The article discusses the results of field research conducted in Tanzania from August 24 to September 14, 2018, which focused on the historical memory of the Arab slave trade in East Africa and the Indian Ocean in the 19th century, as well as its influence on the interethnic relations in the country today. Structured and nonstructured interviews (mostly in-depth) were conducted in Dar es Salaam, Bagamoyo and Zanzibar. In general, opinions were almost equally divided: half of the respondents were convinced that the relations were good overall, while the other half believed that there are some tensions. Since both positions are well-argued and substantiated, it is possible to trace a number of patterns in the people’s perception. The history of the Arab slave trade lies between family trauma on the one hand, and tolerance, non-discrimination imposed by the state, on the other. Two ways of reproducing the historical memory largely oppose each other: the school system places the blame on Europeans, promoting peaceful interethnic relations, presenting the slave trade as an essential part of colonialism, and subsequently emphasizing the story of overcoming the colonial past; meanwhile, the oral tradition censors nothing and tells the history of the ancestors’ suffering in its entirety. Thus, bearers of the oral tradition with a low level of education turn to be the most vulnerable category; they become the least tolerant to the Arab-Tanzanian part of the country’s population.
The article is devoted to mutual help groups in Dar es Salaam, Tanzania, as an input to the country's successful nation-building process. It summarizes the results of field researches conducted by Oxana V. Ivanchenko in 2011, 2013, and 2015. The research targeted the practices of mutual help and self-organization among citizens of one of the most rapidly growing mega-cities in Africa, both its second-and third-generation old-timers and newcomers, usually the poorest Tanzanian villagers who rush to the big city in search for a better life. The methods of research include participant observation and interview, both formal and informal, with the inhabitants of uswahilini, traditional African neighborhoods, most commonly bearing the status of informal settlements. The research is focused on various forms of mutual help groups (kufa na kuzikana, mchezo/upatu, and vikoba), which nowadays tend to transform and carry out same functions of microcrediting, money-saving, loan-giving, providing the insurance in case of emergency (death, illness), and insuring socialization and strengthening of friendly relations in general. Over the course of data analysis, the authors come to a conclusion that the Tanzanians, who moved to the city, recreate the communal way of life of rural areas though in adapted forms: neighbors and colleagues become their new environment that provides social guarantees and help in difficult situation instead of relatives, and the leaders of mutual help groups help Ivanchenko and Banshchikova / Urbanization and Mutual Help Groups 35 resolve conflicts instead of the police. Strong pre-state traditions of community life and self-organization, characteristic of rural Tanzania, nowadays help urban Tanzania to grow up. And, what is even more important is that if earlier these traditions used to function only among same-tribe or same-region Tanzanians and would remain on the ethnic level, later in big cities they would flourish on inter-ethnic and supra-ethnic levels, because the need in mutual help did not disappear, while same-tribe friends and relatives were far away. Thus, it is clear that under peaceful circumstances urbanization and mutual help practices contribute to the nation-building process: people move from village to city and from traditional social bonds (on the level of tribe, region of provenance) to chosen social bonds (on nation-level, because all other ones are already overcome or non-existent).
The article uses the software complex Lira for the calculation of wooden sleepers, in which the finite element method in the form of displacements is used. FEM provides for making a system of equations that is solved by considering each individual finite element, which is very easy to implement and thus is an important advantage of the method. The purpose of its use is to calculate the wooden sleepers for strength and to determine its bearing capacity. The following types of finite elements were chosen to simulate the upper track structure in the subway tunnel: universal rod-type spatial finite element (type 10) and universal finite element of spatial problem of the elasticity theory (type 31). To design a spatial model, a section of the rail with seven sleepers in the subway tunnel was simulated and loaded with one axle of the car, since the influence of the adjoining sleepers on the estimated sleeper is negligible. They were divided into eight-node tetragonal parallelepiped-shaped finite elements. In order to simulate a sleeper encased in track concrete, a movement restriction was introduced at its points of contact with track concrete. The loads are applied to the rail above the middle sleeper symmetrically relative to its middle and are assumed as concentrated forces on each track line. The part of the sleeper above the culvert is not supported by track concrete and can move freely in all directions. To obtain the values of stresses, the maximum-stress theory of strength is used.
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