Search

Official sub-national GDP figures in South Africa are usually published with long delays or not at all, i.e. relevant, reliable, and real-time economic data on a provincial and local (municipal) level are often non-existent, causing a significant data asymmetry at the sub-national level. The search for an ‘optimal’ sub-national proxy for regional economic growth focuses on the possible use of regional business confidence. This article, therefore, investigates the use of regional business confidence indices (RBCI) as an early indicator or proxy of the regional economic growth rate (RGDP). To this end, the study employed panel cointegration methodology and techniques to interrogate the possible association between regional business confidence and regional economic growth, focusing on three specific regions of KwaZulu-Natal, South Africa. The results suggest that the utilisation of regional business confidence indicators indeed has merit. Constraints experienced in the study indicate the direction that further studies may follow, especially concerning the scope of the period and cross-sections. The research, therefore, addresses a fundamental gap in the data asymmetry in South Africa, while also setting a benchmark for other researchers to follow.

Following two initial campaigns [1], Stellarator Wendelstein 7-X (W7-X) has now completed the construction phase by installation of active cooling of all plasma facing components. The machine is presently commissioned for the next campaign (OP2) aiming at 1 GJ per pulse, e.g. 100 s at 10 MW, eventually aiming at 18 GJ, e.g. 1800 s at 10 MW. The key heating system is the Electron Cyclotron Resonance Heating (ECRH) system, consisting of 10 gyrotrons with power per gyrotron ranging from 0.6 MW up to 1.0 MW at 140 GHz. A phased upgrade of the installation is in progress with the addition of 2 gyrotrons and the development of 1.5 MW and 2.0 MW gyrotrons, such that at the end of the upgrade 4 gyrotrons will be available in each power class of 1.0, 1.5 and 2.0 MW [2]. The increased ECRH power, combined with O2 and X3 heating schemes at high densities, will lead to increased microwave stray radiation. This is non-absorbed microwave power that diffuses inside the vessel and is incident on all in-vessel components including vacuum windows and attached diagnostic systems. A fraction of the stray radiation is absorbed by resistive or dielectric losses of these components, leading to thermal loads that scale with stray radiation levels and pulse length. At W7-X a high power microwave stray radiation launch facility ’MISTRAL’ is available that is used to qualify invessel components for use at specified microwave surface power densities [Wm−2]. This paper reports on MISTRAL campaigns in 2020 2021 for testing of stray radiation loads during OP2 in W7-X, as well as on an EUROfusion program assessing stray radiation loads on ITER components. A dedicated, absolutely calibrated, caloric load was developed for the campaign to obtain measurement of stray radiation power levels as well as to conveniently expose samples. Amongst other we report on shielding concepts using metal enclosures combined with microwave absorbing coatings and dielectric heating of vacuum windows.

Despite Africa’s strong foreign direct investment (FDI) performance since 2000, the majority of FDI inflows have been directed to a few selected countries. As investors face many risks when investing in developing countries, it is argued that risk perception plays a vital role in the FDI inflows into Africa. This article focuses on the relationship between risk and FDI. A structural equation model is used to analyse this relationship with a dataset of ten risk categories and FDI data from 42 African countries. The study focuses on four sectors, namely metals, automotive, communications and real estate. Overall, results indicate that government effectiveness and legal and regulatory risks produce the biggest concern for investors. The conclusion is that each sector’s risk pattern regarding FDI differs. The most important empirical results indicated that African countries should focus more on government effectiveness, stability and transparency to attract the levels of FDI required to stimulate economic growth.

In a coincidence experiment, two excitation functions (0=60° and 90°) and four angular distributions of the differential cross section for the elastic scattering ofLi onLi were measured. The energy range for the excitation functions was from 2 to 10 MeV (CM), the angular distributions were taken at CM-energies of 4, 5, 6, 7.25 MeV. Optical model calculations were performed. It is shown that the outer portion of the potentials is most important for reproducing the experimental data. [ABSTRACT FROM AUTHOR]