Direct Mechanical Measurements Reveal the Material Properties of Three-Dimensional DNA Origami

Abstract The objective of this study was to quantify pavement damage due to a conventional (385/65R22.5) and a new generation of wide-base (445/50R22.5) tires using three-dimensional (3D) finite element (FE) analysis. The investigated new generation of wide-base tires has wider treads and greater load-carrying capacity than the conventional wide-base tire. In addition, the contact patch is less sensitive to loading and is especially designed to operate at 690kPa inflation pressure at 121km/hr speed for full load of 151kN tandem axle. The developed FE models simulated the tread sizes and applicable contact pressure for each tread and utilized laboratory-measured pavement material properties. In addition, the models were calibrated and properly validated using field-measured stresses and strains. Comparison was established between the two wide-base tire types and the dual-tire assembly. Results indicated that the 445/50R22.5 wide-base tire would cause more fatigue damage, approximately the same rutting damage and less surface-initiated top-down cracking than the conventional dual-tire assembly. On the other hand, the conventional 385/65R22.5 wide-base tire, which was introduced more than two decades ago, caused the most damage.

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Study on improving three-dimensional dynamic simulation model and equation of flexible fabric

Advances in Mechanical Engineering ◽

10.1177/1687814019852842 ◽

2019 ◽

Vol 11 (6) ◽

pp. 168781401985284

Author(s):

Meiliang Wang ◽

Mingjun Wang ◽

Xiaobo Li

Keyword(s):

Simulation Model ◽

Dynamic Simulation ◽

Material Properties ◽

Three Dimensional ◽

Equation Solving ◽

Study Results ◽

Essential Properties ◽

Dynamic Simulation Model ◽

Novel Model ◽

Simulation Equation

The use of the traditional fabric simulation model evidently shows that it cannot accurately reflect the material properties of the real fabric. This is against the background that the simulation result is artificial or an imitation, which leads to a low simulation equation. In order to solve such problems from occurring, there is need for a novel model that is designed to enhance the essential properties required for a flexible fabric, the simulation effect of the fabric, and the efficiency of simulation equation solving. Therefore, the improvement study results will offer a meaningful and practical understanding within the field of garment automation design, three-dimensional animation, virtual fitting to mention but a few.

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Picosecond time-resolved photon antibunching measures nanoscale exciton motion and the true number of chromophores

Nature Communications ◽

10.1038/s41467-021-21474-z ◽

2021 ◽

Vol 12 (1) ◽

Author(s):

Gordon J. Hedley ◽

Tim Schröder ◽

Florian Steiner ◽

Theresa Eder ◽

Felix J. Hofmann ◽

...

Keyword(s):

Rational Design ◽

Three Dimensional ◽

Dna Origami ◽

Fluorescent Nanoparticles ◽

Time Resolved ◽

Exciton Diffusion ◽

Polymer Aggregates ◽

True Number ◽

Particle Level ◽

Photon Antibunching

AbstractThe particle-like nature of light becomes evident in the photon statistics of fluorescence from single quantum systems as photon antibunching. In multichromophoric systems, exciton diffusion and subsequent annihilation occurs. These processes also yield photon antibunching but cannot be interpreted reliably. Here we develop picosecond time-resolved antibunching to identify and decode such processes. We use this method to measure the true number of chromophores on well-defined multichromophoric DNA-origami structures, and precisely determine the distance-dependent rates of annihilation between excitons. Further, this allows us to measure exciton diffusion in mesoscopic H- and J-type conjugated-polymer aggregates. We distinguish between one-dimensional intra-chain and three-dimensional inter-chain exciton diffusion at different times after excitation and determine the disorder-dependent diffusion lengths. Our method provides a powerful lens through which excitons can be studied at the single-particle level, enabling the rational design of improved excitonic probes such as ultra-bright fluorescent nanoparticles and materials for optoelectronic devices.

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The Effect of Material Properties on the Perceived Shape of Three-Dimensional Objects

i-Perception ◽

10.1177/2041669520982317 ◽

2020 ◽

Vol 11 (6) ◽

pp. 204166952098231

Author(s):

Masakazu Ohara ◽

Juno Kim ◽

Kowa Koida

Keyword(s):

Material Properties ◽

Regional Variation ◽

Three Dimensional ◽

Mean Square ◽

Viewing Condition ◽

Three Dimensional Objects ◽

Transparent Objects ◽

Dimensional Shape ◽

Local Root ◽

Three Dimensional Shape

Perceiving the shape of three-dimensional objects is essential for interacting with them in daily life. If objects are constructed from different materials, can the human visual system accurately estimate their three-dimensional shape? We varied the thickness, motion, opacity, and specularity of globally convex objects rendered in a photorealistic environment. These objects were presented under either dynamic or static viewing condition. Observers rated the overall convexity of these objects along the depth axis. Our results show that observers perceived solid transparent objects as flatter than the same objects rendered with opaque reflectance properties. Regional variation in local root-mean-square image contrast was shown to provide information that is predictive of perceived surface convexity.

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Mechanics of Composite Layered Rough Medium in Contact

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.703.200 ◽

2013 ◽

Vol 703 ◽

pp. 200-203

Author(s):

Shao Biao Cai ◽

Yong Li Zhao

Keyword(s):

Material Properties ◽

Three Dimensional ◽

Shear Stresses ◽

Normal Loading ◽

Layered Coatings ◽

Pressure Profiles ◽

Tangential Traction ◽

Von Mises ◽

Von Mises Stresses ◽

Tangential Friction

This study presents a first attempt to develop a numerical three-dimensional multilayered (more than 2 composite layered coatings) elasticperfectly plastic rough solids model to investigate the contact behavior under combined normal loading and tangential traction. Contact analyses are performed to study the effects composite thin film layers. Local contact pressure profiles, von Mises stresses, and shear stresses as a function of material properties and applied normal and tangential friction loads are calculated.

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On the Design of a Biodegradable POC-HA Polymeric Cardiovascular Stent

Volume 2: Biomedical and Biotechnology ◽

10.1115/imece2012-88703 ◽

2012 ◽

Cited By ~ 3

Author(s):

Joonas Ponkala ◽

Mohsin Rizwan ◽

Panos S. Shiakolas

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Material Properties ◽

Three Dimensional ◽

Polymeric Composite ◽

Coronary Stent ◽

Element Analysis ◽

Material Models ◽

Solid Models ◽

Biodegradable Stents

The current state of the art in coronary stent technology, tubular structures used to keep the lumen open, is mainly populated by metallic stents coated with certain drugs to increase biocompatibility, even though experimental biodegradable stents have appeared in the horizon. Biodegradable polymeric stent design necessitates accurate characterization of time dependent polymer material properties and mechanical behavior for analysis and optimization. This manuscript presents the process for evaluating material properties for biodegradable biocompatible polymeric composite poly(diol citrate) hydroxyapatite (POC-HA), approaches for identifying material models and three dimensional solid models for finite element analysis and fabrication of a stent. The developed material models were utilized in a nonlinear finite element analysis to evaluate the suitability of the POC-HA material for coronary stent application. In addition, the advantages of using femtosecond laser machining to fabricate the POC-HA stent are discussed showing a machined stent. The methodology presented with additional steps can be applied in the development of a biocompatible and biodegradable polymeric stents.

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Ansätze zur verbesserten Umformung von Papier*/Approaches to improved forming of paper

wt Werkstattstechnik online ◽

10.37544/1436-4980-2017-10-36 ◽

2017 ◽

Vol 107 (10) ◽

pp. 714-718

Author(s):

P. Prof. Groche ◽

W. Franke ◽

A. Ackermann

Keyword(s):

Life Cycle Assessment ◽

Life Cycle ◽

Material Properties ◽

Anisotropic Material ◽

Three Dimensional ◽

Size Accuracy ◽

Packaging Industry ◽

Industry Sectors

Ein breiterer Einsatz von Papier könnte sich auf die Umweltbilanz zahlreicher Branchen zum Beispiel der Verpackungsindustrie positiv auswirken. Allerdings stehen der Umsetzung zahlreiche Herausforderungen im Wege. Bei der umformtechnischen Herstellung dreidimensionaler Produkte aus Papier erfordern insbesondere die anisotropen Werkstoffeigenschaften geeignete Maßnahmen. Dieser Fachbeitrag zeigt, wie durch gezielte, lokal angepasste Werkzeugtemperierung die Maßhaltigkeit der Produkte zu verbessern ist.   A broad use of paper could improve the life cycle assessment of industry sectors like the packaging industry. However, there are many obstacles to the application. Especially the anisotropic material properties need suitable measures to the forming manufacturing of three-dimensional products made of paper. This article presents how to improve the size accuracy of products made of paper by the use of targeted, locally heated tools.

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