A Substantive Non-Solution To The Problem Of Unity

Russell is commonly accused of failing to solve Bradley’s problem of unity. In this paper I argue that the problem doesn’t really pose a distinctively philosophical question; that Russell’s account of unity exposes the problem as unworthy of an answer. I accept that this isn’t a solution, but it does constitute a substantive non-solution! Furthermore, some scholars have read in Russell’s writings a confession of guilt to the effect that he was defeated by the problem of unity: this, I argue, is a misreading of the texts in question

Omnipotence: Dean Zimmerman, Negative Nelly, and the Divine Delegates

Should an omnipotent being be able to limit its own power? Along with Swinburne, Dean Zimmerman answers in the affirmative. My intuitions push in the opposite direction. The ability to limit one's own power constitutes a vulnerability. In this paper, I argue that a great deal hangs on this issue. If God cannot revoke His own omnipotence, then only a necessarily existent being can ever create anything truly ex nihilo. Moreover, if God cannot revoke His own omnipotence, then it turns out that theism entails idealism. No wonder that Zimmerman resists. I prefer to take the plunge and endorse idealism

Quantitative measurement of the composition of Al_xGa_(1−x)As heterostructures using a simple backscattered electron detector

We describe a technique for the quantitative measurement of composition in Al_xGa_(1−x)As heterostructures using a simple solid‐state backscattered electron detector in a scanning electron microscope. Calibration data are presented and are shown to be consistent with the Castaing [Adv. Electron. Electron Phys. 13, 317 (1960)] theory. The technique is applied to image representative Al_xGa_(1−x)As heterostructures including a graded index separate confinement heterostructure (GRINSCH) laser structure

Mechanical evaluation of polylactic acid (PLA) with nominal Hydroxyapatite filler for use in biomedical implants

Abstract only availableAn active area of research in the biomedical implant field is poly lactic acid (PLA). Polylactic acid is very interesting material for this field because it is a biocompatible and biodegradable material. One downside to using Polylactic acid PLA in biomedical implants is that it mechanical strength is much lower than that of its metal counterparts. However polylactic acid's many material attributes such as being biocompatibility and biodegradability make it a very promising and useful material if the mechanical properties were increased. In attempt to increase the bending strength of the Polylactic acid a Hydroxappatite filler was used. A mold was fabricated and samples were made using the heating press method. The samples were then test under three point bending to determines there bending strength using ASTM standard D5023-07. Pol lactic acid (PLA) was tested ranging from zero percent Hydroxyappattie filler to five percent Hydroxyappatite filler. Pure polylactic acid PLA was used as a base for comparisons. From these test to date the polylactic acid has shown a significant improvement in bending strength. This is a very promising result for polylactic acid's future in the biomedical field. Furthermore if it can be demonstrate that similar increases in bending strength in our polylactic acid samples can be demonstrated in actual bone screws or plates the increase in mechanical properties would have numerous implications for poly lactic acid in the biomedical field.MU Undergraduate Research Scholars Progra

Application of selective epitaxy to fabrication of nanometer scale wire and dot structures

The selective growth of nanometer scale GaAs wire and dot structures using metalorganic vapor phase epitaxy is demonstrated. Spectrally resolved cathodoluminescence images as well as spectra from single dots and wires are presented. A blue shifting of the GaAs peak is observed as the size scale of the wires and dots decreases

Facet modulation selective epitaxy–a technique for quantum-well wire doublet fabrication

The technique of facet modulation selective epitaxy and its application to quantum-well wire doublet fabrication are described. Successful fabrication of wire doublets in the AlxGa1–xAs material system is achieved. The smallest wire fabricated has a crescent cross section less than 140 Å thick and less than 1400 Å wide. Backscattered electron images, transmission electron micrographs, cathodoluminescence spectra, and spectrally resolved cathodoluminescence images of the wire doublets are presented

Nanometer scale wire structures fabricated by diffusion-induced selective disordering of a GaAs(AlGaAs) quantum well

A shallow zinc diffusion technique is used to selectively disorder a GaAs quantum well creating nanometer scale wire structures. Spectrally resolved cathodoluminescence images of the structures are presented as well as local spectra of cathodoluminescence emission from the structures. Blue shifting of the luminescence from the wire structures is observed