How to trace and hear from doctoral alumni

Currently, in the UK we have knowledge about doctoral holders’ employability and destinations (“doctoral leavers”) from official HESA data. This source assures to know where PhDs bred in the UK work, provided they remain in the UK or go to work in the EU. There is still a dearth of knowledge about those who end to work outside the EU/UK. Among these latter target, arguably the Chinese nationals are the lion share. The statistical relevance of this target of doctoral leavers, and the still poor knowledge of doctoral employability, both concur to the necessity to shed more light in this phenomenon. We are working on building an original dataset from public repositories (Ethos British Library + ORCID) to understand career trajectories of people who got a PhD in the UK some 10 years ago. The final step of this project is sampling some of these leavers. We shall send them a pilot questionnaire to understand, retrospectively, the importance of having attained a PhD in the UK and the respective skills and abilities they developed during doctoral years and afterwards

Noise Rectification and Fluctuations of an Asymmetric Inelastic Piston

We consider a massive inelastic piston, whose opposite faces have different coefficients of restitution, moving under the action of an infinitely dilute gas of hard disks maintained at a fixed temperature. The dynamics of the piston is Markovian and obeys a continuous Master Equation: however, the asymmetry of restitution coefficients induces a violation of detailed balance and a net drift of the piston, as in a Brownian ratchet. Numerical investigations of such non-equilibrium stationary state show that the velocity fluctuations of the piston are symmetric around the mean value only in the limit of large piston mass, while they are strongly asymmetric in the opposite limit. Only taking into account such an asymmetry, i.e. including a third parameter in addition to the mean and the variance of the velocity distribution, it is possible to obtain a satisfactory analytical prediction for the ratchet drift velocity.Comment: 6 pages, 5 figures, to be published on Europhysics Letters; some references have been adde

Mullus argentinae, the Surmullet of southern South America

http://deepblue.lib.umich.edu/bitstream/2027.42/56747/1/OP308.pd

Which is the temperature of granular systems? A mean field model of free cooling inelastic mixtures

We consider a mean field model describing the free cooling process of a two component granular mixture, a generalization of so called Maxwell model. The cooling is viewed as an ordering process and the scaling behavior is attributed to the presence of an attractive fixed point at $v=0$ for the dynamics. By means of asymptotic analysis of the Boltzmann equation and of numerical simulations we get the following results: 1)we establish the existence of two different partial granular temperatures, one for each component, which violates the Zeroth Law of Thermodynamics; 2) we obtain the scaling form of the two distribution functions; 3) we prove the existence of a continuous spectrum of exponents characterizing the inverse-power law decay of the tails of the velocity, which generalizes the previously reported value 4 for the pure model; 4) we find that the exponents depend on the composition, masses and restitution coefficients of the mixture; 5) we also remark that the reported distributions represent a dynamical realization of those predicted by the Non Extensive Statistical Mechanics, in spite of the fact that ours stem from a purely dynamical approach.Comment: 23 pages, 9 figures. submitted for publicatio

TG/FT-IR: An Analysis of the Conditions Affecting the Combined TG/Spectral Response

The results of TG/FT-IR measurements performed on hydrated beta-cyclodextrin at different heating rates and with different carrier gas fluxes are reported. It is shown that the shape of the spectral curve and the its degree of matching with the DTG curves depend on both the TG heating rate and the carrier gas flow rate

Interface pinning and slow ordering kinetics on infinitely ramified fractal structures

We investigate the time dependent Ginzburg-Landau (TDGL) equation for a non conserved order parameter on an infinitely ramified (deterministic) fractal lattice employing two alternative methods: the auxiliary field approach and a numerical method of integration of the equations of evolution. In the first case the domain size evolves with time as $L(t)\sim t^{1/d_w}$, where $d_w$ is the anomalous random walk exponent associated with the fractal and differs from the normal value 2, which characterizes all Euclidean lattices. Such a power law growth is identical to the one observed in the study of the spherical model on the same lattice, but fails to describe the asymptotic behavior of the numerical solutions of the TDGL equation for a scalar order parameter. In fact, the simulations performed on a two dimensional Sierpinski Carpet indicate that, after an initial stage dominated by a curvature reduction mechanism \`a la Allen-Cahn, the system enters in a regime where the domain walls between competing phases are pinned by lattice defects. The lack of translational invariance determines a rough free energy landscape, the existence of many metastable minima and the suppression of the marginally stable modes, which in translationally invariant systems lead to power law growth and self similar patterns. On fractal structures as the temperature vanishes the evolution is frozen, since only thermally activated processes can sustain the growth of pinned domains.Comment: 16 pages+14 figure

Velocity fluctuations in a one dimensional Inelastic Maxwell model

We consider the velocity fluctuations of a system of particles described by the Inelastic Maxwell Model. The present work extends the methods, previously employed to obtain the one-particle velocity distribution function, to the study of the two particle correlations. Results regarding both the homogeneous cooling process and the steady state driven regime are presented. In particular we obtain the form of the pair correlation function in the scaling region of the homogeneous cooling process and show that some of its moments diverge. This fact has repercussions on the behavior of the energy fluctuations of the model.Comment: 16 pages, 1 figure, to be published on Journal of Statistical Mechanics: Theory and Experiment

Anisotropic excitonic effects in the energy loss function of hexagonal boron nitride

We demonstrate that the valence energy-loss function of hexagonal boron nitride (hBN) displays a strong anisotropy in shape, excitation energy and dispersion for momentum transfer q parallel or perpendicular to the hBN layers. This is manifested by e.g. an energy shift of 0.7 eV that cannot be captured by single-particle approaches and is a demonstration of a strong anisotropy in the two-body electron-hole interaction. Furthermore, for in-plane directions of q we observe a splitting of the -plasmon in the M direction that is absent in the K direction and this can be traced back to band-structure effects.Comment: 10 pages, 4 figure

Upaya Peningkatan Hasil Belajar Pengukuran Waktu Melalui Media Jam Pintar Pada Siswa Kelas Iii-a Sdn Tlogomas 2 Kota Malang

Proses pembelajaran tanpa media yang konkret akan mengakibatkan siswa kesulitan untuk memahami suatu konsep sehingga media konkret sangat dibutuhkan dalam proses pembelajaran agar siswa lebih mudah memahami konsep. Selain itu, pemilihan media juga perlu dipertimbangkan. Pemilihan media yang tepat akan meningkat hasil belajar siswa dan membuat siswa lebih fokus selama proses pembelajaran. Penelitian ini membahas penggunaan Jam Pintar sebagai salah satu media konkret yang dapat digunakan sebagai upaya peningkatan hasil belajar siswa tentang pengukuran waktu. Penelitian ini menunjukkan penerapan Jam Pintar dpat meningkatkan hasil belajar siswa kelas III-A SDN Tlogomas 2 Kota Malang yang pada tahap pra siklus 16,6%, meningkat menjadi 56,6% pada siklus I dan meningkat menjadi 83,3% pada siklus II