The factors affecting vortex growth in convectively stable protoplanetary disks are explored using numerical simulations of a two-dimensional anelasticgas model which includes baroclinic vorticity production and radiative cooling. The baroclinic feedback, where anomalous temperature gradients produce vorticity through the baroclinic term and vortices then reinforce these temperature gradients, ...

A simple statistical-dynamical model relating synoptic scale changes in the meridional temperature gradient to changes in the meridional eddy sensible heat flux is developed. The model solution is compared with observations relating the flux to the stability parameter for the two layer model which, assuming the variance of the critical shear in the two layer model is negligible, is equivalent t...

the present study-both qualitative and quantitative--explored fifty efl learners’ preferences for receiving error feedback on different grammatical units as well as their beliefs about teacher feedback strategies. the study also examined the effect of the students’ level of writing ability on their views about the importance of teacher feedback on different error types. data was gathered throug...

Using hydrodynamical simulations of the -cold dark matter cosmology that include both radiative cooling and a phenomenological model for star formation and supernovae feedback, we investigate the impact of galaxy formation on the X-ray properties of groups at zero redshift. Motivated by the observed ‘break’ in the Lx–T x relation at kTx ∼ 1–2 keV, our feedback model is based on the assumption t...

Using two versions of the GFDL coupled ocean-atmosphere model, one where water vapor anomalies are allowed to affect the longwave radiation calculation and one where they are not, we examine the role of water vapor feedback in internal precipitation variability and greenhouse-gas-forced intensification of the hydrologic cycle. Without external forcing, the experiment with water vapor feedback p...

the objective of the present paper is to shed some light on peer feedback in efl writing courses. in recent years, with regard to teaching writing, there has been a total shift of approach, from product-orientation to process-orientation. a key component of the latter is peer assessment in which learners read each other's compositions and provide feedback to the writer, based on the teache...

researchers have suggested that interactional feedback which is between teacher and learner during their writing is associated with l2 learning because it prompts learners to notice l2 forms. this paper reports a classroom-based study that investigated the role of feedback in socio-cultural theory. in this study, 12 efl learners performed on three writing tasks and were provided with a three-st...

We revisit a model of feedback processes proposed by Lindzen et al. (2001), in which an assumed 22% reduction in the area of tropical high clouds per degree increase in sea surface temperature produces negative feedbacks associated with upper tropospheric water vapor and cloud radiative effects. We argue that the water vapor feedback is overestimated in Lindzen et al. (2001) by at least 60%, an...

This diploma thesis deals with physical effects in the light output of a vertical cavity surface emitting laser (VCSEL) diode caused by external optical feedback. Such feedback might be induced by reflections from the beginning of a optical waveguide due to a connected refractive index step. The thesis also investigates the influence on waveguide coupled power on opto-electronic waveguide board...

We describe a simple means of modulating preparation temperature, which may be useful in undergraduate physiology laboratories. The device was developed in an effort to make teaching exercises that involve temperature modulation accessible at low cost. Although we were interested in using the device specifically with the larval fruit fly preparation, it is applicable to many preparations and te...