THE DESIGN AND ANALYSIS OF EXPERIMENTS. By Oscar Kempthorne. New York, John Wiley and Sons, Inc., 1952. 631 pp. $8.50. This book by a teacher of statistics (as well as a consultant for \"experimenters\") is a comprehensive study of the philosophical background for the statistical design of experiment. It is necessary to have some facility with algebraic notation and manipulation to be able to use the volume intelligently. The problems are presented from the theoretical point of view, without such practical examples as would be helpful for those not acquainted with mathematics. The mathematical justification for the techniques is given. As a somewhat advanced treatment of the design and analysis of experiments, this volume will be interesting and helpful for many who approach statistics theoretically as well as practically. With emphasis on the \"why,\" and with description given broadly, the author relates the subject matter to the general theory of statistics and to the general problem of experimental inference. MARGARET J. ROBERTSON

The Design and Analysis of Experiments

Magnetic and dipole moments in indium doped barium hexaferrites

Temperature evolution of the structure parameters and exchange interactions in BaFe12−xInxO19

Recent progress in hydrogen sulphide (H2S) sensors by metal displacement approach

Pecularities of the magnetic structure and microwave properties in Ba(Fe1-xScx)12O19 (x<0.1) hexaferrites

Electron scattering analysis in 2DEG in sputtering-grown MgZnO/ZnO heterostructure

Multiferroicity in La, Pr & Sm doped Z-type strontium hexaferrite

In this article, the effect of the SiO2 layer is demonstrated on dual ion beam sputtered yttria-based memristive devices for the first time. It is found that the effect of thickening of SiO2 layer is extremely detrimental for resistive switching (RS) parameters such as endurance and uniformity of current-voltage characteristics. SiO2 interfacial layer causes the growth of nano stalagmite in the yttria layer. This interfacial layer is also responsible for the origin of pseudo bipolarity in RS characteristics and early failure of the device during endurance testing. The thickness of the SiO2 layer has a positive correlation with deposition temperature and oxygen partial pressure. It is found that the deposition temperature of 300°C and a mixture of Ar:O2 with a ratio of 2:3 shows the best RS characteristics.

Impact of Interfacial SiO 2 on Dual Ion Beam Sputtered Y 2 O 3 -Based Memristive System

Abstract Increasing demand of aerospace industry for more heat resistant and tough material have open up the possibility of the use of Inconel 825 for making of combustor casing and turbine blades. Because of its robust nature, Inconel 825 is a difficult-to-cut material with conventional methods. Wire-cut electrical discharge machining (WEDM), a non traditional method uses thermoelectric erosion principle to produce intricate shape and profiles of such difficult-to-cut material. In this study, various operating parameters of WEDM are optimized using desirability approach and microstructural behavior at optimum combinations was studied. Input parameters viz. pulse-on time, pulse-off time, peak current, spark gap voltage, wire tension, wire feed and performance has been measured in term of material removal rate, surface roughness and wire wear ratio. It has been observed that at 110 machine unit pulse-on time (Ton), 35 machine unit pulse-off time (Toff), 46 volt gap voltage (SV), 120 ampere peak current (IP), 11 machine unit wire tension (WT) and 5 m/min wire feed (WF), the values obtained for material removal rate (MRR), surface roughness (SR) and wire wear ratio (WWR) were 27.691mm2/min, 2.721 μmand 0.117 respectively. Scanning electron microscopy, energy dispersive spectrograph and X-ray diffraction analysis has also been carried out to study the surface characterization. Comparatively less numbers of cracks, pockmarks, craters, and pulled out material were found on work specimen surface and wire electrode surface under standardized conditions, thus maintaining the surface integrity of the machined surface.

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Microstructural analysis and multi response optimization of WEDM of Inconel 825 using RSM based desirability approach

This paper presents multi-objective optimization of aerospace-grade titanium alloy using the Gray–Taguchi approach. Experimentation has been conducted with varying cutting conditions according to T...

Pawan Kumar

Papers

Electron scattering analysis in 2DEG in sputtering-grown MgZnO/ZnO heterostructure

Multiferroicity in La, Pr & Sm doped Z-type strontium hexaferrite

Impact of Interfacial SiO 2 on Dual Ion Beam Sputtered Y 2 O 3 -Based Memristive System

Microstructural analysis and multi response optimization of WEDM of Inconel 825 using RSM based desirability approach

Multi-objective optimization of machining parameters during green machining of aerospace grade titanium alloy using Grey–Taguchi approach: