DNA A-tracts have been defined as four or more consecutive A.T base pairs without a TpA step. When inserted in phase with the DNA helical repeat, bending is manifested macroscopically as anomalous migration on polyacrylamide gels, first observed >20 years ago. An unsolved conundrum is why DNA containing in-phase A-tract repeats of A(4)T(4) are bent, whereas T(4)A(4) is straight. We have determi...

BACKGROUND Measurement of the bending stiffness a healing fracture represents a valid variable in the assessment of fracture healing. However, currently available methods typically have high measurement errors, even for mild pin loosening. Furthermore, these methods cannot provide actual values of bending stiffness, which precludes comparisons among individual fractures. Thus, even today, littl...

Bending of thin sheets or ribbons is a ubiquitous phenomenon that impacts our daily lives, from the household thermostat to sensors in airbags. At nanometer-scale thicknesses, the mechanics responsible for bending and other distortions in sheets can be employed to create a nanofabrication approach leading to novel nanostructures. The process and resulting structures have been aptly referred to ...

The inherent stability of two-dimensional motion when hovering using beating wings that have a passive feathering is compared with rotary flapping motion. the determined by bending elasticity, which expressed spring at wing root. torsional damper and values were minimizing necessary power in present analysis. Unlike motion, do not pitch/roll damping. A flying robot requires quicker flight contr...

This work presents improved technology for attaining high-quality rolled metal strip. The new technology is based on an innovative method to model both the static and dynamic characteristics of rolling mill deflection, and it applies equally to both cluster-type and non cluster-type rolling mill configurations. By effectively combining numerical Finite Element Analysis (FEA) with analytical sol...

The present paper is devoted to fracture analysis of an inhomogeneous non-linear elastic beam configuration with three parallel longitudinal cracks. material continuously along the height. subjected four-point bending. behavior studied by applying J-integral approach. Solutions are obtained for For this purpose, curvature and coordinates neutral axes crack arms determined using equations equili...

The peak strain (PS) of sheet metal highly affects the process design and quality roll formed product. Different from traditional forming technology (RFT) that all cross section contours product are rolled simultaneously, a symmetric RFT is developed with respect to corrugated channels avoid defects like tearing, twist, redundant deformations. behaviors their strains subsequently simulated fini...

Phase-field fracture simulations have been established to simulate crack propagation in solid structures. The method employs a variational framework which has proven converge Griffith' classical model for brittle fracture. Here we investigate the predictiveness of phase-field through four-point bending test mixed mode condition, and discuss possibilities perform such simulation with finite elem...