Explore the vast range of titles available.

Fokussiert wird in ADIL die Trias aus erwachsener Interaktionsperson (eIP), Kind und unterschiedlich sprachlich strukturierten Büchern. Dabei sollen Gelingensbedingungen adaptiven dialogischen Lesens (DL) anhand von Videoanalysen identifiziert werden. Um das adaptive DL in die Praxis zu transferieren, werden Studierende geschult und bei der Umsetzung an unterschiedlichen Lernorten begleitet. Evaluiert wird die Maßnahme formativ (Feedback der Studierenden und eIP an den Lernorten) und summativ (Analyse der Förderkompetenzen der Studierenden sowie der grammatischen Kompetenzen der Kinder). Maßnahmen zur Implementierung (z. B. Online-Plattform mit Diagnostik-/ Fördermaterialien) werden entwickelt. (DIPF/Orig.). ADIL focuses on the triad of adult interaction person, child and differently linguistically structured children's books. The aim is to identify conditions for the success of adaptive dialogic reading on the basis of video analyses. In order to transfer adaptive dialogic reading into practice, students are trained and accompanied in the implementation at different learning locations. The intervention is evaluated formatively (feedback from students and adult interaction person at the learning locations) and summatively (analysis of the students' support skills and the children's grammatical skills). Tools for implementation (e.g., online platform with diagnostic/support materials) are being developed. (DIPF/Orig.).

Sheet metal parts are widely used in the assembly of aircraft. The most common method of assembling sheet metal parts is through riveting. Failure of a rivet can have severe consequences in terms of loss of human lives and money. There are many parameters associated with a riveting process that directly affect the quality of rivets including squeeze force, rivet length, rivet diameter, and hole diameter tolerance. Incorrect selection or variations in these parameters could induce excessive residual stresses that result in stress concentration sites and initiate cracks, and also result in improper rivet head deformation leading to loose rivets. This paper presents a study of the effect of the aforementioned riveting parameters on the quality of a formed rivet using finite element simulation. The study was part of a larger project carried out for the local aircraft industry and hence, uses the inch system. The research is conducted on a 1/8″ (0.125″) diameter rivet and a 0.064″ thick aluminum sheet. The results indicate that under normal variations in the riveting process parameters, when using the recommended countersunk depth of 0.042″ for rivet hole, most rivets that are formed will not meet the quality requirements. This is primarily due to the existence of a gap between the formed rivet and the hole. Decreasing the countersunk depth to 0.032″ allows for a higher range of hole and rivet diameter tolerances, as well as an increase in the range of squeeze force that can be applied without violating the quality requirements.

Als Prinzip für die Herstellung und Legitimation sozialer Ordnung gilt Meritokratie entweder als normativer Maßstab moderner Gesellschaften oder als eine von der Empirie sozialer Ungleichheiten laufend widerlegte Ideologie. Der Beitrag wählt einen anderen Ausgangspunkt und widmet sich den Herausforderungen der konkreten Umsetzung des abstrakten Leistungsprinzips. Anhand von Berufungsakten zu 145 Berufungsverfahren aus der zweiten Hälfte des 20. Jahrhunderts wird ein spezifisches Problem rekonstruiert: Meritokratie ist in Berufungsverfahren nicht das einzige Prinzip zur Herstellung und Legitimation sozialer Ordnung. Die Besetzung von Professuren ist nicht nur an der Bestenauslese, sondern auch an der sozialen Passung von Kandidatinnen und Kandidaten orientiert. In der Praxis entsteht so das Ordnungsproblem, die Orientierung an Leistung mit der Orientierung an sozialer Passung zu vereinbaren. Der Beitrag zeigt, erstens, dass dieses Problem überhaupt erst entsteht, als das meritokratische Prinzip in den 1970er-Jahren so verbindlich wird, dass Leistungszuschreibungen die alleingültige Rechtfertigung für Berufungsentscheidungen sind. Zweitens wird herausgearbeitet, wie Gutachterinnen und Gutachter und Kommissionen mit diesem Ordnungsproblem umgehen und die meritokratische Bestenauslese in Berufungsverfahren mit der sozialen Passung von Kandidatinnen und Kandidaten vereinbaren. Der Beitrag trägt zu einem differenzierteren Verständnis des Leistungsprinzips bei, indem er praktische Probleme bei der konkreten Umsetzung des meritokratischen Prinzips beleuchtet.

This paper presents the basis of loaded tooth contact analysis and predicts the influence of assembly errors on localised contact stress distribution in single enveloping (cylindrical) worm gearing during a meshing cycle. A method for loaded tooth contact analysis, geometry and kinematics of such gear pairs is developed. The method accounts for the effects of tooth composite deflection caused by bending, shearing, foundation, tooth contact deformation and initial profile separation due to assembly errors. The method includes the determination of contact lines, load and stress distribution due to assembly errors. Because of the complex geometry of worm gear teeth, the tooth bending stiffness is calculated using the slicing technique developed earlier by the authors. Classical Hertz theory is used for calculating contact stress and deformation. A computer program based on the presented method has been developed and used to study the influence of errors on mating teeth contact. It is shown that the governing factors in loaded gears with assembly error are the mesh stiffness and the amount of error which is linked to load sharing between adjacent tooth pairs. A numerical example is presented to further clarify the outlined method.

Context: Following the social cognitive career theory of Lent, Brown, and Hackett (1994), the current study examines the effect of role models' professions and practical internship experiences on the choice of professional environment independent of professional interests. Embedded in the Swiss context with its strong vocational training system, the paper outlines to what extent the desired professional environment is realized in the chosen apprenticeship two years later and how this realization can be predicted. The theoretical model proposes that students form direct professional experiences during their first internship(s). If those experiences are positive, students choose an apprenticeship in the same professional environment. Students have indirect (vicarious) professional experiences through their role models. If those experiences are positive, students choose an apprenticeship in the role model's professional environment. The study examined whether, independent of professional interests, direct experiences in internships and indirect experiences through role models' professions predict the realization of a desired professional environment in an apprenticeship. Method: The longitudinal sample consists of N = 348 seventh- and ninth-grade students from four German-speaking Swiss cantons. Professional interests and environments were measured using standardized questionnaires. The professional environments of the desired professions, the chosen apprenticeships, the role model's professions, and the internship's professions were coded using Holland's (1997) interest types: realistic, investigative, artistic, social, enterprising, and conventional (RIASEC). Results: In 53% of the cases, students chose an apprenticeship in the professional environment they desired. In 53% of the cases, the chosen professional environment corresponded with the professional environment of the student's two most important role models. In 39% of the cases, those role models were their parents. By means of logistic regression analyses, we can show that role models' professional environments and the professional environment of the first internship influenced the realization of the desired professional environment at the end of lower secondary school, independent of the effect of the individuals' interests. Conclusions: Results show that direct professional experiences in internships and indirect experiences of role models influence the realization of the desired professional environment, independent of professional interests. In a contextual approach, career counselling should include the role model's profession and how it corresponds with the client's interests and professional desires. Moreover, role models, especially parents, have a responsibility to reflect on how their goals influence students' career choice processes.

Realistische Erwartungen und Passung zwischen Interessen und Studieninhalten sind zentrale Ansatzpunkte bei der Steuerung von Studienwahlentscheidungen. In einem neu entwickelten fachspezifischen Erwartungs- und Interessenstest (E × I - Test) für Psychologie werden erstmals Erwartungsdiskrepanzen und Interessen kombiniert betrachtet und dementsprechend auch übertroffene oder enttäuschte Erwartungen erfasst und rückgemeldet. Die zu den Studieninhalten des neuen Verfahrens entwickelten Items konnten annähernd perfekt den Studienfachbereichen zugeordnet werden und deckten diese weitgehend vollständig und gleichmäßig ab. 2,033 Studieninteressierte bearbeiteten den E × I - Test im Rahmen eines Online-Self-Assessments und fühlten sich danach informierter als vorher. Insgesamt bewerteten die Studieninteressierten das neue Verfahren positiv und 94% würden es weiterempfehlen. Auf Basis des vorgestellten Verfahrens für das Bachelor-Psychologiestudium könnten weitere E × I - Tests für die Orientierung in andere Studienfächer oder Berufe entwickelt und validiert werden, für welche sowohl spezifische Interessen als auch enttäuschte Erwartungen eine Rolle spielen. (DIPF/Orig.). Both, realistic expectations and fit between interests and study content are crucial to guide study choice decisions. A newly developed subject-specific Expectation-Interest Test (E × I - Test) for psychology considers, for the first time, expectation discrepancies and interests in combination. Thus, exceeded or disappointed expectations are assessed and reported back. It was shown that the newly developed items which represent study contents can be assigned almost perfectly to the study subject areas and cover them to a large extent completely and evenly. 2,033 prospective students completed the E × I - Test as part of an online self-assessment and felt more informed afterwards than before. Overall, prospective students rated the new procedure positively and 94% would recommend it to others. Based on the presented procedures for the bachelor psychology studies, further E × I - Tests could be developed and validated for orientation to other fields of study or professions, for which both specific interests and disappointed expectations play a role. (DIPF/Orig.).

Nowadays tolerance optimization is increasingly becoming an important tool for manufacturing and mechanical design. This seemingly, arbitrary task of assigning dimension tolerance can have a large effect on the cost and performance of manufactured products. With the increase in competition in today’s market place, small savings in cost or small increase in performance may determine the success of a product. In practical applications, tolerances are most often assigned as informal compromises between functional quality and manufacturing cost. Frequently the compromise is obtained interactively by trial and error. A more scientific approach is often desirable for better performance. In this paper particle swarm optimization (PSO) is used for the optimal machining tolerance allocation of over running clutch assembly to obtain the global optimal solution. The objective is to obtain optimum tolerances of the individual components for the minimum cost of manufacturing. The result obtained by PSO is compared with the geometric programming (GP) and genetic algorithm (GA) and the performance of the result are analyzed .

Abstract Surface roughness tests were performed on computer numerical controlled (CNC) incrementally formed sheet metal parts using various tool depth increments and spindle speeds. A non-contact method using white light interferometry was selected to avoid scratching the material surface. All parts were formed from annealed Al 3003 sheet to a shape with a flat 45° wall section for testing. A relationship was defined between peak-to-valley roughness and depth increment, which was then compared to theory for shear forming. The surface quality of modern incremental methods and shear forming was shown to depend on similar settings, and the defined relationship allows for knowledgeable control of surface roughness in future work on such applications as reflective surfaces.

For precise industrial applications, a manipulator must have high positioning accuracy and repeatability. However, variations in performance of the manipulator are attributed to improper selection of dimensions of design and process parameters and its tolerance. There have been almost no attempts to optimize these parameters and tolerance of the manipulator, by which performance variations will be minimum. This paper presents an offline approach to select optimal parameters and tolerance simultaneously which minimizes the manufacturing cost and delivers the target performance level. To determine the optimal parameters and tolerances, a modification in differential evolution algorithm is proposed, which helps in incorporating the effect of uncertainty in optimization process. Proposed approach has been illustrated by selecting optimal parameters and tolerance of a 2-DOF RR planar manipulator. The performance of this approach has been compared with modified genetic algorithm. It is observed that differential evolution algorithm provides optimal results with lesser computations compared to genetic algorithm.

This paper presents a matrix approach coupled to the notion of constraints for the representation of tolerance zones within CAD/CAM (computer-aided design and manufacture) systems. The proposed theory, reproduces themeasurable ornon-invariant displacements associated with various types of tolerance zone. This is done using the homogeneous transforms commonly associated with robotic modelling.This matrix representation is completed by a set of inequalities defining the bounds of the tolerance zones. Moreover, the generation of the model and its mathematical definition allows for its use in the representation of clearances and for the computation of tolerance transfer. An example illustrates the application of the model to a simplified gear pump mechanism.