Thesis (M.S.)--Rochester Institute of Technology, 2006. / Typescript. Includes bibliographical references (leaves 61-69).

The purpose of this study is to compare Negro and white responses to the Rorschach.

Droplet formation in inkjet cartridges has been studied for several decades to improve print qualities. Currents and rigid nozzle plates are used inside the cartridge to fix the size of droplets exiting the chamber. This research is focused on studying the effect of nozzle flexibility on droplet formation. A flexible nozzle can be modeled as an flexible annular plate with a clamped outside edge. In this thesis, plate vibration equations are studied for an annular shape. An analytical solution is formed for the small deflection plate equation. To solve the large deflection plate vibration equation, Galerkin's method is used. Droplet formation is predicted by a one dimensional fluid dynamic model. An integrated plate vibration and droplet formation model is created with these basic building blocks. Results from simulation indicate flexible plates yield shorter droplet breakoff time and longer breakoff distance while generating a slightly droplet compared to a rigid nozzle. / Graduation date: 2004

Thesis (M.S.) in Chemical Engineering--University of Maine, 2002. / Includes vita. Bibliography: leaves 182-193.

Thesis (Ph. D.) in Chemical Engineering--University of Maine, 2001. / Includes vita. Includes bibliographical references (leaves 141-149).

No description available.

No description available.

The magnetic particle inspection (MPI) method is a widely used non destructive testing (NDT) technique for ferrous structures. Magnetic inks used in MPI are suspensions of fine ferro/ferrimagnetic particles which, when applied to a magnetized test specimen, delineate surface flaws. This work is an investigation of some of the properties of magnetic ink systems and some aspects of their interaction with defect leakage flux. Reviews of magnetism, the MPI method and leakage flux at defects are given. The construction, characterization and automation of a 1.2 T electromagnet vibrating sample magnetometer, used for magnetic measurements on the inks, is described. The instrument has a resolution of better than l0(^-9) JT(^-1) . A 2D model of indication formation in MPI, based upon the simulation of many particles in the neighbourhood of a defect, is presented. Results of the role of several of the model parameters are given. Results indicate that carrier coefficients of viscosity at the lower end of the range investigated (η = 0.3 mPas) are optimum. The size and contrast of an indication increases with defect size. The contrast and rate of formation of contrast increase with defect aspect ratio. The effect of the contrast paint layer thickness indicates that the recommendation of the British Standard, BS 5044 (1973), is qualitatively correct. Experimental observations of particles in field gradients reveals a discrepancy between theoretical and observed behaviour which is attributed, in particular, to unobservable voids in the particles. Detailed characterization of the particles shows them to be aggregates of 20 - 200 nm crystallites which are probably single domain particles. The morphology of larger aggregates is related to measurements of the low field susceptibility. Evidence from intensive magnetic measurements supports the relationship between magnetic properties and aggregate characteristics. A 'In t' magnetic viscosity effect is reported. At 77 K, the coefficient of magnetic viscosity has a maximum near the coercivity field.

No description available.

Thesis (Ph.D.)--Auburn University, 2007. / Abstract. Vita. Includes bibliographic references (ℓ. 106-110)