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Search Results: 1 - 10 of 321414 matches for " L.F.;Deshaies "
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Numerical study of wedge supported oblique shock wave-oblique detonation wave transitions
Pimentel, C. A. R.;Azevedo, J. L. F.;Figueira da Silva, L.F.;Deshaies, B.;
Journal of the Brazilian Society of Mechanical Sciences , 2002, DOI: 10.1590/S0100-73862002000300002
Abstract: the results of a numerical study of premixed hydrogen-air flows ignition by an oblique shock wave (osw) stabilized by a wedge are presented, in situations when initial and boundary conditions are such that transition between the initial osw and an oblique detonation wave (odw) is observed. more precisely, the objectives of the paper are: (i) to identify the different possible structures of the transition region that exist between the initial osw and the resulting odw and (ii) to evidence the effect on the odw of an abrupt decrease of the wedge angle in such a way that the final part of the wedge surface becomes parallel to the initial flow. for such a geometrical configuration and for the initial and boundary conditions considered, the overdriven detonation supported by the initial wedge angle is found to relax towards a chapman-jouguet detonation in the region where the wedge surface is parallel to the initial flow. computations are performed using an adaptive, unstructured grid, finite volume computer code previously developed for the sake of the computations of high speed, compressible flows of reactive gas mixtures. physico-chemical properties are functions of the local mixture composition, temperature and pressure, and they are computed using the chemkin-ii subroutines.
Numerical study of wedge supported oblique shock wave-oblique detonation wave transitions
Pimentel C. A. R.,Azevedo J. L. F.,Figueira da Silva L.F.,Deshaies B.
Journal of the Brazilian Society of Mechanical Sciences , 2002,
Abstract: The results of a numerical study of premixed Hydrogen-air flows ignition by an oblique shock wave (OSW) stabilized by a wedge are presented, in situations when initial and boundary conditions are such that transition between the initial OSW and an oblique detonation wave (ODW) is observed. More precisely, the objectives of the paper are: (i) to identify the different possible structures of the transition region that exist between the initial OSW and the resulting ODW and (ii) to evidence the effect on the ODW of an abrupt decrease of the wedge angle in such a way that the final part of the wedge surface becomes parallel to the initial flow. For such a geometrical configuration and for the initial and boundary conditions considered, the overdriven detonation supported by the initial wedge angle is found to relax towards a Chapman-Jouguet detonation in the region where the wedge surface is parallel to the initial flow. Computations are performed using an adaptive, unstructured grid, finite volume computer code previously developed for the sake of the computations of high speed, compressible flows of reactive gas mixtures. Physico-chemical properties are functions of the local mixture composition, temperature and pressure, and they are computed using the CHEMKIN-II subroutines.
Die Kategismus van Calvyn (1545) en dié van Perkins (1590) – enkele vergelykings
L.F. Schulze
Koers : Bulletin for Christian Scholarship , 2009, DOI: 10.4102/koers.v74i4.144
Abstract: The Catechisms of Calvin (1545) and of Perkins (1590) – some comparisons A comparison between Calvin’s Geneva Catechism (1545) and the Catechism of William Perkins, “The foundation of Christian religion” (1590), shows striking differences. These cannot be explained by means of an “anti-Calvinist” stance on the part of Perkins. On the contrary, Perkins regarded himself as a follower of Calvin, which means that a subtle shift occurred within the doctrine of the Calvinist tradition towards the end of the sixteenth century. A comparison of the two catechisms is used here to illustrate the change. By way of introduction com-parisons are made about the addressees and the content of each catechism. With the importance of the Reformation’s “sola fide” in mind, the central issue in this article concerns a closer look at the concept of faith in both catechisms.
A note on the importance of the Ngoko-Krama distinction for the determination of Javanese language structure
L.F. Brakel
Bijdragen tot de Taal-, Land- en Volkenkunde , 1969,
Abstract:
Rectification
L.F. Brakel
Bijdragen tot de Taal-, Land- en Volkenkunde , 1976,
Abstract:
Wawelaar en Van Davelaar
L.F. Brakel
Bijdragen tot de Taal-, Land- en Volkenkunde , 1972,
Abstract:
Chairil Anwar as translator
L.F. Brakel
Bijdragen tot de Taal-, Land- en Volkenkunde , 1976,
Abstract:
Die donker kant van die Verligting
L.F. Schulze
Koers : Bulletin for Christian Scholarship , 1998, DOI: 10.4102/koers.v63i4.537
Abstract: The dark side of the Enlightenment The complex concept “Enlightenment" was ambiguous, even in the time of its inception in the 18th century. As such, it was ambivalent, revealing a dialectical tension between rational-irrational, and Christian-antichristian. The sunny face of the Age of Reason is well known: its rational, scientific, and "Christian" side. Its other side - dark, irrational, and antichristian - is less often explicated While mentioning aspects of its irrationalism, its antichristian character forms the focal point of this article. The Enlightenment was "Christian" in the sense of formulating Christian truth simply a little more "rationally"; yet "antichristian” in the sense of trading in Christianity for classical culture. Voltaire is called as a witness to this tension, and especially to the antichristian nature of this epoch. Since the rise of the Enlightenment Protestant churches in particular have displayed a disturbing openness towards this movement, embracing its (essentially antichristian) scientific ideals to promote Christian truth. The results of this impossible synthesis are seen, among others, in the tension between theological lecture room (reason) and pulpit (faith), and in the Western churches' (often) uncertain witness to Biblical truth. The dead end in which the mainstream liberal Enlightenment theology finds itself, is illustrated by the contradictory statements of theologians during the past fo u r decades about angels - statements which incurred the contempt of natural scientists like Tipler, Weinberg and Feynman. To see the dark side of the Enlightenment is a challenge to believers (including theologians) to reconsider their allegiance to its scientific ideals and to rethink their position as witnesses to the truth, which is in Christ.
Reformasie as herstel van die ware diens van God: enkele aanwysers by Calvyn en Zwingli
L.F. Schulze
Koers : Bulletin for Christian Scholarship , 1998, DOI: 10.4102/koers.v63i3.529
Abstract: Reformation as restoration of the true service of God - some indicators in the work of Calvin and Zwingli In this article an attempt is made to interpret the 16th century Reformation from a rarely mentioned, yet very real perspective, viz., as a restoration of the true service of God. It is indicated that the true service o f God is an overarching concept, encompassing more than simply an ecclesiastical reform, or a return to the Bible. Besides these aspects, true service o f God implies the renewal o f life with all its social, economical and political overtones, which cannot be discussed in full in an article. Data drawn from some works o f Calvin and Zwingli will hopefully prove the validity o f this perspective and offer Christians in the "new South Africa" thought-provoking ideas which should be put into action.
Een getuie, geen getuie: die herkoms en betekenis van die regsre l van meervoudige getuies
L.F. Schulze
Koers : Bulletin for Christian Scholarship , 2006, DOI: 10.4102/koers.v71i1.234
Abstract: One witness, no witness: the origin and meaning of the legal rule of multiple witnessess The practice of calling various witnessess to testify in court is so well known that it is taken for granted. Calvin even says that God “has naturally inscribed this law upon every heart”. Yet, in administering justice, it has not always been acknowledged and applied, thereby causing in many cases justice not to prevail. In searching for the origin of this vital rule, one has to go not to the Greeks or Romans, nor to the Babylonians or Persians, but to the Bible. It was given by God to Israel in establishing the truth and administering justice. It was a common rule during New Testament times and left its indelible stamp on the writings of the New Testament. In the fourth century it penetrated Roman law and eventually became part of Roman Dutch Law. One should respect the biblical meaning of terms like “witnessing” and “witness” as reflected in jurisprudence and reject the seemingly pious, but dubious practice endowing these terms with a spurious connotation.
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