نتایج جستجو برای: cavity expansion

تعداد نتایج: 218601  

Journal: :international journal of advanced design and manufacturing technology 0
ahmad reza khoogar assistant professor, department of mechanical engineering, maleke-ashtar university of technology, tehran, iran. mohamad ali mohades ms student, malek ashtar university of technology, tehran‎. khodadad vahedi department of mechanical and aerospace engineering,‎ imam hosain university‎.

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...

ژورنال: مجله دندانپزشکی 2009
امینی, فریبرز, رمضانی, غلام حسین,

Background and Aim: In treatment of posterior crossbite awareness of the effects of Haas and Hyrax rapid maxillary expanders (RME) on nasal cavity will help the clinician to select the better appliance. This study was carried out to compare the effects of Haas and Hyrax expanders on the nasal cavity of patients treated for posterior crossbite. Materials and Methods: A clinical trial study was ...

2017
Xiaochao Jin Huawei Yang Xueling Fan Zhihua Wang Xuefeng Shu

The cavity expansion theory is most widely used to predict the depth of penetration of concrete targets. The main purpose of this work is to clarify the differences between the spherical and cylindrical cavity expansion models and their scope of application in predicting the penetration depths of concrete targets. The factors that influence the dynamic cavity expansion process of concrete mater...

Journal: :Canadian Geotechnical Journal 2006

Journal: :Brazilian journal of otorhinolaryngology 2008
Tatiana Ramires Roberto Alcântara Maia José Roberto Barone

UNLABELLED Mandibular cross-sectional deficiency is a dentofacial defect in connection with the narrowing of the mandibular arch width. This abnormality is a significant etiopathogenic factor and it is often associated with nasal breathing difficulties. This atresia may be treated through Rapid Maxillary Expansion or Surgically Assisted Rapid Maxillary Expansion, depending on the patient's age....

2001

LLE Review, Volume 85 15 Introduction Fused silica (SiO2) exhibits some unique features when it is ground or polished. It also densifies permanently under large compressive stresses at room temperature;1–3 up to 15% permanent densification has been observed.2,3 The experimental data for densification from different works, however, are obviously inconsistent,4 which may result from different lev...

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