Results 51 to 60 of about 11,355 (303)

1 2 $$ \frac{1}{2} $$ Calabi-Yau 3-folds, Calabi-Yau 3-folds as double covers, and F-theory with U(1)s

open access: yesJournal of High Energy Physics, 2020
In this study, we introduce a new class of rational elliptic 3-folds, which we refer to as “1/2 Calabi-Yau 3-folds”. We construct elliptically fibered Calabi-Yau 3-folds by utilizing these rational elliptic 3-folds.
Yusuke Kimura
doaj   +1 more source

Physics of infinite complex structure limits in eight dimensions

open access: yesJournal of High Energy Physics, 2022
We investigate infinite distance limits in the complex structure moduli space of F-theory compactified on K3 to eight dimensions. While this is among the simplest possible arenas to test ideas about the Swampland Distance Conjecture, it is nevertheless ...
Seung-Joo Lee   +2 more
doaj   +1 more source

Stability conditions on K3 surfaces [PDF]

open access: yesDuke Mathematical Journal, 2008
This paper contains a description of one connected component of the space of stability conditions on the bounded derived category of coherent sheaves on a complex algebraic K3 surface.
openaire   +5 more sources

Compact moduli of K3 surfaces

open access: yesAnnals of Mathematics, 2023
To appear in Annals of ...
Alexeev, Valery, Engel, Philip
openaire   +3 more sources

Fano 3-folds, K3 surfaces and graded rings [PDF]

open access: yes, 2002
Explicit birational geometry of 3-folds represents a second phase of Mori theory, going beyond the foundational work of the 1980s. This paper is a tutorial and colloquial introduction to the explicit classification of Fano 3-folds (Q-Fano 3-folds), a ...
Reid, Miles   +2 more
core  

Polarizable Vanadium Dipoles Promote Water Dissociation on Vanadium‐Based Metal Organic Framework

open access: yesAdvanced Functional Materials, EarlyView.
The polarization of unpaired V 3d electrons weakens the H─O bond to improve water dissociation by the dual Vδ+:O─H and Pλ−:H─O coupling hydrogen bonds formation and relaxation. P@V‐MOF electrocatalyst shows low overpotentials (94 mV in acid, 178 mV in neutral, and 77 mV in alkaline solutions) with excellent stability for effective overall water ...
Xinjuan Liu   +13 more
wiley   +1 more source

Dynamic Interfacial Chemistry of Choline Chloride as Electrolyte Additive for Stable Zn‐Iodine Batteries

open access: yesAdvanced Functional Materials, EarlyView.
Choline chloride (ChCl) additive enables dynamic interface engineering in Zn‐I2 batteries by forming hydrophobic polyiodide complexes and a Zn‐stabilizing Ch+‐rich layer under electric field modulation. This dual‐function strategy suppresses iodine hydrolysis and dendrite formation, while optimizing Zn2+ solvation and transport for high‐efficiency ...
Xiaoyu Bi   +16 more
wiley   +1 more source

On the Hodge conjecture for products of certain surfaces [PDF]

open access: yes, 2003
In this thesis we prove the Hodge conjecture for products of smooth projective surfaces S(_1) x S(_2), where S(_2) = A is an Abelian surface and S (_1) is such that P(_g)(S(_1)) = 1, q = 2.
J. Ramón Marí, José   +1 more
core  

Polymer‐Redox Interactions Enhance Ferro/Ferricyanide Thermogalvanic Cells

open access: yesAdvanced Functional Materials, EarlyView.
Polyelectrolyte could modify the hydration structure of the redox couple in solution and improve the output performance of thermogalvanic cells, providing new fundamental insight into how electrostatic interactions can be exploited to tailor thermoelectric properties.
Pedro Santos Candiotto de Oliveira   +6 more
wiley   +1 more source

The Effect of Hydrofluoric Acid Surface Treatment on the Cyclic Fatigue Resistance of K3 NiTi Instruments

open access: yesBioinorganic Chemistry and Applications, 2017
The aim of this study was to investigate the effect of 50% hydrofluoric acid (HF) surface treatment on the cyclic fatigue resistance (CFR) of K3 NiTi instruments. Twenty as-received and twenty HF-treated K3 NiTi instruments were compared in CFR.
Kee-Yeon Kum, Seok Woo Chang
doaj   +1 more source

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