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

Obstetrics and gynecology.

The New Encyclopaedia Britannica

Tansy fruit mediated greener synthesis of silver and gold nanoparticles

Spectrometric Identification of Organic Compounds

Purpose – To evaluate the inhibition efficiency (IE) of polyvinyl alcohol (PVA) in controlling the corrosion of carbon steel immersed in neutral aqueous solutions containing 60 ppm of Cl−, in the absence and presence of Zn2+. To investigate the influence of sodium sulphite (Na2SO3), sodium dodecyl sulphate (SDS), pH and duration of immersion on the IE of PVA‐Zn2+ system. To analyse the protective film formed on the metal surface.Design/methodology/approach – The IE has been evaluated by weight loss method. The protective film was analysed by FTIR and fluorescence spectra.Findings – A formulation consisting of 100 ppm of PVA and 75 ppm of Zn2+ offered 81 per cent IE to carbon steel immersed in a solution containing 60 ppm of Cl−. A synergistic effect on inhibition of a combination of PVA and Zn2+ was observed during the tests. The protective film consisted of the Fe2+‐PVA complex and Zn(OH)2. It was found to be UV‐fluorescent. When SDS was added to the PVA‐Zn2+ system, the mixture showed maximum IE at the ...

Corrosion behaviour of carbon steel in polyvinyl alcohol

Synergistic and antagonistic effects existing among polyacrylamide, phenyl phosphonate and Zn2+ on the inhibition of corrosion of mild steel in a neutral aqueous environment

The inhibition efficiency (IE) of an aqueous extract of beet root (BR) in controlling corrosion of carbon steel in well water in the absence and presence of Zn 2+ has been evaluated by mass loss method The formulation consisting of 4 mL of BR extract and 50 ppm Zn 2+ offers 98% inhibition efficiency to carbon steel immersed in well water A synergistic effect exists between BR extract and Zn 2+  Addition of N-Cetyl-N,N,N – trimethylammonium bromide (CTAB) does not change the excellent inhibition efficiency of the BR – Zn 2+ system The BR – Zn 2+ system shows excellent IE up to 7 days Polarization study reveals that this formulation controls the cathodic reaction predominantly AC impedance spectra reveal that a protective film is formed on the metal surface FTIR spectra reveal that the protective film consists of Fe 2+ - betanin complex and Zn(OH) 2 The film is found to be UV - fluorescent

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Corrosion Inhibition by Beet Root Extract

To replace the environmentally hazardous chromates, several non-chromates have been used as corrosion inhibitors. Extracts of plant materials top the list. The plant extracts are environmentally friendly, non-toxic and readily available. These extracts contain many ingredients. They contain several organic compounds which have polar atoms such as O, N, P and S. They are adsorbed onto the metal surface through these polar atoms; protective films are formed. Adsorptions of these ingredients obey various adsorption isotherms. The films have been analyzed by many surface analysis techniques such as AFM, FTIR, UV, Fluorescence spectra and SEM.

Green corrosion inhibitors: An overview

The inhibition efficiency (IE) of an aqueous extract of white flower, namely, Hibiscus rosa-sinensis Linn., in controlling corrosion of carbon steel immersed in an aqueous solution containing 60 ppm of Cl−has been evaluated by the mass loss method. The flower extract (FE) shows good IE. In the presence of Zn2+, excellent IE is shown by the flower extract. A synergistic effect exists between the flower extract and Zn2+. The mechanistic aspects of corrosion inhibition have been investigated by polarization study and AC impedance spectra. Polarization study reveals that the formulation consisting of flower extract and Zn2+ functions as a mixed inhibitor. AC impedance spectra reveal that a protective film is formed on the metal surface. The active principle in the flower extract is quercetin-3-O-glucoside. This has been confirmed by UV-visible absorption spectra. The protective film formed on the metal surface has been analyzed by FT-IR and AFM spectra. It is found that the protective film consists of Fe2+-qu...

Susai Rajendran

Papers

Corrosion behaviour of carbon steel in polyvinyl alcohol

Synergistic and antagonistic effects existing among polyacrylamide, phenyl phosphonate and Zn2+ on the inhibition of corrosion of mild steel in a neutral aqueous environment

Corrosion Inhibition by Beet Root Extract

Green corrosion inhibitors: An overview

Corrosion inhibition of carbon steel in low chloride media by an aqueous extract of hibiscus rosa-sinensis linn