Auroral Index for College, Alaska Derived from All-Sky camera Photographs, September 1957- December 1958

NSF Grant No. Y/22.6/327Ye

Summary of electric vehicle dc motor-controller tests

The differences in the performance of dc motors are evaluated when operating with chopper type controllers, and when operating on direct current. The interactions between the motor and the controller which cause these differences are investigated. Motor-controlled tests provided some of the data the quantified motor efficiency variations for both ripple free and chopper modes of operation

Cyberbullying - when does a school authority\u27s liability in tort end?

Cyberbullying in schools is increasing on an alarming rate. The development of the Internet and smartphone technology have increased the potential scope of a school authority’s duty of care for its students. A question frequently asked by educators is “Where does a school authority’s duty of care end in the interconnected, 24/7 world of the Internet?” This paper argues that a duty of care will be owed where the school is in a school/student relationship with its students. That relationship can exist outside the school gates and outside of school hours. There are no decisions of senior appellate courts that deal with a school authority’s liability for cyberbullying. The authors, therefore, analyse the nature of the relationship to identify the key features that must be present to establish the existence of a duty of care. Three features are identified as critical to the existence of the duty of care outside of the normal school hours. They are the extent to which the school authority controls or ought to control a given situation, the extent to which it has encouraged students to participate in a particular activity and the extent to which a school authority is aware or ought to be aware of risks associated with the relevant activity of its students

Baseline tests of the AM General DJ-5E electruck electric delivery van

An electric quarter ton truck designed for use as a postal delivery vehicle was tested to characterize the state of the art of electric vehicles. Vehicle performance test results are presented. It is powered by a single-module, 54 volt industrial battery through a silicon controlled rectifier continuously adjustable controller with regenerative braking applied to a direct current compound wound motor

Evaluating international economic policy with the Federal Reserve's global model

FRB/Global is a large-scale macroeconomic model developed and maintained by the Board's staff. This article provides a historical perspective on the development of the model, gives an overview of its structure, and highlights its dynamic properties with three simulation experiments: a reduction in U.S. government purchases; a depreciation of the U.S. dollar; and an increase in the price of oil exported by OPEC. The article illustrates other uses of FRB/Global by examining the spillover effects of fiscal and monetary policy under alternative European monetary policy regimes.Econometric models ; Economic policy

Stochastic models for atomic clocks

For the atomic clocks used in the National Bureau of Standards Time Scales, an adequate model is the superposition of white FM, random walk FM, and linear frequency drift for times longer than about one minute. The model was tested on several clocks using maximum likelihood techniques for parameter estimation and the residuals were acceptably random. Conventional diagnostics indicate that additional model elements contribute no significant improvement to the model even at the expense of the added model complexity