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The coupled tank liquid level control system approximated by the second order plus time delay (SOPTD) model was considered and the proposed improved relay tuning method was applied to calculate the corrected ultimate gain (Ku). It was found that the error in calculation of ultimate gain by proposed methods has been reduced considerably than that of conventional method. The corrected Ku was used...

On March 4, Dr. Oppenheimer replied to General Nichols’ letter of December 23, 1953. The complete text is printed below.

The fact that tenses can be exploited by speakers as a way to attribute (a part of) an utterance to others is well known —Chafe and Nichols (eds.) (1986); Dendale and Tasmowski (eds.) (2001); Squartini (2001)—, although it has not received much attention in Spanish grammars. In this paper we will focus on what we will call quotative readings of the Spanish Imperfecto de indicativo (hereinafter,...

Without a foundation of effective relationships, efforts to manage the flow of materials and information across the supply chain are likely to be unsuccessful (Supply Chain Challenges 2003; Handfield and Nichols 2002). Partnering between firms is one way to find and maintain competitive advantage (Mentzer, Min, and Zacharia 2000; Mohr and Spekman 1994). The ability to effectively and efficientl...

We discuss a class of generalized divided difference operators which give rise to a representation of Nichols-Woronowicz algebras associated to Weyl groups. For the root system of type A, we also study the condition for the deformations of the Fomin-Kirillov quadratic algebra, which is a quadratic lift of the Nichols-Woronowicz algebra, to admit a representation given by generalized divided dif...