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31.
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Assiotis Theodoros Gunes Mustafa Alper Soor Arun 《Mathematical Physics, Analysis and Geometry》2022,25(2):1-33
Mathematical Physics, Analysis and Geometry - Thanks to the Birman-Schwinger principle, Weyl’s laws for Birman-Schwinger operators yields semiclassical Weyl’s laws for the corresponding... 相似文献
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Dr. Vitali Tugarinov Dr. Theodoros K. Karamanos Dr. Alberto Ceccon Dr. G. Marius Clore 《Chemphyschem》2020,21(1):13-19
Optimized NMR experiments are developed for isolating magnetization belonging to the I=1/2 manifolds of 13CH3 methyl groups in proteins, enabling the manipulation of the magnetization of a 13CH3 moiety as if it were an AX (1H-13C) spin-system. These experiments result in the same ‘simplification’ of a 13CH3 spin-system that would be obtained from the production of {13CHD2}-methyl-labeled protein samples. The sensitivity of I=1/2 manifold-selection experiments is a factor of approximately 2 less than that of the corresponding experiments acquired on {13CHD2}-labeled methyl groups. The methodology described here is primarily intended for small-to-medium sized proteins, where the losses in sensitivity associated with the isolation of I=1/2 manifold transitions can be tolerated. Several NMR applications that benefit from simplification of the 13CH3 (AX3) spin-systems are described, with an emphasis on the measurements of methyl 1H-13C residual dipolar couplings in a {13CH3}-methyl-labeled deletion mutant of the human chaperone DNAJB6b, where modulation of NMR signal intensities due to evolution of methyl 1H-13C scalar and dipolar couplings follows a simple cosine function characteristic of an AX (1H-13C) spin-system, significantly simplifying data analysis. 相似文献
35.
Andreas Sofetis Fotini Fotopoulou Catherine P. Raptopoulou Theodoros F. Zafiropoulos Spyros P. Perlepes Nikolaos Klouras 《Polyhedron》2009
The reaction of [TiIV(Cp)2Cl2] (Cp− = η5-C5H5−) and 2,6-bis(3,5-dimethylpyrazolyl-1-yl)pyridine (bdmpp) in Me2CO has afforded complex [TiIVCl2(O2)(bdmpp)] (1). The complex can also be prepared from the 1:1:1 [Ti(Cp)2Cl2]/bdmpp/H2O2 reaction mixture in various solvents. Single-crystal, X-ray crystallography has revealed that the TiIV center is in a distorted pentagonal bipyramidal environment in both of the two, crystallographically independent molecules that are present in the asymmetric unit; the equatorial positions are occupied by the two O atoms of the side-on (η2) O22− group and the three N-atoms of the tridentate chelate, while the two chloro ligands are on the axial positions. IR, Raman, electronic and 1H NMR data are discussed in terms of the known structure and the coordination modes of the peroxo and bdmpp ligands. 相似文献
36.
Anne E. Vertigan Deborah G. Theodoros Peter G. Gibson Alison L. Winkworth 《Journal of voice》2006,20(3):466-480
SUMMARY: Chronic cough (CC) and paradoxical vocal fold movement (PVFM) are debilitating conditions. PVFM has been given many labels, including vocal cord dysfunction, Munchausen's stridor, functional inspiratory stridor, nonorganic functional or psychogenic upper airway obstruction, factitious asthma, psychogenic stridor, emotional laryngeal wheezing, and episodic laryngeal dyskinesia. Although CC and PVFM have been considered separate entities in many reports, there is preliminary support for the notion that there may be an underlying link between these two conditions. Speech pathologists have become increasingly involved in the treatment of these patients and therefore need to understand the theoretical background of these disorders, the pathophysiological links between the two, and the impact of voice disorders on these populations. The aim of this article is to review the current literature on CC and PVFM from a speech pathology perspective to provide a model for defining and conceptualizing the disorders and to provide a framework for management and future research. 相似文献
37.
We present a class of first and second order in space and time relaxation schemes for the shallow water (SW) equations. A new approach of incorporating the geometrical source term in the relaxation model is also presented. The schemes are based on classical relaxation models combined with Runge–Kutta time stepping mechanisms. Numerical results are presented for several benchmark test problems with or without the source term present. Copyright © 2003 John Wiley & Sons, Ltd. 相似文献
38.
Evaluating the relative time displacement of the two orthogonally polarized components of a pulse propagating down a birefringent optical fiber is considered. A method that provides analytical expressions for this time displacement is described and generalizes analytical results already published. 相似文献
39.
Antonios Lalas Nikolaos Kantartzis Theodoros Tsiboukis 《Applied Physics A: Materials Science & Processing》2014,115(2):433-438
We report on the application of various optimization methods as a very promising simulation approach for the design of true integrated optical devices by means of inverse design. We show that these techniques provide a global optimum toward one or various functional objectives at a reasonable computational cost. The results obtained by these methods are far better than intuitive design procedures and clearly outperform trial-and-error based models. We illustrate their performance by using a series of inverse-designed practical photonic devices. 相似文献
40.
Theodoros Vlachos 《Geometriae Dedicata》1997,68(1):73-78
We use the maximum principle for second-order elliptic operators to establish a sufficient condition for a compact hypersurface in a space form to be a geodesic sphere in terms of a pinching for the s-mean curvature. 相似文献