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Search Results: 1 - 10 of 179857 matches for " Alan de Klerk "
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Heat and Moisture Exchangers and Humidification Efficacy in Pediatrics: Effects of Ventilator Settings and ETT Leakage
Alan de Klerk,Antonio M. Esquinas
Critical Care Research and Practice , 2012, DOI: 10.1155/2012/585280
Heat and Moisture Exchangers and Humidification Efficacy in Pediatrics: Effects of Ventilator Settings and ETT Leakage
Alan de Klerk,Antonio M. Esquinas
Critical Care Research and Practice , 2012, DOI: 10.1155/2012/585280
Macroinvertebrate Assemblage Changes as an Indicator of Water Quality of Perennial Endorheic Reed Pans on the Mpumalanga Highveld, South Africa  [PDF]
Arno R. de Klerk, Victor Wepener
Journal of Environmental Protection (JEP) , 2013, DOI: 10.4236/jep.2013.47A002

Reed pans are a very uncommon type of endorheic wetland, and as such the amount of information available is very limited. Thus, they are being impacted on by various agricultural, livestock and other anthropogenic activities. The objectives of this study were to determine the spatial and temporal variations of macroinvertebrate community structures in reed pans and the environmental factors (i.e., water quality) responsible for the maintenance of these structures. Reed pans were studied over four different seasons, during which time subsurface water, sediment and macroinvertebrate samples were collected and analyzed. The reed pans studied showed that the macroinvertebrates were able to reflect various changes in reed pans with regard to seasonal variability and anthropogenic impacts on water quality. These anthropogenic impacts caused the disappearance of sensitive macroinvertebrate taxa and the increase of tolerant macroinvertebrate taxa.

Clinical review: Humidifiers during non-invasive ventilation - key topics and practical implications
Antonio M Esquinas Rodriguez, Raffaele Scala, Arie Soroksky, Ahmed BaHammam, Alan de Klerk, Arschang Valipour, Davide Chiumello, Claude Martin, Anne E Holland
Critical Care , 2012, DOI: 10.1186/cc10534
Abstract: The human airway has an important role in heating and humidifying inspired gas, and recovering heat and moisture from expired gas. The amount of water vapor in a gas mixture can be measured as absolute humidity (AH) or relative humidity (RH) in relation to the temperature. AH is the total water present in the gas (mg H2O/L) and RH is the amount of water present expressed as the percentage of maximum carrying capacity at a given temperature [1]. The human airway must provide gas at core temperature and 100% RH at the alveolar surface in order to optimize gas exchange and protect lung tissue [2].Non-invasive ventilation (NIV) is a mechanical ventilation modality that does not utilize an invasive artificial airway (endotracheal tube or tracheostomy tube) [3]. NIV is usually delivered through a nasal or oro-nasal mask so the inspired gas passes through the upper airway where it is conditioned. Like during spontaneous breathing, patients under NIV require adequate humidification and heating of the inspired air (that is, gas conditioning) [3]. NIV delivers inspired air at high flow rates, which may overwhelm the usual airway humidification mechanisms. Inadequate gas conditioning has been associated with anatomical and functional deterioration of nasal mucosa (ciliary activity, mucus secretion, local blood flow, nasal resistance). In addition, there are also negative effects on tolerance to NIV when a patient breathes inadequately humidified air [1,3-5] (Table 1).Metaplastic changes and keratinization of the nasal epithelium and submucosa have been reported in patients on home-NIV when the level of humidification was inadequate for long periods [5]. These histopathological findings were confirmed by our recent survey, which found similar structural changes of the nasal mucosa in four patients with acute respiratory failure treated for 7 days with NIV without a humidification system added (unpublished data; Figure 1). This suggests that changes in the nasal mucosa occur rel
Die Nagmaal en broodgebrek
BJ de Klerk
HTS Theological Studies/Teologiese Studies , 2007,
Abstract: In Africa one out of three people suffers from undernourishment or malnutrition. In this respect the topical question whether Holy Communion and acts of charity to those who suffer from hunger can be linked. Jesus not only endows Holy Communion with a personal dimension of faith, but also foregrounds this aspect in the care for those who suffer from hunger. New Testament material reveals that in the congregation of Jerusalem partaking of Holy Communion developed into mutual diaconal care. It is thus for this reason inter alia that Paul warns against misusing Holy Communion. This kind of misuse was evident because the rich partook of Christ's meal of love without realising that they could only be part of this act of love by bestowing love themselves. In this article some practical guidelines to link the celebration of Holy Communion and the crisis of want of bread are discussed. HTS Theological Studies Vol. 63 (2) 2007: pp. 605-624
The human genome project in clinical perspective: The emperor’s new clothes?
R de Klerk
Continuing Medical Education , 2005,
Liturgiese afleidings uit die kontinu teit en diskontinu teit van die pasga en die nagmaal
B de Klerk
Acta Theologica , 2011,
Abstract: Liturgical deductions based on the continuity and discontinuity of Passover Holy Communion The Service of the Word constitutes the climax and junction of the liturgy during the service, and the Communion is the crucial confirmation and appropriation of the core of Scripture, namely Jesus Christ as Lord and Saviour. The question is whether liturgic deductions for the purpose of enriching the celebration of the Holy Communion can result from a consideration of the continuity and the discontinuity of Passover and the Communion of our Lord. A literature study was employed in the investigation of this question. Passover is probably the one Old Testamentical festival that is of importance for research regarding the Holy Communion, precisely because Jesus consciously chose the time of Passover to instate the Communion. Liturgical deductions are amongst other things made regarding both festivals as celebration of the great acts of redemption in history, the eating of bread and the drinking of wine during both festivals, the eschatological elements in both festivals and the elements of commemoration, proclamation and expectation in both festivals. In each instance the continuity and discontinuity are considered as well. Article text in Afrikaans
‘n Sosiaal-sielkundige en kognitiewe benadering tot die ontwikkeling van ‘n kledingverbruikersbesluitnemingsmodel
HM de Klerk
Journal of Family Ecology and Consumer Sciences /Tydskrif vir Gesinsekologie en Verbruikerswetenskappe , 1999,
Abstract: Many academics and researchers underline the fact that textile training and research in merchandising do not emphasise the theory enough. This may partly be because retailing and marketing, and consumer education as applied fields, have not stressed basic theory in recent years. The role theory can play in solving practical problems has also been misunderstood. Merchandising and consumer education researchers have to collect and organise their own theory base. This theory base should incorporate root disciplines in the social sciences plus major contributions from marketing and business management, other fields of home economics, and in this case various textile and clothing areas. The choice of a new product requires decisions by the consumer. According to clothing theorists and researchers in clothing consumer education, these decisions are usually made in the clothing store at the point of purchase. The decision-making process consists of five stages, namely the awareness stage, the interest stage, the evaluation stage, the trail stage and the adoption stage. Clothing research indicates that clothing consumers seek information, compare alternative choices and make decisions at the point of purchase. It is important to know what information the clothing consumer seeks and uses in coming to a decision. It is also important to know what types of information are utilised by different consumer target groups. Researchers and academics should be aware of different patterns of seeking information, based on lifestyles, psychological characteristics and cognitive ability in the target groups. This information should be integrated and combined with the basic theory from related fields to develop a social-psychological and cognitive clothing consumer decision-making model to be used by academics and researchers in clothing consumer education programmes. In the field of clothing, the symbolic interactionism and a cognitive perspective have been successfully combined with theory in the fields of consumer behaviour to address a wide variety aspects, influences and problems in the field of clothing consumer education and in clothing consumer research. All the data should be integrated into a social-psychological and cognitive framework for clothing consumer decision making.
Afrikaners en Nederlanders: stamverwante?
P. de Klerk
Koers : Bulletin for Christian Scholarship , 1998, DOI: 10.4102/koers.v63i4.538
Abstract: Are the Afrikaners kinsmen of the Dutch? In some recent publications the Afrikaners and the Dutch have been referred to as each other's cousins, kinsmen or relatives. Other authors, however, consider the concept of “stamverwantskap" (which can be translated as tribal affiliation or as membership of a family of nations) to be outdated and incorrect. This article briefly examines the development of the idea of "stamverwantskap” between Dutchmen, Flemings and Afrikaners and points out that this idea forms part of nineteenth-century nationalist thought. It is especially linked to the view that nations have characteristics which are similar to those of living organisms. Furthermore, the idea of kinship between the Afrikaners and the Dutch developed within the pan-Dutch movement, which had imperialist aims. It is concluded that the idea of "stamverwantskap" is incompatible with a Christian view of history and society. While the present trend is to regard all mother-tongue speakers of Afrikaans as Afrikaners, the idea of kinship is a hindrance rather than a help in the development of cultural relations between the Afrikaners and the Dutch.
F. De Klerk
South African Journal of Industrial Engineering , 2012,
Abstract: ENGLISH ABSTRACT: A big passenger transport company experienced problems with the utilization of their maintenance crews. Large amounts of overtime were logged, while at the same time a lot of idle time was experienced. This paper describes the development on a microcomputer of a Decision Support System (DSS) to improve their shift scheduling. Central to the DSS is a heuristic algorithm which generates shift schedules. This algorithm is easy .to understand and provides good results, while it solves the real life problem rapidly on a microcomputer. AFRIKAANSE OPSOMMING: 'n Groot passasiersvervoermaatokappy het probleme ondervind met die benutting van hulle onderhoudspersoneel. Baie oortyd is gewerk en terselfdertyd is baie ledige tyd opgeteken. Hierdie artikel beskryf die ontwikkeling op 'n mikrorekenaar van 'n Besluitnemingsondersteuningstelsel (BOS) om hulle skofteskedulering te verbeter. Die belangrikste element van die BOS is 'n heuristiese algoritme wat skofteskedules genereer. Hierdie algoritme is maklik om te verstaan en genereer goeie skedules. Terselfdertyd los dit die maatskappy se probleem vinnig op 'n mikrorekenaar op.
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