Counterfactual statements describe events that did not or cannot take place. We consider the problem of counterfactual detection (CFD) in product reviews. For this purpose, we annotate a multilingual CFD dataset from Amazon product reviews covering c
ounterfactual statements written in English, German, and Japanese languages. The dataset is unique as it contains counterfactuals in multiple languages, covers a new application area of e-commerce reviews, and provides high quality professional annotations. We train CFD models using different text representation methods and classifiers. We find that these models are robust against the selectional biases introduced due to cue phrase-based sentence selection. Moreover, our CFD dataset is compatible with prior datasets and can be merged to learn accurate CFD models. Applying machine translation on English counterfactual examples to create multilingual data performs poorly, demonstrating the language-specificity of this problem, which has been ignored so far.
This research showed a study of the aerodynamic characteristics
including the turbulent wake behind a twisted overhead
transmission line in comparison to the wake behind a cylindrical
transmission line. The study showed the effect of the shape of
the
twisted transmitter on the slow pattern and the boundary layer
separation and the shape of the wake. A difference was noted
between the two transmitters and especially the pressure distribution
and the resulting force. The study also dealt with the noise caused
by the flow; the twisted transmitter showed higher sound pressure
levels SPL compared to the cylindrical transmitter. This is due to
the boundary layer separation.
The aerodynamic performance of an airfoil of the shape NACA
4415 was investigated using CFD numerical analysis.
The study of the phenomenon of ship squat in vessels can be considered as one of the
most important topics in ships hydrodynamic science, because it is related to the marine
secure, especially now after the rapid increase in size of vessels and ope
ration speeds. In
literatures there are methods that are used to predict ship squat.
This research aims to develop a 3D Numerical Modeling to analyze the phenomenon
of ship squat of the ship in Canals using computational numerical method and proper
software, to extract the velocity and pressure fields of the flow around ship hull. The last
one affect directly this phenomenon.
To build a 3D model and to represent ship squat for viscous flow, simulation has
been developed using Gambit and Ansys Fluent programs.
ship squat has been integrating the motion of water level drop. The effect of vessel
speed and blockage factor Cb have been taken into account.
Results confirm the efficiency of the CFD for simulating ship squat. The comparison
with other experimental and computational methods show good accuracy.
This research aims to check the actual performance of the work of the propeller
depending on series of results issued from Hamburg basins that are known by RANSE
where the arcs analysis and the hydrodynamic characteristics of the propeller work in
open
water are done by using the commercial program CFD Analysis m by Hydro Comp.
Thus, the results were compared with the experimental data and the study of fluently
around the different parts of the ship and the definition of resistance values and friction
factor CF. These values were compared with those issued by ITTC basins and coincidence
was found between those of RANSE and the experimental values in the different stages of
study.
Therefore, a collection of solutions related to the work of propeller were achieved in
addition to the evaluation of the level of interaction and the exchanged effect of the
propeller work in different conditions, and the definition of degree of difference resulted
from the values of the rotation moment and the factors of advance and control the are
resulted from the use of CFD program. The numerical results and the syntheses data were
discussed in case of working in open water.
