Contribution of magnetotail reconnection to the cross-polar cap electric potential drop

Since the work of Dungey (1961), the global circulation pattern with two (dayside and nightside) reconnection regions has become a classic concept. However, the contributions of dayside and nightside sources to the cross-polar cap potential (PCP) are not fully understood, particularly, the relative role and specifics of the nightside source are poorly investigated both in quantitative and qualitative terms. To fill this gap, we address the contributions of dayside and nightside sources to the PCP by conducting global MHD simulations with both idealized solar wind input and an observed event input. The dayside source was parameterized by solar wind–based “dayside merging potential” Φd = LeffVBt sin4(θ/2), whereas to characterize the nightside source we integrated across the tail the dawn-dusk electric field in the plasma sheet (to obtain the “cross-tail potential” Φn). For the idealized run we performed simulations using four MHD codes available at the Community Coordinated Modeling Center to show that contribution of the nightside source is a code-independent feature (although there are many differences in the outputs provided by different codes). Particularly, we show that adding a nightside source to the linear fit function for the ionospheric potential (i.e., using the fit function Φfit = KdΦd + KnΦn + Φ0) considerably improves the fitting results both in the idealized events as well as in the simulation of an observed event. According to these simulations the nightside source contribution to the PCP has a fast response time (<5 min) and a modest efficiency (potential transmission factor from tail to the ionosphere is small, Kn < 0.2), which is closely linked to the primarily inductive character of strong electric field generated in the plasma sheet. The latter time intervals are marked by strongly enhanced nightside (lobe) reconnection and can be associated with substorm expansion phases. This association is further strengthened by the simulated patterns of precipitation, the R1-type field-aligned substorm current wedge currents and Hall electrojet currents, which are consistent with the known substorm signatures

Corrigendum to "Time-varying magnetotail magnetic flux calculation: a test of the method" published in Ann. Geophys., 27, 1583&ndash;1591, 2009

No abstract available

The role of time management in the self-organisation of the individual within an effective self-marketing model

The study determines the role of time management in the self-organisation of a person oriented towards successful career development, identifies opportunities and ways of self-organisation within the effective self-marketing model. Two tests have been conducted among two hundred respondents of the following categories: non-working students, working students, freelancers, specialists, middle managers and top managers. The first testing allowed us to identify differences in the structure of timing during the day by categories of respondents. Based on the second test survey, six base effective time management factors have been analysed: consistency, purposefulness, perseverance, fixation (on structuring activities), self-organisation (through external means), orientation to the present. The results of the study confirm the need for time management, its competent distribution and budgeting, and effective use in the context of the self-organisation unit of the effective self-marketing model

Observation of nuclei with energies 8-30 MeV per nucleon in the Earth's magnetosphere at the altitudes 350 KM

Observations of the flux of nuclei with an energy of IO MeV per nucleon on the Salyut-7 Station in September 1984 are presented. The observed flux is smaller by a factor of 50 than the flux detected in May, 1981

Structure of the glial cells in the nervous system of parasitic and free-living flatworms

This study is devoted to ultrastructural and immunosytochemical investigation of the nervous system in parasitic and free-living platyhelminthes to learn if glial cells exist in the nervous system of flatworms. We described the ultrastructure of different types of glial cells and the peculiarities of myelinization of gigantic axons; immunoreactivity to the S100b protein is revealed. Comparative analysis of the glia structure of annelids and platods is given; structural, functional, and evolutionary aspects of myelinization of gigantic axons, which are revealed in cestodes, are discussed. © 2010 Pleiades Publishing, Ltd

Explosions and periodic tremor at Karymsky volcano, Kamchatka, Russia: Explosions and periodic tremor at Karymsky volcano

The explosions of Karymsky volcano often produce signals containing a sequence of repeating pulses recorded on acoustic and seismic sensors, known as chugging. The amplitudes of these pulses correlate with the time interval between pulses. For a given measured acoustic pressure, seismic amplitudes take on arbitrary values up to a specific, empirically determined threshold. Conversely, events with a small seismic amplitude yielded acoustic waves with large variations and large-amplitude seismic events corresponded to large acoustic waves. These observations are not consistent with a source modelled by a resonating conduit. Rather, a model consisting of a sequence of discrete pulses explains the data and provides a framework for understanding the dynamics of degassing at the vent. The physical model for chugging involves a time-varying narrowing vent where gasses are released in a series of oscillations which appear to be harmonic but instead are modelled as short-term transients, or discrete pulses, suggestive of choked flow

Analysis of advanced IGCC economic indicators

In this paper, the influence presence of a shift reactor and a CO2 removal unit (CCS) from syngas (pre-combustion technology) on the thermal efficiency of a combined-cycle plant with in-cycle gasification of solid fuel (IGCC) is considered. The literature sources on the effect of CCS on the thermal efficiency of three oxygen IGCC are analyzed. The calculated influence of the degree of integration of CCS in the demonstration IGCC scheme on the composition of the combusted gas fuel is presented. The principle of shift-reactor operation is given. Various types of catalysts used in the shift reactor are considered. The influence of CCS on the economic and environmental indicators of IGCC is analyzed. The analysis of air IGCC schemes with CCS node and without it is carried out.В данной работе рассматривается влияние наличия shift-реактора и узла удаления СО2 (CCS) из синтез-газа (технология pre-combustion) на термический КПД перспективной парогазовой установки с внутрицикловой газификацией твёрдого топлива (ПГУ-ВЦГ). Проведен анализ литературных источников по влиянию CCS на термический КПД трёх кислородных ПГУ-ВЦГ. Представлено расчетное влияние степени интеграции CCS в схему демонстрационной ПГУ-ВЦГ на состав сжигаемого газового топлива. Приводится принцип работы shift-реактора. Рассматриваются различные типы катализаторов, используемых в shift-реакторе. Проанализировано влияние CCS на экономические и экологические показатели ПГУ-ВЦГ. Проведен анализ схем перспективной воздушной ПГУ-ВЦГ с узлом CCS и без него

Josephson Vortex States in Intermediate Fields

Motivated by recent resistance data in high $T_c$ superconductors in fields {\it parallel} to the CuO layers, we address two issues on the Josephson-vortex phase diagram, the appearances of structural transitions on the observed first order transition (FOT) curve in intermediate fields and of a lower critical point of the FOT line. It is found that some rotated pinned solids are more stable than the ordinary rhombic pinned solids with vacant interlayer spacings and that, due to the vertical portion in higher fields of the FOT line, the FOT tends to be destroyed by creating a lower critical point.Comment: 12 pages, 3 figures. To appear in J.Phys.Soc.Jpn. 71, No.2 (February, 2002