113,676 research outputs found
Detection of signals in the ion cyclotron frequency range at the edge during ICRF heating on ASDEX Upgrade
No full textThe ICRF system on ASDEX Upgrade is equipped with an arc detector based on the observation of frequencies between 5 and 25 MHz in the RF feeding line [RI). On some shots, the detector was triggered in an anomalous way: tenths of detections over several hundreds of milliseconds on detectors of all antennas at the same time [R2]. It was suggested that these frequencies were not excited by arcs but came from the plasma. We installed a RF probe inside the vacuum vessel and connected it to a fast acquisition system. We indeed observed frequencies during ICRF heating of several shots. We present here the features of these frequencies, their possible conditions of existence in terms of plasma and RF parameters (magnetic field, density, temperature, RF frequency, power injected) and we compare the source of these frequencies with known phenomena like ICE, CAE and surface waves
Characterization of arcs in frequency domain
No full textArc detection systems are developed for ICRH on ITER to prevent arcs from damaging the RF components. One of the detectors, the Sub-Harmonic Arc Detector (SHAD) is based on the detection of the frequencies emitted in the MHz range by arcs [RI]. To ensure the high level of reliability required for this safety system, it is necessary to demonstrate that these frequencies present a signal with a Signal to Noise Ratio high enough to be detected under the wide range of operational conditions (frequency, power, configuration) and for the different types of arcs that can appear in the feeding lines and on the antennas (vacuum arc, glow discharge, multipactor-induced discharge). For each type of are, we analyze the evolution of the frequency spectrum relative to the evolution of other electrical parameters (reflected power, voltage)
author-bios-SRD-19-0063.R1 – Supplemental material for The Network Structure of Police Misconduct
No full textSupplemental material, author-bios-SRD-19-0063.R1 for The Network Structure of Police Misconduct by George Wood, Daria Roithmayr and Andrew V. Papachristos in Socius</p
Electromagnetic simulations of the ASDEX Upgrade ICRF Antenna with the TOPICA code
No full textAccurate and efficient simulation tools are necessary to optimize the ICRF antenna design for a set of operational conditions. The TOPICA code was developed for performance prediction and for the analysis of ICRF antenna systems in the presence of plasma, given realistic antenna geometries. Fully 3D antenna geometries can be adopted in TOPICA, just as in available commercial codes. But while those commercial codes cannot operate with a plasma loading, the TOPICA code correctly accounts for realistic plasma loading conditions, by means of the coupling with 1D FELICE code. This paper presents the evaluation of the electric current distribution on the structure, of the parallel electric field in the region between the straps and the plasma and the computation of sheaths driving RF potentials. Results of TOPICA simulations will help to optimize and re‐design the ICRF ASDEX Upgrade antenna in order to reduce tungsten (W) sputtering attributed to the rectified sheath effect during ICRF operatio
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
JETP Letters V. 80, I .09
No full textJETP Letters -- November 10, 2004
Volume 80, Issue 9, pp. 575-616
FIELDS, PARTICLES, AND NUCLEI
Redoubled Effect of a Neutron Spin Rotation in Deformed Noncentrosymmetric Crystal for the Bragg Diffraction Scheme
V. V. Fedorov, I. A. Kuznetsov, E. G. Lapin, S. Yu. Semenikhin, and V. V. Voronin
pp. 575-579 Full Text: PDF (93 kB)
CONDENSED MATTER
Manifestation of Geometric Effects in Temperature Behavior of AC Magnetic Response of Josephson Junction Arrays
S. Sergeenkov and F. M. Araujo-Moreira
pp. 580-583 Full Text: PDF (70 kB)
Zero-energy Andreev Surface Bound States in the Lattice Model
A. M. Bobkov
pp. 584-587 Full Text: PDF (54 kB)
Coherent Scattering in a Small Quantum Dot
V. A. Tkachenko, O. A. Tkachenko, Z. D. Kvon, D. G. Baksheev, A. L. Aseev, and J. C. Portal
pp. 588-592 Full Text: PDF (84 kB)
Anomalous Slowing Down of the Longitudinal Spin Relaxation near the Antiferromagnetic Phase Transition in LaMnO3 Manganite
V. A. Atsarkin, V. V. Demidov, and A. M. Balbashov
pp. 593-596 Full Text: PDF (50 kB)
Ultrasonic Study of the Phase Diagram of Methanol
E. L. Gromnitskaya, O. V. Stal'gorova, O. F. Yagafarov, V. V. Brazhkin, A. G. Lyapin, and S. V. Popova
pp. 597-601 Full Text: PDF (83 kB)
Stochastic Description of Phase Separation near the Spinodal Curve in Alloys
V. Yu. Dobretsov, I. R. Pankratov, and V. G. Vaks
pp. 602-607 Full Text: PDF (209 kB)
Electronic, Structural, and Thermal Properties of a Nanocable Consisting of Carbon and BN Nanotubes
A. N. Enyashin, G. Seifert, and A. L. Ivanovskii
pp. 608-611 Full Text: PDF (155 kB)
Observation of Hubbard Bands in gamma-Manganese
S. Biermann, A. Dallmeyer, C. Carbone, W. Eberhardt, C. Pampuch, O. Rader, M. I. Katsnelson, and A. I. Lichtenstein
pp. 612-616 Full Text: PDF (94 kB)Archived web conten
Analysis Of The Impact Of Antenna And Plasma Models On RF Potentials Evaluation
No full textThe design of an Ion Cyclotron (IC) launcher is essentially driven by its coupling properties and its capability of maintaining low parallel electric fields in front of it, indeed providing good power transfer to plasma and avoiding unwanted phenomena such as sheath rectification or hot spots. Both aspects are deeply related to the adopted geometry and the loaded plasma model; the systematic usage of TOPICA code [1], able to precisely take into account a realistic antenna geometry and an accurate plasma description, could certainly help in understanding which elements may have a not negligible effect on the antenna design. This paper presents a detailed comparison, carried out with TOPICA code, between a simplified flat version of one of the IC antennas installed in ASDEX Upgrade experiment and its real curved geometry. The advantages and disadvantages of both geometrical representations are outlined in terms of power transferred to the plasma and with a specific focus on sheath driving potentials. To complete the overview, the importance of an accurate plasma description is also exploite
Proximity effect in superconductor/antiferromagnet hybrids: Neel triplets and impurity suppression of superconductivity
Full text linkTwo possible physical mechanisms of superconductivity suppression at
superconductor/antiferromagnet (S/AF) interfaces, which work even for
interfaces with compensated antiferromagnets, were reported. One of them
suggests that the Neel order of the AF induces rapidly oscillating spin-triplet
correlations in the S layer. They are called Neel triplets, and they suppress
singlet superconductivity. Nonmagnetic disorder destroys this type of triplet
correlations. As a result, the critical temperature of the S/AF bilayer grows
with impurity strength. The second mechanism, on the contrary, suggests that
nonmagnetic impurity scattering suppresses superconductivity in S/AF hybrids.
The predictions were made in the framework of two different quasiclassical
approaches [G. A. Bobkov et al. Phys. Rev. B 106, 144512 (2022) and E. H. Fyhn
et al. arXiv:2210.09325]. Here we suggest the unified theory of the proximity
effect in thin-film S/AF structures, which incorporates both pictures as
limiting cases, and we study the proximity effect at S/AF interfaces for
arbitrary impurity strength, chemical potential, and the value of the Neel
exchange field.Comment: 7 pages, 9 figure
Využití sociálních médií v B2B prodeji
No full textTato diplomová práce se zabývá tím, jak mohou B2B obchodníci využívat sociální média v prodeji. Na základě systematické rešerše literatury, autor zjistil, že akademici, zkoumající danou problematiku, navrhují další výzkum, a to: v kterých konkrétních krocích se dají využít sociální média v prodeji (Salo, 2017). Autor se na základě toho rozhodl zjistit, jaké sociální sítě, různé technologie a pluginy se dají využít v B2B prodeji - tzv. social sellingu. Social selling se v této práci týká primárně procesu akvizice a okrajově péčí o stávající zákazníky. Autor si vybral kvalitativní průzkum pomocí 10 hloubkových polo-strukturovaných rozhovorů, aby odhalil jak, která sociální média to jsou, tak i motivaci prodejců, proč tato média používat/nepoužívat. Aby autor dodržel správnost vyhodnocení výsledků, data byla analyzována pomocí Tématické analýzy, která v této studii vykrystalizovala 2 hlavní strategické přístupy v social sellingu. Tyto přístupy (tzv. Push a Pull strategie) obsahují praktické příklady a konkrétní aktivity, které mohou prodejci využívat v každodenní praxi. Tyto výsledky jsou prezentovány s důrazem na praktičnost a jednoduchost implementace. Tvoří proto hlavní přínos autorovo výzkumu. V poslední části autor zmiňuje výzvy a manažerská doporučení, které mohou obchodníci využít v každodenním pracovním životě.This diploma thesis focuses on social media usage in B2B sales. Based on the systematic literature review conducted by the author, he has found out that recent researchers (Salo, 2017) suggest further research in the area of how and in which sales phase should various social networking sites, technologies and plugins used. To further fill this research gap, author decided to identify these social media and their usage among B2B salespeople in the so-called social selling process. The social selling process in this thesis applies mainly to acquiring new prospects and tangentially to taking care of existing clients (follow-up step). Author has chosen a qualitative research method via conducting 10 in-depth semi-structured interviews to reveal these instruments as well as motivation of a sales person on why to use social media in the selling process. The collected data was analyzed using Thematic analysis to ensure the right procedure and to identify main themes which crystalized into 2 main strategic approaches in social selling. These approaches (Push and Pull) include practical examples of concrete activities which sales people can use in their daily jobs and are presented with focus on practicality and ease of implementation. These also form the main contribution of author`s research. In the last part, author mentions challenges in social selling and recommended managerial implications for salesforce
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