798 research outputs found
Nutrient Assimilation by Organisms on Artificial Reefs in a Fish Culture (Example of Hong Kong)
Optical spectroscopy of gan microcavities with thicknesses controlled using a plasma etch-back
The effect of an etch-back step to control the cavity length within GaN-based microcavities formed between two dielectric Bragg mirrors was investigated using photoluminescence and reflectivity. The structures are fabricated using a combination of a laser lift-off technique to separate epitaxial III-N layers from their sapphire substrates and electron-beam evaporation to deposit silica/zirconia multilayer mirrors. The photoluminescence measurements reveal cavity modes from both etched and nonetched microcavities. Similar cavity finesses are measured for 2.0 and 0.8 mm GaN cavities fabricated from the same wafer, indicating that the etchback has had little effect on the microcavity quality. For InGaN quantum well samples the etchback is shown to allow controllable reduction of the cavity length. Two etch steps of 100 nm are demonstrated with an accuracy of approximately 5%. The etchback, achieved using inductively coupled plasma and wet chemical etching, allows removal of the low-quality GaN nucleation layer, control of the cavity length, and modification of the surface resulting from lift-off
UNDERSTANDING THE DETERMINANTS OF BLOCKCHAIN ADOPTION IN SUPPLY CHAINS: AN EMPIRICAL STUDY IN CHINA
This study adopts affordance approach to understand how supply chain managers interpret the possible benefits that can be performed within blockchain-enabled supply chain applications. With a focus on governance efficiency improvement, the impacts of traceability and transparency affordance on uncertainty reduction were examined from the perspective of transaction cost theory in supply chain industry. Partial least squares â structural equation modelling (PLS-SEM) was used to analyze the data collected from 364 experienced supply chain managers in China. The results revealed that traceability affordance exerted significant impacts on environmental and trading partner uncertainty rather than transparency affordance, which in turn affected the adoption intention. This study contributes to the extant literature by embedding transaction cost in blockchain affordances. The findings are useful in guiding practitioners to improve blockchain system design for reducing uncertainties in supply chain environment, leading to a higher adoption rate of blockchain technology
Interleukin-2 receptor antagonist improves early post-transplant renal function: results from single center experience
Split Supersymmetry from Anomalous U(1)
We present a scenario wherein the anomalous U(1) D-term of string origin
triggers supersymmetry breaking and generates naturally a Split Supersymmetry
spectrum. When the gaugino and the Higgsino masses (which are of the same order
of magnitude) are set at the TeV scale, we find the scalar masses to be in the
range (10^6 - 10^8) GeV. The U(1) D-term provides a small expansion parameter
which we use to explain the mass and mixing hierarchies of quarks and leptons.
Explicit models utilizing exact results of N = 1 suersymmetric gauge theories
consistent with anomaly constraints, fermion mass hierarchy, and supersymmetry
breaking are presented.Comment: 20 pages in LaTeX, version published in NPH
Can the Zee Model Explain the Observed Neutrino Data?
The eigenvalues and mixing angles in the Zee model are investigated
parameter-independently. When we require |\Delta m^2_{12}/\Delta m^2_{23}| \ll
1 in order to understand the solar and atmospheric data simultaneously, the
only solution is one which gives bi-maximal mixing. It is pointed out that the
observed values \sin^2 2\theta_{solar} \simeq 0.66 in the MSW LMA solution
cannot be explained within the framework of the Zee model, because we derive a
severe constraint on the value of \sin^2 2 \theta_{solar}, \sin^2 2
\theta_{solar} \geq 1 -(1/16)(\Delta m^2_{solar}/\Delta m^2_{atm})^2.Comment: Latex file, 10 pages, 1 figure, explanations and references added,
typos corrected, to be published in Phys.Rev.
Electric charge quantization and the muon anomalous magnetic moment
We investigate some proposals to solve the electric charge quantization
puzzle, which simultaneously explain the recent measured deviation on the muon
anomalous magnetic moment. For this we assess extensions of the Electro-Weak
Standard Model spanning modifications on the scalar sector only. It is
interesting to verify that one can have modest extensions which easily account
for the solution for both problems.Comment: 20 pages, 1 figures, needs macro axodraw.st
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Key tea beverage values driving touristsâ memorable experiences: an empirical study in Hong Kong-style cafĂ© memorable experience
Purpose â Using consumption value theory, this study aims to examine the impact of touristsâ perceived
consumption value dimensions of tea beverages offered by Hong Kong (HK)-style cafeÂŽs, including taste
value, price value, health value and emotional value, on touristsâmemorable experience (ME), satisfaction
and revisit intention.
Design/methodology/approach â Using an online survey, this study collected 225 usable data from
tourists who had experience in visiting HK-style cafeÂŽs. Partial least squaresâstructural equation modelling
was used to examine the importance of touristsâ value dimensions, including taste value, price value,
health value and emotional value, on touristsâME, satisfaction and revisit intention.
Findings â The results revealed that taste value, price value, health value and emotional value are
significant predictors of touristsâ ME in HK-style cafeÂŽs, which in turn drive their satisfaction and revisit
intention.
Research limitations/implications â This study focusses on a single context: HK-style cafeÂŽs. Future
research may enhance the generalisability of the findings by replicating the model in other countries with
diverse cultures.
Practical implications â Tourism marketers may strengthen touristsâ ME, satisfaction and revisit
intention by promoting tea beverages as well as HK-style cafeÂŽs. Tourism marketers are recommended to
communicate taste value, price value, health value and emotional value of HK-style tea beverages, which
in turn encourages tourists to learn about the features of tea beverages. Subsequently, it drives touristsâ
ME and satisfaction, thereby strengthening their intention to revisit.
Originality/value â This study contributes to the tourism marketing literature by providing an
understanding of the role of tea beverage value in driving touristsâ ME, satisfaction and revisit intention.
By empirically testing a research model, this study confirms that specific consumption value elements of
tea beverages, namely, taste value, price value, health value and emotional value, are critical drivers in
driving touristsâME, satisfaction and revisit intention
Bimaximal Neutrino Mixings from Lopsided Mass Matrices
Current solar and atmospheric neutrino oscillation data seem to favor a
bimaximal pattern for neutrino mixings where the matrix elements U_{e2} and
U_{\mu 3} are of order one, while U_{e3} is much smaller. We show that such a
pattern can be obtained quite easily in theories with ``lopsided'' mass
matrices for the charged leptons and the down type quarks. A relation
connecting the solar and atmospheric neutrino mixing angles is derived,
\tan^2\theta_{atm} \simeq 1+ \tan^2\theta_{sol}, which predicts \sin^2
2\theta_{atm} \simeq 0.97 corresponding to the best fit LMA solution for solar
neutrinos. Predictive schemes in SO(10) realizing these ideas are presented. A
new class of SO(10) models with lopsided mass matrices is found which makes use
of an adjoint VEV along the I_{3R} direction, rather than the traditional B-L
direction.Comment: 12 pages in LaTeX, no figure
Top A_FB at the Tevatron vs. charge asymmetry at the LHC in chiral U(1) flavor models with flavored Higgs doublets
We consider the top forward-backward (FB) asymmetry at the Tevatron and top
charge asymmetry at the LHC within chiral U(1)^\prime models with
flavor-dependent U(1)^\prime charges and flavored Higgs fields, which were
introduced in the ref. [65]. The models could enhance not only the top
forward-backward asymmetry at Tevatron, but also the top charge asymmetry at
LHC, without too large same-sign top pair production rates. We identify
parameter spaces for the U(1)^\prime gauge boson and (pseudo)scalar Higgs
bosons where all the experimental data could be accommodated, including the
case with about 125 GeV Higgs boson, as suggested recently by ATLAS and CMS.Comment: 11 pages, 6 figures, figures and discussion adde
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