3960-571: The 1970s, banlieues increasingly means, in French of France , low-income housing projects ( HLMs ) in which mainly foreign immigrants and French of foreign descent reside, often in perceived poverty traps . The existence of ethnic enclaves in the United Kingdom is controversial . Southall Broadway , a predominantly Asian area in Greater London , where less than 12 percent of the population
4059-541: The Christian community of Modica wreaked a brutal havoc on the Jewish dwellers of Cartellone, the so-called "Strage dell'Assunta" . This episode has been the first and most horrible antisemitic massacre to the detriment of the Sicilian Israelites. During the evening of Assumption's Day, with a single collective raptus numberless citizens (fomented by fanatic Catholic preachers) slaughtered about 360 innocents causing
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4158-507: The South; to seek out employment opportunities in industrial cities; and to pursue what was widely perceived to be a better quality of life in the North and West, such as New York City , Detroit , Cleveland , Chicago , Pittsburgh , Los Angeles , Oakland , Portland , and Seattle . African Americans found they had to struggle with white ethnic groups in Northern and Midwestern cities; many of them more recent European immigrants. Often they were restricted to areas of older and poor housing in
4257-504: The United States as the "age of extremes." This term argues that inequalities of wealth and power reinforce spatial separation; for example, the growth of gated communities can be interconnected with the continued "ghettoization" of the poor. Another characteristic to African-American or Black ghettos and spatial separation is the dependence on the state, and lack of communal autonomy ; Sharon Zukin refers to Brownsville, Brooklyn , as an example. This relationship between racial ghettos and
4356-486: The ability of black people to move from inner cities to the suburbs, even when they were economically able to afford it. In contrast to this, the same period in history marked a massive suburban expansion available primarily to whites of both wealthy and working-class backgrounds, facilitated through highway construction and the availability of federally subsidized home mortgages ( VA , FHA , Home Owners' Loan Corporation ). These made it easier for families to buy new houses in
4455-569: The amount of material being removed. These steps are done prior to any final machining. After grinding, any surfaces that require tight dimensional control are machined. Many castings are machined in CNC milling centers. The reason for this is that these processes have better dimensional capability and repeatability than many casting processes. However, it is not uncommon today for castings to be used without machining. A few foundries provide other services before shipping cast products to their customers. It
4554-418: The appointed areas starting age 1, lowering social welfare for residents, incentives for reducing unemployment, demolition and rebuilding of certain tenements, rights for landlords to refuse housing to convicts, etc. The policies have been criticized for undercutting 'equality before law' and for portraying immigrants, especially Muslim immigrants, in a bad light. The term "ghetto" was controversial during
4653-588: The black middle class. Two dominant theories arise pertaining to the production and development of U.S. ghettos: race-based and class-based; as well as an alternative theory put forward by Thomas Sowell . First are the race-based theorists, who argue the importance of race in ghettos. Their analysis consists of the dominant racial group in the U.S. ( White Anglo-Saxon Protestants ) and their use of certain racist tactics in order to maintain their hegemony over black people and lengthen their spatial separation. Race-based theorists offset other arguments that focus on
4752-436: The casting surface. Numerous materials may be used to clean cast surfaces, including steel, iron, other metal alloys, aluminium oxides, glass beads, walnut shells, baking powder, and many others. The blasting media is selected to develop the color and reflectance of the cast surface. Terms used to describe this process include cleaning, bead blasting, and sand blasting . Shot peening may be used to further work-harden and finish
4851-423: The casting. To remove any mold remnants, the surface is cleaned using a blasting process. This means a granular media will be propelled against the surface of the casting to mechanically knock away the adhering sand. The media may be blown with compressed air, or may be hurled using a shot wheel. The cleaning media strikes the casting surface at high velocity to dislodge the mold remnants (for example, sand, slag) from
4950-508: The city led to significant population loss in those neighborhoods and is associated with an increase in neighborhood racial segregation. Residential segregation was further perpetuated because whites were willing to pay more than black people to live in predominantly white areas. Some social scientists suggest that the historical processes of suburbanization and decentralization are instances of white privilege that have contributed to contemporary patterns of environmental racism . Following
5049-479: The city. Versions of such restricted areas have been found across the world, each with their own names, classifications, and groupings of people. The term was originally used for the Venetian Ghetto in Venice, Italy , as early as 1516, to describe the part of the city where Jewish people were restricted to live and thus segregated from other people. However, other early societies may have formed their own versions of
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#17328553708245148-417: The constitution of community-established public housing, anti-poverty organizations, and social service facilities—all, in their own way, depend on state resources. However, certain dependence contradicts society's desires to be autonomous actors in the market. Moreover, Zukin implies, "the less 'autonomous' the community—in its dependence on public schools, public housing and various subsidy programs—the greater
5247-433: The definition and/or terminology in 2013, 2018 and 2021. In 2018, the Danish government at the time, led by Prime Minister Lars Løkke Rasmussen , announced its intention to "end the existence of parallel societies and ghettos by 2030." A number of measures was introduced to solve the issue of integration , including policies like 25 hours of obligatory daycare or corresponding parent supervision per week for children in
5346-427: The demographics of American ghettos is the prevalence of poverty. Poverty constitutes the separation of ghettos from other, suburbanized or private neighborhoods. The high percentage of poverty partly justifies the difficulty of emigration , which tends to reproduce constraining social opportunities and inequalities in society. The term ghettos has been commonly used for some time, but ghettos were around long before
5445-459: The designated stratum of African-Americans in the labor force was placed even below the working class; low-skill urban jobs were now given to incoming immigrants from Mexico or the Caribbean . Additionally, Zukin notes, "Not only have social services been drastically reduced, punitive and other social controls over the poor have been increased," such as law enforcement and imprisonment. Described as
5544-457: The emergence of anti-discrimination policies in housing and labor sparked by the civil rights movement , members of the black middle class moved out of the ghetto. The Fair Housing Act was passed in 1968. This was the first federal law that outlawed discrimination in the sale and rental of housing on the basis of race, color, national origin, religion and later sex, familial status, and disability. The Office of Fair Housing and Equal Opportunity
5643-487: The entire casting manufacturing route. Casting process simulation was initially developed at universities starting from the early ' 70s , mainly in Europe and in the U.S. , and is regarded as the most important innovation in casting technology over the last 50 years. Since the late ' 80s , commercial programs (such as PoligonSoft, AutoCAST and Magma) are available which make it possible for foundries to gain new insight into what
5742-433: The facility. The process includes melting the charge, refining the melt, adjusting the melt chemistry and tapping into a transport vessel. Refining is done to remove harmful gases and elements from the molten metal to avoid casting defects. Material is added during the melting process to bring the final chemistry within a specific range specified by industry and/or internal standards. Certain fluxes may be used to separate
5841-401: The furnace must be designed for temperatures over 1,600 °C (2,910 °F). The fuel used to reach these high temperatures can be electricity (as employed in electric arc furnaces ) or coke . The majority of foundries specialize in a particular metal and have furnaces dedicated to these metals. For example, an iron foundry (for cast iron) may use a cupola , induction furnace, or EAF, while
5940-628: The generally lawless border regions of Britain to the American South, where they formed a redneck culture common to both black and white people in the antebellum South . Characteristics of this culture included lively music and dance, violence, unbridled emotions, flamboyant imagery, illegitimacy, religious oratory marked by strident rhetoric, and a lack of emphasis on education and intellectual interests. Because redneck culture proved counterproductive, "that culture long ago died out...among both white and black Southerners, while still surviving today in
6039-451: The inequity between their organizations and the state, and the less willing residents are to organize." This should not, however, undermine local development corporations or social service agencies helping these neighborhoods. The lack of autonomy and growing dependence on the state, especially in a neoliberal economy, remains a key indicator to the production as well as the prevalence of African-American or Black ghettos, particularly due to
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#17328553708246138-484: The influence of the economy on segregation. More contemporary research of race-based theorists is to frame a range of methods conducted by white Americans to "preserve race-based residential inequities" as a function of the dominantly white, state-run government. Involving uneven development, mortgage and business discrimination and disinvestment—U.S. ghettos then, as suggested by race-based theorists, are conserved by distinctly racial reasoning. The more dominant view, on
6237-543: The inner cities. African Americans were disproportionately affected and became either unemployed or underemployed, with little wage and reduced benefits. A concentration of African Americans predominated in some inner city neighborhoods. It is also significant to compare the demographic patterns between black people and European immigrants, according to the labor market . European immigrants and African Americans were both subject to an ethnic division of labor. Because of discrimination, African Americans were often restricted to
6336-532: The lack of opportunities to compete in the global market. The concept of the ghetto and underclass has faced criticism both theoretically and empirically. Research has shown significant differences in resources for neighborhoods with similar populations both across cities and over time. This includes differences in the resources of neighborhoods with predominantly low income or racial minority populations. The cause of these differences in resources across similar neighborhoods has more to do with dynamics outside of
6435-551: The late 20th century, Brighton Beach in Brooklyn has become the home of predominately Jewish Russian and Ukrainian immigrants, who left after the Soviet Union lifted some migration restrictions and later after its fall. A commonly used definition of a ghetto is a community distinguished by a homogeneous race or ethnicity . Additionally, a key feature that developed throughout the post-industrial era and continues to symbolize
6534-515: The later half of the twentieth century, "eventually expressing this distance by literally moving away." This is followed by the exodus of black working-class families. As a result, the ghetto becomes primarily occupied by what sociologists and journalists of the 1980s and 1990s frequently title the " underclass ." William Julius Wilson suggests this exodus worsened the isolation of the black underclass — not only were they socially and physically distanced from whites, they also became isolated from
6633-469: The least secure division of the labor market. David Ward refers to this stagnant position in African-American or Black ghettos as the 'elevator' model, which implies that each group of immigrants or migrants takes turns in the processes of social mobility and suburbanization; and several groups did not start on the ground floor. The inability of black people to move from the ground floor, as Ward suggests,
6732-535: The majority included many craftsmen, doctors and tradesmen. Judeca and Giudecca are the corrupt or jargonized medieval versions of the Latin female adjective Judaica , meaning Jewish or Judaean . The Jewess or The Jewry are other plausible meanings. It is not known why the Venetian island of Giudecca acquired that name, as there is no evidence of Jewish settlement there. Historical events : On 15 August 1474,
6831-476: The manufacturing recycling movement, melting and recasting millions of tons of scrap metal every year to create new durable goods. Moreover, many foundries use sand in their molding process. These foundries often use, recondition, and reuse sand, which is another form of recycling. In metalworking , casting involves pouring liquid metal into a mold , which contains a hollow cavity of the desired shape, and then allowing it to cool and solidify. The solidified part
6930-498: The metal from slag and/or dross and degassers are used to remove dissolved gas from metals that readily dissolve in gasses. During the tap, final chemistry adjustments are made. Several specialised furnaces are used to heat the metal. Furnaces are refractory-lined vessels that contain the material to be melted and provide the energy to melt it. Modern furnace types include electric arc furnaces (EAF), induction furnaces , cupolas , reverberatory , and crucible furnaces. Furnace choice
7029-411: The metal into a mold, and removing the mold material after the metal has solidified as it cools. The most common metals processed are aluminum and cast iron . However, other metals, such as bronze , brass , steel , magnesium , and zinc , are also used to produce castings in foundries. In this process, parts of desired shapes and sizes can be formed. Foundries are one of the largest contributors to
7128-430: The metal. An efficient way of removing hydrogen from the melt is to bubble a dry, insoluble gas through the melt by purging or agitation. When the bubbles go up in the melt, they catch the dissolved hydrogen and bring it to the surface. Chlorine, nitrogen, helium and argon are often used to degas non-ferrous metals. Carbon monoxide is typically used for iron and steel. There are various types of equipment that can measure
7227-476: The most common use of the term, refers to mortgage discrimination . Data on house prices and attitudes toward integration suggest that in the mid-twentieth century, segregation was a product of collective actions taken by non-black people to exclude black people from outside neighborhoods. The "Racial" Provisions of the FHA Underwriting Manual of 1936 included the following guidelines which exacerbated
7326-406: The neighborhood. To a large extent the problem with the ghetto and underclass concepts stem from the reliance on case studies (in particular case studies from Chicago), which limit social scientist understandings of socially disadvantaged neighborhoods. Foundry A foundry is a factory that produces metal castings . Metals are cast into shapes by melting them into a liquid, pouring
7425-581: The new cities where they settled. The social disruption and economic competition following World War I, as veterans returned to the US, resulted in an outbreak of racial violence of whites against blacks in many of these Northern cities, such as Chicago, Omaha; Washington, DC, and others. Southern industrial cities were also affected. Such racist attacks were extremely violent, in some cases they included burning or bombing homes of African Americans; many innocent blacks were killed. African-American leaders described 1919 as
7524-499: The only "'authentic' black culture and even glamorize it" while they "denounce any criticism of the ghetto lifestyle or any attempt to change it." Sowell asserts that white liberal Americans have perpetuated this "counterproductive and self-destructive lifestyle" among black Americans living in urban ghettos through "the welfare state, and look-the-other-way policing, and smiling at 'gangsta rap'." Contemporary African-American or Black ghettos are characterized by an overrepresentation of
7623-440: The other hand, is represented by class-based theorists. Such theories confirm class to be more important than race in the structuring of U.S. ghettos. Although racial concentration is a key signifier for ghettos, class-based theorists emphasize the role and impact of broader societal structures in the creation of African-American or Black ghettos. Dynamics of low-wage service and unemployment triggered from deindustrialization , and
7722-404: The period of its usage, inhabitants feeling stigmatized by the wording and researchers pointing out that the areas in question were typically inhabited by 20-40 different ethnic minorities, hence being diametrically opposed to the ethnic homogeneity of the original ghettos, so that multi-ethnic residential areas would be a more appropriate term. In June 2019 a new social democratic government
7821-401: The poorest and worst of the urban black ghettos", which Sowell described as being characterized by "brawling, braggadocio, self-indulgence, [and] disregard of the future", and where "belligerence is considered being manly and crudity is considered cool, while being civilized is regarded as 'acting white'." Sowell blames liberal Americans who since the 1960s have embraced black ghetto culture as
7920-489: The potential for human error and increase repeatability in the quality of grinding. Casting processes simulation uses numerical methods to calculate cast component quality considering mold filling, solidification and cooling, and provides a quantitative prediction of casting mechanical properties, thermal stresses and distortion. Simulation accurately describes a cast component's quality up-front before production starts. The casting rigging can be designed with respect to
8019-400: The presence of hydrogen. Alternatively, the presence of hydrogen can be measured by determining the density of a metal sample. In cases where porosity still remains present after the degassing process, porosity sealing can be accomplished through a process called metal impregnating . In the casting process, a pattern is made in the shape of the desired part. Simple designs can be made in
8118-439: The primary metal used to form a particular alloy . Alloying elements are either pure forms of an alloying element, like electrolytic nickel , or alloys of limited composition, such as ferroalloys or master alloys. External scrap is material from other forming processes such as punching , forging , or machining . Internal scrap consists of gates , risers , defective castings, and other extraneous metal oddments produced within
8217-413: The required component properties. This has benefits beyond a reduction in pre-production sampling, as the precise layout of the complete casting system also leads to energy , material, and tooling savings. The software supports the user in component design, the determination of melting practice and casting methoding through to pattern and mold making, heat treatment , and finishing. This saves costs along
8316-544: The rigidity of the labor market, competition and conflict, adding another dimension to the prevalence of poverty and social instability in African-American or Black ghettos. In the years following World War II, many white Americans began to move away from inner cities to newer suburban communities, a process known as white flight . White flight occurred, in part, as a response to black people moving into white urban neighborhoods. Discriminatory practices, especially those intended to "preserve" emerging white suburbs, restricted
8415-516: The same structure; words resembling ghetto in meaning appear in Hebrew , Yiddish , Italian , Germanic , Polish (since Poland's Warsaw had/has a sizable of Jewish minorities fleeing pogroms.), Corsican, Old French , and Latin . During the Holocaust , more than 1,000 Nazi ghettos were established to hold the Jewish populations of Europe , with the goal of exploiting and killing European Jews as part of
8514-433: The segregation issue: Recommended restrictions should include provision for: prohibition of the occupancy of properties except by the race for which they are intended ... Schools should be appropriate to the needs of the new community and they should not be attended in large numbers by inharmonious racial groups. This meant that ethnic minorities could secure mortgage loans only in certain areas, and it resulted in
8613-444: The sprue, runners, and gates can be removed by breaking them away from the casting with a sledge hammer or specially designed knockout machinery. Risers must usually be removed using a cutting method (see above) but some newer methods of riser removal use knockoff machinery with special designs incorporated into the riser neck geometry that allow the riser to break off at the right place. The gating system required to produce castings in
8712-483: The state is demonstrated through various push and pull features, implemented through government subsidized investments, which certainly assisted the movement of white Americans into the suburbs after World War II . Since the 1960s, after the de-constitution of the inner cities, African-American or Black ghettos have attempted to reorganize or reconstitute; in effect, they are increasingly regarded as public- and state-dependent communities. Brownsville, for instance, initiated
8811-415: The suburbs, but not to rent apartments in cities. The United States began restructuring its economy after World War II, fueled by new globalizing processes, and demonstrated through technological advances and improvements in efficiency. The structural shift of 1973, during the post-Fordist era, became a large component to the racial ghetto and its relationship with the labor market. Sharon Zukin declares
8910-408: The surface. The final step in the process of casting usually involves grinding, sanding, or machining the component in order to achieve the desired dimensional accuracies, physical shape, and surface finish. Removing the remaining gate material, called a gate stub, is usually done using a grinder or sander . These processes are used because their material removal rates are slow enough to control
9009-486: The surrounding authorities. A Yiddish term for a Jewish quarter or neighborhood is Di yidishe gas ( Yiddish : די ייִדישע גאַס ), or 'The Jewish street'. Many European and Middle Eastern cities once had a historical Jewish quarter. Jewish ghettos in Christian Europe existed because of majority discrimination against Jews on the basis of religion, language and dated views on race: They were considered outsiders. As
9108-457: The term was coined. Urban areas in the U.S. can often be classified as "black" or "white", with the inhabitants primarily belonging to a homogenous racial grouping. This classification can be traced back as early as the year 1880 as African Americans were living in their own neighborhoods. Sixty years after the American civil rights movement of the 1950s and 1960s, most of the United States remains
9207-482: The type of foundry, metal to be poured, quantity of parts to be produced, size of the casting, and complexity of the casting. These mold processes include: In a foundry, molten metal is poured into molds . Pouring can be accomplished with gravity, or it may be assisted with a vacuum or pressurized gas. Many modern foundries use robots or automatic pouring machines to pour molten metal. Traditionally, molds were poured by hand using ladles . The solidified metal component
9306-414: The type of metals that are to be melted. Furnaces must also be designed based on the fuel being used to produce the desired temperature. For low temperature melting point alloys, such as zinc or tin, melting furnaces may reach around 500 °C (932 °F). Electricity, propane, or natural gas are usually used to achieve these temperatures. For high melting point alloys such as steel or nickel-based alloys,
9405-457: The word is uncertain, as there is no agreement among etymologists about the origins of the Venetian language term as it pertains to a neighborhood. One theory of the word can be traced to a special use of the Venetian ghèto , meaning ' foundry ' (there was one near the site of that city's ghetto when it was founded in 1516). According to various other theories it comes from: Another possibility
9504-465: Was charged with administering and enforcing the law. Since housing discrimination became illegal, new housing opportunities were made available to the black community and many left the ghetto. Urban sociologists frequently title this historical event as "black middle class exodus", or black flight . Elijah Anderson describes a process by which members of the black middle class begin to distance themselves socially and culturally from ghetto residents during
9603-483: Was controversial during its period of use and was finally removed in 2021. In 2010, the Danish Ministry of Transport, Building and Housing introduced an official listing of vulnerable social housing districts where the inhabitants fulfilled certain criteria. The list has informally and at times formally been called Ghettolisten (the 'List of Ghettos'). Since 2010, the list has been updated annually, with changes in
9702-520: Was followed by large numbers of immigrants from Southern and Eastern Europe, including many Italians and Poles and Russians between 1880 and 1920. Jewish immigrants were part of the earliest German wave, as well as comprising numerous immigrants from Eastern Europe, the Russian Empire at the time. Most remained in their established immigrant communities, but by the second or third generation, many families were able to relocate to newer housing built in
9801-470: Was formed in Denmark, with Kaare Dybvad becoming housing minister. He stated that the new government would stop using the word "ghetto" for vulnerable housing areas, as it was both imprecise and derogatory. In a 2021 reform, the name was finally removed in legal texts by Parliament. Instead, a new category called "parallel societies" was instituted. In France , a banlieue ( French: [bɑ̃ljø] )
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