Some scholars have stated that there is no agreed upon definition of homelessness in Egypt due to the difficulties government would face if an official definition were accepted.According to UNICEF, there are 1 million children living on the streets in Egypt. Other researchers estimate the number to be some 3 million. Homelessness NGOs assisting street children include those such as Hope Village Society, and NAFAS. Other NGOs, such as Plan International Egypt, work to reintegrate street children back into their families. South Africa
Homelessness in South Africa dates back to the apartheid period. Increasing unemployment, lack of affordable housing, social disintegration, and social and economic policies have all been identified as contributing factors to the issue. Some scholars argue that solutions to homelessness in South Africa lie more within the private sphere than in the legal and political spheres.There is no national census on homeless people in South Africa, researchers instead rely on individual studies of homeless persons in particular cities. The South African homeless population has been estimated at 200,000 people from a diverse range of backgrounds. Most South African municipalities primarily view homelessness as a social dependency issue, responding with social interventions. One study found that three out of four South African metropolitan municipalities viewed homelessness primarily as a social dependency issue, responding with social interventions. At the same time, homeless South Africans indicated that the most important thing the municipality could assist them with was employment and well-located affordable housing.
The molar ratio of the FeCl3:FeCl2 should be about 2:1. Heat the mix to 70 °C, then raise the speed of stirring to about 7500 rpm and quickly add a solution of NH4OH (10 volume %). A dark precipitate  of nanoparticles of magnetite forms immediately.In both methods, the precipitation reaction relies on rapid transformation of acidic iron ions into the spinel iron oxide structure at pH 10 or higher. Controlling the formation of magnetite nanoparticles presents challenges: the reactions and phase transformations necessary for the creation of the magnetite spinel structure are complex. The subject is of practical importance because magnetite particles are of interest in bioscience applications such as magnetic resonance imaging (MRI), in which iron oxide magnetite nanoparticles potentially present a non-toxic alternative to the gadolinium-based contrast agents currently in use. However, difficulties in controlling the formation of the particles, still frustrate the preparation of superparamagnetic magnetite particles, that is to say: magnetite nanoparticles with a coercivity of 0 A/m, meaning that they completely lose their permanent magnetisation in the absence of an external magnetic field. The smallest values currently reported for nanosized magnetite particles is Hc = 8.5 A m−1, whereas the largest reported magnetization value is 87 Am2 kg−1 for synthetic magnetite.Pigment quality Fe3O4, so called synthetic magnetite, can be prepared using processes that use industrial wastes, scrap iron or solutions containing iron salts (e.g.