77 research outputs found
The social side of software platform ecosystems
Software ecosystems as a paradigm for large-scale software development encompass a complex mix of technical, business, and social aspects. While significant research has been conducted to understand both the technical and business aspects, the social aspects of software ecosystems are less well understood. To close this gap, this paper presents the results of an empirical study aimed at understanding the influence of social aspects on developers' participation in software ecosystems. We conducted 25 interviews with mobile software developers and an online survey with 83 respondents from the mobile software development community. Our results point out a complex social system based on continued interaction and mutual support between different actors, including developers, friends, end users, developers from large companies, and online communities. These findings highlight the importance of social aspects in the sustainability of software ecosystems both during the initial adoption phase as well as for long-term permanence of developers.Cleidson R. B. de Souza, Fernando Figueira Filho, Müller Miranda, Renato Pina Ferreira, Christoph Treude, Leif Singe
Effects of Ga+ milling on InGaAsP Quantum Well Laser with mirrors etched by Focused Ion Beam
InGaAsP/InP quantum wells (QW) ridge waveguide lasers were fabricated for the
evaluation of Ga+ Focused Ion Beam (FIB) milling of mirrors. Electrical and
optical proprieties were investigated. A 7% increment in threshold current, a
17% reduction in external quantum efficiency and 15 nm blue shift in the
emission spectrum were observed after milling as compared to the as cleaved
facet result. Annealing in inert atmosphere partially revert these effects
resulting in 4% increment in threshold current, 11% reduction in external
efficiency and 13 nm blue shift with the as cleaved result. The current-voltage
behavior after milling and annealing shows a very small increase in leakage
current indicating that optical damage is the main effect of the milling
process.Comment: 12 pages, 4 figure
Avaliação alelopática de extratos brutos e do óleo essencial das folhas de Virola surinamensis.
QB-021
Be+Sn scattering at near-barrier energies within a four body model
Cross sections for elastic and inelastic scattering of the weakly-bound
Be nucleus on a Sn target have been measured at seven bombarding
energies around and above the Coulomb barrier. The elastic angular
distributions are analyzed with a four-body continuum-discretized
coupled-channels (CDCC) calculation, which considers Be as a three-body
projectile ( + + n). An optical model analysis using the S\~ao
Paulo potential is also shown for comparison. The CDCC analysis shows that the
coupling to the continuum part of the spectrum is important for the agreement
with experimental data even at energies around the Coulomb barrier, suggesting
that breakup is an important process at low energies. At the highest incident
energies, two inelastic peaks are observed at 1.19(5) and 2.41(5) MeV.
Coupled-channels (CC) calculations using a rotational model confirm that the
first inelastic peak corresponds to the excitation of the 2 state in
Sn, while the second one likely corresponds to the excitation of the
3 state.Comment: 11 pages, 9 figures. Accepted as PR
Combining ability of summer-squash lines with different degrees of parthenocarpy and PRSV-W resistance
The aim was to assess heterosis in a set of 16 summer-squash hybrids, and evaluate the combining capacity of the respective parental lines, which differed as to the degree of parthenocarpy and resistance to PRSV-W (Papaya Ringspot Virus-Watermelon strain). The hybrids were obtained using a partial diallel cross design (4 × 4). The lines of parental group I were 1 = ABX-037G-77-03-05-01-01-bulk, 2 = ABX-037G-77-03-05-03-10-bulk, 3 = ABX-037G-77-03-05-01-04-bulk and 4 = ABX-037G-77-03-05-05-01-bulk, and of group II, 1′ = ABX-037G-77-03-05-04-08-bulk, 2′ = ABX-037G-77-03-05-02-11-bulk, 3′ = Clarice and 4′ = Caserta. The 16 hybrids and eight parental lines were evaluated for PRSV-W resistance, parthenocarpic expression and yield in randomized complete-block designs, with three replications. Parthenocarpy and the resistance to PRSV-W were rated by means of a scale from 1 to 5, where 1 = non-parthenocarpic or high resistance to PRSV-W, and 5 = parthenocarpic or high susceptibility to PRSV-W. Both additive and non-additive gene effects were important in the expression of parthenocarpy and resistance to PRSV-W. Whereas estimates of heterosis in parthenocarpy usually tended towards a higher degree, resistance to PRSV-W was towards higher susceptibility. At least one F1 hybrid was identified with a satisfactory degree of parthenocarpy, resistance to PRSV-W and high fruit-yield
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