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Search Results: 1 - 10 of 297498 matches for " Barend J. Thijsse "
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A Current Induced Transition in atomic-sized contacts of metallic Alloys
Jan W. T. Heemskerk,Yves Noat,David J. Bakker,Jan M. van Ruitenbeek,Barend J. Thijsse,Peter Klaver
Physics , 2002, DOI: 10.1103/PhysRevB.67.115416
Abstract: We have measured conductance histograms of atomic point contacts made from the noble-transition metal alloys CuNi, AgPd, and AuPt for a concentration ratio of 1:1. For all alloys these histograms at low bias voltage (below 300 mV) resemble those of the noble metals whereas at high bias (above 300 mV) they resemble those of the transition metals. We interpret this effect as a change in the composition of the point contact with bias voltage. We discuss possible explanations in terms of electromigration and differential diffusion induced by current heating.
Liturgical guidelines for congregations to have a voice in the serious problem of economical inequality in South Africa
Barend J. de Klerk
In die Skriflig , 2013, DOI: http://dx.doi.org/10.4102/ ids.v47i1.683
Abstract: It is part of the calling of the church to address issues of justice and peace, and to care for the poor and the marginalised in society, because the church is the body of Christ and therefore the heart and hands of Christ in this world. In this article, the problem statement is: ‘How can liturgical guidelines help churches to become involved in the economic inequality and the consequent poverty in our society?’ Richard Osmer articulates a practical theological method that is largely employed in this research. South Africa is the world’s most unequal nation. The South African economy grew steadily from 1992 to 2008, but the benefits were distributed unequally, such that income inequality actually worsened. It is necessary to get a truthful starting point for the church to address this need and the best way will be to discover the identity of the church. The church’s identity is described in the liturgical sense in three phases of involvement in society, namely (1) the gathering and sending of the local congregation; (2) the liturgical responsibility with the ecumenical church; and (3) the possible cooperation with those who do not share the Christian faith.
Metateoretiese vertrekpunte ten opsigte van wetenskaplike navorsing in die Liturgiek
Barend J. de Klerk
In die Skriflig , 2013, DOI: 10.4102/ids.v47i1.89
Abstract: Om die nuwe ontwikkelings in die Liturgiek grondig te kan beoordeel, moet na die metateoretiese onderbou van die verskillende standpunte gekyk word. Wanneer ’n navorser op die terrein van die Liturgiek nie hierdie wendings in sy metateoretiese vertrekpunte verreken nie, kan sodanige navorser of meegesleur word deur hierdie denkrigtings, of aan die ander kant, impulsief reaksionêr ’n onwetenskaplike oordeel daaroor uitspreek. Die navorsingsartikel het daarom ten doel om die eie reformatoriese metateoretiese vertrekpunte ten opsigte van die Liturgiek te probeer formuleer en om vas te stel wat die invloed daarvan is in die konteks van wendings in die denkklimaat asook die leefwêreld en kultuur waarin die wetenskaplike taak uitgevoer word. Hierdie navorsingsartikel het verder ten doel om ’n voorbeeld daar te stel hoe hierdie metateoretiese beskouing ’n navorsingsprojek kan stuur. Die wyse waarop God in die doop werksaam is en die effek daarvan op vergifnis en versoening in die Suid-Afrikaanse konteks, is die voorbeeld van hoe ’n navorsingsprojek in die wetenskap van die Liturgiek aangepak kan word.
Skriftuurlike perspektiewe op die effek van doop op vergifnis
Barend J. de Klerk
Verbum et Ecclesia , 2013,
Abstract: Scriptural perspectives on the effect of baptism on forgiveness. This article focused from a Scriptural perspective on the question of whether baptism can and should have an effect on forgiveness and reconciliation in the South African society. This aspect was examined because in one of the most widely used confessionals of the worldwide church, the Nicene Creed, the following words are found: ‘We believe in … one baptism for the forgiveness of sin’. Another reason for investigating the effect that baptism should have on forgiveness and reconciliation is the connection between God’s forgiveness and the calling on the baptised to forgive. The article highlighted the following five key points: God acts in baptism; the Triune God works in baptism; the covenant relationship is expressed in baptism; baptism is a baptism in Christ’s death and resurrection; God’s forgiveness and reconciliation in baptism call the baptised to forgive.
Hybrid Predictive Control Based on High-Order Differential State Observers and Lyapunov Functions for Switched Nonlinear Systems  [PDF]
Baili Su, Guoyuan Qi, Barend J. van Wyk
Applied Mathematics (AM) , 2013, DOI: 10.4236/am.2013.49A006

In this paper, a hybrid predictive controller is proposed for a class of uncertain switched nonlinear systems based on high-order differential state observers and Lyapunov functions. The main idea is to design an output feedback bounded controller and a predictive controller for each subsystem using high-order differential state observers and Lyapunov functions, to derive a suitable switched law to stabilize the closed-loop subsystem, and to provide an explicitly characterized set of initial conditions. For the whole switched system, based on the high-order differentiator, a suitable switched law is designed to ensure the whole closed-loop’s stability. The simulation results for a chemical process show the validity of the controller proposed in this paper.

Deletion, insertion and translocation of DNA sequences contribute to chromosome size polimorphism in Plasmodium berghei
Janse, Chris J.;Mons, Barend;
Memórias do Instituto Oswaldo Cruz , 1992, DOI: 10.1590/S0074-02761992000700013
Abstract: extensive chromosome size polymorphism in plasmodium berghei in vivo mitotic multiplication. size differences between homologous chromosomes mainly involve rearrangements in the subtelomeric regions while internal chromosomal regions are more conserved. size differences are almost exclusively due to differences in the copy number of a 2.3 kb subtelomeric repeat unit. not only deletion of 2.3 kb repeats occurs, but addition of new copies of this repeat sometimes results in the formation of enlarged chromosomes. even chromosomes which originally lack 2.3 kb repeats, can acquire these during mitotic multiplication. in one karyotype mutant, 2.3 kb repeats were inserted within one of the original telomeres of chromosome 4, creating an internal stretch oftelomeric repeats. chromosome translocation can contribute to chromosome size polymorphism as well we found a karyotype mutant in which chromosome 7 with a size of about 1.4 mb is translocated to chromosome 13/14 with a size of about 3 mb, resulting in a rearranged chromosome, which was shown to contain a junction between internal dna sequences of chromosome 13/14 and subtelomeric 2.3 kb repeats of chromosome 7. in this mutant a new chromosome of 1.4 mb is present which consists of part of chromosome 13/14.
Flying on the wings of Vollenhoven’s radical Christian worldview: A reconsideration of the usual typology of Christian worldviews
Barend J. van der Walt
Koers : Bulletin for Christian Scholarship , 2012, DOI: 10.4102/koers.v77i1.31
Abstract: This article investigated the traditional typology of Christian worldviews from the perspective of the Christian philosopher, D.H.Th. Vollenhoven (1892 1978). The usual categorisation started by Niebuhr (in 1951), and adopted by some Reformational scholars afterwards, is questioned as too simplistic, forcing Christian thinkers and schools of thought into five pigeonholes. Worldviews including the Christian ones are complex phenomena. They should not be considered, for example, as merely logical systems or aesthetic ’stories’. Vollenhoven’s systematic philosophy and historiography of philosophy (his thetical-critical approach) can provide some clues for a new way to describe different Christian worldviews, as well as to arrive at the outlines of a more radical and comprehensive Christian worldview based on God's threefold creational, inscripturated and incarnated revelation.
H.G. Stoker (1999–1993) as Christelike filosoof: ’n Historiese legende en ikoon, of nog steeds ’n kontemporêre mentor?
Barend J. van der Walt
In die Skriflig , 2013, DOI: 10.4102/ids.v47i1.86
Abstract: ’n Tradisie, wat ’n filosofiese tradisie insluit, kan alleen lewend bly as die verhaal daarvan aan die jonger geslag oorvertel word. Daarom bied hierdie inleidende en oorsigtelike artikel aan die leser iets oor die unieke filosofie van die Suid-Afrikaanse denker, Henk Stoker. Ter inleiding behandel dit die moontlike redes waarom sy denke in Suid-Afrika en elders vandag relatief onbekend is en minder invloedryk was in vergelyking met dié van die twee ander vaders van ’n reformatoriese filosofie, naamlik Dirk H.Th. Vollenhoven en veral Herman Dooyeweerd. Daarna word aandag geskenk aan die Suid-Afrikaanse milieu waarbinne sy filosofie gebore is. Die moontlike interne en eksterne teologiese en filosofiese invloede van veral Herman Bavinck (1854–1921) en Max Scheler (1874–1928) word behandel. Vervolgens word op enkele van Stoker se oorspronklikste bydraes tot die Christelik-filosofiese tradisie gewys. ’n Vlugtige blik word op die wedersydse kritiek tussen Stoker, Dooyeweerd en sekere leerlinge van Dooyeweerd gewerp. Ten slotte kan daar, in die lig van hierdie onderlinge verskille, sekere wanopvattings reggestel word, byvoorbeeld dat ’n Reformatoriese filosofie ’n statiese en geslote sisteem is. H.G. Stoker (1899–1993) as Christian philosopher: historical legend and icon, or still a contemporary mentor? Tradition which includes a philosophical tradition, can only been kept alive when its story is told to younger generations. This is the motivation behind this introductory overview of the unique philosophy of the South African philosopher, Henk Stoker. In comparison with the two other founders of a reformational philosophy, Dirk H.Th. Vollenhoven (1892–1978) and especially Herman Dooyeweerd (1994–1977), Stoker’s ideas are in South Africa, as well as abroad, less well-known among reformed people. The introductory part of this article, therefore, investigates the possible reasons for the relatively small impact of his thinking. The next section requires attention for the South African context in which his Christian philosophy was born. This is followed by a detailed discussion of the possible internal and external theological and philosophical influences of especially Herman Bavinck (1865–1921) and Max Scheler (1874–1928) on the emergence of Stoker’s philosophy of the idea of creation. A few of Stoker’s original contributions to a Christian philosophy are then highlighted. Next the debate between Stoker and Dooyeweerd and some of Dooyeweerd’s followers is reviewed. Finally, in the light of these differences between two of the fathers of the triumvirate already a
Die Christelike filosofie van D.H.Th. Vollenhoven (1892–1978): Hoe dit ontstaan en verder ontwikkel het
Barend J. van der Walt
In die Skriflig , 2013, DOI: 10.4102/ids.v47i1.80
Abstract: Hierdie artikel is die eerste in ’n reeks van drie wat handel oor die ontstaan van ’n reformatories-Christelike filosofie by D.H.Th. Vollenhoven (1892–1978), H. Dooyeweerd (1894–1977) van Nederland en H.G. Stoker (1899–1993) van Suid-Afrika. As algemene inleiding tot die trilogie word die vraag bespreek hoe hierdie filosofie vandag – 75 jaar na sy ontstaan – nog lewend en relevant kan wees. In hierdie eerste artikel, wat op die bydrae van Vollenhoven gefokus is, word die volgende behandel: (1) Ter inleiding word kortliks inligting oor sy persoonlikheid vermeld. (2) Aangesien veral kenteoretiese probleme in die brandpunt van belangstelling gestaan het ten tye van die geboorte van die reformatoriese filosofie aan die begin van die vorige eeu, volg ’n kort oorsig van hierdie wysgerige landskap. (3) Daarna word die moontlike invloede op Vollenhoven se denke van sowel buite (die sekulêre filosofiese milieu van sy tyd) as van binne(sy geesgenootlike tradisie) bespreek. (4) Die volgende hoofgedeelte vestig die aandag op Vollenhoven se pionierswerk vir sowel die die sistematiese filosofie as die filosofiese historiografie. (5) Dit word gevolg met ’n gedeelte oor hoedanig die nalatenskap van die driemanskap (Vollenhoven, Dooyeweerd en Stoker) deur daaropvolgende generasies ontvang is en hoe die reformatories-filosofiese tradisie verdeeld geraak het in die navolging van Vollenhoven, Dooyeweerd en Stoker. (6) Die verkenning word afgesluit met ’n aanduiding van die noue verbintenis tussen Vollenhoven (sy persoon asook sy filosofie) en Suid-Afrika en in die besonder Potchefstroom. The Christian philosophy of D.H.Th. Vollenhoven (1892–1978): How it originated and was developed. This article is the first in a series of three dealing with the emergence of a reformational-Christian philosophy in the work of D.H.Th. Vollenhoven (1892–1978), H. Dooyeweerd (1894–1977) of the Netherlands and H.G. Stoker (1899–1993) of South Africa. As a general introduction to the trilogy the question is how a tradition, the reformational philosophical tradition in particular, can today – 75 years after its inception – be kept alive and relevant. In this first article, focusing on Vollenhoven’s contribution, the following are dealt with: (1) As introduction, something briefly is said about his personality. (2) Since especially epistemological issues were key problems at the cradle of his reformational philosophy during the first part of the previous century, a brief historical background (up to the present postmodern situation) is provided. (3) The third main section investigates the possib
An impinging remnant meniscus causing early polyethylene failure in total knee arthroplasty: a case report
Rachid Saouti, Barend J van Royen, Christiaan M Fortanier
Journal of Medical Case Reports , 2007, DOI: 10.1186/1752-1947-1-48
Abstract: A 63-year old male patient with a history of symptomatic osteoarthritis of the left knee underwent a Total Knee Arthroplasty (TKA) of posterior cruciate ligament retaining design (Kinemax, Stryker, Mahwah, New Jersey, USA) without a patella component. The postoperative course was uneventful. Three weeks later he presented to our out patient clinic with sudden swelling and discomfort of his left knee. Clinical examination demonstrated medial joint line tenderness and confirmed the patient's impression of joint effusion. Radiographs demonstrated a well-aligned TKA. All complaints, with exception of the knee effusion, declined progressively over a period of months. Two years postoperatively, the patient developed increasing pain and complained of "catching" of the knee. Physical examination showed a stable knee with a normal range of motion of 130 degrees flexion with no extension deficit. There was a moderate swelling and joint line tenderness medially. Standard radiographs showed a well-aligned TKA with no signs of loosening or polyethylene wear (Figure 1). Laboratory analysis including a complete blood count with differential, erythrocyte sedimentation rate, C-reactive protein and knee aspiration for cell count and culture excluded infection. A technetium 99m diphosphonate bone scintigraphy showed an increased perfusion in the early phase and increased uptake in the static phase at the medial side of the femoral and tibial component and in the patella of the left knee (Figure 2).A diagnostic arthroscopy was performed to differentiate between a mechanical and a soft tissue related problem. Arthroscopy revealed a remnant of the posterior horn of the medial meniscus impinging between the posterior part of the femoral component and the polyethylene insert. There was also an important delamination of the anteromedial part of the insert with a crack at the ventral side associated with substantial synovitis and polyethylene debris scattered all around the joint. Slight del
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