scholarly journals Study of Spatial Orientation of Angular Momentum of z-Magnitude SDSS DR-13 Galaxies with Red Shift 0.50 to 0.53

2021 ◽  
Vol 26 (1) ◽  
pp. 1-7
Author(s):  
Shiv Narayan Yadav ◽  
Santosh Kumar Sah
Keyword(s):  
Angular Momentum ◽  
Statistical Tests ◽  
Three Dimensional ◽  
Red Shift ◽  
Angular Momentum Vector ◽  
Initial Alignment ◽  
Chi Square ◽  
Local Anisotropy ◽  
Hierarchy Model ◽  
Merging Process

The spatial orientations of 142,929 SDSS DR-13, z- magnitude galaxies having red shift 0.50 to 0.53 have been analyzed. The main goal of this work is to examine the orientation of the angular momentum of galaxies within the given redshift limit in the framework of three different scenarios 'Hierarchy model', 'Pancake model', and the 'Primordial vorticity model'.  By using Godlowskian transformation the two-dimensional data were converted into three-dimensional data (polar and azimuthal angles). The expected isotropy distribution curves were obtained by removing the selection effects and performing a random simulation to generate 107 virtual galaxies by using Matlab 2015a. Three statistical tests of Chi-square, autocorrelation, and Fourier were used to compare the expected isotropic data with observed. The data classified into nine subsamples having each of one magnitude size. In general, the results supported the Hierarchy model. The model advocates random orientations of angular. However, a local anisotropy observed in few subsamples suggested a gravitational tidal interaction between neighboring galaxies, an early-merging process in which the angular momentum vector distorts the initial alignment of nearby galaxies.

scholarly journals A Study of r- and u-Magnitude Dependence in the Spatial Orientation of Spin Vectors of SDSS Galaxies having redshift 0.10 < z < 0.11

2015 ◽  
Vol 5 ◽  
pp. 1-11
Author(s):  
Shiv Narayan Yadav ◽  
Binil Aryal
Keyword(s):  
Galaxy Formation ◽  
Spatial Orientation ◽  
Three Dimensional ◽  
Simulation Method ◽  
Sloan Digital Sky Survey ◽  
Angular Momentum Vector ◽  
Spin Vector ◽  
Local Anisotropy ◽  
Rotation Axes ◽  
Merging Process

We present a study of spin vector orientations of 44749 r and u-magnitude SDSS (Sloan Digital Sky Survey) galaxies having redshift 0.10 to 0.11. The r and u-magnitudes are observed through 616.5 nm and 354.3 nm CCD (charge coupled device) filter attached to SDSS telescope located at New Mexico, USA. We have converted two dimensional data to three dimensional galaxy rotation axes. Our aim is to find out non-random effects in the spatial orientation of galaxies. In addition, we wanted to check r and u-magnitude dependence in the spatial orientation. The expected isotropy distribution curves are obtained by removing the selection effects and performing a random simulation method. In general, spin vector orientations of galaxies is found to be random, supporting Hierarchy model of galaxy formation. A local anisotropy is observed in few samples suggesting a gravitational tidal interaction between neighbor galaxies, a merging process in which the angular momentum vector distort the original alignment of evolution of rotational supported system to the randomized system.The Himalayan Physics Year 5, Vol. 5, Kartik 2071 (Nov 2014)Page: 1-11

scholarly journals Preferred Alignments of Angular Momentum Vectors of Galaxies in the SDSS Supercluster S[202-001+0084]

NUTA Journal ◽  
2019 ◽  
Vol 6 (1-2) ◽  
pp. 12-17
Author(s):  
Janak Ratna Malla ◽  
Binil Aryal ◽  
Walter Saurer
Keyword(s):  
Angular Momentum ◽  
Galaxy Formation ◽  
Particle Physics ◽  
Statistical Tests ◽  
Three Dimensional ◽  
Sloan Digital Sky Survey ◽  
Sky Survey ◽  
Hierarchy Model ◽  
Vector Orientation ◽  
Almost All

We present a study of spin vector orientation of 1331 SDSS (Sloan Digital Sky Survey) galaxies in SDSS Supercluster S[202-001+0084] having redshift 0.02 to 0.03. The data are provided by our collaborator, Institute of Astro-particle Physics, Innsbruck University, Austria. We have converted two dimensional data to three dimensional by Godlowskian Transformation. Our aim is to find out non-random effects in the preferred alignments of angular momentum vectors of galaxies. In general, no preferred alignments angular momentum vectors of galaxies are noticed, supporting Hierarchy model of galaxy formation. In almost all sub samples the 1st order Fourier coefficient suggests that the angular momentum vectors are randomly oriented but other statistical tests suggest anisotropic distribution probably due to the binning effect and gravitational shearing effect.

No preferred alignments of angular momentum vectors of galaxies in the SDSS supercluster S[202-001+0084]

2019 ◽  
Vol 14 (S353) ◽  
pp. 259-261
Author(s):  
Janak R. Malla ◽  
Walter Saurer ◽  
Binil Aryal
Keyword(s):  
Angular Momentum ◽  
Spatial Orientation ◽  
Simulation Method ◽  
Theoretical Distribution ◽  
Selection Effects ◽  
Chi Square ◽  
Random Simulation ◽  
Auto Correlation ◽  
Hierarchy Model

AbstractWe present spatial orientation of angular momentum vectors of 3038 galaxies in the SDSS supercluster S[202-002+0084] having mean redshift 0.084. The selection effects in the database are removed using random simulation method. The observed distributions of angular momentum vectors of galaxies are compared with expected theoretical distribution using chi-square, auto-correlation and Fourier tests. No preferred alignments of angular momentum vectors of galaxies are noticed in the supercluster S[202-001+0084], supporting hierarchy model.

scholarly journals Spatial orientations of angular momentum vectors of galaxies in Supercluster S [173+014+0082]

BIBECHANA ◽  
2021 ◽  
Vol 18 (1) ◽  
pp. 26-32
Author(s):  
Janak Ratna Malla ◽  
Walter Saurer ◽  
B Aryal
Keyword(s):  
Angular Momentum ◽  
Galaxy Formation ◽  
Three Dimensional ◽  
Position Angle ◽  
Sloan Digital Sky Survey ◽  
Chi Square ◽  
Isotropic Distribution ◽  
The Galaxy ◽  
Inclination Angles ◽  
Chi Square Test

The spin vector orientation of 1302 SDSS (Sloan Digital Sky Survey) galaxies in Supercluster S[173+014+0082] having redshift 0.076 to 0.091 has been analysed. The positions, position angles and inclination angles of galaxies are used to convert two-dimensional observed parameters into three-dimensional angular momentum vectors of the galaxy using the `position angle-inclination' method. The expected isotropic distribution curves are determined performing numerical simulation by generating 107 virtual galaxies. The observed distribution is compared with the expected isotropic distribution curves using three statistical tools namely Chi-square test, auto-correlation test and Fourier test. Redshift map is studied and found that the distributions fit with the Gaussian. No preferred alignment of angular momentum vectors is noticed, supporting Hierarchy model of galaxy formation. BIBECHANA 18 (2021) 26-32  

scholarly journals Rocking shadows in broken circumbinary discs

2020 ◽  
Vol 493 (1) ◽  
pp. L143-L147 ◽  
Author(s):  
Rebecca Nealon ◽  
Daniel J Price ◽  
Christophe Pinte
Keyword(s):  
Monte Carlo ◽  
Angular Momentum ◽  
Radiative Transfer ◽  
Three Dimensional ◽  
Angular Momentum Vector ◽  
Momentum Vector ◽  
Over Time ◽  
Three Dimensional Simulations

ABSTRACT We use three-dimensional simulations with coupled hydrodynamics and Monte Carlo radiative transfer to show that shadows cast by the inner disc in broken circumbinary discs move within a confined range of position angles on the outer disc. Over time, shadows appear to rock back and forth in azimuth as the inner disc precesses. The effect occurs because the inner disc precesses around a vector that is not the angular momentum vector of the outer disc. We relate our findings to recent observations of shadows in discs.

scholarly journals Variation of Spatial Orientation with Increase in Red Shift

2018 ◽  
Vol 6 ◽  
pp. 43-46
Author(s):  
Ranjit Prasad Yadav
Keyword(s):  
Statistical Tests ◽  
Random Effect ◽  
Azimuthal Angle ◽  
Position Angle ◽  
Red Shift ◽  
Chi Square ◽  
Rotation Axes ◽  
Isotropic Distribution ◽  
Sky Survey ◽  
The Galaxy

The main aim of this article is to analyze non-random effect s in galaxy orientation. The result is based on the analysis of the spatial orientations of SDSS (Soloan Digital Sky Survey) galaxies of red shift 0.10000 to 0.1001 (radial velocity: 30000km/s to30030km/) using seventh data released in October 2008. The position angle inclination method is used to find the polar and azimuthal angles of galaxy rotation axes. To analyze the distribution of the polar and azimuthal angle of the galaxy rotation axes and to check for an isotropy or anisotropy the three statistical tests have carried out: chi- square, Fourier and auto correlation. It was done assuming the spatially isotropic distribution to examine non-random effects. It was found that the spin vector orientations of the galaxies in the sample Z1 and Z2 are almost isotropic.Academic Voices Vol.6 2016: 43-46

scholarly journals Spatial Orientations of Angular Momentum Vectors of Galaxies in Supercluster S [247+040+0029] and Substructures

2021 ◽  
Vol 7 (1) ◽  
pp. 39-48
Author(s):  
J. R. Malla ◽  
W. Saurer ◽  
B. Aryal
Keyword(s):  
Angular Momentum ◽  
Large Scale ◽  
Statistical Tests ◽  
Selection Effect ◽  
Simulation Method ◽  
Position Angle ◽  
Number Density ◽  
High Concentration ◽  
Chi Square ◽  
Isotropic Distribution

We present an analysis of spatial orientations of 1331 galaxies in the supercluster S [247+040+0029]. The main goal of this work is to search for a new substructure candidate and examine the orientation of angular momentum in the framework of three different scenarios (hierarchy, pancake, and primordial vorticity models) using “position angle-inclination method”, and to test the dependence on magnitude with the angular momentum orientations and their projections. We identified five substructures studying number density contour map with considerably high concentration of galaxies. Using random simulation method to remove the selection effect on database, we carried out expected isotropic distribution using cosmological principle. We then used three statistical tests: Chi-square, Auto-correlation, and Fourier to identify isotropy between observed and expected isotropic distributions. We varied radius in the range 0.3° to 1.0° to find substructures in supercluster. From this we found five sub-structures when taking radius 0.3° and two substructures for 1.0° radius in the number density counter maps of galaxies. By analyzing the result obtained through statistical tests, we are able to conform that evolution of galaxy in the supercluster and substructures supports “Hierarchy model" giving the angular momentum of galaxies in the large scale structure tends to be oriented random with respect to the reference coordinate system.

Comparação de testes coproparasitológicos em criadouro comercial de psitacídeos exóticos

2020 ◽  
Vol 3 (5) ◽  
pp. 100-107
Author(s):  
Marina Camargo de Sousa ◽  
◽  
Julia Ronzani Vial ◽  
Rodrigo Hidalgo Friciello Teixeira ◽  
Andrea Cristina Higa Nakaghi ◽  
...  
Keyword(s):  
Statistical Tests ◽  
Companion Animals ◽  
Clinical Importance ◽  
Breeding Site ◽  
Chi Square ◽  
Fecal Samples ◽  
Breeding Sites ◽  
Specificity And Sensitivity ◽  
Nematode Eggs ◽  
Commercial Breeding

Birds of the psittaciform order, composed by the Psittacidae and Loridae family have several characteristics making them more frequently kept as companion animals, promoting the increase of breeding sites in Brazil. The present study aimed to analyze the specificity and sensitivity of three different coproparasitological tests, Willis, Hoffman and Direto de feces, through statistical tests: Chi-Square and Kappa. 70 fecal samples of exotic parrots were collected from a commercial breeding site and these were submitted to the three tests, totaling 210 coproparasitological exams. Among the tests performed, 29,5% were positive for nematode eggs, cestodes and oocysts. Coproparasitological exams are inexpensive, have clinical importance, indicating the population of endoparasites and therapeutic treatments.

Analisis Faktor Determinan Pelaksanaan Inisiasi Menyusu Dini Oleh Bidan Di Rumah Sakit Umum Anutapura Palu

2018 ◽  
Vol 1 (1) ◽  
pp. 34
Author(s):  
Ni Nyoman Novita ◽  
Gusman Arsyad
Keyword(s):  
Emergency Room ◽  
Peer Support ◽  
Statistical Tests ◽  
Bivariate Analysis ◽  
P Value ◽  
Chi Square ◽  
Cross Sectional ◽  
Implementation Processes ◽  
Chi Square Test ◽  
The Government

Implementation of IMD in hospitals has decreased from the previous year and has not reached the target set by the government. Some IMD implementation processes have not been carried out according to applicable standards. So that babies do not get an IMD in accordance with existing SOPs. The purpose of this study was to determine the determinant factors associated with the implementation of the IMD by midwives in the Midwifery and Maternity Room Emergency Room (IGD) at the Anutapura General Hospital in Palu. This research method is analytical with cross sectional approach. The population of this study was that all midwives in the obstetrics emergency room and maternity room at Anutapura Palu Hospital were 37 respondents. The sample in this study is total sampling. The analysis used was univariate, and bivariate analysis using the chi square test with a confidence level of 95% (α = 0.05). The results of statistical tests on variable knowledge of midwives with the implementation of IMD p value: 0.018 (p value <0.05). APN training with the implementation of IMD p value: 0.697 (p value> 0.05). length of work with the implementation of IMD p value: 0.029 (p value <0.05). and peer support with the implementation of IMD p value: 0.007 (p value <0.05). Conclusions there is a relationship between knowledge, length of work, peer support with the implementation of the IMD, and training factors that have nothing to do with IMD implementation. The strongest factor in the relationship is peer support. It is recommended that the Anutarapura Palu Hospital be able to motivate midwives so that they can further enhance their role in the implementation and provide support to their colleagues so that the implementation of the IMD can be carried out in accordance with applicable standards.Keywords: Knowledge, APN Training, Duration of work, Implementation of IMD

HUBUNGAN ANTARA PENDIDIKAN DAN PEKERJAAN IBU HAMIL DENGAN PEMERIKSAAN KEHAMILAN DI PUSKESMAS MARIANA KECAMATAN BANYUASIN I KABUPATEN BANYUASIN TAHUN 2011

2019 ◽  
Vol 2 (1) ◽  
Author(s):  
Leny Leny
Keyword(s):  
Prenatal Care ◽  
Pregnant Women ◽  
Maternal Education ◽  
Statistical Tests ◽  
Univariate Analysis ◽  
World Health ◽  
P Value ◽  
Chi Square ◽  
Cross Sectional ◽  
Health Organization

ABSTRACT Prenatal care is health care by health personnel to care the pregnant according to standards. Worlrd Health Organization (WHO) estimates more than 500.000 women die during pregnancy or childbirth. Maternal mortality in Indonesia is 307 per 100,000 live births. The quantity of pregnant women’s visit in Kabupaten Banyuasin in 2009 of 89.1%. The purpose of this study to determine the relationship between education and occupation with prenatal care at Puskesmas Mariana  Kecamatan Banyuasin I Kabupaten Banyuasin in 2011. This study uses analytic approach survey by Cross Sectional methods, the population are 1.946 pregnant women and the samples as many as 332 people. The results of univariate analysis study of pregnant women who are higher education as much as 45.2%, and  low maternal education as much as 54.8%. In pregnant women who work of 43.4%, and pregnant women who do not work for 56.6%. From the results of bivariate analysis and Chi-Square statistical tests found a significant association between education of pregnant women with prenatal care with P Value = 0.000, and there was a significant association between occupation of pregnant women with prenatal care with P Value = 0.000. Can be concluded that there is a relationship between education and occupation of pregnant women with prenatal care. Expected to health workers to provide counseling on the importance of prenatal care in pregnant women and expected future studies may explore again the factors associated with prenatal care with the different variables.   ABSTRAK Pemeriksaan kehamilan adalah pelayanan kesehatan oleh tenaga kesehatan untuk memeriksakan ibu hamil sesuai standar. World Health Organization (WHO) memperkirakan lebih dari 500.000 ibu pertahunnya meninggal saat hamil atau bersalin. AKI di Indonesia 307 per 100.000 kelahiran hidup. Jumlah kunjungan ibu hamil di Kabupaten Banyuasin tahun 2009 sebesar 89,1%. Tujuan penelitian ini untuk mengetahui hubungan antara pendidikan dan pekerjaan dengan pemeriksaan kehamilan di Puskesmas Mariana Kecamatan Banyuasin I Kabupaten Banyuasin tahun  2011. Penelitian ini menggunakan metode survey analitik dengan pendekatan Cross Sectional, populasi ibu hamil dengan jumlah 1.946 orang dan jumlah sampel sebanyak 332 orang. Hasil penelitian Analisa Univariat adalah ibu hamil yang pendidikan tinggi sebanyak 45,2%, dan pendidikan rendah ibu hamil sebanyak 54,8%. Pada variabel pekerjaan ibu hamil yang bekerja sebesar 43,4%, dan ibu hamil yang tidak bekerja sebesar 56,6%. Dari hasil analisa bivariat dan uji statistik Chi-Square  didapatkan hubungan yang bermakna antara pendidikan ibu hamil dengan pemeriksaan kehamilan dengan  P Value = 0,000, dan ada hubungan yang bermakna antara pekerjaan ibu hamil dengan pemeriksaan kehamilan dengan P Value = 0,000. Dapat disimpulkan bahwa ada hubungan antara pendidikan dan pekerjaan ibu hamil dengan pemeriksaan kehamilan. Diharapkan kepada petugas kesehatan agar dapat memberikan penyuluhan tentang pentingnya pemeriksaan pada ibu hamil dan diharapkan penelitian yang akan datang dapat menggali lagi faktor-faktor yang berhubungan dengan pemeriksaan kehamilan dengan variabel yang berbeda.

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