scholarly journals Theoretical Description of the Superconducting State of Nanostructures at Intermediate Temperatures: A Combined Treatment of Collective Modes and Fluctuations

2012 ◽  
Vol 108 (9) ◽  
Author(s):  
Pedro Ribeiro ◽  
Antonio M. García-García
Keyword(s):  
Superconducting State ◽  
Combined Treatment ◽  
Theoretical Description ◽  
Collective Modes

scholarly journals FIELD THEORETICAL DESCRIPTION OF THE SUPERCONDUCTING STATE

1955 ◽  
Vol 33 (11) ◽  
pp. 679-692 ◽  
Author(s):  
Robert E. Pugh
Keyword(s):  
Superconducting State ◽  
Equations Of Motion ◽  
Theoretical Description ◽  
Field Equations ◽  
Plasma Oscillations ◽  
Electromagnetic Potentials ◽  
Self Consistent ◽  
Modes Of Vibration ◽  
Linear Field ◽  
Transverse Oscillations

The superconducting state is described in terms of the electronic plasma in interaction with the electromagnetic potentials. The interaction of the plasma with itself and with the lattice is represented by a potential energy determined such that the equations of motion are self-consistent. The resulting non-linear field equations are solved in the linear approximation. There exist four independent modes of vibration of the field variables corresponding to the plasma oscillations, and one longitudinal and two transverse oscillations of the electromagnetic potentials. The contribution of these modes to the specific heat is discussed.

Density waves in disk galaxies

1967 ◽  
Vol 31 ◽  
pp. 313-317 ◽  
Author(s):  
C. C. Lin ◽  
F. H. Shu
Keyword(s):  
Mathematical Analysis ◽  
Spiral Structure ◽  
Stellar System ◽  
Collective Modes ◽  
Disk Galaxies ◽  
Spiral Pattern ◽  
Density Waves ◽  
The Galaxy ◽  
Detailed Mathematical Analysis

Density waves in the nature of those proposed by B. Lindblad are described by detailed mathematical analysis of collective modes in a disk-like stellar system. The treatment is centered around a hypothesis of quasi-stationary spiral structure. We examine (a) the mechanism for the maintenance of this spiral pattern, and (b) its consequences on the observable features of the galaxy.

Observation by HVEM of the martensite transformation and the superconducting transition in Nb3Sn

1988 ◽  
Vol 46 ◽  
pp. 788-789
Author(s):  
M. A. Kirk ◽  
M. C. Baker ◽  
B. J. Kestel ◽  
H. W. Weber
Keyword(s):  
Thin Films ◽  
Low Temperature ◽  
Superconducting State ◽  
Martensite Transformation ◽  
Sputter Deposition ◽  
Diffusion Reaction ◽  
Solute Diffusion ◽  
Superconducting Transition ◽  
Twin Boundaries ◽  
Martensite Structure

It is well known that a number of compound superconductors with the A15 structure undergo a martensite transformation when cooled to the superconducting state. Nb3Sn is one of those compounds that transforms, at least partially, from a cubic to tetragonal structure near 43 K. To our knowledge this transformation in Nb3Sn has not been studied by TEM. In fact, the only low temperature TEM study of an A15 material, V3Si, was performed by Goringe and Valdre over 20 years ago. They found the martensite structure in some foil areas at temperatures between 11 and 29 K, accompanied by faults that consisted of coherent twin boundaries on {110} planes. In pursuing our studies of irradiation defects in superconductors, we are the first to observe by TEM a similar martensite structure in Nb3Sn.Samples of Nb3Sn suitable for TEM studies have been produced by both a liquid solute diffusion reaction and by sputter deposition of thin films.

Hybrid treatment of multilevel revascularization in patients with peripheral arterial disease – a multi-centre study in Korea

VASA ◽  
2018 ◽  
Vol 47 (3) ◽  
pp. 235-241 ◽  
Author(s):  
Soon Cheon Lee ◽  
Jin Hyun Joh ◽  
Jeong-Hwan Chang ◽  
Hyung-Kee Kim ◽  
Jang Yong Kim ◽  
...  
Keyword(s):  
Endovascular Treatment ◽  
Combined Treatment ◽  
Ankle Brachial Index ◽  
Primary Patency ◽  
Limb Ischaemia ◽  
University Hospitals ◽  
Multi Centre Study ◽  
Free Survival ◽  
Technical Success Rate ◽  
Hybrid Treatment

Abstract. Background: Endovascular treatment is an alternative first-line management for peripheral artery disease (PAD). Hybrid treatment (HT) is defined as a combined treatment for patients with PAD using endovascular and open surgery, simultaneously performed in an operating room. The results of HT are reportedly good for multilevel revascularization (MR) in patients with chronic limb ischaemia, and even in older high-risk patients. The goal of this study was to examine the clinical and haemodynamic outcomes of HT in patients who need MR. Patients and methods: Nine university hospitals in Korea participated in this multicentre study. A total of 134 patients with multilevel PAD underwent HT and MR. Patients were enrolled from July 2014 to June 2015 and were followed for 18 months. Results: The mean age of the patients was 68.8 ± 9.93 years and 88.1 % were men. Patients with Rutherford category 2 to 3 and 4 to 6 comprised 59.0 % and 42.0 % of the group, respectively. The technical success rate was 100 %. The primary patency rates at 12 and 18 months were 77.6 % and 63.9 %, respectively. The primary-assisted patency rates at 12 and 18 months were both 90.0 %. The pre-operative mean ankle brachial index (0.43 ± 0.23) increased to 0.87 ± 0.23 at six months post-operatively (t-test, p < 0.05). The amputation free survival rate was 97.1 %. Conclusions: Although outcomes of multilevel PAD are reportedly poor when endovascular treatment alone is used, we have shown that HT is a feasible alternative modality for patients with multilevel PAD, with satisfactory amputation-free survival and freedom from re-intervention rates.

A Case of Catatonia in a 14-Year-Old Girl with Schizophrenia Treated with Electroconvulsive Therapy

2013 ◽  
Vol 41 (1) ◽  
pp. 69-74 ◽  
Author(s):  
Frank Häßler ◽  
Olaf Reis ◽  
Steffen Weirich ◽  
Jacqueline Höppner ◽  
Birgit Pohl ◽  
...  
Keyword(s):  
Case Report ◽  
Treatment Response ◽  
Electroconvulsive Therapy ◽  
Rating Scale ◽  
Combined Treatment ◽  
Adolescent Patient

This article presents a case of a 14-year-old female twin with schizophrenia who developed severe catatonia following treatment with olanzapine. Under a combined treatment with amantadine, electroconvulsive therapy (ECT), and (currently) ziprasidone alone she improved markedly. Severity and course of catatonia including treatment response were evaluated with the Bush-Francis Catatonia Rating Scale (BFCRS). This case report emphasizes the benefit of ECT in the treatment of catatonic symptoms in an adolescent patient with schizophrenic illness.

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