The isotropic hyperfine coupling (hfs) constants of the muonium substituted ethyl radical CH
2MuCH
2 have been studied at
T
=
25 K by a Feynman path integral Monte Carlo (PIMC)–density functional ...(DFT) formalism. The DFT Hamiltonian employed is of the B3LYP–EPRIII type. The hfs constants of the rotationally hindered CH
2MuCH
2 isomer have been compared with the hfs constants of C
2H
5 which exhibits free internal rotation. The dissimilar rotational dynamics in both radicals leads to significant differences between some of the isotropic hfs parameters. The PIMC results show the strong coupling between nuclear fluctuations and calculated hfs constants.
A pilot study was carried out to test the feasibility of an adjustable computerized brain atlas, adapted to the individual anatomy for localizing current dipoles by means of magnetoencephalography ...(MEG). The atlas can be adapted to individual computed tomography (CT) or magnetic resonance (MR) images. Position information is transferred between these imaging methods and MEG using a stereotactic technique. For this purpose, a special non-magnetic helmet was designed to be used together with the ordinary head fixation system. It seems likely that the proposed combination of the brain atlas with MEG, CT and MRI methods will become a powerful tool in exploring different brain functions.
The interpretation of functional neuroimaging data can in many cases be facilitated by comparisons with simulated data corresponding to the measuring situation. A computerized brain atlas is used to ...provide information regarding the spatial extent of the object being imaged. This knowledge combined with information about the resolution of the imaging device expressed as point spread functions is used to calculate a simulated image of the object. This image can be regarded as a generalized region of interest (ROI) containing information of the object as viewed by the specific instrument. Generalized ROIs are used to automatically determine boundaries of ordinary ROIs and to provide recovery coefficients to compensate for partial volume effects. Simulations can also be used to generate three-dimensional data sets where different uptake levels have been assigned to different anatomical structures.< >
The intent of this research is to establish an accurate time-line of prominent Indian mathematicians and/or astronomers. Inaccuracies and miscalculations dating these scholars have caused much of the ...controversy regarding their contributions. The following chapters provide the correct time frame as to their era as well as the proofs for formulas that have been attributed to later mathematicians. Chapter One introduces how concepts and interpretations of Sanskrit literature influence relevant theories practiced by the scholars noted in later chapters. It also provides information as to how miscalculations dating pertinent historical events perpetuated the misconceptions that mathematicians from later eras first introduced many of the current theories. The second chapter provides a brief history and geography of the ancient landmasses. One must acknowledge that geographical changes and migrating patterns greatly impact present day society. What was once known as Jambudvipa no longer exists today, although the concepts and theorems remain with us always. Chapters Three through Eight pertain to the prominent mathematicians and/or astronomers and their most significant contributions to modern day theory. These contributions have greatly enhanced our modern day theories.
