@article{SocherPratiBochetal.2012, author = {Socher, Stephanie A. and Prati, Daniel and Boch, Steffen and M{\"u}ller, J{\"o}rg and Klaus, Valentin H. and H{\"o}lzel, Norbert and Fischer, Markus}, title = {Direct and productivity-mediated indirect effects of fertilization, mowing and grazing on grassland species richness}, series = {The journal of ecology}, volume = {100}, journal = {The journal of ecology}, number = {6}, publisher = {Wiley-Blackwell}, address = {Hoboken}, issn = {0022-0477}, doi = {10.1111/j.1365-2745.2012.02020.x}, pages = {1391 -- 1399}, year = {2012}, abstract = {Recent declines in biodiversity have given new urgency to questions about the relationship between land-use change, biodiversity and ecosystem processes. Despite the existence of a large body of research on the effects of land use on species richness, it is unclear whether the effects of land use on species richness are principally direct or indirect, mediated by concomitant changes in ecosystem processes. Therefore, we compared the direct effects of land use (fertilization, mowing and grazing) on species richness with indirect ones (mediated via grassland productivity) for grasslands in central Europe. We measured the richness and above-ground biomass in 150 grassland plots in 3 regions of Germany (the so-called Biodiversity Exploratories). We used univariate and structural equation models to examine direct and indirect land-use effects. The direct effects of mowing (-0.37, effect size) and grazing (0.04) intensity on species richness were stronger compared with the indirect effects of mowing (-0.04) and grazing (-0.01). However, the strong negative effect of fertilization (-0.23) on species richness was mainly indirect, mediated by increased productivity compared with the weak direct negative effect (-0.07). Differences between regions in land-use effects showed five times weaker negative effects of mowing (-0.13) in the region with organic soils (Schorfheide-Chorin), strong overall negative effects of grazing (-0.29) for the region with organic soils opposed to a similar strong positive effect (0.30) in the Hainich-Dun region, whereas the Schwabische Alb region displayed a five times weaker positive effect (0.06) only. Further, fertilization effects on species richness were positive (0.03) for the region with organic soils compared to up to 25 times stronger negative effects in the other two regions. Synthesis. Our results clearly show the importance of studying both direct and indirect effects of land-use intensity. They demonstrate the indirect nature, via productivity, of the negative effect of fertilization intensity on plant species richness in the real-world context of management-induced gradients of intensity of fertilization, mowing and grazing. Finally, they highlight that careful consideration of regional environments is necessary before attempting to generalize land-use effects on species diversity.}, language = {en} } @misc{Schoenefeld, type = {Master Thesis}, author = {Sch{\"o}nefeld, Romina}, title = {Produktivit{\"a}t und Akzeptanz von Wortbildungsmustern bei Neologismen der 2000er Jahre}, doi = {10.25932/publishup-43685}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-436853}, school = {Universit{\"a}t Potsdam}, pages = {vi, 141}, abstract = {Das Ziel der vorliegenden Masterarbeit ist es, die Interaktion zwischen der Produktivit{\"a}t und der Akzeptanz von Wortbildungsmustern sowie ihre m{\"o}gliche Lexikalisierung zu zeigen. Es soll gekl{\"a}rt werden, wie die Produktivit{\"a}t von Wortbildungsmustern die Akzeptanz von Neologismen beeinflusst und inwiefern die Produktivit{\"a}t der gebildeten Neuw{\"o}rter zu ihrer Lexikalisierung beitr{\"a}gt. Dazu wurden in den 2000er Jahren im Deutschen aufgekommene Neologismen der Bereiche Bildung \& Gesellschaft, Politik, Technik sowie Wirtschaft untersucht. Es wurde angenommen, dass ein neu gebildetes Wort durch die Sprecher eher akzeptiert wird, wenn dieses modellgerecht gebildet wurde. Dies bef{\"o}rdert wiederum die Lexikalisierung, d. h. die Aufnahme des Neologismus in den Allgemeinwortschatz. Es konnte gezeigt werden, dass die betrachteten Neologismen vorwiegend nach produktiven und regul{\"a}ren Mustern gebildet wurden. Die Ergebnisse konnten die Annahmen folglich best{\"a}tigen: Neue Wortbildungen bzw. deren Etablierung und m{\"o}gliche Lexikalisierung sowie ihre Akzeptanz h{\"a}ngen von der Produktivit{\"a}t ihrer Struktur ab. Weiterf{\"u}hrende Forschung k{\"o}nnte sich mit Aspekten des Verstehensaufwands sowie mit Verarbeitungsstrategien bei der Lexikalisierung von Neologismen besch{\"a}ftigen.}, language = {de} } @misc{RolinskiRammigWalzetal.2014, author = {Rolinski, Susanne and Rammig, Anja and Walz, Ariane and von Bloh, Werner and van Oijen, M. and Thonicke, Kirsten}, title = {A probabilistic risk assessment for the vulnerability of the European carbon cycle to weather extremes}, series = {Postprints der Universit{\"a}t Potsdam : Mathematisch naturwissenschaftliche Reihe (487)}, journal = {Postprints der Universit{\"a}t Potsdam : Mathematisch naturwissenschaftliche Reihe (487)}, number = {487}, issn = {1866-8372}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-407999}, pages = {1813 -- 1831}, year = {2014}, abstract = {Extreme weather events are likely to occur more often under climate change and the resulting effects on ecosystems could lead to a further acceleration of climate change. But not all extreme weather events lead to extreme ecosystem response. Here, we focus on hazardous ecosystem behaviour and identify coinciding weather conditions. We use a simple probabilistic risk assessment based on time series of ecosystem behaviour and climate conditions. Given the risk assessment terminology, vulnerability and risk for the previously defined hazard are estimated on the basis of observed hazardous ecosystem behaviour. We apply this approach to extreme responses of terrestrial ecosystems to drought, defining the hazard as a negative net biome productivity over a 12-month period. We show an application for two selected sites using data for 1981-2010 and then apply the method to the pan-European scale for the same period, based on numerical modelling results (LPJmL for ecosystem behaviour; ERA-Interim data for climate). Our site-specific results demonstrate the applicability of the proposed method, using the SPEI to describe the climate condition. The site in Spain provides an example of vulnerability to drought because the expected value of the SPEI is 0.4 lower for hazardous than for non-hazardous ecosystem behaviour. In northern Germany, on the contrary, the site is not vulnerable to drought because the SPEI expectation values imply wetter conditions in the hazard case than in the non-hazard case. At the pan-European scale, ecosystem vulnerability to drought is calculated in the Mediterranean and temperate region, whereas Scandinavian ecosystems are vulnerable under conditions without water shortages. These first model- based applications indicate the conceptual advantages of the proposed method by focusing on the identification of critical weather conditions for which we observe hazardous ecosystem behaviour in the analysed data set. Application of the method to empirical time series and to future climate would be important next steps to test the approach.}, language = {en} } @misc{PradhanFischerVelthuizenetal.2015, author = {Pradhan, Prajal and Fischer, G{\"u}nther and Velthuizen, Harrij van and Reusser, Dominik Edwin and Kropp, J{\"u}rgen}, title = {Closing yield gaps}, series = {Postprints der Universit{\"a}t Potsdam : Mathematisch-Naturwissenschaftliche Reihe}, journal = {Postprints der Universit{\"a}t Potsdam : Mathematisch-Naturwissenschaftliche Reihe}, number = {491}, issn = {1866-8372}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-408105}, pages = {18}, year = {2015}, abstract = {Global food production needs to be increased by 60-110\% between 2005 and 2050 to meet growing food and feed demand. Intensification and/or expansion of agriculture are the two main options available to meet the growing crop demands. Land conversion to expand cultivated land increases GHG emissions and impacts biodiversity and ecosystem services. Closing yield gaps to attain potential yields may be a viable option to increase the global crop production. Traditional methods of agricultural intensification often have negative externalities. Therefore, there is a need to explore location-specific methods of sustainable agricultural intensification. We identified regions where the achievement of potential crop calorie production on currently cultivated land will meet the present and future food demand based on scenario analyses considering population growth and changes in dietary habits. By closing yield gaps in the current irrigated and rain-fed cultivated land, about 24\% and 80\% more crop calories can respectively be produced compared to 2000. Most countries will reach food self-sufficiency or improve their current food self-sufficiency levels if potential crop production levels are achieved. As a novel approach, we defined specific input and agricultural management strategies required to achieve the potential production by overcoming biophysical and socioeconomic constraints causing yield gaps. The management strategies include: fertilizers, pesticides, advanced soil management, land improvement, management strategies coping with weather induced yield variability, and improving market accessibility. Finally, we estimated the required fertilizers (N, P2O5, and K2O) to attain the potential yields. Globally, N-fertilizer application needs to increase by 45-73\%, P2O5-fertilizer by 22-46\%, and K2O-fertilizer by 2-3 times compared to the year 2010 to attain potential crop production. The sustainability of such agricultural intensification largely depends on the way management strategies for closing yield gaps are chosen and implemented.}, language = {en} } @phdthesis{Mangelsdorf2009, author = {Mangelsdorf, Stefan}, title = {Die Transformation des Verarbeitenden Gewerbes in Berlin/Brandenburg unter Ber{\"u}cksichtigung der Exporte : eine empirische Analyse mit amtlichen Mikrodaten}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, isbn = {978-3-86956-068-7}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-44414}, school = {Universit{\"a}t Potsdam}, pages = {241}, year = {2009}, abstract = {20 Jahre sind mittlerweile vergangen seit die friedliche Protestbewegung zur Abdankung des alten Regimes der Deutschen Demokratischen Republik f{\"u}hrte. Im darauf folgenden Jahre kam es zur Wiedervereinigung der beiden deutschen Staaten. Der anschließende Transformationsprozess ist aufgrund der besonderen Umst{\"a}nde in Deutschland einzigartig unter den ehemaligen sozialistischen Staaten Mittel- und Osteuropas. Der Schwerpunkt dieser Arbeit liegt in der Transformation des Verarbeitenden Gewerbes in den Bundesl{\"a}ndern Berlin und Brandenburg. Mit der Wiedervereinigung der beiden deutschen Staaten ver{\"a}nderte sich die Situation f{\"u}r die Betriebe im ehemals sozialistischen Teil auf dramatische Weise. Die Auswirkungen werden anhand von Makro- und Mikrodaten analysiert. Untersuchungsgegenst{\"a}nde sind verschiedene {\"o}konomische Indikatoren, wie Zahl von Betrieben und Arbeitspl{\"a}tzen, Strukturen (nach Gr{\"o}ße und Branchen), Ums{\"a}tze (im In- und Ausland) sowie Investitionen. Der Vergleich von Brandenburg und Ostberlin mit Westberlin bietet dabei die M{\"o}glichkeit, Aufschluss {\"u}ber den erreichten Stand des Transformationsprozesses zu erhalten. Die Datenbasis dieser Arbeit besteht neben Angaben aus der Volkswirtschaftlichen Gesamtrechnung der L{\"a}nder aus verschiedenen betriebsbasierten Erhebungen der amtlichen Statistik. Der Beobachtungszeitraum umfasst dabei die Jahre 1991 bis 2005. Zur Analyse von Betriebs- und Besch{\"a}ftigungszahlen und ihrer Dynamik steht sogar eine Totalerhebung f{\"u}r die Jahre 1991 bis 2000 zur Verf{\"u}gung. Ein besonderer Schwerpunkt dieser Arbeit ist die Rolle der Exporte f{\"u}r die betriebliche Entwicklung. Die deutsche Wirtschaftspolitik f{\"o}rdert Unternehmen bei ihrem Schritt auf ausl{\"a}ndische M{\"a}rkte, da man sich von Exporten eine Wachstumsstimulation erhofft. Damit eine solche F{\"o}rderung auch langfristige positive Effekte entfalten kann, muss einerseits der Export positiven Einfluss auf das Produktivit{\"a}tswachstum des betreffenden Betriebes haben, und andererseits muss das Exportverhalten eine gewisse Persistenz aufweisen. Beide Bedingungen werden innerhalb der Arbeit detailliert untersucht.}, language = {de} } @article{HippKonrad2022, author = {Hipp, Lena and Konrad, Markus}, title = {Has Covid-19 increased gender inequalities in professional advancement?}, series = {Journal of family research}, volume = {34}, journal = {Journal of family research}, number = {1}, publisher = {University of Bamberg Press}, address = {Bamberg}, issn = {2699-2337}, doi = {10.20377/jfr-697}, pages = {134 -- 160}, year = {2022}, abstract = {Objective: This article analyzed gender differences in professional advancement following the outbreak of the Covid-19 pandemic based on data from open-source software developers in 37 countries. Background: Men and women may have been affected differently from the social distancing measures implemented to contain the Covid-19 pandemic. Given that men and women tend to work in different jobs and that they have been unequally involved in childcare duties, school and workplace closings may have impacted men's and women's professional lives unequally. Method: We analyzed original data from the world's largest social coding community, GitHub. We first estimated a Holt-Winters forecast model to compare the predicted and the observed average weekly productivity of a random sample of male and female developers (N=177,480) during the first lockdown period in 2020. To explain the crosscountry variation in the gendered effects of the Covid-19 pandemic on software developers' productivity, we estimated two-way fixed effects models with different lockdown measures as predictors - school and workplace closures, in particular. Results: In most countries, both male and female developers were, on average, more productive than predicted, and productivity increased for both genders with increasing lockdown stringency. When examining the effects of the most relevant types of lockdown measures separately, we found that stay-at-home restrictions increased both men's and women's productivity and that workplace closures also increased the number of weekly contributions on average - but for women, only when schools were open. Conclusion: Having found gender differences in the effect of workplace closures contingent on school and daycare closures within a population that is relatively young and unlikely to have children (software developers), we conclude that the Covid-19 pandemic may indeed have contributed to increased gender inequalities in professional advancement.}, language = {en} } @article{GiotopoulosKritikosTsakanikas2022, author = {Giotopoulos, Ioannis and Kritikos, Alexander S. and Tsakanikas, Aggelos}, title = {A lasting crisis affects R\&D decisions of smaller firms}, series = {The Journal of technology transfer}, journal = {The Journal of technology transfer}, number = {48}, publisher = {Springer Science+Business Media}, address = {Dordrecht}, issn = {0892-9912}, doi = {10.1007/s10961-022-09957-7}, pages = {1161 -- 1175}, year = {2022}, abstract = {We use the prolonged Greek crisis as a case study to understand how a lasting economic shock affects the innovation strategies of firms in economies with moderate innovation activities. Adopting the 3-stage CDM model, we explore the link between R\&D, innovation, and productivity for different size groups of Greek manufacturing firms during the prolonged crisis. At the first stage, we find that the continuation of the crisis is harmful for the R\&D engagement of smaller firms while it increased the willingness for R\&D activities among the larger ones. At the second stage, among smaller firms the knowledge production remains unaffected by R\&D investments, while among larger firms the R\&D decision is positively correlated with the probability of producing innovation, albeit the relationship is weakened as the crisis continues. At the third stage, innovation output benefits only larger firms in terms of labor productivity, while the innovation-productivity nexus is insignificant for smaller firms during the lasting crisis.}, language = {en} } @misc{FrielerLevermannElliottetal.2015, author = {Frieler, Katja and Levermann, Anders and Elliott, J. and Heinke, J. and Arneth, A. and Bierkens, M. F. P. and Ciais, Philippe and Clark, D. B. and Deryng, D. and Doell, P. and Falloon, P. and Fekete, B. and Folberth, Christian and Friend, A. D. and Gellhorn, C. and Gosling, S. N. and Haddeland, I. and Khabarov, N. and Lomas, M. and Masaki, Y. and Nishina, K. and Neumann, K. and Oki, T. and Pavlick, R. and Ruane, A. C. and Schmid, E. and Schmitz, C. and Stacke, T. and Stehfest, E. and Tang, Q. and Wisser, D. and Huber, V. and Piontek, Franziska and Warszawski, L. and Schewe, Jacob and Lotze-Campen, Hermann and Schellnhuber, Hans Joachim}, title = {A framework for the cross-sectoral integration of multi-model impact projections}, series = {Earth system dynamics}, journal = {Earth system dynamics}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-407968}, pages = {14}, year = {2015}, abstract = {Climate change and its impacts already pose considerable challenges for societies that will further increase with global warming (IPCC, 2014a, b). Uncertainties of the climatic response to greenhouse gas emissions include the potential passing of large-scale tipping points (e.g. Lenton et al., 2008; Levermann et al., 2012; Schellnhuber, 2010) and changes in extreme meteorological events (Field et al., 2012) with complex impacts on societies (Hallegatte et al., 2013). Thus climate change mitigation is considered a necessary societal response for avoiding uncontrollable impacts (Conference of the Parties, 2010). On the other hand, large-scale climate change mitigation itself implies fundamental changes in, for example, the global energy system. The associated challenges come on top of others that derive from equally important ethical imperatives like the fulfilment of increasing food demand that may draw on the same resources. For example, ensuring food security for a growing population may require an expansion of cropland, thereby reducing natural carbon sinks or the area available for bio-energy production. So far, available studies addressing this problem have relied on individual impact models, ignoring uncertainty in crop model and biome model projections. Here, we propose a probabilistic decision framework that allows for an evaluation of agricultural management and mitigation options in a multi-impact-model setting. Based on simulations generated within the Inter-Sectoral Impact Model Intercomparison Project (ISI-MIP), we outline how cross-sectorally consistent multi-model impact simulations could be used to generate the information required for robust decision making. Using an illustrative future land use pattern, we discuss the trade-off between potential gains in crop production and associated losses in natural carbon sinks in the new multiple crop-and biome-model setting. In addition, crop and water model simulations are combined to explore irrigation increases as one possible measure of agricultural intensification that could limit the expansion of cropland required in response to climate change and growing food demand. This example shows that current impact model uncertainties pose an important challenge to long-term mitigation planning and must not be ignored in long-term strategic decision making.}, language = {en} } @article{AudretschKritikosSchiersch2020, author = {Audretsch, David B. and Kritikos, Alexander and Schiersch, Alexander}, title = {Microfirms and innovation in the service sector}, series = {Small business economics}, volume = {55}, journal = {Small business economics}, number = {4}, publisher = {Springer Science + Business Media B.V.}, address = {Dordrecht}, issn = {0921-898X}, doi = {10.1007/s11187-020-00366-4}, pages = {997 -- 1018}, year = {2020}, abstract = {In the context of microfirms, this paper analyzes whether the link between the three aspects involving innovative activities—R\&D, innovative output, and productivity—hold for knowledge-intensive services. With especially high start-up rates and the majority of employees in microfirms, knowledge-intensive services (KIS) have a starkly different profile from manufacturing. Results from our structural models indicate that KIS firms benefit from innovation activities through increased labor productivity with highly skilled employees being similarly important compared to R\&D for creating innovation output in microfirms. Moreover, the firm size advantage of large firms found for manufacturing almost disappears in KIS, with start-ups and young firms having a higher probability of initiating innovation activities and of successfully turning knowledge into innovation output than mature firms.}, language = {en} } @article{AbuJarourAjjanFedorowiczetal.2021, author = {AbuJarour, Safa'a and Ajjan, Haya and Fedorowicz, Jane and Owens, Dawn}, title = {How working from home during COVID-19 affects academic productivity}, series = {Communications of the Association for Information Systems : CAIS}, volume = {48}, journal = {Communications of the Association for Information Systems : CAIS}, publisher = {Association for Information Systems}, address = {New York, NY}, issn = {1529-3181}, doi = {10.17705/1CAIS.04808}, pages = {55 -- 64}, year = {2021}, abstract = {The coronavirus disease of 2019 (COVID-19) pandemic has forced most academics to work from home. This sudden venue change can affect academics' productivity and exacerbate the challenges that confront universities as they face an uncertain future. In this paper, we identify factors that influence academics' productivity while working from home during the mandate to self-isolate. From analyzing results from a global survey we conducted, we found that both personal and technology-related factors affect an individual's attitude toward working from home and productivity. Our results should prove valuable to university administrators to better address the work-life challenges that academics face.}, language = {en} }