999 resultados para Period-doubling bifurcation
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Report on a special investigation of the City of Riverside for the period July 1, 2006 through December 31, 2012
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Examination report on the City of Sully, Iowa for the period July 1, 2012 through June 30, 2013
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While an adequate supply of food can be achieved at present for the current global population, sustaining this into the future will be difficult in the face of a steadily increasing population, increased wealth and a diminishing availability of fertile land and water for agriculture. This problem will be compounded by the new uses of agricultural products, for example, as biofuels. Wheat alone provides ≥20% of the calories and the protein for the world's population, and the value and need to increase the production is recognized widely. Currently, the world average wheat yield is around 3 t/ha but there is considerable variation between countries, with region-specific factors limiting yield, each requiring individual solutions. Delivering increased yields in any situation is a complex challenge that is unlikely to be solved by single approaches and a multidisciplinary integrated approach to crop improvement is required. There are three specific major challenges: increasing yield potential, protecting yield potential, and increasing resource use efficiency to ensure sustainability. Since the green revolution, yields at the farm gate have stagnated in many countries, or are increasing at less than half the rate required to meet the projected demand. In some countries, large gains can still be achieved by improvements in agronomy, but in many others the yield gains will only be achieved by further genetic improvement. In this overview, the problems and potential solutions for increased wheat yields are discussed, in the context of specific geographic regions, with a particular emphasis on China. The importance and the prospects for improvement of individual traits are presented. It is concluded that there are opportunities for yield increase but a major challenge will be avoiding a simultaneous increase in resource requirements.
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Report on a review of the Sixth Judicial District Department of Correctional Services for the period July 1, 2008 through June 30, 2012
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Examination report on the City of Emerson, Iowa for the period July 1, 2012 through June 30, 2013
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Report on a review of selected general and application controls over the Iowa Department of Transportation’s Vehicle Registration and Title System for the period April 16, 2012 through May 15, 2012
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Examination report on the City of Dike, Iowa for the period July 1, 2012 through June 30, 2013
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Examination report on the City of Urbana, Iowa for the period July 1, 2012 through June 30, 2013
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Examination report on the City of Murray, Iowa for the period July 1, 2012 through June 30, 2013
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Examination report on the City of Magnolia, Iowa for the period July 1, 2012 through June 30, 2013
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Examination report on the City of Rhodes, Iowa for the period July 1, 2012 through June 30, 2013
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Report on a review of selected general and application controls over the Iowa Public Employees’ Retirement System I-Que Pension Administration System for the period May 20, 2013 through July 12, 2013
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Field studies were conducted over 3 years in southeast Buenos Aires, Argentina, to determine the critical period of weed control in maize (Zea mays L.). The treatments consisted of two different periods of weed interference, a critical weed-free period, and a critical time of weed removal. The Gompertz and logistic equations were fitted to relative yields representing the critical weed-free and the critical time of weed removal, respectively. Accumulated thermal units were used to describe each period of weed-free or weed removal. The critical weed-free period and the critical time of weed removal ranged from 222 to 416 and 128 to 261 accumulated thermal units respectively, to prevent yield losses of 2.5%. Weed biomass proved to be inverse to the crop yield for all the years studied. When weeds competed with the crop from emergence, a large increase in weed biomass was achieved 10 days after crop emergence. However, few weed seedlings emerged and prospered after the 5-6 leaf maize stage (10-20 days after emergence).
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Examination report on the City of Granger, Iowa for the period July 1, 2012 through June 30, 2013