Peculiarities of electromagnetic field oscillations of a charged particle rotating about a conductive ball

The paper investigates some characteristic features of the electromagnetic field of a relativistic charged particle that uniformly rotatesabout a conductive ball in its equatorial plane. It is assumed that the braking of the particle due to radiation is compensatedby an external influence (e.g. the electric force) that compels the particle to turn uniformly in a circle. The magnetic permittivityof the ball is assumed to be one. The work is based on the corresponding exact analytic solutions of Maxwell’s equations. The generalizedDrude-Lorentz-Sommerfeld formula for the dielectric function of the conductive ball is used in numerical calculations.It is shown that localized oscillations of a high-amplitude electromagnetic field can be generated at a given harmonic inside the ballat a certain (resonant) particle rotation frequency at a small distance from the surface of the ball. Herewith, at large distances fromthe trajectory of the particle, these localized oscillations are accompanied by intense radiation at the same harmonic, which is manytimes more intense than the analogous radiation in the case when the ball is absent.The possibilities of using this phenomenon to develop sources of quasi-monochromatic electromagnetic radiation in the range fromgiga- to terra hertz frequencies are discussed

Correlation Effects in Nuclear Transparency

The Glauber approximation is used to calculate the contribution of nucleon correlations in high-energy $A(e,e'N)$ reactions. When the excitation energy of the residual nucleus is small, the increase of the nuclear transparency due to correlations between the struck nucleon and the other nucleons is mostly compensated by a decrease of the transparency due to the correlations between non detected nucleons. We derive Glauber model predictions for nuclear transparency for the differential cross section when nuclear shell level excitations are measured. The role of correlations in color transparency is briefly discussed.Comment: 24 pages revtex, 4 uuencoded PostScript Figures as separate fil

Color Transparency Effects in Electron Deuteron Interactions at Intermediate Q^2

High momentum transfer electrodisintegration of polarized and unpolarized deuterium targets, $d(e,e'p)n$ is studied. We show that the importance of final state interactions-FSI, occuring when a knocked out nucleon interacts with the other nucleon, depends strongly on the momentum of the spectator nucleon. In particular, these FSI occur when the essential contributions to the scattering amplitude arise from internucleon distances $\sim 1.5~fm$. But the absorption of the high momentum $\gamma^*$ may produce a point like configuration, which evolves with time. In this case, the final state interactions probe the point like configuration at the early stage of its evolution. The result is that significant color transparency effects, which can either enhance or suppress computed cross sections, are predicted to occur for $\sim 4 GeV^2 \ge Q^2\leq~10~(GeV/c)^2$.Comment: 37 pages LaTex, 12 uuencoded PostScript Figures as separate file, to be published in Z.Phys.

Operation and performance of the ATLAS Tile Calorimeter in Run 1

The Tile Calorimeter is the hadron calorimeter covering the central region of the ATLAS experiment at the Large Hadron Collider. Approximately 10,000 photomultipliers collect light from scintillating tiles acting as the active material sandwiched between slabs of steel absorber. This paper gives an overview of the calorimeter’s performance during the years 2008–2012 using cosmic-ray muon events and proton–proton collision data at centre-of-mass energies of 7 and 8TeV with a total integrated luminosity of nearly 30 fb−1. The signal reconstruction methods, calibration systems as well as the detector operation status are presented. The energy and time calibration methods performed excellently, resulting in good stability of the calorimeter response under varying conditions during the LHC Run 1. Finally, the Tile Calorimeter response to isolated muons and hadrons as well as to jets from proton–proton collisions is presented. The results demonstrate excellent performance in accord with specifications mentioned in the Technical Design Report

SCIENTIFIC COOPERATION BETWEEN ARMENIAN AND THE EAEU: REALITY AND DEVELOPMENT TRENDS

The aim of this article is to analyze and assess the scientific collaboration between the Republic of Armenia (RA) and the Eurasian Economic Union (EAEU) member-states.In the Introduction, the article dwells into the integration processes that started right after the collapse of the Soviet Union with a main emphasis on the EAEU. The situation in the scientific sphere in Armenia is presented briefly, followed by highlighting the role of international scientific collaboration as a way to overcome a crisis in the science field.The role of the Committee of Sciences of the RA in the development of international collaboration is emphasized. The first steps in the framework of EAEU to activate scientific-technical cooperation are stressed.The Materials and Methods Section outlines the databases on which the study is based, that are the Web of Science Core Collection (WOS CC) and the Russian Science Citation Index (RSCI). The timeframe for the data retrieved from the WOS CC is 1991–2016, while for the RSCI — 2005–2016. The types of collaborations, as well as five stages of research — data retrieval from the WOS CC and the RSCI, data cleaning, quantitative analysis of citation, quantitative analysis of co-authored papers of the RA with each EAEU member-state and the distribution of the co-authored papers by the scientific fields — are mentioned.The Results Section presents the results of the study by the five mentioned stages and the relevant analysis.The Discussion and Conclusion Section presents the main conclusions of the study. It mainly stresses that Russia is the main scientific partner of Armenia, followed by Belarus. Scientific collaboration of Armenia with Kazakhstan and Kirgizia are on a very low level. Physics was recognized to be the leading field of collaboration. Generally, the article concludes that it is too early to speak about the role of the EAEU in the development of scientific collaboration between the member-states. In order to assure a stable growth of collaboration among the EAEU member-states a huge work should be done

Shock Wave Generated Megahertz Radiation of Atmosphere

International audienceBased on intuitive reasoning and a simple mathematical model, it is shown that the radio frequency electromagnetic radiation in 1-2-MHz range is generated during the propagation of a directed strong shock wave in air. It is due to the radiation from free electrons (which are produced by the shock wave) in the magnetic field of the earth. The possibility of detection of this radiation is discusse

Analysis of the patients' quality of life after radical cystectomy with the orthotopic neobladder or ileal conduit formation

Introduction. Orthotopic neobladder or ileal conduit are the most optimal and common methods of intestinal urine diversion. Nevertheless, there is no consensus in the current literature as to which of these urine diversion techniques provides a better quality of life.Purpose of the study. To conduct a comparative study of the quality of life of patients who underwent radical cystectomy with the formation of an orthotopic neobladder or ileoconduit.Materials and methods. The study included 60 patients (46 men (76.6%) and 14 (23.4%) women) who underwent radical cystectomy (RCE) with intestinal urine diversion. The mean age of the patients was 66 (47 - 85) years. The exclusionary criteria for the study were: neoadjuvant chemotherapy for bladder cancer; preoperative ASA IV - V degree; RCE with intestinal urine diversion not for bladder cancer; the inability to fill out questionnaires assessing the postoperative aspects of the quality of life (QoL) for certain reasons. All patients were divided into 2 groups to allow comparative analysis: Group I — 26 patients (43.3%) underwent RCE with the formation of an orthotopic neobladder according to the Studer method; Group II — 34 patients (56.7%) underwent RCE with the formation of an ileal conduit according to Bricker. The median follow-up period for patients from the completed surgical procedure to the survey was 7 months (4.5 - 9.5 months). The monitoring of the postoperative patients' QoL after RCE was carried out based on the questionnaires: EORTC QLQ-C30, EORTC QLQ-BLM. Also, we carried out a retrospective comparative analysis of early postoperative complications and mortality after RCE in both groups due to Clavien-Dindo classification.Results. The mean time of surgery in Groups I was 280 ± 56.3 min, in Group II — 230 ± 60.8 minutes, (p = 0.117), median blood loss was 350 ml (283 - 380) in Group 1 with 270 (245 - 310) ml in Group 2 (p = 0.213). The frequency of complications according to Clavien-Dindo I - II in the Group 1 was observed in 11 (42.3%) patients, in the Group 2 in 12 (35.2%) patients (p = 0.579), complications according to Clavien-Dindo III - IV in the Group 1 were found in 5 (19.2%) patients while in the Group 2 in 7 (20.5%) patients (p = 0.896). The mortality rate was 8.3% (5 people) and there is no statistically significant difference in the mortality rate in both groups of patients (p = 0.241). Based on the analysis of the QLQ-C30 and QLQ-BLM questionnaire data, we noted that a total of «good» quality of life in the Group 1 was noted by up to 18 (69.2%) patients compared with the Group 2 in up to 15 (44.1%) patients (p < 0.05). At the same time, the predominance of the QoL was observed on all the main scales of the QLQ-C30 questionnaire: the scale of physical condition, cognitive functions, emotional state and social adaptation. According to the results of the QLQ-C30 questionnaire, there were more financial in the group of patients with an ileal conduit. In the postoperative period, the following symptoms prevailed in both groups of patients: nausea, vomiting, weakness and pain. During the analysis of the functional results, we noted that in Group I,4 (15.3%) patients had nocturnal and daytime urinary incontinence, 2 (7.6%) patients required self-catheterization of the intestinal reservoir periodically, in Group II — 8 (23.5%) patients report urine leakage from the urostomy and skin dermatitis periodically.Conclusion. Despite the fact of worldwide recognition as a result of the preferences of surgeons in favour of the ileal conduit formation by the Bricker technique during RCE, urine diversion using orthotopic neobladder demonstrates better results with analysis of QoL in our patients. Obviously, long-term studies with a large sample of patients are required to obtain more reliable results of a QoL evaluation after RCE with intestinal urine diversion