oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 95 )

2018 ( 571 )

2017 ( 560 )

2016 ( 788 )

Custom range...

Search Results: 1 - 10 of 456735 matches for " J.G. Van der Walt "
All listed articles are free for downloading (OA Articles)
Page 1 /456735
Display every page Item
LIMITED RUN PRODUCTION USING ALUMIDE TOOLING FOR THE PLASTIC INJECTION MOULDING PROCESS#1
J. Combrinck,G.J. Booysen,J.G. Van der Walt,D.J. De Beer
South African Journal of Industrial Engineering , 2012,
Abstract: ENGLISH ABSTRACT: Existing techniques for the production of conventional steel tooling for plastic injection moulding are expensive and time-consuming. As a result, many new products often do not advance beyond the prototype stage. This paper describes an investigation into the possibility of using laser sintered Alumide (an aluminium-filled nylon material) in a novel alternative process for producing hybrid rapid tooling tools. Initial experiments performed by researchers at the Central University of Technology have shown excellent results. An Alumide tool can be manufactured in a shorter time and at a significantly lower cost than the same size direct metal laser sintered tool. AFRIKAANSE OPSOMMING: Bestaande tegnieke vir die vervaardiging van konvensionele staal gietstukke vir die plastiek spuit-giet proses is duur en tydrowend. Die gevolg hiervan is dat baie nuwe produkte nie verder as die prototipe stadium vorder nie. Hierdie artikel ondersoek die moontlikheid om laser gesinterde Alumide (aluminium gevulde nylon materiaal) in ’n nuwe benadering as ’n alternatiewe proses vir die vervaardiging van snel hibried-gietvorms te gebruik. Aanvanklike eksperimente uitgevoer deur navorsers aan die Sentrale Universiteit vir Tegnologie het uitstekende resultate gelewer. ’n Alumide gietvorm kan vinniger en goedkoper vervaardig word as dieselfde grootte direk metaal gesinterde gietvorm.
Ovine Hepatic Metabolism. II. The Effect of Osmolarity and Ph of the Perfusion Medium on Hepatic Uptake of Ammonia and Nitrogen Excretion
A.M. Ali,H.E. Mohamed,J.G. van der Walt,H.C. Rossouw,H. Engelbrecht
Journal of Animal and Veterinary Advances , 2012,
Abstract: The present investigation was carried out to assess the influence of changing perfusion medium osmolarity and pH with or without additional amino acid on the hepatic uptake of ammonia and production of urea and glutamine. To elucidate this effect, the caudal liver lobes of twenty Merino sheep (24-35 kg) were perfused using a non-reticulating perfusion model for 3-4 h using Krebs-Henseliet buffer solution containing 2.1 mM lactate, 0.3 mM pyruvate, 10 IU heparin m 1 at 37 C and gassed with O2-CO2 (95:5 v/v). An increase of perfusion osmolarity from 300 mosmol L 1 to 330 mosmol L 1 resulted in an increase in hepatic uptake of ammonia from 1200-nmol g 1 min 1 to 1900 nmol g min 1, thus assisting the hepatic clearance of ammonia. Similarly, hepatic glutamine production rosed from 48 to 177 nmol g 1 min 1. As the influent pH rose, a decline in urea and glutamine production was observed. The additions of amino acids favour glutamine hepatic uptake rather than production.
Ovine Hepatic Metabolism 1. The Effect of Portal Amino Acid Concentration on the Metabolism of Glucose and Urea
A.M Ali,H.E. Mohamed,van der Walt J.G.,H.C. Rossouw,H. Engelbrecht
Journal of Animal and Veterinary Advances , 2012,
Abstract: The study was designed to address the hepatic response (urea and glucose production, glycogen synthesis, and oxygen consumption) to physiological changes in Amino Acid (AA) concentrations. To elucidate this objective, Four South African Mutton Merino Wethers weighing 23-33 Kg were used and the caudate lobe of the liver of mean weight 18.70?1.5 g was perfused with modified Krebs-Henseleit medium. Mixtures of amino acids representing Low Nitrogen (LN), High Nitrogen (HN = 3 X LN) and LN or HN plus either extra alanine, lysine, or glutamine, were perfused at a flow rate ranging from 65-100 ml/min. The data indicates an increase in hepatic urea production and a 20-240% decrease in glucose production in response to high amino acid mixture. The inhibition of glucose production was inhibited by 22% for the HN infusion and further 20% by added alanine, lysine or glutamine. However, the addition of amino acid did not affect urea production and the oxygen consumption.
What happens when one picks up the Greek text?
J.G. Van der Watt
Acta Theologica , 2002,
Abstract: A few issues of hermeneutic nature related to Bible translation are considered. It is argued that the chosen philosophical framework (for instance, a modernist or postmodern approach) determines the way in which any process of translation is approached. Attention then shifts to some of the presuppositions and assumptions of literal translations. These presuppositions are discussed critically. Another factor determining the nature of a translation is the intended function of that particular translation. If, for instance, the intended function is to be understandable for ordinary, present-day readers, a meaning-orientated translation would be preferable. Lastly, the role of interpretation in the translation process is considered. The assumption that no interpretation takes place in the case of word-for word translations is critiqued. (Acta Theologica, Supplementum 2, 2002: 246-265)
The Gospel of John’s perception of ethical behaviour
J.G. van der Watt
In die Skriflig , 2011, DOI: 10.4102/ids.v45i2&3.22
Abstract: Johannine ethics have proven to be a problematic and challenging area of research. In this article the way in which the author of the Gospel of John defines ethical actions are explored. What does he describe as the works of God and what is really good, according to him? The conclusion is that the analytical categories for treating the ethics in the Gospel of John should be broadened.
Some considerations on Bible translation as complex process
J.G. Van der Watt, Y. Kruger
Acta Theologica , 2002,
Abstract: It is argued that translation is a complex process: meaning is "created" by decoding the source text on several levels (for instance, grammatical; structural; literary; and socio-cultural levels). This "meaning" must then be encoded into the target language by means of the linguistic, literary, and cultural conventions of the target language. These different aspects (grammar, structure, etc.) combine in an interactive process and result in meaning. Atomisation or compartmentalisation of the various aspects distorts communication. It is also argued that it should be assumed that what can be said in one language can be said in (translated into) another language, but not necessarily by combining the relevant linguistic, literary and cultural aspects in the target language in the same way as they were combined in the source language. This is because languages do not overlap in their use of words, structures, genres, and social conventions. This inevitably leads to the realisation that a translation could and would never be an exact "copy" of the original. (Acta Theologica, Supplementum 2, 2002: 118-139)
Three case studies involving Leptospira interrogans serovar pomona infection in mixed farming units : case report
B. Gummow,J.G. Myburgh,P.N. Thompson,J.J. Van der Lugt
Journal of the South African Veterinary Association , 2012, DOI: 10.4102/jsava.v70i1.747
Abstract: Three case studies involving Leptospira interrogans serovar pomona outbreaks within mixed farming systems in South Africa are described. On 2 farms, pigs constituted the main enterprise with cattle and sheep of secondary importance. On each of these 2 farms, abortion due to L. pomona in sows was confirmed by culture, and antibody titres to pomona were detected in cattle, sheep, horses and dogs. On the 3rd farm, a piggery was ofsecondary importance to cattle farming. Abortion and death in cows occurred on this farmand serology showed titres to various serovars, including pomona. L. pomona was also isolated from bovine urine, an aborted bovine foetus and kidneys from slaughtered pigs. This particular case study was regarded as clinically atypical in that adult Jersey cattle died of acute leptospirosis in a semiarid region of South Africa. In all 3 case studies, the poor management of pig effluent and of the drinking water and its sources played a pivotal role in the transmission of the disease. Inadequate vaccination of animals against Leptospira and poor record-keeping within the secondary farming enterprises were also contributing factors to the spread of leptospirosis.
The breed prevalence of Dog Erythrocyte Antigen 1.1 in the Onderstepoort area of South Africa and its significance in selection of canine blood donors
L.L. Van der Merwe,L.S. Jacobson,J.G. Pretorius
Journal of the South African Veterinary Association , 2012, DOI: 10.4102/jsava.v73i2.555
Abstract: The blood group antigen Dog Erythrocyte Antigen (DEA) 1.1 is clinically the most important canine blood group as DEA 1.1 antibodies are capable of causing acute haemolytic, potentially life-threatening transfusion reactions. Dogs do not have naturally occurring antibodies to DEA 1.1 but are rapidly sensitised by the first incompatible transfusion. The prevalence of DEA 1.1 in the general dog population is estimated at 42-46 %. Canine blood donors registered with the Onderstepoort Animal Blood Bank (n = 93) as well as potential donors (n = 140) were typed for DEA 1.1 using a monoclonal antibody card kit. All dogs came from the Onderstepoort area, near Pretoria, Gauteng province, South Africa. Overall prevalence of DEA 1.1 was 47 %. Prevalence was 47 % in purebred dogs and 48 % in mongrels. Distinct breed differences were noted with less than 20 % of German shepherd dogs and Boxers and greater than 75 % of Rottweilers, Great Danes, St Bernards and Dalmations testing DEA 1.1 positive. Knowledge of local breed differences will increase effectiveness of blood donor recruitment.
Die godsdiensneutraliteitsbeginsel van die Amerikaanse demokrasie - implikasie vir onderwys in die RSA
J.G. van Staden
Koers : Bulletin for Christian Scholarship , 1995, DOI: 10.4102/koers.v60i3.641
Abstract: The principle of religious neutrality in the American democracy - implications for education in the RSA In a changing, democratic educational dispensation the accommodation of various religious convictions and religious needs of the heterogenous South African population is a matter that has to be dealt with with great circumspection. Valuable lessons that can prevent distress and disruption may be learnt from the way in which the American hyper-democracy has handled the situation. Democracy is the American's predominant pre-occupation. Any attempt of any group (e.g. a religious group) to grant a monopoly in state schools to religious values in special learning content and religious ceremonies and practices has always been opposed. This approach has eventually led to total neutrality as regards traditional religious convictions and practices in American state schools, resulting in the establishment of another conviction (secular humanism) in state schools. Thus it seems that neutrality as regards religious convictions is not possible. Absolutism of the principle of neutrality as regards traditional religions has resulted in a degeneration of moral values. If all the religious convictions cannot be accommodated in the South African public education system, it may for South Africa, as bastion of Christian civilization, be a danger sign as has been the case in the USA.
Laparoscopic versus open transhiatal esophagectomy for distal and junction cancer
Maas,Kirsten W.; Biere,Surya S.A.Y.; Scheepers,Joris J.G.; Gisbertz,Suzanne S.; van der Peet,Donald L.; Cuesta,Miguel A.;
Revista Espa?ola de Enfermedades Digestivas , 2012, DOI: 10.4321/S1130-01082012000400005
Abstract: background: the only curative treatment for esophageal cancer is surgical resection. this treatment is associated with a high morbidity rate and long in-hospital recovery period. both transthoracic and transhiatal esophagectomies are performed worldwide. the transhiatal approach may reduce the respiratory infection rate in compromised patients with distal esophageal and gastro-esophageal (ge) cancers. minimally invasive esophagectomy could further improve post-operative outcome. two cohorts of laparoscopic and open transhiatal esophagectomy for cancer were compared for short- and long-term outcome. methods: from january 2001 through december 2004, 50 patients who underwent laparoscopic transhiatal esophagectomy were compared to a historical group of 50 patients who had undergone open transhiatal esophagectomy between january 1998 and december 2000. post-operative management was identical in both groups. results: no significant differences were seen between the two groups with regard to baseline characteristics and oncological parameters including resection margin (r0 82 vs. 74%, p = 0.334) and 5-year survival. operation time did not differ significantly between the groups. (300 vs. 280 min, p = 0.110). median hospital stay and intensive care unit stay were significantly shorter in the laparoscopic group (13 vs. 16 days, p = 0.001 and 1 vs. 3 days, p = 0.000 respectively). conclusion: minimally invasive transhiatal esophagectomy is feasible and has the same oncological outcome as open transhiatal esophagectomy. faster recovery without a significant longer operation time could be the major benefit of the laparoscopic transhiatal approach. to our knowledge, this is the largest comparative study in literature comparing laparoscopic transhiatal with open transhiatal esophagectomy for cancers of distal and ge junction. randomized trials are needed to further clarify the role of laparoscopic transhiatal approach for esophageal cancer.
Page 1 /456735
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.