Results 191 to 200 of about 292,024 (345)

Second Variation of the "Total Scalar Curvature" on Contact Manifolds [PDF]

, 1995
David E. Blair, Domenico Perrone
openalex   +1 more source

Deformations of the scalar curvature of a partially integrable pseudohermitian manifold [PDF]

arXiv
We consider deformations of the scalar curvature of a partially integrable pseudohermitian manifold, in analogy with the work of Fischer and Marsden on Riemannian manifolds. In particular, we introduce and discuss $R$-singular spaces, give sufficient conditions for the stability of the scalar curvature, and give a partial infinitesimal rigidity result ...
arxiv  

On axisymmetric solutions of the conformal scalar curvature equation on $S^n$ [PDF]

, 2000
Chiun‐Chuan Chen, Chang‐Shou Lin
openalex   +1 more source

Calibration and volunteer testing of a prototype contactless respiratory motion detection system based on laser tracking

Journal of Applied Clinical Medical Physics, EarlyView.
Abstract Purpose The goal of this study was to assess the feasibility of a cost‐effective prototype of a laser‐based respiratory motion detection system utilizing a Leuze LDS for breath monitoring through calibration and volunteer tests. Methods This study was performed using the Anzai AZ‐773 V and computerized imaging reference systems (CIRS) motion ...
Isnaini Nur Islami, Amar Ma'ruf Irfan Muhamadi, Wahyu Edy Wibowo, Aloysius Mario Yudi Putranto, Arief Sudarmaji, Fielda Djuita, Supriyanto Ardjo Pawiro   +6 more
wiley   +1 more source

Improving VMAT dose calculation accuracy and planning quality via a GPU‐accelerated Fourier transform dose calculation algorithm

Journal of Applied Clinical Medical Physics, EarlyView.
Abstract Background Inverse planning typically utilizes fast, less accurate dose calculation algorithms during the iterative optimization process, thus leading to dose calculation errors (DCEs) and suboptimal plans that often require dose normalization and/or plan re‐optimization.
Kenny Guida, Chaoqiong Ma, Joy Patel, Krishna Reddy, H. Harold Li   +4 more
wiley   +1 more source

On the existence of solutions of prescribing scalar curvature problem [PDF]

, 2000
Li Ma
openalex   +1 more source

Evaluation of OPTOS wide‐field fundus image projections for radiotherapy planning of uveal melanoma

Journal of Applied Clinical Medical Physics, EarlyView.
Abstract Purpose To investigate the relationship between the stereographic and azimuthal equidistant projection (AEP) of the human retina for radiotherapy planning with OPTOS optomap wide‐field fundus images (Optos, UK). Further, the geometric accuracy of an OPTOS fundus image is quantified.
Jörg Wulff, Benjamin Koska, Michael Giese, Christian Bäumer, Ronald Richter, Andreas Foerster, Nikolaos E. Bechrakis, Beate Timmermann   +7 more
wiley   +1 more source

Rigidity of area minimizing tori in 3-manifolds of nonnegative scalar curvature [PDF]

, 2000
Mingliang Cai, Gregory J. Galloway
openalex   +1 more source

High spatial resolution dosimetry for radiation oncology with “MagicPlates,” a new 976‐pixel monolithic silicon detector

Journal of Applied Clinical Medical Physics, EarlyView.
Abstract Purpose We introduce the next generation of “MagicPlate” 2D monolithic pixelated semiconductor detectors – MagicPlate‐976 (MP976). It features a larger array area, higher spatial resolution, and does not require external triggering. We perform a comprehensive characterization for small‐field steep‐dose‐gradient dosimetry applications in ...
Ilia Filipev, Saree Alnaghy, Martin Carolan, Jason Paino, Marco Petasecca, Dean Cutajar, Joel Poder, Justin B. Davies, Bradley M. Oborn, Nicholas Hardcastle, Susanna Guatelli, Michael Lerch, Tomas Kron, Anatoly Rosenfeld   +13 more
wiley   +1 more source

Existence results on prescribing zero scalar curvature [PDF]

, 2000
Qi S. Zhang, Zhongzi Zhao
openalex   +1 more source