Search results for "INDEX"
showing 10 items of 5395 documents
Nonlinear beam self-cleaning in a coupled cavity composite laser based on multimode fiber
2017
International audience; We study a coupled cavity laser configuration where a passively Q-switched Nd:YAG microchip laser is combined with an extended cavity, including a doped multimode fiber. For appropriate coupling levels with the extended cavity, we observed that beam self-cleaning was induced in the multimode fiber thanks to nonlinear modal coupling, leading to a quasi-single mode laser output. In the regime of beam self-cleaning, laser pulse duration was reduced from 525 to 225 ps. We also observed a Q-switched mode-locked operation, where spatial self-cleaning was accompanied by far-detuned nonlinear frequency conversion in the active multimode fiber.
Le Climosequenze: strumenti per valutare gli effetti dei cambiamenti climatici su alcune proprietà e caratteri funzionali del suolo - un caso studio …
2013
Upper limits on the isotropic gravitational-wave background from Advanced LIGO and Advanced Virgo's third observing run
2021
We report results of a search for an isotropic gravitational-wave background (GWB) using data from Advanced LIGO's and Advanced Virgo's third observing run (O3) combined with upper limits from the earlier O1 and O2 runs. Unlike in previous observing runs in the advanced detector era, we include Virgo in the search for the GWB. The results are consistent with uncorrelated noise, and therefore we place upper limits on the strength of the GWB. We find that the dimensionless energy density $\Omega_{\rm GW}\leq 5.8\times 10^{-9}$ at the 95% credible level for a flat (frequency-independent) GWB, using a prior which is uniform in the log of the strength of the GWB, with 99% of the sensitivity comi…
Correlation between Cognition and Balance among Middle-Aged and Older Adults Observed through a Tai Chi Intervention program
2020
Background: Age-associated decline in cognition and balance may cause severe ability loss for daily living activities among middle-aged and older adults. The relationship between cognition and balance in this aging population remains to be explored. Objective: The present study Is exploratory in nature and aimed to examine the relationship between balance (both static and dynamic components) and global cognitive function among middle-aged and older adults through Tai Chi (TC) practice as a research avenue. Methods: A short-term (12 weeks) intervention of TC was conducted among middle-aged and older adults in the community setting. Global cognitive function (using the Chinese version of the …
Impact of various factors on the diversity of soil microorganisms in agricultural and forest soils
2014
Elektroniskā versija nesatur pielikumus
Burden of Comorbidities in Patients with OSAS and COPD-OSAS Overlap Syndrome
2021
Background and Objectives: Obstructive sleep apnea syndrome (OSAS) and chronic obstructive pulmonary disease (COPD) are usually associated with multi-morbidity. The aim of this study was to retrospectively investigate the prevalence of comorbidities in a cohort of patients with OSAS and COPD-OSAS overlap syndrome (OS) patients and to explore differences between these two groups. Materials and Methods: Included were consecutive OS patients and OSAS patients who had been referred to our sleep laboratory, and were matched in terms of sex, age, BMI, and smoking history. Presence of comorbidities was recorded based on their medical history and after clinical and laboratory examination. Results: …
PATTERNS OF COMPARATIVE ADVANTAGES AND THEIR CHANGE FOR THE WINE INDUSTRY IN THE INTERNATIONAL SCENARIO
2015
The aim of this study is to analyse the specialization patterns of the main wine world actors, consumers and traders, so as to verify whether or not the patterns of comparative advantages for the trade of this countries have experienced significant changes over the period 2003-2012. The analysis carried out through the estimating of Lafay index reveals deep changes in the global wine market. In particular Italy, France, and Spain, though keeping an unquestioned importance in the international scenario, are experiencing a progressive loss of competitiveness. Differently, new countries have reinforced their presence in the international market, and among them Chile for the bottled wines, and …
A die-hard aristocracy: competitive balance in Italian soccer, 1929-2009
2010
We will present two measures of the competitive balance in professional Italian soccer, one based on the a club's historical rankings and one based on points scored per season. We will calculate and illustrate their characteristics for the Italian first division (the Serie A) between 1929 and 2009. Using the cumulated rankings of the 60 clubs which have taken part in the Serie A we show that Italian soccer is strongly characterized by a self-reinforcing mechanism of dominance that has created an aristocracy of at most ten strong clubs. We also show that increasing the number of promoted clubs could have an innovative impact. Our results imply that each season is fiercely fought, and this le…
Pesquisa científica em contabilidade gerencial: estudo comparativo entre Espanha e Brasil
2012
Nas últimas décadas a contabilidade gerencial teve um desenvolvimento acentuado, com inclusão de novos temas e métodos de investigação, revistas exclusivas, e principalmente estudos com perspectivas multidisciplinares. Uma das formas de perceber e entender esse nível de desenvolvimento é estudar suas publicações nas principais revistas. Assim, o objetivo é realizar um estudo comparativo sobre contabilidade gerencial entre a Espanha e o Brasil. Para tanto, foram selecionados 421 artigos de sete revistas espanholas de contabilidade listadas no IN-RECS (Índice de Impacto das Revistas Espanholas de Ciências Sociais), e 245 artigos de seis revistas brasileiras listadas na Capes. Por tanto, anali…
A TOPOLOGICAL STUDY OF PLANAR VECTOR FIELD SINGULARITIES A tribute to Ivar Bendixson
2019
In this paper one extends results of Bendixson [B] and Dumortier [D] about the germs of vector fields with an isolated singularity at the origin of IR 2 , not accumulated by periodic orbits. As new tool, one introduces minimal curves, which are curves surrounding the origin, with a minimal number of contact points with the vector field. Moreover, the arguments are essentially topological, with no use of a desingularization theory, as it is the case in [D]. 2000 Mathematics Subject Classification : 34C05, 34A26.