[1] The Context Camera (CTX) on the Mars Reconnaissance Orbiter (MRO) is a Facility Instrument (i.e., government-furnished equipment operated by a science team not responsible for design and fabrication) designed, built, and operated by Malin Space Science Systems and the MRO Mars Color Imager team (MARCI). CTX will (1) provide context images for data acquired by other MRO instruments, (2) observe features of interest to NASA's Mars Exploration Program (e.g., candidate landing sites), and (3) conduct a scientific investigation, led by the MARCI team, of geologic, geomorphic, and meteorological processes on Mars. CTX consists of a digital electronics assembly; a 350 mm f/3.25 Schmidt-type telescope of catadioptric optical design with a 5.7°field of view, providing a $30-km-wide swath from $290 km altitude; and a 5000-element CCD with a band pass of 500-700 nm and 7 mm pixels, giving $6 m/pixel spatial resolution from MRO's nearly circular, nearly polar mapping orbit. Raw data are transferred to the MRO spacecraft flight computer for processing (e.g., data compression) before transmission to Earth. The ground data system and operations are based on 9 years of Mars Global Surveyor Mars Orbiter Camera on-orbit experience. CTX has been allocated 12% of the total MRO data return, or about !3 terabits for the nominal mission. This data volume would cover $9% of Mars at 6 m/pixel, but overlapping images (for stereo, mosaics, and observation of changes and meteorological events) will reduce this area. CTX acquired its first (instrument checkout) images of Mars on 24 March 2006.

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This paper analyses the impact of the University of Cape Town's first-year microeconomics academic development course on performance in examinations. The paper makes two advances to existing empirical literature in this area. Firstly, we compare performance with a control group drawn from the mainstream economic course. Secondly, we evaluate performance in subsequent courses in first-year macroeconomics and second-year microeconomics. The results suggest that the academic development course has a major impact on students' performance in the structured/essay questions, relative to the control group, in first- and second-year microeconomics, and for the multiple-choice questions in first-year macroeconomics. Copyright (c) 2007 The Authors. Journal compilation (c) 2007 Economic Society of South Africa.

This article uses a Chenery-type decomposition and econometric estimation to evaluate the impact of Chinese trade on production and employment in South African manufacturing from 1992 to 2010. The results suggest that increased import penetration from China caused South African manufacturing output to be 5 per cent lower in 2010 than it otherwise would have been. The estimated reduction of total employment in manufacturing as a result of trade with China is larger -in 2010 about 8 per cent -because the declines in output were concentrated on labour-intensive industries and because the increase in imports raised labour productivity within industries.

This article uses firm-level data from company income tax and customs declarations from South Africa to analyse the complementary relationship between direct access to imported intermediate inputs and firm exports in the manufacturing industry. There are two main findings. The first is on firm heterogeneity, showing that firms that import and export consistently demonstrate premiums in terms of productivity, employment, wages and capital intensity in production compared to firms that do not trade, or only export or import. The second supports the hypothesis that importing raises exports, especially if inputs are sourced from advanced economies. JEL Classification: F14, D24, F61

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This paper uses new tariff data to re-evaluate the extent to which South Africa has liberalised its trade from the late 1980s. The paper finds that significant progress has been made in simplifying South Africa's tariff structure and reducing tariff protection, but further progress can be made in removing tariff peaks, reducing tariff dispersion, and lowering the anti-export bias arising from protection. Further, although protection has fallen, the decline has been no faster than in other lower-middle-income economies. The paper also finds that estimates of the level of nominal and effective protection, and their rate of change, are sensitive to the choice of tariff measure (collection duties or scheduled tariff rates) and Input-Output or Supply-Use table, but that the sectoral structure of protection is largely unaffected.

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