New Evidence on Financial Incentives and the Timing of Retirement

We investigate the responsiveness of individual retirement decisions to changes in financial incentives. The causal effect is identified based on the natural experiment generated by an institutional reform. The results of a binary retirement model are robust to alternative model specifications, to a competing risks framework with endogenous panel attrition, and to alternative representations of unobserved individual-specific heterogeneity. We find strong behavioral effects of changes in financial retirement incentives. A permanent reduction of retirement benefits by 3.4 percent induces a decline in the age-specific annual retirement probability by over 50 percent. The response to the reforms intensifies over time suggesting that retirement behavior may be affected by social norms. The response to changes in financial retirement benefits varies with educational background: those with low education respond most strongly to an increase in the price of leisure.retirement insurance, incentives, social security, labor force exit, natural experiment, Switzerland

Probing the parton content of the nucleon

The parton content of the nucleon is explored within a meson-cloud model developed to derive light-cone wave functions for the physical nucleon. The model is here applied to study electromagnetic form factors, distribution amplitudes and nucleon-to-meson transition distribution amplitudes.Comment: 10 pages, 6 figures; proceedings of the workshop "Recent Advances in Perturbative QCD and Hadronic Physics" in Honor of Prof. Anatoly Efremov's 75th Birthday Celebration; to appear in Mod. Phys. Lett.

Contralateral inhibition of click- and chirp-evoked human compound action potentials

Cochlear outer hair cells (OHC) receive direct efferent feedback from the caudal auditory brainstem via the medial olivocochlear (MOC) bundle. This circuit provides the neural substrate for the MOC reflex, which inhibits cochlear amplifier gain and is believed to play a role in listening in noise and protection from acoustic overexposure. The human MOC reflex has been studied extensively using otoacoustic emissions (OAE) paradigms; however, these measurements are insensitive to subsequent “downstream” efferent effects on the neural ensembles that mediate hearing. In this experiment, click- and chirp-evoked auditory nerve compound action potential (CAP) amplitudes were measured electrocochleographically from the human eardrum without and with MOC reflex activation elicited by contralateral broadband noise. We hypothesized that the chirp would be a more optimal stimulus for measuring neural MOC effects because it synchronizes excitation along the entire length of the basilar membrane and thus evokes a more robust CAP than a click at low to moderate stimulus levels. Chirps produced larger CAPs than clicks at all stimulus intensities (50–80 dB ppeSPL). MOC reflex inhibition of CAPs was larger for chirps than clicks at low stimulus levels when quantified both in terms of amplitude reduction and effective attenuation. Effective attenuation was larger for chirp- and click-evoked CAPs than for click-evoked OAEs measured from the same subjects. Our results suggest that the chirp is an optimal stimulus for evoking CAPs at low stimulus intensities and for assessing MOC reflex effects on the auditory nerve. Further, our work supports previous findings that MOC reflex effects at the level of the auditory nerve are underestimated by measures of OAE inhibition

Efficient excitation of cavity resonances of subwavelength metallic gratings

One dimensional rectangular metallic gratings enable enhanced transmission of light for specific resonance frequencies. Two kinds of modes participating to enhanced transmission have already been demonstrated : (i) waveguide modes and (ii) surface plasmon polaritons (SPP). Since the original paper of Hessel and Oliner \cite{hessel} pointing out the existence of (i), no progress was made in their understanding. We present here a carefull analysis, and show that the coupling between the light and such resonances can be tremendously improved using an {\it evanescent} wave. This leads to enhanced localisation of light in cavities, yielding, in particular, to a very selective light transmission through these gratings.Comment: 4 pages, 5 figures, submitted to Phys. Rev. Let

On the interplay of speciation and dispersal: An evolutionary food web model in space

We introduce an evolutionary metacommunity of multitrophic food webs on several habitats coupled by migration. In contrast to previous studies that focus either on evolutionary or on spatial aspects, we include both and investigate the interplay between them. Locally, the species emerge, interact and go extinct according to the rules of the well-known evolutionary food web model proposed by Loeuille and Loreau in 2005. Additionally, species are able to migrate between the habitats. With random migration, we are able to reproduce common trends in diversity-dispersal relationships: Regional diversity decreases with increasing migration rates, whereas local diversity can increase in case of a low level of dispersal. Moreover, we find that the total biomasses in the different patches become similar even when species composition remains different. With adaptive migration, we observe species compositions that differ considerably between patches and contain species that are descendant from ancestors on both patches. This result indicates that the combination of spatial aspects and evolutionary processes affects the structure of food webs in different ways than each of them alone.Comment: under review at JT

"Back to the Future" in Philosophical Dialogue: A Plea for Changing P4C Teacher Education

While making P4C much more easily disseminated, short-term weekend and weeklong P4C training programs not only dilute the potential laudatory impact of P4C, they can actually be dangerous. As well, lack of worldwide standards precludes the possibility of engaging in sufficiently high quality research of the sort that would allow the collection of empirical data in support the efficacy of worldwide P4C adoption. For all these reasons, the authors suggest that P4C advocates ought to insist that programs of a minimum of five philosophy courses be accepted as the recognized standard for any teacher to legitimately claim that she is teaching Philosophy for Children

\u3ci\u3eAcrobasis\u3c/i\u3e Shoot Moth (Lepidoptera: Pyralidae) Infestation-Tree Height Link in a Young Black Walnut Plantation

Acrobasis shoot moth infestations were evaluated in a young black walnut progeny test for 4 years, from ages 3 to 6. Infestation levels were greatest on the largest trees in the fourth and fifth year after plantation establishment, and were declining by the sixth year. Acrobasis infestation appears to be a problem primarily on young trees less than 2.5 m in height. There was no evidence for genetic resistance to Acrobasis infestation in black walnut

The Employment of Mothers - Recent Developments and their Determinants in East and West Germany

We apply German Mikrozensus data for the period 1996 to 2004 to investigate the employment status of mothers. Specifically, we ask whether there are behavioral differences between mothers in East and West Germany, whether these differences disappear over time, and whether there are differences in the developments for high and low skilled females. We find substantial differences in the employment behavior of East and West German mothers. German family policy sets incentives particularly for low income mothers not to return to the labor market after birth. This seems to affect the development of East-West German employment differences as East German women with low earnings potentials appear to adopt West German low employment patterns over time.employment, mothers, parental leave, East Germany, child care