Tahun Terbit

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Let Cn be the free center-by-metabelian Lie algebra of finite rank n, with n ≥ 2, over a field K of characteristic 0.We study the automorphism group Aut(Cn) of Cn by means of a topology. Let TCn be the group of tame automorphisms of Cn and GLn(K) be the general linear group. It is shown that for any finite subset X of IA-automorphisms of C2, the subgroup of Aut(C2) generated by GL2(K) a…

We study the homological finiteness properties FPm of wreath products  = H X G. We show that, when H has infinite abelianization,  is of type FPm if and only if both G and H have type FPm and G acts (diagonally) on Xi with stabilizers of type FPm−i and with finitely many orbits for all 1 ≤ i ≤ m. If furthermore H is torsion-free, we give a criterion for  to be Bredon-FPm …

For c > 1, c / ∈ Z and χ a primitive character (mod q), we estimate the sum  x

We present a new approach to measuring crustal thickness and bulk properties from teleseismic data. In contrast to the traditional H − k stacking approach, which involves receiver-function deconvolution followed by stacking along expected arrival-time curves, we eliminate the deconvolution step and generate synthetic transfer functions predicting the relationship between the vertical and …

Hydraulically induced microseismicity is used to study high-frequency attenuation properties (6–72 Hz) in an enhanced geothermal system. Intrinsic and scattering attenuation are separated by jointly inverting seismogram envelopes for structural parameters, source and site effects. Modelling of synthetic envelopes is based on radiative transfer theory. To speed up inversion, an analytical solu…

The purpose of this note is to clarify some details in McDuff and Segal’s proof of the group completion theorem in McDuff and Segal [Homology fibrations and the ‘group-completion’ theorem, Invent. Math. 31 (1975/76), 279–284] and generalize this and the homology fibration criterion of McDuff [Configuration spaces of positive and negative particles, Topology 14 (1975), 91–107] to homo…

In TESOL teacher mentoring, giving advice can be conceptualized as a continuum, ranging from directive to facilitative feedback. The goal, over time, is to lead toward the facilitative end of the continuum and specifically to catalytic interventions that encourage self-reflection and autonomous learning. This study begins by examining research on the mentor’s advicegiving role. Next, the expe…

We develop a new method referred to as the AR-z spectrum for detecting harmonic signals with exponential decay/growth contained in a noisy time-series by extending the auto regressive (AR) method of Chao & Gilbert. The method consists of (i) ‘blindly’ forcing one 2nd-order AR fit to the signal content in the frequency domain for any chosen frequency whether or not there is truly a signal; (…

We determine the deep structure of the eastern Algerian basin and its southern margin in the Annaba region (easternmost Algeria), to better constrain the plate kinematic reconstruction in this region. This study is based on new geophysical data collected during the SPIRAL cruise in 2009, which included a wide-angle, 240-km-long, onshore–offshore seismic profile, multi channel seismic reflecti…