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Combining physical and cultural weed control with biological methods – prospects for integrated non-chemical weed management strategies Organic Eprints
Hatcher, Scientist Paul; Melander, Scientist Bo.
The paper deals with the possibilities of combining physical weed control with biological weed control.
Tipo: Conference paper, poster, etc. Palavras-chave: Weed management.
Ano: 2004 URL: http://orgprints.org/2615/1/Abstracts_Lillehammer_2004.pdf
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Prevent and control of grapevine downy mildew Organic Eprints
Kassemeyer, Dr. Hanns-Heinz.
Abstract - To date in organic viticulture grapevine downy mildew is controlled mainly by treatments with copper. Under favourable conditions the disease spreads rapidly and causes severe losses of yield and quality. To develop a strategy for the biological con-trol of grapevine downy mildew, the infection cycle of the pathogen has been investigated in detail. On the basis of the biological data, a model for the specific control of grapevine has been developed. This model indicates the most suitable stages of the infection cycle for the precise control of the disease .
Tipo: Conference paper, poster, etc. Palavras-chave: Crop health; Quality; Protection.
Ano: 2006 URL: http://orgprints.org/7457/1/Abstract_Kassemeyer.doc
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A Numerical Stochastic Control model of Range Management AgEcon
Beard, Rodney.
An optimal stochastic control model of grazing that incorporates both pasture and livestock dynamics is presented. The model is solved numerically using Markov chain approximation methods. Markov chain approximation methods have a number of advantages as a means of solving stochastic optimal control methods compared with the usual alternatives. In particular, optimal control of the approximating Markov chain may be determined using Linear programming methods, thus making optimal stochastic control methods accessible to a wider audience.
Tipo: Presentation Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2000 URL: http://purl.umn.edu/123604
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On Prevention and Control of an Uncertain Biological Invasion AgEcon
Olson, Lars J.; Roy, Santanu.
This paper examines how optimal prevention and control policies depend on the economic and biological characteristics of a randomly introduced biological invasion where the objective is to minimize the expected social costs from prevention, control, and invasion damages. The results characterize how optimal prevention and control policies vary with the initial invasion size, the invasion growth rate, and the probability distribution of introductions. The paper also examines the conditions under which the optimal policy relies solely on either prevention or control, the conditions under which it is optimal to completely...
Tipo: Working or Discussion Paper Palavras-chave: Resource /Energy Economics and Policy.
Ano: 2005 URL: http://purl.umn.edu/28595
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U.S. Dairy Industry Supply Control: Managing the Cooperatives Working Together Program AgEcon
Siebert, John W.; Lyford, Conrad P..
This teaching note is intended as a guide for classroom use of the case, “U.S. Dairy Industry Supply Control: Managing the Cooperatives Working Together Program.” Some of the teaching objectives of this case are to: (1) evaluate the benefits from an industry supply control effort; (2) understand the problems and causes of oversupply in a commodity industry; and (3) learn about price equilibrium. Teachers using this note can present a dynamic analysis using the cobweb theorem. Also, teachers can compare and contrast the welfare impact of funding supply control versus the welfare impact of funding commodity promotion.
Tipo: Journal Article Palavras-chave: Livestock Production/Industries; Teaching/Communication/Extension/Profession; CWT; Dairy; Elasticity; Milk; Supply Control.
Ano: 2009 URL: http://purl.umn.edu/51711
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Public policy and private incentives for livestock disease control AgEcon
Bicknell, Kathryn; Wilen, James E.; Howitt, Richard E..
This article presents a dynamic bioeconomic model of livestock disease control that is unique in its integration of disease dynamics, inter‐species interaction, control‐induced migration, and individual optimising behaviour. Examination of the first‐order conditions highlights why profit‐maximising producers cannot be expected to eradicate disease. Results from an empirical application of the model confirm that the current mix of policies to control bovine tuberculosis in New Zealand is achieving lower levels of prevalence than would prevail in the absence of a national strategy. These policies do, however, appear to remove some of the individual incentive...
Tipo: Journal Article Palavras-chave: International Relations/Trade; Livestock Production/Industries.
Ano: 1999 URL: http://purl.umn.edu/117214
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ECONOMIC ANALYSES OF HOMEOWNERS' ATTITUDES TOWARD FORMOSAN SUBTERRANEAN TERMITE (FST) CONTROL PROGRAMS IN LOUISIANA AgEcon
Bhandari, Doleswar; Paudel, Krishna P.; Dunn, Michael A.; Vlosky, Rich; Guidry, Kurt M..
We collected survey responses regarding the attitudes of home owners toward Formosan Subterranean Termite (FST) control. Median value for willingness to pay for a termite control program is found to be $0.16 per square feet per year. A contingent ranking analysis indicated that most homeowners opt for a minimum cost control alternative for FST control
Tipo: Conference Paper or Presentation Palavras-chave: Consumer/Household Economics.
Ano: 2003 URL: http://purl.umn.edu/22165
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A Numerical Stochastic Control model of Range Management AgEcon
Beard, Rodney.
An optimal stochastic control model of grazing that incorporates both pasture and livestock dynamics is presented. The model is solved numerically using Markov chain approximation methods. Markov chain approximation methods have a number of advantages as a means of solving stochastic optimal control methods compared with the usual alternatives. In particular, optimal control of the approximating Markov chain may be determined using Linear programming methods, thus making optimal stochastic control methods accessible to a wider audience.
Tipo: Presentation Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2000 URL: http://purl.umn.edu/123643
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Democratic Control and Cooperative Decision Making: A Conceptual Framework AgEcon
Anderson, Bruce L..
What is the impact of democratic control on cooperative decision making? The purpose of this article is to present a conceptual framework for the analysis of democratic control. It suggests that democratic control does not guarantee optimal decisions for the cooperative. Suboptimal decisions result from simple majority rule, the activity of cooperative interest groups, members pursuing their interests to the detriment of the cooperative firm, and management pursuing its interests at the expense of the membership. This paper also outlines strategies cooperatives can adopt to correct the problems due to democratic control.
Tipo: Journal Article Palavras-chave: Agribusiness.
Ano: 1987 URL: http://purl.umn.edu/46199
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Design, Simulation and Development of Software Modules for the Control of Concrete Elements Production Plant InTech
Georgia Garani; George K. Adam.
Since most of the modern concrete elements production plants today are often faced with increasing market demands for further automation, as well as the growing international competition, computer-control systems, teleoperation and automation technology, modelling and simulation tools are some of the technologies and techniques used to acquire the desired functionality in operation control and quality in production. The last decade has seen computer technology applied more widely in industrial production, particularly in manufacturing processes not generally associated with high-technology. Often, such technology was not considered because it was difficult to model manufacturing processes...
Tipo: 15 Palavras-chave: New Approaches in Automation and Robotics.
Ano: 2008 URL: http://www.intechopen.com/articles/show/title/design__simulation_and_development_of_software_modules_for_the_control_of_concrete_elements_producti
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Insect pathogenic fungi in biological control: status and future challenges Organic Eprints
Eilenberg, Jørgen; Meyling, Nicolai V.; Jensen, Annette B..
In Europe, insect pathogenic fungi have in decades played a significant role in biological control of insects. With respect to the different strategies of biological control and with respects to the different genera of insect pathogenic fungi, the success and potential vary, however. Classical biological control: no strong indication of potential. Inundation and inoculation biological control: success stories with the genera Metarhizium, Beauveria, Isaria/Paecilomyces and Lecanicillium (previously Verticillium). However, the genotypes employed seem to include a narrow spectrum of the many potentially useful genotypes....
Tipo: Conference paper, poster, etc. Palavras-chave: Regulation; Markets and trade; Biodiversity and ecosystem services.
Ano: 2009 URL: http://orgprints.org/16060/2/16060.pdf
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The effect of sowing date, stale seedbed, row width and mechanical weed control on weeds and yields of organic winter wheat Organic Eprints
Rasmussen, Ilse A..
Three field experiments were carried out in organically grown winter wheat in Denmark. The treatments were sowing time (normal or late sowing) and false seedbed, row width (12 cm and 24 cm) and weed control method (untreated, mechanical weed control (weed harrowing at 12 cm supplemented with inter-row hoeing at 24 cm), and herbicide weed control). Weed biomass in mid-summer was greatest on plots sown at the normal sowing time (compared to delayed sowing) and was reduced by mechanical or chemical weed control (compared with untreated plots). Row width alone had no influence on weed biomass, but in the experiment with high...
Tipo: Journal paper Palavras-chave: Cereals; Pulses and oilseeds Weed management Crop husbandry.
Ano: 2004 URL: http://orgprints.org/3932/1/rasmussen.pdf
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Benefit Evaluation on the Control Mode for Typical Karst Rocky Desertification in Guizhou Province, China AgEcon
Zuo, Xing-jun; Zuo, Tai-an; Xu, Shu-jian.
Control mode for typical karst rocky desertification in Guizhou Province, China is selected as the research object. The ecological benefit, the social and economic benefit and the popularization prospect of mode are selected as evaluation indices. Evaluation index system of control mode benefits for karst rocky desertification is established. The Dingtan mode and the Wangjiazhai-Yangchangdong small watershed control mode are selected as evaluation objects. Preliminary assessment on the two modes are carried out by Analytic Hierarchy Process,grading evaluation, and comprehensive evaluation method. Result shows that comprehensive score of Dingtan mode is...
Tipo: Journal Article Palavras-chave: Desertification; Control mode; The Dingtan mode; The Wangjiazhai-Yangchangdong small watershed control mode; Guizhou Province; China; Agribusiness.
Ano: 2010 URL: http://purl.umn.edu/96070
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A Dynamic Optimisation Model of Weed Control AgEcon
Cacho, Oscar J.; Jones, Randall E..
It is argued in this paper that static approaches to weed management, where the benefits and costs are only considered within a single season, are inappropriate for assessing the economic benefits of weed control technologies. There are carryover effects from weed management as weeds that escape control in one season may reproduce and replenish weed populations in following seasons. Consequently, it is appropriate to view weed control in the context of a resource management problem where the goal is to determine the optimal inter-temporal level of weed control that maximises economic benefits over some pre-determined...
Tipo: Working or Discussion Paper Palavras-chave: Weed control; Resource economics; Optimal control; Dynamic programming; Wild oats; Farm Management.
Ano: 2000 URL: http://purl.umn.edu/12902
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網室內釋放錨紋瓢蟲(鞘翅目:瓢蟲科)防治萵苣白尾紅蚜(簡報) Taiwan Agricultural Research Institute
余志儒; 陳炳輝; Jih-Zu Yu; Bing-Huei Chen.
[[abstract]]Experiment was conducted to biologically control the aphids on romaine lettuce (Lactuca sativa L.) by continuously supplementary releasing coccinellid (Lemnia biplagiata (Swartz)) larvae in screen house. Only Uroleucon formosanum (Takahashi) was found throughout the experiment. Densities of the aphids increased from 0.6 to 32.8 per plant within 2 weeks after planting in the check. The aphid number in the biological control plot and the chemical control plot also increased but were not as rapidly as that in the check. Results of this experiment showed that both control treatments could effectively suppress U....
Palavras-chave: 錨紋瓢虫 蚜虫 生物防治 網室 Lemnia biplagiata (Swartz); Aphid; Biological control; Screen house [[classification]]5.
Ano: 2001
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PREDICTED FUTURE ECONOMIC IMPACTS OF BIOLOGICAL CONTROL OF LEAFY SPURGE IN THE UPPER MIDWEST; SUMMARY AgEcon
Bangsund, Dean A.; Leistritz, F. Larry; Leitch, Jay A..
The Leafy Spurge Biological Control program was designed to use insects and plant diseases from the plant's original European habitat to control infestations in the United States. The widespread adoption of biological agents to combat leafy spurge and the initial success in reclaiming previously infested land has prompted an evaluation of the potential future economic benefits of the biological control of leafy spurge in the Upper Midwest. Based on expert opinion and historical data, leafy spurge in Montana, North Dakota, South Dakota, and Wyoming was projected to infest 1.85 million acres, of which, 65 percent was estimated to controlled with biological...
Tipo: Working or Discussion Paper Palavras-chave: Biological control; Leafy spurge; Economic impacts; Upper Midwest; Resource /Energy Economics and Policy.
Ano: 1997 URL: http://purl.umn.edu/23232
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Malaria and dengue vector biology and control in Southeast Asia Frontis
Kittayapong, P..
This chapter reviews the situation of vector biology and control of both malaria and dengue in the Southeast-Asian region as part of the World Health Organization (WHO/TDR) working-group meeting on strategic planning to bridge laboratory and field research in disease vector control. Many research studies on malaria were related to the survey of malaria vectors and parasites and their spatial and temporal distribution in each country. A few studies demonstrated application of molecular tools to identify sibling species in the vector complexes as well as the genetic structure and gene flow among these complex species. Despite insecticide resistance having been detected in many vector...
Tipo: Conference proceedings
Ano: 2005 URL: http://library.wur.nl/ojs/index.php/frontis/article/view/1190
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Control de Gleditsia triacanthos en el Parque Nacional Esteros de Farrapos e Islas del Río Uruguay Ecología austral
Sosa,Beatriz; Caballero,Natalia; Carvajales,Andrés; Fernández,Gabriela; Mello,Ana L.; Achkar,Marcel.
Las especies invasoras constituyen una amenaza para la conservación de la biodiversidad, por lo que el desarrollo de programas para su control requiere de una evaluación cuidadosa. La invasión de Gleditsia triacanthos es una de las principales amenazas en el Parque Nacional Esteros de Farrapos e Islas del Río Uruguay. Evaluamos la efectividad del control de esta leñosa mediante la aplicación de dos herbicidas (Glifotec y Tordón) en perforaciones practicadas en el tronco, y su impacto sobre la regeneración del componente leñoso de la vegetación. Luego de dos años de la aplicación, la mortalidad media por parcela para los tratamientos con Tordón y Glifotec fue 66% y 60%, respectivamente. Sin...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Control de invasoras; Bosques fluviales; Aplicación de herbicidas; Efectos métodos de control.
Ano: 2015 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1667-782X2015000300010
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About minimal time impulsive control of sequential batch reactors with several species Inra
Rapaport, A.; Gajardo, P.; Ramirez, H..
We consider the optimal control problem of feeding in minimal time a tank where several species compete on a single resource. We allow controls to be bounded measurable functions of time as well as impulses. For the one species case, we extend former results given by Moreno [12] to the framework of impulse controls. For the two species case with increasing growth functions, we show that the solution of the minimal time problem consists in either one impulse control at initial time filling the whole tank, either reaching a singular arc. This last one is optimally reached with an impulse or waiting, and consists in keeping the system at a constant resource level until the tank is filled....
Tipo: Conference Paper Palavras-chave: SYSTEME DE CONTROLE; CONTROLE OPTIMAL; ETUDE DE CAS; TRAITEMENT DES DECHETS DE L’EAU; QUALITE DE L’EAU CONTROL SYSTEM; SEQUENTIAL BATCH REACTORS; OPTIMAL CONTROL; BIOTECHNOLOGY.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20087a52ad38&uri=/notices/prodinra1/2008/08/
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Mechanism and Control of Anthropomorphic Biped Robots InTech
Hun-ok Lim; Atsuo Takanishi.
The mechanism of a 43 DOF biped humanoid robot WABIAN-RII was described to simulate human motions was described. For the humanoid robot to walk stably on various terrains, its functions should be separated. Its waist and trunk carries out the function of stability, while its legs work out the function of the locomotion. A locomotion pattern generation was discussed which used a polynomial. In the pattern generation, the direction of the walking and the length of the step can be determined by visual and auditory information. Also, a moment compensation control was presented to balance its body, which was based on the motion of the waist and trunk. In addition, an impedance control method...
Tipo: 16 Palavras-chave: Mobile Robotics; Moving Intelligence.
Ano: 2006 URL: http://www.intechopen.com/articles/show/title/mechanism_and_control_of_anthropomorphic_biped_robots
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