circularly-polarized antenna is built based on new siw(substrate integrated waveguide)structure which contains cavity-backed resonator and a conventional polarized ring with twosquare slits in inner and outer ring that differ 90° at position and is proposed for right-handedcircular polarization (rhcp) and fabricated in two separate layers. a broadband impedancebandwidth of 13.9% and a rhcp axia...

myeloid sarcoma (ms) is a tumor mass consisting of myeloblast with or without maturation occurring at an anatomical site other than the bone marrow. incidence of ms ranges from 1-9% and is most commonly misdiagnosed as non hodgkins lymphoma or poorly differentiated carcinoma. ms can occur in various sites but nasal cavity involvement is rare. here we report acaseof ms presenting as nasal polyp ...

there are significant structural differences between the mouth and pharyngeal cavity of birds and mammals. it is usual to refer to a common oropharyngeal cavity of birds because the soft palate, which forms such an obvious delineation between the mouth and pharyngeal cavity, is absent. six male adult ostriches were used to study the oropharyngeal cavity and its components including the beak, ha...

background: mullerian disorders are present in 5-25% of infertile women. myoma, polyp and endometrial adhesions are among other involved factors in infertility. objective: the aim of this study was to determine the frequency distribution of pregnancy occurrence in infertile women after the diagnostic-surgical hysteroscopy on selected infertile cases including those with abnormal uterine. materi...

objective: various techniques of composite placement have been used to decrease microleakage around the composite restorations. due to controversial results, the present study was conducted to investigate the effect of different placement techniques on microleakage in class v composite restorations. materials and methods: sixty class v cavities were prepared on the buccal and lingual surfaces o...

in design of defense structures, concrete are often used to provide protection against incidental dynamic loadings such as the impact of a steel projectile. in the present study, a new analytical model is proposed to predict penetration depth into concrete targets by ogive nose projectile. hence, to ­ develop the model and simulate penetration of high velocity ogive-shape nose steel projectiles...

introduction: knowledge of the anatomic location and dimension of the molar pulp chamber may preserve healthy pulp during operative procedure and reduce risk of perforation of chamber during access preparation. a review of literatures regarding the morphology of pulp chamber however revealed very little information; so the aim of this in vivo study was to measure the dimensions of first molar p...

background and aims. a correct diagnosis is the most important step in the treatment of oral lesions and each oral lesion has specific clinical features that provide clinical diagnosis; however, some of these features are common among different lesions. in these situations, biopsy and histopathological examination are indicated. the aim of this study was to evaluate the relationship between cli...

background and objective: different mechanisms may lead to the development of soft tissue tumor-like lesions in the oral cavity. many of these lesions can be identified as specific entities on the basis of their histopathological features and are divided into fibrous, vascular, and giant cell types. the purpose of this study was to establish the relative prevalence of the different histopatholo...

introduction: peripheral reactive lesions of soft tissue are common oral lesions that dentists face during routine examinations. diagnosis and development of a treatment plan is difficult if dentists are not aware of the prevalence and clinical symptoms of these lesions. the frequency of these lesions differs across various populations. the aim of this study was to determine the frequency and d...