scholarly journals Periodic Orbits in Three-Armed Galaxies

1999 ◽  
Vol 172 ◽  
pp. 393-394
Author(s):  
Preben J. Grosbøl ◽  
Panos A. Patsis
Keyword(s):  
Rotation Curve ◽  
Spiral Galaxies ◽  
Rotational Velocity ◽  
Mean Value ◽  
Stellar Disk ◽  
The Face ◽  
The Mean ◽  
Spiral Structures ◽  
Armed Spiral ◽  
K Band

Although interarm features in the Population I disk of spiral galaxies frequently give an impression of a three-fold symmetry (Patsis et al., 1997), true three-armed spiral structures in the old stellar disk are seldomly seen. Such systems are of special interest since they display unique conditions which favor the growth of m=3 modes. The face-on spiral NGC 7137 shows a clear three-armed pattern on K-band images and was used as a prototype for the potential of these systems.A K-band map of NGC 7137 was decomposed in axisymmetric components and a synthetic rotation curve was generated [see (Grosbøl and Patsis, 1998)]. The maximum rotational velocity was taken to be ≈150 km sec−1 corresponding to the mean value given by (Rubin et al., 1982) for this type of galaxy.

scholarly journals ‘Scraggy’ dark haloes around bulge-less spiral

2019 ◽  
Vol 486 (3) ◽  
pp. 3697-3701 ◽  
Author(s):  
I D Karachentsev ◽  
V E Karachentseva
Keyword(s):  
Total Mass ◽  
Spiral Galaxies ◽  
Stellar Mass ◽  
Low Density ◽  
Mean Square ◽  
Velocity Difference ◽  
Orbital Mass ◽  
Local Volume ◽  
The Mean ◽  
K Band

ABSTRACT We use a sample of 220 face-on bulge-less galaxies situated in the low-density environment to estimate their total mass via orbital motions of supposed rare satellites. Our inspection reveals 43 dwarf companions having the mean projected separation of 130 kpc and the mean-square velocity difference of 96 km s−1. For them, we obtain the mean orbital-mass-to-K-band luminosity ratio of 20 ± 3. Seven bulge-less spirals in the Local Volume are also characterized by the low mean ratio, Morb/LK = 22 ± 5. We conclude that bulge-less Sc–Scd–Sd galaxies have poor dark haloes, about two times lower than that of bulgy spiral galaxies of the same stellar mass.

scholarly journals Pengaruh Pendidikan Kesehatan Terhadap Kecemasan Primigravida Trimester III

2017 ◽  
Vol 13 (2) ◽  
pp. 210-216
Author(s):  
Vitria Komala Sari ◽  
Wiwik Kusumawati ◽  
Herlin Fitriana
Keyword(s):  
Pregnant Woman ◽  
Health Education ◽  
Sampling Technique ◽  
Mean Value ◽  
Bivariate Analysis ◽  
P Value ◽  
Consecutive Sampling ◽  
The Face ◽  
The Mean ◽  
Anxiety Levels

The purpose of this study is to describe the anxiety levels in primigravida in the face of deliveries at the health center of Bukittinggi. This type of research is experimental with pre-experimental design using a one-group pretest-posttest with consecutive sampling technique. Data collection techniques used questionnaires anxiety level of the Zung Self Rating Anxiety Scale. Results of the study showed a mean value of bivariate analysis on a pregnant woman before being given health education (pretest) = and the mean value after a given health (posttest) = which shows the p value = 0,000 which means there is the influence of health education on anxiety primigravida.

scholarly journals Rotation curves of high-luminosity spiral galaxies and the rotation curve of our galaxy

1979 ◽  
Vol 84 ◽  
pp. 211-220 ◽  
Author(s):  
Vera C. Rubin
Keyword(s):  
Rotation Curve ◽  
Spiral Galaxies ◽  
Rotational Velocity ◽  
Density Wave ◽  
Wave Theory ◽  
High Luminosity ◽  
Rotation Curves ◽  
Flat Rotation Curve ◽  
Density Wave Theory ◽  
Spiral Arm

Rotation curves of high luminosity spiral galaxies are flat, to distances as great as r=49 kpc. This implies a significant mass at large r. Rotational velocities increase about 20 km/s across a spiral arm, as predicted by the density wave theory. By analogy, it is suggested that our Galaxy has a flat rotation curve out to r∼60 kpc, with V ∼ constant at near the solar rotational velocity, and m ∼7×1011 m⊙. Values of A and B imply that the sun is not located in a spiral arm.

scholarly journals Periodic Orbits and Gas Flow in Barred Spiral Galaxies

1983 ◽  
Vol 100 ◽  
pp. 221-224
Author(s):  
R. H. Sanders ◽  
P. J. Teuben ◽  
G. D. van Albada
Keyword(s):  
Gas Flow ◽  
Rotation Curve ◽  
Spiral Galaxies ◽  
Radial Force ◽  
List Type ◽  
Type Number ◽  
Lagrange Points ◽  
Barred Galaxies ◽  
The Mean ◽  
Barred Spiral Galaxies

One purpose for studying the gas flow in barred spiral galaxies is to use the observed distribution and kinematics of the gas as a tracer of the underlying gravitational field. By comparing model hydrodynamical calculations with observations of actual systems, one would like to define three basic properties of barred galaxies: 1)The bar strength. How significant is the deviation from axial symmetry in the region of the bar, measured by some parameter such as qt, maximum aximuthal force in terms of the mean radial force (Sanders and Tubbs, 1980).2)The mean radial distribution of matter. Clearly in a system with large deviations from circular motion, the “rotation curve” gives no direct information on the radial mass distribution.3)The angular velocity of the bar. Where is the co-rotation radius (or Lagrange points) with respect to the bar axes? Are other principal resonances present?

scholarly journals Perbandinganantaratekniktwodot dengananalisis sefalometri pada pengukuran dimensi vertikal oklusi (Comparison between two dot technique with cephalometric analysis on the measurement of the vertical dimension of occlusion)

2014 ◽  
Vol 13 (3) ◽  
pp. 141
Author(s):  
Muhammad Nurung ◽  
Moh. Dharmautama ◽  
Eri H. Jubhari ◽  
Eka Erwansyah
Keyword(s):  
Practical Knowledge ◽  
Mean Value ◽  
Vertical Dimension ◽  
Cephalometric Analysis ◽  
Research Subjects ◽  
Mandibular Plane ◽  
Dental Hospital ◽  
The Face ◽  
The Mean ◽  
Vertical Height

The vertical dimension can be described as a vertical height of the face. Practical knowledge about the physiologicalrest position is very important in determining the vertical dimension of occlusion (VDO) accurately. DeterminationVDO is one tough stage of prosthodontic treatment. There is no method or tool that can measure VDO accurately. Thisstudy can be used by dentists to help evaluate the results of VDO measurement performed by two dot technique, soconvincing dentists that the measurements are accurate. The distance was measured after the the two points on the tipof the nose and the tip of the chin assess, while DVO on the photo cephalometric measured by assessing the angle ofthe bispinal plane (SNA-SNP) with mandibular plane (Go-Gn), then OVD of cephalometric imaging was comparedwith compare the results of photo DVO cephalometric by two dots technique were measuring with Moyers standard.Based on research conducted at Dental Hospital University of Hasanuddin, there were obtained 20 samples that met the criteria as research subjects. Measuring DVO on the cephalometric photo, the mean value obtained on men20.214°and women 22.231°, insignificant statistically. It was concluded that the mean value of DVO corner was21.52°, still in the range of Moyers value with range 9-32°.

scholarly journals Estimation of Cosmological Constant of Nearby Spiral Galaxies using Rotation Curve

1970 ◽  
Vol 8 (8) ◽  
pp. 15-18
Author(s):  
RK Bachhan ◽  
B Aryal ◽  
U Khanal
Keyword(s):  
Cosmological Constant ◽  
Rotation Curve ◽  
Spiral Galaxies ◽  
Rotational Velocity ◽  
De Sitter Space ◽  
Accelerating Universe ◽  
De Sitter ◽  
Solar Mass ◽  
Central Mass ◽  
Barred Spiral Galaxies

An expression for rotational velocity of a test particle around the central mass in the invariant plane is derived. For this, a line element of Schwarzschild de-Sitter space-time is used to study the effect of cosmological constant Λ) on the motion of both massive and mass-less particles in the Universe. This expression is fitted for the mass and Λ. For this, the total mass M is divided into the mass of the black hole MB and a uniform sphere of radius r dominated by dust (ρd) which is supposed to vary as [please see full text PDF for the formula]. Using rotation curve data of 6 nearby spiral and barred spiral galaxies, we estimated the value of Λ and the mass of the galaxy. The cosmological constant (Λ) is found to be positive for all 6 galaxies. The positive Λ reveals the importance of de Sitter space, suggesting accelerating Universe. The cosmological constant (Λ) and the density (ρo) are found to lie in the range 1.269 x 10-41 to 9.490 x 10-42 km-2, and 7.044 x 10-9 to 3.250 x 10-8 km-1, respectively. The mass MB is found in the range 1.867 x 107 to 1.730 x 1010 solar mass. Our result shows a good agreement with the results of supernova project which gives positive Λ value, suggesting accelerating Universe.Keywords: Galaxies formation; General astronomical databases.DOI: 10.3126/sw.v8i8.3840  Scientific World Vol.8(8) 2010 pp.15-18 

Long-period modulated superstructures in Pd-12.5 at.%Ce and Pd-15 at.%Ce alloys

1990 ◽  
Vol 48 (4) ◽  
pp. 164-165
Author(s):  
Noriyuki Kuwano ◽  
Masaru Itakura ◽  
Kensuke Oki
Keyword(s):  
Electron Microscopy ◽  
Mean Value ◽  
Heavy Elements ◽  
Arc Furnace ◽  
X Ray ◽  
Long Period ◽  
Ultra High Purity ◽  
Heat Treated ◽  
Atomic Scattering ◽  
The Mean

Pd-Ce alloys exhibit various anomalies in physical properties due to mixed valences of Ce, and the anomalies are thought to be strongly related with the crystal structures. Since Pd and Ce are both heavy elements, relative magnitudes of (fcc-fpd) are so small compared with <f> that superlattice reflections, even if any, sometimes cannot be detected in conventional x-ray powder patterns, where fee and fpd are atomic scattering factors of Ce and Pd, and <f> the mean value in the crystal. However, superlattices in Pd-Ce alloys can be analyzed by electron microscopy, thanks to the high detectability of electron diffraction. In this work, we investigated modulated superstructures in alloys with 12.5 and 15.0 at.%Ce.Ingots of Pd-Ce alloys were prepared in an arc furnace under atmosphere of ultra high purity argon. The disc specimens cut out from the ingots were heat-treated in vacuum and electrothinned to electron transparency by a jet method.

Partition Coefficient Ratios and Tumour Perfusion Studied with 85mKr and 133Xe

1987 ◽  
Vol 26 (06) ◽  
pp. 253-257
Author(s):  
M. Mäntylä ◽  
J. Perkkiö ◽  
J. Heikkonen
Keyword(s):  
Partition Coefficient ◽  
Partition Coefficients ◽  
Regional Blood Flow ◽  
Blood Perfusion ◽  
Compartmental Analysis ◽  
Malignant Tumour ◽  
Mean Value ◽  
Perfusion Rate ◽  
Biological Variables ◽  
The Mean

The relative partition coefficients of krypton and xenon, and the regional blood flow in 27 superficial malignant tumour nodules in 22 patients with diagnosed tumours were measured using the 85mKr- and 133Xe-clearance method. In order to minimize the effect of biological variables on the measurements the radionuclides were injected simultaneously into the tumour. The distribution of the radiotracers was assumed to be in equilibrium at the beginning of the experiment. The blood perfusion was calculated by fitting a two-exponential function to the measuring points. The mean value of the perfusion rate calculated from the xenon results was 13 ± 10 ml/(100 g-min) [range 3 to 38 ml/(100 g-min)] and from the krypton results 19 ± 11 ml/(100 g-min) [range 5 to 45 ml/(100 g-min)]. These values were obtained, if the partition coefficients are equal to one. The equations obtained by using compartmental analysis were used for the calculation of the relative partition coefficient of krypton and xenon. The partition coefficient of krypton was found to be slightly smaller than that of xenon, which may be due to its smaller molecular weight.

Detection of Soluble Fibrin Monomer Complexes in Blood by Means of Protamine Sulphate Test

1968 ◽  
Vol 20 (01/02) ◽  
pp. 044-049 ◽  
Author(s):  
B Lipiński ◽  
K Worowski
Keyword(s):  
Human Subjects ◽  
Coronary Thrombosis ◽  
Mean Value ◽  
Healthy Human ◽  
Protamine Sulphate ◽  
Soluble Fibrin ◽  
Fibrin Monomer ◽  
Dog Plasma ◽  
The Mean ◽  
Precipitable Protein

SummaryIn the present paper described is a simple test for detecting soluble fibrin monomer complexes (SFMC) in blood. The test consists in mixing 1% protamine sulphate with diluted oxalated plasma or serum and reading the optical density at 6190 Å. In experiments with dog plasma, enriched with soluble fibrin complexes, it was shown that OD read in PS test is proportional to the amount of fibrin recovered from the precipitate. It was found that SFMC level in plasma increases in rabbits infused intravenously with thrombin and decreases after injection of plasmin with streptokinase. In both cases PS precipitable protein in serum is elevated indicating enhanced fibrinolysis. In healthy human subjects the mean value of OD readings in plasma and sera were found to be 0.30 and 0.11, while in patients with coronary thrombosis they are 0.64 and 0.05 respectively. The origin of SFMC in circulation under physiological and pathological conditions is discussed.

Detection of Circulating Tissue Factor and Factor VII in a Normal Population

1996 ◽  
Vol 75 (05) ◽  
pp. 772-777 ◽  
Author(s):  
Sybille Albrecht ◽  
Matthias Kotzsch ◽  
Gabriele Siegert ◽  
Thomas Luther ◽  
Heinz Großmann ◽  
...  
Keyword(s):  
Tissue Factor ◽  
Normal Population ◽  
Mean Value ◽  
Factor Vii ◽  
Significant Difference ◽  
Age Dependent ◽  
The Mean ◽  
Highly Correlated ◽  
And Gender

SummaryThe plasma tissue factor (TF) concentration was correlated to factor VII concentration (FVIIag) and factor VII activity (FVIIc) in 498 healthy volunteers ranging in age from 17 to 64 years. Immunoassays using monoclonal antibodies (mAbs) were developed for the determination of TF and FVIIag in plasma. The mAbs and the test systems were characterized. The mean value of the TF concentration was 172 ± 135 pg/ml. TF showed no age- and gender-related differences. For the total population, FVIIc, determined by a clotting test, was 110 ± 15% and the factor VIlag was 0.77 ± 0.19 μg/ml. FVII activity was significantly increased with age, whereas the concentration demonstrated no correlation to age in this population. FVII concentration is highly correlated with the activity as measured by clotting assay using rabbit thromboplastin. The ratio between FVIIc and FVIIag was not age-dependent, but demonstrated a significant difference between men and women. Between TF and FVII we could not detect a correlation.

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