نتایج جستجو برای: discrete torsional and lateral bracing

تعداد نتایج: 16869351  

Journal: :the journal of tehran university heart center 0
zahra ojaghi-haghighi echocardiography research center, rajaei cardiovascular, medical and research center, iran university of medical sciences, tehran, iran. atoosa mostafavi echocardiography research center, shariati medical and research center, tehran university of medical sciences, tehran, iran. hassan moladoust cardiovascular research center, guilan university of medical sciences, rasht, iran. feridoun noohi echocardiography research center, rajaei cardiovascular, medical and research center, iran university of medical sciences, tehran, iran. majid maleki echocardiography research center, rajaei cardiovascular, medical and research center, iran university of medical sciences, tehran, iran. maryam esmaeilzadeh echocardiography research center, rajaei cardiovascular, medical and research center, iran university of medical sciences, tehran, iran.

background: left ventricular (lv) twist is due to oppositely directed apical and basal rotation and has been proposed as a sensitive marker of lv function. we sought to assess the impact of chronic pure mitral regurgitation (mr) on the torsional mechanics of the left human ventricle using tissue doppler imaging. methods: nineteen severe mr patients with a normal lv ejection fraction and 16 non-...

Journal: :The Review of scientific instruments 2008
Hui Xie Julien Vitard Sinan Haliyo Stéphane Régnier

A novel method that uses a small mechanical lever has been developed to directly calibrate the lateral sensitivity of the optical lever in the atomic force microscope (AFM). The mechanical lever can convert the translation into a nanoscale rotation angle with a flexible hinge that provides an accurate conversion between the photodiode voltage output and torsional angle of a cantilever. During t...

2010
J. A. Packer

cast connections. ABSTRACT: Diagonal bracings are extremely popular elements for lateral load resistance in steel-framed buildings. In turn, the most common shape used for bracing members is the hollow structural section. While the design of such members is straight-forward, the design of gusset-plate connections at the member ends is controversial. This paper reviews the current ‘state-of-the-...

Journal: :Journal of Structural and Construction Engineering (Transactions of AIJ) 1997

Adding steel braces to reinforced concrete frames is a common way for seismic rehabilitation of these structures. Due to ease of installation and the possibility of creating openings in the braced bays, this method of rehabilitation has been more preferred than using shear walls. In this paper, three experimental specimens including a reinforced concrete frame, a reinforced concrete frame with ...

Journal: :Revista espanola de cirugia ortopedica y traumatologia 2014
S García David J A Cortijo Martínez I Navarro Bermúdez F Maculé P Hinarejos L Puig-Verdié J C Monllau J A Hernández Hermoso

The keel design of the tibial tray is essential for the transmission of the majority of the forces to the peripheral bone structures, which have better mechanical proprieties, thus reducing the risk of loosening. The aim of the present study was to compare the behaviour of different tibial tray designs submitted to torsional forces. Four different tibial components were modelled. The 3-D recons...

Frahad Sajajid, Reza Nosouhi, Yahya Radi Najafabadi

A hybrid longitudinal-torsional ultrasonic transducer is designed and fabricated in this research. The design of the transducer was performed using the FE method with ABAQUS software, with the aim of combining the longitudinal and torsional vibration modes. The transducer horn is then fabricated using a 4-axis milling machine. The PZT stacks are employed in order to excite the transducer. The t...

Journal: :Foot & ankle international 2013
Tobin T Eckel Richard R Glisson Prashanth Anand Selene G Parekh

BACKGROUND Displaced lateral malleolar fractures are often treated with reduction and surgical stabilization. However, there has not been a comprehensive laboratory comparison to determine the most appropriate device for treating these patients. This study subjected a range of contemporary lateral fibular plates to a series of mechanical tests designed to reveal performance differences. METHO...

The energy absorption of concrete filled, hollow-steel bracing was analyzed respect to geometric and mechanical parameters including the width-to-thickness section ratio, slenderness level, and strength of the steel and concrete. Local buckling and ductility were also investigated with respect to variation in the cross-section. The infill increased the compression resistance, even after multipl...

Journal: :Journal of structural engineering. B 2023

The present study presents a new FEM element for buckling analysis of members H-section and its application to spatial structures. is fundamentally composed three parallel beams together with two struts normal the elements, enabling consideration flexural-torsional buckling. study, first, performs static under torsional moments. Second, subjected axial forces, followed by lateral bending moment...

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