A model incorporating mass-transfer effects, electrode kinetics, and homogeneous reaction is presented to describe galvanostatic pulse (PC) and pulse reverse (PR) plating of nickel-iron alloys from a sulfate bath onto a rotating disk electrode. It has been satisfactorily fit to experimental data taken from the literature and then used to investigate the effects of pulse mode and pulse parameters and to compute the transient responses of the partial current densities and concentration profiles. A comparison of the effect of pulse mode on plating confirmed previously reported evidence that PC plating tends to produce alloys with similar iron content to those obtained by dc plating, particularly at high current. PR plating has been shown to be the most effective method of controlling iron content in the alloys. By increasing the ratio of the anodic pulse amplitude to the cathodic pulse amplitude, the extent of anomalous codeposition and the sensitivity of alloy composition to the applied current can be reduced. Analysis of the transient partial current densities confirmed experimental evidence that this improvement is due to preferential dissolution of iron during the anodic pulses. Model DevelopmentThe following assumptions have been made in the development of the model: (i) edge effects on the RDE are not considered and only transport in the direction normal to

Notes on the Structural Analysis of Container Ships (3) ed the transfer function or the response amplitude operator (RAO), Y(f, t2). It can be approximated rather well by the strip method. An unpublished comparison of Germanischer Lloyd between the strip theory and model test shows good agreement concerning vertical, and horizontal shearing forces and moments as well as torsional moments at amidship. Results for an angle of encounter of 45° and for a Froude number of 0.212 are presented in Fig. 2. By structural analysis transfer functions for stresses can be determined from the transfer functions for moments and forces. Response of ship in irregular seaway Once the transfer functions are known, the response of the ship in the irregular seaway can be determined by statistical methods. A study of recordings of seaway effects such as moments or stresses reveals that their departure from their mean values are distributed approximately according to the Rayleigh distribution, Fig. 3. The probability that some given value, Xm, is being exceeded is therefore given by

In the paper presented the behavior of a transversely formed box-girder model subjected to pure bending is discussed, where the deck plating of the model is loaded above the buckling load. The experimental results obtained are in reasonable agreement with theoretical investigations and show the influence of fabrication initiated plate deflections on the buckling and postbuckling behavior of the deck plating clearly. A method is suggested for determining the buckling load of plates having large initial deformations.