Results 81 to 90 of about 876,562 (293)

Numerical simulation of steady-state and non-steady-state modes of a switching discharge in vacuum

Physics of Plasmas
This paper presents the results of a two-dimensional kinetic simulation of the switching of a vacuum gap by the cathode plasma flare. It is shown that, depending on the magnitude of the current passed through the vacuum gap, the gap can be switched in both a steady-state mode, in which the spark turns into a quasi-steady-state arc, and a non-steady ...
S. A. Barengolts, Yu. I. Mamontov, D. L. Shmelev, I. V. Uimanov   +3 more
openaire   +1 more source

Structural insights into an engineered feruloyl esterase with improved MHET degrading properties

FEBS Letters, EarlyView.
A feruloyl esterase was engineered to mimic key features of MHETase, enhancing the degradation of PET oligomers. Structural and computational analysis reveal how a point mutation stabilizes the active site and reshapes the binding cleft, expading substrate scope.
Panagiota Karampa, Konstantinos Makryniotis, Theofani‐Iosifina Sousani, Evangelos Topakas, Vangelis Daskalakis, Maria Dimarogona   +5 more
wiley   +1 more source

Dual prescribed terminal sliding mode trajectory tracking control of a robotic arm based on extended state observer

Journal of Applied Science and Engineering
To address the trajectory tracking control problem of robotic arm with uncertain internal models and external random disturbances, a prescribed performance and predefined-time nonsingular fast terminal sliding mode control (PPPTNFTSMC) based on a sliding
Xin Zhang, Jiaqi Dong
doaj   +1 more source

Gut microbiome and aging—A dynamic interplay of microbes, metabolites, and the immune system

FEBS Letters, EarlyView.
Age‐dependent shifts in microbial communities engender shifts in microbial metabolite profiles. These in turn drive shifts in barrier surface permeability of the gut and brain and induce immune activation. When paired with preexisting age‐related chronic inflammation this increases the risk of neuroinflammation and neurodegenerative diseases.
Aaron Mehl, Eran Blacher
wiley   +1 more source

Steady-State Disturbance-Rejection Controllability for LTI Systems with Rigid-Body Mode

Actuators
Controllability metrics based on system Gramians have been widely adopted to provide quantitative measures of the degree of controllability (DoC) and the disturbance rejection capability (DoDR) of dynamical systems.
Haemin Lee, Jinseong Park
doaj   +1 more source

Mixed-mode growth of a multicomponent precipitate in the quasi-steady state regime

Materials Theory, 2018
An exact analytical solution of the Fick’s second law was developed and applied to the mixed-mode growth of a multicomponent ellipsoidal precipitate growing with constant eccentricities in the quasi-stationary regime. The solution is exact if the nominal
Tohid Naseri, Daniel Larouche, Rémi Martinez, Francis Breton   +3 more
doaj   +1 more source

Theory of the spatial structure of non-linear lasing modes

, 2006
A self-consistent integral equation is formulated and solved iteratively which determines the steady-state lasing modes of open multi-mode lasers. These modes are naturally decomposed in terms of frequency dependent biorthogonal modes of a linear wave ...
A. Douglas Stone, A. E. Siegman, H. E. Tureci, H. Haken, H. Haken, Hakan E. Türeci, Li Ge, M. Sargent, P. M. Morse, P. Mandel   +9 more
core   +1 more source

A methionine‐lined active site governs carbocation stabilization and product specificity in a bacterial terpene synthase

FEBS Letters, EarlyView.
This study reveals a unique active site enriched in methionine residues and demonstrates that these residues play a critical role by stabilizing carbocation intermediates through novel sulfur–cation interactions. Structure‐guided mutagenesis further revealed variants with significantly altered product profiles, enhancing pseudopterosin formation. These
Marion Ringel, Carl P. O. Helmer, Shani Zev, Ronja Driller, Emily Buhr, Markus Reinbold, Renana Schwartz, Gabriel Foley, Mikael Boden, Daniel Garbe, Gerhard Schenk, Dan Thomas Major, Bernhard Loll, Thomas Brück   +13 more
wiley   +1 more source

Two-Dimensional Simulation of Mass Transfer in Unitized Regenerative Fuel Cells under Operation Mode Switching

Energies, 2016
A two-dimensional, single-phase, isothermal, multicomponent, transient model is built to investigate the transport phenomena in unitized regenerative fuel cells (URFCs) under the condition of switching from the fuel cell (FC) mode to the water ...
Lulu Wang, Hang Guo, Fang Ye, Chongfang Ma   +3 more
doaj   +1 more source

Distributed entanglement induced by dissipative bosonic media

, 2012
We describe a scheme with analytic result that allows to generate steady-state entanglement for two atoms over a dissipative bosonic medium. The resonant coupling between the mediating bosonic mode and cavity modes produces three collective atomic decay ...
Chen, Xin-Yu, Shen, Li-Tuo, Wu, Huai-Zhi, Yang, Zhen-Biao, Zheng, Shi-Biao   +4 more
core   +1 more source