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MathematicsIn this paper, we investigate the maximum number of small-amplitude limit cycles bifurcated from a planar piecewise smooth focus-parabolic type cubic system that has one switching line given by the x-axis. By applying the generalized polar coordinates to
Fei Luo, Yundong Li, Yi Xiang
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Study on the Optical Properties of the Point-Focus Fresnel System [PDF]
Sustainability, 2021 The characteristic analysis of the flux formed by the heliostat in the optical system is the basis in design and optimization of the whole system. In this paper, our research subject is a pilot installation of the point-focus Fresnel system, which is a new optical design between the tower system and the dish system.
Shen, Fei, Huang, Weidong
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Centers of cubic differential systems with the line at infinity of maximal multiplicity
Acta et Commentationes: Ştiinţe Exacte şi ale Naturii, 2023 We classify all cubic differential systems with a center-focus critical point and the line at infinity of maximal multiplicity. It is proved that the critical point is of the center type if and only if the divergence of the vector field associated to ...
Alexandru Șubă
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Fractal and Fractional, 2022 In this paper, we focus on the existence of Hilfer fractional stochastic differential systems via almost sectorial operators. The main results are obtained by using the concepts and ideas from fractional calculus, multivalued maps, semigroup theory ...
Sivajiganesan Sivasankar +1 more
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Energy and economic comparison of three optical systems adopted in a point-focus CPV system [PDF]
Journal of the Brazilian Society of Mechanical Sciences and Engineering, 2022 AbstractThe concentrating photovoltaic (CPV) systems allow good results for generation of clean energy at competitive costs, but a careful selection of the optical system is essential to obtain energy and economic advantages. Hence, three different point-focus optics (parabolic mirror, spherical mirror and a commonly used Fresnel lens) characterized by
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Review of Dew Point Evaporative Cooling Technology for Air Conditioning Applications
Applied Sciences, 2021 Indirect evaporative cooling has the potential to significantly improve the natural environment. It follows from a significant reduction in electricity consumption in the hot period, and hence lower operating costs for cooling systems.
Anna Pacak, William Worek
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Leveraging Biodiversity Action From Plural Values: Transformations of Governance Systems
Frontiers in Ecology and Evolution, 2021 In this paper, we argue that leveraging plural values into action for biodiversity requires a focus on transforming the biodiversity governance system. We draw on Donella Meadows’ concept of Leverage Points, which outlines the “depth” of intervention in ...
Julia Leventon +2 more
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Compensation and Incentives in Medical Networks with Gate-keeping and Case Management [PDF]
, 2008 New approaches in health care, such as e.g. Integrated Delivery Systems, affect the role and tasks of medical suppliers. More and more, medical suppliers are incorporated into the process of guiding patients to medical specialists and hospitals and thus ...
Schumacher, Petra
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Classifying Toric and Semitoric Fans by Lifting Equations from ${\rm SL}_2({\mathbb Z})$ [PDF]
, 2018 We present an algebraic method to study four-dimensional toric varieties by lifting matrix equations from the special linear group ${\rm SL}_2({\mathbb Z})$ to its preimage in the universal cover of ${\rm SL}_2({\mathbb R})$.
Kane, Daniel M. +2 more
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Alexandria Engineering Journal, 2023 The main focus of our discussion is the approximate controllability of non-densely defined Sobolev-type Hilfer fractional neutral Volterra–Fredholm integro-differential systems.
K. Kavitha +2 more
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