South African Journal of Science and Technology最新文献

{"title":"Curculionids in the diet of the white-quilled korhaan: more than just food?","authors":"O. Kok, S. Louw, A. C. Kok","doi":"10.4102/satnt.v24i4.180","DOIUrl":"https://doi.org/10.4102/satnt.v24i4.180","url":null,"abstract":"Maaginhoudontledings van 326 witvlerkkorhane (Eupodotis afraoides) wat oor ’n tydperk van 20 jaar (1984-2004) in die Vrystaat en Noord-Kaap versamel is, dui aan dat die voels as gemengde voeders, wat hoofsaaklik op insekte voed, beskou moet word. Gebaseer op droe massa vorm prooi-items van die Isoptera en Coleoptera die dominante voedselkomponent. Frekwensiegewys word kewersoorte, meer spesifiek lede van die Curculionidae-familie, verreweg die meeste benut. Aanduidings bestaan dat die snuitkewers weens hul grootte en relatiewe hardheid van die eksoskelet moontlik ’n bykomende funksie met betrekking tot die fisiese afbraakproses van growwe voedselitems in die spiermaag vervul.","PeriodicalId":30428,"journal":{"name":"South African Journal of Science and Technology","volume":"24 1","pages":"118-123"},"PeriodicalIF":0.0,"publicationDate":"2005-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70513224","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A decade of democracy: environmental management in a changing world","authors":"P. Aucamp","doi":"10.4102/SATNT.V24I1/2.167","DOIUrl":"https://doi.org/10.4102/SATNT.V24I1/2.167","url":null,"abstract":"Die wereld se fokus op die omgewing het begin met die konferensie van die Verenigde Nasies oor die menslike omgewing in Stockholm in 1972. Dit het gelei tot die vorming van die Verenigde Nasies se Omgewingsprogram (UNEP). Die nuwe belangstelling in die mens se rol in die omgewing het egter eers momentum gekry na die publikasie van die verslag “Our Common Future” deur die wereldkommissie oor ontwikkeling en die omgewing onder voorsitterskap van Gro Harlem Brundtland en die opvolgkonferensie ook genoem die Aarde Beraad in Rio de Janeiro in 1992. Die vernaamste produkte van hierdie konferensie was die “Earth Charter” en die Agenda 21 aksieplanne. Kort hierna, in 1994, het Suid-Afrika ’n nuwe regering gekry. Die nuwe Grondwet wat in 1996 aanvaar is, is een van die weinige in die wereld wat klousules oor die beskerming van die omgewing bevat. Sedert 1994 is omgewingswetgewing in Suid-Afrika aansienlik aangepas. Daar is byvoorbeeld ’n nuwe Nasionale Wet op Omgewingsbestuur, ’n Nasionale Waterwet, ’n Minerale en Petroleum Hulpbronontwikkelingswet, ’n Konsepwet op Luggehaltebeheer en vele meer. ’n Groot aantal nieregeringsorganisasies (NGOs) het die Rio-konferensie bygewoon. Van hulle, soos Greenpeace (en plaaslik Earthlife Africa), het drukgroepe ontwikkel wat groot druk op regerings geplaas het om meer aandag aan die beskerming van die omgewing te gee en die omgewing beter te bestuur. In dieselfde tyd is die resultate van wetenskaplike navorsing gepubliseer wat ’n groot impak op die mens se siening van die omgewing gemaak het. Die ontdekking van die gat in die osoonlaag en die versnelde wereldverwarming het wye belangstelling ontlok. Dit het gelei tot konvensies en protokolle wat deur die meeste lande van die wereld ondersteun word, byvoorbeeld 189 uit ’n moontlike 191 lande het die Montreal Protokol vir die Beskerming van die Osoonlaag geratifiseer teen Junie 2004. Reaksie van die privaat sektor het ook nie uitgebly nie en dit is vandag die norm om ook oor die sogenaamde “Triple Bottomline” (ekonomiese, sosiale en omgewingsaspekte) te rapporteer. Die vraag wat nou ontstaan is: wie of wat in die nuwe bedeling – die regering, druk van groen organisasies of reaksie op wetenskaplike navorsing – het die meeste invloed op die magdom nuwe wetgewing en die veranderde klem op omgewingsbestuur in beide die openbare en die privaat sektor gehad? In hierdie referaat word die invloed van al drie kortliks bespreek.","PeriodicalId":30428,"journal":{"name":"South African Journal of Science and Technology","volume":"24 1","pages":"21-27"},"PeriodicalIF":0.0,"publicationDate":"2005-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70513595","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Distribution and habitats of Gyraulus connollyi, snail intermediate host of intestinal flukes of the family Echinostomatidae, in South Africa","authors":"K. Kock, C. Wolmarans","doi":"10.4102/SATNT.V23I3.196","DOIUrl":"https://doi.org/10.4102/SATNT.V23I3.196","url":null,"abstract":"Hierdie artikel fokus op die geografiese verspreiding en habitats van Gyraulus connollyi, slaktussengasheer van ingewandsbotte van die familie Echinostomatidae,  soos gereflekteer deur die 969  vindplekke wat tans in die databasis van die Nasionale Varswaterslakversameling (NV) van Suid-Afrika op rekord is. Die voorkoms van hierdie spesie is deur versamelaars uit ’n totaal van 13 verskillende waterliggaamtipes gerapporteer, maar verreweg die grootste persentasie monsters is in spruite en riviere versamel en in habitats waarvan die water as standhoudend, helder van kleur en vars beskryf is. ’n Oorwegend klipperige substratum en die voorkoms van plantegroei is ook vir die grootste persentasie vindplekke vermeld. Die effekgrootte is vir elke veranderlike afsonderlik bereken om die belangrikheid daarvan vir die voorkoms van hierdie spesie te bepaal. ’n Geintegreerde besluitnemingsboom wat uit die data saamgestel is, het getoon dat temperatuur, hoogte bo seevlak en waterliggame die belangrikste van die ondersoekte faktore is wat die geografiese verspreiding van hierdie spesie kan beinvloed. Dit word ondersteun deur die effekgroottewaardes wat vir elke faktor bereken is. ’n Temperatuurindeks wat vir al die spesies in die databasis bereken is, het G. connollyi sewende uit 53 geplaas op grond van sy assosiasie met lae temperature. Alhoewel echinostomose nog nie by mense in Afrika gediagnoseer is nie, word kommer uitgespreek oor die omstandigheid dat G. connollyi in staat is om as eerste-tussengasheer vir die transmissie van echinostome op te tree.","PeriodicalId":30428,"journal":{"name":"South African Journal of Science and Technology","volume":"23 1","pages":"79-86"},"PeriodicalIF":0.0,"publicationDate":"2004-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70513411","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Logistics management: its origin, conceptual evolution and meaning as a contemporary field of study","authors":"W. Pienaar","doi":"10.4102/SATNT.V22I2/3.212","DOIUrl":"https://doi.org/10.4102/SATNT.V22I2/3.212","url":null,"abstract":"Hierdie artikel beskryf die oorsprong van die woord logistiek, stip die ontwikkeling daarvan uit, en verklaar die hedendaagse betekenis daarvan as ’n studiegebied in ’n bestuurskonteks. Die ontwikkelingsgang van die begrip word aangedui vanaf die oorsprong daarvan in Grieks, met inagneming van die opeenvolgende opname daarvan in Laat Latyn, Frans en Nederlands, tot by die huidige gebruik daarvan in Afrikaans. Die vestiging van die Franse logistique gedurende die Napoleontiese oorloe, en die uitbreiding daarvan na ’n bedryfsbegrip na afloop van die Tweede Wereldoorlog word verduidelik. Die ontwikkelingsgang wat die betekenis van die konsep sedertdien in bedryfsverband ondergaan het, word bespreek. Betekenisse van logistiek, soos dit tans in die bedryfslewe gebesig word, word verskaf. Vervolgens bied die artikel ’n eietydse definisie van logistiek in bedryfsverband. Daar word aangetoon hoe doeltreffende bedryfslogistiek waarde toevoeg. Ten slotte word die primere aktiwiteite wat in die logistieke voorsieningskanaal van produkte voorkom kortliks bespreek.","PeriodicalId":30428,"journal":{"name":"South African Journal of Science and Technology","volume":"44 1","pages":"52-60"},"PeriodicalIF":0.0,"publicationDate":"2003-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70513307","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A decade of annual conferences of the South African Society for Atmospheric Sciences","authors":"J. Lutjeharms, D. Roos","doi":"10.4102/SATNT.V18I2.722","DOIUrl":"https://doi.org/10.4102/SATNT.V18I2.722","url":null,"abstract":"The establishment of a national society for the furtherance of a specific scientific discipline is an important milestone for the development of such a discipline in any country.","PeriodicalId":30428,"journal":{"name":"South African Journal of Science and Technology","volume":"18 1","pages":"69"},"PeriodicalIF":0.0,"publicationDate":"1999-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70513118","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Water quality of the Modder River","authors":"N. Koning","doi":"10.4102/SATNT.V18I4.733","DOIUrl":"https://doi.org/10.4102/SATNT.V18I4.733","url":null,"abstract":"Seasonal and spatial patterns in the Modder River system, the influence of Botshabelo's sewage outflow’ on the water quality of the river, as well as the presence of any toxic compounds were determined. The Modder and Klein Modder Rivers do not follow distinctive seasonal patterns in terms of chemical parameters.","PeriodicalId":30428,"journal":{"name":"South African Journal of Science and Technology","volume":"18 1","pages":"126-127"},"PeriodicalIF":0.0,"publicationDate":"1999-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70513207","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The use of ordination techniques for the evaluation of rehabilitation success of ash dams associated with coal-driven power stations","authors":"T. Morgenthal, S. Cilliers, K. Kellner","doi":"10.4102/SATNT.V18I4.730","DOIUrl":"https://doi.org/10.4102/SATNT.V18I4.730","url":null,"abstract":"Ecological monitoring of rehabilitated plant communities can be useful to improve the management of rehabililated areas.","PeriodicalId":30428,"journal":{"name":"South African Journal of Science and Technology","volume":"18 1","pages":"106-115"},"PeriodicalIF":0.0,"publicationDate":"1999-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70513142","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Die nuwe aborsiewetgewing","authors":"E. D. Jonge","doi":"10.4102/SATNT.V18I1.710","DOIUrl":"https://doi.org/10.4102/SATNT.V18I1.710","url":null,"abstract":"","PeriodicalId":30428,"journal":{"name":"South African Journal of Science and Technology","volume":"18 1","pages":"2-4"},"PeriodicalIF":0.0,"publicationDate":"1999-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70513095","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Epidemics in ancient Rome and other Mediterranean countries","authors":"F. Retief","doi":"10.4102/SATNT.V18I1.713","DOIUrl":"https://doi.org/10.4102/SATNT.V18I1.713","url":null,"abstract":"Epidemic diseases recorded in ancient Rome and surrounding Mediterranean countries from 53 BC to the onset of the Christian era are reviewed. With few exceptions historians omitted to record clinical details, which makes identification of diseases very difficult.","PeriodicalId":30428,"journal":{"name":"South African Journal of Science and Technology","volume":"16 1","pages":"17-23"},"PeriodicalIF":0.0,"publicationDate":"1999-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70512674","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hoe om ’n vakkundige verslag te skryf","authors":"W. Pienaar","doi":"10.4102/SATNT.V17I4.708","DOIUrl":"https://doi.org/10.4102/SATNT.V17I4.708","url":null,"abstract":"Riglyne word verskaf vir doeltreffende verslagdoening van vakkundige ondersoeke wat vir ’n klient uitgevoer word.","PeriodicalId":30428,"journal":{"name":"South African Journal of Science and Technology","volume":"86 1","pages":"149-167"},"PeriodicalIF":0.0,"publicationDate":"1998-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70513010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}