Results 1 to 10 of about 8,113,379 (294)

Experimental demonstration of singular-optical colouring of regularly scattered white light [PDF]

open access: yesJournal of the European Optical Society-Rapid Publications, 2008
Experimental interference modelling of the effects of colouring of a beam traversing a light-scattering medium is presented. It is shown that the result of colouring of the beam at the output of the medium depends on the magnitudes of the phase delays of
Angelsky O. V.   +4 more
doaj   +1 more source

Correlation Optics, Coherence and Optical Singularities: Basic Concepts and Practical Applications

open access: yesFrontiers in Physics, 2022
The main idea of this review is to trace the interrelations and inter-transitions between the basic concepts and approaches of the correlation optics (including the light coherence) and the singular optics dealing with networks of “exceptional” points of
O. V. Angelsky   +6 more
doaj   +1 more source

CLASSIFYING OPTICAL PROPERTIES OF SURFACE- AND BULK-SCATTERING BIOLOGICAL LAYERS WITH POLARIZATION SINGULAR STATES [PDF]

open access: yesJournal of Innovative Optical Health Sciences, 2013
The results of singular approach usage in the tasks of description and classification of appearance of optical anisotropy of different types of phase-inhomogeneous biological layers (surface-scattering, optically thin and optically thick) have been ...
YU. A. USHENKO   +2 more
doaj   +1 more source

Harm reduction in Europe: a framework for civil society-led monitoring

open access: yesHarm Reduction Journal, 2021
Background Civil society organisations (CSOs) play a vital role in developing and implementing effective measures to reduce the harms of drug use. They are also fundamental actors to monitor and evaluate programmes and policies for improvement.
Rafaela Rigoni   +3 more
doaj   +1 more source

Kibble–Zurek scaling due to environment temperature quench in the transverse field Ising model

open access: yesScientific Reports, 2023
The Kibble–Zurek mechanism describes defect production due to non-adiabatic passage through a critical point. Here we study its variant from ramping the environment temperature to a critical point. We find that the defect density scales as $$\tau ^{-d\nu
Ádám Bácsi, Balázs Dóra
doaj   +1 more source

Diachronic Analysis of Word Frequency in the First Document of Chinese Party Central Committee Based on People's Daily Corpus [PDF]

open access: yesNongye tushu qingbao xuebao, 2020
[Purpose/Significance] The aim of this study is to reveal the characteristics of our times of important words in the No. 1 Central Document, the first document issued by the Central Committee of the Communist Party of China every year.
HUANG Shuiqing, Wang Dongbo
doaj   +1 more source

High-Speed Tracking with Kernelized Correlation Filters [PDF]

open access: yesIEEE Transactions on Pattern Analysis and Machine Intelligence, 2014
The core component of most modern trackers is a discriminative classifier, tasked with distinguishing between the target and the surrounding environment.
João F. Henriques   +3 more
semanticscholar   +1 more source

The advantages of the Matthews correlation coefficient (MCC) over F1 score and accuracy in binary classification evaluation

open access: yesBMC Genomics, 2020
To evaluate binary classifications and their confusion matrices, scientific researchers can employ several statistical rates, accordingly to the goal of the experiment they are investigating.
D. Chicco, Giuseppe Jurman
semanticscholar   +1 more source

Different phases of ATS use call for different interventions: a large qualitative study in Europe

open access: yesHarm Reduction Journal, 2022
Background Amphetamine-type stimulants (ATS) are globally widely used. Scientific literature generally defines four phases of substance use (initiation, continuation, increase and decrease); however, there is limited understanding of what influences ...
Nienke Liebregts   +6 more
doaj   +1 more source

Civil society involvement in harm reduction drug policy: reflections on the past, expectations for the future

open access: yesHarm Reduction Journal, 2021
Background A range of civil society organisations (CSOs) such as drug user groups, non-governmental/third sector organisations and networks of existing organisations, seek to shape the development of drugs policy at national and international levels ...
Aileen O’Gorman, Eberhard Schatz
doaj   +1 more source

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