Throughout its history, the Sahara has been a stage for human evolution and cultural development, with human habitation, movement and life ways shaped by a dynamic environment of successive phases of ...relative humidity and aridity driven by wider global climatic changes. Recently, a large body of archaeological and environmental data has been generated by work carried out in the central and eastern Sahara, which has enabled researchers to construct a range of individual Saharan narratives involving linked environmental and cultural changes (Cremaschi and di Lernia 1998; di Lernia 1999a; di Lernia and Manzi 2002; Kröpelin 2007; Kuper and Kröpelin 2006;
Typology of Stone Features Nick Brooks; Salvatore Garfi; Yves Gauthier
The Archaeology of Western Sahara,
08/2018
Book Chapter
As in many Saharan regions, built stone cairns and other stone structures associated with prehistoric human occupation are a ubiquitous feature of the landscape in Western Sahara. However, little has ...been written about these aspects of Western Sahara’s archaeological record, with the majority of the published literature on the territory’s archaeology focusing on rock art and other aspects of prehistoric material culture, namely chipped stone and (to a much lesser extent) ceramics (e.g. Almagro Basch 1945–1946; Almagro Basch 1946; Soler Masferrer et al. 1999; Soler i Subils et al. 2001a, 2006). For example, Almagro Basch (1946) devotes just 18
Most investors are accustomed to reading about the gold and oil markets, but few have considered the benefits of diversifying their portfolios using agricultural commodities. A quick overview of ...recent performance of agricultural commodities versus the world's major equity benchmarks indicates this is a sector that should not be ignored. At the broadest level, commodities typically have a low correlation with equities and bonds. Therefore, if commodities are added to a portfolio of equities and bonds, the portfolio will generally have a better risk-reward profile than a portfolio made up of only equities and bonds. Agriculture is one of the least understood of the commodity sectors, but potentially provides some of the best diversification benefits and long-term returns.
Most investors are accustomed to reading about the gold and oil markets, but few have considered the benefits of diversifying their portfolios using agricultural commodities. A quick overview of ...recent performance of agricultural commodities versus the world's major equity benchmarks indicates this is a sector that should not be ignored. At the broadest level, commodities typically have a low correlation with equities and bonds. Therefore, if commodities are added to a portfolio of equities and bonds, the portfolio will generally have a better risk- reward profile than a portfolio made up of only equities and bonds. With the introduction of exchange-traded commodities, both institutional and private investors are now able to invest directly in agricultural commodities.
It's not quite that simple. Charities must also be aware of "connected persons" to any donor. These include - but are not limited to - spouses, relatives, spouses of relatives and people working for ...companies controlled by the person or anyone connected to them. It is estimated that each substantial donor may have several hundred connected persons.
For the past decade, droplet interface bilayers (DIBs) have had an increased prevalence in biomolecular and biophysical literature. However, much of the underlying physics of these platforms are ...poorly characterized. To further the understanding of these structures, a study of lipid membrane tension on DIB membranes is measured by analysing the equilibrium shape of asymmetric DIBs. To this end, the morphology of DIBs is explored for the first time using confocal laser scanning fluorescence microscopy (CLSM). The experimental results confirm that, in accordance with theory, the bilayer interface of a volume asymmetric DIB is curved toward the smaller droplet and a lipid asymmetric DIB is curved toward the droplet with the higher monolayer surface tension. Moreover, the DIB shape can be exploited to measure complex bilayer surface energies. In this study, the bilayer surface energy of DIBs composed of lipid mixtures of phosphatidylgylcerol (PG) and phosphatidylcholine (PC) are shown to increase linearly with PG concentrations up to 25%. The assumption that DIB bilayer area can be geometrically approximated as a spherical cap base is also tested, and it is discovered that the bilayer curvature is negligible for most practical symmetric or asymmetric DIB systems with respect to bilayer area.
