Introduction to Library Trends 28 (1) Summer 1979: The Economics of Academic Libraries

published or submitted for publicatio

Minimizing federal income taxes when selling, purchasing or changing the form of a business

Thesis (M.B.A.)--Boston University, 195

Time-Evolution of the Power Spectrum of the Black Hole X-ray Nova XTE J1550-564

We have studied the time evolution of the power spectrum of XTE J1550-564, using X-ray luminosity time series data obtained by the Rossi X-Ray Timing Explorer satellite. A number of important practical fundamental issues arise in the analysis of these data, including dealing with time-tagged event data, removal of noise from a highly non-stationary signal, and comparison of different time-frequency distributions. We present two new methods to understand the time frequency variations, and compare them to the dynamic power spectrum of Homan et al. All of the approaches provide evidence that the QPO frequency varies in a systematic way during the time evolution of the signal.Comment: 4 pages, 3 figures; 2001 IEEE - EURASIP Workshop on Nonlinear Signal and Image Processing (June 3-6, 2001), and to appear in the proceeding

Nonlinear Transformation of Differential Equations into Phase Space

Time-frequency representations transform a one-dimensional function into a two-dimensional function in the phase-space of time and frequency. The transformation to accomplish is a nonlinear transformation and there are an infinite number of such transformations. We obtain the governing differential equation for any two-dimensional bilinear phase-space function for the case when the governing equation for the time function is an ordinary differential equation with constant coefficients. This connects the dynamical features of the problem directly to the phase-space function and it has a number of advantages

Approximation of the Wigner Distribution for Dynamical Systems Governed by Differential Equations

A conceptually new approximation method to study the time-frequency properties of dynamical systems characterized by linear ordinary differential equations is presented. We bypass solving the differential equation governing the motion by writing the exact Wigner distribution corresponding to the solution of the differential equation. The resulting equation is a partial differential equation in time and frequency. We then show how it lends itself to effective approximation methods because in the time frequency plane there is a high degree of localization of the signal. Numerical examples are given and compared to exact solutions

ERISA Preemption: Judicial Flexibility and Statutory Rigidity

This Article attempts to describe the ways in which, and the reasons why section 514(a) has caused the courts and Congress so much difficulty. Part I reviews the legislative history of section 514(a), with emphasis on the ambivalence Congress has shown toward its 1974 draftsmanship. Part II attempts to provide a coherent description of the case law that has developed under section 514(a). Part III completes the legislative history by examining the two instances in which experience compelled Congress to revise section 514. Finally, Part IV discusses examples of problems courts have faced when crafting a federal common law of employee benefits in light of section 514 and concludes that the peculiar absence in section 514 of any recognition of state policies has had an adverse effect on the common law process. The primary shortcoming of section 514 is that, although it establishes a good starting point for thinking about ERISA preemption, it falls short both as a practical rule and as a guide to principled decisionmaking. Courts have thus had little choice but to create a federal common law of ERISA, including preemption, in spite of, and to some extent hindered by, the literal language of the statute