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Showing 1 to 20 of 244 for “"Stiffening"”.
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Optimum column stiffening
Thesis (M.S.) Massachusetts Institute of Technology. Dept. of Civil and Sanitary Engineering, 1950.
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Chemical amplification in self-stiffening materials
Self-healing and self-stiffening materials represent bio-inspired materials which can recover and even improve their properties after a damage event ideally without human intervention. These materials are able to utilize a neutral or even harmful environmental stimulus generated in the damage event …
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Damping and stiffening forces of a squeeze-film between two plates
… studies. Our goal, however, is to quantify the stiffening effect, which affects the resonance frequency of the squeeze film and oscillator system. In this research, the finite difference method for rectangular geometries is applied to solve the nonlinear isothermal Reynold's equation for the …
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Ultrasonic wave reflection measurements on stiffening and setting of cement paste
… ultrasonic wave reflection (UWR) to monitor stiffening and setting of portland cement paste. The research focuses especially on the very early hydration period, during the first hours after mixing. For such purpose, it is necessary to obtain higher measurement sensitivity, in this case by …
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Inelastic seismic behavior of stiffening systems : multi-span simply-supported (MSSS) bridges
Stiffening behavior can result from interaction between a structure (base system) and its surrounding environment as in the MSSS bridge soil-structure interaction. In this study, three MSSS bridge cases are parametrically analyzed and their dynamic characteristics and behavior are presented and …
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Using Dynamic Rheology to Explore the Microstructure and Stiffening of Cementitious Mixtures
… and the exponents are approximately the same. Stiffening of cement paste in the first hour appears to be due to increase in ionic strength by hydration.
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Elastic stiffening in PVA-Borax studied with experimental medium amplitude oscillatory shear
… we seek to understand the mechanisms of strain-stiffening and shear-thickening often observed in transient or associative polymer hydrogels; specifically, Poly(vinyl) alcohol (PVA) crosslinked with Sodium tetraborate (Borax), or PVA-Borax. We use medium amplitude oscillatory shear (MAOS) as a …
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Mechanisms of Western-Diet Induced Endothelial Stiffening: Endothelial CD36 and Long-Chain Fatty Acids
… WD-associated cardiovascular dysfunction: stiffening (an increase in the elastic modulus) of the aortic endothelial layer associates with barrier disruption, and both are mediated by endothelial scavenger lipid receptor CD36. Through the use of an inducible, endothelial-specific CD36 …
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Slamming analysis of skips in mine shafts: the effect of secondary stiffening in the guides
… work by investigating the effect of secondary stiffening, due to axial tension effects as the guide deforms, on the slamming response of the skip. A mathematical model of a single slamming event is formulated and a numerical solution procedure presented. A number of computer simulations, …
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Design and Characterization of a Nonlinear Stiffening Spring for a Series-Elastic Ankle-Foot Prosthesis
… design and characterization of a nonlinear stiffening spring, which acts as the elastic element of a powered transtibial prosthesis with cycloidal drive transmission. A mathematical model for angular deflection of the spring wrapping around a cylindrical surface was created, and …
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Effect of Centrifugal Stiffening on the Natural Frequencies of Aircraft Wings During Rapid Roll Maneuvers
… studies explain the effect of centrifugal stiffening in rotating beams and consequently on the frequencies of the beam. Multiple cases of the rotating beam are explored in this thesis to investigate effects of mass distribution and boundary conditions on the frequencies of centrifugally …
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The adaption of powdered starch solutions for the stiffening of dark cottons with selected construction features
The suitability of powdered starch with borax or glycerine accessories for dark cottons of three different colors and weights and with selected construction gestures was ascertained. Selected colors, weights, and construction features were evaluated by analysis of variance for their effect on the …
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Intermittent Standing and Prior Exercise as Strategies to Prevent Arterial Stiffening That Can Arise From Prolonged Sitting
… mechanistic links between sitting and aortic stiffening and experiment with other strategies.</p>
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A Comparison of the Bending Moments, Shears and Deflections for Suspension Bridges With Continuous and Two-Hinged Stiffening Trusses
Made available in DSpace on 2014-12-05T17:37:01Z (GMT). No. of bitstreams: 1 5900549.pdf: 7140341 bytes, checksum: 186f15407336d450de52e97e2bdfa3e2 (MD5) Previous issue date: 1958
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Dynamics of multi-body space interferometers including reaction wheel gyroscopic stiffening effects : structurally connected and electromagnetic formation of flying architectures
Space telescopes have the potential to revolutionize astronomy and our search for life-supporting planets beyond our Solar System. Free of atmospheric distortions, they are able to provide a much "clearer" view of the universe than ground-based telescopes. A developing technology that appears …
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Feasibility of helically stiffened construction for a formula racing car structural shell
… torsional stiffness is obtained with helical stiffening. For circular cross-section shells with the cockpit cutout and reinforcements usually present in real racing car structural shells, ±4S' helically stiffened shells are 200% stiffer in torsion than sandwich shells. For square cross-section …
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Thermal Evolution of MAS, YSZ and GZO Thermal Barrier Coating Materials in Benign and CMAS Rich Environments
… vulnerabilities, such as sintering induced stiffening, phase transformations, and susceptibility to molten siliceous debris. This study investigates the potential of magnesia-alumina spinel (MAS) as an alternative top coat material for TBCs due to its superior resistance to sintering and …
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Enzymatic crosslinking of dynamic hydrogels for in vitro cell culture
Stiffening and softening of extracellular matrix (ECM) are critical processes governing many aspects of biological processes. The most common practice used to investigate these processes is seeding cells on two-dimensional (2D) surfaces of varying stiffness. In recent years, cell-laden …
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