432 research outputs found
The climate of Iowa: soil temperatures at Ames
The soil temperature observations summarized in this publication have been made possible through the cooperation of Iowa State University, the Iowa Department of Agriculture and the Weather Bureau, United States Department of Commerce. These observations constitute the only soil temperature record in Iowa of any appreciable length. Soil temperature measurements, however, have recently been initiated at Saratoga, Spencer, Council Bluffs and Burlington and are published currently by the United States Weather Bureau in the Climatological Data of Iowa (7).https://lib.dr.iastate.edu/specialreports/1021/thumbnail.jp
Our Usual Weather
This is the eighth and last in a series of articles on our weather to appear in Iowa Farm Science. This article deals with our usual weather in the state- the kinds which are typical of a location or season
Clouds - The Signposts of the Sky
To a camera enthusiast a good cloud can really make a picture. To the pilor of a plane, a cloud may be something to avoid. For those interested in the weather, to know your clouds is to know much about weather forecasting
The Air We Live In
The Earth is surrounded by a gaseous envelope which we call the atmosphere. This atmosphere extends over our heads for about 1,000 miles- becoming thinner and thinner and finally merging into interplanetary space
Why Our Weather Changes
The weather we have is caused by an interplay of a large number of different properties of the atmosphere. As the atmosphere moves, these properties change, and this makes the weather change at a particular location
Iowa Weather Patterns
Iowa is the crossroads of many air masses, fronts and pressure areas. These combine to give the state its ever-changing weather
What is Weather?
We live at the bottom of a vast sea of air hundreds of miles deep. Without this air or atmosphere, neither animals nor plants could exist. There would be no wind, no clouds, no rain, no fire. In short, weather- and life as we know it- would not exist
How Weather Forecasts Are Made
We\u27ve been looking in previous articles in this series some of the factors that cause weather to behave as it does. Now let\u27s see how a weather forecast is made. We\u27ll look in briefly on the operations of the United States Weather Bureau - the government\u27s official weather agency
How You and I Record the Weather
When you can measure what you are speaking about and express it in numbers, you know something about it, but when you cannot express it in numbers, your knowledge is of a meager, unsatisfactory kind
A scanning drift tube apparatus for spatio-temporal mapping of electron swarms
A "scanning" drift tube apparatus, capable of mapping of the spatio-temporal
evolution of electron swarms, developing between two plane electrodes under the
effect of a homogeneous electric field, is presented. The electron swarms are
initiated by photoelectron pulses and the temporal distributions of the
electron flux are recorded while the electrode gap length (at a fixed electric
field strength) is varied. Operation of the system is tested and verified with
argon gas, the measured data are used for the evaluation of the electron bulk
drift velocity. The experimental results for the space-time maps of the
electron swarms - presented here for the first time - also allow clear
observation of deviations from hydrodynamic transport. The swarm maps are also
reproduced by particle simulations
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