نتایج جستجو برای ' Balance '

Nonlinear effect is a typical phenomenon for nonlinear systems, which is characterized as the energy of the system input transferred from the frequency modes in the input to the output frequency locations, which are either below or above the input frequency band. The present work is devoted to investigating the distribution of nonlinear effects in one-dimensional chain type structures with local nonlinearity in which only one or few components are of nonlinear property. The results reveal that t...

We study a one-parameter family of symmetric piecewise linear differential systems in R3 which is relevant in control theory. The family, which has some intersection points with the adimensional family of Chua’s circuits, exhibits more than one attractor even when the two matrices defining its dynamics in each zone are stable, in an apparent contradiction to the three-dimensional Kalman’s conjecture. For these systems we characterize algebraically their symmetric periodic orbits and ...

 A μ-way t-solely balanced set is a μ-way (v, k, t) Steiner trade T = {T1, T2, . . . , Tμ} such that Ti and Tj (1 ≤ i < j ≤ μ) Contains no common (t + 1)-subset. The onesolely sets are the most important tool for building Steiner trades. In this article we introduce some techniques for construction the one-solely sets and related Steiner trades.

 This work presents a new finite volume Godunov-type model for predicting morphological changes under the rapidly varying flood conditions with wetting and drying. The model solves the coupled shallow water and Exner equations, with the interface fluxes evaluated by an Harten-Lax-van Leer-Contact (HLLC) approximate Riemann solver. Well-balanced solution is achieved using the surface gradient method and wetting and drying are handled by a non-negative reconstruction approach. The new model i...

Conventional “Balanced Antipodal Vivaldi Antenna” (BAVA) usually suffers from beam-tilting at upper working frequencies. For compensating the beam-tilting, we have proposed a New BAVA. By adding an ovalshaped dielectric lens at the end of the antenna, the beam titling in E-plane was improved within the higher working frequencies. Results show that the antenna has better than 10 dB return loss for the frequency range of 3 to 18 GHz. Simulated radiation patterns successfully verify the...

 We investigated the rationality and accuracy of human-body exergy balance calculation under un-steady state conditions for our immediate thermal environment changing due to a series of behaviour such as walking outdoors and coming into a mechanically air-conditioned space. We set up an experiment that the subjects stayed in two rooms, one with natural ventilation and the other with mechanical air-conditioning. According to “energy” calculation, input energy rate almost the same...

 Human thermal comfort is studied as a countermeasure to the thermal stress in outdoor urban space. Outdoors, people experience the strong impact of solar radiation in states that are unsteady and non-uniform. The feeling of comfort is a mixed sensation that can be easier to improve overall, as compared with a global large-scale effort, and can lead to improved ways of saving energy and reducing costs. Moreover, this can be directly beneficial to human experience and fulfill natural human d...

 Green roofs have a positive effect on the energy performance of buildings, providing a cooling effect in summer, along with a more efficient harnessing of the solar radiation due to the reflective properties found inside the foliage. For assessing these effects, the thermodynamic model was developed as well as the thermo-physical properties of the green roof components were characterized. Its typologies and vegetation styles should also be studied. The proposed model is based on energy bal...

 This paper presents a non-linear model that characterizes the steady state behavior of a system through power balance equations derived for network users. In the formulation, a network user may be a particular generator or load, a power company, a bilateral or multilateral transaction or the pool. By means of a parameter variation, different models are employed to represent network users, starting with ideal current sources and evolving to ideal voltage sources. Currents and voltages alloc...

 Static VAr Compensators (SVCs) can transform phase-to-phase loads into balanced three-phase loads. This paper shows that this function of SVCs is reversible; that is, SVCs can be used to supply power from a single-phase line to balanced three-phase loads. Those three-phase loads then show themselves to the single-phase line as single-phase loads with the desired power factor, even unity.