Geochemistry and risk assessment of street dust in Luanda, Angola, a tropical urban environment

A total of 92 samples of street dust were collected in Luanda, Angola, were sieved below 100 μm, and analysed by ICP-MS for 35 elements after an aqua-regia digestion. The concentration and spatial heterogeneity of trace elements in the street dust of Luanda are generally lower than in most industrialized cities in the Northern hemisphere. These observations reveal a predominantly “natural” origin for the street dust in Luanda, which is also manifested in that some geochemical processes that occur in natural soils are preserved in street dust: the separation of uranium from thorium, and the retention of the former by carbonate materials, or the high correlation between arsenic and vanadium due to their common mode of adsorption on solid particles in the form of oxyanions. The only distinct anthropogenic fingerprint in the composition of Luanda's street dust is the association Pb–Cd–Sb–Cu (and to a lesser extent, Ba–Cr–Zn). The use of risk assessment strategies has proved helpful in identifying the routes of exposure to street dust and the trace elements therein of most concern in terms of potential adverse health effects. In Luanda the highest levels of risk seem to be associated (a) with the presence of As and Pb in the street dust and (b) with the route of ingestion of dust particles, for all the elements included in the study except Hg, for which inhalation of vapours presents a slightly higher risk than ingestion. However, given the large uncertainties associated with the estimates of toxicity values and exposure factors, and the absence of site-specific biometric factors, these results should be regarded as preliminary and further research should be undertaken before any definite conclusions regarding potential health effects are drawn.

The Universality of Civil War Definitions: A Study of How Regional Considerations Impact Civil War in Somalia, Colombia, and Angola

Civil war is a socially intimate phenomenon. The viability of the conflict hinges on recruitment for the cause, military strategy, community support, and a variety of other conditional factors. Despite this dependence on local society, many researchers approach civil war from a global perspective, attempting to discover universal truths about this kind of conflict. This capstone project focuses on restricting the operating parameters of civil war research projects to the span of a single continent, hoping to achieve deeper insight by focusing the research using a more culturally sensitive set of parameters. By using cultural data to guide civil war research, conflict indicators can tailor conflict prevention to escalating violent scenarios.

Angola's agricultural economy in brief /

Cover title.

Angola; repression and revolt in Portuguese Africa.

Mode of access: Internet.

An account of the discoveries of the Portuguese in the interior of Angola and Mozambique : From original manuscripts /

"Appendix on the trade of Lisbon, with the Portuguese settlements, in Africa, in the years 1803 and 1804": p. [145]-173.

Travels in the interior of Africa, from the Cape of Good Hope to Morocco from the years 1781 to 1797; through Caffraria, the kingdoms of Mataman, Angola, Massi, Monœnugi, Muschato [!] &c.

Translation of Landreise in das Innere von Afrika.

From experience to knowledge in ELT

From Experience to Knowledge in ELT investigates the developing discourses of English Language teachers in a variety of international contexts. By analysing how professional development takes place through participation in professional discourse, the chapters shed light on what teachers do and why they do it. - Better understand what they have already learned through their teaching - use that new understanding to develop their teaching - prepare to gain a recognised qualification (such as the Cambridge Teacher Knowledge Test) Using short extracts from published course books as examples, From Experience to Knowledge in ELT offers the teacher reliable procedures and alternatives, as well as ways of thinking about developing a personal teaching style.

Critical pegagogy in ELT: perspectives and praxis of western English teachers in Korean post-secondary education

Presently, there are numerous Native English Teacher (NETs) teaching in Korean post-secondary educational (PSE) institutions. The aim of this thesis is to explore the views held by NETs with regards to their self-perceived teaching perspectives while working in a Korean PSE setting. The thesis also aims to answer the assertion made in the literature that English as Foreign Language (EFL) teachers are "acritical and atheoretical". To this end, the thesis intends to identify the extent of the NETs’ preference for social reform as a teaching perspective, the NETs stated reasons for identifying with roles as social reformers, how these views are reflected in the NETs’ practice (praxis), what the barriers impeding the adoption and enactment of social reform are, and how the NETs’ perspectives relate to critical pedagogy. The results reveal that NETs in Korean PSE do not align themselves with social reform, yet categorizing NETS as "acritical and atheoretical" may be overly-simplistic. The results show that there are three kinds of obstacles that prevent NETs from engaging more with social reform and being less acritical and atheoretical: 1) NETs teaching in Korean EFL are conflicted and/or confused about their roles as English teachers; 2) there are significant cultural constraints to teaching in Korean EFL as a NET; 3) there are significant pedagogical constraints to teaching in Korean EFL as a NET.