What Makes Single Mothers Expand or Reduce Employment?

To explore single mothers' labor market participation we analyze specific circumstances and dynamics in their life courses. We focus on the question which individual and institutional factors determine both professional advancement and professional descent. Due to dynamics in women's life course identifying and analyzing restrictions and interruptions of employment requires a longitudinal research design. The German Socio-Economic Panel (1984-2009) provides all necessary information identifying episodes of single motherhood and employment during life courses. Since family statuses of single mothers are partially endogenous and can end in multiple ways, we use semi-parametric survival models. Competing risks estimations offer a detailed view by analyzing single mothers' transition from not being employed to full-time or part-time work and vice versa simultaneously. Estimates show that occupational careers of single mothers are influenced by both individual factors and institutional circumstances. Whereas specific problems occur shortly after becoming a single mother, these problems seem to be dealt with over time. Enhancing labor market participation or maintaining full-time employment as a single mother can be achieved when certain challenges are met such as appointed and reliable working hours. Single mothers that do not have to rely on public childcare arrangements, but are capable of finding individual solutions are more likely to balance work and family life. Among institutional determinants welfare benefits have a negative effect on the market labor participation of women in low-paid jobs

Orientational Effects and Random Mixing in 1-Alkanol + Alkanone Mixtures

1-Alkanol + alkanone systems have been investigated through the data analysis of molar excess functions, enthalpies, isobaric heat capacities, volumes and entropies, and using the Flory model and the formalism of the concentrationconcentration structure factor (SCC(0)). The enthalpy of the hydroxyl-carbonyl interactions has been evaluated. These interactions are stronger in mixtures with shorter alcohols (methanol-1-butanol) and 2-propanone or 2-butanone. However, effects related to the self-association of alcohols and to solvation between unlike molecules are of minor importance when compared with those which arise from dipolar interactions. Physical interactions are more relevant in mixtures with longer 1-alkanols. The studied systems are characterized by large structural effects. The variation of the molar excess enthalpy with the alcohol size along systems with a given ketone or with the alkanone size in solutions with a given alcohol are discussed in terms of the different contributions to this excess function. Mixtures with methanol show rather large orientational effects. The random mixing hypothesis is attained to a large extent for mixtures with 1-alkanols ≠ methanol and 2-alkanones. Steric effects and cyclization lead to stronger orientational effects in mixtures with 3-pentanone, 4-heptanone, or cyclohexanone. The increase of temperature weakens orientational effects. Results from SCC(0) calculations show that homocoordination is predominant and support conclusions obtained from the Flory model.Ministerio de Ciencia e Innovación, under Project FIS2010-1695