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

Data Mining Practical Machine Learning Tools and Techniques

This book, written by two major figures in adaptive control, provides a wealth of material for researchers, practitioners, and students. While some researchers in adaptive control may note the absence of a particular topic, the book‘s scope represents a high-gain instrument. It can be used by designers of control systems to enhance their work through the information on many new theoretical developments, and can be used by mathematical control theory specialists to adapt their research to practical needs. The book is strongly recommended to anyone interested in adaptive control.

Adaptive Control

A positive temperature coefficient is the term which has been used to indicate that an increase in solubility occurs as the temperature is raised, whereas a negative coefficient indicates a decrease in solubility with rise in temperature.

Effect of Temperature

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A direct semi-solid bar extrusion process is characterised by inserting a feed stock in a container and extruding through a forming die with a punch. Compared to conventional bar extrusion the use of semi-solid material complicates the process due to the requirement of solidification of the material. To achieve the solidification of the semi-solid bar, different basic tool concepts are presented. With a combination of these concepts experiments were carried out using the steel alloy X210CrW12 to detect the influence of the most influencing parameters press velocity, extrusion channel diameter, length and geometry. Numerical simulations enable a better understanding of the process mechanics like temperature development in the billet and forming die as well as the material flow in the deformation zone.

Process Window Determination for Thixoextrusion Processes Using a Steel Alloy

The properties of the lamination of rotating electrical machines made of non-grain oriented electrical steel are the key factor for the efficiency of electric drives. Therefore, low losses and high magnetization over the entire polarization and frequency spectrum are the aim of research activities in the field of NGO steel production and processing. Structural features of the electrical steel like microstructure and texture, lamination thickness, and residual stresses affect the magnetic properties. During the production and processing of non-grain oriented electrical steels, several effects control the microstructure and texture. Moreover, several interdependencies between the parameters of the production and processing steps and the magnetic properties are existing. This paper gives an overview of a joint research project made up of an interdisciplinary team of researcher from the fields of materials engineering, production technology and electrical engineering from five different institutes at three universities. The research focuses and selected results are presented, showing important interactions along the production route of non-grain oriented electrical steels containing 2.4 wt% Si.

Continuous Process Chain Modeling of low-loss FeSi Sheet for Energy-efficient Electrical Drives

Comparison between down‐scaled flat rolling experiments of thin round wire and numerical simulation of those experiments have shown that the production process of manufacturing micro strip out of thin round wire is influenced by size effects. From plane strain compression tests, used as a physical simulation of the rolling process it is concluded that second order size effects of mechanical strength cause decreasing resistance to forming with decreasing wire diameters for rolling experiments with 25% and 50% reduction.

Influences Of Size Effects On The Rolling Of Micro Strip

Innovative product characteristics can be realized by hot roll bonding of two or more layers of different materials. To optimize the roll bonding process, an approach to align the strength differences in both materials by a temperature difference between the layers has been proposed. Therefore, the temperature distribution has to be investigated by finite element (FE) simulations. In these simulations the heat transfer coefficient (HTC) between the two aluminum layers is of great importance. With this coefficient the temperature transfer between the two layers can be determined in order to estimate the temperature field and the material strength difference in the layers.In hot roll bonding there are two ranges for the HTC depending on whether bond formation takes place or not. This effect can be used to determine at which pressures bond formation starts. To evaluate the HTC for this application and to determine its value ranges, a simple setup has been developed. This setup allows conducting experiments under defined temperature and pressure conditions. The resulting force-time measurements were used as input values for inverse FE-simulations, with the goal to gather the HTC by inverse modelling the temperature distributions of the specimens. First results show that the range of the pressure dependent HTCs leads up to 21 kW/(m²K) in the unbonded range. In the range where bonding occurred between the specimens, values over 150 kW/(m²K) were estimated. The data for the HTC was implemented in roll bonding simulations as an interaction property. A comparison between the simulated temperature curve and a measured temperature curve during roll bonding showed a good agreement between the temperature values.

Determination of Thermal Boundary Conditions for Modeling the Hot Roll Bonding Process

Objective The proposed project deals with the investigation of the casting conditions and the required surface conditioning for the coatability of thin steel strips made by direct strip casting. Strip casting is a near-net-shape technology that enables a further clipping of the process route for strip production. The casting process will be investigated as well as an in-line treatment in terms of coatability. This will decrease the gap in knowledge concerning the coating abilities and the surface structure of the direct cast strips.

Gerhard Hirt

Papers

Process Window Determination for Thixoextrusion Processes Using a Steel Alloy

Continuous Process Chain Modeling of low-loss FeSi Sheet for Energy-efficient Electrical Drives

Influences Of Size Effects On The Rolling Of Micro Strip

Determination of Thermal Boundary Conditions for Modeling the Hot Roll Bonding Process

Optimisation of strip casting conditions and surface conditions for coating