Results 61 to 70 of about 955,250 (214)

FRICTION LAWS FOR LONG WAVES ON A DRY BED

Doboku Gakkai Ronbunshu, 1988
Friction laws are obtained through hydraulic experiments on long waves running up on a dry bed. In the experiments, a bottom-running channel is used to yields a stationary wave and the water particle velocity is measured with an LDV. Similarity laws are found in the distributions of velocity and Reynolds stresses in the bottom boundary layer.
Koji FUJIMA, Nobuo SHUTO
openaire   +2 more sources

Ladder‐Type Benzene‐Perylene Dyes with Efficient Laser Properties in the Near‐IR by Detracting/Activating Low/High Frequency Vibronic Modes

Advanced Functional Materials, EarlyView.
The NNR‐n series of oligomeric nanographenes delivers exceptional emission performance. This work shows that this performance is originated by their ladder‐type structure, which effectively deactivates low‐frequency vibronic modes. This deactivation neglects the main pathway for non‐emissive deactivation, even in the near‐infrared region. The potential
Marcos Díaz‐Fernández, Álex Farrando Pérez, Fernando Gordillo Gámez, Pedro G. Boj, José M. Villalvilla, José A. Quintana, Yanpei Wan, Daniel Aranda, José Manuel Marín‐Beloqui, Jishan Wu, Zebing Zeng, María A. Díaz‐García, Juan Casado   +12 more
wiley   +1 more source

Experimental Study on Pore Structure Evolution of Unloaded Rock Mass during Excavation of Reservoir Slope under Dry–Wet Cycle

Applied Sciences
There is a long sequence of periodic characteristics of reservoir water storage and discharge in large hydropower stations. The unloaded rock mass formed by blasting and excavation in the reservoir slope of the reservoir fluctuation zone is not only ...
Lili Chen, Xingzhou Chen, Sheng Gong, Zhenhan Li, Zhenkun Su   +4 more
doaj   +1 more source

Bridges in three-dimensional granular packings: experiments and simulations

, 2013
In this letter, we present the first experimental study of bridge structures in three-dimensional dry granular packings. When bridges are small, they are predominantly 'linear', and have an exponential size distribution.
Barker, G. C., Cao, Yixin, Chakrabortty, Bandan, Mehta, Anita, Wang, Yujie   +4 more
core   +1 more source

Laser‐Induced Graphene from Waste Almond Shells

Advanced Functional Materials, EarlyView.
Almond shells, an abundant agricultural by‐product, are repurposed to create a fully bioderived almond shell/chitosan composite (ASC) degradable in soil. ASC is converted into laser‐induced graphene (LIG) by laser scribing and proposed as a substrate for transient electronics.
Yulia Steksova, Anna Chiara Bressi, Marina Galliani, Attilio Marino, Gianni Ciofani, Eduardo Machado‐Charry, Hilda Gomez Bernal, Alessandra Francini, Luca Sebastiani, Francesco Greco   +9 more
wiley   +1 more source

Modelling the transition from grain-boundary sliding to power-law creep in dry snow densification

Journal of Glaciology, 2022
This paper presents a physics-based macroscale model for the densification of dry snow which provides for a smooth transition between densification by grain-boundary sliding (stage 1) and densification by power-law creep (stage 2).
Elizabeth M. Morris, Lynn N. Montgomery, Robert Mulvaney   +2 more
doaj   +1 more source

Ab-initio friction forces on the nanoscale: A DFT study of fcc Cu(111)

, 2014
While there are a number of models that tackle the problem of calculating friction forces on the atomic level, providing a completely parameter-free approach remains a challenge.
Feldbauer, Gregor, Mohn, Peter, Redinger, Josef, Vernes, András, Wolloch, Michael   +4 more
core   +2 more sources

Biomimetic Iridescent Skin: Robust Prototissues Spontaneously Assembled from Photonic Protocells

Advanced Functional Materials, EarlyView.
Uniform nanoparticles are induced to form arrays (photonic crystals) in the cores of biopolymer capsules, endowing these ‘protocells’ with structural color. These protocells are then assembled into large self‐standing objects, i.e., prototissues, with robust mechanical properties as well as iridescent optical properties.
Medha Rath, Briahnah Streeter, Satyam Srivastava, Jemma Wood, William E. Bentley, Taylor J. Woehl, Srinivasa R. Raghavan   +6 more
wiley   +1 more source

Dynamic buckling and fragmentation in brittle rods

, 2004
We present experiments on the dynamic buckling and fragmentation of slender rods axially impacted by a projectile. By combining the results of Saint-Venant and elastic beam theory, we derive a preferred wavelength lambda for the buckling instability, and
A. Belmonte, A. N. Kolmogorov, B. Hopkinson, D. B. Dingwell, D. W. Thompson, E. Villermaux, E. A. H. Love, H. E. Lindberg, J. R. Gladden, M. Ekevad, N. Jones, N. Z. Handzy, N. F. Mott, S. Redner, S. Vogel, T. Ishii, W. Goldsmith, W. J. Stronge   +17 more
core   +3 more sources

MOFs and COFs in Electronics: Bridging the Gap between Intrinsic Properties and Measured Performance

Advanced Functional Materials, EarlyView.
Metal‐organic frameworks (MOFs) and covalent organic frameworks (COFs) hold promise for advanced electronics. However, discrepancies in reported electrical conductivities highlight the importance of measurement methodologies. This review explores intrinsic charge transport mechanisms and extrinsic factors influencing performance, and critically ...
Jonas F. Pöhls, R. Thomas Weitz
wiley   +1 more source