66 research outputs found
On converse bounds for classical communication over quantum channels
We explore several new converse bounds for classical communication over
quantum channels in both the one-shot and asymptotic regimes. First, we show
that the Matthews-Wehner meta-converse bound for entanglement-assisted
classical communication can be achieved by activated, no-signalling assisted
codes, suitably generalizing a result for classical channels. Second, we derive
a new efficiently computable meta-converse on the amount of classical
information unassisted codes can transmit over a single use of a quantum
channel. As applications, we provide a finite resource analysis of classical
communication over quantum erasure channels, including the second-order and
moderate deviation asymptotics. Third, we explore the asymptotic analogue of
our new meta-converse, the -information of the channel. We show that
its regularization is an upper bound on the classical capacity, which is
generally tighter than the entanglement-assisted capacity and other known
efficiently computable strong converse bounds. For covariant channels we show
that the -information is a strong converse bound.Comment: v3: published version; v2: 18 pages, presentation and results
improve
Transferability of Coarse-Grained Force Field for <i>n</i>CB Liquid Crystal Systems
In this paper, the transferability
of the coarse-grained (CG) force
field originally developed for the liquid crystal (LC) molecule 5CB
(Zhang et al. J. Phys. Chem.
B 2012, 116, 2075−2089) was investigated by its homologues
6CB and 8CB molecules. Note that, to construct the 5CB CG force field,
we combined the structure-based and thermodynamic quantities-based
methods and at the same time attempted to use several fragment molecular
systems to derive the CG nonbonded interaction parameters. The resultant
5CB CG force field exhibits a good transferability to some extent.
For example, not only the experimental densities, the local packing
of atom groups, and the antiparallel arrangements of nearest neighboring
molecules, but also the unique LC mesophases as well as the nematic–isotropic
phase transition temperatures of 6CB and 8CB were reproduced. Meanwhile,
the limitations of this 5CB CG force field were also observed, such
as the phase transition from nematic to smectic was postponed to the
lower temperature and the resulting smectic phase structure is single-layer-like
instead of partially interdigitated bilayer-like as observed in underlying
atomistic model. Apparently, more attention should be paid when applying
a CG force field to the state point which is quite different from
which the force field is explicitly parametrized for. The origin of
the above limitations can be potentially traced back to the inherent
simplifications and some approximations often adopted in the creation
process of CG force field, for example, choosing symmetric CG potentials
which do not explicitly include electrostatic interactions and are
parametrized by reproducing the target properties of the specific
nematic 5CB phase at 300 K and 1 atm, as well as using soft nonbonded
potential and excluding torsion barriers. Moreover, although by construction
this CG force field could inevitably incorporate both thermodynamic
and local structural information on the nematic 5CB phase, the anisotropic
diffusion coefficient ratios for different LC phases in both 6CB and
8CB systems are reproduced well. All these findings suggest that the
multiproperty parametrization route together with fragment-based method
provides a new approach to maximize the possibility to simultaneously
reproduce multiple physical properties of a given molecule or related
molecules with similar chemical structures at other state points
Dissipative Particle Dynamics Simulation of the Phase Behavior of T‑Shaped Ternary Amphiphiles Possessing Rodlike Mesogens
We
employed dissipative particle dynamics simulations to explore
the phase behavior of T-shaped ternary amphiphiles composed of rodlike
cores connected by two incompatible end chains and side grafted segments.
By fine-tuning the number of terminal and lateral beads, three phase
diagrams for the model systems with different terminal chain lengths
are constructed in terms of temperature and lateral chain length,
which have some common features and mostly compare favorably with
experimental studies with the exception a couple of new phases. It
is worthwhile to highlight that the mixed cylindrical phase and the
perforated layer phase, as the experimentally observed mesophases
exclusive for facial amphiphilies, are found in simulations for the
first time. Also, a novel gyroid structure is observed in series of
T-shaped ternary amphiphiles for the first time. Furthermore, by evaluating
the effective volume fraction of lateral chains, the phase sequence
spanning from conventional smectic layer phase via perforated layer
structures and polygonal cylindrical arrays to novel lamellar mesophase
is established, which is not just qualitatively consistent with the
related experimental findings but even the stability windows of some
mesophases quantitatively correspond well to experimental results.
The success of reproducing the in-plane ordering of rods in the lamellar
phase as well as the generic phase diagram of such T-shaped ternary
amphiphiles in great detail implies that our genetic model qualitatively
captures many of the characteristics of the phase behavior of real
T-shaped molecules and could serve as a satisfactory basis for further
exploration of self-organization in other related soft matter systems
Descriptive summary.
In a dynamic and competitive business environment, managerial ability emerges as a pivotal strategic factor for capitalizing on new opportunities within the technological revolution and digital transformation of enterprises. Based on data from Chinese A-share listed firms spanning from 2009 to 2019, this study integrates insights from the upper echelons theory and the behavioral theory of the firm to investigate the moderating roles of historical aspiration shortfalls and industrial competitiveness on the relationship between managerial ability and enterprise digital transformation from internal and external pressure perspectives. Our findings indicate a positive impact of managerial ability on digital transformation. The relationship between managerial ability and digital transformation is reinforced by historical aspiration shortfalls; nevertheless, industrial competitiveness has attenuated the aforementioned relationship. This study contributes to a better understanding of the strategic implications of managerial ability within the context of organizational innovation strategies. It offers valuable insights into the decision-making processes of firms as they navigate the challenges of digital transformation within an ever-evolving business environment.</div
Replace the fixed effect models and data.
In a dynamic and competitive business environment, managerial ability emerges as a pivotal strategic factor for capitalizing on new opportunities within the technological revolution and digital transformation of enterprises. Based on data from Chinese A-share listed firms spanning from 2009 to 2019, this study integrates insights from the upper echelons theory and the behavioral theory of the firm to investigate the moderating roles of historical aspiration shortfalls and industrial competitiveness on the relationship between managerial ability and enterprise digital transformation from internal and external pressure perspectives. Our findings indicate a positive impact of managerial ability on digital transformation. The relationship between managerial ability and digital transformation is reinforced by historical aspiration shortfalls; nevertheless, industrial competitiveness has attenuated the aforementioned relationship. This study contributes to a better understanding of the strategic implications of managerial ability within the context of organizational innovation strategies. It offers valuable insights into the decision-making processes of firms as they navigate the challenges of digital transformation within an ever-evolving business environment.</div
S1 File -
In a dynamic and competitive business environment, managerial ability emerges as a pivotal strategic factor for capitalizing on new opportunities within the technological revolution and digital transformation of enterprises. Based on data from Chinese A-share listed firms spanning from 2009 to 2019, this study integrates insights from the upper echelons theory and the behavioral theory of the firm to investigate the moderating roles of historical aspiration shortfalls and industrial competitiveness on the relationship between managerial ability and enterprise digital transformation from internal and external pressure perspectives. Our findings indicate a positive impact of managerial ability on digital transformation. The relationship between managerial ability and digital transformation is reinforced by historical aspiration shortfalls; nevertheless, industrial competitiveness has attenuated the aforementioned relationship. This study contributes to a better understanding of the strategic implications of managerial ability within the context of organizational innovation strategies. It offers valuable insights into the decision-making processes of firms as they navigate the challenges of digital transformation within an ever-evolving business environment.</div
The test of mediating effects based on managerial entrepreneurial orientation mechanism.
The test of mediating effects based on managerial entrepreneurial orientation mechanism.</p
Fig 2 -
In a dynamic and competitive business environment, managerial ability emerges as a pivotal strategic factor for capitalizing on new opportunities within the technological revolution and digital transformation of enterprises. Based on data from Chinese A-share listed firms spanning from 2009 to 2019, this study integrates insights from the upper echelons theory and the behavioral theory of the firm to investigate the moderating roles of historical aspiration shortfalls and industrial competitiveness on the relationship between managerial ability and enterprise digital transformation from internal and external pressure perspectives. Our findings indicate a positive impact of managerial ability on digital transformation. The relationship between managerial ability and digital transformation is reinforced by historical aspiration shortfalls; nevertheless, industrial competitiveness has attenuated the aforementioned relationship. This study contributes to a better understanding of the strategic implications of managerial ability within the context of organizational innovation strategies. It offers valuable insights into the decision-making processes of firms as they navigate the challenges of digital transformation within an ever-evolving business environment.</div
The test of mediating effects based on equity incentive mechanism.
The test of mediating effects based on equity incentive mechanism.</p
Fig 1 -
In a dynamic and competitive business environment, managerial ability emerges as a pivotal strategic factor for capitalizing on new opportunities within the technological revolution and digital transformation of enterprises. Based on data from Chinese A-share listed firms spanning from 2009 to 2019, this study integrates insights from the upper echelons theory and the behavioral theory of the firm to investigate the moderating roles of historical aspiration shortfalls and industrial competitiveness on the relationship between managerial ability and enterprise digital transformation from internal and external pressure perspectives. Our findings indicate a positive impact of managerial ability on digital transformation. The relationship between managerial ability and digital transformation is reinforced by historical aspiration shortfalls; nevertheless, industrial competitiveness has attenuated the aforementioned relationship. This study contributes to a better understanding of the strategic implications of managerial ability within the context of organizational innovation strategies. It offers valuable insights into the decision-making processes of firms as they navigate the challenges of digital transformation within an ever-evolving business environment.</div
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