Geothermische Stromerzeugung in Deutschland — Stiefkind oder schlafender Riese?

This contribution analyses the development of power generation from geothermal energy in Germany. It considers research funding schemes, the support through the german Renewable Energy Sources Act (EEG) and the role of decisive actors as well as technical, economic and societal framework conditions. Compared to other renewable energy sources research funding for geothermal energy had played an inferior role in the past. After the potentials for geothermal power generation had been underlined by a study in 2003, geothermal power gained more political and institutional advocates. Subsequently it was equipped with a higher tariff in the EEG 2004 and led to realization of demonstration projects. Yet, the appliance of technologies for electrical power transformation, ORC and Kalina, are at the very beginning. Presently, the geothermal energy industry consists of a small amount of medium-sized businesses. Regional and nationwide energy providers, acting as operators and investors, do not exert much pressure in view of limited returns. Despite the compatibility with existing power supply systems, constraints to the expansion of geothermal energy use — above all exploration risks and high drilling costs- are likely to lead to a step-by step enhancement rather than a rush.     

Representations of technology in the “Technical Stories” for children of Otto Witt, early 20th century Swedish technology educator

Children’s fiction in school libraries have played and still play a role in mediating representations of technology and attitudes towards technology to schoolchildren. In early 20th century Sweden, elementary education, including textbooks and literature that were used in teaching, accounted for the main mediation of technological knowledge to schoolchildren. An investigation of children’s literature for schools is therefore important in order to understand what was considered worth knowing about technology at the time. The aim of this article is therefore to analyse the representations of technology and attitudes towards technology that were mediated through two children’s fiction books in Swedish elementary school libraries in the 1910s. We have limited the analysis of empirical material to the books Technical Stories for Young and Old (Tekniska sagor för stora och små, 1914) and Technical Stories of the War for Young and Old (Krigets tekniska sagor för stora och små, 1915) by the Swedish inventor, author and technology educator Otto Witt. Gauging Witt’s influence on the schoolchildren and educators of his time is very difficult, but in this first English-language article on his “technical stories” one can conclude that he was in many ways unique and probably fairly well-read in the schools of early 20th century Sweden and onward. He was also a particularly perceptive forerunner of today’s technology and science educators in his use of anthropomorphism as an educational tool.     

Je innovativer, desto erfolgreicher?

Zusammenfassung Innovationsgrad und Innovationserfolg sind die strategischen Ziel- und Resultatsgrössen des Innovationsmanagements. Es bestehen Zweifel, ob zwischen beiden Grössen ein linearer positiver Zusammenhang besteht. Dieser Zweifel lässt sich nicht nur theoretisch begründen. Er wird auch durch die vorliegenden empirischen Befunde genährt. Es kann aber auch nicht ausgeschlossen werden, dass die Nicht- und Negativ-Befunde zur Beziehung von Innovationsgrad und Innovationserfolg auf methodische Defizite zurückzuführen sind. Die weitere Forschung hat diese theoretischen Erwägungen und methodischen Einwände zu berücksichtigen. Wir schlagen überdies vor, die Einzelprojektanalyse durch eine Portfolioanalyse zu ergänzen. JEL classifications O31, O32     

Technical skill bias as a response of firms to unemployment: A matching model with applicant ranking and endogenous skill requirements

This paper considers an economy with heterogeneous workers where identical firms optimally decide on the degree of complexity of jobs. Meetings are depicted by an urn-ball process where firms rank their applicants and pick the best one. We show that a general rise in unemployment induces an increase in the employment shares of high-skilled workers which, in turn, makes firms choose more complex jobs, leading then to a decrease in the output of low-skilled workers. The technical skill bias is therefore related to the usual explanations of unemployment. Next, we state that a decentralized equilibrium is efficient in terms of job complexity but inefficient in terms of job creation when firms internalize the usual congestion effect. We then extend the analysis to a dynamic model.     

Duration of maternity leave in Germany: A case study of nonparametric hazard models and penalized splines

The paper investigates maternity leave behavior in West Germany for females being employed between 1995 and 2006 using data from the German Socio Economic Panel. The observational study focuses on the investigation of individual and family-related covariate effects on the duration of maternity leave following first or second childbirth, respectively. Dynamic duration time models are used in which covariate effects are allowed to vary smoothly with duration of being in maternity leave. The intention of the paper is to demonstrate with state of the art models how effects of covariables change over time and to analyse substantial differences between maternity leaves following first and second childbirth. Particularly the personal income of mothers and the educational attainment influence the decision when to return into employment. The leave period following second birth is influenced by the mothers' attachment to the labour market between their two maternity leave periods. As fitting routine penalized spline smoothing effects is employed using available software in R (http://www.r-project.org).     

Regional rigidities in the process of economic structural development

This paper outlines a framework for a vintage type analysis of structural change in production systems. By focusing on the existing industrial establishments in a region, rigidities are described with regard to (i) production techniques and input requirements, (ii) the semi-fixed location of the labour force and its specific set of production skills, (iii) the existing patterns of intersectoral deliveries. A scenario technique, utilizing programming models, is suggested as a method to study the effects on structural change of such rigidities.     

Simple aggregation and disaggregation subject to minimal information loss and other criteria

The main purpose of this paper is to develop a method and an algorithm for the aggregation as well as disaggregation of n-way tables, thereby minimizing a set of suitable criteria. One should observe that there is no real difference between aggregation and disaggregation when using this method. Here are presented some basic facts about a mainly one-dimensional method and an outline showing how the method may be extended to more complex cases.