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#pressure

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Offentlig
Futurist Jim Carroll

"The future rewards those who adapt under pressure, not those who break because of it" - Futurist Jim Carroll

Over the last five days, I’ve shared how we lead ourselves and our organizations through this moment of global volatility—one shaped by economic uncertainty, political instability, and cultural retreat from the future.

Beginning by reaffirming belief in progress, even when it feels stalled

Confronting fear with action

Challenging nostalgia with vision

Spotlighting innovation as the antidote to inertia

Emphasizing the importance of thinking across time horizons—managing today while preparing for tomorrow

But there's something deeper that sits underneath all of that: pressure..
That’s the real test—managing this moment. Keeping our heads on straight. Not letting the negativity consume us or define our future. If there’s one constant through every downturn, disruption, or crisis, it’s this: stress is the defining force of the moment. And how we respond to that stress—organizationally, personally, and strategically—determines whether we fall back, freeze up, or forge forward into what’s next.

That’s why today, it’s not just about planning for the future.

It’s about learning to adapt under pressure.

Every moment of disruption applies pressure. And pressure reveals everything. It reveals which organizations and individuals have foundations that flex, and which ones crumble. It reveals leaders who focus forward—and those who fold under volatility.

Right now, we’re not just navigating an economic downturn. We’re navigating a world defined by compounding stress—market stress, leadership stress, and system stress. But stress, when met with strategy, becomes fuel for the future.

I’ve written about this before: “It’s in our response to volatility that our future is defined.”

The most future-ready companies don’t panic. They channel pressure into progress. They don’t crumble under stress—they restructure, refocus, and realign. They transform pressure into precision—cutting noise, not capacity. They rethink agility, not just in structure but in mindset. They use stress as a forcing function—to do what needed doing all along.

My advice is clear: You don’t rebuild your organization for the next crisis. You rebuild during this one—for the world that follows.

Stress is unavoidable. But breaking is not.

**#Adaptation** **#Pressure** **#Resilience** **#Stress** **#Future** **#Crisis** **#Leadership** **#Growth** **#Strategy** **#Volatility**

Original post: jimcarroll.com/2025/04/decodin

Offentlig
Rxiv mechanobio

📰 "An Efficient Integrator Scheme for Sampling the (Quantum) Isobaric-Isothermal Ensemble in (Path Integral) Molecular Dynamics Simulations"
arxiv.org/abs/2504.08342 #Cond-Mat.Stat-Mech #Physics.Class-Ph #Physics.Comp-Ph #Physics.Chem-Ph #Physics.Bio-Ph #Dynamics #Pressure #Cell

arXiv logo
arXiv.orgAn Efficient Integrator Scheme for Sampling the (Quantum) Isobaric-Isothermal Ensemble in (Path Integral) Molecular Dynamics SimulationsBecause most chemical or biological experiments are performed under conditions of controlled pressure and temperature, it is important to simulate the isobaric-isothermal ensemble at the atomic level to reveal the microscopic mechanism. By extending our configuration sampling protocol for the canonical ensemble, we propose a unified middle scheme to sample the coordinate (configuration) and volume distribution and thereby are able to accurately simulate either classical or quantum isobaric-isothermal processes. Various barostats and thermostats can be employed in the unified middle scheme for simulating real molecular systems with or without holonomic constraints. In particular, we demonstrate the recommended middle scheme by employing the Martyna-Tuckerman-Tobias-Klein barostat and stochastic cell-rescaling barostat, with the Langevin thermostat, in molecular simulation packages (DL_POLY, Amber, Gromacs, etc.). Benchmark numerical tests show that, without additional numerical effort, the middle scheme is competent in increasing the time interval by a factor of 5~10 to achieve the same accuracy of converged results for most thermodynamic properties in (path integral) molecular dynamics simulations.
Offentlig
Rxiv mechanobio

📰 "The Role of Buffer Gas in Shaping the D1 Line Spectrum of Potassium Vapour"
arxiv.org/abs/2504.07888 #Physics.Atom-Ph #Physics.Optics #Pressure #Cell

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arXiv.orgThe Role of Buffer Gas in Shaping the D1 Line Spectrum of Potassium VapourIn this study, we investigate the effect of buffer gas and magnetic field on the spectral line shapes of the potassium D1 transition using sealed vapour cells filled with varying amounts of neon as a buffer gas. Employing a dual-temperature control system, we independently manipulate the cell body and stem temperatures to explore Doppler and collisional effects on the spectrum. Our results show how the Voigt spectral profile changes from Gaussian- to Lorentzian-dominated forms due to pressure broadening and shifts caused by collisions between potassium atoms and neon. Our measurements are in excellent agreement with the literature values for potassium-neon collisions. For the first time we were able to incorporate the buffer-gas shift and broadening into the modified Voigt profile via the ElecSus code, and found excellent agreement between the predicted and measured line profiles. We also analyse the potassium D1 spectral lines in the hyperfine Paschen-Back regime using strong magnetic fields, demonstrating how Zeeman splitting modifies the pressure-broadened line shape. This work provides valuable insights into collision-induced broadening and shifts, enhancing our understanding of potassium spectroscopy and its application in the development of advanced magneto-optical filters for solar physics and other applications.
Replied in thread
Offentlig
Kevin Karhan :verified:

@ajsadauskas @JessTheUnstill @tomiahonen @fuchsiii obviously, that would've been a good standard for everyone, given that almost all non-#Gaming #Apps these days are #WebApps and at that point we'd not have 100+ MB #bloatware that essentially just loads a #Website and can't even cache shit!

Personally I believe the @europarl_en & @EUCommission could do that and establish as well as enforce an #EC #norm, just as they did with #USBc, #CCS2 and #GDPR!

#Android needs to be better as in being more than just the "lesser evil" compared to iOS!

Offentlig
Rxiv mechanobio

📰 "Complex Pressure Node Formation and Resonances Induced by Scatterers in a Standing-Wave Acoustic Cavity"
arxiv.org/abs/2503.21712 #Physics.Flu-Dyn #Pressure #Cell

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arXiv.orgComplex Pressure Node Formation and Resonances Induced by Scatterers in a Standing-Wave Acoustic CavityAcoustic pressure nodes in acoustophoretic devices are crucial for applications in tissue engineering, cell analysis, and particle trapping. Typically, a single primary node forms at the half-wavelength resonance condition, while its shape and position are constrained by the dimensions of the channel. The generation of additional nodes, along with control over their positions and shapes, is highly desirable in biomedical applications and could significantly enhance particle manipulation capabilities. To explore this potential, we numerically demonstrate the formation of additional, complex-shaped, nodes alongside the primary one, by a circular scatterer within a rectangular cavity. We identify three distinct types: ring, protuberant, and crescent nodes, whose formation depends on the size of the scatterer, its placement in the middle of the channel, and its corresponding resonant frequency. The key mechanism behind this formation is the enhancement of internal reflections, increasing destructive interference to promote node generation. To achieve this, we employ three key concepts: using a low-aspect ratio channel, positioning a rigid circular scatterer in the middle of the channel, and modeling all surfaces as perfect reflectors. Furthermore, we analyze the impact of the scatterer on acoustic pressure and quality factor, which is defined as the ratio of stored acoustic energy to damped acoustic energy per cycle. We show that additional nodes emerge in the presence of a scatterer, but they come at the cost of reduced acoustic pressure and energy in the channel. In summary, this study provides information on generating complex nodes in a standing wave acoustic cavity at the fundamental frequency, which has numerous applications for particle manipulation in acoustofluidic devices.
Offentlig
Bytes Europe

COVID-19 is causing other health-related issues byteseu.com/847273/ #Arkansas #ArkansasState #ASU #Blood #Covid #Doctor #Health #Heart #Medicine #NYIT #pressure #Sick

Bytes Europe · COVID-19 is causing other health-related issuesJONESBORO, Ark. (KAIT) - It’s been five years since COVID-19 arrived in Arkansas, and some getting COVID-19 today aren’t dealing with just respiratory issues.There have been cases of people who’ve had COVID-19, also having to deal with high blood pressure and heart issues.“One of the very things we were concerned about in the beginning with COVID-19 is it was just a really different virus,” said the dean of the New York Insititute of Technology College of Osteopathic Medicine at Arkansas State Dr. Shane Speights.Getting COVID-19 is not a fun experience, but there can be more issues it can cause other
Offentlig
Rxiv mechanobio

📰 "Investigation of pressure balance in proximity of sidewalls in deterministic lateral displacement"
arxiv.org/abs/2503.11839 #Physics.Flu-Dyn #Pressure #Matrix

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arXiv.orgInvestigation of pressure balance in proximity of sidewalls in deterministic lateral displacementDeterministic lateral displacement (DLD) is a popular technique for size-based separation of particles. One of the challenges in design of DLD chips is to eliminate the disturbance of fluid flow patterns caused by channel sidewalls intersecting with the pillars matrix. While there are numerous reports in the literature attempting to mitigate this issue by adjusting the gaps between pillars on the sidewalls and the closest ones residing on the bulk grid of DLD array, there are only few works that also configure the axial gap of pillars adjacent to accumulation sidewall to maintain a desired local pressure field. In this work, we study various designs numerically to investigate the effects of geometrical configurations of sidewalls on critical diameter and first stream flux fraction variations across channel. Our results show that regardless of the model used for boundary gap profile, applying a pressure balance scheme can improve the separation performance by reducing the critical diameter variations. In particular, we found that for a given boundary gap distribution, there can be two desired parameter sets with relatively low critical diameter variations. One is related to sufficiently low lateral resistance of interface unit cells next to accumulation sidewall, while the other one emerges by reducing the axial resistance of the interface unit cells to an appropriate extent. We believe that this work can pave the way for designing DLD systems with improved performance, which can be critically important for applications such as separation of rare cells, among others, wherein target species need to be concentrated into as narrow a stream as possible downstream of device to enhance purity and recovery rate simultaneously.
Offentlig
Rxiv mechanobio

📰 "Revisiting compressible and incompressible pressure-strain interaction in kinetic plasma turbulence"
arxiv.org/abs/2503.11825 #Physics.Space-Ph #Physics.Plasm-Ph #Pressure #Cell

arXiv logo
arXiv.orgRevisiting compressible and incompressible pressure-strain interaction in kinetic plasma turbulenceIn this study, we revisit the pressure-strain interaction in kinetic turbulence, and in particular we re-examine the decomposition of pressure-strain interaction into compressive and incompressive parts. The pressure dilatation ingredient is clearly due to plasma compressions, but here using kinetic particle-in-cell (PIC) simulations of plasma turbulence, it is demonstrated that the remaining anisotropic part, often called Pi-D, also contains contributions due to compressive, non solenoidal velocities of the particle species. The compressive Pi-D can play a significant role in systems with low plasma $β$ even if the system starts with small density variations. The compressive ingredient of Pi-D is found to be anticorrelated with both incompressive Pi-D and pressure dilatation.
Offentlig
Rxiv mechanobio

📰 "Parallel Collisionless Shocks in strongly Magnetized Electron-Ion Plasma. I. Temperature anisotropies"
arxiv.org/abs/2503.10758 #Physics.Plasm-Ph #Physics.Comp-Ph #Astro-Ph.Ga #Astro-Ph.He #Astro-Ph.Sr #Pressure #Cell

arXiv logo
arXiv.orgParallel Collisionless Shocks in strongly Magnetized Electron-Ion Plasma. I. Temperature anisotropiesCollisionless electron-ion shocks are fundamental to astrophysical plasmas, yet their behavior in strong magnetic fields remains poorly understood. Using Particle-in-Cell (PIC) simulations with the SHARP-1D3V code, we investigate the role of the ion magnetization parameter $σ_i$ in parallel shock transitions. Strongly magnetized converging flows ($σ_i > 1$) exhibit lower density compression ratios ($R \sim 2$), smaller entropy jumps, and suppressed particle acceleration, while maintaining pressure anisotropy stability due to conserved perpendicular temperatures across the shock, alongside increased parallel temperatures. In contrast, weakly magnetized shocks drive downstream mirror and firehose instabilities due to ion temperature anisotropy, which are suppressed in strongly magnetized cases. Additionally, weakly magnetized shocks exhibit the onset of a supra-thermal population induced by shock-drift acceleration, with most of the upstream kinetic energy thermalized for both electrons and ions in the downstream region. Our results demonstrate that perpendicular temperatures for both species are conserved in strongly magnetized cases and highlight deviations from standard ideal magnetohydrodynamic (MHD) behavior. These findings provide critical insights into the role of magnetic fields in parallel collisionless astrophysical shocks.
Offentlig
Rxiv mechanobio

📰 "Experimental and numerical study of CO$_{2}$ dissolution in a heterogeneous Hele-Shaw cell"
arxiv.org/abs/2503.05827 #Physics.Flu-Dyn #Pressure #Cell

arXiv.orgExperimental and numerical study of CO$_{2}$ dissolution in a heterogeneous Hele-Shaw cellWe investigate the convective instability resulting from the dissolution of carbon dioxide (CO$_{2}$) into water in a heterogeneous Hele-Shaw cell utilizing both experimental and numerical approaches. Experiments are conducted in a Hele-Shaw cell with a variable gap width corresponding to a log-normally distributed permeability of variance $σ_{\log K}^2 = 0.135$. Two mean gaps (370 $μ$m and 500 $μ$m) with the same correlation lengths ($λ_x$ = 0.032 m and $λ_z$ = 0.016 m) are considered. Experiments in homogeneous cells with a constant gap are also performed. The CO$_2$ partial pressure ($P_{\text{CO}_{2}}$) is varied between $12\%\pm 1\%$ (0.12 bar) and $85\%\pm 1\%$ (0.85 bar). The convective patterns are visualized using Bromocresol green. The effect of the heterogeneity on the instability is analyzed through its wavenumber, amplitude and growth rate. There is a good agreement between the experimental and numerical results. Fingers appear more dispersive and distorted in the heterogeneous media. Heterogeneous cases display a larger instability amplitude, faster growth rate and smaller dimensionless wavenumber. This reflects that heterogeneity accelerates the instability and the merging of the fingers. A comparison of the autocorrelation function of the fingering patterns and the permeability field shows that heterogeneity increases the dimensionless correlation length of the fingering pattern, which slows down its growth when its size becomes comparable to the heterogeneity.
Offentlig
Rxiv mechanobio

📰 "Novatron: Equilibrium and Stability"
arxiv.org/abs/2503.03387 #Physics.Plasm-Ph #Pressure #Cell

arXiv.orgNovatron: Equilibrium and StabilityThe Novatron is a fusion concept characterized by its axisymmetric mirror-cusp magnetic topology. The magnetic field exhibits good curvature and a high mirror ratio. Plasma equilibrium profiles for the Novatron are obtained by solving an axisymmetric guiding-center anisotropic boundary-value problem. These profiles are then analyzed with respect to several MHD stability criteria, including the mirror, firehose, and interchange conditions. A generalized Rosenbluth and Longmire MHD interchange criterion, where anisotropic pressure variations along flux tubes are allowed for, is subsequently employed for determining stable MHD equilibria. Additionally, a corresponding CGL double adiabatic interchange criterion is investigated for obtaining stable equilibria in the collisionless limit, both theoretically and numerically using the large scale Hybrid Particle-In-Cell code WarpX.
Offentlig
Rxiv mechanobio

📰 "Nitrogen and hydrogen intercalation into crystalline fullerite C$_{60}$ and photoluminescent studies in a wide temperature range"
arxiv.org/abs/2503.02920 #Cond-Mat.Mtrl-Sci #Physics.Atm-Clus #Physics.Optics #Cond-Mat.Other #Pressure #Matrix

arXiv.orgNitrogen and hydrogen intercalation into crystalline fullerite C$_{60}$ and photoluminescent studies in a wide temperature rangeOptical properties of fullerite C$_{60}$ single crystals saturated with hydrogen and nitrogen molecules were studied in the temperature range from 20 K to 230 K using the spectral-luminescent method. Saturation was carried out under a pressure of 30 atm at various temperatures from 470 K to 720 K. At saturation temperatures above 520 K for hydrogen and 690 K for nitrogen, chemical interaction of impurity molecules and the fullerene matrix occurs, forming new chemical compounds. The results of a study of the photoluminescent properties of a new substances are presented for the first time.
Offentlig
Rxiv mechanobio

📰 "Nonlinear particle motion and bursty periodic energy deposition in inductively coupled plasmas"
arxiv.org/abs/2503.03508 #Physics.Plasm-Ph #Physics.App-Ph #Pressure #Cell

arXiv.orgNonlinear particle motion and bursty periodic energy deposition in inductively coupled plasmasTwo-dimensional electromagnetic particle-in-cell simulations are employed to study particle motion and power deposition in inductively coupled plasmas. We show that under condition of low-frequency ($\sim\mathrm{MHz}$) and low-pressure, the electron motion is highly nonlinear in the skin region near the coil: electrons are strongly magnetized, and the energy deposition is small throughout most of the RF cycle. However, during the phase when the RF magnetic field vanishes, electrons briefly demagnetize, causing a jet-like current penetrating into the plasma. During these short time intervals the power deposition becomes high, resulting in periodic bursts in the energy deposition. We developed a new kinetic theory, which not only provides analytical expressions for the plasma current and energy deposition, but also predicts a new nonlinear relation between electron current and the RF inductive electric field. A criterion for transition between the low frequency, periodic bursty nonlinear regime and the high frequency, anomalous non-local skin effect regime is proposed and verified using a series of fully kinetic 2D particle-in-cell simulations.
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