Yield predictions are performed to predict the solar resource, the performance and the energy production over the expected lifetime of a photovoltaic (PV) system. In this study, we compare yield predictions and monitored data for 26 PV power plants located in southern Germany and Spain. The monitoring data include in‐plane irradiance for comparison with the estimated solar resource and energy yield for comparison with predicted performance. The results show that because of increased irradiance in recent years (‘global brightening’) the yield predictions systematically underestimate the energy yield of PV systems by about 5%. Because common irradiance databases and averaging times were used for the yield predictions analysed in this paper, it is concluded that yield predictions for areas where the global brightening effect occurred in general underestimated the energy yield by the same magnitude. Using recent satellite‐derived irradiance time series avoids this underestimation. The observed performance ratio of the analysed systems decreases by 0.5%/year in average with a relatively high spread between individual systems. This decrease is a main factor for the combined uncertainty of yield predictions. It is attributed to non‐reversible degradation of PV cells or modules and to reversible effects, like soiling. Based on the results of the validation, the combined uncertainty of state of the art yield predictions using recent solar irradiance data is estimated to about 8%. Copyright © 2015 John Wiley & Sons, Ltd.

The persistence of gender inequality in postindustrial societies is puzzling in light of a plethora of changes that destabilize it, including shifts in economy, legislation, and the proliferation of feminist politics. In family relations, such persistence manifests as a disconnect between couples aspiring to be more egalitarian yet continuing to enact traditional gender roles and hierarchies. There is an emerging consensus that gender inequality persists because of people's continued reliance on sexist ideology or gendered assumptions that constitute women as innately distinct from and inferior to men. Sexist ideology changes its form to accommodate to changing socio-economic conditions. Contemporary forms of sexism are old ways of legitimizing male power articulated in new and creative ways, often by incorporating feminist arguments. To effectively recognize and address "new sexism," scholars and practitioners require new, innovative research frameworks. Our objective in writing this article is two-fold. First, we seek to advance discursive (i.e., focused on language in use) approaches to the study of sexism. Second, we present the results of a discursive analysis of "new" sexist discourse in the context of couple therapy. The study provides preliminary evidence that, despite endorsing egalitarian norms, couples studied continue to rely on gender binaries and remain entrenched in old-fashioned patterns of gender inequality. Implications of these results for the practice of couple therapy and for future research are discussed.

In recent years, there has been a rapid increase in attention to gender and gender-based inequalities in family therapy. Despite this, there is a dearth of empirical work that examines how gendered inequalities intersecting with other axes of privilege/oppression are maintained within families, including in the therapeutic context. In this study, we used Foucauldian discourse analysis to examine how gendered power is produced and reproduced circularly or through recurrent patterns of interaction in couple therapy. We identified gendered discourses and assumptions informing partners' constructions of their gendered selves and relationships. We highlight the complexity and intersectionality of gendered subjectivities and relations in contemporary Canadian couples involved in heterosexual relationships. Although women in this study contest their oppression and exhibit agency to negotiate who they are in general and in relation to men, they simultaneously continue to occupy subordinate positions in a gender order that is culturally and interactionally allocated to them. We discuss implications for family therapy practice.

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