Results 111 to 120 of about 22,762 (212)

Lorentzian homogeneous structures with indecomposable holonomy

Journal of the London Mathematical Society, Volume 113, Issue 5, May 2026.
Abstract For a Lorentzian homogeneous space, we study how algebraic conditions on the isotropy group affect the geometry and curvature of the homogeneous space. More specifically, we prove that a Lorentzian locally homogeneous space is locally isometric to a plane wave if it admits an Ambrose–Singer connection with indecomposable, non‐irreducible ...
Steven Greenwood, Thomas Leistner
wiley   +1 more source

Prospective Environmental Impact Assessment of Scaling Up Perovskite/Silicon Tandem Solar Cells to Industrial Applications

ChemSusChem, Volume 19, Issue 8, 28 April 2026.
This prospective life cycle analysis evaluates perovskite–silicon (PSC–Si) tandem solar cells (TSCs), assessing environmental impacts from their material extraction to end‐of‐life. We compare the environmental impact of four TSC designs with that of silicon PV, highlighting hotspots in tandem architecture, and explore strategies to reduce environmental
Mercy Jelagat Kipyator, Federico Rossi, Jaume‐Adrià Alberola‐Borràs, Rosario Vidal, Maria Laura Parisi, Adalgisa Sinicropi   +5 more
wiley   +1 more source

Improved power loss balance control for modular multilevel converters based on variable capacitor voltage deviation predefined value under SM malfunction

International Journal of Electrical Power & Energy Systems
When it concerns the reliable working of the modular multilevel converter (MMC), the power loss balance control cannot be ignored. Under the submodule (SM) malfunction condition, each arm of the MMC operates in an asymmetrical status, resulting in ...
Jifeng Zhao, Chaoyue Gu, Sitong Wu, Wenfeng Liu, Yang Lei, Jun Hang, Shichuan Ding   +6 more
doaj   +1 more source

R*-Small Submodules and -Hollow Modules

Iraqi Journal of Science
The purpose  of this study is to present  a new concepts on a module M over a ring, these concepts is called R*-small sub module, R*-hollow module which present generalizations of the small submodule and hollow module, respectively. Key characteristics of these concepts such as the image and direct sum of R*-small sub module, R*-hollow module are R ...
Mustafa Mohammed Jasim, Wasan Khalid
openaire   +1 more source

Modules whose small submodules have Krull dimension

Journal of Pure and Applied Algebra, 1998
to appear in the Miskolc conference proceeding ...
openaire   +2 more sources

Analysis and Control of Voltage Stability in Offshore Wind Systems Under Small Disturbances

Energies
This paper proposes an analysis of voltage stability under small disturbances following the integration of an offshore wind farm into a real power system, considering various load and generation scenarios under both normal and post-disturbance conditions.
João P. L. Dantas, Marley F. Tavares, Ana J. O. Marques, Murilo E. C. Bento   +3 more
doaj   +1 more source

New small, S-essential and S-small soft submodules

Gulf Journal of Mathematics
In this paper, we define a new version of small soft submodules by using the operation sums that were introduced by Turkmen and Pancar. Moreover, we introduce the concepts of S-small soft submodules and S-essential soft submodules. Moreover, we investigate their properties by focusing on mapping of each soft module.
Poramate Sangchan, Ronnason Chinram, Samruam Baupradist   +2 more
openaire   +1 more source

Iso-retractability of modules related to small submodules

International Electronic Journal of Algebra
We study the notion of small iso-retractable modules. We prove that a small iso-retractable module is either $J$-semisimple or iso-retractable (iso-simple). Further, we prove that a ring $R$ is a left V-ring if and only if every left $R$-module is small iso-retractable.
Nirbhay Kumar, Avanish Chaturvedi
openaire   +1 more source

Cooperative modular multilevel converter control based on PSO-optimized fuzzy-PI and hierarchical finite-state model predictive control. [PDF]

Sci Rep
Liu Y, Tian Y, Zhang W, Wang Y.
europepmc   +1 more source