Tuning the proximity effect in a superconductor-graphene-superconductor junction

We have tuned in situ the proximity effect in a single graphene layer coupled to two Pt/Ta superconducting electrodes. An annealing current through the device changed the transmission coefficient of the electrode/graphene interface, increasing the probability of multiple Andreev reflections. Repeated annealing steps improved the contact sufficiently for a Josephson current to be induced in graphene.Comment: Accepted for publication in Phys. Rev.

Lattice paramenter, lattice disorder and resistivity of carbohydrate doepd MgB2 and their correlation with the transition temperature

The change in the lattice parameters or the lattice disorder is claimed as a cause of the slight reduction in the transition temperature by carbon doping in MgB2. In this work, an extensive investigation on the effects of carbohydrate doping has been carried out. It is found that not only the a-axis but also the c-axis lattice parameter increases with the sintering temperature. A linear relation between the unit cell volume and the critical temperature is observed. Compared with the well known correlation between the lattice strain and the critical temperature, the X-ray peak broadening itself shows a closer correlation with the transition temperature. The residual resistivity and the critical temperature are linearly correlated with each other as well and its implication is further discussed.Comment: 3 pages. Accepted by Jouranl of nanoscience and Nanotechnology (JNN

Probing the nucleon structure with CLAS

An overview of recent results with CLAS is presented with emphasis on nucleon resonance studies, nucleon spin structure, and generalized parton distributions.Comment: Plenary talk presented at NSTAR 2007, Bonn, German

Electroexcitation of the P33(1232), P11(1440), D13(1520), S11(1535) at Q^2=0.4 and 0.65(GeV/c)^2

Using two approaches: dispersion relations and isobar model, we have analyzed recent high precision CLAS data on cross sections of \pi^0, \pi^+, and \eta electroproduction on protons, and the longitudinally polarized electron beam asymmetry for p(\vec{e},e'p)\pi^0 and p(\vec{e},e'n)\pi^+. The contributions of the resonances P33(1232), P11(1440), D13(1520), S11(1535) to \pi electroproduction and S11(1535) to \eta electroproduction are found. The results obtained in the two approaches are in good agreement with each other. There is also good agreement between amplitudes of the \gamma^* N \to S11(1535) transition found in \pi and \eta electroproduction. For the first time accurate results are obtained for the longitudinal amplitudes of the P11(1440), D13(1520) and S11(1535) electroexcitation on protons.Comment: 9 pages, 9 figure

Safety and efficacy of transcranial magnetic stimulation (TMS) and repetitive transcranial magnetic stimulation (rTMS) in treatment of major depressive disorder: Systematic reviews and meta-analysis

Background: Prevalence of major depressive disorder allocated significant contribution of disease burden in developed and developing countries because of involving active and productive age groups and communities in recent decades. Different methods are used to manage and treat this disorder that one of them is Transcranial Magnetic Stimulation (TMS). The purpose of this study was assessment of safety, effectiveness and cost-effectiveness of Transcranial Magnetic Stimulation and Repetitive Transcranial Magnetic Stimulation (rTMS) technology in treatment of major depressive disorder. Methods: In order to gather evidence, main databases Cochrane Library, Centre for Reviews and Dissemination (CRD), PubMed, Scopus, Trip, Embase, Inahta, PsycINFO, Google Scholar were searched with appropriate keywords and strategies. After quality assessment of studies, consequences of safety and efficacy of the technology were extracted and Stata 12 software was used, if needed, for meta-analysis. Findings: From a total of 273 studies, 43 studies were entered firstly and 8 studies were selected after final review. The amount of standardised mean difference (SMD) was equal to -0.3 with a %95 confidence interval of -0.82 to 0.23 for rTMS-treated group versus sham group with a substantial rate and significant heterogeneity (P < 0.001, I-Squared = 81.9%). Conclusion: Repetitive Transcranial Magnetic Stimulation is a method with significant and high safety. On other side, its efficacy, compared to sham group, is not very significant. © 2015, Isfahan University of Medical Sciences(IUMS). All rights reserved

Across-wafer nonuniformity of long throw sputter deposition

A. A. Mayo et al., Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures Processing, Measurement, and Phenomena 15, 1788 (1997) https://doi.org/10.1116/1.58952

ANALYSIS OF CERVICAL SPINE INJURY RISK IN SPORTS USING FINITE ELEMENT METHOD

INTRODUCTION: Approximately 10,000 cervical spine injuries occur annually in the United States, with about 1,000 of these injuries resulting from sport-related events (Davis & McKelvey, 1998). In this study, we developed and validated the finite element model of cervical spine, and analyzed cervical spine injury risk using the model

The strong coupling constant from lattice QCD with N_f=2 dynamical quarks

We compute $\Lambda_{\bar{MS}}$ for two flavors of light dynamical quarks using non-perturbatively $O(a)$ improved Wilson fermions. We improve on a recent calculation by employing Pad\'e-improved two-loop and three-loop perturbation theory to convert the lattice numbers to the $\bar{MS}$ scheme.Comment: Contribution to Lattice 2001 (matrix elements), typo correcte