2,263 research outputs found
Method of Monte Carlo grid for data analysis
This paper presents an analysis procedure for experimental data using
theoretical functions generated by Monte Carlo. Applying the classical
chi-square fitting procedure for some multiparameter systems is extremely
difficult due to a lack of an analytical expression for the theoretical
functions describing the system. The proposed algorithm is based on the least
square method using a grid of Monte Carlo generated functions each
corresponding to definite values of the minimization parameters. It is used for
the E742 experiment (TRIUMF, Vancouver, Canada) data analysis with the aim to
extract muonic atom scattering parameters on solid hydrogen.Comment: 16 pages, 10 figures, submitted to NI
Inertia compensation while scanning screw threads on coordinate-measuring machines
Usage of scanning coordinate-measuring machines for inspection of screw
threads has become a common practice nowadays. Compared to touch trigger
probing, scanning capabilities allow to speed up measuring process while still
maintaining high accuracy. However, in some cases accuracy drasticaly depends
on the scanning speed. In this paper a compensation method is proposed allowing
to reduce the influence of some dynamic effects while scanning screw threads on
coordinate-measuring machines
Formation of the vertebral arches of the cervical, thoracic and lumbar vertebrae in early human foetuses
Fusion of the neural arches was studied in 6 serially sectioned human foetuses
aged 9 and 10 weeks. In foetuses of 9 weeks, the completion of arches was
observed in the cervical, upper thoracic, and middle thoracic regions of the
vertebral column. During the 10th week of development, fusion of neural processes
progresses in the lower thoracic and upper three lumbar vertebrae.
(Folia Morphol 2010; 69, 3: 177-179
Innervation of the human cervical and thoracic vertebrae at eight postovulatory weeks
The nerves to the cervical and thoracic vertebrae were traced in 10 serially
sectioned human embryos. It was found that the vertebral bodies receive nerve
fibres from the trunks of the spinal nerves, anterior branches and meningeal
branches of the spinal nerves, and from the sympathetic trunks. Slender twigs
from the trunk of the spinal nerve arise close to the spinal ganglion and terminate
in the posterior and lateral surfaces of the vertebrae. Fibres from the anterior
branches of the spinal nerves terminate in the lateral and anterior surfaces
of the vertebrae. Thin rami from the sympathetic trunk reach the anterior surface
of the vertebrae
The length of the humerus in human embryos at developmental stages 18-23
The length of the humerus was measured in 69 staged human embryos at developmental
stages 18-23 (7 and 8 weeks). It was found that the length of the
humerus increases from 2.0 mm at stage 18 to 5.4 mm at stage 23. There were
slight variations at certain of the stages investigated. Asymmetry between limb
lengths was not found during the embryonic period under examination
Comparison of the Structure of Equation Systems and the GPU Multifrontal Solver for Finite Difference, Collocation and Finite Element Method
AbstractThe article is an in-depth comparison of numerical solvers and corresponding solution pro- cesses of the systems of algebraic equations resulting from finite difference, collocation, and finite element approximations. The paper considers recently developed isogeometric versions of the collocation and finite element methods, employing B-splines for the computations and ensuring Cp−1 continuity on the borders of elements for the B-splines of the order p. For solving the systems, we use our GPU implementation of the state-of-the-art parallel multifrontal solver, which leverages modern GPU architectures and allows to reduce the complexity. We analyze the structures of linear equation systems resulting from each of the methods and how different matrix structures lead to different multifrontal solver elimination trees. The paper also considers the flows of multifrontal solver depending on the originally employed method
The development of the epidural space in human embryos
The epidural space is seen in embryos at stage 17 (41 days) on the periphery of
the primary meninx. During stage 18 (44 days) the dura mater proper appears
and the epidural space is located between this meninx and the perichondrium
and contains blood vessels. During the last week of the embryonic period (stages
20–23) the epidural space is evident around the circumference of the spinal
cord. On the posterior surface it is found between the dura mater and the mesoderm
of the dorsal body wall
Monte Carlo Fitting Of Data From Muon Catalyzed Fusion Experiments In Solid Hydrogen
Applying the classical chi-square fitting procedure for multiparameter systems is in somecases extremely difficult due to the lack of an analytical expression for the theoretical functionsdescribing the system. This paper presents an analysis procedure for experimental datausing theoretical functions generated by Monte Carlo method, each corresponding to definitevalues of the minimization parameters. It was applied for the E742 experiment (TRIUMF,Vancouver, Canada) data analysis with the aim to analyze data from Muon Catalyzed Fusionexperiments (extraction muonic atom scattering parameters and parameters of pd fusion inpdμ molecule)
Early trabeculation and closure of the interventricular foramen in staged human embryos
Internal differentiation of the ventricles was studied in staged serially sectioned
human embryos of developmental stages 13-19 (postovulatory days 32-46).
At stage 13 the trabeculation of both ventricles was advanced and the muscular
part of the interventricular septum well marked. Dorsal and ventral endocardial
cushions were fused and the atrioventricular canal was divided into two
parts. In embryos at stage 18 the membranous interventricular septum was
developing and the interventricular foramen was obliterated. At stage 19 the
membranous part of the interventricular septum was becoming more cellular
in structure. (Folia Morphol 2008; 67: 13–18
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