Universal R-C crossover in current-voltage characteristics for unshunted array of overdamped Nb-AlO_x-Nb Josephson junctions

We report on some unusual behavior of the measured current-voltage characteristics (CVC) in artificially prepared two-dimensional unshunted array of overdamped Nb-AlO_x-Nb Josephson junctions. The obtained nonlinear CVC are found to exhibit a pronounced (and practically temperature independent) crossover at some current I_{cr}=\left(\frac{1}{2\beta_C}-1\right)I_C from a resistance R dominated state with V_R=R\sqrt{I^2-I_C^2} below I_{cr} to a capacitance C dominated state with V_C=\sqrt{\frac{\hbar}{4eC}} \sqrt{I-I_C} above I_{cr}. The origin of the observed behavior is discussed within a single-plaquette approximation assuming the conventional RSJ model with a finite capacitance and the Ambegaokar-Baratoff relation for the critical current of the single junction

Manifestation of geometric resonance in current dependence of AC susceptibility for unshunted array of Nb-AlOx-Nb Josephson junctions

A pronounced resonance-like structure has been observed in the current dependence of AC susceptibility for two-dimensional array of unshunted Nb-AlOx-Nb Josephson junctions. Using a single-plaquette approximation, we were able to successfully fit our data assuming that resonance structure is related to the geometric (inductive) properties of the array.Comment: to appear in Physica C (in press

Organisational Identity as a Barrier to Widening Access in Scottish Universities

Widening access policy has historically focused on tackling the socioeconomic barriers to university access faced by prospective students from under-represented groups, but increasingly policy makers are seeking to also address the barriers to wider access posed by undergraduate admissions policies. In this vein, the Scottish Government has recently called upon universities to set separate academic entry requirements for socioeconomically disadvantaged applicants which recognise that “the school attainment of disadvantaged learners often does not reflect their full potential” and which better reflect the minimum needed to succeed in higher education. In this paper, we draw on in-depth interviews with admissions personnel at eighteen Scottish universities to explore the scope for more progressive admissions policies of this kind in light of universities’ identities as organisations and in light of corresponding organisational strategies for position-taking in global and national higher education fields. We present a theoretical model and an empirical illustration of three hierarchically-ordered ideal types of organisational identity—globally competitive, nationally selective, and locally transformative—and show that the more dominant of these tend to constrain the development of more progressive admissions policies. This is because globally competitive and, to a lesser extent, nationally selective organisational identities are understood to require admission of the ‘brightest and best’, conceptualised as those with the highest levels of prior academic attainment who can be expected to succeed at university and beyond as a matter of course. We conclude that universities must recognise and redress the implicitly exclusionary nature of their organisational identities if genuine progress on widening access is to be made

Irrigated rice area estimation using remote sensing techniques: Project's proposal and preliminary results

The development of a methodology for annual estimates of irrigated rice crop in the State of Rio Grande do Sul, Brazil, using remote sensing techniques is proposed. The project involves interpretation, digital analysis, and sampling techniques of LANDSAT imagery. Results are discussed from a preliminary phase for identifying and evaluating irrigated rice crop areas in four counties of the State, for the crop year 1982/1983. This first phase involved just visual interpretation techniques of MSS/LANDSAT images

Positive APPtidude: from social entrepreneurship to ICT programming

ICT programming project for the creation of applications for mobile devices developed with 5th grade students of the 2nd and 3rd Cycles classes of André Soares Basic School in Bragainfo:eu-repo/semantics/publishedVersio

Theranostics Through the Synergistic Cooperation of Heterometallic Complexes

Heterometallic drugs are emerging as a great alternative to conventional metallodrugs. Careful selection of different metallic fragments makes possible to enhance not only the therapeutic potential by a synergistic effect, but also to incorpore key features like traceability. Drugs that integrate traceability and therapy in one system are known as theranostic agents. In cancer research, theranostic agents are becoming increasingly important. They deliver crucial information regarding their biological interplay that can ultimately be used for optimization. The well-established therapeutic potential of PtII-, RuII- and AuI-based drugs combined with the outstanding optical properties of d6 transition metal complexes grant the delivery of traceable metallodrugs. These species can be easily fine-tuned through modification of their respective ligands to provide a new generation of drugs