Results 21 to 30 of about 1,102,264 (299)

Establishment and Verification of Nonlinear Bolt Head Connection Stiffness Theoretical Model Based on Levenberg-Marquardt Method

open access: yesIEEE Access, 2020
Although some scholars have established the calculation method of bolt head connection characteristics, the method contains fewer influence factors; the calculation accuracy is not high, and the general applicability is limited.
Shikun Lu   +3 more
doaj   +1 more source

Laboratory Evaluation of Organic and Chemical Warm Mix Asphalt Technologies for SMA Asphalt

open access: yesThe Baltic Journal of Road and Bridge Engineering, 2012
Warm mix asphalt (WMA) technologies allow significant lowering of the production and paving temperature of the conventional hot mix asphalt (HMA), which promise various benefits, e.g. lowering the greenhouse gas emissions, reduction of energy consumption,
Martins Zaumanis   +4 more
doaj   +1 more source

3D Collagen-Nanocellulose Matrices Model the Tumour Microenvironment of Pancreatic Cancer

open access: yesFrontiers in Digital Health, 2021
Three-dimensional (3D) cancer models are invaluable tools designed to study tumour biology and new treatments. Pancreatic ductal adenocarcinoma (PDAC), one of the deadliest types of cancer, has been progressively explored with bioengineered 3D approaches
Rodrigo Curvello   +8 more
doaj   +1 more source

Arterial Stiffness [PDF]

open access: yesPulse, 2013
Stiffness of large arteries has been long recognized as a significant determinant of pulse pressure. However, it is only in recent decades, with the accumulation of longitudinal data from large and varied epidemiological studies of morbidity and mortality associated with cardiovascular disease, that it has emerged as an independent predictor of ...
openaire   +2 more sources

Holographic aberration correction: optimising the stiffness of an optical trap deep in the sample [PDF]

open access: yes, 2011
We investigate the effects of 1st order spherical aberration and defocus upon the stiffness of an optical trap tens of μm into the sample. We control both these aberrations with a spatial light modulator. The key to maintain optimum trap stiffness over a
Bowman   +22 more
core   +1 more source

Phonon abundance-stiffness-lifetime transition from the mode of heavy water to its confinement and hydration

open access: yes, 2018
A combination of the temporally and spatially resolved phonon spectroscopy has enabled calibration of hydrogen bond transition from the vibration mode of heavy water to the core/shelled nanodroplet and the subnanosized ionic hydration shell in terms of ...
Sun, Chang Q
core   +2 more sources

Estimation of the normal contact stiffness for frictional interface in sticking and sliding conditions [PDF]

open access: yes, 2019
Modeling of frictional contact systems with high accuracy needs the knowledge of several contact parameters, which are mainly related to the local phenomena at the contact interfaces and affect the complex dynamics of mechanical systems in a prominent ...
Baillet, L.   +4 more
core   +1 more source

P5.19 STIFF ARTERIES, STIFF HEARTS?

open access: yesArtery Research, 2013
Objectives: To examine the relationship between arterial stiffness and diastolic function in healthy normotensive subjects. Methods: For this study, 43 male (40±10 years) and 64 female (40±9 years) subjects were recruited. All were lifelong non-smokers, normolipidaemic, normoglycaemic and had normal 24-hour blood pressure responses (SBP\DBP <140\90).
O. Mac Ananey, V. Maher
openaire   +2 more sources

Jump performance and handgrip strength do not reflect acute fatigue in elite trail runners after the 2023 world trail running championship

open access: yesFrontiers in Sports and Active Living
PurposeFatigue manifests as a decline in maximal voluntary contraction (MVC), driven by both central and peripheral factors. Studies have shown reduced maximum isometric force in knee extensor and plantar flexor muscles after ultradistance trail running.
Diego Jaén-Carrillo   +7 more
doaj   +1 more source

Morphological and functional changes in the vertebral column with increasing aquatic adaptation in crocodylomorphs [PDF]

open access: yesRoyal Society Open Science, 2015
The lineage leading to modern Crocodylia has undergone dramatic evolutionary changes in morphology, ecology and locomotion over the past 200+ Myr. These functional innovations may be explained in part by morphological changes in the axial skeleton, which
Julia L. Molnar   +4 more
doaj   +1 more source

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