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Characterization of the plankton community in the lower Rincon Delta: Investigations regarding new approaches to managementBuyukates, Yesim 17 February 2005 (has links)
In light of increasing harmful algal blooms and the need to protect human health and aquatic resources, proactive management approaches merit further study. For this purpose I conducted field samplings to characterize plankton community composition and laboratory experiments to test some approaches to new management schemes in the lower Rincon Delta. On site measurements and microscopic analysis showed that environmental parameters and plankton community composition varied considerably among sampling stations and sampling dates. A recent modeling study suggested that manipulation of freshwater inflow to estuaries might prevent phytoplankton blooms and enhance secondary productivity. To test this theory I conducted three semi-continuous design and flow-through incubation design experiments using natural plankton assemblages. I investigated the effect of two different pulsing regimes of inflow and nutrient loading on zooplankton densities, and phytoplankton biomass and diversity. Despite differences in zooplankton structure and phytoplankton community composition between the two experiment designs, the results confirmed that pulsed inflows might alter plankton dynamics. My findings showed that 3-day pulse treatments consistently supported greater zooplankton densities and higher phytoplankton species diversity when compared to 1-day pulse treatments. In addition, accumulation of phytoplankton biovolume remained low during 3-day pulse treatments. Differences in zooplankton performance between 3-day pulse and 1-day pulse inflow treatments were likely due to the ability of phytoplankton to uptake and store greater amounts of nutrients under conditions of 3-day pulse inflow. This resulted in food of higher quality for zooplankton, and might have supported greater zooplankton population growth rates. Additionally, in an attempt to understand the mechanisms leading to high biodiversity in aquatic ecosystems, I built a resource-storage model and studied the effects of resource-storage on competition of multiple phytoplankton species on multiple abiotic resources. I compared this model with a well-established multi-species competition model. My results showed that for certain species combinations a resource-storage-based model can generate dissimilar outcomes when compared to a model without resource-storage.
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Foreign direct investment and its importance to the economy of South AfricaAsafo-Adjei, Augustina 30 November 2007 (has links)
This study focuses on foreign direct investment ("FDI") and its importance to the economy of South Africa. Recognising that FDI, notwithstanding the type, can contribute to economic growth and development, most countries including South Africa are constantly working to attract it, and hence its demand has become highly competitive. However, FDI does not go without some negative effects, such as conflicts between host and investor country, and the creation of damaging competition to local firms. These negative effects could be minimised if policies and strategies for the promotion and attraction of FDI is part of, and integrated into, general economic development and economic reform policies, and not seen in isolation. Although South Africa has implemented strategies to attract more FDI, a refinement of some of these policies is needed if the country is to be successful in this regard. / Economics / M. Comm. (Economics)
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International capital inflows in emerging markets: the role of institutionsNxumalo, Immaculate Simiso 08 1900 (has links)
The primary objective of this study was to examine the broader impact of institutional
quality on enhancing foreign direct investment (FDI) and foreign portfolio investment (FPI)
inflows in a sample of twelve emerging market economies for the period 2007 to 2017. We
specifically sought to answer questions related to the key drivers of FDI and FPI inflows into emerging markets, with a particular emphasis on the role played by institutional quality factors. We further sought to interrogate the long-run and causal relationships between the key variables of FDI, FPI and institutional quality, in respect of the sample of emerging markets. The study employed the Principal Components Analysis (PCA) to construct a composite index for institutional quality composed of the six Worldwide Governance Indicators. Various other econometric models were applied, including the dynamic panel data generalised method of moments (GMM) model, the panel autoregressive distributed lag (ARDL) model for dynamic heterogeneous panels, and the panel vector error correction model (VECM). The results revealed that FDI in the selected emerging markets was, in the main, attracted by economic growth and institutional quality. Institutional quality, economic rowth and capital account openness were positive determinants of FPI inflows; however, stock market development stood out as the foremost determinant factor. In addition to finding long-run, cointegrating relationships between the key variables, it emerged that there was bi-directional causality between FDI and FPI, as well as between FDI and institutional quality in the long run. Despite the latter findings, the results further suggested that the long-run relationship between the two foreign capital inflows, i.e. FDI and FPI, was more of a substitutability or trade-off nature in our sample of emerging markets. In light of these findings, we recommended that it would be in the best interests of these emerging markets if the responsible policymakers continued to liberalise these economies. Further, it was shown that in order to attract inward international capital flows, financial liberalisation should be coupled with the strengthening of the domestic institutional environment.Strengthening institutions could curtail the persistence of institutional weaknesses and insulate emerging market economies from the adverse effects of volatile capital flows, and in the long-run enhance international capital inflows. / Inhloso enkulu yalolu cwaningo kwaye kuwukuhlola umthelela obanzi kwizinga leziko
ekuqiniseni uhlelo lokutshalwa ngqo kwezimali ezweni langaphandle (foreign direct
investment; FDI) kanye nemali engena mayelana nokuthengwa kwamagugu (shares, stocks
and bonds) angenisa imali ezweni elingaphandle (foreign portfolio investment; FPI)
kwizimakethe zamazwe eziyishumi nambili esikhathini esiphakathi kuka 2007 ukufika ku
2017. Empeleni besifuna ukuphendula imibuzo emayelana nezikhwezeleli ezisemqoka
eziheha uhlelo lwe-FDI kanye ne-FPI ezimakethe ezifufusayo, ikakhulu kugxilwe kwindima
edlalwa yizinto ezihlobene nezinga leziko. Siqhubekela phambili nokuphenya izinhlobo
zobudlelwano besikhathi esinde kanye nobudlelwano obuyimbangela phakathi
kwamavarebuli asemqoka e-FDI, i-FPI kanye nezinga leziko, mayelana nesampuli
yezimakethe ezisafufusayo. Ucwaningo lusebenzise uhlelo lwe-Principal Components
Analysis (PCA) ukwakha imvange yezinkomba ukwenzela izinga leziko eliqukethe izinkomba
eziyisithupha ezibizwa phecelezi nge-Worldwide Governance Indicators. Amanye amamodeli
alinganisa ezomnotho asetshenzisiwe, kuxutshwa phakathi idatha yamaphaneli
eguquguqukayo ebizwa nge-dynamic panel data generalised method of moments (GMM)
model, uhlelo lwe-panel autoregressive distributed lag (ARDL) model ukwenzela amaphaneli
ahlukahlukene futhi aguquguqukayo, kanye nohlelo lwe-panel vector error correction model
(VECM). Imiphumela iveze ukuthi i-FDI ezimakethe ezikhethiwe ezisafufusa, esikhathini
esiningi, iye yahehwa ukuhluma komnotho kanye nezinga leziko. Izinga leziko, ukuhluma
komnotho kanye nokuvuleka kwe-akhawunti yemali bekuyizinto eziyizinkomba ezinhle
zokungena kwe-FPI; yize-kunjalo, ukuthuthukiswa kwemakethe yesitoko kuvele kwagqama
ngaphezulu njengenkomba ekhombisayo. Ukwengeza phezu kolwazi olutholakele
esikhathini esinde, ukuhlangana kobudlelwano obuphakathi kwamavarebuli asemqoka,
kuye kwavela ukuthi kwakunezimbangela ezikhomba izindlela ezimbili zokungena
kwezimali ezitshalwa ngaphandle, zona yilezi i-FDI kanye nezinga leziko esikhathini esinde.
Naphezu kolwazi olutholakele kamuva, imiphumela iqhubeka nokuphakamisa ukuthi
ubudlelwano besikhathi eside obuphakathi kwezinhlelo zokutshalwa kwezimali ezivela
emazweni angaphandle, lezo zinhlelo yilezi, i-FDI kanye ne-FPI, bezingendlela ikakhulukazi
yokushintshana/yokumisela noma yokushintshelana ngokuhweba kwisampuli yethu
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yezimakethe ezisafufusayo. Mayelana nalolu lwazi olutholakele, sincome ukuthi
kuzohambisana nokuthandwa yilezi zimakethe ezisafufusa uma ngabe abenzi bemigomo
ababandakanyekayo baqhubeke nokususa izihibe zomnotho kula mazwe asafufusa.
Ngaphezu kwalokho, kuye kwavezwa ukuthi ukuze kuhehwe izimali zamazwe angaphandle,
uhlelo lokususwa kwezihibe zomnotho lufanele luhambisane nokuqiniswa kwesizinda
esiyiziko lasekhaya. Ukuqiniswa kwamaziko kungaqeda isimo esintengayo seziko futhi
kungasusa izimakethe zamazwe asafufusayo kwisimo esingagculisi sezimali ezingenayo,
kanti esikhathini eside lokhu kungaqinisa ukutshalwa ukungena kwezimali ezivela
emzaweni angaphandle / Maikemisetso magolo a thutopatlisiso eno e ne e le go tlhatlhoba ditlamorago ka bophara tsa
boleng jwa ditheo mo go tokafatseng keleloteng ya dipeeletso tsa tlhamalalo tsa kwa
dinageng tse dingwe (FDI) le dipeeletso tsa dipotefolio tsa kwa dinageng tse dingwe (FPI)
mo sampoleng ya diikonomi tse somepedi tsa mebaraka e e tlhagelelang mo pakeng ya 2007
go fitlha 2017. Re ne re totile go araba dipotso tse di malebana le ditsamaisi tsa botlhokwa
tsa keleloteng ya FDI le FPI mo mebarakeng e e tlhagelelang, go lebeletswe thata seabe sa
dintlha tsa boleng jwa ditheo. Gape re ne re lebeletse go tlhotlhomisa go nna sebaka se se
telele le sebako sa dikamano magareng ga dipharologantsho tsa botlhokwa tsa FDI, FPI le
boleng jwa ditheo, malebana le sampole ya mebaraka e e tlhagelelang. Thutopatlisiso e
dirisitse Tokololo ya Dintlha tsa Botlhokwa (PCA) go aga tshupane ya dikarolo ya boleng jwa
ditheo e e nang le Disupi di le thataro tsa Lefatshe lotlhe tsa Bolaodi. Go dirisitswe gape dikao
tse dingwe tse di farologaneng tsa ikonometiriki, go akarediwa sekao sa dynamic panel data
generalised method of moments (GMM) sa data ya phanele e e farologaneng, sekao sa panel
autoregressive distributed lag (ARDL) sa diphanele tse di farologaneng le sekao sa panel
vector error correction (VECM). Dipholo di senotse gore FDI mo mebarakeng e e
tlhophilweng e e tlhagelelang e ne tota e ngokiwa ke kgolo ya ikonomi le boleng jwa ditheo.
Boleng jwa ditheo, kgolo ya ikonomi le go bulega ga akhaonto ya kapitale e nnile diswetsi tse
di siameng tsa keleloteng ya FPI; fela tlhabololo ya mebaraka ya setoko e tlhageletse jaaka
ntlha e e kwa pele e e swetsang. Go tlaleletsa mo go fitlheleleng botsalano jwa pakatelele le
jo bo kopanang jwa dipharologantsho tsa botlhokwa, go tlhageletse gore go na le go sebako
sa dintlhapedi magareng ga FDI le FPI gammogo le magareng ga FDI le boleng jwa ditheo mo
pakeng e e telele. Le fa go ntse go na le diphitlhelelo tse di kailweng la bofelo, dipholo gape
di tshitshinya gore botsalano jwa paka e e telele magareng ga keleloteng ya kapitale ya kwa
ntle k.g.r. FDI le FPI ke jwa mofuta wa go emisetsa se sengwe ka se sengwe mo sampoleng
ya rona ya mebaraka e e tlhagelelang. Ka ntlha ya diphitlhelelo tseno, re atlenegisa gore go
tlaa bo go le mo dikgatlhegelong tsa mebaraka eno e e tlhagelelang gore ba ba rweleng
maikarabelo a go dira dipholisi ba ka tswelela go repisa diikonomi tseno. Mo godimo ga moo,
go bonagetse gore go ngokela kelelo e e tsenang ya kapitale ya boditšhabatšhaba, go repisiwa
ga merero ya ditšhelete go tshwanetse ga tsamaisiwa le maatlafatso ya tikologo ya ditheo tsa
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selegae. Go maatlafatsa ditheo go ka fedisa go tswelela pele ga makoa a ditheo le go sireletsa
diikonomi tsa mebaraka e e tlhagelelang mo ditlamoragong tse di maswe tsa dikelelo tse di
maswe tsa kapitale, mme kwa bokhutlong, go tokafadiwe kelelo ya kapitale ya
boditšhabatšhaba / Finance, Risk Management and Banking / M. Com. (Financial Management)
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