180 research outputs found
A Cosmopolitan History of Archaeology: The Olov Janse Case
No full textThe life of international archaeologist Olov
Janse (1892–1985) demonstrates the complexity of personal identify formation. Janse
worked in Europe, Scandinavia, South East Asia and North America, spoke many different
languages, controlled many collections of artefacts, changed identity or character at
least five times, and nationality, three times. It is hoped the themes, elucidated
through Janse’s story, will encourage comparisons with, and analyses of, the careers of
other cosmopolitan archaeologists, and instigate an international history of archaeology
focused on mobility, translation and networks, rather than one based on the impact of
archaeology on the development of nation-states. A correction article relating to the abstract and author
affiliation of this publication can be found here: http://dx.doi.org/10.5334/bha.24
Lecithocera aenicta Janse 1954
No full text<i>Lecithocera aenicta</i> Janse, 1954 <p>(Fig. 3F)</p> <p> <i>Lecithocera aenicta</i> Janse, 1954: 337. TL: Verulam, South Africa. [TMSA].</p> <p> <b>Adult</b> (Fig. 3F). See also Janse (1954, Pl. 156, Fig. 1). Wingspan 12 <i>–</i> 15 mm.</p> <p> <b>Diagnosis.</b> <i>Male genitalia</i>. See Janse (1954, Pl. 140, Fig. 14- line drawing). Similar to those of <i>Lecithocera myopa</i> but terminal two-thirds of valva parallel-sided and only a little narrower than basal third, whereas in <i>L</i>. <i>myopa</i> the terminal two-thirds of valva are very narrow and tapering. The figure given by Janse (Pl. 151, Fig. 6) is erroneous (see Remarks below).</p> <p> <b>Material examined</b>. Type no. 3349, ♂ (holotype), [South Africa], Verulam, 28 i 1914, Janse, gen. slide no. 5760). Paratypes: 2♂. types no. 3350 (Umkomaas, 22 i 1914, Janse) and 3352 (Pretoria, 16 i 1917, H.G. Breyer); and 1 paratype in NHMUK. Additional specimens in TMSA: 1♂, Port North, 17 i 1917, C.J. Swierstra, gen. slide no. 5635.</p> <p> <b>Distribution</b>. South Africa (Gauteng, KwaZulu-Natal) (Janse 1954).</p> <p> <b>Remarks</b>. Janse (1954) illustrated the male genitalia of the types on Plate 140, Fig. 14, and also on Plate 151, Fig. 6, but they represent two different species. The figure of the former matches well the description of the male genitalia and the latter looks like those of <i>L. ideologa</i> Meyrick, 1937. Additional specimens are placed under the names of these two species; more than 10 under the name of <i>L. aenicta</i> and four under <i>L. ideologa</i> in the collection of TMSA, and they are probably misidentifications of other species (4♂, Knysna, C.P., Garden of Eden, 16–20 i 1955, A.J.T. Janse, gen. slide nos. 2885, 8645, 8662, & 8663; 3♀, same data as preceding specimens; and 1♂, 1♀, same locality, 10–14 i 1955, A.J.T. Janse). The genitalia of these specimens should be re-examined one by one in a future study (the first author had no time to examine all of them, due to the limited time of his visiting period). One male of the series was re-identified as <i>L. ideologa,</i> based on the examination of its genitalia (see the details in the “Remarks” of <i>L. ideologa.</i></p>Published as part of <i>Park, Kyu-Tek & Prins, Willy De, 2019, A review of the Lecithoceridae (Lepidoptera: Gelechioidea) of southern Africa, based on type specimens deposited in the Ditsong National Museum of Natural History (TMSA), with descriptions of three new species, pp. 61-89 in Zootaxa 4623 (1)</i> on pages 70-71, DOI: 10.11646/zootaxa.4623.1.5, <a href="http://zenodo.org/record/3253578">http://zenodo.org/record/3253578</a>
Ransomed by God into his household: interpreting the ransom imagery in 1 Peter within the economic context of its author and addressees
No full text1 Peter 1:18 states: "You know that you were ransomed... "(NRSV). This article offers an interpretation of the ransom image in 1 Peter within the economic context of the author and addressees, taking into consideration the relevant structure of economics (the geography and demography of the areas identified in the address of 1 Peter) and relevant performance of economics (production, distribution and consumption) in the area where the addressees of 1 Peter lived. After the problem statement and methodological clarification, the economic-historic context of the addressees is constructed, and the epistolographic characteristics of 1 Peter is defined. Then the ransom-imagery in 1 Peter is analysed and the referents of this ransom-imagery determined. Finally the ransom metaphor in 1 Peter is interpreted within the economic-historic context of its addressees.http://dx.doi.org/10.4314/actat.v33i2.14http://reference.sabinet.co.za/sa_epublication/theolo
Showing forth the great works of God: the witness of the people of God in the socio-historic context of 1 Peter and its implication for the church today
No full textMA (New Testament), North-West University, Potchefstroom CampusChristian communities often refer to the book of Acts and the missionary preaching
of the apostle Paul when they consider their witness to society. Missionary preaching
is therefore often seen as the main mode for witness and little attention is given to
the socio-historic context of the book and the social position of the apostle Paul. The
apostle Paul was an educated rabbi and Roman citizen and therefore well suited to
engage in missionary preaching. The hearers of 1 Peter, on the other hand, were
from a different social background. This study is focussed on the concept of witness
in the letter and the modes of witness which the author encourages within the sociohistoric
context of his hearers.
Thus, the socio-historic context of the hearers of the letter in the Petrine provinces
has been investigated and a comprehensive exegetical process has been applied to
the unit 1 Peter 2:4-10 in order to understand the theological identity of the hearers
and the witness motif in 1 Peter 2:5 and 9. Exegesis was done according to the
traditional grammatical-historical method. Furthermore, traditional methodologies like
structural, historical and grammatical analyses have been applied in investigating the
Old Testament references, and literary concepts, like intertextuality, have been
applied to further enhance the understanding.
Further, through exegesis, the identity of the resident aliens, household servants and
married women, and the modes of witness present in 1 Peter 2:11-3:6 were
analysed in their particular socio-historic-context.
One conclusion of this study is that two different modes of witness can be identified
in the section 1 Peter 2:4-10. Furthermore, the author, in consideration of the social
position of his hearers, chose a mode of witness that would have been most effective
in that context.
Thus, the letter of 1 Peter provides a biblical basis and mandate for Christian
communities to consider their social context in order to identify suitable modes of
witness that would be most effective in their particular situation.Master
A case study on the windows of the Witbank Dutch Reformed church: what they convey about the changing religio-political context of this Afrikaans Protestant church
No full textThe Witbank Dutch Reformed Church commissioned the author to remake some church windows, requesting changes in symbolism. This descriptive, explorative, qualitative case study
retrospectively examines the formal, tectonic and symbolic meaning of the church windows when built (1920-1923, architect W.B. Anderson), altered (1961-1963, architect D.P.
Kesting), and restored (2004-2006, glass artist: A. Janse van Rensburg), as an expression of this Afrikaans Protestant church community’s identity in the changing religio-political
context. The method was to establish a context through a literature study, to collect data and then to describe the church history, the window designers and their approaches, and
the windows in their architectural context, at each historic point. The meaning of the windows was explored. As the church’s identity changed in the religio-political context, the
windows were changed to match new perceptions of meaning. By 2004, church laity had become significantly engaged in the meaning expressed in their windows, driving the change
Does the (Dutch) devil wear Prada? A study on the impact of counterfeits on purchase intentions towards luxury fashion products in the Netherlands
No full textChallenges and opportunities for integrating lake ecosystem modelling approaches
No full textA large number and wide variety of lake ecosystem models have been developed and published during the past four decades. We identify two challenges for making further progress in this field. One such challenge is to avoid developing more models largely following the concept of others (‘reinventing the wheel’). The other challenge is to avoid focusing on only one type of model, while ignoring new and diverse approaches that have become available (‘having tunnel vision’). In this paper, we aim at improving the awareness of existing models and knowledge of concurrent approaches in lake ecosystem modelling, without covering all possible model tools and avenues. First, we present a broad variety of modelling approaches. To illustrate these approaches, we give brief descriptions of rather arbitrarily selected sets of specific models. We deal with static models (steady state and regression models), complex dynamic models (CAEDYM, CE-QUAL-W2, Delft 3D-ECO, LakeMab, LakeWeb, MyLake, PCLake, PROTECH, SALMO), structurally dynamic models and minimal dynamic models. We also discuss a group of approaches that could all be classified as individual based: super-individual models (Piscator, Charisma), physiologically structured models, stage-structured models and trait-based models. We briefly mention genetic algorithms, neural networks, Kalman filters and fuzzy logic. Thereafter, we zoom in, as an in-depth example, on the multi-decadal development and application of the lake ecosystem model PCLake and related models (PCLake Metamodel, Lake Shira Model, IPH-TRIM3D-PCLake). In the discussion, we argue that while the historical development of each approach and model is understandable given its ‘leading principle’, there are many opportunities for combining approaches. We take the point of view that a single ‘right’ approach does not exist and should not be strived for. Instead, multiple modelling approaches, applied concurrently to a given problem, can help develop an integrative view on the functioning of lake ecosystems. We end with a set of specific recommendations that may be of help in the further development of lake ecosystem model
Narrative Preaching: Theory and Praxis of a New Way of Preaching
No full textIntroduction:Perhaps the title is misleading. It may create the impression that narrative preaching is a never-before-discovered new method of communicating the gospel of salvation. Of course, stories have been used in sermons for a very long time. Narrative preaching as an art form is in itself a much-discussed and -published theme in the field of homiletics. Yet, in many ways, it is new. Compared to other forms of preaching such as expository preaching, thematic preaching and the homily, the narrative sermon is less used. As such, it does represent a new way of preaching formany. Furthermore, it is also new because it is only now receiving the attention it deserves in the South African context, and particularly in theDutch Reformed Church. While narrative preaching has been acknowledged in academic circles for some time, a handful of preachers have only recently become aware of the many possibilities of this form of preaching.The author is one example. He has been a minister for over thirty years,and although he used stories as illustrations, he never once preached a narrative sermon (per definition). From an academic point of view, he had read about the narrative, but only when he was asked to give a seminar on narrative preaching did serious research follow. This research had two important consequences. First, it led to the preparation of a scientific article, then it got “out of hand” and ended up as a book. Secondly, the research forced the author to prepare and deliver narrative sermons in order to test the basic theory in practice. This adventure brought new dimensions to the author’s repertoire and method of preaching. It is hoped that the reader will be inspired to become aware of the possibilitiespresented by narrative sermons, and that the book will also make the reader aware of the fact that narrative preaching is a difficult art form. Much dedication and practice will make narrative sermons strikingly effective. Last, but not least, it is hoped that the book will assist preachers in their discovery of how to preach narrative sermons.May God bless your preaching ministry!Johan Janse van RensburgFaculty of TheologyUniversity of the Free StateBloemfontei
Nucleation and crystal growth in batch crystallizers
No full textThe aim of the present work is to gain knowledge of the mechanism of formation of the crystal size distribution in batch crystallizers in order to give directives for design and operation of batch crystallizers. The crystal size distribution is important for the separation of crystals and mother liquid, the subsequent washing and drying of the crystals, and the product properties. Cumulative mass distributions and population density distributions are used side by side. The average crystal size and the spread in sizes, determined from the cumulative mass distribution, are used to correlate with the relevant process parameters, whereas the time-dependent population density distributions are used to interpret the formation of the distribution in terms of nucleation and growth. A schematic description of a cycle of a batch crystallizer and the main design choices are given in chapter 2. The nucleation and growth mechanisms are reviewed in chapter 3. There, it is shown that the usually applied interpretation of the width of the meta-stable zone gives misleading information about the primary nucleation rate because the nuclei have to grow to a detectable size before detection. An explanation is given for the experimentally often reported relation between the width of the meta-stable zone and the cooling rate based on the fact that the nuclei have to reach a minimum size before detection. Further, the mechanisms of secondary nucleation are briefly reviewed. The discussion of the growth kinetics leads to the conclusion that the growth rate can vary from crystal to crystal when the surface integration step partly or completely determines the growth rate ; growth dispersion can occur. The development in time of the crystal size distribution was simulated for assumed models for the primary and secondary nucleation rate and the growth rate. The results of the simulations, discussed in chapter 4, show that the population density distribution of the primary crystals exhibits a maximum, which is formed at the instant of maximum supersaturation. A unique relation exists between the maximum population density and the final average crystal size when primary nucleation occurs exclusively. This relation is independent of the primary nucleation kinetics and the cooling rate. The population density of the secondary crystals increases with decreasing crystal size. The total distribution is a superposition of the distribution of the primary crystals, mainly formed in the period of high supersaturation, and the distribution of secondary crystals, mainly formed in the final phase of the crystallization period. The horizontal distance between two population density distributions is independent of the crystal size when the growth rate is size independent. The horizontal distance increases with crystal size when the growth rate increases with size or when growth dispersion occurs. Thus, the time-dependent development of the population density distribution gives information about nucleation and growth. The literature data on crystal size distributions from unseeded and seeded batch crystallizers are reviewed in chapter 5. Only a small number of references deals with time-dependent distributions, most references deal with the effect of the process parameters on the final average crystal size. In general the average size decreases with increasing stirrer speed and cooling rate. Relatively little information is gained about the mechanism of distribution formation. Crystallization experiments were carried out in a 48 1 unseeded batch crystallizer with aqueous solutions of potassium dichromate and potassium alum. The experimental equipment and procedure are described in chapter 6; the results are presented and discussed in chapter 7. For potassium dichromate, the average crystal size increases with decreasing stirrer speed and is independent of the cooling rate, whereas for potassium alum the average crystal size increases with decreasing stirrer speed and decreasing cooling rate. The thermal treatment of the solution (thermal history) does not affect the crystallization kinetics of both substances. Attrition of large potassium dichromate crystals occurs at high stirrer speed; attrition of potassium alum crystals does not occur. The time-dependent population density distributions show that the crystal growth of both substances is not size independent; growth experiments reveal that growth dispersion occurs. It is concluded from the population density distributions that the primary nucleation rate is not only a function of the supersaturation, but also of the stirrer speed and the cooling rate. The primary nucleation rate is by approximation proportional to the stirrer speed to the power t2 to +4 and the cooling rate to the power -2 to -5. The exact relation between the primary nucleation rate, the supersaturation, the stirrer speed and the cooling rate was not determined since this relation is not necessary for the design of batch crystallizers. The number of small, secondary potassium dichromate crystals increases with increasing stirrer speed and decreasing cooling rate, which is consistent with the experimentally determined secondary nucleation rate in a continuous crystallizer. The number of small, secondary potassium alum crystals increases with increasing stirrer speed and increasing cooling rate; these trends are in agreement with known secondary nucleation kinetics. The different trends for both substances are caused by a different dependence of the secondary nucleation rate on the supersaturation (cooling rate). The implications of the results for the method of operation and the design of batch crystallizers are discussed in chapter 8. A design procedure is outlined which takes into account the production rate specification, the product properties specification and the possible formation of incrustation.Mechanical, Maritime and Materials Engineerin
Houten kappen in Nederland 1000-1940
No full textKappen van grote gebouwen en woonhuizen zijn in Nederland tot ver in de 19de eeuw altijd van hout gemaakt. Er is een grote verscheidenheid aan constructiewijzen. In dit boek komen houten kapconstructies aan de orde uit de periode tussen 1000 en 1940. De tijdspanne is in drie perioden onderverdeeld. De eerste periode behandelt de middeleeuwen tot 1575 met de sporen- en gordingenkappen, de houten tongewelven en enkele andere interessante typen. Hierbij zijn ook vele kappen in België en de Duitse grensgebieden besproken. De tweede periode valt ongeveer samen met het tijdperk van de Republiek der Zeven Verenigde Nederlanden, een periode waarin naast de traditionele kappen ook mèer gecompliceerde houten kapconstructies werden gemaakt, onder meer op kerken en grote openbare gebouwen. Het laatste gedeelte beschrijft de periode van 1800 tot 1940, waarin hang- en schoorwerken en Philibertspanten verschijnen. Na 1900 komen nieuwe ontwikkelingen met onder meer de vakwerkspanten en de gelamineerde spanten naar voren. In het boek worden tevens enkele algemene onderwerpen beschreven, zoals het houtgebruik, de betekenis van telmerken, de historische terminologie en de functie van de gilden. Ter illustratie zijn bestekken van houten kappen uit de verschillende perioden toegevoegd en overzichten van vele honderden houten kappen, die uit perioden van de llde eeuw tot de 20ste eeuw in Nederland bewaard bleven
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