Expanding the Life-Span, Life-Space Approach using Critical Race Theory and Intersectionality

Super’s (1980, 1996) life-span, life-space approach of career development has had a major influence on the field of career counseling by shifting the focus beyond a ‘singular point of entry’ into to careers to one multiple transition points and trajectories. While Super’s body of theoretical and empirical contributions to the field of career development are vast, the theory does not adequately address the experiences of Black youth. This article focuses on both theory and praxis by discussing the life-span, life-space approach in the context of career development of Black youth. We describe how critical race theory and intersectionality can be used as key organizing principles in an expanded framework along with Super’s life-span, life-space approach to guide practices in college and career counseling. We end with a discussion of the implications for practice

Intrinsic carrier mobility of multi-layered MoS2_2 field-effect transistors on SiO2_2

By fabricating and characterizing multi-layered MoS$_2$-based field-effect transistors (FETs) in a four terminal configuration, we demonstrate that the two terminal-configurations tend to underestimate the carrier mobility $\mu$ due to the Schottky barriers at the contacts. For a back-gated two-terminal configuration we observe mobilities as high as 125 cm$^2$V$^{-1}$s$^{-1}$ which is considerably smaller than 306.5 cm$^2$V$^{-1}$s$^{-1}$ as extracted from the same device when using a four-terminal configuration. This indicates that the intrinsic mobility of MoS$_2$ on SiO$_2$ is significantly larger than the values previously reported, and provides a quantitative method to evaluate the charge transport through the contacts.Comment: 8 pages, 5 figures, typos fixed, and references update

Effective Theories for Circuits and Automata

Abstracting an effective theory from a complicated process is central to the study of complexity. Even when the underlying mechanisms are understood, or at least measurable, the presence of dissipation and irreversibility in biological, computational and social systems makes the problem harder. Here we demonstrate the construction of effective theories in the presence of both irreversibility and noise, in a dynamical model with underlying feedback. We use the Krohn-Rhodes theorem to show how the composition of underlying mechanisms can lead to innovations in the emergent effective theory. We show how dissipation and irreversibility fundamentally limit the lifetimes of these emergent structures, even though, on short timescales, the group properties may be enriched compared to their noiseless counterparts.Comment: 11 pages, 9 figure

Single-grain post-IR IRSL signals of K-feldspars from alluvial fan deposits in Baja California Sur, Mexico

Single grains of K-feldspar from alluvial fan units are dated using a more time-stable signal, the post-infrared infrared stimulated luminescence, or, ‘post-IR IRSL’. A quick measurement protocol is discussed, ‘fast post-IR IRSL,’ that stimulates first with the IR diodes at the lower temperature and then measures grain-by grain at the higher temperature. A criterion is offered for rejecting outlying grains based on hierarchical clustering. Single-grain fading rates are found to diverge from single aliquot fading values, and the fading rates from the brightest subset of grains correspond well with an infinite age cobble and independent age control. Age comparison with a cosmogenic depth-profile age shows agreement at 1σ. The depositional chronology suggests that the climate responsible for regionally-extensive, upper-regime floods which aggraded the older units, transitioned into a climate producing weaker channelized floods around the Late Pleistocene–Holocene transition