1,678 research outputs found
Arabic Spelling Correction using Supervised Learning
In this work, we address the problem of spelling correction in the Arabic
language utilizing the new corpus provided by QALB (Qatar Arabic Language Bank)
project which is an annotated corpus of sentences with errors and their
corrections. The corpus contains edit, add before, split, merge, add after,
move and other error types. We are concerned with the first four error types as
they contribute more than 90% of the spelling errors in the corpus. The
proposed system has many models to address each error type on its own and then
integrating all the models to provide an efficient and robust system that
achieves an overall recall of 0.59, precision of 0.58 and F1 score of 0.58
including all the error types on the development set. Our system participated
in the QALB 2014 shared task "Automatic Arabic Error Correction" and achieved
an F1 score of 0.6, earning the sixth place out of nine participants.Comment: System description paper that is submitted in the EMNLP 2014
conference shared task "Automatic Arabic Error Correction" (Mohit et al.,
2014) in the Arabic NLP workshop. 6 page
Structural changes in lipid-free humic acids during composting of sewage sludge
Structural changes in humic acids (HAs), extracted after lipid removal from sewage sludge during composting, were investigated using various chemical methods (elemental analysis, Fourier transform infrared spectroscopy and 13C-nuclear magnetic resonance
(NMR) spectroscopy). Compared to non-purified HAs, lipid-free HAs (LFHAs) exhibit higher C and N contents and high absorbance around 1652, 1540 and 1230 cm1, which indicates the intensity of the etherified aromatic structures and nitrogencontaining components. Less absorbance around 2920, 1600, 1414 and 1100 cm1 could be assigned to their low level of aliphatic
compounds, mainly those with a carboxyl group. According to 13C-NMR spectroscopy, almost 45% of aliphatic structures are
removed by lipid extraction and these correspond mainly to long-chain fatty acids. During composting, significant decomposition of non-substituted alkyl structures and N-containing components occurred, increasing the relative intensity of etherified aromatic structures
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