introduction left ventricular (lv) twist is believed to store potential energy and plays an important role in generating diastolic suction. recent advances in echocardiography techniques have allowed quantification of lv twist. the aim of the present study was to compare lv twist and torsion in healthy human subjects determined by velocity vector imaging (vvi) and tissue doppler imaging (tdi) a...

this work intends to deal with the optimal kinematic synthesis problem of tricept parallel manipulator. observing that cuboid workspaces are desirable for most machines, we use the concept of effective inscribed cuboid workspace, which reflects requirements on the workspace shape, volume and quality, simultaneously. the effectiveness of a workspace is characterized by the dexterity of the manip...

The load-induced deformations experienced by axial-flow rotor blades can result in significant hydrodynamic impacts on operation. These changes hydrodynamics are dominated the flapwise and twist deformation components, affecting blade loading performance. This work uses blade-resolved computational fluid dynamics simulations to explore interactions of coupled deformations, their potential for u...

We investigate the mechanisms of histone sliding and detachment with a stochastic model that couples thermally induced, passive histone sliding with active motor-driven histone unwrapping. Analysis of a passive loop or twist defect-mediated histone sliding mechanism shows that diffusional sliding is enhanced as larger portions of the DNA is peeled off the histone. The mean times to histone deta...

This work develops a morphing concept that utilises metamaterial as the passive device for helicopter blades. The metamaterials are created with bend–twist coupling, which enable blade twist under prescribed bending loads. Finite element analysis (FEA) is performed to investigate influence of unit cell configurations on coupling properties metamaterials. numerical models then validated experime...

The sensitivity of passive bacterial agglutination (PBA), i.e., the agglutination of Staphylococcus aureus coated with antibodies to hepatitis B surface antigen by hepatitis B surface antigen, was assessed by testing reference panel no. 3A sera (Bureau of Biologics, U.S. Food and Drug Administration). Of the 23 samples containing hepatitis B surface antigen, 18 were positive by PBA. Sera from 1...

We used QCD factorization for the hadronic matrix elements to show that the existing data, in particular the branching ratios BR ( ?J/?K) and BR ( ?J/??), can be accounted for this approach. We analyzed the decay within the framework of QCD factorization. We have complete calculation of the relevant hard-scattering kernels for twist-2 and twist-3. We calculated this decays in a special scale ...

Nelson MD, Haykowsky MJ, Petersen SR, DeLorey DS, Stickland MK, Cheng-Baron J, Thompson RB. Aerobic fitness does not influence the biventricular response to whole body passive heat stress. J Appl Physiol 109: 1545–1551, 2010. First published August 19, 2010; doi:10.1152/japplphysiol.00769.2010.—We examined biventricular function during passive heat stress in endurance trained (ET) and untrained...

The study presents an experimental and numerical evaluation of bend-twist elastic coupling in composite passive-adaptive structures. Due to the lack of experimental validation in Fluid Structure Interaction (FSI) investigations, a full-field deformation of an aerofoil-shaped section under wind loading is measured. The experimental analysis is carried out at the University of Southampton 3.5 m ×...

The purpose of this study is to describe a technical modification of percutaneous tracheostomy that combines principles of the Percu Twist™ and the Griggs-Portex® methods in a reusable kit. One hundred patients underwent the procedure. There were no false passage, tube misplacement, or deaths related to the procedure. There were two minor bleedings managed conservatively. The technical modifica...