Littérature scientifique sur le sujet « Van Sommer »
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Articles de revues sur le sujet "Van Sommer"
1
Turnau, Elz̀bieta. « Note on the preservational nature of ornamentation in sphaeromorphs assignable to <i>Tapajonites</i> ; Sommer & ; van Boekel, 1963 (Prasinophyta?) ». Journal of Micropalaeontology 19, no 2 (1 décembre 2000) : 159–62. http://dx.doi.org/10.1144/jm.19.2.159.
Texte intégralRésumé :
Abstract. Assemblages of Middle Devonian (Givetian) phytoplankton from the Holy Cross Mountains include sphaeromorphs possessing blister-like ornamentation typical of the genus Tapajonites Sommer & van Boekel, 1963. Study of the sculptural elements under high magnification indicates the presence of patterns resembling impressions of pyrite crystals. It is suggested that ornamentation in Tapajonites, or at least in some sphaeromorphs assignable to that genus, is of a secondary nature.
2
Eggers, Kurt, Luc F. De Nil et Bea R. H. Van den Bergh. « The Efficiency of Attentional Networks in Children Who Stutter ». Journal of Speech, Language, and Hearing Research 55, no 3 (juin 2012) : 946–59. http://dx.doi.org/10.1044/1092-4388(2011/10-0208).
Texte intégralRésumé :
Purpose The purpose of this study was to evaluate whether previously reported questionnaire-based differences in self-regulatory behaviors (Eggers, De Nil, & Van den Bergh, 2009, 2010) between children who stutter (CWS) and children who do not stutter (CWNS) would also be reflected in their underlying attentional networks. Method Participants consisted of 41 CWS (mean age = 6;09; years;months) and 41 CWNS (mean age = 6;09) ranging in age from 4;00 to 9;00. Participants were matched on age and gender. The efficiency of the attentional networks was assessed by using the computerized Attention Network Test (Fan, McCandliss, Sommer, Raz, & Posner, 2002). Results Primary results indicated that CWS had a significantly lower efficiency of the orienting network compared with CWNS, whereas no differences were found on the alerting or executive control network. Conclusion Current findings corroborate previously found differences in self-regulatory behavior and were taken to suggest a possible role for attentional processes in developmental stuttering.
3
Ernst, Christoph, et Jens Schröter. « Die Zukunft vorstellen – Technologie-Demonstrationen in der Geschichte digitaler Medien – Imagining the Future – Technology Demonstrations in the History of Digital Media ». Technikgeschichte 88, no 1 (2021) : 79–106. http://dx.doi.org/10.5771/0040-117x-2021-1-79.
Texte intégralRésumé :
Der vorliegende Text widmet sich der Bedeutung von Technologie-Demonstrationen in der Geschichte digitaler Medien. Diese werden als performative Praktiken betrachtet, in denen die Zukunft einer Technologie im Fokus steht. Unter Bezug auf einschlägige sozialwissenschaftliche Forschung diskutiert der Text die Rolle sogenannter imaginaries im Rahmen von Technologie-Demonstrationen. Diese theoretische Schwerpunktsetzung wird im Folgenden auf die Geschichte der Technologie-Demonstration im Bereich digitaler Medientechnologien bezogen. Aufbauend auf dem Gedanken, das speziell die Demonstration von User-Interfaces als Anker für die Mobilisierung von Imaginationen rund um die Zukunft digitaler Technologien dient, sichtet der Text drei Fallbeispiele: 1. die Präsentation des ‚oN-Line-System (NLS)‘ am 9. Dezember 1968 durch Douglas Engelbart; 2. die 100-tägige Demonstration des interaktiven Fernsehens Piazza virtuale während der documenta IX im Sommer 1992 durch die Medienkünstlergruppe Van Gogh-TV; 3. die Keynote-Präsentation des damaligen Apple CEO Steve Jobs anlässlich der Markteinführung des ersten iPhones am 9. Januar 2007. Anhand dieser teils kanonischen, teils vergessenen Beispiele zeigt sich die Bedeutung von Technologie-Demonstrationen für die soziale Vermittlung von neuen Technologien. Der Text schließt mit dem Argument, dass die Geschichte der Imagination digitaler Medien, wie sie in diesen Demonstrationen exemplarisch analysierbar wird, als ein integraler Bestandteil der Geschichte digitaler Medientechnologien generell zu betrachten ist.
4
Hargittai, Istvan. « Response to Peter van Sommers ». Leonardo 31, no 2 (1998) : 149. http://dx.doi.org/10.2307/1576524.
Texte intégral
5
Licht-Strunk, Els. « Om somber van te worden ! » Huisarts en Wetenschap 52, no 11 (novembre 2009) : 522–26. http://dx.doi.org/10.1007/bf03085774.
Texte intégral
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Stowell, Robin. « Ludwig Van Beethoven, Piano Concerto in D major op. 61a, edited by Hans-Werner Küthen (Munich : Henle, 2005). €24 - Ludwig Van Beethoven, Piano Concerto in D Major op. 61a, edited by Hans-Werner Küthen ; piano reduction by Jürgen Sommer ; fingering by Klaus Schilde (Munich : Henle, 2005). €12 ». Nineteenth-Century Music Review 5, no 1 (juin 2008) : 168–69. http://dx.doi.org/10.1017/s1479409800002780.
Texte intégral
7
Botha, E. « Vrouekarakters in enkele prosawerke van C.M. van den Heever ». Literator 24, no 1 (1 août 2003) : 37–48. http://dx.doi.org/10.4102/lit.v24i1.279.
Texte intégralRésumé :
The role of women in some prose works of C.M. van den Heever Re-reading the C.M. van den Heever “classics” Somer (1935) and Laat vrugte (1939) within the framework of Van den Heever criticism through the years, one becomes aware that central themes in his oeuvre are acted out by women. The beautiful young girl Linda in Somer embodies the sadness of the transcience of beauty and happiness. Through Ouma Willa, Betta and Johanna – three women from three generations in Laat vrugte – the theme of the endurance of the memory of love and passion beyond decay and death is expressed. A cursory examination of other and earlier works by Van den Heever – Op die plaas (1927), Langs die grootpad (1928), Kromburg (1937) and the short story “Leuens” (Lies) from Vuurvlieg en sterre (1934) – bears out the observation that women express core meanings in C.M. van den Heever’s prose works.
8
Steenberg, D. H. « Shalom van ’n Afrikanerdom tikmasjienpianis : Suidpunt-jazz van André Letoit ». Literator 11, no 3 (6 mai 1990) : 121–30. http://dx.doi.org/10.4102/lit.v11i3.817.
Texte intégralRésumé :
Hierdie opskrif laat min of meer reg geskied aan ’n belangrike baken in die ontwikkeling van die Afrikaanse prosa aan die einde van ’n dekade wat begin het met die meer tradisionele klem op die persoonlike, soos in die kortverhale van Hennie Aucamp en M.C. Botha. Nie dat dit by die private ache bly steek het nie! Sonder gevaar van teenspraak kan ’n mens hierdie roman ná die resepsie van Somer II en die ooreenkoms wat dit daarmee toon, as postmodernistiese teks benader. In die loop van hierdie bespreking sal om die beurt aan kernwoorde in die opskrif aandag gegee word.
9
Somers, Eduard. « Beginselen van het volkenrecht – 1958 ». Pro Memorie 21, no 2 (1 janvier 2019) : 263–66. http://dx.doi.org/10.5117/pm2019.2.059.some.
Texte intégral
10
Devriese, Luc, et Francine Somers. « Op vrijdag (vertaling) ». Ghendtsche Tydinghen 46, no 3 (1 mai 2017) : 220–21. http://dx.doi.org/10.21825/gt.v46i3.16915.
Texte intégralThèses sur le sujet "Van Sommer"
1
DE, FABRITIIS PAOLA. « Lo sviluppo della flessibilità rappresentazionale ». Doctoral thesis, Università degli Studi di Trieste, 2003. http://hdl.handle.net/10281/36599.
Texte intégralRésumé :
Representational flexibility is usually assessed in the graphic domain by whether children can innovate canonical drawings. According to the Karmiloff-Smith’s RR Model (RRM 1990), flexibility is acquired with a marked discontinuity at 8-9 years, when routine drawings are overcome once and for all. RRM, though, is inherently recursive, implying that innovation entertains a continuous trade-off with graphic conservatism along development. In this regard, a less recent model by van Sommers (1984) suggests that pictorial conservatism coexist with flexibility, even in adulthood, and that continuity models fit better flexibility development. This study aims at comparing the two models and their ability to predict the relationship between conservatism and flexibility during development. 75 children (5, 7, 9, 11 year-olds) and 20 adults were asked to draw two similar and two different houses (administration order balanced across the sample). Drawings were coded with a 5 point scale for 6 aspects (e.g. house’s structure and details). Results show that linear trends fit flexibility development in all aspects. Adults draw canonical houses more than older children, although score highly in the differentiation task. Results suggest that flexibility coexist with some conservatism even in adults, lending support to van Sommers’s model, in these regards.
2
Redouaby, Marouan. « Sur la méthode de Van Der Corput pour les sommes d'exponentielles ». Nancy 1, 1999. http://www.theses.fr/1999NAN10224.
Texte intégralRésumé :
Les développements actuels de la méthode de Van der Corput pour les sommes d'exponentielles font apparaître la nécessité d'apporter des précisions aux transformations de base A et B. La première partie de cette thèse constitue une étude complète de la transformation B simple; le cas des sommes d'exponentielles avec paramètre est également étudié. Dans la deuxième partie, nous étudions un nouveau procédé de majoration pour les sommes simples d'exponentielles qui consiste à adapter la méthode de Fouvry et Iwaniec à celle de Van der Corput. Les résultats obtenus viennent compléter un tableau de Huxley. Enfin, la troisième partie reprend en détail le lemme de la phase stationnaire, le résultat obtenu donne une estimation (probablement) optimale pour les moyennes d'intégrales oscillantes en vue d'applications à la transformation B simple, double et multipleIn modern methods for analytic exponential sums theory, the A and B Van der Corput's process occur in various forms where more accuracy is needed. The' first part of this thesis achieves a complete study of B process for single exponential sums or sums with a parameter. In the second part, Fouvry and Iwaniec's method for multiple exponential sums with monomial is combined with A and B Van der Corput's process to get new bounds for single exponential sums which complete Huxley's table. The third part gives an accurate estimation for single oscillating integrals when the critical point is close to the endpoints of the integration interval which applies to mean values of oscillating integrals such as those that occur in the study of multiple B transform
3
Del, Rio Louis. « Utilisation d’un processus d’optique non linéaire en somme de fréquences dans le cadre de l’optique cohérente appliquée à l’imagerie haute résolution ». Limoges, 2009. https://aurore.unilim.fr/theses/nxfile/default/b72793dd-5942-49de-87c0-ca3332ab309a/blobholder:0/2009LIMO4070.pdf.
Texte intégralRésumé :
Le travail présenté dans cette thèse tend à faire un premier pas vers l’utilisation de l’optique non linéaire dans le contexte interférométrique de la synthèse d’ouverture en astronomie optique. L’objectif principal de ce travail consiste à caractériser expérimentalement un phénomène d’interférences de signaux infrarouges en transférant les propriétés vers les signaux convertis dans le domaine visible par somme de fréquences. Les signaux infrarouges seront mélangés avec un laser de pompe monochromatique et polarisé rectilignement à 1,064 μm dans un cristal non linéaire PPLN (Niobium de Lithium à polarisation périodiquement inversée) de type massif ou guide d’onde afin d’être converti à une longueur d’onde de 632 nm. Cette opération est effectuée en entrée des deux voies d’un interféromètre fibré. Les signaux convertis sont ensuite recombinés, mélangés et comparés aux résultats obtenus par un interféromètremonté en parallèle et travaillant directement à la longueur d’émission des sources infrarouges à 1,55 μm. Dans la pratique, nous avons effectué nos expériences dans une configuration des plus simples afin de mesurer la cohérence temporelle puis spatiale des sources en analysant les signaux convertis. Tout d’abord nous avons utilisé un rayonnement bi-fréquences centré autour 1,55 μm avec un faible écart spectral pour démontrer expérimentalement le transfert de la cohérence temporelle par somme de fréquences, conséquence du théorème de Wiener Kinchine. Dans un deuxième temps, nous avons utilisé un doublet spatial à 1,55 μm pour démontrer expérimentalement le transfert de la cohérence spatiale, conséquence du théorème de Zernike Van CittertThe main scope of the present thesis is to pave the way for the use of non-linear optics in the context of interferometric synthetic aperture in astronomy. The principal achievement is the experimental characterization of the interference of infrared signals with an interferometer working at visible light. This fact is made possible through the use of a nonlinear up-conversion mechanism which preserves the information of the phase front of the signal. The infrared signals at 1,550 μm have been mixed with a common monochromatic pump laser linearly polarized at 1,064 μm in periodically poled Lithium Niobate crystals. Either bulk crystals or waveguides have been used to obtain final up-converted radiations at 632 nm. The simplest case of stellar interferometer combines the radiation of two telescopes. To replicate the same observation at visible wavelengths, we used two distinct up-conversion stages driven by a common pump. The up-converted signals are then recombined andmixed. Such results have been systematically compared with those obtained by a parallel experimental setup based on an infrared interferometer working as a reference. We have focused our experiments to very simple and archetypal configurations in which we measured their temporal or spatial coherence by analyzing the up-converted radiations. In a first set of experiments the signal was composed by a doublet of closely spaced frequencies a bi-frequency radiation centered around 1. 55 μm with a low spectral gap. Our scope was to demonstrate experimentally that the up-converion by sum frequency generation keeps preserved the temporal coherence, as a consequence of theWiener Kinchine theorem. In a second set of experiments, we used a spatial doublet at 1. 55 μm to demonstrate that the same wavelength up-conversion also preserves the spatial coherence, as predicted by the corresponding theorem of Van Cittert Zernike
4
Woerden, Koenraad van [Verfasser], Justin [Akademischer Betreuer] Noel et Niko [Akademischer Betreuer] Naumann. « Some computations with the F-homotopy limit spectral sequence / Koenraad van Woerden ; Justin Noel, Niko Naumann ». Regensburg : Universitätsbibliothek Regensburg, 2017. http://d-nb.info/1140642081/34.
Texte intégral
5
Van, den Berg Marlene. « A phytochemical analysis of some ancient narcotics, with comparative notes on some South African folk medical practices / Marlene van den Berg ». Thesis, North-West University, 2008. http://hdl.handle.net/10394/2874.
Texte intégralRésumé :
Ancient medicine is a fast-growing field of research at international level, but since successful research implies both medical (or pharmaceutical) knowledge and the ability to read Latin and Greek, only one classicist in South Africa has published on the topic in co-operation with a medical doctor.
Although the professional and scholarly literature on ancient Greek and Roman medicine has proliferated in the last few decades, few studies have appeared that focus on narcotics and analgesics, their effects as observed and recorded by physicians, pharmacologists, and medical botanists, and an evaluation according to modern pharmacology or phytochemistry.1
The study is especially topical in the light of the modern-day search for herbal medicines and the renewed interest in South African ethno botanical traditions (e.g. Afrikaner, Zulu, Swazi) as opposed to chemically prepared narcotics.
Phytochemical properties of crude drugs have predictable physiological effects in the living human organism. Therefore, presuming that humans have not changed except incrementally in their physiological chemistry over the short span of two millennia, one can likewise document the effects of narcotics and analgesics in Graeco-Roman pharmacology, provided that the botanical sources and their manufactured forms are carefully identified. A secondary assumption is that ancient plants also carried phytochemical properties generally identical to modern ones, so that the descriptive nomenclatures of modern botany and phytochemistry reveal multiple pharmacological principles and their actions in ancient drugs, as well as their potentially undesirable side effects.
1. One of the exceptions is the 1995 "The Opium Poppy in Hellenistic and Roman Medicine" by Prof. John Scarborough (in Roy Porter and Mikulas Teich, eds., Drugs and Narcotics in History [Cambridge and New York: Cambridge University Press]).Thesis (Ph.D. (Latin))--North-West University, Potchefstroom Campus, 2009.
6
Gumede, Daniel Mfana. « An evaluation of some cognitive, affective, and school variables as predictors of the academic achievement of standard 10 pupils in Kwazulu schools / Daniel Mfana Gumede ». Thesis, Potchefstroom University for Christian Higher Education, 1989. http://hdl.handle.net/10394/9308.
Texte intégralRésumé :
1. DIE DOEL VAN DIE NAVORSING: Die doel van hierdie navorsing was om die beste voorspellers van akademiese prestasie (dit is persentasie slaag) onder die kognitiewe, affektiewe en skoolveranderlikes vas te stel. Die teikengroep het uit standerd 10 leerlinge in Kwazulu skole
bestaan. 2. DIE BEVINDINGE UIT DIE LITERATUUR: Om die voorgemelde doel te bereik 1s die oorsig van literatuur met verwysing na die vermelde onafhanklike veranderlikes gedoen, en die volgende gevolgtrekkings is bereik.
2.1 DIE VOORSPELLINGSWAARDES VAN DIE KOGNITIEWE VERANDERLIKES: Betreffende die voorspellingswaarde van die kognitiewe veranderlikes, het die literatuur daarop gewys dat die kognitiewe veranderlikes ongeveer 25 persent van die variansie in die akademiese prestasie verklaar. Belangrik in hierdie verband is die bevindinge deur Lavin (1967), Bloom (1979) en talle ander wat die voorspellingswaarde van intelligensie en aanleg ondersoek het. Die ander belangrike bevinding, in verband met intelligensie as voorspeller van akademiese prestasie, is dat die voorspellingswaarde van intelligensie daal as die leerlinge die hoer klasse bereik. Met ander woorde, intelligensie is volgens die literatuur 'n goeie voorspeller van akademiese prestasie in die primêre klasse. Sowel Lavin (1967) as Jensen (1980) het hierdie bewering gemaak. Die voorspellingswaarde van vorige deur die literatuur te bestudeer.
literatuur daarop gewys dat voorspeller van akademiese prestasie is. Wat aanleg as voorspeller van akademiese prestasie betref, wys die literatuur daarop dat variansie wat grater as 25 persent in akademiese prestasie is, verklaar kan word op grond van aanleg. In hierdie verband kan die werke van Von Mollendorf (1978) en Vander Westhuizen (1987) genoem word.
2.2 DIE VOORSPELLINGSWAARDE VAN DIE AFFEKTIEWE VERANDERLIKES: Die affektiewe veranderlikes wat hier betrokke is, is persoonlikheid
en beroepsbelangstelling.
Betreffende die voorspellingswaarde van persoonlikheid is teenstrydige
bevindinge in die literatuur verkry. Enersyds het
ondersoeke wat in Amerika gedoen is, getoon dat die byvoeging
van die persoonlikheidsveranderlikes by die kognitiewe veranderlikes
in die voorspelling van akademiese prestasie 'n toename
in die verklaring van variansie meebring. Andersyds het die
navorsing wat in Suid-Afrika gedoen is, nie 'n duidelike beeld
gegee nie. In die algemeen het die Suid-Afrikaanse ondersoeke
daarop gewys dat die persoonlikheidsveranderlikes van min waarde
is in die voorspelling van akademiese prestasie.
Uit die studie van die literatuur, betreffende die voorspellingswaarde
van beroepsbelangstelling, het dit geblyk dat beroepsbelangstelling
van minder waarde is in die voorspelling van
akademiese prestasie is as beroepsbelangstelling.
2.3 DIE VOORSPELLINGSWAARDE VAN DIE SKOOLVERANDERLIKES: Die skoolveranderlikes is in twee groepe verdeel: die fisiese wat skoolgrootte, klasgrootte,
skoolligging en skool fasiliteite behels, en die sosiale wat die prinsipaal en die onderwysers behels.
Die oorsig van die literatuur het daarop gewys dat die
fisiese fasiliteite belangrik is vir opvoeding, maar hulle
uitwerking op die kwaliteit van onderrig afhanklik is van hulle
benutting deur die onderwysers. Byvoorbeeld, kleiner klasse het
nie beduidend bygedra tot beter prestasie as die grater klasse
nie. Die gevolgtrekking wat deur Bloom (1976) onder andere,
bereik is, is dat die hele skoolomgewing belangrik is vir
onderrig en n1e net die fisiese fasiliteite nie. Ongeveer 5
persent van die variansie in akademiese prestasie is volgens
Bloom (1979) deur die skool verklaar. Dit was om hierdie rede
dat die hele skool in hierdie ondersoek bestudeer is.
Literatuur het ook deurgaans daarop gewys dat die verskille
tussen die skole in akademiese prestasie verdwyn as
intelligensie en die sosio-ekonomiese status gekontroleer is.
2.4 DIE INVLOED VAN GESLAG OP AKADEMIESE VOORSPELLING: Die literatuur het daarop gewys dat die twee geslagte se
akademiese prestasie verskil. Die dogters, byvoorbeeld,
presteer beter as seuns in toetse wat verbale aanleg verg,
terwyl die seuns beter as dogters in wiskunde presteer: Die
twee geslagte het geen verskille in intelligensie getoon nie.
3. DIE EMPIRIESE ONDERSOEK
3.1 DIE FORMULERING VAN HIPOTESES: 3. 1. 1 Hoof hipotese
HOOF HIPOTESE 1 - Die aanleg veranderlikes is die beste voorspellers van standerd
10 akademiese prestasie in vergelyking met die affektiewe en die
skoolveranderlikes.
HOOF HIPOTESE 2 - Die affektiewe veranderlikes bring 'n toename mee in die
variansie wat verklaarbaar is in akademiese prestasie as dit by
die kognitiewe veranderlikes bygevoeg word.
HOOF HIPOTESE 3 - Die skoolveranderlikes bring 'n toename mee in die variansie wat
verklaarbaar is in akademiese prestasie as dit by die kognitiewe
veranderlikes bygevoeg word.
3.1.2 Onderhipotese
ONDERHIPOTESE 1 - Die gehalte van die skool het beduidende invloed op die
voorspelling van akademiese prestasie in standerd 10.
ONDERHIPOTESE 3 - Die ligging van die skool het 'n beduidende invloed op die
voorspelling van akademiese prestasie in standerd 10.
ONDERHIPOTESE 4 - Skoolsoort het 'n beduidende invloed op die voorspelling van
akademiese prestasie in standerd 10.
ONDERHIPOTESE 5 - Geslag het 'n beduidende invloed op die voorspelling van
akademiese prestasie in standerd 10.
ONDERHIPOTESE 6 - Daar bestaan steeds 'n verskil tussen koshuis en dagskole in
akademiese prestasie selfs as aanleg gekontroleer is.
ONDERHIPOTESE 7 - Daar bestaan steeds 'n verskil tussen stedelike en plattelandse
skole in akademiese prestasie selfs as aanleg gekontroleer is.
3.2 DIE EMPIRIESE ONDERSOEK: Die empiriese ondersoek is ingestel om die geformuleerde
hipoteses te toets.
3.2.1 Die teikengroep en die steekproef
Die KwaZulu 1983 standerd 10 leerlinge is die teikengroep. Om
die invloed van die ~kool op voorspelling vas te stel is 'n 10
persent ewekansige steekproef uit 170 sekondêre skole geneem
(dit is 17 skole). As gevolg van die ewekansige steekproef is
'n monster van 1912 leerlinge gevorm. Die vermindering van die
steekproef tot 1615 leerlinge in sommige analises, is 'n gevolg
van onvolledige data van sekere leerlinge.
3.2.2 Die veranderlikes wat gebruik is
3.2.2.1 Die onafhanklike veranderlikes wat in hierdie ondersoek
gebruik is, is die volgende:
a. Aanlegtoetsresultate (AAT)
b. Persoonlikheidsresultate (HSPQ)
c. Belangstellingsresultate (VIQ)
d. Skoolveranderlikheidstotaal (SVTOT)
3.2.2.2 Die afhanklike wat in hierdie ondersoek gebruik is, is
die volgende:
e. Standerd 10 geslaag persentasie.
3.2.2.3 Die modererende veranderlikes wat in hierdie studie bestudeer is, is
die volgende:
f. Die skoolgehalte;
g. Die vakgroepe wat die leerlinge leer;
h. Die ligging van die skool (stedelik of plattelands);
i. Skooltipe (koshuis of dag); en
j. Geslag.
In hierdie ondersoek is gebruik gemaak van gestandardiseerde
meetinstrumente om kognitiewe, en affektiewe veranderlikes te
meet. Om die "skool" te meet is verskeie skoolveranderlikes
eers geoperasionaliseer en daarna punte volgens rangorde deur
die inspekteurs toegeken.
Geslag is in hierdie ondersoek as modererende veranderlike
gebruik om die invloed daarvan op voorspelling te bestudeer. Om
die invloed van die skool as 'n modererende veranderlike te
bestudeer is die steekproef verder verdeel volgens skoolgehalte,
skoolligging en skooltipe. Die leerlinge was ook gegroepeer
volgens die vakgroepe wat hulle geneem het (dit is algemeen,
natuurwetenskap en handel).
4. STATISTIESE TEGNIEKE WAT IN HIERDIE NAVORSING GEBRUIK IS EN
DIE RESULTATE VAN DIE ONDERSOEK: 4.1 MEERVOUDIGE REGRESSIE-ANALISE: Deurgaans
toegepas is die meervoudige regressie-analise (BMDPIR program)
om die beste voorspellers van akademiese prestasie te
identifiseer. Die resultate van die analise het daarop gedui
dat:
i. die kognitiewe veranderlikes die beste voorspellers van
akademiese prestasie is, in vergelyking met die affektiewe
en die skoolveranderlikes;
ii. die affektiewe veranderlikes van min voorspellingswaarde
is; en
iii. die skoolveranderlike 'n beduidende effek op voorspellings
het.
As gevolg van meervoudige regressie-analise is die kognitiewe en
skoolveranderlikes gebruik as kontrole veranderlikes in die
moderatorveranderlike studie. Die affektiewe veranderlikes is
weggelaat weens hulle geringe bydrae tot R2 .
4.2 VARIANSIE ANALISE: Die meervoudige regressie-analise (BMDPIR) is ook gebruik by die
moderatorondersoek. Die resultate van die ondersoek het daarop
gedui dat:
i. die skoolgehalte 'n beduidende invloed op die voorspelling
van akademiese prestasie het;
ii. die vakgroepe wat leerlinge leer 'n beduidende invloed op
akademiese voorspelling het;
iii. die skoolligging 'n beduidende invloed op akademiese voor
spelling het;
iv. die skooltipe 'n beduidende invloed op akademiese voorspelling
het;
v. geslag geen beduidende invloed op die voorspelling van algehele
akademiese prestasie het nie;
vi. die verskil in akademiese prestasie tussen die koshuisskole
en dagskole bly steeds dieselfde selfs as aanleg gekontroleer is; en
vii. die verskil in die akademiese prestasie van stedelike en
plattelandse leerlinge steeds dieselfde bly selfs as aanleg
gekontroleer is.
5. IMPLIKASIES VIR VERDERE ONDHRSOEK: In hierdie studie is gevind dat aanleg 'n goeie voorspeller van
akademiese prestasie in goeie skole is, maar nie in swak skole
nie. 'n Geldigheidsstudie is nodig om swak voorspelbaarheid in
swak skole vas te stel. Sulke geldigheidstudies moet die
sistematiese veranderlikes ook bestudeer sodat hulle invloed op
R2 verklaar kan word.
In hierdie studie is ook gevind dat die plattelandse skole
akademies beter as stedelike skole presteer.
Die bevinding is teenstrydig met die bevindinge van die vorige
navorsers. 'n Verdere studie is dus ook nodig om die bevindinge
van hierdie studie te bevestig of te verwerp. Die moontlikheid
bestaan dat hierdie bevinding die invloed van die onrus wat
gedurende daardie jare plaasgevind het, weerspieël.
Verdere navorsing is ook nodig om die invloed van die groepvakke
op akademiese prestasie te bevestig en o.a. die geldigheid van die
resultate van hierdie navorsing te toets.
Verdere navorsing is nodig om die waarde van die insluiting van
'n toets in moedertaal in die AAT battery vir voorspellings van
akademiese prestasie vas te stel. Die resultate van hierdie
studie (kyk tabel 6 • 2 ) het getoon dat die AAT die swakste met
Zulutaal korreleer. 'n Toets in moedertaal blyk dus nodig te
wees.
6. OPVOEDKUNDIGE IMPLIKASIE: Die kruisvalidasie van die beste stelveranderlikes het daarop
gewys dat dit goed by goeie skole kan voorspel en nie by swak
skole nie. Om al die skole se akademiese prestasie te verbeter,
word dit aanbeveel dat die toetse aan die begin van die jaar
toegepas moet word en dat die nuwe snitpunte (kyk paragraaf 6.7)
by die verwagtingstabel gebruik moet word. Die vroegtydige
beskikbaarheid van die toetsresultate kan help om leerlinge en
die onderwysers te motiveer om beter te presteer.Thesis (MEd)--PU vir CHO, 1989
7
Bryhagen, Camilla, et Malin Nilsson. « Hur blir det sommar ? : en studie om pedagogens uppfattningar om vad och hur barn lär naturvetenskap ». Thesis, Högskolan Kristianstad, Sektionen för lärande och miljö, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:hkr:diva-9162.
Texte intégralRésumé :
Denna studie behandlar hur lärare undervisar i naturvetenskap och vilken didaktik de använder. Det finns många synpunkter kring hur den naturvetenskaplig undervisning bör vara utformad, men fungerar teorierna i praktiken? Vad tror pedagogerna på fältet, som vi talat med? Vad är en effektiv inlärningsmetod? Hur formar man som pedagog sin undervisning efter sina elevers erfarenheter och hur utvecklar kan de hjälpa eleverna att få en djupare förståelse för naturvetenskapliga fenomen? Det är vad denna studie kommer att handla om. Vårt syfte är att belysa att det finns många olika sätt och perspektiv på den naturvetenskapliga didaktiken. Vi har använt oss av kvalitativa intervjuer av pedagoger ute i verksamheterna som alla har något att delge av hur de praktiserar sin didaktik och hur de ser på elevers lärande inom de naturvetenskapliga områdena.
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Van, Wyk Hendrik Schalk Jacobus. « Local governance for environmental sustainability : an overview of some environmental law principles in South Africa / Hendrik Schalk Jacobus van Wyk ». Thesis, North-West University, 2006. http://hdl.handle.net/10394/1235.
Texte intégral
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Feng, Zhaosheng. « Some results on the 1D linear wave equation with van der Pol type nonlinear boundary conditionsand the Korteweg-de Vries-Burgers equation ». Diss., Texas A&M University, 2004. http://hdl.handle.net/1969.1/1078.
Texte intégralRésumé :
Many physical phenomena can be described by nonlinear models. The last few decades have seen an enormous growth of the applicability of nonlinear models and of the development of related nonlinear concepts. This has been driven by modern computer power as well as by the discovery of new mathematical techniques, which include two contrasting themes: (i) the theory of dynamical systems, most popularly associated with the study of chaos, and (ii) the theory of integrable systems associated, among other things, with the study of solitons.
In this dissertation, we study two nonlinear models. One is the 1-dimensional vibrating string satisfying wtt − wxx = 0 with van der Pol boundary conditions. We formulate the problem into an equivalent first order hyperbolic system, and use the method of characteristics to derive a nonlinear reflection relation caused by the nonlinear boundary conditions. Thus, the problem is reduced to the discrete iteration problem of the type un+1 = F (un). Periodic solutions are investigated, an invariant interval for the Abel equation is studied, and numerical simulations and visualizations with different coefficients are illustrated.
The other model is the Korteweg-de Vries-Burgers (KdVB) equation. In this dissertation, we proposed two new approaches: One is what we currently call First Integral Method, which is based on the ring theory of commutative algebra. Applying the Hilbert-Nullstellensatz, we reduce the KdVB equation to a first-order integrable ordinary differential equation. The other approach is called the Coordinate Transformation Method, which involves a series of variable transformations. Some new results on the traveling wave solution are established by using these two methods, which not only are more general than the existing ones in the previous literature, but also indicate that some corresponding solutions presented in the literature contain errors. We clarify the errors and instead give a refined result.
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Mezger, Peter Richard. « Corrosion behaviour of dental casting alloys some palladium-containing alloy developments : een wetenschappelijke proeve op het gebied van de geneeskunde en tandheelkunde / ». Nijmegen : Katholieke Universiteit te Nijmegen, 1989. http://catalog.hathitrust.org/api/volumes/oclc/38087336.html.
Texte intégralLivres sur le sujet "Van Sommer"
1
Camargo, Fundação Iberê, Museu Oscar Niemeyer et São Paulo (Brazil : State). Pinacoteca do Estado, dir. Zero : Zero / edited by Heike van den Valentyn ; editorial office, Violeta Quesada, Cristina Sommer, Heike van den Valentyn. Curitiba, PR : Museu Oscar Niemeyer, 2013.
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2
Steytler, Klaas. In die somer van '36. Kaapstad : Tafelberg, 1991.
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Koch, Koen. De slag van de Somme 1916. Amsterdam] : Ambo, 2009.
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4
Somer, Hendrick van, 1607-approximately 1656, dir. Hendrick Van Somer : Due pittori in uno. Napoli : Edizioni Napoli arte, 2021.
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5
Philippart, Frank. De Atlantikwall : Van Willemstad tot de Somme : een gids langs de Duitse verdedigingslinie van de Tweede Wereldoorlog. Tielt : Lannoo, 2004.
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Saarloos, Wim, et José Dijck. The Dutch Polder Model in science and research. NL Amsterdam : Amsterdam University Press, 2017. http://dx.doi.org/10.5117/9789462988163.
Texte intégralRésumé :
Scientific research in the Netherlands is doing remarkably well. Dutch researchers, universities and institutes reside at or near the top of international rankings. In this essay, José van Dijck and Wim van Saarloos, the president and vice-president of the Royal Netherlands Academy of Arts and Sciences (KNAW), explore how such a small country could become a global player in science and research. They highlight interconnectedness, collaboration, trust, and interwoven research and education among the quintessentially Dutch factors that paved the way to the success. They also show, however, that the country's efforts to reach the top sometimes chip away at these trusted foundations. Investments in its research base are lagging, and some typically Dutch strengths have recently come under pressure. They close off with some suggestions on how the country may turn the tide, prolong its great achievements, and ensure a leading role for Dutch research in the nation's future.
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Dotzler, Bernhard J., et Berkan Karpat, dir. Götzendämmerung - Kunst und Künstliche Intelligenz. Bielefeld, Germany : transcript Verlag, 2021. http://dx.doi.org/10.14361/9783839459768.
Texte intégralRésumé :
Every new beginning comes from some other beginning's end - Seneca. Die hypermoderne Verschiebung der Aufmerksamkeit von Künstler:innen zum maschinellen Prozess, der den künstlerischen Akt zur Mittelwertermittlung von Datenstrukturen reduziert, ist vollzogen. Der Mensch ist in ein neues, epochales Verhältnis zur Maschine eingetreten. Die Beiträger:innen des Bandes zeigen, dass Kunst gleichzeitig immer mehr in den Alltag des politisch-sozialen Raumes hineinwächst und im ästhetischen Kontext ein neues Verhältnis zwischen Mensch und Maschine schafft. »Götzendämmerung« war der Auftakt zu einer Reihe von Ausstellungen im Haus der Kunst München und ist nun dessen Dokumentation, Reflexion und Fortführung.
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Schuurman, Bart. Becoming a European Homegrown Jihadist. NL Amsterdam : Amsterdam University Press, 2018. http://dx.doi.org/10.5117/9789462986930.
Texte intégralRésumé :
How and why do people become involved in European homegrown jihadism? This book addresses this question through an in-depth study of the Dutch Hofstadgroup, infamous for containing the murderer of filmmaker Theo van Gogh, who was killed in November 2004 in Amsterdam, and for plotting numerous other terrorist attacks. The Hofstadgroup offers a window into the broader phenomenon of homegrown jihadism that arose in Europe in 2004 and is still with us today. Utilizing interviews with former Hofstadgroup participants and the extensive police files on the group, Becoming a European Homegrown Jihadist overcomes the scarcity of high-quality data that has hampered the study of terrorism for decades. The book advances a multicausal and multilevel understanding of involvement in European homegrown jihadism that is critical of the currently prevalent 'radicalization'-based explanatory frameworks. It stresses that the factors that initiate involvement are separate from those that sustain it, which in turn are again likely to differ from those that bring some individuals to actual acts of terrorism. This is a key resource for scholars of terrorism and all those interested in understanding the pathways that can lead to involvement in European homegrown jihadism.
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Beuningen, Cor, et Kees Buitendijk, dir. Finance and the Common Good. NL Amsterdam : Amsterdam University Press, 2019. http://dx.doi.org/10.5117/9789463727914.
Texte intégralRésumé :
Over the past fifty years, (financial) capitalism has brought about an enormous growth in wealth. Millions around the world have been lifted out of poverty. However, the downsides of the present global economic constitution are rapidly becoming evident as well. Rising inequality, soaring debt levels, and repeated cycles of boom and bust have proven to be some of its key characteristics. After the 2008 crisis brought the financial system to the brink of collapse, new regulations, stricter supervision, higher capital requirements, and ethical codes were introduced to the sector. Today we find ourselves in the middle of another economic boom. Yet one pressing question remains: has anything changed? Have the (necessary) repairs fixed the flaws in the system? Or do we require even more fundamental reforms? This volume builds on the observation that society has co-evolved with the financial sector. We cannot simply claim that 'finance' was the sole instigator of the 2008 crisis. Society itself has become financialized; the process of replacing relations, structures of trust and reciprocity, by anonymous and systemic transactions. The volume poses vital questions with regard to this societal development. How did this happen? And more importantly: is change possible? If yes, how? This volume contains 21 essays on the themes mentioned above. Authors include Jan Peter Balkenende, Wouter Bos, Lans Bovenberg, Govert Buijs, and Herman Van Rompuy. A recommendation by Dutch Minister of Finance Wopke Hoekstra is also included.
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Nevskiy, Sergey, Aleksandr Hudokormov, Mihail Pokidchenko, Irina Chaplygina, Al'fred Shyuller, Zigena Gol'dshmidt et Yoahim Cvaynert. The history of the concept of social market economy in Germany. ru : INFRA-M Academic Publishing LLC., 2021. http://dx.doi.org/10.12737/1703180.
Texte intégralRésumé :
The monograph traces the history of the development of German neoliberal economic thought from the origins of the Freiburg School in the 1930s to the first results of the practical implementation of the concept of a social market economy in West Germany in the late 1940s-early 1960s. The author demonstrates the broad historical context of the development of German ideas about the theory and practice of the policy of order (Ordnungstheorie und Ordnungspolitik), shows the features of the formation and spread of the scientific and intellectual economic tradition in Germany, as well as beyond its borders, starting with the birth of the German historical school and the perception of its heritage by Russian socio-economic thought in the second half of the XIX — early XX century and ending with the practical implementation of the concept of order of the Freiburg school and the correlation of its ideological and spiritual and moral foundations with the social teaching of Catholicism and liberalism of Friedrich von Hayek. Special attention is paid to some controversial issues of the formation of the theory of ordoliberalism during the period of national socialism and the problems of the social market economy in modern Germany.
The book is intended to fill the shortage of specialized scientific literature on relevant issues and to acquaint the Russian reader, primarily students, teachers and researchers, with the variety of ideological and scientific-theoretical foundations of the socio-economic system of the post-war Germany.
Chapitres de livres sur le sujet "Van Sommer"
1
de Groot, J. J. B., et A. de Vor. « Sombere stemming ». Dans Therapie van alledaagse klachten, 419–28. Houten : Bohn Stafleu van Loghum, 2017. http://dx.doi.org/10.1007/978-90-368-1922-0_45.
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de Groot, J. J. B., B. Terluin, H. de Vries et A. T. F. Beekman. « Sombere stemming ». Dans Diagnostiek van alledaagse klachten, 1021–35. Houten : Bohn Stafleu van Loghum, 2016. http://dx.doi.org/10.1007/978-90-368-1274-0_64.
Texte intégral
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van Marwijk, H. W. J., H. de Vries et A. T. F. Beekman. « Sombere stemming ». Dans Diagnostiek van alledaagse klachten, 763–74. Houten : Bohn Stafleu van Loghum, 2007. http://dx.doi.org/10.1007/978-90-313-6530-2_58.
Texte intégral
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de Groot, J. J. B., F. A. W. van Raalten, M. van der Plas et A. T. F. Beekman. « Sombere stemming ». Dans Diagnostiek van alledaagse klachten, 803–12. Houten : Bohn Stafleu van Loghum, 2021. http://dx.doi.org/10.1007/978-90-368-2620-4_68.
Texte intégral
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van Marwijk, H. W. J., B. Terluin, H. de Vries et A. T. F. Beekman. « 63 Sombere stemming ». Dans Diagnostiek van alledaagse klachten, 831–40. Houten : Bohn Stafleu van Loghum, 2011. http://dx.doi.org/10.1007/978-90-313-8364-1_64.
Texte intégral
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Pröbstl-Haider, Ulrike, Claudia Hödl, Kathrin Ginner, Martin Falk, Florian Borgwardt, Herbert Formayer, Marc Olefs et Kai Illing. « Outdooraktivitäten und damit zusammenhängende Einrichtungen im Sommer und in den Übergangszeiten ». Dans Tourismus und Klimawandel, 123–56. Berlin, Heidelberg : Springer Berlin Heidelberg, 2020. http://dx.doi.org/10.1007/978-3-662-61522-5_7.
Texte intégralRésumé :
AbstractDer Sommertourismus in Österreich trägt wesentlich zu der großen Bedeutung des Tourismus insgesamt bei. So hat die Zahl der Nächtigungen in den Sommermonaten in Österreich 2018 erneut einen Höchstwert erreicht. Mit bisher 68,67 Mio. Nächtigungen liegt die Sommersaison 2018 (Mai bis September) um 2,2 % über dem Vorjahresniveau. Auch die Zahl der Ankünfte stieg in der vergangenen Sommersaison um 2,9 % auf 21,70 Mio. (Statistik Austria 2018). Mehr Nächtigungen wurden auch im September 2018, also außerhalb der eigentlichen Sommersaison festgestellt. Im September 2018 nahm die Zahl der Gäste um 2,0 % auf 3,86 Mio. zu, Gästenächtigungen stiegen um 1,4 % auf 11,24 Mio. Zu diesem Ergebnis trugen die ausländischen Herkunftsmärkte mit einem Plus von 1,6 % auf 7,86 Mio. bei. Die Nächtigungszahlen wichtiger Herkunftsländer, wie Deutschland (+1,2 %), Schweiz und Liechtenstein (+3,5 %) sowie der Niederlande (+2,1 %), erhöhten sich weiter. Die Zahl der inländischen Gästenächtigungen stieg ebenfalls um 0,9 % auf 3,38 Mio. (Statistik Austria 2018).
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Diebold, Céline. « Wie wirksam ist Regionalförderung ? » Dans Die Wirtschaft im Wandel, 195–99. Wiesbaden : Springer Fachmedien Wiesbaden, 2021. http://dx.doi.org/10.1007/978-3-658-31735-5_31.
Texte intégralRésumé :
ZusammenfassungDas Ziel der Regionalpolitik ist die Förderung strukturschwacher Gebiete, damit sie zum nationalen Durchschnitt aufschliessen. Doch die Steuermittel sind knapp und haben viele gute Verwendungen. Auch die Regionalförderung muss sich mit ihrem Nutzen rechtfertigen. Ist sie tatsächlich wirksam, die Entwicklung benachteiligter Gebiete mit zusätzlichen Investitionen anzustossen? Oder erschöpft sie sich in reinen Mitnahmeeffekten, indem sie Investitionen fördert, welche die Unternehmen ohnehin getätigt hätten? Führt sie zu einer Verlagerung von Investitionen und Beschäftigung von nicht geförderten zu geförderten Gebieten, ohne dass die Gesamtwirtschaft profitiert? Kann die Regionalförderung eine nachhaltige, selbsttragende Entwicklung anstossen, die auch dann noch bestehen bleibt, wenn die Förderung wieder ausläuft? Oder bleibt der neu geschaffene Wohlstand dauerhaft von Subventionen abhängig?Criscuolo Chiara, Ralf Martin, Henry G. Overman und John Van Reenen (2019), Some Causal Effects of an Industrial Policy, American Economic Review 109, 48–85.
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Pröbstl-Haider, Ulrike, Claudia Hödl, Kai Illing, Robert Ranzi et Oliver Fritz. « Indooraktivitäten und damit zusammenhängende Einrichtungen ». Dans Tourismus und Klimawandel, 157–68. Berlin, Heidelberg : Springer Berlin Heidelberg, 2020. http://dx.doi.org/10.1007/978-3-662-61522-5_8.
Texte intégralRésumé :
ZusammenfassungDer Aufbau und Ausbau von landschaftsunabhängigen Angeboten, wie Wellness- und Indoorsportanlagen, wird häufig in Zusammenhang mit einer Förderung des Ganzjahrestourismus genannt und als Möglichkeit gesehen, die Winter- bzw. Schneeabhängigkeit von Alpendestinationen zu verringern. Solche schneeunabhängigen Angebote scheinen vor allem für Destinationen in tieferen Höhenlagen eine geeignete Möglichkeit zu sein, sich an die veränderten klimatischen Bedingungen anzupassen und eine Saisonverlängerung in den Sommer und Frühherbst hinein zu erzielen (Müller und Weber 2007; Müller et al. 2007; Scott und McBoyle 2007; Siegrist und Gessner 2011; Clivaz et al. 2012).
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Klingenböck, Ursula. « »Ich bleibe hier« : ». Dans Alter(n)skulturen, 217–34. Bielefeld, Germany : transcript Verlag, 2022. http://dx.doi.org/10.14361/9783839459928-011.
Texte intégralRésumé :
Ursula Klingenböck widmet sich in diesem Beitrag der Frage nach der Darstellung des Alter(n)s im deutschsprachigen Comic. Am Beispiel von Thomas von Steinaeckers und Barbara Yelins »Der Sommer ihres Lebens« werden Konzeptionen des Alter(n)s, deren zeitliche und räumliche Figurationen sowie deren sprachliche und visuelle Kodierungen untersucht. Das Interesse gilt den physischen und psychischen Faktoren, den sozialen und kulturellen Dimensionen und nicht zuletzt den politischen Implikationen eines ›westlich‹ codierten Alter(n)s. Dabei ist immer auch zu fragen, welche theoretischen Konzeptionen des Alter(n)s der Comic aufgreift und inwieweit er sich in aktuellen Alter(n)sdiskursen positioniert. Der text-bildwissenschaftliche Fokus wird u.a. durch Aspekte von ›Geschlecht‹ bzw. ›Körper‹ und ›Behinderung/Pflegebedürftigkeit‹ sowie deren intersektionelle Verschränkungen perspektiviert.
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Fritz, Oliver, Ulrike Pröbstl-Haider, Kathrin Ginner et Herbert Formayer. « Festivals, kulturelle Events, Großveranstaltungen, Sportgroßveranstaltungen und Lifestyle Events ». Dans Tourismus und Klimawandel, 179–91. Berlin, Heidelberg : Springer Berlin Heidelberg, 2020. http://dx.doi.org/10.1007/978-3-662-61522-5_10.
Texte intégralRésumé :
ZusammenfassungDie Durchführung touristischer Großveranstaltungen führt nicht nur zu erhöhten CO2-Emissionen in Österreich (APCC 2014), sondern ist selbst vom Klimawandel betroffen, wenn etwa Hitzetage im Sommer den Erlebniswert einer Outdoorveranstaltung beeinträchtigen, Unwettergeschehen zu Absagen führen oder Wintersportveranstaltungen aufgrund von Schneemangel gefährdet sind.
Actes de conférences sur le sujet "Van Sommer"
1
Coroiu, I. « Estimation of Some Parameters from Morse-Morse-Spline-Van Der Waals Intermolecular Potential ». Dans SIXTH INTERNATIONAL CONFERENCE OF THE BALKAN PHYSICAL UNION. AIP, 2007. http://dx.doi.org/10.1063/1.2733270.
Texte intégral
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Wolf, E., J. Jannson et T. Jannson. « Analogue of the van Cittert-Zernike theorem for statistically homogeneous wavefields ». Dans OSA Annual Meeting. Washington, D.C. : Optica Publishing Group, 1989. http://dx.doi.org/10.1364/oam.1989.thr3.
Texte intégralRésumé :
A classic theorem due to van Cittert and Zernike establishes a one-one correspondence between the distribution of the degree of coherence of light generated by a spatially incoherent planar source and the distribution of the complex amplitude in a certain monochromatic field produced by diffraction at an aperture.1 In this paper we present a somewhat analogous theorem which expresses a one-one correspondence between the distribution of the degree of spatial coherence throughout any statistically homogeneous wavefield that propagates into a half-space and the complex amplitude distribution in an associated monochromatic wavefield that propagates into the same half-space. With the help of this theorem one can readily obtain information about the 3-D distribution of the degree of spatial coherence in certain types of statistical wavefield from well-known solutions of some wave propagation problems.
3
Cuong, Bui Cong, et Le Hoang Son. « SOME SELECTED PROBLEMS OF MODERN SOFT COMPUTING ». Dans NGHIÊN CỨU CƠ BẢN VÀ ỨNG DỤNG CÔNG NGHỆ THÔNG TIN. Publishing House for Science and Technology, 2016. http://dx.doi.org/10.15625/vap.2015.000203.
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Jedrzejewski, F. « Stochastic Stability of Some Hamiltonian Systems ». Dans ASME 2002 Pressure Vessels and Piping Conference. ASMEDC, 2002. http://dx.doi.org/10.1115/pvp2002-1144.
Texte intégralRésumé :
Stochastic stability plays an important role in modern theories of nonlinear structural dynamics. Recently, more realistic models based on stochastic modelling and Itoˆ calculus, like flow induced vibrations and seismic excitations have been proposed. In this paper, the almost-sure asymptotic stability of some hamiltonian systems subjected to stochastic fluctuations is investigated. Dynamical systems are reduced to Itoˆ stochastic differential equations for the averaged hamiltonian by using a new stochastic averaging method. The stability of the original system is determined approximately by examining the behavior of the averaged hamiltonian. Analytical expressions for the stochastic stability exponents are obtained. The proposed procedure is illustrated on the Rayleigh Van der Pol Oscillator.
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Teller, Davida Y., Annemarie Succopl et E. Eugenie Hartmann. « Quantification of monocular motion asymmetries with counterphase gratings and motion nulling techniques ». Dans Noninvasive Assessment of the Visual System. Washington, D.C. : Optica Publishing Group, 1992. http://dx.doi.org/10.1364/navs.1992.sud1.
Texte intégralRésumé :
Some adult patients with a history of strabismus, amblyopia, and/or related problems, when tested monocularly, show an asymmetry of optokinetic nystagmus (OKN). The asymmetry is such that patterns moving temporal-to-nasal (T-N) elicit OKN more readily than do nasal-to-temporal (N-T) patterns (Mohn, Sireteanu, and van Hof-van Duin, 1986). Similarly, some such patients exhibit asymmetries of smooth pursuit eye movements and perceived velocity (Tychsen and Lisberger, 1986).
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Son, Khuat Thanh, Nguyen Truong Thang, Le Phe Do et Bui Trong A. Dam. « RESEARCH SOME LATTICE CIPHERS IN FULLY HOMOMORPHIC ENCRYPTION ». Dans THE 14TH NATIONAL CONFERENCE ON FUNDAMENTAL AND APPLIED INFORMATION TECHNOLOGY RESEARCH. Nhà xuất bản Khoa học tự nhiên và Công nghệ, 2021. http://dx.doi.org/10.15625/vap.2021.0104.
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Thang, Trinh Dinh, Do Thi Lan Anh, Tran Minh Tuyen et Nguyen Thi Ha. « SOME PROPERTIES OF THE BALANCED BLOCK SCHEMA ON THE BLOCKS AND SLICES ». Dans THE 14TH NATIONAL CONFERENCE ON FUNDAMENTAL AND APPLIED INFORMATION TECHNOLOGY RESEARCH. Nhà xuất bản Khoa học tự nhiên và Công nghệ, 2021. http://dx.doi.org/10.15625/vap.2021.0083.
Texte intégral
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Colantoni, Simone, Girolamo Tripoli, Devidasa Pai Gorte, Francesco Franchini, Fabio Rossetti et Marco Spagnolo. « Twin Shaft Gas Turbine Variable Area Turbine Nozzle : Analytical Modeling and Optimization of Kinematic Chain ». Dans ASME Turbo Expo 2016 : Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-57702.
Texte intégralRésumé :
Some of twin shaft gas turbines models of GE are equipped with Variable Area Turbine Nozzle (VATN), also called Nozzle Guide Vane (NGV) as the first stator stage of Low Pressure Turbine (LPT). By varying the throat area, VATN controls the energy split between the High Pressure Turbine (HPT) and Low Pressure Turbine, allowing higher operational flexibility and higher efficiency at partial load/speed. This flexibility is an important requirement for gas turbine in mechanical drive applications. This paper is focused on the design, development and optimization of a numerical Finite Element (FE) model of the kinematic chain implemented to actuate the variable area turbine nozzles, in order to evaluate the required force as input to size and design the actuator. The kinematic chain is composed of an arrangement of linkage components that transfer the load provided by the actuator to the VATN and achieve a desired rotation of VATN airfoil around its axis. The load provided by actuator has to balance the aerodynamic load taking into account the contribution of friction developed inside the kinematic chain. The FE model has been specifically developed to evaluate the effects of different parameters, such as manufacturing tolerances and assembly clearances, in terms of total actuation force requirement, stress/life of the components and friction distribution. The additional scope of the detailed FE model is to represent an analytical validation criterion of the results obtained through a simplified spreadsheet-based tool which aims to be a reliable and quick responding system both for new product design phase and for implemented fleet issues resolution.
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van Bremen, Timothy, et Ondřej Kuželka. « Lifted Inference with Tree Axioms ». Dans 18th International Conference on Principles of Knowledge Representation and Reasoning {KR-2021}. California : International Joint Conferences on Artificial Intelligence Organization, 2021. http://dx.doi.org/10.24963/kr.2021/57.
Texte intégralRésumé :
We consider the problem of weighted first-order model counting (WFOMC): given a first-order sentence ϕ and domain size n ∈ ℕ, determine the weighted sum of models of ϕ over the domain {1, ..., n}. Past work has shown that any sentence using at most two logical variables admits an algorithm for WFOMC that runs in time polynomial in the given domain size (Van den Broeck 2011; Van den Broeck, Meert, and Darwiche 2014). In this paper, we extend this result to any two-variable sentence ϕ with the addition of a tree axiom, stating that some distinguished binary relation in ϕ forms a tree in the graph-theoretic sense.
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Ji, Xingxing, Chunwei Gu, Hong Liu et Weihong Xie. « Performance Calculation of a Three-Shaft Gas Turbine : Experiment Evaluation and Analysis ». Dans ASME Turbo Expo 2013 : Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gt2013-94490.
Texte intégralRésumé :
Analytical and experimental researches on the characteristics of a three-shaft gas turbine are presented in the paper. The concerned gas turbine engine includes a twin-shaft gas generator and a third shaft — the free turbine for power generation. The free turbine uses a variable-angle nozzle (VAN) for fuel saving and load-adjusting flexible. The engine performance is calculated by using the multi-dimensional Newton-Raphson method, which is based on a set of matching constraints described by the error matrix and the performance maps of the related components. It has a better accuracy and stability than those of some other methods (e.g. parameter cycle method) and is well suitable for solving the off-design problem. The suggested prediction method, presented as a computer program written in Fortran 95, is extremely flexible and can be employed to various engine configurations. Experiments are carried out on the concerned engine by controlling the stagger angle of the VAN, then adjusting the fuel consumption for different outputs. The accuracy of the prediction method is validated by the experiment. Detailed performance characteristic of the engine is investigated under five different stagger angles of the VAN when the T3 value was controlled from 85% to 105% of its design value, revealing how the T3 and the stagger angle of the VAN affect the gas turbine performance. The results are useful for the engine operation and components optimization.
Rapports d'organisations sur le sujet "Van Sommer"
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Neumann, Wiebke, Fredrik Stenbacka, Jonas Malmsten, Anders Johansson et Göran Ericsson. Årsrapport GPS-märkta älgar och inventeringar i brandområdet 2021-2022 – Fördelning, rörelse, livsmiljö, bärris och spillning. Institutionen för vilt, fisk och miljö, Sveriges lantbruksuniversitet, 2022. http://dx.doi.org/10.54612/a.4bj3vproqo.
Texte intégralRésumé :
Nu har det redan gått två år sen vi sjösatte referensområdet ’Ljusdal’. Vi ser att årets observationer förstärker bilden vad vi såg året innan i området, samt vissa observationer liknar vad vi ser i andra studieområden, medan andra skiljer sig åt. Studieområdet i Ljusdal är speciellt i två avseenden som berör älgar direkt och därmed skiljer sig åt från andra studieområden: brandfältet och en hög täthet av brunbjörn. Som förväntat ser vi skillnader mellan olika älgindivider och resultaten liknar vad vi sett i andra delar av landet - en del älgar har helt skilda sommar- och vinterområden, andra har områden som överlappar delvis, och ett fåtal verkar ha i stort sett helt överlappande områden. Av de 39 älgar vi kunde följa under mars 2021-2022, var drygt hälften stationära där några älgar har förflyttat sig bara en kort sträcka mellan sitt vinter- och sommarområde. Den andra halvan hade klart avskilda säsongsområden där merparten höll sig inom 20-25 km radie till sitt vinterområde. Men vi kunde också följa några riktiga långvandrare! Tjugofem av de 39 GPS-märkta älgarna kunde vi lokalisera i brandfältet under året. Hur länge älgarna uppehöll sig inom brandområdet varierade mellan individerna. Stationära älgkor återfanns fler dagar inom området jämfört med vandringskorna. Älgarna nyttjade brandfältet framförallt under vegetationsperioden (maj-okt/nov) där några rörde sig inom brandområdet medan många älgar främst rörde sig i ytterkanterna. Alla kor, förutom F1874, F1887 och F1924, kalvade och vid hälften av kalvningarna föddes tvillingkalvar. Medelkalvningsdagen var 18:e maj. Sommaröverlevnaden av de årskalvar som föddes under kalvningssäsongen 2021 var mellan 17 och 26% fram till jaktstarten och låg därmed högre än året innan då överlevnad låg mellan 13-17 %. Sommeröverlevnaden är betydligt lägre jämfört med områden utan större rovdjur. I studieområdet i Ljusdal utsätts årskalvar för predation framförallt av björn. För en tredjedel av kalvarna som försvann under sommaren kunde vi verifiera björnpredation genom fynd i fält och för ytterligare en tredje del misstänker vi predation. Vid vinterkoll efter jakten var överlevnaden 12%. Insamlingen av prover under jakten resulterade i ca 70 käkar och 20 kompletta reproduktionsorgan från hondjuren. Medelåldern hos de bedömda fällda hondjuren var 8.4 år och hos tjurar 4.4 år, och de respektive slaktvikterna låg på ca 188.0 och 201.0 kg. Slaktvikten för kalv låg i snitt på 71.5 kg. Fetthalten i benmärgen var i medel 81% för kor, 70% för tjurar och 74% för kalvar. En viktig orsak till att försökspopulationen i Ljusdal fungerar så bra är det nära samarbetet med alla intresserade. Intresset är mycket stort, många olika användare är inne på hemsidan www.slu.se/alg-forskning. Författarna ansvarar ensamma för innehållet i rapporten.
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Li, Chunding, et John Whalley. Rebalancing and the Chinese VAT : Some Numerical Simulation Results. Cambridge, MA : National Bureau of Economic Research, janvier 2011. http://dx.doi.org/10.3386/w16686.
Texte intégral
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Mietzner, Dana, Frank Hartmann, Klaus-Martin Melzer, Markus Vossel, Franziska Bautz et Henning Wiechers. Die Rolle von Wissenschaft und Innovation in der Flughafenumfeldregion : Herausforderungen und Perspektiven. Technische Hochschule Wildau, 2020. http://dx.doi.org/10.15771/twz_2020_1.
Texte intégralRésumé :
Mit der Eröffnung des Flughafens BER im Oktober 2020, dem Bau der Gigafactory von Tesla in Grünheide und der Microvast-Batteriefabrik in Ludwigsfelde beginnend im Sommer 2020 sind deutlich Signale für den Beginn einer neuen Phase der Entwicklung der Flughafenumfeldregion erkennbar. Konzeptionell begleitet wird dieser Prozess zunächst durch die Fortschreibung des Gemeinsamen Strukturkonzeptes der Flughafenregion. Sie wurde von der Kommunalen Arbeitsgemeinschaft Dialogforum Airport Berlin Brandenburg (KAG DF) im Jahr 2019 beauftragt und soll voraussichtlich im April 2021 abgeschlossen und bestätigt werden (vgl. Dialogforum-BER, 2020). Hinzu kommen die Grundlagenermittlung Verkehr Flughafenregion BER, die mit dem Bericht vom August 2019 abgeschlossen wurde, sowie der Dachmarkenprozess „Entwicklungsstrategie und Dachmarkenkonzeption für die Technologie- und Wissenschaftsregion Zeuthen – Wildau – Königs Wusterhausen“, der im Jahr 2019 begann und dessen Ergebnisse im Sommer 2020 veröffentlicht wurden. Schließlich beauftragte das Ministerium für Wissenschaft, Forschung und Kultur des Landes Brandenburg die Technische Hochschule Wildau Ende 2019 mit der Analyse der Flughafenumfeldregion BER, für die die Frage nach der Beschaffenheit und Ansätzen einer Stärkung des Wissenschafts- und Technologiepotenzials der Region leitend war. Mit der Analyse sollten die Perspektiven verschiedener Akteur/innen, insbesondere aus den Bereichen Wirtschaftspolitik und Wirtschaftsförderung sowie Wissenschaft, auf die Region erhoben, aktuelle Projekte gesichtet und der Stand von Entwicklungsvorhaben, die mit der Entwicklung der Region in Zusammenhang stehen, ermittelt werden.
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Kieslinger, Daniel, et Carolyn Hollweg. Newsletter Juni 2022. BVkE, EREV, Inklusion jetzt!, juin 2022. http://dx.doi.org/10.54953/wbeh8061.
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Unter dem Titel „Gemeinsam zum Ziel: Wir gestalten die inklusive Kinder- und Jugendhilfe“ fiel am 27. Juni 2022 der Startschuss für den Beteiligungsprozess zur Umsetzung der inklusiven Lösung im SGB VIII. Wir aus dem Projekt waren mit dabei und berichten Ihnen in diesem Newsletter von den heiß diskutierten Themen und wie es weitergeht. Außerdem lesen Sie ein Interview mit Friedhelm Peiffer von der Aktion Mensch Stiftung. Der Bericht über den Tag der Vielfalt, der am 14. Juni 2022 in Ummeln stattfand, nimmt sie mit in eine spannende Diskussion um Regeln und was das mit Inklusion zu tun hat und schließlich stellt sich die Hephata Diakonie mit Sitz in Schwalmstadt-Treysa vor. Wir wünschen Ihnen einen guten Start in den Sommer!
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Kurozumi, Takushi, Ryohei Oishi et Willem Van Zandweghe. Sticky Information Versus Sticky Prices Revisited : A Bayesian VAR-GMM Approach. Federal Reserve Bank of Cleveland, novembre 2022. http://dx.doi.org/10.26509/frbc-wp-202234.
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Several Phillips curves based on sticky information and sticky prices are estimated and compared using Bayesian VAR-GMM. This method derives expectations in each Phillips curve from a VAR and estimates the Phillips curve parameters and the VAR coefficients simultaneously. Quasi-marginal likelihood-based model comparison selects a dual stickiness Phillips curve in which, each period, some prices remain unchanged, consistent with micro evidence. Moreover, sticky information is a more plausible source of inflation inertia in the Phillips curve than other sources proposed in previous studies. Sticky information, sticky prices, and unchanged prices in each period are all needed to better describe inflation dynamics.
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Breitbarth, Marco, Anja Hentschel et Simon Kaser. Kunststoffeinträge von Kunstrasenplätzen in Entwässerungssystem - Aufkommen, Rahmenbedingungen und Möglichkeiten der Eintragsminderung. Sonderforschungsgruppe Institutionenanalyse, 2022. http://dx.doi.org/10.46850/sofia.9783941627994.
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Plastics as an environmental problem have been in the focus of science, politics and the public for a long time. Various sources and pathways have already been identified and a wide range of measures have been developed to reduce and, if possible, avoid inputs into the environment. Artificial grass pitches represent a special source of plastic inputs into the environment. Artificial grass with different infill materials has been widely used for some time now on surfaces for a wide range of sports, both amateur and professional. It is characterised by various advantages over natural grass. However, the use of artificial grass on sports surfaces also has its downsides, especially for the environment. On the one hand, the synthetic grass fibres themselves, which become detached through wear, are problematic. On the other hand, synthetic granulate is used as infill material on these pitches to reduce the risk of injury to players, to support the blades of artificial grass and to improve the playing characteristics of the field. However, this granulate can enter the environment in various ways - indirectly via drainage systems or directly. The following comments reflect research results from the InRePlast project. In the following chapter 2, the results of our own investigations on the topic are presented. In Chapter 3, these are compared to other publications and evaluated with regard to their significance. Chapter 4 is devoted to technical and organisational measures to reduce discharges as well as legal approaches to regulation. Finally, Chapter 5 draws a conclusion. Among other things, the study concludes that artificial grass pitches are less relevant as a specific source of plastic inputs than previously discussed. It should also be noted that the input into drainage systems via the collection of dirty water has a significantly higher relevance than the input via the collection of precipitation at the edge of the pitch and that measures should therefore focus on the carry-over on players' clothing and shoes.
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Morawska, Barbara. A nice Cycle Rule for Goal-Directed E-unification. Aachen University of Technology, 2004. http://dx.doi.org/10.25368/2022.138.
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In this paper we improve a goal-directed E-unification procedure by introducing a new rule, Cycle, for the case of collapsing equations, i.e. equations of the type x ≈ v where x ∈ Var (v). In the case of these equations some obviously unnecessary infinite paths of inferences were possible, because it was not known if the inference system was still complete if the inferences were not allowed into positions of x in v. Cycle does not allow such inferences and we prove that the system is complete. Hence we prove that as in other approaches, inferences into variable positions in our goal-directed procedure are not needed.
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MacArtney, John I., Joanna Fleming, Abi Eccles, Catherine Grimley, Helen Wesson, Catriona Mayland, Sarah Mitchell et al. Impact of Covid-19 pandemic on Hospices (ICoH) : Staff Cohort Report. University of Warwick Press, mai 2022. http://dx.doi.org/10.31273/978-1-911675-04-4.
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This report describes the diversity of experiences of hospice staff who worked in operational roles in hospices in the West Midlands during the Covid-19 pandemic. It is one of four cohort reports – the others focus on patients, carers, and senior managers respectively – that form the evidence base for a Policy Report into the impact of Covid-19 on hospices. In these reports we address the nine key themes that were identified as potentially important in our previous collaborative knowledge synthesis (MacArtney et al., 2021) and seek to address some of the policy gaps we identified in our review of recommendations for hospice practice and policy (van Langen-Datta et al., 2022). Together these outputs are the result of an Economic and Social Research Council funded study (grant number: ES/W001837/1). This is one of the first studies to contribute an in-depth exploration of hospice-based experiences of the pandemic to the growing body of knowledge about the effectiveness and effects of changes to hospice services, at regional and national levels in response to Covid-19. The aim of this report is therefore to explore the effects the Covid-19 pandemic had on the experiences of hospice staff as they sought to provide care and support to people with life-limiting conditions and those that cared for them so that we can identify recommendations for clinical practice and healthcare policy. Drawing on these findings, this report offers recommendations for hospices and clinicians who continue to provide care and support for people with life limiting conditions and those that care them during the ongoing pandemic. These recommendations will also be of interest to local commissioners who will need to work with hospices in their region to ensure informal carers receive the support they need, and national policymakers who will need to ensure the necessary resources and guidance are available.
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Boustati, Alma. The Advantages and Disadvantage of Double Taxation Agreements for Developing Countries. Institute of Development Studies, septembre 2022. http://dx.doi.org/10.19088/k4d.2022.143.
Texte intégralRésumé :
When a developing and a developed country sign Double Taxation Agreements (DTAs), its generally the case that the developing country is the one that forgoes some of its tax revenues (Braun & Fuentes, 2016). Nevertheless, developing countries enter these agreements on the assumption that this will have enough economic benefits to offset these losses (Neumayer, 2007). Besides alleviating the burden of double taxation, DTAs also have the added value of improving exchange of information, which helps combat tax evasion and avoidance (Barthel et al., 2009). One of the incentives for signing DTAs for developing countries is the increase in Foreign Direct Investments (FDIs) (Neumayer, 2007). The evidence from the literature on the link between signing DTAs and increasing FDIs is very mixed, with some finding a positive impact and others finding no impact (Quak & Timmis, 2018). However, the literature points to some clear factors that drive the relationship between FDIs and DTAs. There are also studies that attempt to quantify the tax revenue loss of developing countries when they enter DTAs. All the studies find substantial negative loss, although most do not account for the potential benefit of increased FDIs (ActionAid, 2016; IMF, 2014; Janský & Šedivý, 2018; McGauran, 2013; Van de Poel, 2016). There are also other reasons for why developing countries may still commit to negotiate and enter DTAs even when the benefits are not guaranteed. This includes increasing diplomatic ties with the treaty partner and the incentive of receiving foreign aid (Braun and Zagler, 2017). The other is a prisoner’s dilemma situation. The two most prevalent DTA conventions are the OECD Model and the UN Model. The UN Model tends to be more advantageous for developing countries compared to the OECD Model (Eyitayo-Oyesode, 2020). There are many issues over which the UN Committee’s expert members from developed and developing countries disagree but developed country member are better at influencing decisions. Finally, the OECD Model is updated more frequently, resulting in the UN one being comparatively out of date (Hearson, 2015; Quak & Timmis, 2018). Generally, the literature on the impact of DTAs on developing countries’ economies is extensive. This is especially the case for the impact of DTAs on FDIs as well as on tax revenue loss. However, because of the complexity of these issues, many of the empirical studies inevitably suffer from methodological issues that make conclusive claims very difficult. Notably missing from the literature is the impact of DTAs on international trade.
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Beck, Aaron. RiverOceanPlastic : Land-ocean transfer of plastic debris in the North Atlantic, Cruise No. AL534/2, 05 March – 26 March 2020, Malaga (Spain) – Kiel (Germany). GEOMAR Helmholtz Centre for Ocean Research Kiel, 2020. http://dx.doi.org/10.3289/cr_al534-2.
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Cruise AL534/2 is part of a multi-disciplinary research initiative as part of the JPI Oceans project HOTMIC and sought to investigate the origin, transport and fate of plastic debris from estuaries to the oceanic garbage patches. The main focus of the cruise was on the horizontal transfer of plastic debris from major European rivers into shelf regions and on the processes that mediate this transport. Stations were originally chosen to target the outflows of major European rivers along the western Europe coast between Malaga (Spain) and Kiel (Germany), although some modifications were made in response to inclement weather. In total, 16 stations were sampled along the cruise track. The sampling scheme was similar for most stations, and included: 1) a CTD cast to collect water column salinity and temperature profiles, and discrete samples between surface and seafloor, 2) sediment sampling with Van Veen grab and mini-multi corer (mini-MUC), 3) suspended particle and plankton sampling using a towed Bongo net and vertical WP3 net, and 4) surface neusten sampling using a catamaran trawl. At a subset of stations with deep water, suspended particles were collected using in situ pumps deployed on a cable. During transit between stations, surface water samples were collected from the ship’s underway seawater supply, and during calm weather, floating litter was counted by visual survey teams. The samples and data collected on cruise AL534/2 will be used to determine the: (1) abundance of plastic debris in surface waters, as well as the composition of polymer types, originating in major European estuaries and transported through coastal waters, (2) abundance and composition of microplastics (MP) in the water column at different depths from the sea surface to the seafloor including the sediment, (3) abundance and composition of plastic debris in pelagic and benthic organisms (invertebrates), (4) abundance and identity of biofoulers (bacteria, protozoans and metazoans) on the surface of plastic debris from different water depths, (5) identification of chemical compounds (“additives”) in the plastic debris and in water samples.