5,177 research outputs found
The Permeability of Network Boundaries: Strategic Alliances in the Japanese Electronics Industry in the 1990s
This paper looks at the choice of strategic partners for alliance formation in the Japanese electronics industry during the post-bubble economic period 1992-97. Results from a dyad analysis of 128 companies suggest that firms tend to look for partners within their existing vertical keiretsu networks of organizations for alliances that target the creation of resources that build on existing knowledge (production or distribution) but that this common keiretsu effect disappears for alliances that involve new knowledge creation (new product or technology development). The role of corporate networks, environmental uncertainty and their implications for our understanding of strategic alliance formation and the dynamics of social networks are discussed.
Strategic Alliances in the Japanese Economy: Types, Critiques, Embeddedness, and Change
This paper provides an overview and interpretive analysis of the Japanese strategic alliance process. Both international and domestic alliances are considered, although the emphasis is on domestic partnerships. I argue that the domestic Japanese economy is "underallianced" relative to Japanese firms' extensive involvement in partnerships with foreign firms. This is particularly true if government-sponsored consortia and keiretsu-based tie-ups are excluded. Japanese companies appear, for a variety of institutional and cultural reasons, to have had some difficulty partnering with strangers and competitors and that has led to the formation of fewer synergistic and otherwise constructive intra-country cooperation arrangements than corporate Japan arguably needs. That pattern is changing, however, and there is evidence that the rate of intra-country alliances among Japanese firms is accelerating, particularly when the focus of the alliance is technology and innovation.
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Changing firm boundaries in Japanese auto parts supply networks
The Japanese and the US business presses are full of articles about change in Japanese business practices-in particular, changes in relationships between customers and suppliers. Are closely knit networks of customers and suppliers-the keiretsu-breaking down? We argue that while there is no sign of a dramatic, abrupt breakdown in the system, Japanese automakers are beginning to rethink the make versus buy decision. Automakers are taking firmer control over some transactions while allowing others to become more arms-length. These changes are traceable to some basic changes in the transactions themselves-increased power on the part of suppliers due to changes in technology and globalization, and decreased need for customer-specific investments due to standardization. Furthermore, a sense of economic crisis has caused Japanese firms to question the value of certain business practices, and has made it easier for automakers to rethink their contracting relationships
Proper Motion of Water Masers Associated with IRAS 21391+5802: Bipolar Outflow and an AU-Scale Dusty Circumstellar Shell
We present VLBA observations of water maser emission associated with the
star-forming region IRAS 21391+5802, which is embedded in a bright rimmed
cometary globule in IC1396. The angular resolution of the maps is about 0.8
mas, corresponding to a spatial resolution of about 0.6 AU, at an estimated
distance of 750 pc. Proper motions are derived for 10 maser features identified
consistently over three epochs, which were separated by intervals of about one
month. The masers appear in four groups, which are aligned linearly on the sky,
roughly along a northeast-southwest direction, with a total separation of about
520 AU (about 0.7 arcseconds). The 3-D velocities of the masers have a maximum
value of about 42 km/s (about 9 AU/yr). The average error on the derived proper
motions is about 4 km/s. The overall pattern of proper motions is indicative of
a bipolar outflow. Proper motions of the masers in a central cluster, with a
projected extent of about 20 AU, show systematic deviations from a radial
outflow. However, we find no evidence of Keplerian rotation, as has been
claimed elsewhere. A nearly circular loop of masers lies near the middle of the
cluster. The radius of this loop is 1 AU and the line-of-sight velocities of
the masers in the loop are within 2 km/s of the systemic velocity of the
region. These masers presumably exist at the radial distance where significant
dust condensation occurs in the outflow emanating from the star.Comment: 15 pages, 4 figures. Accepted for publication in the Astrophysical
Journal. Version 2.12.00: Astrometric coordinates of maser revise
Taxonomic voucher specimens for study of post-wildfire forest habitat in Douglas County, Oregon
this publication provides data about voucher specimens deposited in the museum in conjunction with a research project on pollinators
X-ray Luminosity and Absorption Column Fluctuations in the H2O Maser Galaxy NGC 4258 from Weeks to Years
We report monitoring of the 0.3-10 keV spectrum of NGC4258 with XMM over 1.5
years.We als o report reprocessing of an overlapping series of archival Chandra
observations. By including earlier ASCA and SAX observations, we present a new,
nine-year time series of models fit to the X-ray spectrum of NGC4258. Over the
nine years, the photoelectric absorbing column (~10^23 cm^-2) did not vary
detectably, except for a ~40% drop between two ASCA epochs separated by 3 years
and a ~60% rise between two XMM epochs separated by just 5 months. In contrast,
factor of 2-3 changes are seen in absorbed flux on the timescale of years.
These are uncorrelated with changes in absorbing column and indicative of
central engine variability. The most rapid change in luminosity (5-10 keV) that
we detect is ~30% over 19 days. The warped disk, a known source of H2O maser
emission in NGC4258, is believed to cross the line of sight to the central
engine. We propose that the variations in absorbing column arise from
inhomogeneities sweeping across the line of sight in the rotating disk at the
radius where the disk crosses the line of sight. We estimate that the
inhomogeneities are ~10^15 cm in size at the crossing radius of 0.29 pc,
slightly smaller than the expected scale height of the disk. This result thus
provides strong evidence that the warped accretion disk is the absorber. This
is the first direct confirmation that obscuration in type-2 AGN may, in some
cases, arise in thin, warped accretion disks, rather than in geometrically
thick tori. We do not detect Fe Kalpha line emission in any of our XMM spectra.
We do not observe evidence of absorption lines in the XMM or reprocessed
Chandra data.Comment: 36 pages,14 figures. Accepted for publication in Ap
A Binary Millisecond Pulsar in Globular Cluster NGC6544
We report the detection of a new 3.06 ms binary pulsar in the globular
cluster NGC6544 using a Fourier-domain ``acceleration'' search. With an implied
companion mass of ~0.01 solar masses and an orbital period of only P_b~1.7
hours, it displays very similar orbital properties to many pulsars which are
eclipsed by their companion winds. The orbital period is the second shortest of
known binary pulsars after 47 Tuc R. The measured flux density of 1.3 +/- 0.4
mJy at 1332 MHz indicates that the pulsar is almost certainly the known
steep-spectrum point source near the core of NGC6544.Comment: Accepted by ApJ Letters on 11 October 2000, 5 page
VLBA Imaging of the OH Maser in IIIZw35
We present a parsec-scale image of the OH maser in the nucleus of the active
galaxy IIIZw35, made using the Very Long Baseline Array at a wavelength of 18
cm. We detected two distinct components, with a projected separation of 50 pc
(for D=110 Mpc) and a separation in Doppler velocity of 70 km/s, which contain
50% of the total maser flux. Velocity gradients within these components could
indicate rotation of clouds with binding mass densities of ~7000 solar masses
per cubic parsec, or total masses of more than 500,000 solar masses. Emission
in the 1665-MHz OH line is roughly coincident in position with that in the
1667-MHz line, although the lines peak at different Doppler velocities. We
detected no 18 cm continuum emission; our upper limit implies a peak apparent
optical depth greater than 3.4, assuming the maser is an unsaturated amplifier
of continuum radiation.Comment: 10 pages, 3 figure
Discovery of Water Maser Emission in Five AGN and a Possible Correlation Between Water Maser and Nuclear 2-10 keV Luminosities
We report the discovery of water maser emission in five active galactic
nuclei (AGN) with the 100-m Green Bank Telescope (GBT). The positions of the
newly discovered masers, measured with the VLA, are consistent with the optical
positions of the host nuclei to within 1 sigma (0.3 arcsec radio and 1.3 arcsec
optical) and most likely mark the locations of the embedded central engines.
The spectra of three sources, 2MASX J08362280+3327383, NGC 6264, and UGC 09618
NED02, display the characteristic spectral signature of emission from an
edge-on accretion disk with maximum orbital velocity of ~700, ~800, and ~1300
km s^-1, respectively. We also present a GBT spectrum of a previously known
source MRK 0034 and interpret the narrow Doppler components reported here as
indirect evidence that the emission originates in an edge-on accretion disk
with orbital velocity of ~500 km s^-1. We obtained a detection rate of 12
percent (5 out of 41) among Seyfert 2 and LINER systems with 10000 km s^-1 <
v_sys < 15000 km s^-1. For the 30 nuclear water masers with available hard
X-ray data, we report a possible relationship between unabsorbed X-ray
luminosity (2-10 keV) and total isotropic water maser luminosity, L_{2-10}
proportional to L_{H2O}^{0.5+-0.1}, consistent with the model proposed by
Neufeld and Maloney in which X-ray irradiation and heating of molecular
accretion disk gas by the central engine excites the maser emission.Comment: 16 pages, 5 tables, 3 figures, to appear in the November 10, 2006,
v651n2 issue of the Astrophysical Journa
Understanding childrenâs constructions of meanings about other children: implications for inclusiveeducation
This paper explores the factors that influence the way children construct meanings about other children, and especially those who seem to experience marginalisation, within school contexts. The research involved an ethnographic study in a primary school in Cyprus over a period of 5 months. Qualitative methods were used, particularly participant observations and interviews with children. Interpretation of the data suggests that children's perceptions about other children, and especially those who come to experience marginalisation, are influenced by the following factors: other children and the interactions between them; adultsâ way of behaving in the school; the existing structures within the school; and the cultures of the school and the wider educational context. Even though the most powerful factor was viewed to be the adultsâ influence, it was rather the interweaving between different factors that seemed to lead to the creation of particular meanings for other children. In the end, it is argued that children's voices should be seen as an essential element within the process of developing inclusive practices.<br/
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