Current and future small satellite projects in South Africa

Steyn, Willem J.; Zyl, Robert Van; Inggs, Michael; Cilliers, Pierre J.

doi:10.1109/igarss.2013.6723018

Cited by 7 publications

(5 citation statements)

References 3 publications

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“…This can also be seen to be connected to high levels of gender-based violence (GBV) inflicted against women, generally, in South Africa tied to the entrenchment of deeply regressive and repressive patriarchal attitudes (Gqola, 2015). Furthermore, the legacy of the spatial segregation of apartheid continues to influence how sexualities are orientated in different spaces (Graziano, 2004;Steyn & Van Zyl, 2009). This is particularly true for queer women whose identities are obviously shaped by multiple intersectional factors (i.e.…”

Section: Public Spaces For Queer Womenmentioning

confidence: 99%

Navigating Urban Spaces as Queer Women in South Africa

Khuzwayo

2023

Urban Forum

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Occupying urban spaces for queer women, often shaped by implicit and explicit forms of regressive heteropatriarchy, has been understood as a challenge for queer women. As a result, queer women struggle to inhabit, live and feel safe in urban spaces. However, further scholarship is needed to consider how queer women may also find strategies to overcome such challenges. Such work can then add productively to, and right an imbalance within, existing scholarship on sexuality and urban space by exploring, acknowledging and giving voice to the lived experiences of queer women especially in urban Africa. Drawing on a PhD study that deployed in-depth interviews with 23 queer women, this intervention looks specifically at how black queer women have found creative ways to create communities with each other in challenging contexts, in the city of Johannesburg. This intervention shows how black queer women resist various forms of oppression by creating safe spaces for themselves (and others) within the city. An appreciation of these strategies by black queer women can then help further discussions as to how we come to understand how queer women occupy and make urban spaces their own through socialisation and support in ways that may also have applicability across the wider continent.

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Section: Public Spaces For Queer Womenmentioning

confidence: 99%

Navigating Urban Spaces as Queer Women in South Africa

Khuzwayo

2023

Urban Forum

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“…To be compliant with this internal communication/control strategy, all proposed EPS architectures have their own microcontroller (MSP430F6659). The MSP430 was chosen because of its low energy consumption and because it has already been successfully qualified in space by other nanosatellites' missions (i.e., Skycube, 35,36 ZaCUBE-1, 37,38 and Delfi-n3Xt 39,40 ). This microcontroller may actuate on some satellite DC-DC converters in order to enable/disable them.…”

Section: Case Study: the Floripasat-1 Eps Overviewmentioning

confidence: 99%

Nanosatellite electrical power system architectures: Models, simulations, and tests

Slongo

Martinez

Eiterer

et al. 2020

Circuit Theory & Apps

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KESSLER SLONGO ET AL. power point tracking (MPPT) techniques, high-efficiency solar cells, and energy-aware scheduling algorithms are some of the hot topics under research nowadays. Due to size restrictions and aiming low complexity in design, many nanosatellite designers adopt the direct energy transfer (DET) architecture. KySat-2 is an example of a successfully accomplished mission, based on this EPS topology. Designed by Morehead State University Space Science and Engineering group, KySat-2 EPS was powered by a set of gold-plated deployable solar panels with 26% of efficiency. It provided four high-power regulated rails (two 3.3 V and two 5 V) and a low-noise, low power 3.3V rail for noise-sensitive devices. The energy storage system was made of three 18650 lithium-ion cells connected in series, and the high-power rails reached efficiencies approaching 90%. 12,21 Aiming minimum space occupation and low power consumption, the EPS proposed for the AraMiS project has a boost regulator operating the solar panels close to their MPP. 16 In order to reduce the number of components, the designers opted by the constant voltage MPPT algorithm, using only analog devices. The EPS steps up solar panels voltage from 4.4 V to the distribution bus voltage level (14 ± 2 V). It provides power buses with 3.3 and 5 V voltage levels. The EPS efficiency analysis is demonstrated, calculating the main components power losses. Although this is a very detailed and well-described work, it does not compare the proposed solution with other EPS architectures. A 3U EPS efficiency analysis is presented by Gonzalez-Llorente et al. 22 The subsystem is based on a buck converter that steps down the solar panels voltage (15 or 7.5 V) to the litChium-ion battery range of 3.3 or 6.6 V. The authors define an optimum operation point for the DC-DC converter in order to achieve its maximum efficiency. The operation point is defined by the converter input voltage, output voltage, and output power. Therefore, the discussion is based on different solar cells connections configurations, and battery cells arrangement, that result in the most efficient EPS configuration. Different scenarios have been analyzed to achieve 98% of peak efficiency on the best configuration: input voltage of 7.4 V, output voltage of 3.3 V, and output current varying from 0.1 mA to 2.1 A. Only the buck converter topology is discussed in this paper, and it does not consider any MPPT technique. An interesting solution adopted for the ERPSAT-1 picosatellite uses fuzzy logic to obtain energy harvesting maximization. 23 The developed subsystem has three main blocks, which are the fuzzy maximum power point tracker, the power conditioner, and the hierarchical fuzzy subsystem controller. The fuzzy logic algorithm has been implemented in a dedicated microcontroller that controls a boost converter. Simulations have been performed to demonstrate the better efficiency of the proposed method when compared to the Perturb and Observe MPPT algorithm. Although a comparison is provided in this work,...

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“…There have been various attempts to align sexuality and studies related to disability (Garland-Thomson 2002). Sexual and disability identities and challenges have been argued to possess strikingly similar traits, especially in terms of controversial theories of supremacy (Steyn & Van Zyl 2009) for the former and the theory of able-ism and suppression of people with disabilities (Campbell 2013) for the latter. Some of Campbell’s (2013) gender and disability similarity categorisations are provided in Table 1:…”

Section: Literature Reviewmentioning

confidence: 99%

Even we are important: Sexuality and the degenderisation of people with disabilities in the linguistic landscapes of two South African universities in the Western Cape province

2019

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BackgroundThis study focuses on the positioning of gender, sexual orientation and people with disabilities in the linguistic landscapes of two selected South African universities, which are located in the Western Cape province.ObjectivesThis study aims to answer the question: How are power relations depicted through linguistic landscaping in the universities?MethodsGiven that there is minimal empirical data in this field, the researcher approached this question by exploring the way in which sexual orientation and people with disabilities are perceived, via the modal resources used in the categorisation of toilet users at the institutions. Specifically, toilet signage was observed as there were only a few other signage or forms of support (such as ramps and lifts – some of which may seem disability-unfriendly in terms of space) and acknowledgement in other places at the institutions for people with disabilities. Data (signs, images, texts, billboards and posters) were collected by means of photography. The interpretive paradigm was used to determine the choice of methodology: critical discourse analysis and multimodality. These were also used to thematically analyse the collected data.ResultsFindings revealed that sexuality, as well as subtle inequality, unfortunately remain unravelled areas in South Africa’s higher institutions of learning. In addition, the degenderisation of people with disabilities appears to be prevalent at the institutions, although this may not necessarily be reflective of practices at all higher education institutions in South Africa.ConclusionNonetheless, the examined results are stimulating indicators of hegemonic and preferred practices in public places. They also depict the obtainable dissimilar scales and imbalances in society, which are not addressed may impede other authentic and ongoing measures of social integration and advancement.

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Current and future small satellite projects in South Africa

Cited by 7 publications

References 3 publications

Navigating Urban Spaces as Queer Women in South Africa

Navigating Urban Spaces as Queer Women in South Africa

Nanosatellite electrical power system architectures: Models, simulations, and tests

Even we are important: Sexuality and the degenderisation of people with disabilities in the linguistic landscapes of two South African universities in the Western Cape province

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