2,694 research outputs found
Tensions to Digital Transformation in Family Businesses: A Paradox Perspective
Organizations are undergoing digital transformation in an increasingly more technological world, pushing traditional businesses, more specifically family businesses, to adopt advanced technologies to remain competitive. Digital transformation is one of the key challenges faced by many family businesses today, however, there is little research around this topic. To address this gap in literature, this study asks: How do the paradoxical tensions of a family business influence its digital transformation? We report on an ongoing historical case study at one of the oldest family businesses in the building and construction industry. In our preliminary analysis, we identify three paradoxical tensions that influence the digital transformation initiatives in a family business. Our next step is to further investigate the approaches that the family businesses have taken to revolve these tensions. We contribute to research and practice by understanding the tensions to digital transformation in family businesses
Jaynes-Cummings Models with trapped surface-state electrons in THz cavities
An electron floating on the liquid Helium is proposed to be trapped (by a
micro-electrode set below the liquid Helium) in a high finesse cavity. Two
lowest levels of the vertical motion of the electron acts as a two-level
"atom", which could resonantly interact with the THz cavity. In the Lamb-Dicke
regime, wherein the electron's in-plane activity region is much smaller than
the wavelength of the cavity mode, the famous Jaynes-Cummings model (JCM) could
be realized. By applying an additional external classical laser beam to the
electron, a driven JCM could also be implemented. With such a driven JCM
certain quantum states, e.g., coherent states and the Schrodinger cat states,
of the THz cavity field could be prepared by one-step evolution. The numerical
results show that, for the typical parameters of the cavity and electron on
liquid Helium, a strong coupling between the artificial atom and the THz cavity
could be obtained.Comment: 11 pages, 1 figure
A Laser-Guided Spinal Cord Displacement Injury in Adult Mice
Mouse models are unique for studying molecular mechanisms of neurotrauma because of the availability of various genetic modified mouse lines. For spinal cord injury (SCI) research, producing an accurate injury is essential, but it is challenging because of the small size of the mouse cord and the inconsistency of injury production. The Louisville Injury System Apparatus (LISA) impactor has been shown to produce precise contusive SCI in adult rats. Here, we examined whether the LISA impactor could be used to create accurate and graded contusive SCIs in mice. Adult C57BL/6 mice received a T10 laminectomy followed by 0.2, 0.5, and 0.8βmm displacement injuries, guided by a laser, from the dorsal surface of the spinal cord using the LISA impactor. Basso Mouse Scale (BMS), grid-walking, TreadScan, and Hargreaves analyses were performed for up to 6 weeks post-injury. All mice were euthanized at the 7th week, and the spinal cords were collected for histological analysis. Our results showed that the LISA impactor produced accurate and consistent contusive SCIs corresponding to mild, moderate, and severe injuries to the cord. The degree of injury severities could be readily determined by the BMS locomotor, grid-walking, and TreadScan gait assessments. The cutaneous hyperalgesia threshold was also significantly increased as the injury severity increased. The terminal lesion area and the spared white matter of the injury epicenter were strongly correlated with the injury severities. We conclude that the LISA device, guided by a laser, can produce reliable graded contusive SCIs in mice, resulting in severity-dependent behavioral and histopathological deficits
2-[4-(4-MethoxyΒphenΒyl)-5-(2-pyridΒyl)-4H-1,2,4-triazol-3-yl]phenol
In the title compound, C20H16N4O2, the benzene rings of the 2-hydroxyΒphenyl and 4-methoxyΒlphenyl groups form dihedral angles of 64.02β
(8) and 77.39β
(7)Β°, respectively, with the mean plane of the triazole ring. The dihedral angle between the triazole ring mean plane and the pyridyl ring is 9.61β
(8)Β°. In the crystal, interΒmolecular NβHβ―O hydrogen bonds link the molΒecules into zigzag chains propagating in [010]
The Radial Distribution of Magnetic Helicity in the Solar Convective Zone: Observations and Dynamo Theory
We continue our attempt to connect observational data on current helicity in
solar active regions with solar dynamo models. In addition to our previous
results about temporal and latitudinal distributions of current helicity
(Kleeorin et al. 2003), we argue that some information concerning the radial
profile of the current helicity averaged over time and latitude can be
extracted from the available observations. The main feature of this
distribution can be presented as follows. Both shallow and deep active regions
demonstrate a clear dominance of one sign of current helicity in a given
hemisphere during the whole cycle. Broadly speaking, current helicity has
opposite polarities in the Northern and Southern hemispheres, although there
are some active regions that violate this polarity rule. The relative number of
active regions violating the polarity rule is significantly higher for deeper
active regions. A separation of active regions into `shallow', `middle' and
`deep' is made by comparing their rotation rate and the helioseismic rotation
law. We use a version of Parker's dynamo model in two spatial dimensions, that
employs a nonlinearity based on magnetic helicity conservation arguments. The
predictions of this model about the radial distribution of solar current
helicity appear to be in remarkable agreement with the available observational
data; in particular the relative volume occupied by the current helicity of
"wrong" sign grows significantly with the depth.Comment: 12 pages, 8 Postscript figures, uses mn2e.cl
{4β²-[4-(4,4β²-Bipyridin-1-ylmethΒyl)phenΒyl]-2,2β²:6β²,2β²β²-terpyridine}chloridoplatinum(II) bisΒ(perchlorate) acetonitrile disolvate sesquihydrate
The asymmetric unit of the title compound, [PtCl(C32H24N5)](ClO4)2Β·2CH3CNΒ·1.5H2O, comprises two unique PtII complex cations, four perchlorate anions, four acetonitrile solvent molΒecules and three water molΒecules. The Pt atom is four-coordinated by a tridentate chelating 2,2β²:6β²,2β²β²-terpyridine ligand and a chloride ion in a square-planar geometry with modest distortion imposed by the constraint of the terpyridyl ligand. The r.m.s. deviations from the plane comprising the four ligand donor atoms and the Pt atom are 0.0381 and 0.0472β
Γ
in the two complex cations
Star formation in self-gravitating disks in active galactic nuclei. I. Metallicity gradients in broad line regions
It has been suggested that the high metallicity generally observed in active
galactic nuclei (AGNs) and quasars originates from ongoing star formation in
the self-gravitating part of accretion disks around the supermassive black
holes. We designate this region as the star forming (SF) disk, in which metals
are produced from supernova explosions (SNexp) while at the same time inflows
are driven by SNexp-excited turbulent viscosity to accrete onto the SMBHs. In
this paper, an equation of metallicity governed by SNexp and radial advection
is established to describe the metal distribution and evolution in the SF disk.
We find that the metal abundance is enriched at different rates at different
positions in the disk, and that a metallicity gradient is set up that evolves
for steady-state AGNs. Metallicity as an integrated physical parameter can be
used as a probe of the SF disk age during one episode of SMBH activity. In the
SF disk, evaporation of molecular clouds heated by SNexp blast waves
unavoidably forms hot gas. This heating is eventually balanced by the cooling
of the hot gas, but we show that the hot gas will escape from the SF disk
before being cooled, and diffuse into the BLRs forming with a typical rate of
\sim 1\sunmyr. The diffusion of hot gas from a SF disk depends on ongoing
star formation, leading to the metallicity gradients in BLR observed in AGNs.
We discuss this and other observable consequences of this scenario.Comment: 11 pages, 5 Figures, ApJ, Vol. 737, in pres
Broad Line Region Physical Conditions along the Quasar Eigenvector 1 Sequence
[Abridged] We compare broad emission line profiles and estimate line ratios
for all major emission lines between Ly-alpha and H-beta in a sample of six
quasars. The sources were chosen with two criteria in mind: the existence of
high quality optical and UV spectra as well as the possibility to sample the
spectroscopic diversity in the 4D Eigenvector 1 context . In the latter sense
each source occupies a region (bin) in the FWHM(H-beta) vs. optical FeII
strength plane that is significantly different from the others. High S/N H-beta
emission line profiles are used as templates for modeling the other lines
(Ly-alpha, CIV 1549, HeII 1640, Al III 1860, Si III] 1892, and Mg II 2800). We
can adequately model all broad lines assuming the existence of three components
distinguished by blueshifted, unshifted and redshifted centroids (indicated as
blue, broad and very broad component respectively). The broad component (high
electron density, low ionization parameter; high column density) is present in
almost all type-1 quasars and therefore corresponds most closely to the
classical broad line emitting region (the reverberating component). The blue
component emission (lower electron density; high ionization; low column
density) arises in less optically thick gas; it is often thought to arise in an
accretion disk wind. The least understood component involves the very broad
component (high ionization and large column density). It is perhaps the most
distinguishing characteristic of quasars with FWHM H-beta > 4000 km/s that
belong to the so-called Population B of our 4DE1 space. Population A quasars
(FWHM H-beta < 4000 km/s) are dominated by broad component emission in H-beta
and blue component emission in CIV 1549 and other high ionization lines. 4DE1
appears to be the most useful current context for revealing and unifying
spectral diversity in type-1 quasars.Comment: 7 Tables, 5 Figures; accepted for publication in Monthly Notices of
the Royal Astronomical Societ
Transcriptional profiling reveals extraordinary diversity among skeletal muscle tissues
Skeletal muscle comprises a family of diverse tissues with highly specialized functions. Many acquired diseases, including HIV and COPD, affect specific muscles while sparing others. Even monogenic muscular dystrophies selectively affect certain muscle groups. These observations suggest that factors intrinsic to muscle tissues influence their resistance to disease. Nevertheless, most studies have not addressed transcriptional diversity among skeletal muscles. Here we use RNAseq to profile mRNA expression in skeletal, smooth, and cardiac muscle tissues from mice and rats. Our data set, MuscleDB, reveals extensive transcriptional diversity, with greater than 50% of transcripts differentially expressed among skeletal muscle tissues. We detect mRNA expression of hundreds of putative myokines that may underlie the endocrine functions of skeletal muscle. We identify candidate genes that may drive tissue specialization, including Smarca4, Vegfa, and Myostatin. By demonstrating the intrinsic diversity of skeletal muscles, these data provide a resource for studying the mechanisms of tissue specialization
Spin excitations and the Fermi surface of superconducting FeS
High-temperature superconductivity occurs near antiferromagnetic
instabilities and nematic state. Debate remains on the origin of nematic order
in FeSe and its relation with superconductivity. Here, we use transport,
neutron scatter- ing and Fermi surface measurements to demonstrate that
hydro-thermo grown superconducting FeS, an isostructure of FeSe, is a
tetragonal paramagnet without nematic order and with a quasiparticle mass
significantly reduced from that of FeSe. Only stripe-type spin excitation is
observed up to 100 meV. No direct coupling between spin excitation and
superconductivity in FeS is found, suggesting that FeS is less correlated and
the nematic order in FeSe is due to competing checkerboard and stripe spin
fluctuations.Comment: 11 pages, 4 page
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