Results 121 to 130 of about 368,669 (336)
Resonance in Bottles with Different Shapes
International Scholastic Journal of Science, 2012 The Helmholtz Resonance equation derived in the 1800’s describes the nature of resonance in narrow-necked vessels, known as Helmholtz Resonators.
Amy Elliott
doaj
The Ophthalmoscope: Helmholtz’s Augenspiegel [PDF]
European Neurology, 2009 The origins of Helmholtz’s invention of the ophthalmoscope are found in the ancient observation that the back of the eye appeared black. In 1703, Jean Méry reported that the luminosity of the cat’s eye could be seen when the animal was held under water, and Mariotte observed that a dog’s eye was luminous but erroneously thought this was because its ...
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Physical Review Letters, 2018 Secondary flux ropes are suggested to play important roles in energy dissipation and particle acceleration during magnetic reconnection. However, their generation mechanism is not fully understood. In this Letter, we present the first direct evidence that
Z. Zhong +11 more
semanticscholar +1 more source
Advanced Functional Materials, EarlyView.Polymorph engineering in ErMnO3 enables low‐voltage, forming‐free threshold switching with tunable negative differential resistance. Conducting orthorhombic regions embedded in an insulating hexagonal matrix provide controlled Joule‐heating‐enhanced Poole–Frenkel transport. The hexagonal phase prevents excessive heating and breakdown.
Rong Wu +8 more
wiley +1 more source
Advanced Functional Materials, EarlyView.ABSTRACT Electronic waste has emerged as a major environmental challenge, driven by the massive consumption and a limited lifetime of modern electronic devices, stimulating the development of sustainable electronics. Here, an all‐biomaterial gelatin‐choline‐citric acid ([Ch][CA]) ionogel is developed as an active binder to realize self‐sintered ...
Lin Guo +10 more
wiley +1 more source
AIP Advances, 2019 We describe an acoustic impedance matching method that permits perfect sound transmission between waveguides of different impedances as set by their cross sectional areas.
William M. Robertson +2 more
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Scientific Reports, 2017 In this article, a dual-band wide-angle metamaterial perfect absorber is proposed to achieve absorption at the wavelength where laser radar operates.
Changlei Zhang +6 more
semanticscholar +1 more source
Electrolyte Design Strategies for Static Shuttle‐Free and Long‐Life Aqueous Zinc‐Iodine Batteries
Advanced Functional Materials, EarlyView.This review systematically summarizes recent advances in electrolyte design for static aqueous Zn‐I2 batteries, highlighting solvation regulation and interfacial engineering strategies to control reaction kinetics, suppress iodine shuttling, enhance energy density, and stabilize multi‐electron iodine redox chemistry for durable, high‐performance energy
Qianqin Zhou +3 more
wiley +1 more source
Hydrodynamical instability of extragalactic stratified jets [PDF]
, 1997 The recent development of tomographic analysis of radio data shows the presence of sheaths around several extragalactic jets. We have studied the Kelvin-Helmholtz instability of such stratified jets, describing them as inner relativistic beams embedded ...
Hanasz, M., Sol, H.
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The Helmholtz Metadata Collaboration – FAIR data for Helmholtz
In late 2019, the Helmholtz Association of German Research Centres – as being the largest research organization in Germany involving 18 autonomous centres and more than 43,000 employees working across six research fields – launched the Helmholtz Metadata Collaboration (HMC) platform.
Curdt, Constanze +2 more
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