445 research outputs found
The intrinsic Baldwin effect in broad Balmer lines of six long-term monitored AGNs
We investigate the intrinsic Baldwin effect (Beff) of the broad H and
H emission lines for six Type 1 active galactic nuclei (AGNs) with
different broad line characteristics: two Seyfert 1 (NGC 4151 and NGC 5548),
two AGNs with double-peaked broad line profiles (3C 390.3 and Arp 102B), one
narrow line Seyfert 1 (Ark 564), and one high-luminosity quasar with highly red
asymmetric broad line profiles (E1821+643). We found that a significant
intrinsic Beff was present in all Type 1 AGNs in our sample. Moreover, we do
not see strong difference in intrinsic Beff slopes in different types of AGNs
which probably have different physical properties, such as inclination, broad
line region geometry, or accretion rate. Additionally, we found that the
intrinsic Beff was not connected with the global one, which, instead, could not
be detected in the broad H or H emission lines. In the case of
NGC 4151, the detected variation of the Beff slope could be due to the change
in the site of line formation in the BLR. Finally, the intrinsic Beff might be
caused by the additional optical continuum component that is not part of the
ionization continuum.Comment: 12 pages, 8 figures, Accepted for publication in A&
Long-term monitoring of the broad-line region properties in a selected sample of AGN
We present the results of the long-term optical monitoring campaign of active
galactic nuclei (AGN) coordinated by the Special Astrophysical Observatory of
the Russian Academy of Science. This campaign has produced a remarkable set of
optical spectra, since we have monitored for several decades different types of
broad-line (type 1) AGN, from a Seyfert 1, double-peaked line, radio loud and
radio quiet AGN, to a supermassive binary black hole candidate. Our analysis of
the properties of the broad line region (BLR) of these objects is based on the
variability of the broad emission lines. We hereby give a comparative review of
the variability properties of the broad emission lines and the BLR of seven
different type 1 AGNs, emphasizing some important results, such as the
variability rate, the BLR geometry, and the presence of the intrinsic Baldwin
effect. We are discussing the difference and similarity in the continuum and
emission line variability, focusing on what is the impact of our results to the
supermassive black hole mass determination from the BLR properties.Comment: Published in Frontiers in Astronomy and Space Scienc
Mass-imbalanced ionic Hubbard chain
A repulsive Hubbard model with both spin-asymmetric hopping (t↑≠t↓) and a staggered potential (of strength Δ) is studied in one dimension. The model is a compound of the mass-imbalanced (t↑≠t↓,Δ=0) and ionic (t↑=t↓,Δ>0) Hubbard models, and may be realized by cold atoms in engineered optical lattices. We use mostly mean-field theory to determine the phases and phase transitions in the ground state for a half-filled band (one particle per site). We find that a period-two modulation of the particle (or charge) density and an alternating spin density coexist for arbitrary Hubbard interaction strength, U≥0. The amplitude of the charge modulation is largest at U=0, decreases with increasing U and tends to zero for U→∞. The amplitude for spin alternation increases with U and tends to saturation for U→∞. Charge order dominates below a value Uc, whereas magnetic order dominates above. The mean-field Hamiltonian has two gap parameters, Δ↑ and Δ↓, which have to be determined self-consistently. For UUc they have different signs, and for U=Uc one gap parameter jumps from a positive to a negative value. The weakly first-order phase transition at Uc can be interpreted in terms of an avoided criticality (or metallicity). The system is reluctant to restore a symmetry that has been broken explicitly
Measurement uncertainty in broadband radiofrequency radiation level measurements
For the evaluation of measurement uncertainty in the measurement of broadband
radio frequency radiation, in this paper we propose a new approach based on
the experience of the authors of the paper with measurements of
radiofrequency electric field levels conducted in residential areas of
Belgrade and over 35 municipalities in Serbia. The main objective of the
paper is to present practical solutions in the evaluation of broadband
measurement uncertainty for the in-situ RF radiation levels. [Projekat
Ministarstva nauke Republike Srbije, br. III43009
Parallel window decoding enables scalable fault tolerant quantum computation
Quantum Error Correction (QEC) continuously generates a stream of syndrome
data that contains information about the errors in the system. Useful
fault-tolerant quantum computation requires online decoders that are capable of
processing this syndrome data at the rate it is received. Otherwise, a data
backlog is created that grows exponentially with the -gate depth of the
computation. Superconducting quantum devices can perform QEC rounds in sub-1
s time, setting a stringent requirement on the speed of the decoders. All
current decoder proposals have a maximum code size beyond which the processing
of syndromes becomes too slow to keep up with the data acquisition, thereby
making the fault-tolerant computation not scalable. Here, we will present a
methodology that parallelizes the decoding problem and achieves almost
arbitrary syndrome processing speed. Our parallelization requires some
classical feedback decisions to be delayed, leading to a slow-down of the
logical clock speed. However, the slow-down is now polynomial in code size and
so an exponential backlog is averted. Furthermore, using known
auto-teleportation gadgets the slow-down can be eliminated altogether in
exchange for increased qubit overhead, all polynomially scaling. We demonstrate
our parallelization speed-up using a Python implementation, combining it with
both union-find and minimum weight perfect matching. Furthermore, we show that
the algorithm imposes no noticeable reduction in logical fidelity compared to
the original global decoder. Finally, we discuss how the same methodology can
be implemented in online hardware decoders.Comment: 12 pages, 7 figure
Delphi with feedback of rationales: how large can a Delphi group be such that participants are not overloaded, de-motivated, or disengaged?
In this paper, we investigate the effect of Delphi group size and opinion diversity on group members’ information load as well as on their overall experience of the Delphi process - in terms of task involvement (enjoyment and interest) and in terms of group sway (the influence and helpfulness of others’ rationales). For Delphi applications involving the exchange of rationales between participants, we found no evidence that group sizes of up to 19 participants cause information overload or de-motivation and disengagement of participants
Treatment compliance and retention in care among out-patient clients in a tertiary health institution in plateau state North Central Nigeria
Background: Compliance with prescribed treatment and retention in care are key components in the management of chronic diseases which is vital in averting the long term complications that could arise from such conditions. Failure to comply with treatment recommendations is often associated with poor retention in care. In view of this, this study was conducted to determine the level of treatment compliance and retention in care among patients with hypertension and diabetes in Jos University Teaching Hospital.Methods: This was a cross sectional study conducted among 290 eligible respondents between September and November 2017 using quantitative method of data collection. SPSS version 20 was used for data analysis with adjusted odds ratio and 95% confidence interval used as point and interval estimates while p-value of ≤0.05 was considered statistically significant.Results: The mean age of the respondents was 54.5±13.1 years with 43.8% of the respondents found to have satisfactorily complied with prescribed treatment while 117 (40.3%) were uninterruptedly retained in care within the last 6 months' clinic appointments prior to the study.Conclusions: This study has demonstrated the levels of compliance with treatment and retention in care bringing to bear the need to provide structured interventions targeted at attaining improvement in compliance with treatment and retention in care among individuals on long term care
Android Based Smart Home System
Conventional electrical installations used in various
building today poses great difficulty for physically challenged and
elderly persons to operate them. Sometimes it is also inconvenient
for normal person to use productively. Because of the increasing
number of both the elderly and the disabled persons, an
implementation of a smart home system is proposed in this paper.
In addition to the convenience, the system also provides a platform
for inclusion of the elderly and physically challenged individuals in
both homes and offices, thereby enabling them to contribute
meaningful to the development of the economy. The system gives
home users wireless control over the house hold lighting systems,
ventilation systems and the home main gate using an application
running on an android smart phone. It also provides the user with
an up to date temperature reading of the surrounding and the
energy consumed by the device in the house. A centralized
controller was developed around PIC 18F4550 microcontroller to
handle the data acquisition and processing for the system. The
overall system performance was demonstrated in controlling lamps,
fans and gate of a prototyped one bedroom flat and confirmed the
success of the design
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