Asphalt mastic, which consists of an asphalt binder and a mineral filler, provides critical adhesion viscoelasticity to mixture. The rheological response the mastic is mainly derived from its binder. In this study, simple laboratory test method proposed estimate relationship mastic. Two modified binders (3.5% 4.0% styrene–butadiene–styrene (SBS) by mass) were blended with limestone filler at si...

Average left ventricular (LV) chamber stiffness (Delta P(avg)/Delta V(avg)) is an important diastolic function index. An E-wave-based determination of Delta P(avg)/Delta V(avg) (Little WC, Ohno M, Kitzman DW, Thomas JD, Cheng CP. Circulation 92: 1933-1939, 1995) predicted that deceleration time (DT) determines stiffness as follows: Delta P(avg)/Delta V(avg) = N(pi/DT)(2) (where N is constant), ...

This work investigates the effects of ironing process on physical properties material extruded polylactic acid (PLA). Polylactic is an exceedingly popular biodegradable polymer commonly used in extrusion 3D printing. As a promising alternative to petroleum based polymers, PLA has found use medical, textile, and packaging industries due its biocompatibility, renewability, good mechanical propert...

In the field of motor control, two hypotheses have been controversial: whether the brain acquires internal models that generate accurate motor commands, or whether the brain avoids this by using the viscoelasticity of musculoskeletal system. Recent observations on relatively low stiffness during trained movements support the existence of internal models. However, no study has revealed the decre...

The problem of transient propagation in a homogeneous linear viscoelastic solid is investigated by means of the wave splitting technique. Two mechanical viscoelastic models are considered in particular, corresponding respectively to a single Maxwell element and to the series of a Maxwell element plus a Kelvin element. Analytical solutions for the split field are evaluated in terms of the wave p...

This study reports the first direct, high-resolution physical and structural evidence of wall changes during hyphal tip growth, visualized by atomic force microscopy (AFM) in Aspergillus nidulans. Images from AFM and cryo-scanning electron microscopy provided comparable information, but AFM was also able to image and physically probe living cells. AFM images showed changes in the surface ultras...

Successful completion of development requires coordination of patterning events with morphogenetic movements. Environmental variability challenges this coordination. For example, developing organisms encounter varying environmental temperatures that can strongly influence developmental rates. We hypothesized that the mechanics of morphogenesis would have to be finely adjusted to allow for norma...

BACKGROUND Climacteric skin aging affects certain biophysical characteristics of facial skin. The purpose of the present study was to assess the symmetric involvement of the cheeks in this stage of the aging process. METHODS Skin viscoelasticity was compared on both cheeks in premenopausal and post-menopausal women with indoor occupational activities somewhat limiting the influence of chronic...

Cerebral magnetic resonance elastography (MRE) measures the viscoelastic properties of brain tissues in vivo. It was recently shown that brain viscoelasticity is reduced in patients with multiple sclerosis (MS), highlighting the potential of cerebral MRE to detect tissue pathology during neuroinflammation. To further investigate the relationship between inflammation and brain viscoelasticity, w...

OBJECTIVE The aim of the present study was to investigate the efficacy of two frequently used physiotherapies (PTs) for the removal of bronchial secretions in cystic fibrosis (CF) lung disease: autogenic drainage (AD) and the Flutter (Desitin in Germany). AD is believed to improve mucus clearance from peripheral to central airways due to airway caliber changes in combination with a special brea...