Huron Stamp Mill, Portage Lake

Stereograph

Huron Stamp Mill, Houghton

Stereograph

Scott's standard postage stamp catalogue. The encyclopedia of philately.

Vols. for 1943- issued in 2 parts.

Characteristics of food stamp households, August 1981 : preliminary report.

"July 1982."

Introduction to stamp collecting /

Mode of access: Internet.

Characteristics of food stamp work registrants.

"May 1987."

Physicists, stamp collectors, human mobility forecasters

One of the two reviewers studied in high school to be a physicist. In the end, he became something else, but he never lost his awe of physics. The other reviewer never intended to become a physicist, but he sometimes asks himself why he didn’t become one. Today, they are both sociologists who practice their science on an action theory basis and believe that regularities exist in the world of social actions which can be perceived, understood, explained – and even used for making predictions.

Memorandum of Agreement The University of Maryland, Adele H. Stamp Student Union Leadership & Community Service-Learning and Universidad de Cuenca and Ixa Tours

English

Different approaches to reduce shaft voltage in AC generators

This paper presents several shaft voltage reduction techniques for doubly-fed induction generators in wind turbine applications. These techniques includes: pulse width modulated voltage without zero vectors, multi-level inverters with proper PWM strategy, better generator design to minimize effective capacitive couplings in shaft voltage, active common-mode filter, reducing dc-link voltage and increasing modulation index. These methods have been verified with mathematical analysis and simulations.

A bidirectional two-leg resonant converter for high voltage pulsed power application

A high voltage pulsed power supply is proposed in this paper based on oscillation between an inductor and a capacitor in an LC circuit. A two-leg resonant circuit, supplied through an inverter with an alternative voltage waveform, can generate output voltage up to four times an input voltage magnitude. Bipolar and unipolar modulations are used in a single phase inverter to analyse their effects on the proposed resonant converter. Simulations have been carried out to evaluate the proposed topology and control.