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  • Astronomy  (7)
  • J24
  • 2010-2014  (11)
  • 1
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    Brussels: Economics and Econometrics Research Institute (EERI)
    Publication Date: 2018-01-19
    Description: This paper examines the potential impacts of East-West migration of talents on the innovative capital and hence the long-run growth prospects in Eastern sending countries. Complementing previous studies, we examine the impact of high skill migration not only on the formation of human capital, but also consider migration's impact on knowledge capital in the sending countries. In line with previous studies we find that in the short- to medium-term high skill migration strictly reduces national innovative capital and hence increases the gap between East and West. However, these effects might be mitigated by factors such as reinforced education of workers, productive investment of remittances, return migration and increased knowledge transfer. Given that the emigration of highly skilled affects human capital differently than knowledge capital, addressing the adverse impacts of the most talented and highly skilled worker emigration efficiently, differentiated policies are required for human capital and knowledge capital.
    Keywords: D50 ; D80 ; F22 ; F24 ; H52 ; I21 ; J24 ; J61 ; O15 ; ddc:330 ; International labour migration ; skilled workers ; growth ; human capital
    Repository Name: EconStor: OA server of the German National Library of Economics - Leibniz Information Centre for Economics
    Language: English
    Type: doc-type:workingPaper
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  • 2
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    Brussels: Economics and Econometrics Research Institute (EERI)
    Publication Date: 2018-01-19
    Description: In 2009 the EU adopted a new migration policy instrument - the Blue Cards (BC) - for attracting highly skilled workers to the EU. The present paper examines the potential impacts, which BC may cause on the less developed sending countries (LDC). According to the adopted framework of innovative capital, the BC will reduce human capital in LDC. In addition, BC will also have a negative impact on knowledge capital. These findings suggest that the BC is not coherent with the EU’s development policy. Without appropriate policy responses, BC fade the developing country growth prospects away. In order to address the skill drain issues, we propose and examine alternative migration policy options for the LDC.
    Keywords: F02 ; F22 ; J24 ; J61 ; O15 ; ddc:330 ; African sending countries ; high-skill migration ; EU Blue Cards ; innovative capital ; economic growth ; LDC
    Repository Name: EconStor: OA server of the German National Library of Economics - Leibniz Information Centre for Economics
    Language: English
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  • 3
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    Brussels: Economics and Econometrics Research Institute (EERI)
    Publication Date: 2018-01-19
    Description: Recently, the EU Council adopted a new labour migration policy instrument - the EU Blue Cards (BC) - for attracting the highly skilled workers to the EU. The present paper examines the potential impacts, which BC may cause on less developed sending countries (LDC). Our results suggest that the EU BC will reduce human capital in LDC. In addition, BC will also have a negative impact on knowledge capital. These findings suggest that without appropriate policy responses, BC makes developing country growth prospects rather bleak than blue. Therefore, we propose and analyse alternative migration policy instruments for LDC. We find that policies implemented on the demand side of the skilled labour market are the most efficient. In contrast, policies that address the supply side of the skilled labour market are the least efficient, though they might be less costly to implement.
    Keywords: F02 ; F22 ; J24 ; J61 ; O15 ; ddc:330 ; Knowledge capital ; human capital ; high-skill migration ; innovative capital ; economic growth
    Repository Name: EconStor: OA server of the German National Library of Economics - Leibniz Information Centre for Economics
    Language: English
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  • 4
    Publication Date: 2018-06-28
    Description: In this paper we analyze the impact of immigrants on the type and quantity of native jobs. We use data on fifteen Western European countries during the 1996-2010 period. We find that immigrants, by taking manual-routine type of occupations pushed natives towards more complex (abstract and communication) jobs. Such positive reallocation occurred while the total number of jobs held by natives was unaffected. This job upgrade was associated in the short run to a 0.6% increase in native wages for a doubling of the immigrants' share. These results are robust to the use of two alternative IV strategies based on past settlement of immigrants across European countries measured alternatively with Census or Labor Force data. The job upgrade slowed, but did not come to a halt, during the Great Recession. We also document the labor market flows behind it: the complexity of jobs offered to new native hires was higher relative to the complexity of lost jobs. Finally, we find evidence that such reallocation was significantly larger in countries with more flexible labor laws and that his tendency was particularly strong for less educated workers.
    Keywords: J24 ; J31 ; J61 ; ddc:330 ; Immigration ; Jobs ; Task specialization ; Employment Protection Laws ; Europe
    Repository Name: EconStor: OA server of the German National Library of Economics - Leibniz Information Centre for Economics
    Language: English
    Type: doc-type:workingPaper
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  • 5
    Publication Date: 2019-07-19
    Description: We present calculations of the early stages of the formation of Jupiter via core nucleated accretion and gas capture. The core begins as a seed body of about 350 kilometers in radius and orbits in a swarm of planetesimals whose initial radii range from 15 meters to 100 kilometers. We follow the evolution of the swarm by accounting for growth and fragmentation, viscous and gravitational stirring, and for drag-induced migration and velocity damping. Gas capture by the core substantially enhances the cross-section of the planet for accretion of small planetesimals. The dust opacity within the atmosphere surrounding the planetary core is computed self-consistently, accounting for coagulation and sedimentation of dust particles released in the envelope as passing planetesimals are ablated. The calculation is carried out at an orbital semi-major axis of 5.2 AU and an initial solids' surface density of 10/g/cm^2 at that distance. The results give a core mass of 7 Earth masses and an envelope mass of approximately 0.1 Earth mass after 500,000 years, at which point the envelope growth rate surpasses that of the core. The same calculation without the envelope gives a core mass of only 4 Earth masses.
    Keywords: Astronomy
    Type: ARC-E-DAA-TN10762 , NCTS# 16972-14; Annual Meeting, Division for Planetary Science; Oct 06, 2013 - Oct 11, 2013; Denver, CO; United States
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  • 6
    Publication Date: 2019-07-13
    Description: No abstract available
    Keywords: Astronomy
    Type: National Radio Science Meeting (USNC-URSI); Jan 05, 2011 - Jan 09, 2011; Boulder, CO; United States
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  • 7
    Publication Date: 2019-07-13
    Description: The architecture of a cross-correlator for a synthesis radio telescope with N greater than 1000 antennas is studied with the objective of minimizing power consumption. It is found that the optimum architecture minimizes memory operations, and this implies preference for a matrix structure over a pipeline structure and avoiding the use of memory banks as accumulation registers when sharing multiply-accumulators among baselines. A straw-man design for N = 2000 and bandwidth of 1 GHz, based on ASICs fabricated in a 90 nm CMOS process, is presented. The cross-correlator proper (excluding per-antenna processing) is estimated to consume less than 35 kW.
    Keywords: Astronomy
    Type: 2011 URSI General Assembly and Scientific Symposium; Aug 13, 2011 - Aug 20, 2011; Istanbul; Turkey
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  • 8
    Publication Date: 2019-07-13
    Description: No abstract available
    Keywords: Astronomy
    Type: LWA Current and Future Users Meeting; May 12, 2011 - May 13, 2011; Albuquerque, NM; United States
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  • 9
    Publication Date: 2019-07-13
    Description: We report on multifrequency observations performed during 2012 December-2013 August of the first narrow-line Seyfert 1 galaxy detected in gamma rays, PMN J0948+0022 (z equal to 0.5846). A gamma-ray flare was observed by the Large Area Telescope on board Fermi during 2012 December-2013 January, reaching a daily peak flux in the 0.1-100 GeV energy range of (155 plus or minus 31)10(exp 8) ph cm (exp 2) s (exp 1) on 2013 January 1, corresponding to an apparent isotropic luminosity of approximately 1.510)exp 48) erg s(exp 1). The gamma-ray flaring period triggered Swift and VERITAS observations in addition to radio and optical monitoring by OVRO, MOJAVE, and CRTS. A strong flare was observed in optical, UV, and X- rays on 2012 December 30, quasi-simultaneously to the gamma-ray flare, reaching a record flux for this source from optical to gamma rays. VERITAS observations at very high energy (E greater than 100 GeV) during 2013 January 6-17 resulted in an upper limit of F(sub greater than 0.2 TeV) less than 4.0 10(exp 12) ph cm(exp 2) s(exp 1). We compared the spectral energy distribution (SED) of the flaring state in 2013 January with that of an intermediate state observed in 2011. The two SEDs, modelled as synchrotron emission and an external Compton scattering of seed photons from a dust torus, can be modelled by changing both the electron distribution parameters and the magnetic field.
    Keywords: Astronomy
    Type: GSFC-E-DAA-TN24339 , Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711) (e-ISSN 1365-2966); 446; 3; 2456-2467
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  • 10
    Publication Date: 2019-07-13
    Description: Motivation for the study is: (1) Lunar Radio Array for low frequency, high redshift Dark Ages/Epoch of Reionization observations (z =6-50, f=30-200 MHz) (2) High precision cosmological measurements of 21 cm H I line fluctuations (3) Probe universe before first star formation and provide information about the Intergalactic Medium and evolution of large scale structures (5) Does the current cosmological model accurately describe the Universe before reionization? Lunar Radio Array is for (1) Radio interferometer based on the far side of the moon (1a) Necessary for precision measurements, (1b) Shielding from earth-based and solar RFI (12) No permanent ionosphere, (2) Minimum collecting area of approximately 1 square km and brightness sensitivity 10 mK (3)Several technologies must be developed before deployment The power needed to process signals from a large array of nonsteerable elements is not prohibitive, even for the Moon, and even in current technology. Two different concepts have been proposed: (1) Dark Ages Radio Interferometer (DALI) (2)( Lunar Array for Radio Cosmology (LARC)
    Keywords: Astronomy
    Type: National Radio Science Meeting; Jan 05, 2011; Boulder, CO; United States
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