Michael J. Adams

Bio: Michael J. Adams is an academic researcher from University of Essex. The author has contributed to research in topics: Laser & Semiconductor laser theory. The author has an hindex of 42, co-authored 418 publications receiving 9659 citations. Previous affiliations of Michael J. Adams include University of Southampton & University of Gaziantep.

An Analysis of Corporate Donations: United Kingdom Evidence

Abstract: Drawing a framework from stakeholder theory, this study uses 1994 data drawn from 100 United Kingdom listed companies to test empirically whether the level of discretionary donations made by companies to charitable, social and political causes is related to four company-specific factors, namely leverage, company size, profitability and ownership structure Consistent with our hypotheses, the results indicate that the decision to contribute funds to charities and other bodies is positively related to company size and profitability and negatively related to leverage However, the study provides no support for the view that there is a link between discretionary donations and a company's ownership structure

Analysis of semiconductor laser optical amplifiers

Abstract: A new analytical model for semiconductor laser amplifiers is presented. It has the virtue of avoiding excessive numerical computation and yet retaining sufficient accuracy for most cases of interest. The essentially new feature is the use of an appropriate mean photon density obtained by averaging the axial field distribution along the cavity length. Calculated results are presented for gain, saturation power and tuning characteristics, and their sensitivity to current density, facet reflectivities, and the spontaneous emission coefficient is explored.

A comparison of active and passive optical bistability in semiconductors

Abstract: A comparison is presented between optical bistability in laser amplifiers and in passive Fabry-Perot cavities. The basis for comparison is afforded by a new analysis of optical amplifiers which encompasses the cases of passive refractive and absorptive bistability as special limiting cases. The results indicate that amplifiers have advantages of lower input intensity requirements (by a factor of 103) and reduced sensitivity to wavelength by comparison with passive cavities; experimental results indicate an input power of -30 dBm is required for active bistability. Facet coating requirements for active and passive optimum configurations are also discussed.

I and i

Abstract: 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 …

Inhibited Spontaneous Emission in Solid-State Physics and Electronics

Abstract: It has been recognized for some time that the spontaneous emission by atoms is not necessarily a fixed and immutable property of the coupling between matter and space, but that it can be controlled by modification of the properties of the radiation field. This is equally true in the solid state, where spontaneous emission plays a fundamental role in limiting the performance of semiconductor lasers, heterojunction bipolar transistors, and solar cells. If a three-dimensionally periodic dielectric structure has an electromagnetic band gap which overlaps the electronic band edge, then spontaneous emission can be rigorously forbidden.

Regression Diagnostics: Identifying Influential Data and Sources of Collinearity

Abstract: 1. Introduction and Overview. 2. Detecting Influential Observations and Outliers. 3. Detecting and Assessing Collinearity. 4. Applications and Remedies. 5. Research Issues and Directions for Extensions. Bibliography. Author Index. Subject Index.