Papers by Keyword: Optimal

Abstract: Because of The low complexity of passive filters (PF) compared to the active filter, their high efficiency, their ease of installation and their different topologies,theyremained the devices required in the power system. In order to minimize the harmonic distortion produced by the large industrial loads, harmonic filters should, therefore, be designed with the utmost rigor, because a poorly designed filter may amplify the undesired harmonics. The determination of the PFcomponents requires both adetailed study ofthe power system parameters, which influence the efficiency and economic viability of the harmonic compensation and the reactive power required by the load.This article studies the use of the Cuckoo optimization algorithm (COA), in order to designpassive filters with an improved power quality and reduced cost. The optimal filters are connected concurrently to the power system so that each individual Harmonic distortion respects the recommended limits. The results show that the optimized (PF) is effective, and has a lower cost.

Abstract: This paper considers the bicriteria scheduling problem of minimizing the maximum tardiness and total flowtime on single machine with zero release dates. The problem is NP hard, though Early Due Date (EDD) and Shortest Processing Time (SPT) rules yielded optimal solutions for maximum tardiness and total flowtime, respectively if each criterion were to be considered singly. Thus, the values of each of the criteria for the two proposed heuristics; AA and SA were compared to the optimal solution of the sub problems. Results of computational experiment on job sizes varies from 5-150 jobs showed that the SA heuristic is preferred over AA. This is because the heuristic SA yielded maximum tardiness and total flowtime not significantly different from the EDD and SPT results, respectively at 99% significant level. Though AA yielded optimal for total flowtime, the maximum tardiness results is significantly different from the EDD results.

Abstract: Environmental concerns, dependency on imported petroleum and lower cost alternative to gasoline always motivated policymakers worldwide to introduce electric vehicles in road transport system as a solution of those problems. The key issue in this system is recharging the electric vehicle batteries before they are exhausted. Thus, the charging station should be carefully located to make sure the vehicle users can access the charging station within its driving range. This paper therefore proposes a multi-objective optimization method for optimal placement of quick charging station. It intends to minimize the integrated cost of grid energy loss and travelling of vehicle to quick charging station. Due to contrary objectives, weighted sum method is assigned to generate reference Pareto optimal front and optimized the overture by genetic algorithm. The results show that the proposed method can find the optimal solution of quick charging station placement that can benefit electric vehicle users and power grid.

Abstract: A bacterium strain named L-g6 isolated from kitchen garbage, through 16s rRNA sequencing and Biolog GEN III MicroPlate analyzes, was identified as Bacillus coagulans. In the present study, the optimal growth conditions of B.coagulans L-g6 was at 45°C, pH 7 and in the growth of 6 h reached the end of logarithmic phase. B.coagulans L-g6 can break down cellulose, starch, protein, fat; and the best decomposition effect is protein, followed by starch and cellulose, less fat. In total, B.coagulans L-g6 can be used as a starter production scale degradation of kitchen waste. The research will contribute to the development of micro-ecological preparation of B.coagulans L-g6.

Abstract: Geometric configurations such as hull shape, shell thickness, stiffener layout, and type of materials are the key factors influencing the structural performance of pressure hulls. The aim of this study is to maximize the structural efficiency of elliptical deep-submerged pressure hull under hydrostatic pressure. Minimize the buoyancy factor of a submarine pressure hull under hydrostatic pressure was proposed as an objective function for both composite and steel models. The thickness and the orientation angle of each layer, the radii of the ellipse and the operating depth are taken as design variables. Also, the shell buckling strength and the angle-ply laminated failure strength are considered in the case of composite model. In the other hand, the shell thickness, the radii of the ellipse, the stiffeners offsets, the stiffeners dimensions, and the operating depth, are selected as design variables for steel model with shell buckling and materials yielding constraints. The analysis is performed using commercial finite element analysis software ANSYS. Additionally, a sensitivity analysis is performed to study the influence of the design variables on the structural optimum design. Results of this study provide a valuable reference for designers of underwater vehicles.

Abstract: This paper proposes a methodology for analysis, evaluation and selection of the optimal variant for systems designed to ensure thermal comfort in residential buildings. It identifies as a tool that can analyze in detail the technical and economic point of view, the characteristics of a thermal system (closing elements of a building) and heating equipment, subsequent recovery process of the energy potential of multiple energy resources - can provide in terms of cost optimal the thermal comfort.

Abstract: The objective of any construction work is defined as the optimal use of resources, it is focused on building efficiency, so as to ensure quality in reaching the minimum construction costs and ensure environmental protection, safety at work. The building production is affected by many factors. With some we can count, but we cannot predict some for certain in advance. The essential precondition for successful implementation of a construction is thorough and timely preparation of pre-production and production engineering (technology designing), which provides for the effective implementation of the works.

Abstract: A continue method based on relaxation is applied to solve the unit commitment problem (UCP). At first, the primal UCP is reformulated as a simple mixed integer quadratic programming (MIQP), and then the MIQP is solved by interior point method (IPM) and commercial software CPLEX. The first continues problem, UCP without integer constraints, can be solved by IPM to get the no integer solution. The second continues problem, an equivalent continues problem of UCP, can be solved starting from the solution obtained in first problem.

Abstract: Retracted paper: RPCs must work. Here, we demonstrate the refinement of forward-error correction. We disconfirm that though Smalltalk can be made interactive, virtual, and optimal, cache coherence and redundancy can collaborate to solve this issue.

Abstract: The optimal analytical conditions of sodium salvia miltiorrhiza are detected by HPLC methods. SinoChrom ODS-BP C18 is selected as chromatographic column. The optimal experimental conditions under 280 nm wavelength UV detector include the column temperature: 28°C, ratio of methanol/water: 25/75 (v/v), and flow rate: 1.0ml/mol. The correlation coefficient is 0.9983, and RSD is 1.4%, when the linear range is 0.15~1.8μg/μL. In the experiment, the method is verified to be simple and reliable, and which can be used for the quality control in process of salvia miltiorrhiza extraction and purification.