Geometrical parameters of the individual myocardial fibers

1972 ◽  
Vol 34 (2) ◽  
pp. 205-211 ◽  
Author(s):  
P. C. Voukydis
Keyword(s):  
Geometrical Parameters ◽  
Myocardial Fibers ◽  
The Individual

scholarly journals Model of a Precessing Jet in 3C 279

1998 ◽  
Vol 164 ◽  
pp. 47-48 ◽  
Author(s):  
Z. Abraham ◽  
E.A. Carrara ◽  
J.A. Zensus
Keyword(s):  
Lorentz Factor ◽  
Line Of Sight ◽  
Geometrical Parameters ◽  
X Ray ◽  
Maximum Value ◽  
Doppler Factor ◽  
The Individual ◽  
Relativistic Particles

AbstractThe parsec scale radio jet of 3C 279 presents a number of superluminal features that move along straight trajectories with constant velocities. The position angles P.A. of these trajectories, projected in the plane of the sky, and the velocities βobs of the individual components are different. We interpret the differences in the these velocities as differences in the angle between the jet and the line of sight and apply the model of a precessing beam to the data. All the geometrical parameters of the precessing jet and the Lorentz factor γ of the relativistic particles are determined. The model predicts the behavior of the Doppler factor δ as a function of time and we verify that its maximum value occurred at the epochs in which strong optical and X-ray flares were observed.

scholarly journals Fatigue assessment in welded joints based on geometrical variations measured by laser scanning

2020 ◽  
Vol 64 (11) ◽  
pp. 1825-1831
Author(s):  
Gustav Hultgren ◽  
Zuheir Barsoum
Keyword(s):  
Fatigue Life ◽  
Laser Scanning ◽  
Fatigue Crack Initiation ◽  
Fracture Initiation ◽  
Model Parameters ◽  
Geometrical Parameters ◽  
Leg Length ◽  
Weld Geometry ◽  
Continuous Geometry ◽  
The Individual

Abstract In the current study a method to determine the location of fracture initiation for non-load carrying fillet welds based on continuous geometry measurements is proposed. Measurements and weld quality evaluation were carried out on welded specimens using the Winteria® software qWeld. One hundred nineteen specimens were produced, scanned, and fatigue tested until failure. The fracture surfaces have been investigated in order to find the location(s) for most probable point(s) of initiation. These data were then used to fit the proposed model parameters used to predict the point of initiation. Local weld geometry measurements were extracted from the predicted fracture initiation location(s) to analyse the correlation between local weld geometry and fatigue life. It was observed that fatigue life and leg length were positively correlated and that strong correlations exist between the individual geometrical parameters with regard to location of the fatigue crack initiation.

Tunable Multimode Filtering of Solid Acoustic Waves in a Three-Component Phononic Crystal Slab

2010 ◽  
Vol 150-151 ◽  
pp. 1625-1639
Author(s):  
Jing Li
Keyword(s):  
Longitudinal Wave ◽  
Acoustic Waves ◽  
Negative Refraction ◽  
Phononic Crystal ◽  
Wave Mode ◽  
Geometrical Parameters ◽  
Transverse Waves ◽  
Propagation Behavior ◽  
The Individual ◽  
Negative Refractions

Using of the multiple scattering methods, we characterize the positive and negative multi-refraction and transmission properties of a solid-based phononic crystal composed of coated solid inclusions in view of its applications in tunable multimode filtering. The geometrical parameters are chosen so that a left-handed longitudinal wave mode and a right-handed transverse wave mode, are simultaneously obtained in this three-component phononic crystal. When multimode Gaussian beams are placed transmitting through the phononic crystal slab, both positive and negative refractions are observed. We then study the individual propagation behavior of different modes. The angle dependent transmission beams with different energy distributions are found at the other side of the slab. Transmitted transverse waves coming from different directions incidence finally walk together into four oriented beams. Meanwhile, longitudinal wave incidence with different directions behaves simply as negative refraction in the slab. A far-field longitudinal wave image can be achieved being excited by a longitudinal wave point source. The three-component phononic crystal slab thus can be served as an alternate in tunable multimode filtering devices.

scholarly journals Thermal and Photophysical Studies of Binary Mixtures of Liquid Crystal with Different Geometrical Mesogens

Crystals ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 223 ◽  
Author(s):  
Omaima A. Alhaddad ◽  
Hoda A. Ahmed ◽  
Mohamed Hagar ◽  
Gamal R. Saad ◽  
Khulood A. Abu Al-Ola ◽  
...  
Keyword(s):  
Binary Mixtures ◽  
Density Functional ◽  
Binary Systems ◽  
Uv Spectroscopy ◽  
Twist Angle ◽  
Optical Microscope ◽  
Geometrical Parameters ◽  
Scanning Calorimetry ◽  
Photophysical Studies ◽  
The Individual

Three binary systems were prepared by mixing of two different mesogenic derivatives, homologues, the first is azo/ester, namely 4-alkoxyphenylazo-4′-phenyl-4″-alkoxybenzoates (IIn+m) and the second is Schiff base/ester, namely 4-(arylideneamino)phenyl-4″-alkoxy benzoates (In+m). The two corresponding analogues from both series in the binary mixtures investigated are of the same terminal alkoxy chain length. Mesomorphic properties were investigated by differential scanning calorimetry (DSC) and phases identified by polarized optical microscope (POM). Photophysical studies were investigated by UV spectroscopy connected to a hot stage. Results were discussed based on constructed binary phase diagrams. All mixtures were found to exhibit eutectic compositions, with linear or slightly linear nematic and smectic A stability/composition dependences. Geometrical parameters were predicted applying density functional theory (DFT) calculations. Twist angle (θ), aspect ratio, dipole moment and the polarizability of the individual compounds were discussed and correlated with the experimental results to illustrate the enhanced the mesophase stability and the mesophase range of the mixture at the eutectic composition compared with those of their individual components.

Microscopic Investigation of Quartz Fiber Fabrics: Geometry Model

2011 ◽  
Vol 332-334 ◽  
pp. 791-794
Author(s):  
Yan Lv ◽  
Li Chen ◽  
Fei Sun
Keyword(s):  
Cross Section ◽  
Structural Parameters ◽  
Geometrical Model ◽  
Microscopic Investigation ◽  
Woven Fabrics ◽  
Woven Fabric ◽  
Geometrical Parameters ◽  
Sem Image ◽  
Geometry Model ◽  
The Individual

In response to the relationship between perform structural parameters and the composites properties, a newly geometrical modeling of 2D biaxial orthogonal woven fabric was established in this paper. Based on the yarn’s true configuration, the SEM image of the yarn cross-section was taken, geometrical parameters (the individual tow geometry and weaving pattern of the fabrics) are introduced in order to describe the general families of woven fabrics. The tow waviness can be described by combinations between undulated and straight segments and the tow cross-section can be described by lenticular shape. When the geometrical model was used to predict the structural properties of the fabric, the predicted values show good agreement with the measured ones. The geometrical model proposed here is intended as the foundation for further design and analytical of the mechanical properties of the composite materials reinforced with these fabrics.

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