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Search Results: 1 - 10 of 577215 matches for " D.J. De Beer "
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PHYSICAL MODELLING OF TERRAIN DIRECTLY FROM SURFER GRID AND ARC/INFO ASCII DATA FORMATS#
Y.K. Modi,D.J. De Beer,S. Agrawal
South African Journal of Industrial Engineering , 2012,
Abstract: ENGLISH ABSTRACT: Additive manufacturing technology is used to make physical models of terrain using GIS surface data. Attempts have been made to understand several other GIS file formats, such as the Surfer grid and the ARC/INFO ASCII grid. The surface of the terrain in these file formats has been converted into an STL file format that is suitable for additive manufacturing. The STL surface is converted into a 3D model by making the walls and the base. In this paper, the terrain modelling work has been extended to several other widely-used GIS file formats. Terrain models can be created in less time and at less cost, and intricate geometries of terrain can be created with ease and great accuracy. AFRIKAANSE OPSOMMING: Laagvervaardigingstegnologie word gebruik om fisiese modelle van terreine vanaf GIS oppervlakdata te maak. Daar is gepoog om verskeie ander GIS lêerformate, soos die Surfer rooster en die ARC/INFO ASCII rooster, te verstaan. Die oppervlak van die terrein in hierdie lêerformate is omgeskakel in 'n STL lêerformaat wat geskik is vir laagvervaardiging. Verder is die STL oppervlak omgeskakel in 'n 3D model deur die kante en die basis te modelleer. In hierdie artikel is die terreinmodelleringswerk uitgebrei na verskeie ander algemeen gebruikte GIS lêerformate. Terreinmodelle kan so geskep word in korter tyd en teen laer koste, terwyl komplekse geometrie van terreine met gemak en groot akkuraatheid geskep kan word.
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.
An annotated check list of the birds of Qwaqwa National Park
D.H. De Swardt,D.J. van Niekerk
Koedoe : African Protected Area Conservation and Science , 1996, DOI: 10.4102/koedoe.v39i1.285
Abstract: This paper presents a check list of 179 bird species occuring in the Qwaqwa National Park which borders the eastern part of Golden Gate Highlands National Park. Data on the distribution, status, habitat preferences and breeding were obtained during several visits between December 1992 and March 1995. The following habitats were preferred: grassland, montane grassland, woodland, rocky hillsides, mountain slopes and riverine areas with Phragmites reedbeds. The conservation of waterbirds, raptors and other localised species such as Orangebreasted Rockjumper, Palecrowned Cisticola, Mountain Pipit and Gurney's Sugarbird is important as these species occur in specialised habitats.
Relaxa??o Lagrangiana aplicada ao problema de dimensionamento de lotes em máquinas paralelas: limitantes inferiores
Fiorotto, D.J.;Araujo, S.A. de;
TEMA (S?o Carlos) , 2012, DOI: 10.5540/tema.2012.013.01.0013
Abstract: this paper addresses the single stage lot-sizing problem in parallel machines. each item can be produced on any machine, and incurs a setup time before to start the production. the objective of this paper is to obtain lower bounds of good quality for this problem. a solution method is developed based on a reformulation of the problem and the lagrangian relaxation of a set of constraints. some computational results are presented comparing the proposed method with a method from the literature and with a computational package.
The Concept of "Simultaneous Feedback": Towards a New Methodology for Compiling Dictionaries
Gilles-Maurice de Schryver,D.J. Prinsloo
Lexikos , 2011, DOI: 10.5788/10--885
Abstract: : Good lexicographers are constantly striving to enhance the quality of their dictionaries. Since dictionaries are ultimately judged by their target users, there is an urgency to provide for the target users' needs. In order to determine such needs more accurately, it has become common practice to submit users of a dictionary to a series of tests to monitor their success in information rehieval. In most cases such feedback unfortunately comes too late so that it can at best be considered for. implementation in the next or revised edition of the dictionary. In this article it is argued that feedback from the target users should be obtained while the compilation of the dictionary is still in progress, a process referred to as "simultaneous feedback". This concept, which offers a new methodology for compiling dictionaries, overcomes the major problem 'of creating and publishing entire dictionaries before feedback from target users can be obtained. By this new methodology, the release of several small-scale parallel dictionaries triggers feedback that is immediately channelled to the compilation process of a main dictionary. As such, the target users constantly guide the compilers during the entire compilation process. After a theoretical presentation of the new concept, the feasibility of simultaneous feedback is illustrated with reference to the creation of a bilingual CiIuba-Dutch leamer's dictionary. It is shown how this main project has been successfully complemented by three parallel projects. Keywords: SIMULTANEOUS FEEDBACK, NEW METHOOOLOGY, MAIN DICTIONARY, PARALLEL DICTIONARIES, TARGET USERS' DESIRES, QUESTIONNAIRES, ELECTRONIC CORPORA, WORD-FREQUENCY STUDIES, CONCORDANCES, AFRICAN LANGUAGES, CILUBà Opsomming: Die konsep van "gelyktydige terugvoering": Onderweg na Innuwe metodologie vir die samestelling van. woordeboeke. Goeie leksikograwestreef voortdurend daama om die gehalte van hul woordeboeke te verbeter. Aangesien woordeboeke uiteindelik deur hul teikengebruikers beoordeel word, is dit uiters noodsaaklik dat aangebruikersbehoeftes voldoen moet word. Ten einde sodanige behoeftes noukeuriger te kan bepaal, ,is dit algemeen gebruiklik dat woordeboekgebruikers aan 'n reeks toetse onderwerp word teneinde hulle sukses ten opsigte van inligtingsinwinning te kan bepaal. Ongelukkig kom sodanigeterugvoer in die meeste gevalle te laat deurdat dit slegs in die volgende of hersiene uitgawe van die~oordeboek in berekening gebring kan word. In hierdie artikel word betoog dat terugvoeringvanaf die teikengebruikers verkry moet word terwyl die sames telling van
Sobre el único ejemplar latinoamericano de la primera edición de De revolutionibus orbium caelestium de Copérnico, en Guadalajara, Jalisco, México
S. Galindo,D.J. de Alba Martínez
Revista mexicana de física E , 2012,
Abstract: La Biblioteca Pública "Juan José Arreola" del estado de Jalisco dependiente de la Universidad de Guadalajara, tiene en su custodia el único ejemplar hasta ahora localizado en Latinoamérica, de la primera edición (1543) del De revolutionibus orbium caelestíum de Nicolás Copérnico. El presente artículo da a conocer algunos detalles preliminares relacionados con dicho ejemplar. The "Juan José Arreola" Jalisco's Public Library at the Universidad de Guadalajara treasures the only surviving first edition copy (1543) in Latin America of Nicholas Copernicus's De revolutionibus orbium calestium. The present work gives some preliminary details related to the mentioned copy.
Loan Words versus Indigenous Words in Northern Sotho - A Lexicographic Perspective *
Salmina Nong,Gilles-Maurice de Schryver,D.J. Prinsloo
Lexikos , 2011, DOI: 10.5788/12--758
Abstract: : The aim of this article is to investigate, from a lexicographic perspective, the preferences of Northern Sotho mother-tongue speakers for loan words versus so-called 'traditional' or 'original' counterparts in the language. Results obtained from a survey conducted among 100 randomly selected mother-tongue speakers from different age and gender groups, backgrounds, places of residence, etc. will be analysed. It is shown that although the overwhelming preference of the respondents lies with the use of (more) indigenous words in comparison to loan words, lexicographers should be alerted to possible, even rapid, changes in this preference pattern. The results from the survey are compared throughout with frequency counts derived from a corpus as well as with current dictionary treatment. Keywords: LEXICOGRAPHY, DICTIONARY, LEMMATISATION, NORTHERN SOTHO (SEPEDI), LOAN WORD, SOTHOISED WORD, INDIGENOUS WORD, QUESTIONNAIRE, CORPUS, DESCRIPTIVENESS, PROSCRIPTIVENESS, PRESCRIPTIVENESS, PREFERENCE PATTERN Senaganwa: Maadingwa ge a bapet wa le Mant u a Setlogo go Sesotho saLeboa — Kgopolo ya Bangwalapukunt u. Maikemi et o a taodi wana ye ke gonyaki i a, go ya ka kgopolo ya bangwalapukunt u, ka fao baboledi ba Sesotho sa Leboa ba diragokgetho ya mant u magareng ga maadingwa le mant u a setlogo polelong ye. Dipoelo t e dihwedit wego go t wa go bakgathatema ba e lego baboledi ba Sesotho sa Leboa, banna le basadi, balekgolo (100) ba mengwaga ya go fapana, maemo a a fapanego a thuto, ba ba dulago mafelong ao afapafapanego, bj.bj. di tla fetlekwa. Go ipont ha gore le ge dipoelo t a nyaki i o ye di laet a gorebont i bja bakgathatema bo kgetha go omi a mant u a setlogo go ena le maadingwa, bangwadi ba dipukunt u ba swanet e go phafo wa mabapi le diphetogo t e di ka bago gona pateroneng yakgetho ya t homi o ya mant u. Dipoelo t a nyaki i o ye di bapet wa le ka moo mant u a t welelagokgafet akgafet a go t wa khophaseng gammogo le ka fao dipukunt u t e di et ego di le gonadi omi it ego mant u ao ka gona. Mant u a bohlokwa: GO HLAMA PUKUNT U, PUKUNT U, TSELA YA GO NGWALAMANT U KA PUKUNT UNG, SESOTHO SA LEBOA (SEPEDI), LEADINGWA, LENT U LE LESOTHOFADIT WEGO, LENT U LA SETLOGO, LENANEOPOT I O, KHOPHASE, GOHLALO A POLELO, GO HLALO A POLELO KA GO FA KGETHO, GO LAELA KA GAT HOMI O YA POLELO, PATERONE YA KGETHO YA MANT U
Eliminación de Bandas Calientes en Reformador de Gas Natural
Correa,D.J.;
Información tecnológica , 2004, DOI: 10.4067/S0718-07642004000300015
Abstract: the purpose of this study was to find the causes of formation of hot bands due to coke deposition in a natural gas reformer which caused the unit to go out of service, resulting in higher production costs. a literature study was made to determine the variables which affected the incidence of this problem, and to produce an index which quantified the formation of coke, named obstruction index. the impact of different variables was systematically analyzed and these variables were related to the evolution of the obstruction index, always taking into account the information from the industrial plant studied. all hypotheses were discarded except that relating to the presence of light hydrocarbons. it was determined that the problem of the hot bands did not originate within the reforming unit, but rather upstream of the process in the desulfurization unit
Towards understanding the kallikrein-kinin system: insights from measurement of kinin peptides
Campbell, D.J.;
Brazilian Journal of Medical and Biological Research , 2000, DOI: 10.1590/S0100-879X2000000600008
Abstract: the kallikrein-kinin system is complex, with several bioactive peptides that are formed in many different compartments. kinin peptides are implicated in many physiological and pathological processes including the regulation of blood pressure and sodium homeostasis, inflammatory processes, and the cardioprotective effects of preconditioning. we established a methodology for the measurement of individual kinin peptides in order to study the function of the kallikrein-kinin system. the levels of kinin peptides in tissues were higher than in blood, confirming the primary tissue localization of the kallikrein-kinin system. moreover, the separate measurement of bradykinin and kallidin peptides in man demonstrated the differential regulation of the plasma and tissue kallikrein-kinin systems, respectively. kinin peptide levels were increased in the heart of rats with myocardial infarction, in tissues of diabetic and spontaneously hypertensive rats, and in urine of patients with interstitial cystitis, suggesting a role for kinin peptides in the pathogenesis of these conditions. by contrast, blood levels of kallidin, but not bradykinin, peptides were suppressed in patients with severe cardiac failure, suggesting that the activity of the tissue kallikrein-kinin system may be suppressed in this condition. both angiotensin converting enzyme (ace) and neutral endopeptidase (nep) inhibitors increased bradykinin peptide levels. ace and nep inhibitors had different effects on kinin peptide levels in blood, urine, and tissues, which may be accounted for by the differential contributions of ace and nep to kinin peptide metabolism in the multiple compartments in which kinin peptide generation occurs. measurement of the levels of individual kinin peptides has given important information about the operation of the kallikrein-kinin system and its role in physiology and disease states.
Religieuse pluraiteit en waarheid: die hoofstroom christelike respons
D.J Louw
Acta Theologica , 2005,
Abstract: Ons kleiner wordende wêreld konfronteer ons met ’n pluraliteit van godsdienste en ’n daarmee korrelerende pluraliteit van aansprake op “waarheid”. Hoe moet ons hierdie aansprake evalueer? Die antwoord wat die meeste Christene op hierdie vraag gee, ossilleer tussen eksklusivisme en inklusivisme. Hierdie standpunte word krities bespreek aan die hand van Karl Barth (konserwatiewe eksklusivisme), Hendrik Kraemer en Emil Brunner (liberale eksklusivisme) en Karl Rahner (inklusivisme). Daar word tot die slotsom gekom dat die standpunte van sowel die eksklusivis as die inklusivis uiteindelik mank gaan aan die subjektiewe willekeur wat hulle juis wou vermy.
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