154 research outputs found
Establishing project management guidelines for successfully managing resettlement projects
Although millions of people globally are displaced annually, resettlement has a poor history for achieving the objective of leaving people who are resettled 'no worse off after project implementation than before'. While excellent guidelines and policies for resettlement have been established, resettlement/displacement projects still do not succeed in resettling affected peoples in a way that they are eventually better off. Consensus was reached by a Delphi panel of experts on a set of guidelines for resettlement projects. It is proposed that, supplementing the existing frameworks and guidelines for resettlement with well-established project management principles - including a phased project management approach - the chances of executing a resettlement project successfully are much higher. This paper proposes an improved framework and valuable guidelines for future resettlement projectshttp://www.journals.co.za/ej/ejour_busman.htmlam2013ai201
Saving our surfaced road network through labour intensive water-proofing and restoration
Papers presented virtually at the 41st International Southern African Transport Conference on 10-13 July 2023Similar to many developing countries, most of the surfaced road network in South Africa
has received little in terms of preventative maintenance over a number of decades. The all
too familiar consequences of this neglect is seen on many of the rural and urban road
networks (especially during the wet season) with a general deterioration in surface
condition and riding quality and the formation of numerous potholes. Consequently, road
authorities are subjected to considerable community and hence, political pressure to
urgently address the deterioration of the existing surfaced road networks. In addition, road
authorities are also under considerable pressure to increase the amount of labour
opportunities in the provision of road infrastructure. Road authorities are in a situation
where both of these aspects can be addressed with immediate effect through the
implementation of proven and tested New (Nano) Modified Emulsion (NME) technologies,
incorporating Nano-Polymer Nano-Silane (NPNS) products. These technologies have
been adapted and adjusted from the built environment for use in the roads industry in
South Africa. Numerous laboratory investigations, Accelerated Pavement Tests (APT) and
practical implementation on a number of roads since 2015 have proven the technology to
be cost-effective. The same NME technologies, incorporating applicable NPNS products,
can be used to protect the integrity of the existing surfaced road networks. These products
diluted in water, and applied by hand sprayers, will water-proof existing surfacings and
prevent future water damage and create numerous job opportunities with little training. In
addition, the same NME technologies can be used to restore some severe distress already
existing on many of the surfaced roads. This paper demonstrates the applicability and
practicality of the NME incorporating NPNS technologies using available labour with little
training for:
• Protection of the existing paved road network and the prevention of severe distress in
the presence on water (e.g. pothole forming); and
• Restoring some of the existing surfacings already is severe distress, such a pothole
repairs and surface deterioration
Enhancing performance in cricket by using South African cricket coaches’ experiences in an ecological intervention
Sport psychology in South Africa has for many years been characterised by the deficit
perspective on human nature focusing on “what is wrong with sports people”. Psychological
Skills Training (PST) programmes have been used to correct these deficits until optimal
performance can happen in the “absence of discomfort.” In this study, an asset perspective to
performance enhancement was employed, i.e. the Mindfulness-Acceptance-Commitment (MAC)
approach which views optimal performance as happening “despite discomfort”. Sport
psychologists present these interventions (PST and MAC) predominantly to cricket players, often
neglecting other important role-players such as coaches. The aim of this study was to move away
from the deficit perspective and individualistic interventions to an asset perspective with an
ecological intervention. This was attained by using South African cricket coaches’ experiences of
the MAC programme in an experiential learning context. The extent to which experiential
learning occurred was established through analyzing 18 individual in-depth, semi-structured
interviews with coaches using Interpretive Phenomenological Analysis (IPA). The major findings
were that coaches experienced the MAC programme as flexible, accessible and a developmental
psychological tool, which increased their knowledge of sport psychology. Coaches enjoyed the
MAC programme and found the experiential learning and accompanying manual valuable.http://www.journals.co.za/content/journal/ajpherd1am2017Biokinetics, Sport and Leisure SciencesPsycholog
Using sap flow data to assess variations in water use and water status of apple orchards of varying age groups in the Western Cape Province of South Africa
No accurate quantitative information currently exists on how water use of apple (Malus domestica) orchards varies from planting to full-bearing age, leading to poor irrigation and water allocation decision making. This study sought to address this knowledge gap by investigating how the water use and tree water status vary with canopy cover, cultivar, and climatic conditions in 12 orchards growing in prime apple-producing regions in South Africa. The orchards were planted to the Golden Delicious/Golden Delicious Reinders cultivars which are widely planted in South Africa and the Cripps’ Pink/Cripps’ Red/Rosy Glow which are high-value lateseason cultivars. The performance of two transpiration reduction coefficients, one based on sap flow (Ksf) and the other based on soil water depletion (Ks) (FAO approach) were evaluated against the midday stem water potential (MSWP) in all the orchards. While canopy cover had a clear effect on the whole-tree sap flow rates, there were no significant differences in the transpiration per unit leaf area among the cultivars. The daily average sap flux density under unstressed conditions was highest (~284 cm3∙cm–2) in the medium canopy cover orchards (30–44% fractional cover), followed by the mature orchards (~226 cm3∙cm–2), and was lowest in the young orchards (~137 cm3∙cm–2). Canopy cover rather than growing season length had a greater effect on seasonal total water use. Peak daily orchard transpiration ranged from 1.7 mm for young Golden Delicious Reinders trees to 5.0 mm in mature Golden Delicious trees that were maintained with large canopies to reduce sunburn damage to the fruit. For the red cultivars, the peak daily transpiration ranged from 2.0 to 3.9 mm, and the mature trees were maintained with less dense canopies to facilitate the development of the red fruit colour. The less dense canopies on the red cultivars had water-saving benefits since the seasonal total transpiration was lower relative to the Golden Delicious cultivar. The sap flow derived stress coefficient was strongly correlated to the MSWP (R2 ~ 0.60–0.97) in all the orchards while Ks was not able to detect plant stress due to over-irrigation.
Keywords: cultivar canopy cover transpiration reduction xylem water potentia
Anisotropic flow of charged hadrons, pions and (anti-)protons measured at high transverse momentum in Pb-Pb collisions at TeV
The elliptic, , triangular, , and quadrangular, , azimuthal
anisotropic flow coefficients are measured for unidentified charged particles,
pions and (anti-)protons in Pb-Pb collisions at TeV
with the ALICE detector at the Large Hadron Collider. Results obtained with the
event plane and four-particle cumulant methods are reported for the
pseudo-rapidity range at different collision centralities and as a
function of transverse momentum, , out to GeV/.
The observed non-zero elliptic and triangular flow depends only weakly on
transverse momentum for GeV/. The small dependence
of the difference between elliptic flow results obtained from the event plane
and four-particle cumulant methods suggests a common origin of flow
fluctuations up to GeV/. The magnitude of the (anti-)proton
elliptic and triangular flow is larger than that of pions out to at least
GeV/ indicating that the particle type dependence persists out
to high .Comment: 16 pages, 5 captioned figures, authors from page 11, published
version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/186
Centrality dependence of charged particle production at large transverse momentum in Pb-Pb collisions at TeV
The inclusive transverse momentum () distributions of primary
charged particles are measured in the pseudo-rapidity range as a
function of event centrality in Pb-Pb collisions at
TeV with ALICE at the LHC. The data are presented in the range
GeV/ for nine centrality intervals from 70-80% to 0-5%.
The Pb-Pb spectra are presented in terms of the nuclear modification factor
using a pp reference spectrum measured at the same collision
energy. We observe that the suppression of high- particles strongly
depends on event centrality. In central collisions (0-5%) the yield is most
suppressed with at -7 GeV/. Above
GeV/, there is a significant rise in the nuclear modification
factor, which reaches for GeV/. In
peripheral collisions (70-80%), the suppression is weaker with almost independently of . The measured nuclear
modification factors are compared to other measurements and model calculations.Comment: 17 pages, 4 captioned figures, 2 tables, authors from page 12,
published version, figures at
http://aliceinfo.cern.ch/ArtSubmission/node/284
Measurement of charm production at central rapidity in proton-proton collisions at TeV
The -differential production cross sections of the prompt (B
feed-down subtracted) charmed mesons D, D, and D in the rapidity
range , and for transverse momentum GeV/, were
measured in proton-proton collisions at TeV with the ALICE
detector at the Large Hadron Collider. The analysis exploited the hadronic
decays DK, DK, DD, and their charge conjugates, and was performed on a
nb event sample collected in 2011 with a
minimum-bias trigger. The total charm production cross section at TeV and at 7 TeV was evaluated by extrapolating to the full phase space
the -differential production cross sections at TeV
and our previous measurements at TeV. The results were compared
to existing measurements and to perturbative-QCD calculations. The fraction of
cdbar D mesons produced in a vector state was also determined.Comment: 20 pages, 5 captioned figures, 4 tables, authors from page 15,
published version, figures at
http://aliceinfo.cern.ch/ArtSubmission/node/307
Particle-yield modification in jet-like azimuthal di-hadron correlations in Pb-Pb collisions at = 2.76 TeV
The yield of charged particles associated with high- trigger
particles ( GeV/) is measured with the ALICE detector in
Pb-Pb collisions at = 2.76 TeV relative to proton-proton
collisions at the same energy. The conditional per-trigger yields are extracted
from the narrow jet-like correlation peaks in azimuthal di-hadron correlations.
In the 5% most central collisions, we observe that the yield of associated
charged particles with transverse momenta GeV/ on the
away-side drops to about 60% of that observed in pp collisions, while on the
near-side a moderate enhancement of 20-30% is found.Comment: 15 pages, 2 captioned figures, 1 table, authors from page 10,
published version, figures at
http://aliceinfo.cern.ch/ArtSubmission/node/350
Transverse momentum spectra of charged particles in proton-proton collisions at GeV with ALICE at the LHC
The inclusive charged particle transverse momentum distribution is measured
in proton-proton collisions at GeV at the LHC using the ALICE
detector. The measurement is performed in the central pseudorapidity region
over the transverse momentum range GeV/.
The correlation between transverse momentum and particle multiplicity is also
studied. Results are presented for inelastic (INEL) and non-single-diffractive
(NSD) events. The average transverse momentum for is (stat.) (syst.) GeV/ and
\left_{\rm NSD}=0.489\pm0.001 (stat.) (syst.)
GeV/, respectively. The data exhibit a slightly larger than measurements in wider pseudorapidity intervals. The results are
compared to simulations with the Monte Carlo event generators PYTHIA and
PHOJET.Comment: 20 pages, 8 figures, 2 tables, published version, figures at
http://aliceinfo.cern.ch/ArtSubmission/node/390
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