Results 251 to 260 of about 140,482 (308)

Hydraulics of Center‐Pivot Laterals

Journal of Irrigation and Drainage Engineering, 1993
Analytical equations that characterize hydraulics of center‐pivot laterals with and without end‐gun sprinklers were developed. The equations include computation of pressure‐head distribution; pressure‐head loss; and maximum, minimum, and average pressure heads and their corresponding locations of occurrence along a lateral.
Edmar J. Scaloppi, Richard G. Allen
openaire   +1 more source

Center Pivot Irrigation Systems

2016
A center pivot irrigation system is a movable pipe structure that rotates around a central pivot point connected to a water supply. Center pivot irrigation systems are the most popular sprinkler irrigation systems in the world because of their high efficiency, high uniformity, ability to irrigate uneven terrain, and low capital, maintenance, and ...
Peter Waller, Muluneh Yitayew
openaire   +1 more source

Center-Pivot Irrigation Position Alarm System

Applied Engineering in Agriculture, 1992
A position alarm system was designed, developed, and evaluated for use on a single tower, center-pivot irrigation system. The alarm system signals the operator when the pivot boom reaches an established position. The position of the pivot boom and tower can be determined within 0.62° when the direction of rotation is reversed (clockwise and counter ...
null H. R. Sumner, null W. W. Wolf, null C. C. Dowler   +2 more
openaire   +1 more source

Variable-Rate Chemigation via Center Pivots

Journal of Irrigation and Drainage Engineering, 2019
AbstractCenter pivots can be used to achieve variable-rate chemigation—applying spatially variable dosages of agricultural chemicals within the same field.
Tsz Him Lo, Daran R. Rudnick, Tim M. Shaver   +2 more
openaire   +1 more source

Rice Production with Center Pivot Irrigation

Applied Engineering in Agriculture, 2013
While continuous-flood irrigation, the most common method for U.S. rice production, can have a fairly high irrigation application efficiency, factors such as soil variability and the size of most Mid-South farming operations often combine to reduce the efficiency.
null E. D. Vories, null W. E. Stevens, null P. L. Tacker, null T. W. Griffin, null P. A. Counce   +4 more
openaire   +1 more source

Selecting Sprinkler Packages for Center Pivots

5th National Decennial Irrigation Conference Proceedings, 5-8 December 2010, Phoenix Convention Center, Phoenix, Arizona USA, 2010
Abstract: Center pivots are the primary method of irrigation across the Great Plains. Center pivot irrigation is also the fastest growing method of irrigation in the United States and around the world. Pivots have the potential to be very efficient and uniform if sprinkler devices are properly selected for local field conditions.
Martin, Derrel L., Kranz, William L., Thompson, Allen L., Liang, Hong   +3 more
openaire   +1 more source

CENTER-PIVOT AUTOMATIZATION FOR AGROCHEMICAL USE

IFAC Proceedings Volumes, 2002
Abstract This paper presents an agrochemical application system that could be incorporated to existing irrigating center-pivots. The system consists in a hydraulic circuit with emitters dose controlled with variable valve timing. The electronic control system has been designed to be modular and distributed along the pivot with a main algorithm based ...
J. Palacín, J.A. Salse, X. Clua, J. Arnó, C. Zanuy   +4 more
openaire   +1 more source

Center-pivot automatization for agrochemical use

Computers and Electronics in Agriculture, 2005
This paper presents an agrochemical application system that could be incorporated into existing irrigating center-pivots. The system consisted of a hydraulic circuit with emitters, where the dose was individually controlled with variable valve timing. This paper describes the electronic control system, designed to be modular and distributed along the ...
Palacín Roca, Jordi, Salse, José Antonio, Clua, Xavier, Arnó Satorra, Jaume, Blanco Ortiz, Ricardo, Zanuy, C.   +5 more
openaire   +2 more sources

Using Center Pivots for Research

Journal of Irrigation and Drainage Engineering, 1988
Research to determine crop water-production functions normally involves random block designs or a line sprinkler source. Both of these setups have disadvantages that can largely be overcome by using modified center pivots. The otraveling tricklero center-pivot modification uses a series of small adjustable emitters (tricklers) to apply water.
openaire   +1 more source

The Pivotal Role of the Academic Health Center

Health Affairs, 1994
Academic health centers (AHCs) now play major roles in the development, adoption, and evaluation of medical technologies; the provision of advice to other entities involved in medical innovation; and the education of current and future practitioners. However, recent and potential health care reform initiatives could make it increasingly difficult for ...
G, Anderson, E, Steinberg, R, Heyssel
openaire   +2 more sources