3,048 research outputs found
Typhlodromus (Anthoseius) muliebris van der Merwe
No full text<i>Typhlodromus</i> (<i>Anthoseius</i>) <i>muliebris</i> van der Merwe <p> <i>Typhlodromus</i> (<i>Anthoseius</i>) <i>muliebris</i> van der Merwe 1968: 28; Moraes <i>et al.</i> 2004: 337; Chant & McMurtry 2007: 155; Ueckermann <i>et al.</i> 2008: 69.</p> <p> <i>Amblydromella muliebris</i>, Moraes <i>et al.</i> 1986: 168.</p> <p> <i>Amblydromella</i> (<i>Amblydromella</i>) <i>muliebris</i>, Denmark & Welbourn 2002: 308.</p> <p> This species belongs to the large <i>rhenanus</i> species group (Chant and McMurtry 1994). It was described by van der Merwe (1968) from South Africa and then reported by El-Banhawy and Knapp (2011) from Kenya. The biology of this species is totally unknown. This is the first report of this species from Mauritius and from a country outside the Africa continent.</p> <p> <b>World distribution</b>: Kenya, South Africa.</p> <p> <b>Specimens examined</b>: 3 ♀♀ in total. <b>Chamouny</b> (aasl 192 m, lat. 20°28 ′ 42 ″ S, long. 57°29 ′ 11 ″ E), 3 ♀♀ on <i>Solanum torvum</i> Swartz (Solanaceae), 31/X/2018.</p> <p> <b>Remarks</b>: morphological and morphometric characters and all measurements of our specimens fit well measurements of the original description by van der Merwe (1968) and new descriptions by Ueckermann <i>et al.</i> (2008) and El-Banhawy and Knapp (2011) concerning specimens from South Africa and Kenya, respectively.</p>Published as part of <i>Kreiter, Serge & Abo-Shnaf, Reham I. A., 2020, New records of phytoseiid mites from Mauritius Island (Acari: Mesostigmata, pp. 520-545 in Acarologia 60 (3)</i> on page 539, DOI: 10.24349/acarologia/20204382, <a href="http://zenodo.org/record/4503446">http://zenodo.org/record/4503446</a>
The determinants of the readiness to let go among senior generation owner-managers of small and medium-sized family businesses
No full textThe objective of this study was to assess the determinants of the readiness of the senior generation owner-managers to finally transfer the management and control of the family business to the younger generation. Data from 504 questionnaires linked to 81 family businesses were collected and analysed. An Oblimin oblique rotation was carried out on the principal components of the exploratory factor analysis. Five factors with eigen-values greater than one, explaining 62.64 per cent of the variance, were extracted. These five factors describing the theoretical dimensions of the dependent variable were: the senior generation owner-manager’s readiness to let go, and the independent variables of retirement planning, perceived suitability of the successor, estate planning, and the perceived liquidity of the business after the transfer. No significant practical differences relating to these five factors could be found between the perceptions of male and female respondents, the senior and younger generation family members or family members involved in medium-sized or small businesses. Practical recommendations are suggested to ensure a smooth final transfer of the management and control of the business to the younger generation family members
Typhlodromus capparidis Van der Merwe
No full text<i>Typhlodromus capparidis</i> Van der Merwe <p>(Fig. 85)</p> <p> <i>Typhlodromus capparidis</i> Van der Merwe, 1968: 26.</p> <p> <b>Material examined.</b> Kenya, 1 female, Mt. Kenya, altitude 2000 m, bush land, July 13, 2004 (El-Banhawy).</p> <p> <b>Female:</b> Dorsal shield with lateral striations, 260 long, 130 wide. Measurements of dorsal setae: j1 12, j3 25, j4 16, j5 18, j6 26, J2 30, J5 8, z2 23, z3 25, z4 35, z5 23, Z4 40, Z5 48, s4 28, s6 25, S2 35, S4 30, S5 26, r3, R1 25, JV5 46. Setae Z 4, Z5, serrated, remaining setae smooth. Peritrematal shield fused anteriorly with dorsal shield, reaching level of j1. Genital shield 50 wide. Ventri-anal shield 83 long, 58 wide, with a pair of small elliptical preanal pores close to each other and four pairs of pre-anal setae (JV1, JV2, JV3, ZV2). Two pairs of metapodal platelets, two pairs of sigillar sclerites and four pairs of setae surrounding ventri-anal shield. Fixed digit of chelicera with four teeth, movable digit with three teeth. Spermatheca calyx bell-shaped, 16 long, 9 wide, atrium inconspicuous. Macroseta sharp pointed, St IV 50 Chaetotaxy: genu II 2, 2 / 0, 2/0, 1, genu III 1, 2 /1, 2/0, 1.</p> <p> <b>Remarks.</b> The female holotype and male paratype were collected from Nelspruit, South Africa, April 1, 1955, P. A. J. Ryke (Van der Merwe, 1968). The Kenyan specimens show some variations from the holotype. For example, the pre-anal pores are small, elliptical and closer together, and the macroseta on tarsus IV is twice as long. The sternal shield is not distinct in the Kenyan specimen.</p>Published as part of <i>El-Banhawy, E. M. & Knapp, M., 2011, Mites of the family Phytoseiidae Berlese from Kenya (Acari: Mesostigmata) 2945, pp. 1-176 in Zootaxa 2945 (1)</i> on pages 53-54, DOI: 10.11646/zootaxa.2945.1.1, <a href="http://zenodo.org/record/5282557">http://zenodo.org/record/5282557</a>
The assessment of the family vision generation process in small and medium-sized family businesses
No full textThe objective of this study was to assess the family vision generation process in small and medium-sized family businesses. Data from 489 questionnaires administered to 79 family businesses were collected and analysed. An Oblimin oblique rotation was performed on the principal components of the exploratory factor analysis. Three factors with eigenvalues greater than one were extracted, explaining 61.93% of the variance, describing the theoretical dimensions of the generation of the family vision, the commitment of the younger generation family members to family business continuity and the commitment of the senior generation family members to family business continuity. The results of this study indicate that a significant proportion of the variation in the generation of the family vision is explained by the commitment of the senior and younger generation family members to family business continuity. No practically significant differences in the mean values could be found between the three extracted factors and the demographic variables in this study. Recommendations are offered to utilise the questionnaire as a measuring instrument. Practical recommendations are suggested to ensure an effective family vision generation process in small and medium-sized family businesses.http://search.sabinet.co.za/WebZ/Authorize?sessionid=0&next=ej/ej_content_sabr.html&bad=error/authofail.htm
Development of a guidance and Intra-Arterial flow monitoring catheter
No full textThesis (MEng)--Stellenbosch University, 2016.ENGLISH ABSTRACT: This thesis entails the development and testing of devices that can aid in
guiding a needle into a blood vessel. Furthermore, a concept flow meter is
also developed and tested. Physicians often have difficulty placing a needle in
blood vessels. For a number of procedures access to blood vessels are required.
Investigating methods to ease this process is thus beneficial to the medical
field. Likewise, measuring blood flow is also of importance in the medical
field. Measuring blood flow to the brain can prevent brain ischemia, which
can lead to death of brain tissue.
Near infrared (NIR) light is used to guide the needle towards a blood vessel.
Two optic fibre strands are placed inside the needle, one to transmit NIR light
and one to receive reflected light. The reflected light, when pointing at blood,
is different from other tissue types. The in vitro and in vivo tests both showed
that there is a statistically significant difference (p < 0.001) in reflected light
when pointing at and away from a blood vessel.
Electrical impedance is used to determine when the needle enters a blood
vessel. A sine wave is generated and passed through biological tissue. The
measured impedance is different for blood and other tissue types. It was found
that when a signal of 29.85 kHz was used, there was a statistically significant
difference (p < 0.001) between blood and muscle and blood and fat.
The flow meter works on the principle of thermal convection. The concept
device that is developed, has an ambient temperature sensor and a second
temperature sensor wrapped in a heating coil. In the presence of fluid flow, heat
is carried away from the heater by thermal convection, causing a temperature
drop. The device was tested in vitro in distilled water flow and blood flow at
flow rates between 0.1 ml/s and 0.45 ml/s. Both the fluids had high variances
in the temperature difference between the ambient and heater temperature. By
removing the offsets, clear trends become visible. For the distilled water tests,
a fit in the tested flow region was obtained with a coefficient of determination
of R2 = 0:9801. The blood tests however were more erratic and the best fit
that could be obtained had a coefficient of determination of R2 = 0:6056. In
both cases however, CFD results indicate that this method is a viable method
if some of the flow meter design aspects are improved.
The results indicate that a combination of the aforementioned technologies
can be used to guide a needle into a blood vessel and measure flow rate. While
further investigation is required to make this a product in the medical practice,
the investigation in this thesis serves as a basis for future clinical trials in the
development of a guidance and intra-arterial flow monitoring catheter.AFRIKAANSE OPSOMMING: Die tesis behels die ontwikkeling en toets van toestelle wat ’n naald kan lei tot in
’n bloedvat. Verder is ’n konsep vloeimeter ook ontwikkel en getoets. Dokters
beskou dit gereeld as ’n uitdaging om ’n naald in ’n bloedvat te plaas. Toegang
tot sulke bloedvate is nodig vir ’n verskeidenheid prosedures. Vir dié rede is
dit voordelig vir die mediese veld om metodes wat die proses vergemaklik te
ondersoek. Net so is die meet van bloedvloei ook belangrik in die mediese veld.
Die meet van bloedvloei na die brein kan brein ischemie voorkom, wat kan lei
tot die dood van breinweefsel.
Naby-infrarooi (NIR) lig word gebruik om die naald te lei na ’n bloedvat
toe. Twee optiese vesels is binne in die naald geplaas. Een vesel dra die NIR
lig van die lig bron af en die ander vesel lei gereflekteerde lig terug na ’n sensor
toe. Die gereflekteerde lig is verskillend vir wanneer die naald na ’n bloedvat
wys en weg van die bloedvat af wys. Die in vitro en in vivo toetse beide dui
daarop dat daar ’n statistiese beduidende (p < 0.001) verskil in gereflekteerde
lig is wanneer die naald wys na ’n bloedvat en wanneer dit weg van die bloedvat
af wys.
Elektrise impedansie word gebruik om te bepaal wanneer die naald ’n bloedvat
binnedring. ’n Sinus golf word gegenereer en deur die biologiese weefsel
gestuur. Die impedansie wat gevolglik gemeet word, is verskillend vir bloed as
vir ander weefsel soorte. Dit was gevind dat vir ’n golf van 29.85 kHz, daar ’n
statistiese beduidende verskil (p < 0.001) tussen die impedansie van bloed en
spier asook bloed en vet is.
Die vloeimeter werk met die beginsel van termiese konveksie. Die konsep
toestel wat ontwikkel is, het ’n omgewingstemperatuur sensor en a temperatuur
sensor wat in ’n verhittings spoel omvou is. Wanneer ’n vloeistof oor
die verhitter vloei, word hitte weggedra en dit veroorsaak ’n verlaging in temperatuur.
Die toestel was in vitro getoets in beide gedistilleerde watervloei
en in bloedvloei met vloei tempo’s van tussen 0.1 ml/s en 0.45 ml/s. Beide
vloeistof toetse het hoë variansies gehad tussen die omgewingstemperature en
die verhittingstemperature. Met verwydering van die relatiewe verskille tussen
datastelle, het duidelike tendense in die data verskyn. Vir die gedistilleerde
watertoetse is ’n pas gevind met ’n bepaaldheidskoëffisiënt van R2 = 0:9801.
Vir die bloedtoetse was daar slegs ’n pas gevind met ’n bepaaldheidskoëffisiënt
van R2 = 0:6056. In beide gevalle alhoewel, het CFD resultate daarop gedui
dat die metode wel ’n lewensvatbare metode is om vloei te meet, mits sekere
aspekte van die ontwerp verbeter word.
Die resultate dui aan dat ’n kombinasie van die bogenoemde tegnologieë
gebruik kan word om ’n naald te lei tot in ’n bloedvat en om vloeitempo mee te
meet. Verdere ondersoek word benodig om dié toestelle te omskep in ’n produk
wat in die mediese praktyk gebruik kan word. Nietemin dien die ondersoek wat
in dié tesis gedoen is, as ’n basis vir toekomstige kliniese ondersoeke wat kan
bydra tot die ontwikkeling van ’n leidingsnaald en intra-arteriële bloedvloei
monitor
An investigation of the determinants of estate and retirement planning in intergenerational family businesses
No full textThis study highlighted the importance of estate and retirement planning in small and medium-sized family businesses. Data from 504 questionnaires linked to 81 family businesses were collected and analysed. An Oblimin oblique rotation was performed on the principal components of the exploratory factor analysis. Five factors with eigenvalues greater than one, explaining 65.78% of the variance, were extracted. These five factors describing the theoretical dimensions of retirement planning, perceived fairness of the will, estate taxes, perceived liquidity of the business after succession and acquiring equity ownership were extracted. No practical significant differences could be found between the perceptions of male and female respondents as well as between family members involved in medium-sized or small businesses with regard to the five factors. Practical recommendations are suggested to ensure a smooth final transfer of the management and control of the business to the next generation family members.http://search.sabinet.co.za/WebZ/Authorize?sessionid=0&next=ej/ej_content_busman.html&bad=error/authofail.htm
Inleiding. In: WL van der Merwe en P Duvenage. (Reds.)
No full textPlease help us populate SUNScholar with the post print version of this article. It can be e-mailed to: [email protected] En WysbegeerteFilosofi
The impact of Blue Flag status on tourist decision-making when selecting a beach
No full textThe Blue Flag programme holds many benefits when looking from a conservation point of view, such as preserving the natural environment. But what are the benefits when looking from a tourism perspective? In the literature it is stated that a beach’s Blue Flag status has little to no impact on the decision making of visitors when selecting a beach at which to spend their holiday. The aim of this article is to determine the impact of Blue Flag status on visitors’ decision-making when selecting a beach. Probability sampling was used with systematic sampling methods. A survey was conducted from between March and April, 2013 at six beaches across the Margate area. A total of 572 usable questionnaires were collected. The results showed whether or not a beach has Blue Flag status has little influence on the decision-making of beach visitors as little difference was found between the decision-making aspects of Blue Flag and non-Blue Flag beach visitors. It was noted that aspects of importance for decision-making for both groups of visitors form mostly part of the criteria set by the Blue Flag programme.
This article makes three main contributions to the current literature; firstly, new information was identified regarding the role of the Blue Flag programme and what visitors are looking for when selecting a beach. Secondly, important aspects considered by visitors selecting a beach, such as cleanliness, landscape and popularity are identified. Lastly, this was the first time such research was conducted within a South African setting.http://www.ajhtl.com
sj-docx-1-ics-10.1177_13678779221090986 - Supplemental material for Brothers from another mother: Seeing the uncanny in US popular media depictions of South Africa
No full textSupplemental material, sj-docx-1-ics-10.1177_13678779221090986 for Brothers from another mother: Seeing the uncanny in US popular media depictions of South Africa by Rachel Lara van der Merwe in International Journal of Cultural Studies</p
Factors influencing a memorable game viewing experience
No full textNot on Sherpa or Masterfile. On journal website it says: This is an open-access journal - free use, distribution, and reproduction in any medium is allowed, provided that the journal, and original author/s are credited.One of the most important aspects in selling tourism products is to provide tourists with a memorable experience. In the case of South Africa, most of the tourism product offerings are nature or wildlife based, with South African National Parks as one of the biggest contributors to the wildlife tourism product offering. The two most preferred methods to engage with wildlife is self-drive game viewing and making use of operators in safari vehicles for guided game viewing. The purpose of this article is therefore to determine which factors determine a memorable game viewing experience in each of the abovementioned options, namely self-drive and guided viewing. A quantitative research method was used by means of a web-based survey.
The survey was posted on the official website of South African National Parks. A total of 387 usable questionnaires were received back during this time frame. The results indicated that wildlife ambiance and interpretation are fundamental in having a memorable game viewing experience for self-drive game viewing and guided game viewing in safari vehicles, respectively. This article makes two main contributions to the current literature: Firstly, it has found that national park management do have limited control over some factors (for example species variety, species numbers and infrastructure) which require good management in order to provide tourists with a memorable experience; and secondly, it is the first time that memorable wildlife experience has been determined concerning land-based wildlife and within South African National Parks.http://www.ajhtl.com/uploads/7/1/6/3/7163688/article_7_vol._3_2_july.pd
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