Results 91 to 100 of about 3,790,471 (295)

Neutral depletion and the helicon density limit

Physics of Plasmas, 2013
It is straightforward to create fully ionized plasmas with modest rf power in a helicon. It is difficult, however, to create plasmas with density >1020 m−3, because neutral depletion leads to a lack of fuel. In order to address this density limit, we present fast (1 MHz), time-resolved measurements of the neutral density at and downstream from ...
R. M. Magee, M. E. Galante, J. Carr, G. Lusk, D. W. McCarren, E. E. Scime   +5 more
openaire   +2 more sources

β‐Catenin/c‐Myc Axis Modulates Autophagy Response to Different Ammonia Concentrations

Advanced Biology, Volume 9, Issue 3, March 2025.
Ammonia, detoxified by the liver into urea and glutamine, impacts autophagy differently at varying levels. Low ammonia activates autophagy via c‐Myc and β‐catenin, while high levels suppress it. Using Huh7 cells and Spf‐ash mice, c‐Myc's role in cytoprotective autophagy is revealed, offering insights into hyperammonemia and potential therapeutic ...
S. Sergio, B. Spedicato, G. Corallo, A. Inguscio, M. Greco, D. Musarò, D. Vergara, A. F. Muro, G. De Sabbata, L. R. Soria, N. Brunetti Pierri, M. Maffia   +11 more
wiley   +1 more source

The Daytime Variations of Thermospheric Temperature and Neutral Density Over Beijing During Minor Geomagnetic Storm on 3–4 February 2022

Space Weather
On 3 February 2022, 38 satellites launched by SpaceX re‐entered the atmosphere and were subsequently destroyed. An investigation found that a minor geomagnetic storm occurred on 3–4 February 2022 led to a neutral density enhancement and large atmospheric
Shaoyang Li, Zhipeng Ren, Tingting Yu, Guangming Chen, Guozhu Li, Biqiang Zhao, Xinan Yue, Yong Wei   +7 more
doaj   +1 more source

The state of mid-latitude thermosphere retrieved from ionosonde and Swarm satellite observations during geomagnetic storms in February 2022

Journal of Space Weather and Space Climate
This analysis of the impact of geomagnetic storms on the Thermosphere-Ionosphere system provides critical insights into the complex interplay between geomagnetic activity and the upper atmosphere dynamics. On February 3, 2022, SpaceX launched 49 Starlink
Perrone Loredana, Mikhailov Andrey
doaj   +1 more source

Case report: Utilization of neutral density filters for densitometry analysis of dense corneal opacities. [PDF]

Am J Ophthalmol Case Rep, 2022
Meka A, Moezzi C, Brocks D.
europepmc   +1 more source

Dynamic Semiparametric Factor Models in Risk Neutral Density Estimation [PDF]

Dimension reduction techniques for functional data analysis model and approximate smooth random functions by lower dimensional objects. In many applications the focus of interest lies not only in dimension reduction but also in the dynamic behaviour of ...
Volker Krätschmer, Enzo Giacomini, Wolfgang Härdle   +2 more
core  

A Numerical–Experimental Approach for Multi‐Matrix Fiber‐Reinforced Plastics Characterization Using Finite Element Model Updating

Advanced Engineering Materials, EarlyView.
A numerical–experimental framework is developed for characterizing multi‐matrix fiber‐reinforced polymers (MM‐FRPs) combining epoxy and polyurethane matrices. Harmonic bending tests are integrated with finite element model updating (FEMU) to simultaneously identify elastic and viscoelastic material parameters.
Rodrigo M. Dartora, Tales V. Lisbôa, Axel Spickenheuer, Rogério J. Marczak, Jakson M. Vassoler   +4 more
wiley   +1 more source

Understanding and Modeling the Dynamics of Storm‐Time Atmospheric Neutral Density Using Random Forests

Space Weather
Atmospheric neutral density is a crucial component to accurately predict and track the motion of satellites. During periods of elevated solar and geomagnetic activity atmospheric neutral density becomes highly variable and dynamic.
K. Murphy, A. J. Halford, V. Liu, J. Klenzing, J. Smith, K. Garcia‐Sage, J. Pettit, I. J. Rae   +7 more
doaj   +1 more source

Forecasting global and multi-level thermospheric neutral density and ionospheric electron content by tuning models against satellite-based accelerometer measurements. [PDF]

Sci Rep, 2022
Forootan E, Kosary M, Farzaneh S, Kodikara T, Vielberg K, Fernandez-Gomez I, Borries C, Schumacher M.   +7 more
europepmc   +1 more source

Thermomechanical Fatigue and Creep–Fatigue Interaction of Inconel 718 Additively Manufactured by Laser Beam Powder Bed Fusion

Advanced Engineering Materials, EarlyView.
Thermomechanical fatigue tests of laser beam powder bed fusion (PBF‐LB) Inconel 718 show that the additively manufactured material reaches almost the lifetimes of conventionally‐rolled material under no‐dwell conditions. Introducing dwell times at the maximum temperature markedly reduces the lifetimes due to pronounced grain boundary sliding associated
Stefan Guth, Tomáš Babinský, Jan Lars Riedel, Wen Hao Kan, Aijun Huang, Martin Heilmaier, Ivo Šulák   +6 more
wiley   +1 more source