757 research outputs found
Density-clustering of continuous gravitational wave candidates from large surveys
Searches for continuous gravitational waves target nearly monochromaticgravitational wave emission from e.g. non-axysmmetric fast-spinning neutronstars. Broad surveys often require to explicitly search for a very large numberof different waveforms, easily exceeding templates. In suchcases, for practical reasons, only the top, say , results aresaved and followed-up through a hierarchy of stages. Most of these candidatesare not completely independent of neighbouring ones, but arise due to somecommon cause: a fluctuation, a signal or a disturbance. By judiciouslyclustering together candidates stemming from the same root cause, thesubsequent follow-ups become more effective. A number of clustering algorithmshave been employed in past searches based on iteratively finding symmetric andcompact over-densities around candidates with high detection statistic values.The new clustering method presented in this paper is a significant improvementover previous methods: it is agnostic about the shape of the over-densities, isvery efficient and it is effective: at a very high detection efficiency, it hasa noise rejection of , is capable of clustering two orders ofmagnitude more candidates than attainable before and, at fixed sensitivity itenables more than a factor of 30 faster follow-ups. We also demonstrate how tooptimally choose the clustering parameters.<br
Π‘ΠΎΡΠΈΠ°Π»ΡΠ½ΠΎ-ΡΠΈΠ»ΠΎΡΠΎΡΡΠΊΠΈΠΉ Π°Π½Π°Π»ΠΈΠ· ΠΏΡΠΎΡΠ΅ΡΡΠΎΠ² ΠΌΠΎΠ΄Π΅ΡΠ½ΠΈΠ·Π°ΡΠΈΠΈ Π² ΠΠΈΡΠ°ΠΉΡΠΊΠΎΠΉ ΠΠ°ΡΠΎΠ΄Π½ΠΎΠΉ Π Π΅ΡΠΏΡΠ±Π»ΠΈΠΊΠ΅
ΠΡΠΎΠ°Π½Π°Π»ΠΈΠ·ΠΈΡΠΎΠ²Π°Π½Ρ ΠΎΡΠ½ΠΎΠ²Π½ΡΠ΅ ΠΈΠ·ΠΌΠ΅Π½Π΅Π½ΠΈΡ, ΠΏΡΠΎΠΈΠ·ΠΎΡΠ΅Π΄ΡΠΈΠ΅ Π² ΠΎΠ±ΡΠ΅ΡΡΠ²Π΅, Π² ΠΏΠΎΠ»ΠΈΡΠΈΡΠ΅ΡΠΊΠΎΠΉ ΡΠΈΡΡΠ΅ΠΌΠ΅ ΠΠΈΡΠ°Ρ Π² ΡΠ²ΡΠ·ΠΈ Ρ Π½Π°ΡΠ°Π»ΠΎΠΌ ΡΠ΅ΡΠΎΡΠΌ ΠΈ ΠΌΠΎΠ΄Π΅ΡΠ½ΠΈΠ·Π°ΡΠΈΠΈ ΠΏΠΎΡΠ»Π΅ ΠΏΡΠΈΡ
ΠΎΠ΄Π° ΠΊ Π²Π»Π°ΡΡΠΈ ΠΡΠ½ Π‘ΡΠΎΠΏΠΈΠ½Π°. ΠΠ°Π½ Π°Π½Π°Π»ΠΈΠ· ΠΎΡΠ½ΠΎΠ²Π½ΡΡ
ΠΏΠΎΠ»ΠΎΠΆΠ΅Π½ΠΈΠΉ ΠΏΡΠΎΠ³ΡΠ°ΠΌΠΌΡ ΠΌΠΎΠ΄Π΅ΡΠ½ΠΈΠ·Π°ΡΠΈΠΈ, ΠΏΡΠ΅Π΄Π»ΠΎΠΆΠ΅Π½Π½ΠΎΠΉ ΡΡΠΊΠΎΠ²ΠΎΠ΄ΡΡΠ²ΠΎΠΌ ΠΠΠ . ΠΡΠ²Π΅ΡΠ΅Π½Ρ ΡΠ΅ΠΎΡΠ΅ΡΠΈΠΊΠΎ-ΠΌΠ΅ΡΠΎΠ΄ΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΠΏΡΠ΅Π΄ΠΏΠΎΡΡΠ»ΠΊΠΈ ΠΌΠΎΠ΄Π΅ΡΠ½ΠΈΠ·Π°ΡΠΈΠΈ ΠΠΠ . ΠΡΠ΄Π΅Π»Π΅Π½Ρ ΠΎΡΠ½ΠΎΠ²Π½ΡΠ΅ ΠΌΠΈΡΠΎΠ²ΠΎΠ·Π·ΡΠ΅Π½ΡΠ΅ΡΠΊΠΈΠ΅ ΠΈ ΠΌΠ΅ΡΠΎΠ΄ΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΡΠ»Π΅ΠΌΠ΅Π½ΡΡ ΡΠ΅ΠΎΡΠΈΠΈ ΡΠΎΡΠΈΠ°Π»ΠΈΠ·ΠΌΠ° Ρ ΠΊΠΈΡΠ°ΠΉΡΠΊΠΎΠΉ ΡΠΏΠ΅ΡΠΈΡΠΈΠΊΠΈ
Π Π°Π·ΡΠ°Π±ΠΎΡΠΊΠ° ΡΠΈΡΡΠ΅ΠΌΡ Π£Π€-ΠΎΡΠ²Π΅ΡΠ΅Π½ΠΈΡ Π΄Π»Ρ Π»ΡΠΌΠΈΠ½Π΅ΡΡΠ΅Π½ΡΠ½ΠΎΠ³ΠΎ ΠΌΠ΅ΡΠΎΠ΄Π° ΠΊΠ°ΠΏΠΈΠ»Π»ΡΡΠ½ΠΎΠ³ΠΎ ΠΊΠΎΠ½ΡΡΠΎΠ»Ρ
Π ΠΏΡΠΎΡΠ΅ΡΡΠ΅ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ ΠΏΡΠΎΠΈΠ·Π²ΠΎΠ΄ΠΈΠ»Π°ΡΡ ΡΠ°Π·ΡΠ°Π±ΠΎΡΠΊΠ° Π£Π€-ΠΎΠ±Π»ΡΡΠ°ΡΠ΅Π»Ρ Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ ΡΠΊΡΠΈΠ»Π°ΠΌΠΏΡ Π΄Π»Ρ Π»ΡΠΌΠΈΠ½Π΅ΡΡΠ΅Π½ΡΠ½ΠΎΠ³ΠΎ ΠΊΠ°ΠΏΠΈΠ»Π»ΡΡΠ½ΠΎΠ³ΠΎ ΠΊΠΎΠ½ΡΡΠΎΠ»Ρ Ρ ΡΠ΅Π»ΡΡ Π΄ΠΎΡΡΠΈΠΆΠ΅Π½ΠΈΡ ΠΎΠΏΡΠΈΠΌΠ°Π»ΡΠ½ΡΡ
ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΡΠΎΠ² ΡΠΎΠΎΡΠ²Π΅ΡΡΡΠ²ΡΡΡΠΈΡ
ΠΊΠΎΠ½ΠΊΡΠ΅ΡΠ½ΡΠΌ Π·Π°Π΄Π°ΡΠ°ΠΌ Π²
ΠΏΡΠΎΠ²Π΅Π΄Π΅Π½ΠΈΠΈ Π»ΡΠΌΠΈΠ½Π΅ΡΡΠ΅Π½ΡΠ½ΠΎΠ³ΠΎ ΠΌΠ΅ΡΠΎΠ΄Π° ΠΊΠΎΠ½ΡΡΠΎΠ»Ρ:
β ΠΈΠ·ΠΌΠ΅Π½Π΅Π½ΠΈΠ΅ Π΄Π»ΠΈΠ½Ρ Π²ΠΎΠ»Π½Ρ, ΠΏΡΡΠ΅ΠΌ ΠΏΠΎΠ΄Π±ΠΎΡΠ° ΠΎΠΏΡΠ΅Π΄Π΅Π»Π΅Π½Π½ΠΎΠΉ Π³Π°Π·ΠΎΠ²ΠΎΠΉ ΡΠΌΠ΅ΡΠΈ ΠΈ
ΡΡΠ»ΠΎΠ²ΠΈΠΉ, Π² ΠΊΠΎΡΠΎΡΡΡ
ΡΠ΅Π°Π»ΠΈΠ·ΡΠ΅ΡΡΡ ΡΠ»Π΅ΠΊΡΡΠΈΡΠ΅ΡΠΊΠΈΠΉ ΡΠ°Π·ΡΡΠ΄;
β ΡΠ²Π΅Π»ΠΈΡΠ΅Π½ΠΈΡ ΡΠ΅ΡΡΡΡΠ° ΡΠ°Π±ΠΎΡΡ;
β ΠΏΠΎΡΡΠ°ΡΠΈΠ²Π½ΠΎΡΡΡ, ΠΏΠΎΡΠΊΠΎΠ»ΡΠΊΡ ΡΠΊΡΠΈΠ»Π°ΠΌΠΏΠ° ΠΎΠ±Π»Π°Π΄Π°Π΅Ρ Π½Π΅Π±ΠΎΠ»ΡΡΠΈΠΌ Π²Π΅ΡΠΎΠΌ,
ΠΈΠΌΠ΅Π΅ΡΡΡ Π²ΠΎΠ·ΠΌΠΎΠΆΠ½ΠΎΡΡΡ ΠΌΠΎΠ΄Π΅ΡΠ½ΠΈΠ·Π°ΡΠΈΠΈ Π΅Π΅ Π΄ΠΎ ΠΏΠΎΡΡΠ°ΡΠΈΠ²Π½ΠΎΠΉ Π²Π΅ΡΡΠΈΠΈ, ΡΠ°Π±ΠΎΡΠ°ΡΡΠ΅ΠΉ ΠΎΡ
Π±Π°ΡΠ°ΡΠ΅ΠΈ;
β ΡΡΠ³ΠΎΠ½ΠΎΠΌΠΈΡΠ½ΠΎΡΡΡ β Π΄ΠΎΡΠ°Π±ΠΎΡΠΊΠ° ΠΊΠΎΡΠΏΡΡΠ° ΠΏΡΡΠ΅ΠΌ ΠΈΠ·ΠΌΠ΅Π½Π΅Π½ΠΈΡ Π³Π΅ΠΎΠΌΠ΅ΡΡΠΈΠΈ
ΠΊΠΎΡΠΏΡΡΠ° ΠΈ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»ΠΎΠ², Π° ΡΠ°ΠΊΠΆΠ΅ ΡΠ°Π·ΡΠ°Π±ΠΎΡΠΊΠ° ΠΊΡΠ΅ΠΏΠ»Π΅Π½ΠΈΡ ΠΈ ΡΠΎΡΠΌΡ ΡΡΡΠΊΠΈ Π΄Π»Ρ Π»Π΅Π³ΠΊΠΎΠΉ
ΡΠΊΡΠΏΠ»ΡΠ°ΡΠ°ΡΠΈΠΈ.The object of the study is a portable exciplex barrier-discharge lamp (XeCl).
The aim of this work is to develop a UV exciter based on an exclamp for the luminescence method of capillary control.
In the process of research, the effective development of a UV irradiator based on an exclamp for luminescent capillary monitoring in order to achieve the optimum parameters of the corresponding task in conducting luminescence method of capillary control:
- change in the wavelength, under the selection of a specific gas mixture and the conditions in which an electric discharge is realized;
- increase in the resource of work;
- Portability, because the excilamp has a small weight, it is possible to upgrade it to a portable version powered by a battery
ΠΠΎΠ΄Π΅Π»ΠΈΡΠΎΠ²Π°Π½ΠΈΠ΅ ΡΡΠΈΠ»ΠΈΡΠ΅Π»Ρ ΡΡΠΊΠΎΡΡΠΈ Π² ΡΠ΅ΠΆΠΈΠΌΠ΅ ΠΏΠΎΠ½ΠΈΠΆΠ΅Π½Π½ΠΎΠ³ΠΎ ΡΠ½Π΅ΡΠ³ΠΎΠ²ΠΊΠ»Π°Π΄Π° Π² ΡΠ°Π·ΡΡΠ΄
ΠΠ°Π½Π½Π°Ρ ΡΠ°Π±ΠΎΡΠ° ΠΏΠΎΡΠ²ΡΡΠ΅Π½Π° ΡΠ°Π·ΡΠ°Π±ΠΎΡΠΊΠ΅ ΠΌΠ°ΡΠ΅ΠΌΠ°ΡΠΈΡΠ΅ΡΠΊΠΎΠΉ ΠΏΡΠΎΡΡΡΠ°Π½ΡΡΠ²Π΅Π½Π½ΠΎ-Π²ΡΠ΅ΠΌΠ΅Π½Π½ΠΎΠΉ ΠΌΠΎΠ΄Π΅Π»ΠΈ ΡΡΠΈΠ»ΠΈΡΠ΅Π»Ρ ΡΡΠΊΠΎΡΡΠΈ Π½Π° ΠΏΠ°ΡΠ°Ρ
ΠΌΠ΅Π΄ΠΈ. Π Π°Π±ΠΎΡΠ° ΡΠΎΡΡΠΎΠΈΡ ΠΈΠ· ΠΏΠΎΠ΄ΡΠΎΠ±Π½ΠΎΠ³ΠΎ ΠΎΠΏΠΈΡΠ°Π½ΠΈΡ ΠΌΠΎΠ΄Π΅Π»ΠΈ, ΡΠ΅ΡΡΠΈΡΠΎΠ²Π°Π½ΠΈΡ, ΠΏΠΎΠ·Π²ΠΎΠ»ΡΡΡΠ΅Π³ΠΎ ΠΎΡΠ΅Π½ΠΈΡΡ Π°Π΄Π΅ΠΊΠ²Π°ΡΠ½ΠΎΡΡΡ ΠΌΠΎΠ΄Π΅Π»ΠΈ, ΠΈ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΠΎΠ² ΠΌΠΎΠ΄Π΅Π»ΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΡΡΠΈΠ»ΠΈΡΠ΅Π»Ρ ΡΡΠΊΠΎΡΡΠΈ Π΄Π»Ρ ΡΠ°Π·Π½ΡΡ
ΡΠ΅ΠΆΠΈΠΌΠΎΠ² ΡΠ°Π±ΠΎΡΡ. Π ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΠ΅ ΠΌΠΎΠ΄Π΅Π»ΠΈΡΠΎΠ²Π°Π½ΠΈΡ Π±ΡΠ»ΠΎ ΠΎΡΠ΅Π½Π΅Π½ΠΎ Π²Π»ΠΈΡΠ½ΠΈΠ΅ ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΡΠΎΠ² ΡΡ
Π΅ΠΌΡ Π½Π°ΠΊΠ°ΡΠΊΠΈ Π½Π° Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊΠΈ ΡΡΠΈΠ»ΠΈΡΠ΅Π»Ρ ΡΡΠΊΠΎΡΡΠΈ ΠΈ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½Π° ΠΏΡΠΎΡΡΡΠ°Π½ΡΡΠ²Π΅Π½Π½ΠΎ-Π²ΡΠ΅ΠΌΠ΅Π½Π½Π°Ρ ΡΡΡΡΠΊΡΡΡΠ° ΠΊΠΎΡΡΡΠΈΡΠΈΠ΅Π½ΡΠ° ΡΡΠΈΠ»Π΅Π½ΠΈΡ Π°ΠΊΡΠΈΠ²Π½ΠΎΠΉ ΡΡΠ΅Π΄Ρ.This paper covers the development of the mathematical spatio-temporal model of the copper vapor brightness amplifier. The paper consists of the detailed model description, the testing which allows to estimate the model adequacy, and the results of the brightness amplifier simulation for different operating modes. As a results of simulation, the effect of pumping circuit parameters on brightness amplifier characteristics was estimated and the spatio-temporal brightness amplifier active medium gain structure was studied
Magnetoresistance of a two-dimensional electron gas with spatially periodic lateral modulations: Exact consequences of Boltzmann's equation
On the basis of Boltzmann's equation, and including anisotropic scattering in
the collision operator, we investigate the effect of one-dimensional
superlattices on two-dimensional electron systems. In addition to superlattices
defined by static electric and magnetic fields, we consider mobility
superlattices describing a spatially modulated density of scattering centers.
We prove that magnetic and electric superlattices in -direction affect only
the resistivity component if the mobility is homogeneous, whereas a
mobility lattice in -direction in the absence of electric and magnetic
modulations affects only . Solving Boltzmann's equation numerically,
we calculate the positive magnetoresistance in weak magnetic fields and the
Weiss oscillations in stronger fields within a unified approach.Comment: submitted to PR
The gender perspective in climate change and global health
Background: Population health is a primary goal of sustainable development. United Nations international conferences like the Beijing Platform for Action have highlighted the key role of women in ensuring sustainable development. In the context of climate change, women are affected the most while they display knowledge and skills to orient themselves toward climate adaptation activities within their societies. Objective: To investigate how the gender perspective is addressed as an issue in research and policy-making concerning climate change and global health. Methods: A broad literature search was undertaken using the databases Pubmed and Web of Science to explore the terms ‘climate change,’ ‘health,’ ‘gender,’ and ‘policy.’ Climate change and health-related policy documents of the World Health Organization (WHO) and National Communications and National Adaptation Programs of Action reports submitted to the United Nations Framework Convention on Climate Change of selected countries were studied. Assessment guidelines to review these reports were developed from this study's viewpoint. Results: The database search results showed almost no articles when the four terms were searched together. The WHO documents lacked a gender perspective in their approach and future recommendations on climate policies. The reviewed UN reports were also neutral to gender perspective except one of the studied documents. Conclusion: Despite recognizing the differential effects of climate change on health of women and men as a consequence of complex social contexts and adaptive capacities, the study finds gender to be an underrepresented or non-existing variable both in research and studied policy documents in the field of climate change and health
Weak Localization and Integer Quantum Hall Effect in a Periodic Potential
We consider magnetotransport in a disordered two-dimensional electron gas in
the presence of a periodic modulation in one direction. Existing quasiclassical
and quantum approaches to this problem account for Weiss oscillations in the
resistivity tensor at moderate magnetic fields, as well as a strong
modulation-induced modification of the Shubnikov-de Haas oscillations at higher
magnetic fields. They do not account, however, for the operation at even higher
magnetic fields of the integer quantum Hall effect, for which quantum
interference processes are responsible. We then introduce a field-theory
approach, based on a nonlinear sigma model, which encompasses naturally both
the quasiclassical and quantum-mechanical approaches, as well as providing a
consistent means of extending them to include quantum interference corrections.
A perturbative renormalization-group analysis of the field theory shows how
weak localization corrections to the conductivity tensor may be described by a
modification of the usual one-parameter scaling, such as to accommodate the
anisotropy of the bare conductivity tensor. We also show how the two-parameter
scaling, conjectured as a model for the quantum Hall effect in unmodulated
systems, may be generalized similarly for the modulated system. Within this
model we illustrate the operation of the quantum Hall effect in modulated
systems for parameters that are realistic for current experiments.Comment: 15 pages, 4 figures, ReVTeX; revised version with condensed
introduction; two figures taken out; reference adde
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