scholarly journals First ground-based observations of sprites over southern Africa

2018 ◽  
Vol 114 (9/10) ◽  
Author(s):  
Stanislaus Nnadih ◽  
Mike Kosch ◽  
Peter Martinez ◽  
Jozsef Bor
Keyword(s):  
South Africa ◽  
Southern Africa ◽  
Dielectric Breakdown ◽  
Electrical Discharges ◽  
Lightning Strikes ◽  
The World ◽  
Lightning Discharges ◽  
Northern Cape ◽  
Cloud To Ground Lightning ◽  
Peak Value

Sprites are the optical signatures of electrical discharges in the mesosphere triggered by large lightning strikes associated with thunderstorms. Since their discovery in the late 1980s, sprites have been observed extensively around the world, although very few observations of sprites from Africa have been documented in the literature. In this paper, we report the first ground-based recorded observations of sprites from South Africa. In 2 out of the 22 nights of observations (11 January and 2 February 2016), about 100 sprite elements were recorded from Sutherland in the Northern Cape, comprising different morphologies (carrot (55%), carrot/column (11%), unclassified (21%), column (13%)). The sprites were triggered by positive cloud-to-ground lightning strikes, which had an average peak value of ~74 kA and were observed at distances from ~400 km to 800 km. The estimated charge moment change of the lightning discharges associated with these events was in agreement with the threshold for dielectric breakdown of the mesosphere and correlates well with the observed sprite brightness.

scholarly journals on the prevention of lighting

1969 ◽  
Vol 50 (7) ◽  
pp. 514-521 ◽  
Author(s):  
C. D. Stow
Keyword(s):  
United States ◽  
Forest Fires ◽  
Western United States ◽  
Agricultural Crops ◽  
Loss Of Life ◽  
The World ◽  
Lightning Discharges ◽  
Cloud To Ground Lightning ◽  
Recreational Resources

The destructive nature of cloud-to-ground lightning strokes is well known. Loss of life and damage to buildings and other man-made structures may to a large extent be prevented by the judicial use of lightning conductors and screens but no comparable protection may be offered to expanses of agricultural crops or forests. According to Fuquay (1967) lightning is the greatest single cause of forest fires in the western United States: during the period 1946–1962, 140,000 such fires occurred causing severe losses of timber, wildlife, watershed, and recreational resources. Comparable losses occur regularly in other parts of the world. The only solution is the suppression or modification of cloud-to-ground lightning discharges. Methods of suppression are described, some of which may turn out to be practical ways of achieving this aim.

The genus Waltheria in southern Africa

Bothalia ◽  
1981 ◽  
Vol 13 (3/4) ◽  
pp. 275-276 ◽  
Author(s):  
I. C. Verdoorn
Keyword(s):  
West Africa ◽  
Southern Africa ◽  
Distinct Species ◽  
Wide Distribution ◽  
Herbarium Specimens ◽  
South West ◽  
The World ◽  
Northern Cape ◽  
South West Africa ◽  
The Tropics

Waltheria indica L., the only species of Waltheria represented in southern Africa, is revised. This species, which occurs throughout the tropics and substropics of the world, is found abundantly in the northern Cape, Swaziland, northern Natal, Transvaal and northwards through South West Africa/Namibia and Botswana. Thoughout its wide distribution the species is uniform. A scrutiny o f herbarium specimens revealed that what appeared as a distinct species or subspecies was without doubt an abnormality, probably caused by insect injury.

Namibia’s Foreign Policy and Its Impact on Peace and Security in the Southern Africa Region: A Framework of Liberalism as a Theory of International Relations Studies

2020 ◽  
Vol 76 (4) ◽  
pp. 569-586
Author(s):  
Peya Mushelenga
Keyword(s):  
South Africa ◽  
Foreign Policy ◽  
International Relations ◽  
Southern Africa ◽  
Democratic Republic ◽  
Democratic Republic Of Congo ◽  
Main Question ◽  
International Peace ◽  
The World ◽  
Peace And Security

This article discusses aspects of Namibia’s foreign policy principles and how they impact on the values of democracy, and issue of peace and security in the region. The article will focus on the attainment of peace in Angola, democratisation of South Africa, and security situations in the Democratic Republic of Congo (DRC), Madagascar and Lesotho. The main question of this article is: To what extent has Namibia realised the objectives encapsulated in her foreign policy principles of striving for international peace and security and promote the values of democracy in the Southern African Development Community (SADC) region? The assumption is that though relatively a newly established state, Namibia has made her contribution towards democracy, peace and security in the Southern Africa region and the world at large.

Brief Historical Review of Membrane Development and Membrane Applications in Wastewater Treatment in Southern Africa

1992 ◽  
Vol 25 (10) ◽  
pp. 1-4 ◽  
Author(s):  
G. R. Botha ◽  
R. D. Sanderson ◽  
C. A. Buckley
Keyword(s):  
South Africa ◽  
Southern Africa ◽  
Mining Industry ◽  
Historical Review ◽  
Mine Waters ◽  
Considerable Potential ◽  
South Africans ◽  
Charged Membrane ◽  
The World ◽  
Membrane Development

Away back in 1953 few people in the world, let alone South Africa, knew or had heard about membrane desalination, but there was an increasing awareness that electrodialysis had considerable potential for the desalination of brackish water. In South Africa the development of the new gold fields in the northern Orange Free State and the problems posed by the presence of excessive volumes of very saline mine waters stimulated interest in desalination and the CSIR* in collaboration with the mining industry became involved in the development of the electrodialysis process. By 1959 the largest brackish desalination plant in the world had been built and commissioned. South Africans were thus in the forefront of this technology, even to the extent of making the required membranes locally. Our historical review of membrane development and the applications of membrane technology in Southern Africa encompasses both pressure- and voltage-driven processes. Examples of the pressure processes are microfiltration, ultrafiltration and charged membrane ultrafiltration or nanofiltration, and finally reverse osmosis with fixed and dynamically formed membranes. The voltage-drive processes considered are electrodialysis and electrodialysis reversal.

Economic Aspects of Lesotho's Relations with South Africa

1988 ◽  
Vol 26 (1) ◽  
pp. 71-89 ◽  
Author(s):  
James H. Cobbe
Keyword(s):  
South Africa ◽  
Sea Level ◽  
Southern Africa ◽  
Economic Activity ◽  
Labour Force ◽  
Economic Aspects ◽  
Total Income ◽  
Domestic Output ◽  
The World ◽  
The Republic

Lesotho has long had the distinction of being one of the more anomalous states not only in Southern Africa, but in the world. It is entirely surrounded by another country, the Republic of South Africa. It is ethnically and linguistically very homogeneous. It is a monarchy. Physically, the lowest point in Lesotho is higher, in vertical distance above sea level, that that in any other country. Its economy is marked by some extraordinary paradoxes, such as agriculture being the main economic activity of the bulk of the labour force albeit the origin of a small fraction of total income, imports enomously exceeding exports and being larger than domestic output, and fewer citizens working for cash inside the country than outside.

Revision and molecular phylogeny of the spider genus Micaria Westring, 1851 (Araneae: Gnaphosidae) in the Afrotropical Region

Zootaxa ◽  
2021 ◽  
Vol 4940 (1) ◽  
pp. 1-82
Author(s):  
RUAN BOOYSEN ◽  
CHARLES R. HADDAD
Keyword(s):  
South Africa ◽  
Bayesian Inference ◽  
Maximum Likelihood ◽  
Cote D'ivoire ◽  
Côte D’Ivoire ◽  
Fresh Material ◽  
Afrotropical Region ◽  
Coi Barcoding ◽  
The World ◽  
Northern Cape

The genus Micaria Westring, 1851 (Araneae, Gnaphosidae) is a group of small (1.85–5 mm) ant-like spiders that can be distinguished from other gnaphosids by their piriform gland spigots that are similar in size to the major ampullate gland spigots. According to the World Spider Catalog, there are 105 species of Micaria in the world, of which only three species are known from the African part of the Afrotropical Region, namely M. chrysis (Simon, 1910), M. tersissima Simon, 1910 and M. beaufortia (Tucker, 1923). The objectives of this study were to revise Micaria in the Afrotropical Region, providing new and updated records for each of the species, evaluating the relationships between them using COI barcoding data, and providing information on their biology, mimetic relationships and feeding ecology. These objectives were met by collecting fresh material from the KwaZulu-Natal, Western Cape, Northern Cape and Free State provinces in South Africa. Fresh material of M. tersissima and M. chrysis were collected from their type localities, Komaggas and Port Nolloth (Northern Cape Province), respectively, for identification and DNA analyses. COI sequences generated, together with those sourced from Barcode of Life Data Systems (BOLD) and GenBank, were aligned using the CulstalW alignment algorithm in the Mega X software, and molecular phylogenetic analyses were performed using MrBayes for Bayesian Inference (BI) and RaxML for maximum likelihood (ML) analyses. Morphological examination of the collected and voucher material yielded 17 new species for the Afrotropical Region, namely M. basaliducta sp. nov. (♀, ♂, South Africa), M. bimaculata sp. nov. (♀, ♂, Mauritania), M. bispicula sp. nov. (♀, ♂, Namibia, South Africa), M. durbana sp. nov. (♀, ♂, South Africa, Zambia), M. felix sp. nov. (♀, ♂, Cameroon, Ethiopia, Malawi, Mozambique, Namibia, South Africa, Zambia, Zimbabwe), M. gagnoa sp. nov. (♀, ♂, Côte d’Ivoire, Mozambique, Mozambique, Tanzania), M. koingnaas sp. nov. (♂, South Africa), M. lata sp. nov. (♂, Namibia, South Africa), M. laxa sp. nov. (♀, South Africa), M. mediospina sp. nov. (♂, South Africa), M. parvotibialis sp. nov. (♀, ♂, Senegal), M. plana sp. nov. (♀, ♂, Ethiopia), M. quadrata sp. nov. (♀, Ethiopia), M. quinquemaculosa sp. nov. (♀, ♂, Namibia, South Africa), M. rivonosy sp. nov. (♀, ♂, Madagascar), M. sanipass sp. nov. (♂, South Africa) and M. scutellata sp. nov. (♂, South Africa). Furthermore, both sexes of M. beaufortia, as well as the male of M. tersissima, are redescribed. Both sexes of M. chrysis are described for the first time, as this species was only known from a juvenile. Of the previously known species, M. beaufortia (Botswana, Ethiopia, Lesotho, Namibia, South Africa, Zimbabwe) and M. chrysis (Côte d’Ivoire, Ethiopia, Lesotho, Namibia, South Africa, Tanzania) are widespread in the Afroptropics, while M. tersissima is only known from South Africa. Both the Bayesian inference and the maximum likelihood analysess recovered Micaria (sensu lato) as monophyletic with the inclusion of the subopaca group. The pulicaria species group was recovered as polyphyletic in both the BI and ML analyses. Four Afrotropical species, as well as the M. rossica Thorell, 1875/M. foxi Gertsch, 1933 group, formed a clade sister to M. formicaria (Sundevall, 1831). Eight of the Afrotropical species now have COI barcoding data uploaded to BOLD. 

scholarly journals Pretoria Radiocarbon Dates III

Radiocarbon ◽  
1986 ◽  
Vol 28 (3) ◽  
pp. 1133-1172 ◽  
Author(s):  
J C Vogel ◽  
Annemarie Fuls ◽  
Ebbie Visser
Keyword(s):  
South Africa ◽  
Southern Africa ◽  
Stone Age ◽  
Radiocarbon Dates ◽  
The North ◽  
Northern Cape

This list contains 14C dates pertaining to the Stone Age in southern Africa and covers the region from Zambia in the north to Natal and the northern Cape Province in South Africa. The southern and southwestern Cape Province are not included. Descriptions are based on information supplied by the submitters.

scholarly journals POLICE AS WORKERS: Police labour rights in Southern Africa and beyond

2016 ◽  
Author(s):  
Monique Marks ◽  
Jenny Fleming
Keyword(s):  
South Africa ◽  
Civil Rights ◽  
Southern Africa ◽  
African Region ◽  
International Council ◽  
Labour Rights ◽  
Union Movement ◽  
The World ◽  
Police Unions ◽  
International Phenomenon

Efforts by police organisations to unionise and to increase their social and labour rights is an international phenomenon, and one that is becoming  more vigorous in the Southern African region. However, many governments are wary of police unions and limit their rights, or refuse to recognise them at all. This gave impetus to the formation of the International Council of Police Representative Associations (ICPRA), in September 2006. Two of ICPRA’s aims are to assist and advise police unions all over the world and to provide the international police union movement with a voice for influencing policing futures. In South Africa, the Police and Civil Rights Union (POPCRU) is assisting police in the subregion and has become a symbol of what is possible for police even in repressive states. In a rapidly changing police labour environment, police unions have the capacity to confront existing (undemocratic) occupational cultures, to promote organisational accord and to forge positive reform.

scholarly journals Eliokarmos humanii (Hyacinthaceae, Ornithogaloideae), a new species from Namaqualand in South Africa and a new combination in the genus

Phytotaxa ◽  
2020 ◽  
Vol 474 (1) ◽  
pp. 87-92
Author(s):  
MARIO MARTÍNEZ-AZORÍN ◽  
MANUEL B. CRESPO ◽  
MARÍA ÁNGELES ALONSO-VARGAS ◽  
MICHAEL PINTER
Keyword(s):  
South Africa ◽  
New Species ◽  
Southern Africa ◽  
New Combination ◽  
Endemic Genus ◽  
Northern Cape ◽  
A New Species

A new species of the southern Africa endemic genus Eliokarmos, that includes the well-known chincherinchees, is described from the vicinity of Kotzesrus, Northern Cape Province of South Africa. Eliokarmos humanii sp. nov. is unique in the genus based on its single, slightly fleshy, suborbicular, convex leaf with ciliate margin, and the short subspiciform inflorescence with almost sessile flowers. A complete description is presented for this species, and data on morphology, ecology, and distribution are reported. In addition, Ornithogalum richtersveldensis, recently described from northwestern South Africa, is transferred to Eliokarmos based on its morphology and biogeography, and a new combination is presented for this species in the latter genus.

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