10,543 research outputs found
Effects of mechanically separated dairy cow slurry on grazing performance
No abstract available
Tree rules in probabilistic transition system specifications with negative and quantitative premises
Probabilistic transition system specifications (PTSSs) in the ntmufnu/ntmuxnu
format provide structural operational semantics for Segala-type systems that
exhibit both probabilistic and nondeterministic behavior and guarantee that
isimilarity is a congruence.Similar to the nondeterministic case of rule format
tyft/tyxt, we show that the well-foundedness requirement is unnecessary in the
probabilistic setting. To achieve this, we first define an extended version of
the ntmufnu/ntmuxnu format in which quantitative premises and conclusions
include nested convex combinations of distributions. This format also
guarantees that bisimilarity is a congruence. Then, for a given (possibly
non-well-founded) PTSS in the new format, we construct an equivalent
well-founded transition system consisting of only rules of the simpler
(well-founded) probabilistic ntree format. Furthermore, we develop a
proof-theoretic notion for these PTSSs that coincides with the existing
stratification-based meaning in case the PTSS is stratifiable. This continues
the line of research lifting structural operational semantic results from the
nondeterministic setting to systems with both probabilistic and
nondeterministic behavior.Comment: In Proceedings EXPRESS/SOS 2012, arXiv:1208.244
Efficient third harmonic generation in photonic nanowires
In a photonic nanowire the strong optical confinement allows for the phase matching of nonlinear interactions that would not normally be phase matched, while the large longitudinal component of the electric field serves to further enhance the effective nonlinearity. Thus such waveguides are good choices for studying nonlinear effects such as third harmonic generation. In this paper we analyse third harmonic generation analytically and present the criteria for optimal harmonic generation. In addition we analyse the inverse process of 1/3 harmonic generation and show that efficient parametric amplifiers can be made which would be a high brightness source of entangled photons for producing GHZ states
Role of interference in MM-wave driven DC transport in two dimensional electron gas
In this paper we point out that in addition to the density of states effect
proposed in Ref.\cite{durst,anderson} one should consider the effect of
constructive interference between the multi-MM-wave-photon processes shown in
Fig.2. This process enhances the dark value of the conductivity. When the
sample is very pure, i.e., when the transport life time is very long, this
interference effect quickly diminishes as the MM-wave frequency deviates from
the cyclotron frequency. In this paper we also present the linear response
theory in the presence of strong harmonic time-dependent perturbation
Storing unitary operators in quantum states
We present a scheme to store unitary operators with self-inverse generators
in quantum states and a general circuit to retrieve them with definite success
probability. The continuous variable of the operator is stored in a
single-qubit state and the information about the kind of the operator is stored
in classical states with finite dimension. The probability of successful
retrieval is always 1/2 irrespective of the kind of the operator, which is
proved to be maximum. In case of failure, the result can be corrected with
additional quantum states. The retrieving circuit is almost as simple as that
which handles only the single-qubit rotations and CNOT as the basic operations.
An interactive way to transfer quantum dynamics, that is, to distribute
naturally copy-protected programs for quantum computers is also presented using
this scheme.Comment: 4 pages, 3 figures, errors in Eq. (8) and Fig. 3 are fixed, to appear
in Phys. Rev.
Highly selective hydrogenation of furfural over supported Pt nanoparticles under mild conditions
The selective liquid phase hydrogenation of furfural to furfuryl alcohol over Pt nanoparticles supported on SiO₂, ZnO, γ-Al2O₃, CeO₂ is reported under extremely mild conditions. Ambient hydrogen pressure, and temperatures as low as 50 °C are shown sufficient to drive furfural hydrogenation with high conversion and >99% selectivity to furfuryl alcohol. Strong support and solvent dependencies are observed, with methanol and n-butanol proving excellent solvents for promoting high furfuryl alcohol yields over uniformly dispersed 4 nm Pt nanoparticles over MgO, CeO₂ and γ-Al₂O₃. In contrast, non-polar solvents conferred poor furfural conversion, while ethanol favored acetal by-product formation. Furfural selective hydrogenation can be tuned through controlling the oxide support, reaction solvent and temperature
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Never easy to say "sorry" : exploring the interplay of crisis involvement, brand image and message framing in developing effective crisis responses
textPlanning and executing a crisis response strategy that includes successful and effective communication with stakeholders are essential for companies, organizations and governments in order to maintain their reputations and sustain brands following a crisis. To determine the effectiveness of crisis response communication in terms of consumers’ evaluation and information processing, this study experimentally examined the impact of crisis involvement and brand image and interaction effect in a corporate product harm crisis. Using fictitious scenarios to manipulate crisis involvement, brand image, and message framing, this study examines the effect of crisis response strategies (i.e., apology) on post-crisis attitudes toward a crisis brand and apology message, future purchase intention, and intention to engage in negative eWOM. Specifically, the study attempts to identify whether the interplay between these factors would increase the effectiveness of a company’s crisis response regarding consumers’ favorable attitudes and behavioral intentions. The results of the present research showed that the overall three-way interaction between crisis involvement, brand image, and message framing is significant. First, in the case of high crisis involvement, the combination of rational framing and symbolic brand image increases the effectiveness of the apology message, while the combination of emotional framing of crisis communication and functional brand image increases the effectiveness of the apology message. In contrast, in the case of low crisis involvement, the combination of rational framing and functional brand image increases the effectiveness of the apology message, while the combination of emotional framing and symbolic brand image increases the effectiveness of the apology message. In addition, the study suggests that crisis involvement and brand image have a primary effect on the efficacy of the apology message from the crisis company in terms of attitude towards the crisis brand and purchase intention. The study has significant practical implications in that the results indicate that practitioners can alleviate the consequences suffered in a crisis by employing a crisis response strategy that properly aligns crisis type with level of involvement. Following a crisis, it is necessary to communicate with consumers using proper response messaging that takes into consideration consumers’ crisis involvement, brand image and message framing.Advertisin
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Perceptions of Korean and Korean-American mothers of children with autism : the impact of disability on the family and sibling relationships
The purpose of this study was to understand Korean and Korean-American mothers’ perspectives under cultural contexts in regard to the disability itself, family/sibling adjustment to the child with Autism Spectrum Disorder, and the support for those families. From in-depth interview, main themes are discovered that (a) resources & support, (b) sibling relationship, (c) family dynamics, and (d) cultural comparison. Practical implications for serving culturally and linguistically diverse families are discussed, and more future research on culturally and linguistically diverse family dynamics should be conducted.Special Educatio
Common gauge origin of discrete symmetries in observable sector and hidden sector
An extra Abelian gauge symmetry is motivated in many new physics models in
both supersymmetric and nonsupersymmetric cases. Such a new gauge symmetry may
interact with both the observable sector and the hidden sector. We
systematically investigate the most general residual discrete symmetries in
both sectors from a common Abelian gauge symmetry. Those discrete symmetries
can ensure the stability of the proton and the dark matter candidate. A hidden
sector dark matter candidate (lightest U-parity particle or LUP) interacts with
the standard model fields through the gauge boson Z', which may selectively
couple to quarks or leptons only. We make a comment on the implications of the
discrete symmetry and the leptonically coupling dark matter candidate, which
has been highlighted recently due to the possibility of the simultaneous
explanation of the DAMA and the PAMELA results. We also show how to construct
the most general U(1) charges for a given discrete symmetry, and discuss the
relation between the U(1) gauge symmetry and R-parity.Comment: Version to appear in JHE
Beyond the simple Proximity Force Approximation: geometrical effects on the non-retarded Casimir interaction
We study the geometrical corrections to the simple Proximity Force
Approximation for the non-retarded Casimir force. We present analytical results
for the force between objects of various shapes and substrates, and between
pairs of objects. We compare the results to those from more exact numerical
calculations. We treat spheres, spheroids, cylinders, cubes, cones, and wings;
the analytical PFA results together with the geometrical correction factors are
summarized in a table.Comment: 18 pages, 19 figures, 1 tabl
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