Results 101 to 110 of about 24,207 (210)

Slow Frequency-Hopping Multicarrier DS-CDMA for Transmission over Nakagami Multipath Fading Channels

, 2001
A novel multiple access scheme based on slow frequency hopping multicarrier direct-sequence code division multiple access (SFH/MC DS-CDMA) is proposed and investigated, which can be rendered compatible with the existing second-generation narrowband CDMA ...
Hanzo, L., Yang, L-L.
core  

Model color-magnitude diagrams for Hubble Space Telescope observations of Local Group dwarf galaxies

, 1996
In this paper, we discuss a method to conduct a quantitative study of the star formation history (SFH) of Local Group (LG) galaxies using (HST) data. This method has proven to be successful in the analysis of the SFH of the same kind of galaxies using ...
Aparicio, A., Bertelli, G., Chiosi, C., Gallart, C.   +3 more
core   +1 more source

The star formation history of damped Lyman alpha absorbers

, 2005
The local power law relationship between the surface densities of neutral hydrogen gas and star formation rate (SFR) can be used to explore the SFR properties of damped Lyman alpha (DLA) systems at higher redshift.
A. M. Hopkins, D. A. Turnshek, Madau P., S. M. Rao   +3 more
core   +1 more source

DiffstarPop: A generative physical model of galaxy star formation history

The Open Journal of Astrophysics
We present DiffstarPop, a differentiable forward model of cosmological populations of galaxy star formation histories (SFH). In the model, individual galaxy SFH is parametrized by Diffstar, which has parameters $θ_{\rm SFH}$ that have a direct ...
Alex Alarcon, Andrew P. Hearin, Matthew R. Becker, Gillian Beltz-Mohrmann, Andrew Benson, Sachi Weerasooriya   +5 more
doaj   +1 more source

Baking sunflower hulls within an aluminum envelope in a common laboratory oven yields charcoal

MethodsX, 2015
Charcoals have been widely used by scientist to research the removal of contaminants from water and air. One key feature of charcoal is that it keeps macropores from the parent material – though anisotropically contracted – and can even develop meso- and
Pablo Maximiliano Arnal
doaj   +1 more source

Evaluation the Compared Doppler Ultrasonography and Serial Fondal Height Measurement in Detection of IUGR

پزشکی بالینی ابن سینا, 2008
Introduction & Objective: There are different methods for detection of fetal growth restriction. The most important methods are serial fondal height (SFH), and ultrasonic measurement.
Shohreh Alimohammadi, Mehrangiz Zamani
doaj  

Topological gravity on plumbed V-cobordisms

, 2005
An ensemble of cosmological models based on generalized BF-theory is constructed where the role of vacuum (zero-level) coupling constants is played by topologically invariant rational intersection forms (cosmological-constant matrices) of 4-dimensional ...
Alfonso M Hernández Magdaleno, Baez J, Capovilla R, Dijkgraaf R, Dowker H F, Efremov V N, Eisenbud D, Fintushel R, Freed D S, Gibbons G W, Hartnoll S A, Horowitz G, Neumann W, Nikolai V Mitskievich, Orlik P, Ramona Serrano Bautista, Rourke S P, Saveliev N, Saveliev N, Saveliev N, Scott P, Siebenmann L, Spanier E H, Stake I, Vladimir N Efremov, Wigner E P   +25 more
core   +1 more source

Holomorphic discs and sutured manifolds

, 2009
In this paper we construct a Floer-homology invariant for a natural and wide class of sutured manifolds that we call balanced. This generalizes the Heegaard Floer hat theory of closed three-manifolds and links.
András Juhász, Gabai, Gabai, Milnor, Ozsváth, Ozsváth   +5 more
core   +1 more source

Factors influencing the competence of student midwives in symphysis-fundal height measurement: A quantitative study

Curationis
Background: Given the central role of antenatal competencies in midwifery practice and the critical importance of accurate symphysis-fundal height (SFH) measurement for monitoring foetal growth, it is essential to explore the factors that influence ...
Winile D. Cele, Pretty N. Mbeje, Euphemia M. Mhlongo   +2 more
doaj   +1 more source

Testing a New Star Formation History Model from Principal Component Analysis to Facilitate Spectral Synthesis Modeling

The Astrophysical Journal
The spectrum of a galaxy is a complicated convolution of many properties of the galaxy, such as the star formation history (SFH), initial mass function, and metallicity.
Yanzhe Zhang, H. J. Mo, Katherine E. Whitaker, Shuang Zhou   +3 more
doaj   +1 more source