Results 131 to 140 of about 5,117 (217)

Public health spending, old-age productivity and economic growth: chaotic cycles under perfect foresight

open access: yes
This paper analyses the dynamics of a double Cobb-Douglas economy with overlapping generations and public health investments that affect the supply of efficient labour of the old-aged.
Gori, Luca, Fanti, Luciano
core  

Plasma Stability in Turbulent Magnetic Flux Ropes Downstream of a Collisionless Shock

open access: yesGeophysical Research Letters, Volume 53, Issue 11, 16 June 2026.
Abstract How pre‐existing solar wind turbulence, and coherent structures such as magnetic flux ropes within it, influence the transition of plasma across a shock is still poorly understood. Recently, in situ observations from the Earth's magnetosheath have been used to study plasma stability against ion kinetic instabilities. In the turbulent flow, the
L. Vuorinen   +3 more
wiley   +1 more source

Geometry Analysis of Two Photon Polymerized Microneedles—An Experimental and Simulated Approach

open access: yesJournal of Applied Polymer Science, Volume 143, Issue 22, June 10, 2026.
This research investigates the mechanical stability of hollow, two‐photon‐polymerized microneedles for drug delivery. In an experimental setup, a steel stamp gradually compresses 1000 μm‐tall microneedles while recording their force–deformation response.
Cordelia F. Wittemann   +4 more
wiley   +1 more source

A New Threshold Switching Device With Tunable Negative Differential Resistance Based on ErMnO3 Polymorphs

open access: yesAdvanced Functional Materials, Volume 36, Issue 44, 1 June 2026.
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

Light‐Induced Entropy for Secure Vision

open access: yesAdvanced Materials, Volume 38, Issue 33, 12 June 2026.
This work realized a ternary true random number generator by exploiting stochastic traps emerging within multiple junction interfaces, and quantitatively validated the generation of high‐quality random numbers. Furthermore, it successfully demonstrated diverse applications, including AI‐resilient image security, thereby providing a valuable guide for ...
Juhyung Seo   +9 more
wiley   +1 more source

NMDA receptor kinetics drive distinct routes to chaotic firing in pyramidal neurons. [PDF]

open access: yesFront Comput Neurosci
Borjkhani M   +4 more
europepmc   +1 more source

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