There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality.

Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

I and i

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

Probability Distributions.- Linear Models for Regression.- Linear Models for Classification.- Neural Networks.- Kernel Methods.- Sparse Kernel Machines.- Graphical Models.- Mixture Models and EM.- Approximate Inference.- Sampling Methods.- Continuous Latent Variables.- Sequential Data.- Combining Models.

Pattern Recognition and Machine Learning

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Principles Of Fluorescence Spectroscopy

In this chapter, we will restrict our attention to the ferrites and a few other closely related materials. The great interest in ferrites stems from their unique combination of a spontaneous magnetization and a high electrical resistivity. The observed magnetization results from the difference in the magnetizations of two non-equivalent sub-lattices of the magnetic ions in the crystal structure. Materials of this type should strictly be designated as “ferrimagnetic” and in some respects are more closely related to anti-ferromagnetic substances than they are to ferromagnetics in which the magnetization results from the parallel alignment of all the magnetic moments present. We shall not adhere to this special nomenclature except to emphasize effects, which are due to the existence of the sub-lattices.

Ferromagnetic materials

In this study, an efficient magnetic polymeric composite was synthesized from steelmaking waste Steel slag was modified with acrylamide acrylic acid (SSAA) copolymer for removal of methyl orange MO and methylene blue MB from synthetic solutions The SSAA composite was characterized by TGA thermogravimetric analysis, SEM scanning electron microscope, XRD X-ray diffraction, BET Brunauer–Emmett–Teller surface area, and FTIR Fourier transform infrared The adsorption behavior of SSAA for MO and MB was investigated, and the impact of various parameters was examined using one factor at a time (OFAT) and RSM-BBD response surface method-Box Behnken Design The kinetic data of MO and MB were well described with the second-order kinetic model, and the dominant rate-limiting step is the film diffusion The isotherms of Dubinin–Raudshkevish (D–R) and Freundlich well described the MB and MO experimental results, respectively The maximum uptake efficiencies of 97% and 94% and capacities of 47 and 463 mg/g were reported for MO and MB, respectively The thermodynamic investigations suggested favorable, spontaneous adsorption of MO and MB on the SSAA Physical adsorption was found to be the dominating mechanism for MB, while the chemisorption mechanism was reported for MO Those mechanisms were confirmed by the regeneration study, where SSAA was regenerated for MB, and an insignificant drop in the adsorption capacity was noted after five cycles However, a negligible regeneration of the SSAA was achieved for MO ions, which verifies the chemisorption mechanism The reported investigations revealed that the SSAA composite could be used for cationic and anionic dyes removal from wastewater, spontaneously and feasibly, as indicated by the thermodynamic study

Tawfik A. Saleh

Papers

Poly(acrylamide acrylic acid) grafted on steel slag as an efficient magnetic adsorbent for cationic and anionic dyes

Ultrasonication and electrochemically-assisted synthesis of reduced graphene oxide nanosheets for electrochemical sensor applications

A novel cross-linked pH-responsive tetrapolymer: Synthesis, characterization and sorption evaluation towards Cr(III)

Novel graphene modified carbon-paste electrode for promazine detection by square wave voltammetry

Optical Properties of Bismuth Oxide Nanoparticles Synthesized by Pulsed Laser Ablation in Liquids