In active control of seismic structures, force capacity and time delay of the actuators are generally a restriction in the performance because of using high control forces for big mechanical systems like buildings. Although, a time delay value and a control force limit are considered in the tuning of the controllers, these factors may change according to physical conditions. For that reason, ro...

The present paper studies the heating of coronal loops by linear resonant Alfvén waves that are excited by the motions of the photospheric footpoints of the magnetic field lines. The analysis is restricted to torsionally polarised footpoint motions in an axially symmetric system so that only torsional Alfvénwaves are excited. For this subclass of footpointmotions, the Alfvén and cusp singularit...

A 45-year-old woman presented with acute vertigo and a vertical gaze palsy. Examination with Frenzel goggles showed that during vertical saccades the eyes were torsionally deviating to the left (counterclockwise from the patient’s point of view) and slowly returned to the initial zero torsion after the saccade (video on the Neurology Web site at www.neurology. org; figure 1). This eye movement ...

The chiral nature of DNA plays a crucial role in cellular processes. Here we use magnetic tweezers to explore one of the signatures of this chirality, the coupling between stretch and twist deformations. We show that the extension of a stretched DNA molecule increases linearly by 0.42 nm per excess turn applied to the double helix. This result contradicts the intuition that DNA should lengthen ...

We report here the first resonance Raman results of octopus hypsorhodopsin, a species formed photochemically at very low temperatures from visual pigments. A pump-probe technique was used to obtain Raman spectra from samples at 12 degrees K whose photostationary state mixtures were either hypsorhodopsin rich or hysorhodopsin poor. The data strongly suggest that the Schiff-base linkage between t...

• Simplified building model for seismic assessment using dynamic analyses. Model suitable non-shear-type buildings as it accounts beams flexibility. Torsional behaviour of irregular accurately captured. Remarkable reduction computational time. Validation on a 3D reinforced concrete moment resisting frame building. Seismic safety assessments at the large-scale are paramount importance densely ur...

An elastic model for double-stranded polymers is constructed to study the recently observed DNA entropic elasticity, cooperative extensibility, and supercoiling property. With the introduction of a new structural parameter (the folding angle w), bending deformations of sugar-phosphate backbones, steric effects of nucleotide base pairs, and base-stacking interactions are considered. The comprehe...