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Critical submergence for a horizontal pipe intake
No full textIncipient air entrainment due to a free-surface vortex at a horizontal
pipe intake passing through a dead-end wall located in a channel is
investigated. Available potential flow based methods fail to predict the
critical submergence due to friction effects introduced by the dead-end
wall. In this study, velocity at the critical spherical sink surface,
which is an imaginary spherical surface having identical center and the
discharge as the intake, is associated with the average approach flow
velocity instead of assuming it as a constant as in the previous
studies. This simpler method for determination of critical submergence
is tested with available experimental data and the agreement is found to
be good. Scale effects are also discussed. It is shown that for the
similarity between the model and prototype horizontal intakes in terms
of air-entrainment, there is no need to consider Froude, Reynolds, and
Weber numbers similarities. (C) 2020 The Author. Published by Elsevier
B.V. on behalf of Faculty of Engineering, Ain Shams University
Histomorphometric evaluation of the effects of mandibular advancement appliance and low level laser therapy (LLLT) with different doses on condylar cartilage and subchondral bone in rats [Evaluación histomorfométrica de los efectos del aparato de avance mandibular y la terapia con láser de bajo nivel (TLBN) con diferentes dosis en cartílago condilar y hueso subcondral en ratas]
No full textComparative analysis and forecasting of COVID-19 cases in various European countries with ARIMA, NARNN and LSTM approaches
No full textIn this study, confirmed COVID-19 cases of Denmark, Belgium, Germany,
France, United Kingdom, Finland, Switzerland and Turkey were modeled
with Auto-Regressive Integrated Moving Average (ARIMA), Nonlinear
Autoregression Neural Network (NARNN) and Long-Short Term Memory (LSTM)
approaches. Six model performance metric were used to select the most
accurate model (MSE, PSNR, RMSE, NRMSE, MAPE and SMAPE). According to
the results of the first step of the study, LSTM was found the most
accurate model. In the second stage of the study, LSTM model was
provided to make predictions in a 14-day perspective that is yet to be
known. Results of the second step of the study shows that the total
cumulative case increase rate is expected to decrease slightly in many
countries. (C) 2020 Elsevier Ltd. All rights reserved
Simultaneous Estimation of Overall Score and Subscores Using MIRT, HO-IRT and Bi-factor Model on TIMSS Data
No full text
Strategies of management of deep spinal infection: from irrigation and debridement to vacuum-assisted closure treatment
No full textPostoperative surgical site problems (PSSPs) following spinal surgery
may lead to patient mortality, increased treatment costs and possible
recurrent medical interventions. Despite efforts to reduce spinal
surgery-related infection rates, complications are common and
significantly increased by patient comorbidities. Since PSSPs occur
regardless of deterrent measures, it is essential to distinguish the
related risk factors. Different treatment conventions for PSSPs, for
example, antibiotic treatment, debridement, soft tissue care and removal
of implants have been prescribed with blended outcomes. The utilization
of the wound vacuum-assisted closure (VAC) system has gained increasing
popularity in the management of deep wound infections after deformity
surgery