Reliability and safety in flight is extremely necessary and that depend on the adoption of proper maintenance system. Therefore, it is essential for aircraft maintenance companies to perform the manpower scheduling efficiently. One of the objectives of this paper is to provide an Integer Programming approach to determine the optimal solutions to aircraft maintenance planning and scheduling and ...

In recent years several high quality Sturm-Liouville software packages have been written (e.g., SLEDGE, SLEIGN, the NAG routine SL02FM). All excel at providing eigenfunction estimates at a nite set of points but only the NAG routine provides interpolation capability, and this by a fairly crude method (especially when compared with the sophistication of its eigenvalue solver). We describe an acc...

Positioning of mobile robots basically calculated using odometry information. Odometry from the wheel’s encoder is mostly used for simple and inexpensive implementation for determining the relative localization of a mobile robot. This paper deals with the estimation of better relative localization of a two wheeled differential drive robot by means of odometry by considering the influence of par...

ARS-Media for Excel is an ion solution calculator that uses "Microsoft Excel" to generate recipes of salts for complex ion mixtures specified by the user. Generating salt combinations (recipes) that result in pre-specified target ion values is a linear programming problem. Excel's Solver add-on solves the linear programming equation to generate a recipe. Calculating a mixture of salts to genera...

There is a fundamental mismatch between the computational basis of spreadsheets and our knowledge of the real world. In spreadsheets numerical data is represented as exact numbers and their mutual relations as functions, whose values (output) are computed from given argument values (input). However, in the real world data is often inexact and uncertain in many ways and the relationships, i.e., ...

The sorption of basic dyes onto magnetic nanosorbent is commonly used as a novel material to combat powdered activated carbon, which difficult handle and separate during water wastewater treatment. This adsorption method implemented in treatment due its low cost high performance. To explore the feasibility adsorption, six different nonlinear isotherm models were applied introduced evaluate perf...

Equipped with its Solver and-in and VBA, Microsoft Excel makes an ideal educational platform for design analyses of fluid-thermal systems. This paper illustrates this capability by considering a common type these systems; which is the double-pipe heat exchanger. While used optimisation analysis, VBA development user-defined function (UDF) that determines optimum standard-pipe size system.

When it comes to making of certain decisions everyday/routine or specific, which often imply planning, programming, selection the most favorable alternative, financing realization business task, is mostly based on data analysis. Criteria are imposed that occasion diverse and sometimes mutually opposed. Problems posed decision maker unstructured so there no mathematical algorithm for solving the...

iran’s vast common natural gas resources and the necessity to extract and export it as liquefied natural gas (lng) to distances more than 3000km opens a lucrative field for researchers to optimize lng cycles. in this article heat integration in cryogenic cycles by determining interacycle partition temperature and optimizing refrigeration features like subcooler, presaturator, aftercooler, reboi...