Publications by authors named "H S Sekhar"
Article Synopsis
- The investigation focused on the local structure of the two-dimensional layered material BiRhSe, which exhibits both superconducting and charge-density wave states.
- The study utilized X-ray fluorescence holography to analyze the crystal structure at temperatures of 300 K and 200 K, revealing significant changes in atomic arrangement around the critical temperature of 240 K.
- The results suggest a supercell structure for BiRhSe below the CDW transition, providing crucial insights into the relationship between the superconducting and charge-density wave states.
Background: In patients with squamous cell carcinoma of the anus (SCCA), magnetic resonance (MR) imaging is recommended for pre-treatment staging prior to chemo-radiotherapy (CRT), but large-scale evaluation of its staging performance is lacking.
Methods: We re-characterised pre-treatment MRs from 228 patients with non-metastatic SCCA treated consecutively by CRT (2006-2015) at one UK cancer centre. We derived TN staging from tumour size (mrTr) and nodal involvement (mrN), and additionally characterised novel beyond TN features such as extramural vascular invasion (mrEMVI) and tumour signal heterogeneity (mrTSH).
A intermediate multidomain state and large crystallographic tilting of 1.78° for the (hh0) planes of a (001)-oriented single-domain Mn-doped BiFeO (BFMO) thin film were found when an electric field was applied along the [110] direction. The anomalous crystallographic tilting was caused by ferroelastic domain switching of the 109° domain switching.
View Article and Find Full Text PDFThe local structure of the two-dimensional van der Waals material, FeGeTe, which exhibits unique structural/magnetic phase transitions, was investigated by Te K-edge extended X-ray absorption fine structure (EXAFS) and Te Kα X-ray fluorescence holography (XFH) over a wide temperature range. The formation of a trimer of Te atoms at low temperatures has been fully explored using these methods. An increase in the Te-Fe distance at approximately 150 K was suggested by EXAFS and presumably indicates the formation of a Te trimer.
View Article and Find Full Text PDFAim: The optimum surgical approach to splenic flexure cancers (SFCs) remains uncertain. The aim of this survey was to explore the opinions of an international surgical community on the management and outcomes of SFC.
Method: A questionnaire was constructed comprising five sections (information about respondents; definition and prognosis of SFC; operative approach; approach in specific scenarios; outcomes) and circulated through an international dissemination committee and social media.