1,611 research outputs found
Should we care about teacher diversity? Student perceptions of teachers of the same race
As student diversity increases in many schools across the globe, teacher diversity may not be keeping pace with the ever changing student population. Along with this comes an increasing number of issues and queries around race and education. The ideas surrounding how race impacts the education of students have been shrouded in controversy given the sensitive nature of the topic and its troubled
past in some countries. Countries across the world struggle to recruit a teacher workforce that matches that of the student population especially in pockets where there are a larger number of minorities students. Many education programs, policies, and interventions more recently have been reasserting the ways that addressing issues with race in schools can be a positive change, specifically seeking to diversify teacher recruitment and match teachers or mentors with groups of students based on race to serve as built- in role models. Indeed, our increased awareness of teacher recruitment practices and the need for a more diverse teaching force is based on some of those assumptions that student/teacher race matching is and can be a positive thing. This pilot study seeks to examine these assumptions by looking at how race may actually affect teacher-student relationships.
This study focuses on students and teachers in a low-income area of the United States to assess student perceptions of their teachers on several key attributes of quality teaching. The aim of the study is to see if classrooms of students with similar races to that of their teacher perceive their teachers differently. More directly, do students share more favorable perceptions of their teachers if they are of the same racial background? This study finds that students perceive that teachers of the same race
are more effective and have more positive relationships with them. The paper concludes with a call for more research and a continued push to diversity the teacher workforce worldwide
Comments
A supplementary article added to the briefing document as a reaction piece to the discussions held at the seminar. The article asks the Welsh government and Welsh schools to support ITE providers in England by requesting that NCTL and DfE do not penalise providers for supporting or encouraging trainees to teach in Wales
Exploiting Aging Benefits for the Design of Reliable Drowsy Cache Memories
In this paper, we show how beneficial effects of aging on static power consumption can be exploited to design
reliable drowsy cache memories adopting dynamic voltage scaling(DVS) to reduce static power. First, we develop an analytical model allowing designers to evaluate the long-term threshold voltage degradation induced by bias temperature instability (BTI)in a drowsy cache memory. Through HSPICE simulations, we demonstrate that, as drowsy memories age, static power reduction techniques based on DVS become more effective because of reduction in sub-threshold current due to BTI aging. We develop a simulation framework to evaluate trade-offs between
static power and reliability, and a methodology to properly select the “drowsy” data retention voltage. We then propose different architectures of a drowsy cache memory allowing designers to meet different power and reliability constraints. The performed HSPICE simulations show a soft error rate and static noise margin improvement up to 20.8% and 22.7%, respectively, compared to standard aging unaware drowsy technique. This is achieved with a limited static power increase during the very early lifetime, and with static energy saving of up to 37% in 10 years of operation, at no or very limited hardware overhead
Significance of electrokinetic characterization for interpreting interfacial phenomena at planar, macroscopic interfaces
Journal ArticleStreaming potential measurements provide valuable information for the validation and interpretation of interfacial phenomena that occur at flat macroscopic surfaces. Planar substrates have been extensively used for the interpretation of events, which occur at particulate surfaces; however, these flat surfaces are often only questionably representative of their particulate counterparts due to variations in surface chemistry and topography. In this study, the zeta potential from planar macroscopic surfaces of PMMA, mica, graphite, fluorite, and calcite have been calculated from streaming potentials measured in aqueous solutions using an asymmetric clamping cell. These zeta potentials have been found to significantly contribute to understanding and interpretation of interfacial phenomena influenced by Coulombic interactions including adsorption, surface forces, and the structure of surface micelles
Fault-tolerance techniques for hybrid CMOS/nanoarchitecture
The authors propose two fault-tolerance techniques for hybrid CMOS/nanoarchitecture implementing logic functions as look-up tables. The authors compare the efficiency of the proposed techniques with recently reported methods that use single coding schemes in tolerating high fault rates in nanoscale fabrics. Both proposed techniques are based on error correcting codes to tackle different fault rates. In the first technique, the authors implement a combined two-dimensional coding scheme using Hamming and Bose-Chaudhuri-Hocquenghem (BCH) codes to address fault rates greater than 5. In the second technique, Hamming coding is complemented with bad line exclusion technique to tolerate fault rates higher than the first proposed technique (up to 20). The authors have also estimated the improvement that can be achieved in the circuit reliability in the presence of Don-t Care Conditions. The area, latency and energy costs of the proposed techniques were also estimated in the CMOS domain
Exact solutions in a scalar-tensor model of dark energy
We consider a model of scalar field with non minimal kinetic and Gauss Bonnet
couplings as a source of dark energy. Based on asymptotic limits of the
generalized Friedmann equation, we impose restrictions on the kinetic an
Gauss-Bonnet couplings. This restrictions considerable simplify the equations,
allowing for exact solutions unifying early time matter dominance with
transitions to late time quintessence and phantom phases. The stability of the
solutions in absence of matter has been studied.Comment: 30 pages, 2 figures, to appear in JCA
On the Two Spectra Inverse Problem for Semi-Infinite Jacobi Matrices
We present results on the unique reconstruction of a semi-infinite Jacobi
operator from the spectra of the operator with two different boundary
conditions. This is the discrete analogue of the Borg-Marchenko theorem for
Schr{\"o}dinger operators in the half-line. Furthermore, we give necessary and
sufficient conditions for two real sequences to be the spectra of a Jacobi
operator with different boundary conditions.Comment: In this slightly revised version we have reworded some of the
theorems, and we updated two reference
Cluster of Dipolar Coupled Spins as a Quantum Memory Storage
Spin dynamics of a cluster of coupled spins 1/2 can be manipulated to store
and process a large amount of information. A new type of dynamic response makes
it possible to excite coherent long-living signals, which can be used for
exchanging information with a mesoscopic quantum system. An experimental
demonstration is given for a system of 19 proton spins of a liquid crystal
molecule.Comment: 5 pages, 1 figur
Exact two-particle eigenstates in partially reduced QED
We consider a reformulation of QED in which covariant Green functions are
used to solve for the electromagnetic field in terms of the fermion fields. It
is shown that exact few-fermion eigenstates of the resulting Hamiltonian can be
obtained in the canonical equal-time formalism for the case where there are no
free photons. These eigenstates lead to two- and three-body Dirac-like
equations with electromagnetic interactions. Perturbative and some numerical
solutions of the two-body equations are presented for positronium and
muonium-like systems, for various strengths of the coupling.Comment: 33 pages, LaTex 2.09, 4 figures in EPS forma
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