4,623 research outputs found

    Task planning and control synthesis for robotic manipulation in space applications

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    Space-based robotic systems for diagnosis, repair and assembly of systems will require new techniques of planning and manipulation to accomplish these complex tasks. Results of work in assembly task representation, discrete task planning, and control synthesis which provide a design environment for flexible assembly systems in manufacturing applications, and which extend to planning of manipulatiuon operations in unstructured environments are summarized. Assembly planning is carried out using the AND/OR graph representation which encompasses all possible partial orders of operations and may be used to plan assembly sequences. Discrete task planning uses the configuration map which facilitates search over a space of discrete operations parameters in sequential operations in order to achieve required goals in the space of bounded configuration sets

    Vacuum Polarization for a Massless Spin-1/2 Field in the Global Monopole Spacetime at Nonzero Temperature

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    In this paper we present the effects produced by the temperature in the renormalized vacuum expectation value of the zero-zero component of the energy-momentum tensor associated with massless left-handed spinor field in the pointlike global monopole spacetime. In order to develop this calculation we had to obtain the Euclidean thermal Green function in this background. Because the expression obtained for the thermal energy density cannot be expressed in a closed form, its explicit dependence on the temperature is not completely evident. So, in order to obtain concrete information about its thermal behavior, we develop a numerical analysis of our result in the high-temperature limit for specific values of the parameter őĪ\alpha which codify the presence of the monopole.Comment: 22 pages, LaTex format, 5 figure

    Star formation in low density HI gas around the Elliptical Galaxy NGC2865

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    Interacting galaxies surrounded by HI tidal debris are ideal sites for the study of young clusters and tidal galaxy formation. The process that triggers star formation in the low-density environments outside galaxies is still an open question. New clusters and galaxies of tidal origin are expected to have high metallicities for their luminosities. Spectroscopy of such objects is, however, at the limit of what can be done with existing 8-10m class telescopes, which has prevented statistical studies of these objects. NGC2865 is an UV-bright merging elliptical galaxy with shells and extended HI tails. The regions observed in this work were previously detected using multi-slit imaging spectroscopy. We obtain new multislit spectroscopy of six young star-forming regions around NGC2865, to determine their redshifts and metallicities. The six emission-line regions are located 16-40 kpc from NGC2865 and they have similar redshifts. They have ages of ~10Myears and an average metallicity of 12+log(O/H) ~ 8.6, suggesting a tidal origin for the regions. It is noted that they coincide with an extended HI tail, which has projected density of NHI_{HI} < 1019^{19} cm‚ąí2^{-2}, and displays a low surface brightness counterpart. These regions may represent the youngest of the three populations of star clusters already identified in NGC2865. The high, nearly-solar, oxygen abundances found for the six regions in the vicinity of NGC2865 suggest that they were formed by pre-enriched material from the parent galaxy, from gas removed during the last major merger. Given the mass and the location of the HII regions, we can speculate that these young star-forming regions are potential precursors of globular clusters that will be part of the halo of NGC2865 in the future. Our result supports the use of the multi-slit imaging spectroscopy as a useful tool for finding nearly-formed stellar systems around galaxies.Comment: 7 pages, 2 figures accepted in A&

    A Multiwavelength Study on the Fate of Ionizing Radiation in Local Starbursts

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    The fate of ionizing radiation is vital for understanding cosmic ionization, energy budgets in the interstellar and intergalactic medium, and star formation rate indicators. The low observed escape fractions of ionizing radiation have not been adequately explained, and there is evidence that some starbursts have high escape fractions. We examine the spectral energy distributions of a sample of local star-forming galaxies, containing thirteen local starburst galaxies and ten of their ordinary star-forming counterparts, to determine if there exist significant differences in the fate of ionizing radiation in these galaxies. We find that the galaxy-to-galaxy variations in the SEDs is much larger than any systematic differences between starbursts and non-starbursts. For example, we find no significant differences in the total absorption of ionizing radiation by dust, traced by the 24um, 70um, and 160um MIPS bands of the Spitzer Space Telescope, although the dust in starburst galaxies appears to be hotter than that of non-starburst galaxies. We also observe no excess ultraviolet flux in the GALEX bands that could indicate a high escape fraction of ionizing photons in starburst galaxies. The small H-alpha fractions of the diffuse, warm ionized medium in starburst galaxies are apparently due to temporarily boosted H-alpha luminosity within the star-forming regions themselves, with an independent, constant WIM luminosity. This independence of the WIM and starburst luminosities contrasts with WIM behavior in non-starburst galaxies and underscores our poor understanding of radiation transfer in both ordinary and starburst galaxies.Comment: 10 pages, 8 figures, accepted to ApJ 10/11/1

    Electrostatic self-force in (2+1)-dimensional cosmological gravity

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    Point sources in (2+1)-dimensional gravity are conical singularities that modify the global curvature of the space giving rise to self-interaction effects on classical fields. In this work we study the electrostatic self-interaction of a point charge in the presence of point masses in (2+1)-dimensional gravity with a cosmological constant.Comment: 9 pages, Late

    Olympic ranking based on a zero sum gains DEA model.

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    It is usual to rank the participant countries in the Olympic Games in accordance with the number of medals they have won. An alternative ranking is suggested in this paper. This ranking is based on each country's ability to win medals in relation to its available resources. This is an efficiency that can be measured with the help of data envelopment analysis (DEA) for which two models exist: the traditional DEA model, that takes into account variable returns to scale, and a DEA model based on the premise that the sum of the gains is zero (constant sum of outputs). It is the latter that is developed in this paper

    Verification of Magnitude and Phase Responses in Fixed-Point Digital Filters

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    In the digital signal processing (DSP) area, one of the most important tasks is digital filter design. Currently, this procedure is performed with the aid of computational tools, which generally assume filter coefficients represented with floating-point arithmetic. Nonetheless, during the implementation phase, which is often done in digital signal processors or field programmable gate arrays, the representation of the obtained coefficients can be carried out through integer or fixed-point arithmetic, which often results in unexpected behavior or even unstable filters. The present work addresses this issue and proposes a verification methodology based on the digital-system verifier (DSVerifier), with the goal of checking fixed-point digital filters w.r.t. implementation aspects. In particular, DSVerifier checks whether the number of bits used in coefficient representation will result in a filter with the same features specified during the design phase. Experimental results show that errors regarding frequency response and overflow are likely to be identified with the proposed methodology, which thus improves overall system's reliability

    Análise genética de características de fertilidade, de crescimento e de produtividade em vacas da raça Canchim.

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    O objetivo deste trabalho foi estimar herdabilidades e correla√ß√Ķes gen√©ticas para idade (IPP), peso (PPP) e escore da condi√ß√£o corporal (EPP) ao primeiro parto, tempo de perman√™ncia no rebanho (TPR), n√ļmero (ND10) e quilograma (QD10) de bezerros desmamados em at√© dez anos de idade, n√ļmero (NDT) e quilograma (QDT) de bezerros desmamados durante a perman√™ncia no rebanho, quilograma de bezerros desmamados por ano de perman√™ncia no rebanho (QTPR), peso adulto (PAD) e par√Ęmetros A e k da curva de crescimento de Bertalanffy de f√™meas de um rebanho da ra√ßa Canchim. As distribui√ß√Ķes a posteriori dos componentes de (co)vari√Ęncia foram obtidas por infer√™ncia bayesiana, em an√°lises bicar√°ter de IPP, PPP e EPP com as outras caracter√≠sticas. Os modelos estat√≠sticos inclu√≠ram os efeitos aleat√≥rios gen√©tico aditivo direto e residual e os efeitos fixos de ano e m√™s de nascimento ou do parto e idade da vaca ao parto, dependendo da caracter√≠stica. As m√©dias a posteriori das herdabilidades foram 0,12 (IPP); 0,51 (PPP); 0,36 (EPP); 0,22 (TPR); 0,24 (ND10); 0,24 (QD10); 0,25 (NDT); 0,23 (QDT); 0,31 (QTPR); 0,56 (PAD); 0,60 (A) e 0,54 (k), indicando que as caracter√≠sticas possuem varia√ß√£o gen√©tica aditiva suficiente para apresentar boa resposta √† sele√ß√£o massal, com exce√ß√£o de IPP. As correla√ß√Ķes gen√©ticas de TPR (-0,35; -0,23 e -0,02), ND10 (-0,33; -0,40 e -0,02), QD10 (-0,47; -0,29 e 0,00), NDT (-0,43; -0,41 e -0,02), QDT (-0,46; -0,28 e 0,00), QTPR (-0,52; -0,35 e 0,00), PAD (0,19; 0,86 e 0,40), A (0,07; 0,09 e -0,18) e k (-0,21; 0,08 e 0,04) com IPP, PPP e EPP, respectivamente, sugerem que a sele√ß√£o para reduzir a IPP deve melhorar a longevidade e as caracter√≠sticas de produtividade das f√™meas; por√©m, o aumento do PPP poder√° prejudic√°-las. Palavras-chave
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