Results 1 to 10 of about 11,436 (251)

HARMONIC STRUCTURES AND INTRINSIC TORSION [PDF]

Transformation Groups, 2015
We discuss the construction of Sp(2)Sp(1)-structures whose fundamental form is closed. In particular, we find 10 new examples of 8-dimensional nilmanifolds that admit an invariant closed 4-form with stabiliser Sp(2)Sp(1). Our constructions entail the notion of SO(4)-structures on 7-manifolds. We present a thorough investigation of the intrinsic torsion
Diego Conti, Thomas Bruun Madsen, Conti Diego   +2 more
exaly   +6 more sources

Superstrings with intrinsic torsion [PDF]

Physical Review D, 2004
We systematically analyse the necessary and sufficient conditions for the preservation of supersymmetry for bosonic geometries of the form R^{1,9-d} \times M_d, in the common NS-NS sector of type II string theory and also type I/heterotic string theory.
Jérôme Gauntlett, Daniel Waldram, Dario Martelli   +2 more
exaly   +3 more sources

Isolated Fallopian Tube Torsion Concomitant With an Adenomatoid Tumor Arising From the Fallopian Tube: A Case Report [PDF]

Case Reports in Obstetrics and Gynecology
Isolated fallopian tube torsion (IFTT) is a rare condition in which the fallopian tube undergoes torsion without ovary involvement. The causes of IFTT vary widely, ranging from intrinsic abnormalities of the fallopian tube itself to extrinsic factors ...
Fumitaka Mukouyama, Hiroshi Ishikawa, Aki Kinoshita, Mariko Inoue, Yoshinori Itsuka, Yohei Hosokawa, Kenichi Harigaya, Jun-Ichiro Ikeda, Kaori Koga   +8 more
doaj   +2 more sources

Automated 3-Dimensional Measurements of First Metatarsal Dysplasia in Hallux Valgus [PDF]

Foot & Ankle Orthopaedics
Background: Pronation of first metatarsal (M1) in hallux valgus (HV) is currently the subject of a growing body of scientific research. Several methods of manual measurements have been developed, providing heterogeneous results.
Luc Meuric MD, Matthieu Lalevée MD, PhD, Nacime Salomao Barbachan Mansur MD, PhD, Scott Ellis MD, Albert DaCosta BS, François Lintz MD, PhD, Matthew S. Conti MD, Cesar de Cesar Netto MD, PhD   +7 more
doaj   +2 more sources

The intrinsic torsion of almost quaternion-Hermitian manifolds [PDF]

Annales De L'Institut Fourier, 2008
We study the intrinsic torsion of almost quaternion-Hermitian manifolds via the exterior algebra. In particular, we show how it is determined by particular three-forms formed from simple combinations of the exterior derivatives of the local Kähler forms.
Andrew Francis Swann, Swann Andrew
exaly   +3 more sources

Pure spinors, intrinsic torsion and curvature in even dimensions

Differential Geometry and Its Applications, 2016
v2. Cleaned up version. Typos and errors fixed. Some reordering. v3. Restructured - some material moved to an additional appendix for clarity - further typos fixed and other minor improvements v4. Presentation improved. Some material removed to be included in a future article. v5. As published: Abstract and intro rewritten.
Arman Taghavi-Chabert
exaly   +7 more sources

Geometry of G-Structures via the Intrinsic Torsion [PDF]

Symmetry, Integrability and Geometry: Methods and Applications (SIGMA), 2016
We study the geometry of a $G$-structure $P$ inside the oriented orthonormal frame bundle ${\rm SO}(M)$ over an oriented Riemannian manifold $M$. We assume that $G$ is connected and closed, so the quotient ${\rm SO}(n)/G$, where $n=\dim M$, is a normal homogeneous space and we equip ${\rm SO}(M)$ with the natural Riemannian structure induced from the ...
exaly   +5 more sources

Intrinsic Conformational Energetics Associated with the Glycosyl Torsion in DNA: A Quantum Mechanical Study [PDF]

Biophysical Journal, 2002
The glycosyl torsion (chi) in nucleic acids has long been recognized to be a major determinant of their conformational properties. chi torsional energetics were systematically mapped in deoxyribonucleosides using high-level quantum mechanical methods, for north and south sugar puckers and with gamma in the g(+) and trans conformations.
Alex Mackerell, Brigitte Hartmann, Lennart Nilsson   +2 more
exaly   +3 more sources

Automated Three-Dimensional Measurements of First Metatarsal Dysplasia in Hallux Valgus [PDF]

Foot & Ankle Orthopaedics
Research Type: Level 3 - Retrospective cohort study, Case-control study, Meta-analysis of Level 3 studies Introduction/Purpose: The pronation of the first metatarsal (M1) in hallux valgus (HV) is currently the subject of a growing body of scientific ...
Luc Meuric MD, Matthieu Lalevée MD, PhD, Scott Ellis MD, Francois Lintz MD, PhD, Cesar De Cesar Netto MD, PhD   +4 more
doaj   +2 more sources

Extrinsic and intrinsic fracture behavior of high pressure torsion deformed nickel

Scripta Materialia, 2012
Nickel discs (>99.5 wt.%) were deformed by high pressure torsion (HPT) at different temperatures (-196 °C, 25 °C, 200 °C, and 400 °C) until saturation was reached. The strength and fracture behavior of microdefect-free samples and samples with inclusions were investigated using micro and macro tensile tests, respectively.
Reinhard Pippan
exaly   +3 more sources