This paper presents a new assessment of four approaches to acoustic echo cancellation in the presence of non-linear echo. The comparison is performed with algorithms that are configured to give equivalent performance under linear-only echo conditions, thereby giving a more meaningful assessment. We also compare the effect of non-linear echo to that of noise and show that, whilst performance dif...

in this paper the risk of heavy metals discharged from the acidic sludge leachate into groundwater in a landfill located in fajr industrial area )garmsar( has been assessed using iwem software. acidic sludge as one of the industrial hazardous wastes is produced during purification of used oil with mienken )acidic( method. the concentrations of heavy metals )cd, ni, co, pb, zn, mn, cu( in the ac...

purposes: the aim of this study was to evaluate the intra and inter-examiner reliability and reproducibility of linear measurements in cone-beam tomography (cbct) images taken by calibrated radiologists and periodontists. materials and methods: the alveolar ridge dimensions in selected cbct images were measured by two calibrated radiologists and two periodontists. intra and inter-examiner relia...

collaboration is a central aspect of research, with variable impact on research output and quality. its assessment is commonly based on citation count, but this is an inadequate measure in biomedical research. the aim of this preliminary study is to determine the impact of collaboration at three levels on the quality of dental therapy research using a valid and reliable instrument. ninety-nine ...

recently, two of the authors have introduced the collapse capacity spectrummethodology, which allows the assessment of the collapse capacity of highly inelastic p-deltasensitive regular frame structures without performing non-linear time-history analyses. the mainingredient of this method is the collapse capacity spectrum, which represents the seismic collapsecapacity of an inelastic non-deteri...

several factors effect on sorption of polycyclic aromatic hydrocarbons (pahs) in soil. co-existence of metals and organic matter of soil are among important affecting factors on sorptive behavior of pahs. this research investigated the effect of organic matter content and heavy metals (lead, nickel and zinc), on sorption of phenanthrene onto kaolinite. for this purpose, sorption of the organic ...

objectives: self-assessment, as one type of alternative assessment, with the increased attention to learner-centered curricula, needs analysis, and learner autonomy has gained popularity in recent years. the aim of this study was to investigate the effect of self-assessment on javanroodian foreign language (kordestan) learners’ oral performance ability. methods: the assessment program involved ...