721 research outputs found
Further improvement of fluidized bed models by incorporating zone method with Aspen Plus interface
While providing a fast and accurate tool of simulating fluidized beds, the major limitation of classical zero-dimensional ideal reactor models used in process simulators, such as models built into commercial software (e.g. Aspen Plus®), has been the difficulties of involving thermal reciprocity between each reactor model and incorporating heat absorption by the water wall and super-heaters which is usually specified as model inputs rather than predicted by the models themselves. This aspect is of particular importance to the geometry design and evaluation of operating conditions and flexibility of fluidized beds. This paper proposes a novel modelling approach to resolve this limitation by incorporating an external model that marries the advantages of zone method and Aspen Plus in a robust manner. The improved model has a relatively modest computing demand and hence may be incorporated feasibly into dynamic simulations of a whole power plant
Perturbative Scattering Phase Shifts in One-Dimension: Closed-form Results
A simple closed form expression is obtained for the scattering phase shift
perturbatively to any given order in effective one-dimensional problems. The
result is a hierarchical scheme, expressible in quadratures, requiring only
knowledge of the zeroth order solution and the perturbation potential.Comment: 10 pages in REVTe
Privacy Requirements for mobile e-Service in the Health Authority-Abu Dhabi (HAAD)
© 2016 Infonomics Society. The Health Authority-Abu Dhabi (HAAD) mobile e-Service is a smartphone or smart device installed with the HAAD mobile app. This connects to one or more e-services at the HAAD Cloud to facilitate healthcare services for the residents at the Emirate of Abu Dhabi in the United Arab Emirates (UAE). A mobile device in this context can be effectively considered Internet of Things (IoT), which can provide advanced online services to both healthcare provider and requestor under the control and monitor of the HAAD. Health information is among the most sensitive information of an individual that can be collected and shared. The information that needs to be protected in the healthcare sector is often referred to as Protected Health Information (PHI). Service providers with a good reputation for privacy protection will find it easier to build a trusted relationship with their users. The Health Insurance Portability and Accountability Act of 1996 (HIPAA) defines a set of security and privacy rules to be followed by healthcare providers in the United States of America. The HIPAA standards are designed for protecting health information. This paper discusses related privacy requirements for Mobile e-Service at the HAAD in accordance with the HIPAA privacy requirements
Latent profile analysis of the physical self-description among Chinese Adolescents
The purposes of this study were to validate the Physical Self-Description Questionnaire (PSDQ-S) and examine the physical self-description profiles using Latent Profile Analysis with a Chinese sample. A total of 744 secondary school students in China took part in the study. While the results provided support for internal
reliability and discriminant validity of the PSDQ-S, they indicated convergent validity
required further testing. In addition, three distinct profiles were identified with unique
physical self-concept and different levels of physical activity participation. The study
showed the PDSQ-S is useful in differentiating groups of adolescents with different levels of physical self-concept
Unique epidemiological patterns of human infections with H7N9 avian influenza virus discovered by combined risk factor surveillance and epidemiology
Background: An outbreak of a novel human avian influenza (H7N9) [h-H7N9 AI] took place in China from February 2013 to April 2015, with 628 reported cases. However, there were no exact answers on epidemiological patterns and its origin. Purpose: To examine the epidemiological patterns and its origin compared with other influenza outbreaks by combined analysis of risk factor surveillance and epidemiological characteristics, and to explore new surveillance methods for tracking infectious disease outbreaks
Ground state of a polydisperse electrorheological solid: Beyond the dipole approximation
The ground state of an electrorheological (ER) fluid has been studied based
on our recently proposed dipole-induced dipole (DID) model. We obtained an
analytic expression of the interaction between chains of particles which are of
the same or different dielectric constants. The effects of dielectric constants
on the structure formation in monodisperse and polydisperse electrorheological
fluids are studied in a wide range of dielectric contrasts between the
particles and the base fluid. Our results showed that the established
body-centered tetragonal ground state in monodisperse ER fluids may become
unstable due to a polydispersity in the particle dielectric constants. While
our results agree with that of the fully multipole theory, the DID model is
much simpler, which offers a basis for computer simulations in polydisperse ER
fluids.Comment: Accepted for publications by Phys. Rev.
Selecting Resort Locations
[[abstract]]This study examines a comprehensive and objective three-stage method for selecting resort location in Taiwan that maximize competitive advantage. The factors and criteria used in the evaluation model are obtained from an exhaustive literature review and interviews with 16 experts. In the first stage, for which the modified Delphi method is used to identify the evaluation criteria, a survey is performed to rank the relative importance of the 22 criteria identified in the interviews. In the second stage, 19 experts evaluate potential resort locations using a subjective multi-criteria model, the analytical hierarchy process (AHP). The analytical results yield rankings of resorts of the following types: casino resorts, seaside resorts, health/spa resorts and lakeside resorts. In the final stage, a sensitivity analysis is performed to clarify the strength of the various influences on resort selection. The analytical results are used to develop and examine a potential solution.[[journaltype]]國外[[incitationindex]]SSCI[[booktype]]紙本[[countrycodes]]GB
On the single mode approximation in spinor-1 atomic condensate
We investigate the validity conditions of the single mode approximation (SMA)
in spinor-1 atomic condensate when effects due to residual magnetic fields are
negligible. For atomic interactions of the ferromagnetic type, the SMA is shown
to be exact, with a mode function different from what is commonly used.
However, the quantitative deviation is small under current experimental
conditions (for Rb atoms). For anti-ferromagnetic interactions, we find
that the SMA becomes invalid in general. The differences among the mean field
mode functions for the three spin components are shown to depend strongly on
the system magnetization. Our results can be important for studies of beyond
mean field quantum correlations, such as fragmentation, spin squeezing, and
multi-partite entanglement.Comment: Revised, newly found analytic proof adde
Size-dependent Correlation Effects in Ultrafast Optical Dynamics of Metal Nanoparticles
We study the role of collective surface excitations in the electron
relaxation in small metal particles. We show that the dynamically screened
electron-electron interaction in a nanoparticle contains a size-dependent
correction induced by the surface. This leads to new channels of quasiparticle
scattering accompanied by the emission of surface collective excitations. We
calculate the energy and temperature dependence of the corresponding rates,
which depend strongly on the nanoparticle size. We show that the
surface-plasmon-mediated scattering rate of a conduction electron increases
with energy, in contrast to that mediated by a bulk plasmon. In noble-metal
particles, we find that the dipole collective excitations (surface plasmons)
mediate a resonant scattering of d-holes to the conduction band. We study the
role of the latter effect in the ultrafast optical dynamics of small
nanoparticles and show that, with decreasing nanoparticle size, it leads to a
drastic change in the differential absorption lineshape and a strong frequency
dependence of the relaxation near the surface plasmon resonance. The
experimental implications of our results in ultrafast pump-probe spectroscopy
are also discussed.Comment: 29 pages including 6 figure
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