Implementation of the new minimum resultant error approach to extract elastic-plastic properties of titanium nitride thin film by nanoindentation, finite element analysis, and modified dimensional analysis

Obtaining the plastic properties of thin film coatings has been the main challenge for decades. Implementing the hybrid methods seems to be an applicable way to address this issue. Unfortunately, limitations of nonunique answers together with the need for enormous amount of calculations are counted as the main challenges. To overcome such difficulties, a modified dimensional analysis method is proposed, which is able to reduce the number of dimensionless parameters. Another novel algorithm named “minimum resultant error method” is developed to provide proper criteria to investigate the compliance of the analytical results with empirical data. With this algorithm, yield stress, strain hardening exponent, and strain hardening coefficient are extracted as unique values by using a single indenter nanoindentation results. The simulation results are processed with combined modified dimensional analysis method and minimum resultant error method algorithms. The effects of interlayer, friction coefficient, and indenter tip radius are investigated. Error analysis to the modulus of elasticity is undertaken and the results show less than 2% error for the infimum point, while the individual dimensionless functions errors are below 3.4%. According to the results, this new approach is well-coped with the earlier studies.

PENERAPAN METODE FUZZY MAMDANI UNTUK MEMPREDIKSI JUMLAH PRODUKSI KARET (STUDI KASUS: DATA PERSEDIAAN DAN PERMINTAAN PRODUKSI KARET PADA PTP NUSANTARA XIV (PERSERO) KEBUN AWAYA, TELUK ELPAPUTIH, MALUKU-INDONESIA)

Good corporate management will determine the development of a company. In addition, the necessary production planning is also required to achieve maximum profit. This study uses data from PTP Nusantara XIV (Persero) Awaya Garden, Teluk Elpaputih, Maluku Province Indonesia, which is engaged in the production of raw rubber. This research uses Fuzzy Mamdani method to predict the amount of rubber production based on the demand data, inventory and production of rubber per day in April 2016. From the research result obtained the exact amount of rubber production with the percentage of truth value equal to 87,83% and the resultant error is 12,17%.Keywords : Demand, Fuzzy Logic Mamdani Method, Inventory, Production.

Estimating collectable solar energy by partially shaded collectors using custom-designed charts and tables: demonstration for typical Zimbabwe locations

In this paper, an approach for the estimation of insolation available to a solar energy collector that may be shaded temporally by external horizon obstructions is described. This approach uses, in place of complicated mathematical expressions or sophisticated specialized computer software, a set of custom-designed charts and tables, and a simple equation, to evaluate the temporal radiation income to the solar collector. The solar position diagram or sun-chart is first used to determine shading status, and then a package of charts and tables is used to evaluate a suitable tilted-plane sky model for collectable insolation. The approach is convenient for use by the average solar energy designer who might not have background training in the intricacies of solar geometry and meteorology. Although in the present case, the charts and tables have been designed to be applicable in Zimbabwe and for the standard flat plate configuration – equator facing and tilt equal to latitude, they can also be produced for any other location and collector configuration. A major approximation in the procedure was to neglect the effects of shading on diffuse radiation availability. The resultant error was analysed and was concluded negligible for reasonably likely cases involving low-tilt collectors.

Error Synthesis

This paper discusses the drawbacks of observational methods of analysing navigational errors and shows the advantages of a synthesizing technique, whereby the effect of any change in the magnitude and distribution of a component error upon the overall resultant error can be evaluated and examined. To this end a computer program has been developed which is capable of accepting both analytical and numerical statistical distributions, representing errors in the components, and combining them to yield the overall effective error. A new error distribution better representative of many navigational error distributions is introduced. The work described is applicable to the investigation of any error which depends upon the interaction of many component errors and is not restricted to the navigation field. An extension of the method to mixed samples is indicated.The paper describes the final step in the development of a universal computer program aimed at synthesizing navigational errors in order that they can be used in evaluating their effect on any proposed A.T.C. system. The investigation was commenced at the College of Aeronautics in 1963 and has been the subject of several published papers during the interim period.

Errors resulting from thickness of point quadrats

When the needles used for point quadrat analyses have appreciable thickness, this causes overestimation of leaf area. A theoretical study, supported by practical trials, shows that the resultant error in estimates of "relative frequency" doubles with a doubling of quadrat diameter or a halving of leaf breadth. With the point quadrat techniques that have been in normal use the errors often exceed 50% and the estimates obtained are usually less accurate than visual estimates. However, results of sufficient accuracy for rough work can be obtained by using a narrow quadrat needle and applying correction factors; and errors can be altogether avoided by recording contacts with the sharpened point, but not the sides, of a needle gradually lowered through the vegetation.