An Assessment of the Educational Choices of Emerging Adults from a Small Mennonite Denomination and their Later Church and Service Involvement

This study was designed to provide Rosedale Bible college, a Conservative Mennonite Conference school in Ohio, with critical information to increase its understanding of the educational choices of emerging adults from its sponsoring denomination and the way those choices correlate with church involvement and volunteerism later in life. The study also offers a glimpse into the educational and religious context of these young adults and the denomination they were part of as youth. A 16-question survey was distributed to 1,068 individuals ages 26-32 who attended one of the denomination’s churches when in high school. The survey queried respondents on personal data, educational choices, church involvement, and volunteerism. A total of 240 valid surveys were received, including 47 respondents who had attended the denomination’s college. Through cross tabulation and testing for statistical significance, the research found that attendance at the denomination’s college was moderately related to greater regular church attendance compared to those who did not attend the college. In addition, attendance at the college was moderately related to a lower likelihood of regular civic volunteerism. Research also found a strong relationship between a secular education and a lower likelihood of regular church attendance later in life, compared to those who participated in formal religious educational experiences as young people

A parallel and adaptive space-time discontinuous Galerkin method for visco-elastic and visco-acoustic waves

We develop an adaptive discontinuous Galerkin space-time discretization for elastic and acoustic waves with attenuation, described by retarded material laws for generalized standard linear solids. The linear system is solved with a parallel multigrid method. Numerically the method is evaluated for a benchmark configuration in geophysics, where the convergence is tested with respect to seismograms. We show that the adaptive method based on goal-oriented error estimation is able to reduce the computational effort substantially

Catalytic Enantioselective Carbon–Oxygen Bond Formation: Phosphine-Catalyzed Synthesis of Benzylic Ethers via the Oxidation of Benzylic C–H Bonds

Benzylic alcohols and ethers are common subunits in bioactive molecules, as well as useful intermediates in organic chemistry. In this Communication, we describe a new approach to the enantioselective synthesis of benzylic ethers through the chiral phosphine-catalyzed coupling of two readily available partners, γ-aryl-substituted alkynoates and alcohols, under mild conditions. In this process, the alkynoate partner undergoes an internal redox reaction. Specifically, the benzylic position is oxidized with good enantioselectivity, and the alkyne is reduced to the alkene

Finding Direct-Collapse Black Holes at Birth

Direct-collapse black holes (DCBHs) are currently one of the leading contenders for the origins of the first quasars in the universe, over 300 of which have now been found at $z >$ 6. But the birth of a DCBH in an atomically-cooling halo does not by itself guarantee it will become a quasar by $z \sim$ 7, the halo must also be located in cold accretion flows or later merge with a series of other gas-rich halos capable of fueling the BH's rapid growth. Here, we present near infrared luminosities for DCBHs born in cold accretion flows in which they are destined to grow to 10$^9$ M$_{\odot}$ by $z \sim$ 7. Our observables, which are derived from cosmological simulations with radiation hydrodynamics with Enzo, reveal that DCBHs could be found by the James Webb Space Telescope at $z \lesssim$ 20 and strongly-lensed DCBHs might be found in future wide-field surveys by Euclid and the Wide-Field Infrared Space Telescope at $z \lesssim$ 15.Comment: 5 pages, 2 figures, accepted by ApJ

Design of a Mean Power Wind Conversion Chain with a Magnetic Speed Multiplier

International audienc

Parallel space-time solutions for the linear visco-acoustic and visco-elastic wave equation

We present parallel adaptive results for a discontinuous Galerkin space-time discretization for acoustic and elastic waves with attenuation. The method is based on $p$-adaptive polynomial discontinuous ansatz and test spaces and a first-order formulation with full upwind fluxes. Adaptivity is controlled by dual-primal error estimation, and the full linear system is solved by a Krylov method with space-time multilevel preconditioning. The discretization and solution method is introduced in Dörfler-Findeisen-Wieners (Comput. Meth. Appl. Math. 2016) for general linear hyperbolic systems and applied to acoustic and elastic waves in Dörfler-Findeisen-Wieners-Ziegler (Radon Series Comp. Appl. Math. 2019); attenuation effects were included in Ziegler (PhD thesis 2019, Karlsruhe Institute of Technology). Here, we consider the evaluation of this method for a benchmark configuration in geophysics, where the convergence is tested with respect to seismograms. We consider the scaling on parallel machines and we show that the adaptive method based on goal-oriented error estimation is able to reduce the computational effort substantially

Parallel adaptive discontinuous Galerkin discretizations in space and time for linear elastic and acousticwaves

We introduce a space-time discretization for elastic and acoustic waves using a discontinuous Galerkin approximation in space and a Petrov–Galerkin scheme in time. For the dG method, the upwind flux is evaluated by explicitly solving a Riemann problem. Then we show well-posedness and convergence of the discrete system. Based on goal-oriented dualweighted error estimation an adaptive strategy is introduced. The full space-time linear system is solved with a parallel multilevel preconditioner. Numerical experiments for acoustic and elastic waves underline the efficiency of the overall adaptive solution process