1,151 research outputs found

    Risk and Economic Growth

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    In the expectation of the EU integration, the improvement of the economic growth on medium term constitutes a national strategic objective. The achievement of a compatible economy regarding to the mechanism, structure and legislative with the EU countries economies allows for a multitude of actions and measures that must be realized, inclusive the evolution until certain levels of some synthetic economic indicators that characterizes economic growth. This paper presents the evolution of the economic growth indicators in period 1990 – 2004 as well as the evolution of the factors that contributes to economic growth.economic growth, risk, macroeconomic indicators, multi-criteria analysis

    A large narrow band Hα\alpha survey at z0.2z\sim0.2: the bright end of the luminosity function, cosmic variance and clustering across cosmic time

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    We carried out the largest (>3.5×105>3.5\times10^5 Mpc3^3, 26 deg2^2) Hα\alpha narrow band survey to date at z0.2z\sim0.2 in the SA22, W2 and XMMLSS extragalactic fields. Our survey covers a large enough volume to overcome cosmic variance and to sample bright and rare Hα\alpha emitters up to an observed luminosity of 1042.4\sim10^{42.4} erg s1^{-1}, equivalent to 11M\sim11 M_\odot yr1^{-1}. Using our sample of 220220 sources brighter than >1041.4>10^{41.4} erg s1^{-1} (>1M>1 M_\odot yr1^{-1}), we derive Hα\alpha luminosity functions, which are well described by a Schechter function with ϕ=102.85±0.03\phi^* = 10^{-2.85\pm0.03} Mpc3^{-3} and LHα=1041.71±0.02L^*_{H\alpha} = 10^{41.71\pm0.02} erg s1^{-1} (with a fixed faint end slope α=1.35\alpha=-1.35). We find that surveys probing smaller volumes (3×104\sim3\times10^4 Mpc3^3) are heavily affected by cosmic variance, which can lead to errors of over 100100 per cent in the characteristic density and luminosity of the Hα\alpha luminosity function. We derive a star formation rate density of ρSFRD=0.0094±0.0008\rho_\mathrm{SFRD} = 0.0094\pm0.0008 MM_\odot yr1^{-1}, in agreement with the redshift-dependent Hα\alpha parametrisation from Sobral et al. (2013). The two-point correlation function is described by a single power law ω(θ)=(0.159±0.012)θ(0.75±0.05)\omega(\theta) = (0.159\pm0.012) \theta^{(-0.75\pm0.05)}, corresponding to a clustering length of r0=3.3±0.8r_0 = 3.3\pm0.8 Mpc/h. We find that the most luminous Hα\alpha emitters at z0.2z\sim0.2 are more strongly clustered than the relatively fainter ones. The LHαL^*_{H\alpha} Hα\alpha emitters at z0.2z\sim0.2 in our sample reside in 1012.513.5\sim10^{12.5-13.5} MM_\odot dark matter haloes. This implies that the most star forming galaxies always reside in relatively massive haloes or group-like environments and that the typical host halo mass of star-forming galaxies is independent of redshift if scaled by LHα/LHα(z)L_\mathrm{H\alpha}/L^*_{H\alpha}(z), as proposed by Sobral et al. (2010).Comment: Accepted for publication in MNRAS; 18 pages, 19 figures, 6 table

    Unveiling the cause of hybrid morphology radio sources (HyMoRS)

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    19 pages, 4 figures, 6 tables. Accepted for publication in MNRASHybrid morphology radio sources (HyMoRS) are a rare group of radio galaxies in which differing Fanaroff & Riley morphologies (FR I/II) are observed for each of the two lobes. While they potentially provide insights into the formation of lobe structure, particle acceleration, and the FR dichotomy, previous work on HyMoRS has mainly been limited to low-resolution studies, searches for new candidates, and milliarcsecond-scale VLBI observations of the core region. In this paper, we use new multi-array configuration Very Large Array (VLA) observations between 1 and 8 GHz to determine the morphology of HyMoRS on arcsecond scales and perform the first well-resolved spectral study of these unusual sources. We find that while the apparent FR I lobe is centre-brightened, this is the result of a compact acceleration region resembling a hotspot with a spectrum more consistent with an FR II ("strong-flavour") jet. We find that the spectra of the apparent FR I lobes are not similar to their classical counterparts and are likely the result of line-of-sight mixing of plasma across a range of spectral ages. We consider possible mechanisms that could lead to the formation of HyMoRS under such conditions, including environment asymmetry and restarted sources, concluding through the use of simple modelling that HyMoRS are the result of orientation effects on intrinsically FR II sources with lobes non-parallel to the inner jet.Peer reviewedFinal Accepted Versio

    Valve vs. solid-state microphone preamplifier: a comparative study

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    This paper outlines research carried out to determine the perceptual and objective differences between a solid-state and a valve preamplifier running at low voltages. ABX testing was employed and showed that there were perceivable differences between the two systems. A comprehensive objective analysis was performed, which utilised tests for total harmonic distortion + noise (THD+N), intermodulation distortion (IMD), THD versus frequency and frequency response in order to ensure the two systems were performing in their linear region. In addition, MIRToolbox was utilised to extract low-level features such as spectral centroid, skewness and novelty. The electronic measurements combined with the MIRToolbox support the listeners’ subjective descriptors that there is a difference in brightness and harmonic content between the two types of preamplifiers. A correlation theory was developed, which linked the objective and the subjective measurements


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    The present study attempts to make a diagnosis of the progress of European Union member states in the transition towards the knowledge economy. We used the World Bank KAM Methodology developed in the programme Knowledge for Development and the database available on the web page of the World Bank. KAM Methodology was described and the European progress towards the knowledge economy was assessed according to this methodology, with the focus on the Romanian situation, from a comparative perspective.knowledge economy; competitiveness through knowledge

    Insurances and Consumer Perception in the Romanian Insurance Market

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    AbstractConsumer behavior remains a debated area in the economic fields duet o its particularities that are connected to the way information is presented or to the characteristics of the market. Insurance market is a different market that impose a different perception and various factors that influence the insurance acquistion. Uncertainty can be considered a key element of selling insurance, for the event which is the subject of the insurance contract may occur or not an event is possible, and uncertain future. The need for security is also an uncertain factors influencing this decision entailing particular due to the intangibility and lack of transparency. Also Romanian clients have different particularities due to the fact that their income are low and concentrate only on necessary goods. The impact of the crisis still has repercussions on the perception of the Romanian buyer

    Consumption For The Fulfillment Of Human Life

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    The present moment is characterized by the syntagm of „hiperconsumption society”, as we assist to an unprecedented augmentation of our desires to consume, associated with a fundamental change of values. The study analyzes, based on the vast scientific literature, the causes and the effects of this hypertrophy of consumption, based on the assumption of Oswald „Economic performance is not intrinsically interesting... Economic things matter only in so far as they make people happier.” Also, as a new paradigm on economic development is being outlined in the economic science, using „health of the living” as a fundamental value, understood as an ensemble of parameters that create the frame for what must be a normal and desired evolution, we analyzed the means that are available and can be used for the transition towards a healthy model of consumption. From the perspective of consumers’ protection, we consider that education for a healthy consumption is an appropriate answer that can generate a durable change of the present pattern towards a more generous consumption from an intergenerational point of view that can also sustain a high quality of life for the generations that coexists and succeed themselves.healthy consumption, consumer⁳ education, the right to education, underconsumption and hyperconsumption, paradox of happiness, imperatives of human life

    A stringent upper limit to 18cm radio emission from the extrasolar planet system tau Bootis

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    Context: It has been speculated for many years that some extrasolar planets may emit strong cyclotron emission at low radio frequencies in the range 10-100 MHz. Despite several attempts no such emission has yet been seen. Aims: The hot Jupiter system tau Bootis is one of the nearest (d=15 pc) exoplanets known to date. The gravitational influence of this massive hot Jupiter (M=6 M_jup) has locked the star-planet system, making the star rotate in P~3.3 days, similar to the orbital period of the planet. From the well established correlation between stellar rotation and radio luminosity, it is conceivable that the tau Bootis system emits strong radio emission at significantly higher frequencies than currently probed, which we aimed to investigate with this work. Methods: We observed tau Bootis with the Westerbork Synthesis Radio Telescope (WSRT) at a frequency of 1.7 GHz. for 12 hours in spectral line mode, reaching a noise level of 42 microJy/beam at the position of the target. Results: No 18cm radio emission is detected from tau Bootis, resulting in a 3 sigma upper limit of 0.13 mJy, corresponding to a 18cm radio luminosity of <3.7e13 erg/s/Hz. We observe tau Bootis to be two orders of magnitude fainter than expected from the stellar relation between radio luminosity and rotation velocity. Conclusions: This implies that either the tau Bootis system is underluminous in the radio compared to similar fast-rotating stars, or that we happened to observe the target during a low state of radio emission.Comment: 4 pages, 1 figure: Accepted for publication in A&

    Analysis of Performance and Degradation for Lithium Titanate Oxide Batteries

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