The connection of the Callen-Welton and Nyquist fluctuation-dissipation relations is considered for plasma-like classical and quantum systems. The conditions for appearance of the dissipative parameters in the equilibrium current-current correlatio...
What Is the Nyquist Theorem? The Nyquist theorem, also known as the Nyquist–Shannon sampling theorem, defines the conditions under which a continuous-time signal can be sampled and perfectly …
We show that under very mild conditions on a measure $μ$ on the interval $[0,\infty)$, the span of $\{x^k\}_{k=n}^{\infty}$ is dense in $L^2(μ)$ for any $n=0,1,\ldots$. We present two different proofs of this result, one based on the density index...
We investigate the matched product of solutions associated with right and left shelves. First, we prove that the requirements to provide the matched product of solutions that come from shelves can be simplified. Then we give conditions for left non-d...
Almost any rod and reel heavier than a light spinning outfit is suitable for striped bass fishing. The lighter the tackle, the greater the sport, of course. Under certain conditions, however, fairly heavy tackle is …
Jan 19, 2026 · For a life-threatening emergency, call 9-1-1. Emergency departments provide care to those who are the most sick or have critical, life-threatening health conditions first. For more …
This note discusses the initial and boundary conditions as well as the size of the computational domain for the double Mach reflection problem when set up as a test for the resolution of an Euler scheme for gas dynamics....
We present some novel results indicating that time's description in present-day physics is deficient. We use Hawking's information-erasure hypothesis to counter his own claim that time's arrow depends only on initial conditions. Next, we propose qu...
Significant progress has been made towards laser-driven fusion ignition via different schemes, including direct and indirect central ignition, fast ignition, shock ignition, and impact ignition schemes. However, to reach ignition conditions, there ar...
A proof of the main theorem of the Galois theory is presented using the main theorem of symmetric polynomials. The idea originated from studying the "Mémoire sur les conditions de résolubilité des équations par radicaux" of Evariste Galois. The m...
In this article, we investigate small-signal frequency and DC voltage stability of hybrid AC/DC power systems that combine AC and DC transmission, conventional machine- based generation, and converter-interfaced generation. The main contributions of...
BHs with integrable singularities (IS) have gained attention because, unlike usual regular BHs, they avoid a potentially unstable de Sitter core and the presence of an internal horizon that breaks predictability, while exhibiting finite tidal forces...
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High-harmonic generation (HHG) normally requires a careful adjustment of the driving laser intensity (typically $10^{14} - 10^{15}$ W/cm$^2$) and gas medium parameters to enable good phase matching conditions. In contrast with conventional wisdom, we...
Your anus is the end of your large intestine, where food waste completes its journey through your digestive tract and makes its exit. Muscles, nerves and mucous membranes in your anus work …
Jul 21, 2025 · The urethra is a tube that carries urine from the bladder to outside the body. Part of the broader urinary system, this passageway is located in the pelvic region. Its walls are composed of …
Your urethra is the tube that lets urine, a waste product, leave your body. Your urethra is part of your urinary system, which also includes your kidneys, bladder and ureters.
The paper presents analytic expressions of minimax (worst-case) estimates for solutions of linear abstract Neumann problems in Hilbert space with uncertain (not necessarily bounded!) inputs and boundary conditions given incomplete observations with s...
Ukrainian President Volodymyr Zelenskyy has been city-hopping across Europe to promote a “victory plan” that he said “aims to create the right conditions for a just end to the war” against Russia.