Results 101 to 110 of about 5,629,721 (306)

Comparison of Na Lidar and Meteor Radar Wind Measurements at Starfire Optical Range, NM, USA [PDF]

open access: yes, 2002
Simultaneous wind measurements in the mesopause region at Starfire Optical Range near Albuquerque, NM with Na wind/temperature lidar and meteor radar have been performed and compared.
Franke, Steven J.   +3 more
core   +1 more source

Matrigel inhibits elongation and drives endoderm differentiation in aggregates of mouse embryonic stem cells

open access: yesFEBS Open Bio, EarlyView.
Stem cell‐based embryo models (SCBEMs) are valuable to study early developmental milestones. Matrigel, a basement membrane matrix, is a critical substrate used in various SCBEM protocols, but its role in driving stem cell lineage commitment is not clearly defined.
Atoosa Amel   +3 more
wiley   +1 more source

Observational Investigations of Gravity Wave Momentum Flux with Spectroscopic Imaging [PDF]

open access: yes, 2005
We apply a newly developed gravity wave momentum flux estimation method to the mesospheric measurements obtained with colocated airglow imager and meteor radar at Maui, Hawaii (20.7ºN, 156.3ºW), during the Maui Mesosphere and Lower Thermosphere (Maui ...
Kamalabadi, F.   +3 more
core   +1 more source

Comparison of Meteor Radar and Na Doppler Lidar Measurements of Winds in the Mesopause Region above Maui, Hawaii [PDF]

open access: yes, 2005
The coincident measurements span 96 hours and altitudes between 80 and 100 km. Statistical comparisons are carried out on radar/lidar winds with 1 hour and 4 km time and height resolution, respectively.
Chu, X.   +3 more
core   +1 more source

Integers and Fractions [PDF]

open access: yesCurrent Science 75 (1998) 985 - 987, 1998
This article briefly reviews the quantum Hall effect and the contributions of the winners of the 1998 Nobel Prize in Physics.
arxiv  

Measurements of Atmospheric Stability in the Mesopause Region at Starfire Optical Range, NM [PDF]

open access: yes, 2003
The structure and seasonal variations of static (convective) and dynamic (shear) instabilities in the mesopause region (80–105 km) are examined using high-resolution wind and temperature data obtained with a Na lidar at the Starfire Optical Range, NM ...
Gardner, Chester S.   +2 more
core   +1 more source

Physics education research: Resources for middle school science teachers [PDF]

open access: yesarXiv, 2009
This resource letter intends to provide middle school science teachers with a collection of resources to aid them in planning and implementing a physical science curriculum. The resources are in the form of books, websites, journals, and organizations.
arxiv  

Attempting Measurement of Psychological Attributes

open access: yesFrontiers in Psychology, 2013
Measures of psychological attributes abound in the social sciences as much as measures of physical properties do in the physical sciences. However, there are crucial differences between the scientific underpinning of measurement. While measurement in the
Thomas eSalzberger
doaj   +1 more source

Observations of Persistent Leonid Meteor Trails. 1. Advection of the Diamond Ring [PDF]

open access: yes, 2001
From a single image of a persistent trail left by a -1.5 magnitude Leonid meteor on November 17, 1998, the relative winds between 92.5 and 98 km altitude are derived, where the altitudes are determined by a sodium lidar. These are converted to true winds
Chu, Xinzhao   +5 more
core   +1 more source

On the Nature of Science [PDF]

open access: yesPhysics in Canada, 63 (2007) 7, 2006
A 21st century view of the nature of science is presented. It attempts to show how a consistent description of science and scientific progress can be given. Science advances through a sequence of models with progressively greater predictive power.
arxiv  

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