1,011 research outputs found
ESPECIFICIDADES DA GESTÃO DE PESSOAS NO TERCEIRO SETOR
The development of practices adherent to the specificities and challenges that characterize the Third Sector organizations has been a ground rule to lever the management professionalization in process on these institutions. This article aims to contribute for this process, introducing analyses and results achieved in the study “Specificities of People Management in the Third Sector”, developed throughout the year 2005 and focused on 17 grassroots organizations in the Sao Paulo metropolitan area. From the description of human resource management practices, expectations and needs in the researched sample, reflections were made on priorities and improvements that promote the development and valorization of individual competencies aimed at the organizational development, the alignment of objectives and the accomplishment of the social mission.Desenvolver práticas adequadas às peculiaridades e desafios que caracterizam as entidades do Terceiro Setor tem sido uma questão fundamental para alavancar a profissionalização gerencial em curso nessas organizações. O presente artigo tem por objetivo contribuir nesse processo, apresentando análises e resultados obtidos no estudo “Especificidades da Gestão de Pessoas no Terceiro Setor”, realizado ao longo de 2005, junto a 17 entidades de base situadas na Grande São Paulo. Partindo-se da descrição de práticas, expectativas e necessidades para administração de recursos humanos presentes na amostra pesquisada, são construídas reflexões sobre prioridades e aperfeiçoamentos que promovam o desenvolvimento e a valorização das competências e contribuições individuais, orientadas para o desenvolvimento organizacional, o alinhamento de objetivos e a consecução da missão social
GESTÃO DA QUALIDADE DE VIDA NO TRABALHO E ESTRATÉGIA EMPRESARIAL: ESTUDO DE CASO NA EMPRESA X
Nos últimos anos, as organizações, principalmente aquelas consideradas de grande porte, vêm dando considerável
importância à formulação e implementação de estratégias, como forma de obter excelência em sua gestão e manter sua própria sobrevivência no mercado, que se apresenta cada vez mais competitivo. Este trabalho tem por objetivo identificar em que sentido as estratégias empresariais de uma organização estão sintonizadas com os programas de Gestão de Qualidade de Vida no Trabalho (GQVT). Realizou-se um estudo na Empresa X, uma montadora, que apresenta as características desejadas para este projeto, ou seja, possui estratégias definidas pela alta direção e desenvolve ações que define como sendo de qualidade de vida no trabalho. Foram realizadas três entrevistas semiestruturadas e em profundidade: duas delas com representantes da alta administração e uma com o representante da comissão da fábrica. Concluiu-se que as estratégias da Empresa X estão sintonizadas parcialmente com o seu “programa” de Gestão de Qualidade de Vida no Trabalho. As ações de GQVT estão sintonizadas com os objetivos
estratégicos da empresa, que é produtividade em um caso de estratégia de excelência operacional. Por outro lado, percebe-se uma dissociação da realidade cotidiana, em termos do discurso da alta direção e dos gestores de RH
The MillenniumTNG Project: High-precision predictions for matter clustering and halo statistics
Cosmological inference with large galaxy surveys requires theoretical models
that combine precise predictions for large-scale structure with robust and
flexible galaxy formation modelling throughout a sufficiently large cosmic
volume. Here, we introduce the MillenniumTNG (MTNG) project which combines the
hydrodynamical galaxy formation model of IllustrisTNG with the large volume of
the Millennium simulation. Our largest hydrodynamic simulation, covering (500
Mpc/h)^3 = (740 Mpc)^3, is complemented by a suite of dark-matter-only
simulations with up to 4320^3 dark matter particles (a mass resolution of 1.32
x 10^8 Msun/h) using the fixed-and-paired technique to reduce large-scale
cosmic variance. The hydro simulation adds 4320^3 gas cells, achieving a
baryonic mass resolution of 2 x 10^7 Msun/h. High time-resolution merger trees
and direct lightcone outputs facilitate the construction of a new generation of
semi-analytic galaxy formation models that can be calibrated against both the
hydro simulation and observation, and then applied to even larger volumes -
MTNG includes a flagship simulation with 1.1 trillion dark matter particles and
massive neutrinos in a volume of (3000 Mpc)^3. In this introductory analysis we
carry out convergence tests on basic measures of non-linear clustering such as
the matter power spectrum, the halo mass function and halo clustering, and we
compare simulation predictions to those from current cosmological emulators. We
also use our simulations to study matter and halo statistics, such as halo bias
and clustering at the baryonic acoustic oscillation scale. Finally we measure
the impact of baryonic physics on the matter and halo distributions.Comment: submitted to MNRAS, 23 pages, 19 figures, for future public data
release, see https://www.mtng-project.or
The MillenniumTNG Project: semi-analytic galaxy formation models on the past lightcone
Upcoming large galaxy surveys will subject the standard cosmological model, Lambda Cold Dark Matter, to new precision tests. These can be tightened considerably if theoretical models of galaxy formation are available that can predict galaxy clustering and galaxy–galaxy lensing on the full range of measurable scales, throughout volumes as large as those of the surveys, and with sufficient flexibility that uncertain aspects of the underlying astrophysics can be marginalized over. This, in particular, requires mock galaxy catalogues in large cosmological volumes that can be directly compared to observation, and can be optimized empirically by Monte Carlo Markov Chains or other similar schemes, thus eliminating or estimating parameters related to galaxy formation when constraining cosmology. Semi-analytic galaxy formation methods implemented on top of cosmological dark matter simulations offer a computationally efficient approach to construct physically based and flexibly parametrized galaxy formation models, and as such they are more potent than still faster, but purely empirical models. Here, we introduce an updated methodology for the semi-analytic L-GALAXIES code, allowing it to be applied to simulations of the new MillenniumTNG project, producing galaxies directly on fully continuous past lightcones, potentially over the full sky, out to high redshift, and for all galaxies more massive than ∼ 108 M. We investigate the numerical convergence of the resulting predictions, and study the projected galaxy clustering signals of different samples. The new methodology can be viewed as an important step towards more faithful forward-modelling of observational data, helping to reduce systematic distortions in the comparison of theory to observations
The MillenniumTNG Project: the large-scale clustering of galaxies
Modern redshift surveys are tasked with mapping out the galaxy distribution over enormous distance scales. Existing hydrodynamical simulations, however, do not reach the volumes needed to match upcoming surveys. We present results for the clustering of galaxies using a new, large volume hydrodynamical simulation as part of the MillenniumTNG (MTNG) project. With a computational volume that is ≈15 times larger than the next largest such simulation currently available, we show that MTNG is able to accurately reproduce the observed clustering of galaxies as a function of stellar mass. When separated by colour, there are some discrepancies with respect to the observed population, which can be attributed to the quenching of satellite galaxies in our model. We combine MTNG galaxies with those generated using a semi-analytic model to emulate the sample selection of luminous red galaxies (LRGs) and emission-line galaxies (ELGs) and show that, although the bias of these populations is approximately (but not exactly) constant on scales larger than ≈10 Mpc, there is significant scale-dependent bias on smaller scales. The amplitude of this effect varies between the two galaxy types and between the semi-analytic model and MTNG. We show that this is related to the distribution of haloes hosting LRGs and ELGs. Using mock SDSS-like catalogues generated on MTNG lightcones, we demonstrate the existence of prominent baryonic acoustic features in the large-scale galaxy clustering. We also demonstrate the presence of realistic redshift space distortions in our mocks, finding excellent agreement with the multipoles of the redshift-space clustering measured in SDSS data
The MillenniumTNG Project: The galaxy population at
The early release science results from have yielded an
unexpected abundance of high-redshift luminous galaxies that seems to be in
tension with current theories of galaxy formation. However, it is currently
difficult to draw definitive conclusions form these results as the sources have
not yet been spectroscopically confirmed. It is in any case important to
establish baseline predictions from current state-of-the-art galaxy formation
models that can be compared and contrasted with these new measurements. In this
work, we use the new large-volume ()
hydrodynamic simulation of the MillenniumTNG project, suitably scaled to match
results from higher resolution - smaller volume simulations, to make
predictions for the high-redshift () galaxy population and compare
them to recent observations. We show that the simulated galaxy
population is broadly consistent with observations until . From
, the observations indicate a preference for a galaxy population
that is largely dust-free, but is still consistent with the simulations. Beyond
, however, our simulation results underpredict the abundance of
luminous galaxies and their star-formation rates by almost an order of
magnitude. This indicates either an incomplete understanding of the new
data or a need for more sophisticated galaxy formation models
that account for additional physical processes such as Population~III stars,
variable stellar initial mass functions, or even deviations from the standard
CDM model. We emphasise that any new process invoked to explain this
tension should only significantly influence the galaxy population beyond
, while leaving the successful galaxy formation predictions of the
fiducial model intact below this redshift.Comment: Accepted for publication in MNRAS -- Part of the initial set of
papers introducing the MillenniumTNG project. Visit www.mtng-project.org for
more detail
The MillenniumTNG Project: the impact of baryons and massive neutrinos on high-resolution weak gravitational lensing convergence maps
We study weak gravitational lensing convergence maps produced from the MILLENNIUMTNG simulations by direct projection of the mass distribution on the past backwards lightcone of a fiducial observer. We explore the lensing maps over a large dynamic range in simulation mass and angular resolution, allowing us to establish a clear assessment of numerical convergence. By comparing full physics hydrodynamical simulations with corresponding dark-matter-only runs, we quantify the impact of baryonic physics on the most important weak lensing statistics. Likewise, we predict the impact of massive neutrinos reliably far into the non-linear regime. We also demonstrate that the ‘fixed & paired’ variance suppression technique increases the statistical robustness of the simulation predictions on large scales not only for time slices but also for continuously output lightcone data. We find that both baryonic and neutrino effects substantially impact weak lensing shear measurements, with the latter dominating over the former on large angular scales. Thus, both effects must explicitly be included to obtain sufficiently accurate predictions for stage IV lensing surveys. Reassuringly, our results agree accurately with other simulation results where available, supporting the promise of simulation modelling for precision cosmology far into the non-linear regime
The MillenniumTNG Project: Refining the one-halo model of red and blue galaxies at different redshifts
Luminous red galaxies (LRGs) and blue star-forming emission-line galaxies
(ELGs) are key tracers of large-scale structure used by cosmological surveys.
Theoretical predictions for such data are often done via simplistic models for
the galaxy-halo connection. In this work, we use the large, high-fidelity
hydrodynamical simulation of the MillenniumTNG project (MTNG) to inform a new
phenomenological approach for obtaining an accurate and flexible galaxy-halo
model on small scales. Our aim is to study LRGs and ELGs at two distinct
epochs, and , and recover their clustering down to very small
scales, , i.e. the one-halo regime, while a companion
paper extends this to a two-halo model for larger distances. The occupation
statistics of ELGs in MTNG inform us that: (1) the satellite occupations
exhibit a slightly super-Poisson distribution, contrary to commonly made
assumptions, and (2) that haloes containing at least one ELG satellite are
twice as likely to host a central ELG. We propose simple recipes for modeling
these effects, each of which calls for the addition of a single free parameter
to simpler halo occupation models. To construct a reliable satellite population
model, we explore the LRG and ELG satellite radial and velocity distributions
and compare them with those of subhalos and particles in the simulation. We
find that ELGs are anisotropically distributed within halos, which together
with our occupation results provides strong evidence for cooperative galaxy
formation (manifesting itself as one-halo galaxy conformity); i.e.~galaxies
with similar properties form in close proximity to each other. Our refined
galaxy-halo model represents a useful improvement of commonly used analysis
tools and thus can be of help to increase the constraining power of large-scale
structure surveys.Comment: 14 pages, 10 figures; submitted to MNRA
The MillenniumTNG Project: An improved two-halo model for the galaxy-halo connection of red and blue galaxies
Approximate methods to populate dark matter halos with galaxies are of great
utility to large galaxy surveys. However, the limitations of simple halo
occupation models (HODs) preclude a full use of small-scale galaxy clustering
data and call for more sophisticated models. We study two galaxy populations,
luminous red galaxies (LRGs) and star-forming emission-line galaxies (ELGs), at
two epochs, and , in the large volume, high-resolution
hydrodynamical simulation of the MillenniumTNG project. In a partner study we
concentrated on the small-scale, one-halo regime down to , while here we focus on modeling galaxy assembly bias in the two-halo
regime, . Interestingly, the ELG signal exhibits scale
dependence out to relatively large scales (), implying
that the linear bias approximation for this tracer is invalid on these scales,
contrary to common assumptions. The 10-15\% discrepancy present in the standard
halo model prescription is only reconciled when we augment our halo occupation
model with a dependence on extrinsic halo properties ("shear" being the
best-performing one) rather than intrinsic ones (e.g., concentration, peak
mass). We argue that this fact constitutes evidence for two-halo galaxy
conformity. Including tertiary assembly bias (i.e. a property beyond mass and
"shear") is not an essential requirement for reconciling the galaxy assembly
bias signal of LRGs, but the combination of external and internal properties is
beneficial for recovering ELG the clustering. We find that centrals in low-mass
haloes dominate the assembly bias signal of both populations. Finally, we
explore the predictions of our model for higher-order statistics such as
nearest-neighbor counts. The latter supplies additional information about
galaxy assembly bias and can be used to break degeneracies between halo model
parameters.Comment: 16 pages, 8 figures; submitted to MNRA
Evolution of cosmic filaments in the MTNG simulation
We present a study of the evolution of cosmic filaments across redshift with an emphasis on some important properties: filament lengths, growth rates, and radial profiles of galaxy densities. Following an observation-driven approach, we built cosmic filament catalogues at z = 0, 1, 2, 3, and 4 from the galaxy distributions of the large hydro-dynamical run of the MilleniumTNG project. We employed the extensively used DisPerSE cosmic web finder code, for which we provide a user-friendly guide, including the details of a physics-driven calibration procedure, with the hope of helping future users. We performed the first statistical measurements of the evolution of connectivity in a large-scale simulation, finding that the connectivity of cosmic nodes (defined as the number of filaments attached) globally decreases from early to late times. The study of cosmic filaments in proper coordinates reveals that filaments grow in length and radial extent, as expected from large-scale structures in an expanding Universe. But the most interesting results arise once the Hubble flow is factored out. We find remarkably stable comoving filament length functions and over-density profiles, showing only little evolution of the total population of filaments in the past ∼12.25 Gyr. However, by tracking the spatial evolution of individual structures, we demonstrate that filaments of different lengths actually follow different evolutionary paths. While short filaments preferentially contract, long filaments expand along their longitudinal direction with growth rates that are the highest in the early, matter-dominated Universe. Filament diversity at a fixed redshift is also shown by the different (∼5σ) density values between the shortest and longest filaments. Our results hint that cosmic filaments can be used as additional probes for dark energy, but further theoretical work is still needed
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