Results 1 to 10 of about 958,468 (325)

Novel crystal timing calibration method based on total variation [PDF]

Physics in Medicine and Biology, 2016
A novel crystal timing calibration method based on total variation (TV), abbreviated as 'TV merge', has been developed for a high-resolution positron emission tomography (PET) system. The proposed method was developed for a system with a large number of crystals, it can provide timing calibration at the crystal level. In the proposed method, the timing
Xingjian Yu, Takashi Isobe, M. Watanabe, Huafeng Liu   +3 more
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Estimating the timing of mother-to-child transmission of the human immunodeficiency virus type 1 using a viral molecular evolution model. [PDF]

PLoS ONE, 2014
Mother-to-child transmission (MTCT) is responsible for most pediatric HIV-1 infections worldwide. It can occur during pregnancy, labor, or breastfeeding. Numerous studies have used coalescent and molecular clock methods to understand the epidemic history
Antoine Chaillon, Tanawan Samleerat, Faustine Zoveda, Sébastien Ballesteros, Alain Moreau, Nicole Ngo-Giang-Huong, Gonzague Jourdain, Sara Gianella, Marc Lallemant, Frantz Depaulis, Francis Barin   +10 more
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Onset patterns in autism: Variation across informants, methods, and timing [PDF]

Autism Research, 2018
While previous studies suggested that regressive forms of onset were not common in autism spectrum disorder (ASD), more recent investigations suggest that the rates are quite high and may be under‐reported using certain methods. The current study undertook a systematic investigation of how rates of regression differed by measurement method.
Sally Ozonoff, Devon N. Gangi, Elise Phelps Hanzel, Alesha Hill, Monique Moore Hill, Meghan Miller, A. J. Schwichtenberg, Mary Beth Steinfeld, Chandni Parikh, Ana‐Maria Iosif   +9 more
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FAST INVERSION METHOD FOR DETERMINATION OF PLANETARY PARAMETERS FROM TRANSIT TIMING VARIATIONS [PDF]

The Astrophysical Journal, 2010
The Transit Timing Variation (TTV) method relies on monitoring changes in timing of transits of known exoplanets. Non-transiting planets in the system can be inferred from TTVs by their gravitational interaction with the transiting planet. The TTV method is sensitive to low-mass planets that cannot be detected by other means.
David Nesvorný, Cristián Beaugé
openalex   +5 more sources

Management of fetal umbilical vein varix: a survey-based analysis of current clinical practice [PDF]

Archives of Gynecology and Obstetrics
Objective To evaluate current diagnostic criteria, risk stratification, and management practices for fetal intra-abdominal umbilical vein varix (FIUVV) among maternal–fetal medicine and obstetric ultrasound specialists in Israel.
Rachelle Fraenkel Merzbach, Reut Rotem, Dan V. Valsky, Hen Y. Sela, Simcha Yagel, Misgav Rottenstreich   +5 more
doaj   +2 more sources

Revisiting the Transit Timing and Atmosphere Characterization of the Neptune-mass Planet HAT-P-26 b

The Astronomical Journal, 2023
We present a transit-timing variation (TTV) and planetary atmosphere analysis of the Neptune-mass planet HAT-P-26 b. We present a new set of 13 transit light curves from optical ground-based observations and combine them with light curves from the Wide ...
Napaporn A-thano, Supachai Awiphan, Ing-Guey Jiang, Eamonn Kerins, Akshay Priyadarshi, Iain McDonald, Yogesh C. Joshi, Thansuda Chulikorn, Joshua J. C. Hayes, Stephen Charles, Chung-Kai Huang, Ronnakrit Rattanamala, Li-Chin Yeh, Vik S Dhillon   +13 more
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Parental socioeconomic status and the timing of first marriage: What is the role of unmarried cohabitation? Results from a cross-national comparison

Demographic Research, 2021
Background: Previous research has shown that individuals from high-status families enter marriage later than those from low-status families. However, in many Western societies, it has become common to cohabit prior to marriage.
Anne Brons, Aart C. Liefbroer, Harry B.G. Ganzeboom   +2 more
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Space–time variational methods for Maxwell's equations [PDF]

PAMM, 2019
AbstractThe efficient and accurate numerical solution of the time–dependent Maxwell equations is one of the most challenging tasks, see, e.g., [1]. Besides semi–discretization methods such as the method of lines and Laplace transformation approaches, space–time variational formulations became popular in recent years.
Julia I. M. Hauser, Olaf Steinbach
openaire   +1 more source

Genomic region associated with run timing has similar haplotypes and phenotypic effects across three lineages of Chinook salmon

Evolutionary Applications, 2021
Conserving life‐history variation is a stated goal of many management programs, but the most effective means by which to accomplish this are often far from clear.
Stuart C. Willis, Jon E. Hess, Jeff K. Fryer, John M. Whiteaker, Shawn R. Narum   +4 more
doaj   +1 more source

Variational methods for time-dependent classical many-particle systems [PDF]

Physica A: Statistical Mechanics and its Applications, 2013
A variational method for the classical Liouville equation is introduced that facilitates the development of theories for non-equilibrium classical systems. The method is based on the introduction of a complex-valued auxiliary quantity Ψ that is related to the classical position-momentum probability density ρ via ρ = Ψ*Ψ.
Yuriy V, Sereda, Peter J, Ortoleva
openaire   +2 more sources