Results 21 to 30 of about 187 (125)
BMC Genomics, 2018 Background Hot spring bacteria have unique biological adaptations to survive the extreme conditions of these environments; these bacteria produce thermostable enzymes that can be used in biotechnological and industrial applications.
Andres Benavides +4 more
doaj +1 more source
Mathematical Problems in Engineering, Volume 2013, Issue 1, 2013., 2013 This paper shows a study, both analytical and numerical, of a continuous‐time dynamical system associated with a simple model of a wastewater biorreactor. Nonsmooth phenomena and border‐collision local bifurcations appear when the main parameters (dilution and biomass concentration at the inflow) are varied.
Luz A. Melo Varela +3 more
wiley +1 more source
L ∞ -algebras and the perturbiner expansion
Journal of High Energy Physics, 2019 Certain classical field theories admit a formal multi-particle solution, known as the perturbiner expansion, that serves as a generating function for all the tree-level scattering amplitudes and the Berends-Giele recursion relations they satisfy. In this
Cristhiam Lopez-Arcos +1 more
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Adaptive Quasi‐Sliding Mode Control for Permanent Magnet DC Motor
Mathematical Problems in Engineering, Volume 2013, Issue 1, 2013., 2013 The motor speed of a buck power converter and DC motor coupled system is controlled by means of a quasi‐sliding scheme. The fixed point inducting control technique and the zero average dynamics strategy are used in the controller design. To estimate the load and friction torques an online estimator, computed by the least mean squares method, is used ...
Fredy E. Hoyos +5 more
wiley +1 more source
Adaptive Control for Nonlinear Systems with Time‐Varying Control Gain
Journal of Control Science and Engineering, Volume 2012, Issue 1, 2012., 2012 We propose a scheme for nonlinear plants with time‐varying control gain and time‐varying plant coefficients, on the basis of a plant model consisting of a Brunovsky‐type model with polynomials as approximators. We develop an adaptive robust control scheme for this plant, under the following assumptions: (i) the plant terms involve time‐varying but ...
Alejandro Rincon +2 more
wiley +1 more source
Bifurcations in a Generalization of the ZAD Technique: Application to a DC‐DC Buck Power Converter
Mathematical Problems in Engineering, Volume 2012, Issue 1, 2012., 2012 A variation of ZAD technique is proposed, which is to extend the range of zero averaging of the switching surface (in the classic ZAD it is taken in a sampling period), to a number K of sampling periods. This has led to a technique that has been named K‐ZAD. Assuming a specific value for K = 2, we have studied the 2‐ZAD technique.
Ludwing Torres +3 more
wiley +1 more source
Applied Sciences, 2021 Solar irradiance is an available resource that could support electrification in regions that are low on socio-economic indices. Therefore, it is increasingly important to understand the behavior of solar irradiance. and data on solar irradiance.
Laura Sofía Hoyos-Gomez +1 more
doaj +1 more source
Quantization Effects on Period Doubling Route to Chaos in a ZAD‐Controlled Buck Converter
Mathematical Problems in Engineering, Volume 2012, Issue 1, 2012., 2012 The quantization effect in transitions to chaos and periodic orbits is analyzed in this paper through a specific application, the zero‐average‐dynamics‐ (ZAD‐) controlled buck power converter. Several papers have studied the quantization effects in the one periodic orbit and some authors have given guidelines to design digitally controlled power ...
John Alexander Taborda +3 more
wiley +1 more source
Extent of threats to marine fish from the online aquarium trade in the United States
Conservation Biology, Volume 40, Issue 1, February 2026.The global marine aquarium hobby is a multibillion‐dollar industry, largely driven by demand from the United States. Much of this trade occurs online. We web scraped 4 major US‐based e‐commerce platforms selling marine aquarium fish to determine the retail price and source (wild capture, aquaculture, or both) of 13 families of ray‐finned marine fish ...
Bing Lin +6 more
wiley +1 more source
PLANTS, PEOPLE, PLANET, Volume 8, Issue 1, Page 338-352, January 2026.Cities are getting hotter because of climate change and urban development, increasing risks to health and well‐being. We analyzed how increasing urban tree canopy cover in city areas of 900 m2 can reduce land surface temperatures, using detailed aerial‐LiDAR and satellite data with Bayesian hierarchical models.
Ángel Ruiz‐Valero +7 more
wiley +1 more source