2,163 research outputs found
Droplet migration: quantitative comparisons with experiment
An important practical feature of simulating droplet migration computationally,
using the lubrication approach coupled to a disjoining pressure term, is
the need to specify the thickness, H, of a thin energetically stable wetting layer,
or precursor lm, over the entire substrate. The necessity that H be small in
order to improve the accuracy of predicted droplet migration speeds, allied to the
need for mesh resolution of the same order as H near wetting lines, increases the
computational demands signicantly. To date no systematic investigation of these
requirements on the quantitative agreement between prediction and experimental
observation has been reported. Accordingly, this paper combines highly ecient
Multigrid methods for solving the associated lubrication equations with a parallel
computing framework, to explore the eect of H and mesh resolution. The solutions
generated are compared with recent experimentally determined migration
speeds for droplet
ows down an inclined plane
Characterization of interfacial strength of syntactic foam by unit cell finite element model
The interfacial strength between glass hollow microspheres and epoxy in epoxy-based syntactic foam was investigated using finite element method. The stiffness of the foam in tension and compression was studied by unit cell type finite element model containing a microsphere and an epoxy matrix. The changes in the stiffness of the foams having different interfacial strength were analyzed by introducing interfacial elements between the microsphere and the matrix in the model. The tension and compression moduli of the foam was studied by the model, in terms of the stiffness of the interfacial elements. Finally, the moduli of the foam having different volume fractions of the microspheres were evaluated by experiments and compared to the results of the model to characterize the interfacial strength between the microsphere and the matrix.
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Noise reduction of plenum windows on the façade of a high-rise residential building next to heavy road traffic
Extensive traffic noise transmission loss measurements were carried out inside selected residential units of a standalone 32-storey housing block located next to a very busy and noisy main trunk road in the present study. A total of 35 units, which were all equipped with plenum windows, was surveyed. These plenum windows are intended to help reduce noise exposure of the residents and at the same time allow for a reasonable level of natural ventilation. The results show that the traffic noise transmission losses of the unit façades installed with the plenum windows adopted in this housing block vary between 10.6 and 13.0 dBA and are only weakly dependent on elevation from the trunk road. The results also validate in-situ the prediction model established previously by the authors using laboratory and site mockup data. Generalized models for both empirical and experimental estimation of the traffic noise transmission loss across a residential flat unit façade installed with multiple plenum windows are developed. The differences between their estimations are well within engineering tolerance
Decay rate and renormalized frequency shift of a quantum wire Wannier exciton in a planar microcavity
The superradiant decay rate and frequency shift of a Wannier exciton in a
one-dimensional quantum wire are studied. It is shown that the dark mode
exciton can be examined experimentally when the quantum wire is embedded in a
planar microcavity. It is also found that the decay rate is greatly enhanced as
the cavity length is equal to the multiple wavelength of the emitted
photon. Similar to its decay rate counterpart, the frequency shift also shows
discontinuities at resonant modes.Comment: 12 pages, 2 figures. To appear in P. R. B. September 200
The Efficacy of Influenza Vaccination of Elderly: Population-Based Influenza Vaccination Program in Taiwan during 1998–2006
ARCHERY TRAINING IMPROVE POSTURAL CONTROL IN YOUNG CHILDREN
Exercise training might be beneficial for postural control (PC) during exercise and daily activities. The purpose of the study was to examine the effects of an eight-week archery training program on PC in young children during the standard, aiming, and archery shooting standing posture
Electrified thin film flow at finite Reynolds number on planar substrates featuring topography
The flow of a gravity-driven thin liquid film over a substrate containing topography, in the presence of a normal electric field, is investigated. The liquid is assumed to be a perfect conductor and the air above it a perfect dielectric. Of particular interest is the interplay between inertia, for finite values of the Reynolds number, Re, and electric field strength, expressed in terms of the Weber number, We, on the resultant free-surface disturbance away from planarity. The hydrodynamics of the film are modelled via a depth-averaged form of the Navier–Stokes equations which is coupled to a Fourier series separable solution of Laplace’s equation for the electric potential: detailed steady-state solutions of the coupled equation set are obtained numerically. The case of two-dimensional flow over different forms of discrete and periodically varying spanwise topography is explored. In the case of the familiar free-surface capillary peaks and depressions that arise for steep topography, and become more pronounced with increasing Re, greater electric field strength affects them differently. In particular, it is found that for topography heights commensurate with the long-wave approximation: (i) the capillary ridge associated with a step-down topography at first increases before decreasing, both monotonically, with increasing We and (ii) the free-surface hump which arises at a step-up topography continues to increase monotonically with increasing We, the increase achieved being smaller the larger the value of Re. A series of results for the more practically relevant problem of three-dimensional film flow over substrate containing a localised square trench topography is provided. These exhibit behaviour and features consistent with those observed for two-dimensional flow, in that as We is increased the primary free-surface capillary ridges and depressions are at first enhanced, with a corresponding narrowing, before becoming suppressed. In addition, it is found that, while the well-known horse-shoe shaped disturbance characteristic of such flows continues to persist with increasing Re in the absence of an electric field, when the latter is present and We increased in value the associated comet tail disappears as does the related downstream surge. The phenomenon is explained with reference to the competition between the corresponding capillary pressure and Maxwell stress distributions
PO-0698: Integration of radiotherapy to chemotherapy for abdominal lymph node recurrence in gastric cancer
Design and Development of Deep Learning Convolutional Neural Network on an Field Programmable Gate Array
This paper presents the design and development of Convolutional Neural Network on Field Programmable Gate Array. In the recent work of deep learning Convolutional Neural Network, CNN is a challenging research area in both software and hardware implementation. Software implementations tend to be prohibitively slow considering that most of the neural networks run on sequentially operation architecture. Thus, the objective of this work is to design and develop deep learning CNN on FPGA based on the premise that hardware implementations that perform parallel computation of each neuron in the layers can be made faster. This work focuses on handwriting recognition where the machine has the ability to receive and interpret intelligible handwritten input from the sources. The speed of the CNN implemented on an FPGA was analyzed. Digits and numbers were successfully recognized by the developed system
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