نتایج جستجو برای: r23
تعداد نتایج: 330 فیلتر نتایج به سال:
We are undertaking a program to measure emission line ratios in a selected sample of 0.5 < z < 1.0 CFRS starforming galaxies in order to compute their Interstellar Medium metallicities. The latter are derived by means of the empirically-calibrated R23 estimator introduced by Pagel et al. (1979). Here we focus on a subsample of 15 galaxies with LHβ > 1.2 × 10 41 erg s. In addition to the optical...
We present the results from the analysis of optical spectra of 31 H -selected regions in the extended UV (XUV) disks of M83 (NGC 5236) and NGC 4625 recently discovered byGALEX. The spectra were obtained using IMACS at the Las Campanas Observatory 6.5 mMagellan I telescope and COSMIC at the Palomar 200 inch (5 m) telescope, respectively, for M83 and NGC 4625. The line ratios measured indicate ne...
In recent decades, gentrification has transformed American central city neighborhoods. I estimate a spatial equilibrium model to show that the rising value of high-skilled workers’ time contributes cities. increasing raises cost commuting and exogenously increases demand for locations by workers. While change in modest direct effect on cities, is substantially magnified endogenous amenity drive...
Myotendinous strain injury is the most common injury of human skeletal muscles because the majority of muscle forces are transmitted through this region. Although the immediate response to strain injury is well characterized, the chronic response to myotendinous strain injury is less clear. Here we examined the molecular and cellular adaptations to chronic myotendinous strain injury in mdx mice...
This talk is inspired by two previous ICM talks, by V. Drinfeld (1986), and G.Felder (1994). Namely, one of the main ideas of Drinfeld’s talk is that the quantum Yang-Baxter equation, which is an important equation arising in quantum field theory and statistical mechanics, is best understood within the framework of Hopf algebras, or quantum groups. On the other hand, in Felder’s talk, it is exp...
How does rural-urban migration shape urban production in developing countries? We use longitudinal data on Chinese manufacturing firms between 2000 and 2006, exploit exogenous variation induced by agricultural income shocks for identification. find that, when immigration increases, becomes more labor intensive productivity declines. investigate the reorganization of using patent applications pr...
Aims. The knowledge of the number and physical nature of low-metallicity massive galaxies is crucial for determining and interpreting the mass-metallicity relation (MZR). Methods. Using VLT-ISAAC near-infrared (NIR) spectroscopy of 39 zCOSMOS 0.5 < z < 0.9 galaxies, we have measured Hα and [N II] λ 6584 emission line fluxes for galaxies with [O II] λ 3727, Hβ, and [O III] λ 5007 available from ...
To explain the links between population distribution and economic integration, we construct a spatial economics model with endogenous fertility. A higher population concentration increases real wages and child-raising costs, thus lowering the fertility rate. However, people migrate to more populated regions to obtain higher real wages. We show that mobility across regions results in more people...
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