Big – Bang and Big – Crunch (BB-BC) optimization method for multioptimization of economic load dispatch and emission dispatch of thermal power generating stations is presented using weighted sum method, trade-off solutions are obtained assuming decision makers (DM) requirements by solving optimal power flows. BB-BC optimization which is a nonderivative, population search optimization procedure ...

A fractional order PID (FOPID) control technique for automatic generation (AGC) in a multi-area power system is presented this study. To create reliable controller, variety of strategies were used. The load frequency (LFC) problem implementing different transactions, such as bilateral and Poolco are investigated here. Because any scheme’s performance only good its parameters, the parameters des...

LLC converter design optimization remains a challenging task for varying loads such as in battery chargers. There are numerous L-L-C combinations to choose from space that can satisfy the required voltage gains of application. An accurate magnetic model is essential optimally size passive components according application needs. This paper provides new tool gapped core magnetics optimize transfo...

In this study, a novel bonobo optimizer (BO) technique is applied to find the optimal design for an off-grid hybrid renewable energy system (HRES) that contains diesel generator, photovoltaics (PV), wind turbine (WT), and batteries as storage system. The proposed HRES aims electrify remote region in northern Saudi Arabia based on annualized cost (ASC) minimization power reliability enhancement....

A broad class of dark energy models, which have been proposed in attempts at solving the cosmological constant problems, predict a late time variation of the equation of state with redshift. The variation occurs as a scalar field picks up speed on its way to negative values of the potential. The negative potential energy eventually turns the expansion into contraction and the local universe und...

In general relativity space-time ends at singularities. The big bang is considered as the Beginning and the big crunch, the End. However these conclusions are arrived at by using general relativity in regimes which lie well beyond its physical domain of validity. Examples where detailed analysis is possible show that these singularities are naturally resolved by quantum geometry effects. Quantu...

We use D-instantons to probe the geometry of Misner universe, and calculate the world volume field theory action, which is of the 1+0 dimensional form and highly nonlocal. Turning on closed string tachyons, we see from the deformed moduli space of the D-instantons that the spacelike singularity is removed and the region near the singularity becomes a fuzzy cone, where space and time do not comm...

In [1], KKLT give a mechanism to generate de Sitter vacua in string theory. And recently, the scenario, landscape, is suggested to explain the problem of the cosmological constant. In this scenario, the cosmological constant is a de Sitter vacuum. The vacuum is metastable and would decay into an anti-de Sitter vacuum finally. Then the catastrophe of the big crunch appears. In this paper by conj...

We use D-instantons to probe the geometry of Misner universe, and calculate the world volume field theory action, which is of the 1+0 dimensional form and highly nonlocal. Turning on closed string tachyons, we see from the deformed moduli space of the D-instantons that the spacelike singularity is removed and the region near the singularity becomes a fuzzy cone, where space and time do not comm...