Background: Brain tissue segmentation for delineation of 3D anatomical structures from magnetic resonance (MR) images can be used for neuro-degenerative disorders, characterizing morphological differences between subjects based on volumetric analysis of gray matter (GM), white matter (WM) and cerebrospinal fluid (CSF), but only if the obtained segmentation results are correct. Due to image arti...

The Sirri jacket offshore platform was designed and installed in Persian gulf of Iran in 1975 and has been in service since that time. The importance of offshore structure's stability and the failure of this kind of structure during an earthquake in different active zones revealed that earthquake loading has to be considered. In this paper, Magnetorheological (MR) fluid dampers have been propos...

resistance exercise is associated with increased oxidative stress. however, it is not completely obvious how resistance training intensity can affect the rest levels of oxidative stress indexes. therefore, the aim of the present research was to study the effect of moderate resistance (mr) and high resistance (hr) training on oxidative stress. 20 males (age: 20.6±0.7 yr, height: 1.74±0.06 m, wei...

In this study the catalytic dehydrogenation of ethylbenzene to styrene was investigated in a simulated tubular sodalite membrane reactor. The high quality microporous sodalite membrane was synthesized by direct hydrothermal method and characterized by single gas permeation measurements. The performance of the prepared membrane showed high potential for application in a dehydrogenation membrane ...

In this study, montmorillonite (MMT) modified by a cationic surfactant (Hexadecyltrimethyl ammonium bromide, HDTMA) was used as adsorbent to the removal of methyl red (MR) from aqueous solution. The effect of different parameters includes surfactant loading rate, contact time, pH, adsorbent dosage, and initial MR content was investigated on the sorption. The sorption capacity was increased by i...

damping of a full-scale cable with a pair of passive–on magnetorheological (mr) dampers was tested. a cable of 215.58m long with the first mode frequency of 0.658hz was tensioned horizontally in cable prefabrication factory. two mr dampers were attached to the cable in an angle in the plane perpendicularly to the cable axis in 5m length from the cable anchorage. the applied voltage level was 0v...

conclusions our results have shown that indirect mr arthrography had greater diagnostic accuracy in regards to the sensitivity, specificity, and positive and negative predictive values than conventional mri in knee pathologies. results in all of the pathologies studied, the sensitivity, specificity, and the positive and negative predictive values were evaluated. a high rate of accuracy was foun...

two new potential magnetic resonance imaging contrast agents, gd-hematoporphyrin (gd-h) and gd-tetra-carboranylmethoxyphenyl-porphyrin (gd tcp), were synthesized and applied to nude mice with human melanoma (mm 138) xenografts. these agents showed a high relaxivity because of their greater potential to coordinate water molecules. the reduction of t1 relaxation times of 16 and 21% was observed i...

Göç, paralel metasezgisel optimizasyon algoritmalarının başarılı sonuçlar üretmesini sağlayan başlıca işlem adımıdır. Göç parametreleri olan göç oranı (MR) ve aralığının (MI) doğru olarak belirlenmesi algoritmanın başarısını etkiler. Bu nedenle parametrelerinin değerlerinin üzerine yapılacak çalışmalar önemlidir. çalışmada, MR MI değerleri, yanıt yüzeyi yöntemlerinden biri merkezi kompozit tasa...