995 resultados para shortage problem
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This paper re-addresses the issue of a lacking genuine design research paradigm. It tries to sketch an operational model of such a paradigm, based upon a generic design process model, which is derived from basic notions of evolution and learning in different domains of knowing (and turns out to be not very different from existing ones). It does not abandon the scientific paradigm but concludes that the latter has to be embedded into / subordinated under a design paradigm.
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Quasi-molecular X-rays observed in heavy ion collisions are interpreted within a relativistic calculation of correlation diagrams using the Dirac-Slater model. A semiquantitative description of noncharacteristic M X rays is given for the system Au-I.
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The aim of this paper is the numerical treatment of a boundary value problem for the system of Stokes' equations. For this we extend the method of approximate approximations to boundary value problems. This method was introduced by V. Maz'ya in 1991 and has been used until now for the approximation of smooth functions defined on the whole space and for the approximation of volume potentials. In the present paper we develop an approximation procedure for the solution of the interior Dirichlet problem for the system of Stokes' equations in two dimensions. The procedure is based on potential theoretical considerations in connection with a boundary integral equations method and consists of three approximation steps as follows. In a first step the unknown source density in the potential representation of the solution is replaced by approximate approximations. In a second step the decay behavior of the generating functions is used to gain a suitable approximation for the potential kernel, and in a third step Nyström's method leads to a linear algebraic system for the approximate source density. For every step a convergence analysis is established and corresponding error estimates are given.
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The paper will consist of three parts. In part I we shall present some background considerations which are necessary as a basis for what follows. We shall try to clarify some basic concepts and notions, and we shall collect the most important arguments (and related goals) in favour of problem solving, modelling and applications to other subjects in mathematics instruction. In the main part II we shall review the present state, recent trends, and prospective lines of development, both in empirical or theoretical research and in the practice of mathematics instruction and mathematics education, concerning problem solving, modelling, applications and relations to other subjects. In particular, we shall identify and discuss four major trends: a widened spectrum of arguments, an increased globality, an increased unification, and an extended use of computers. In the final part III we shall comment upon some important issues and problems related to our topic.
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The paper will consist of three parts. In part I we shall present some background considerations which are necessary as a basis for what follows. We shall try to clarify some basic concepts and notions, and we shall collect the most important arguments (and related goals) in favour of problem solving, modelling and applications to other subjects in mathematics instruction. In the main part II we shall review the present state, recent trends, and prospective lines of development, both in empirical or theoretical research and in the practice of mathematics instruction and mathematics education, concerning (applied) problem solving, modelling, applications and relations to other subjects. In particular, we shall identify and discuss four major trends: a widened spectrum of arguments, an increased globality, an increased unification, and an extended use of computers. In the final part III we shall comment upon some important issues and problems related to our topic.
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'The problem of the graphic artist' is a small example of applying elementary mathematics (divisibility of natural numbers) to a real problem which we ourselves have actually experienced. It deals with the possibilities for partitioning a sheet of paper into strips. In this contribution we report on a teaching unit in grade 6 as well as on informal tests with students in school and university. Finally we analyse this example methodologically, summarise our observations with pupils and students, and draw some didactical conclusions.
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Cubicle should provide good resting comfort as well as clean udders. Dairy cows in cubicle houses often face a restrictive environment with regard to resting behaviour, whereas cleanliness may still be impaired. This study aimed to determine reliable behavioural measures regarding resting comfort applicable in on-farm welfare assessments. Furthermore, relationships between cubicle design, cow sizes, management factors and udder cleanliness (namely teats and teat tips) were investigated. Altogether 15 resting measures were examined in terms of feasibility, inter-observer reliability (IOR) and consistency of results per farm over time. They were recorded during three farm visits on farms in Germany and Austria with cubicle, deep litter and tie stall systems. Seven measures occurred to infrequently to allow reliable recording within a limited observation time. IOR was generally acceptable to excellent except for 'collisions during lying down', which only showed good IOR after improvement of the definition. Only three measures were acceptably repeatable over time: 'duration of lying down', 'percentage of collisions during lying down' and 'percentage of cows lying partly or completely outside lying area'. These measures were evaluated as suitable animal based welfare measures regarding resting behaviour in the framework of an on-farm welfare assessment protocol. The second part of the thesis comprises a cross-sectional study on resting comfort and cow cleanliness including 23 Holstein Friesian dairy herds with very low within-farm variation in cubicle measures. Height at withers, shoulder width and diagonal body length were measured in 79-100 % of the cows (herd size 30 to115 cows). Based on the 25 % largest animals, compliance with recommendations for cubicle measures was calculated. Cleanliness of different body parts, the udder, teats and teat tips was assessed for each cow in the herd prior to morning milking. No significant correlation was found between udder soiling and teat or teat tip soiling on herd level. The final model of a stepwise regression regarding the percentage of dirty teats per farm explained 58.5 % the variance and contained four factors. Teat dipping after milking which might be associated with an overall clean and accurate management style, deep bedded cubicles, increasing cubicle maintenance times and decreasing compliance concerning total cubicle length predicted lower teat soiling. The final model concerning teat tip soiling explained 46.0 % of the variance and contained three factors. Increasing litter height in the rear part of the cubicle and increased alley soiling which is difficult to explain, predicted for less soiled teat tips, whereas increasing compliance concerning resting length was associated with higher percentages of dirty teat tips. The dependent variable ‘duration of lying down’ was analysed using again stepwise regression. The final model explained 54.8 % of the total variance. Lying down duration was significantly shorter in deep bedded cubicles. Further explanatory though not significant factors in the model were neck-rail height, deep bedding or comfort mattresses versus concrete floor or rubber mats and clearance height of side partitions. In the attempt to create a more comprehensive lying down measure, another analysis was carried out with percentage of ‘impaired lying down’ (i.e. events exceeding 6.3 seconds, with collisions or being interrupted) as dependent variable. The explanatory value of this final model was 41.3 %. An increase in partition length, in compliance concerning cubicle width and the presence of straw within bedding predicted a lower proportion of impaired lying down. The effect of partition length is difficult to interpret, but partition length and height were positively correlated on the study farms, possibly leading to a bigger zone of clear space for pelvis freedom. No associations could be found between impaired lying down and teat or teat tip soiling. Altogether, in agreement with earlier studies it was found that cubicle dimensions in practice are often inadequate with regard to the body dimensions of the cows, leading to high proportions of impaired lying down behaviour, whereas teat cleanliness is still unsatisfactory. Connections between cleanliness and cow comfort are far from simplistic. Especially the relationship between cubicle characteristics and lying down behaviour apparently is very complex, so that it is difficult to identify single influential factors that are valid for all farm situations. However, based on the results of the present study the use of deep bedded cubicles can be recommended as well as improved management with special regard to cubicle and litter maintenance in order to achieve both better resting comfort and teat cleanliness.
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Nachdem sich in der Kolonialkrise von 1906 das Scheitern der ersten Periode deutscher Kolonialherrschaft (1885-1906) offenbarte, wurde Bernhard Dernburg die grundlegende Reorganisation der Kolonialpolitik anvertraut. Als Mann aus der Welt der Banken und Finanzen sollte er die stagnierende Entwicklung der Kolonien mit Hilfe von administrativen und wirtschaftlichen Reformmaßnahmen vorantreiben und gleichzeitig der indigenen Bevölkerung eine humane Behandlung zu garantieren. Um diese Ziele zu erreichen, verabschiedete er Reformen, die eine Rationalisierung und Humanisierung der Arbeiterpolitik vorsahen. Sowohl in der zeitgenössischen Literatur als auch in der aktuellen wissenschaftlichen Forschung wird der Amtsantritt Bernhard Dernburgs zum Leiter der Kolonialabteilung im Jahre 1906 als der „Beginn einer neuen humanen Ära“ deutscher Kolonialpolitik oder als „Wandel zum Besseren“ bezeichnet. Die Dissertation „Schwarzer Untertan versus Schwarzer Bruder. Bernhard Dernburgs Reformen in den Kolonien Deutsch-Ostafrika, Deutsch-Südwestafrika, Togo und Kamerun“ untersucht die Intention, Akzeptanz, Umsetzung und Auswirkung der reformatorischen Eingeborenenpolitik und klärt, ob die Beurteilung der Ära Dernburg (1906-1910) in der zeitgenössischen und aktuellen Forschung eine Berechtigung hat. Obwohl zumindest in der Theorie sein Konzept einer rationalen und humanen Kolonialpolitik sicherlich eine Abkehr von der bisher betriebenen Kolonialpolitik bedeutete, zeigt sich jedoch bei der Umsetzung der Reformen eine deutliche Diskrepanz zwischen Intention und Realität. Auch wenn zumindest die Bestrebung Dernburgs zur Verrechtlichung der indigenen Arbeitsverhältnisse gewürdigt werden sollte, so muss doch konstatiert werden, dass es in der „Ära Dernburg“ definitiv nicht zu einer grundlegenden Verbesserung der indigenen Lebenssituation in den deutschen Kolonien kam. Im Gegenteil, die Dernburgsche Reformpolitik beschleunigte vielmehr den Verelendungsprozess der indigenen Bevölkerung. In allen afrikanischen Kolonien verschlechterten sich mit der Intensivierung der Verwaltung die sozialen und menschlichen Beziehungen zwischen Afrikanern und Europäern. Vieles von dem, was Dernburg in seinem Programm propagierte, konnte nicht erreicht werden. Zwar führte Dernburg in Deutsch-Ostafrika, Deutsch-Südwestafrika und in Kamerun eine rechtlich bindende Arbeiterverordnung ein, jedoch unterschieden sich die Bestimmungen zum Teil erheblich voneinander, so dass von einer einheitlichen Modernisierung des kolonialen Arbeitsrechts nicht die Rede sein kann. Viele arbeitsrechtliche Bereiche, wie z.B. die Arbeiteranwerbung, Lohnzahlung, Minderjährigenschutz, Vertragsdauer, Arbeitszeit, Verpflegung und Unterkunft wurden nur unzureichend geregelt. Ähnlich negativ muss auch die Reformierung der Strafrechtspflege bewertet werden. Die Kodifizierung eines Eingeborenenstrafrechts scheiterte sowohl am Widerstand der lokalen Verwaltung als auch am Grundkonsens der Rechtmäßigkeit einer Rassenjustiz. Kolonialpolitik war auch in der „Ära Dernburg“ nichts anderes als „rohe Ausbeutungspolitik“, die zur Lösung der Arbeiterfrage beitragen sollte. Aber gerade hier, bei der Mobilisierung von afrikanischen Lohnarbeitern, war der Kolonialstaatssekretär nicht etwa mit einer „Arbeiterfürsorgepolitik“, sondern mit der Fortführung der Enteignungs- und Zwangsmaßnahmen erfolgreich gewesen. Insgesamt ist ein deutlicher Anstieg an afrikanischen Arbeitern in europäischen Unternehmen zu verzeichnen, was darauf schließen lässt, dass Dernburgs Verordnungen einen günstigen Einfluss auf die Arbeiterfrage ausgeübt haben. Obwohl nicht von einem grundlegenden Neuanfang der Kolonialpolitik gesprochen werden kann, sollte ebenso wenig bezweifelt werden, dass sich die deutsche Kolonialpolitik nicht unter Dernburg veränderte. Größere indigene Aufstände und Unruhen blieben aus, so dass während seiner Amtszeit eine systematische wirtschaftliche Erschließung der Kolonien beginnen konnte.
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This study investigated the relationship between higher education and the requirement of the world of work with an emphasis on the effect of problem-based learning (PBL) on graduates' competencies. The implementation of full PBL method is costly (Albanese & Mitchell, 1993; Berkson, 1993; Finucane, Shannon, & McGrath, 2009). However, the implementation of PBL in a less than curriculum-wide mode is more achievable in a broader context (Albanese, 2000). This means higher education institutions implement only a few PBL components in the curriculum. Or a teacher implements a few PBL components at the courses level. For this kind of implementation there is a need to identify PBL components and their effects on particular educational outputs (Hmelo-Silver, 2004; Newman, 2003). So far, however there has been little research about this topic. The main aims of this study were: (1) to identify each of PBL components which were manifested in the development of a valid and reliable PBL implementation questionnaire and (2) to determine the effect of each identified PBL component to specific graduates' competencies. The analysis was based on quantitative data collected in the survey of medicine graduates of Gadjah Mada University, Indonesia. A total of 225 graduates responded to the survey. The result of confirmatory factor analysis (CFA) showed that all individual constructs of PBL and graduates' competencies had acceptable GOFs (Goodness-of-fit). Additionally, the values of the factor loadings (standardize loading estimates), the AVEs (average variance extracted), CRs (construct reliability), and ASVs (average shared squared variance) showed the proof of convergent and discriminant validity. All values indicated valid and reliable measurements. The investigation of the effects of PBL showed that each PBL component had specific effects on graduates' competencies. Interpersonal competencies were affected by Student-centred learning (β = .137; p < .05) and Small group components (β = .078; p < .05). Problem as stimulus affected Leadership (β = .182; p < .01). Real-world problems affected Personal and organisational competencies (β = .140; p < .01) and Interpersonal competencies (β = .114; p < .05). Teacher as facilitator affected Leadership (β = 142; p < .05). Self-directed learning affected Field-related competencies (β = .080; p < .05). These results can help higher education institution and educator to have informed choice about the implementation of PBL components. With this information higher education institutions and educators could fulfil their educational goals and in the same time meet their limited resources. This study seeks to improve prior studies' research method in four major ways: (1) by indentifying PBL components based on theory and empirical data; (2) by using latent variables in the structural equation modelling instead of using a variable as a proxy of a construct; (3) by using CFA to validate the latent structure of the measurement, thus providing better evidence of validity; and (4) by using graduate survey data which is suitable for analysing PBL effects in the frame work of the relationship between higher education and the world of work.