The Macroeconomic Impact of Skilled Emigration from South Africa: A CGE Analysis

South Africa faces the dual problem of large inflows of illegal immigrants and outflows of skilled emigrants. This situation potentially has serious implications for the domestic labour market and economy as a whole. In this paper we measure the impact of skilled emigration and the subsequent loss in primary factor productivity on the South African economy using a dynamic computable general equilibrium (CGE) model. Results indicate that skilled emigration in the absence of any programmes to counter this flow of workers has a generally negative effect on the economy. Industries with the greatest exposure to the investment and export sectors as well as those with the highest concentration of skilled workers are shown to be most affected. We also use simple and intuitive back-of-the-envelope equations to enhance our understanding of the mechanisms driving the model’s macroeconomic results. These results justify the government’s current efforts to retain and attract skilled labour as part of the ASGISA framework.

High efficiency optical beamsplitter designed for operation in the infrared region

Beamsplitter system uses potassium bromide as substrate for operating in the spectral region between 5 and 30 microns and calcium fluoride for narrowband applications. It uses a 13-layer film which yields nearly equal broadband infrared reflectance and transmittance

Multilayer infrared beamsplitter film system

Multilayer infrared beamsplitter film system on a potassium bromide crystal substrate is operational over a wavelength range of 2.5 to 25 microns with nearly equal broadband reflectance and transmittance. It is useful in optical coating, vacuum deposition, radiometry, interferometry, and spectrometry

Quasi-2D dynamic jamming in cornstarch suspensions: visualization and force measurements

We report experiments investigating jamming fronts in a floating layer of cornstarch suspension. The suspension has a packing fraction close to jamming, which dynamically turns into a solid when impacted at a high speed. We show that the front propagates in both axial and transverse direction from the point of impact, with a constant ratio between the two directions of propagation of approximately 2. Inside the jammed solid, we observe an additional compression, which results from the increasing stress as the solid grows. During the initial growth of the jammed solid, we measure a force response that can be completely accounted for by added mass. Only once the jamming front reaches a boundary, the added mass cannot account for the measured force anymore. We do not, however, immediately see a strong force response as we would expect when compressing a jammed packing. Instead, we observe a delay in the force response on the pusher, which corresponds to the time it takes for the system to develop a close to uniform velocity gradient that spans the complete system.Comment: 7 pages, 7 figure

Magnetic relaxation in metallic films: Single and multilayer structures

The intrinsic magnetic relaxations in metallic films will be discussed. It will be shown that the intrinsic damping mechanism in metals is caused by incoherent scattering of itinerant electron-hole pair excitations by phonons and magnons. Berger [L. Berger, Phys. Rev. B 54, 9353 (1996)] showed that the interaction between spin waves and itinerant electrons in multilayers can lead to interface Gilbert damping. Ferromagnetic resonance (FMR) studies were carried out using magnetic single and double layer films. The FMR linewidth of the Fe films in the double layer structures was found to always be larger than the FMR linewidth measured for the single Fe films having the same thickness. The increase in the FMR linewidth scaled inversely with the film thickness, and was found to be linearly dependent on the microwave frequency. These results are in agreement with Berger's predictions. (C) 2002 American Institute of Physics

The Role of Temporary Help Employment in Low-wage Worker Advancement

We examine the effects of temporary help service employment on later earnings and employment for individuals participating in three federal programs providing supportive services to those facing employment difficulties. The programs include Temporary Assistance for Needy Families, whose participants are seriously disadvantaged; a job training program with a highly heterogeneous population of participants; and employment exchange services, whose participants consist of Unemployment Insurance claimants and individuals seeking assistant in obtaining employment. We undertake our analyses for two periods: the late 1990s, a time of very strong economic growth, and shortly after 2000, a time of relative stagnation. Our results suggest that temporary help service firms may facilitate quicker access to jobs for those seeking employment assistance and impart substantial benefits as transitional employment, especially for individuals whose alternatives are severely limited. Those who do not move out of temporary help jobs, however, face substantially poorer prospects, and we observe that nonwhites are more likely than whites to remain in THS positions in the two years following program participation. Our results are robust to program and time period.

The Role of Temporary Help Employment in Low-wage Worker Advancement

We examine the effects of temporary help service employment on later earnings and employment for individuals participating in three federal programs providing supportive services to those facing employment difficulties. The programs include Temporary Assistance for Needy Families, whose participants are seriously disadvantaged; a job training program with a highly heterogeneous population of participants; and employment exchange services, whose participants consist of Unemployment Insurance claimants and individuals seeking assistant in obtaining employment. We undertake our analyses for two periods: the late 1990s, a time of very strong economic growth, and shortly after 2000, a time of relative stagnation. Our results suggest that temporary help service firms may facilitate quicker access to jobs for those seeking employment assistance and impart substantial benefits as transitional employment, especially for individuals whose alternatives are severely limited. Those who do not move out of temporary help jobs, however, face substantially poorer prospects, and we observe that nonwhites are more likely than whites to remain in THS positions in the two years following program participation. Our results are robust to program and time period.temporary help, mediated employment, program evaluation