By transforming an exact stability condition, a new Nyquist-like plot is proposed to predict occurrences of three typical instabilities in DC-DC converters. The three instabilities are saddle-node bifurcation (coexistence of multiple solutions), period-doubling bifurcation (subharmonic oscillation), and Neimark bifurcation (quasi-periodic oscillation). In a single plot, it accurately predicts w...

Estimation of demographic history from nucleotide sequences represents an important component of many studies in molecular ecology. For example, knowledge of a population's history can allow us to test hypotheses about the impact of climatic and anthropogenic factors. In the past, demographic analysis was typically limited to relatively simple population models, such as exponential or logistic ...

A menu-driven graphics-based simulation package called DESIGN has been developed. It enables the users to add/delete poles or zeros and vary design requirements such as the value of the gain, damping factor, overshoot, delay time, rise time, bandwidth, resonance frequency, etc., to see the effects on system response. The package is designed around the root locus plot of a unity feedback control...

in order to investigate the effect of urea, azocompost and cutting on growth characteristics of oregano, a factorial split-plot experiment was conducted based on randomized complete block design with three replications at yazd and mashhad, iran, during 2012-2013 growing season. four urea levels and four azocompost levels (to provide 0, 40, 80 and 120 kg n.ha-1 each) for yazd location )0, 43.5, ...

Control Systems classes cover many new topics and concepts. By the time instructors begin to teach design of controllers, students have already learned some analysis and synthesis tools such as Root Locus, Routh-Hurwitz criteria for stability, Bode plot and its relation to stability, and Nyquist plot and its stability criterion. The problem is that at this point in time, these topics can still ...

The design of an interactive narrative begins with the choice of a type of story. In this paper I examine the potential of three kinds of plot for active user participation: the epic plot, which focuses on the struggle of the individual to survive in a hostile world, the dramatic plot, which deals with the evolution of a network of human relations, and the epistemic plot, which is propelled by ...

Tragacanth Gum is one of the most important medicinal and industrial productsof rangelands and is obtained from the incision of gum tragacanth-producing Astragalusincluding Astragalus keyserlingii. The conservation of Astragalus species in rangelandshas a special place in terms of economic profit and soil conservation. The increase in priceof gum tragacanth in recent years and more attention of...