725 research outputs found
Energy performance and capital expenditures in manufacturing industries
Little is known about how firms change energy consumption over time. Yet, to meet global climate change targets, understanding how changes in firm investment impact environmental performance is important for policymakers and firms alike. To investigate the environmental performance of firms, we measure the energy consumption and efficiency of firms in the Netherlands’ manufacturing industries before and after large capital expenditures over the 2000 to 2008 period. Unique to this data set is that firm investment is decomposed into the following three streams: investment in buildings only, investment in equipment only, or a simultaneous investment in both buildings and equipment. We find that firms increase energy consumption when experiencing a simultaneous investment. However, after large capital expenditures, energy efficiency increases. Further decomposition by firm types suggests that the building capital investments of firms active in high-tech, energy-intensive, and low labor-intensive industries do not coincide with energy efficiency improvements while energy efficiency does increase with capital expenditures in equipment. From a policy perspective, it is important for regulators to understand firm investment and production processes, which help regulators understand when and where energy efficiency increases are feasible across firm types and expansionary production strategies. Firms, regulators, and other third parties may work together to develop an energy efficiency plan in line with investment strategies, including enhanced transparency by firms, energy efficiency subsidies, and R&D tax credits, for innovation. Targeted agreements may work to cooperatively improve energy performance
On the prospects of imaging Sagittarius A* from space
Very Long Baseline Interferometry (VLBI) at sub-millimeter waves has the
potential to image the shadow of the black hole in the Galactic Center,
Sagittarius A* (Sgr A*), and thereby test basic predictions of the theory of
general relativity. We investigate the imaging prospects of a new Space VLBI
mission concept. The setup consists of two satellites in polar or equatorial
circular Medium-Earth Orbits with slightly different radii, resulting in a
dense spiral-shaped uv-coverage with long baselines, allowing for extremely
high-resolution and high-fidelity imaging of radio sources. We simulate
observations of a general relativistic magnetohydrodynamics model of Sgr A* for
this configuration with noise calculated from model system parameters. After
gridding the -plane and averaging visibilities accumulated over multiple
months of integration, images of Sgr A* with a resolution of up to 4 as
could be reconstructed, allowing for stronger tests of general relativity and
accretion models than with ground-based VLBI.Comment: 4 pages, 4 figures, published in Proceedings IAU Symposium No. 342,
201
The 492 GHz emission of Sgr A* constrained by ALMA
We report linearly polarized continuum emission properties of Sgr A* at
492 GHz, based on the Atacama Large Millimeter Array (ALMA) observations.
We used the observations of the likely unpolarized continuum emission of Titan,
and the observations of C\textsc{i} line emission, to gauge the degree of
spurious polarization. The Stokes I flux of 3.60.72 Jy during our run is
consistent with extrapolations from the previous, lower frequency observations.
We found that the continuum emission of Sgr A* at 492 GHz shows large
amplitude differences between the XX and the YY correlations. The observed
intensity ratio between the XX and YY correlations as a function of parallactic
angle may be explained by a constant polarization position angle of
1583. The fitted polarization percentage of Sgr
A* during our observational period is 14\%1.2\%. The calibrator quasar
J1744-3116 we observed at the same night can be fitted to Stokes I = 252 mJy,
with 7.9\%0.9\% polarization in position angle P.A. =
4.14.2. The observed polarization percentage and
polarization position angle in the present work appear consistent with those
expected from longer wavelength observations in the period of 1999-2005. In
particular, the polarization position angle at 492 GHz, expected from the
previously fitted 1677 intrinsic polarization position
angle and (-5.60.7)10 rotation measure, is 155,
which is consistent with our new measurement of polarization position angle
within 1. The polarization percentage and the polarization position
angle may be varying over the period of our ALMA 12m Array observations, which
demands further investigation with future polarization observations.Comment: 10 pages, 6 figures, 1st referee report received and revise
Family Involvement in Management and Product Innovation: The Mediating Role of R&D Strategies
Following calls to capture family firms’ innovative behavior and to specifically clarify how family firms manage product innovations to achieve sustainable economic development, this study empirically investigates the mediating role of Research & Development (R&D) strategies (i.e., intramural R&D investments, extramural R&D investments, and the combination of both intramural and extramural R&D investments) in the relationship between family involvement in the management and likelihood of obtaining product innovations. Carrying out a panel data analysis that is based on 7264 observations of Spanish manufacturing firms throughout the 2000–2015 period, our results suggest a negative effect of the level of family management on the likelihood of introducing product innovations. Moreover, we found that intramural R&D investments and the investment strategy consisting of both intramural and extramural R&D mediated the family involvement in management-likelihood of obtaining product innovations relationship. Our findings contribute important insights to the comprehension of which determinants instigate product innovation in family managed firms
Angiotensin II-inhibition:effect on Alzheimer's pathology in the aged triple transgenic mouse
ontext. Radio and mm-wavelength observations of Sagittarius A* (Sgr A*), the radio source associated with the supermassive black hole at the center of our Galaxy, show that it behaves as a partially self-absorbed synchrotron-emitting source. The measured size of Sgr A* shows that the mm-wavelength emission comes from a small region and consists of the inner accretion flow and a possible collimated outflow. Existing observations of Sgr A* have revealed a time lag between light curves at 43 GHz and 22 GHz, which is consistent with a rapidly expanding plasma flow and supports the presence of a collimated outflow from the environment of an accreting black hole. Aims. Here we wish to measure simultaneous frequency-dependent time lags in the light curves of Sgr A* across a broad frequency range to constrain direction and speed of the radio-emitting plasma in the vicinity of the black hole. Methods. Light curves of Sgr A* were taken in May 2012 using ALMA at 100 GHz using the VLA at 48, 39, 37, 27, 25.5, and 19 GHz. As a result of elevation limits and the longitude difference between the stations, the usable overlap in the light curves is approximately four hours. Although Sgr A* was in a relatively quiet phase, the high sensitivity of ALMA and the VLA allowed us to detect and fit maxima of an observed minor flare where flux density varied by ~10%. Results. The fitted times of flux density maxima at frequencies from 100 GHz to 19 GHz, as well as a cross-correlation analysis, reveal a simple frequency-dependent time lag relation where maxima at higher frequencies lead those at lower frequencies. Taking the observed size-frequency relation of Sgr A* into account, these time lags suggest a moderately relativistic (lower estimates: 0.5c for two-sided, 0.77c for one-sided) collimated outflow
The 492 GHz emission of Sgr A* constrained by ALMA
We report linearly polarized continuum emission properties of Sgr A* at 492 GHz, based on the Atacama Large Millimeter Array (ALMA) observations. We used the observations of the likely unpolarized continuum emission of Titan, and the observations of C\textsc{i} line emission, to gauge the degree of spurious polarization. The Stokes I flux of 3.60.72 Jy during our run is consistent with extrapolations from the previous, lower frequency observations. We found that the continuum emission of Sgr A* at 492 GHz shows large amplitude differences between the XX and the YY correlations. The observed intensity ratio between the XX and YY correlations as a function of parallactic angle may be explained by a constant polarization position angle of 1583. The fitted polarization percentage of Sgr A* during our observational period is 14\%1.2\%. The calibrator quasar J1744-3116 we observed at the same night can be fitted to Stokes I = 252 mJy, with 7.9\%0.9\% polarization in position angle P.A. = 4.14.2. The observed polarization percentage and polarization position angle in the present work appear consistent with those expected from longer wavelength observations in the period of 1999-2005. In particular, the polarization position angle at 492 GHz, expected from the previously fitted 1677 intrinsic polarization position angle and (-5.60.7)10 rotation measure, is 155, which is consistent with our new measurement of polarization position angle within 1. The polarization percentage and the polarization position angle may be varying over the period of our ALMA 12m Array observations, which demands further investigation with future polarization observations
Greening in the spotlight:How public inquisitiveness shapes European SMEs' actions in response to climate concerns
We examine greening activities among European small and medium-sized enterprises (SMEs) in the product and process domains, and argue that greater public climate concern in an SME's home country environment primarily associates with greening in the inherently more visible product domain. Moreover, we introduce the concept of public inquisitiveness and propose that greater inquisitiveness prompts SMEs to also pay attention to less visible process greening activities as a response to public climate pressures. We test our ideas using multilevel regression models on a large representative sample of SMEs from 18 European Union (EU) countries. The study's main ideas are supported by the findings, which point to possible trade-offs between product and process greening among resource-constrained SMEs, and suggest the general public's inquisitiveness indeed plays a key role in preventing under engagement in less outwardly visible greening strategies. We discuss our study's implications for discourse on how and under which conditions normative institutional forces shape firm-level sustainable behavior, as well as for SMEs' pro-environmental stakeholders.</p
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