Article

Slab track on the Cologne-Rhine/Main line: The right decision

December 2002

Authors:

Deutsche Bahn

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Integrated process design in the railway field

Article

Sep 2001

P. Ablinger

Ever-shorter lead times for the completion of new railway Pines are necessitating a shift away from processes based on the division of tasks. Such requirements can only be met safely and efficiently in the reality of construction site operation by using integrated process design.

Slab track surveying and set-up - A system concept

Article

Sep 2001

P. Ablinger

Efficient and high-quality manufacture of slab track entails using specific methods for surveying and setting up that function reliably in construction site conditions. The methods described in the article can be used both for all monolithic designs (eg Rheda) and for slab track designs with elastic-mounted sleepers (eg Bözberg, Euroblock); at the same time, they open up new possibilities for construction site logistics. These industrial-type working methods were successfully used to lay 126 km of slab track on the new Cologne - Rhine/Main line.

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Fundamental limitations for control of unstable S ISO plants

January 1970

This paper examines the fundamental limitations on closed-loop performance imposed by instability in the plant (Right Half Plane (R HP) poles). The main limitation is that instability requires active use of plant inputs, and we quantify this is terms of tight lower bounds on the input magnitudes required for disturbance and measurement noise rejection. These new bounds involve the -norm, which ... [Show full abstract] has direct engineering significance. The output performance in terms of disturbance rejection or reference tracking is only limited if the plant has R HP-zeros, and for a one degree-of-freedom controller the presence of R HP-poles further deteriorate the response, whereas there is no additional penalty for having R HP-poles if we use a two degrees-of-freedom controller. It is important to stress that the derived bounds are controller independent and that they are tight, meaning that there exists controllers which achieve the lower bounds.

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Counting staircases in integer compositions

October 2016 · Online Journal of Analytic Combinatorics

The main theorem establishes the generating function F which counts the number of times the staircase

1^+2^+3^+\cdots m^+

fits inside an integer composition of n. \begin{equation*} F= \dfrac {k_{m}-\frac {qx^{m}y}{1-x}k_{m-1}}{(1-q)x^{\binom ... [Show full abstract] {m+1}{2}}\left(\frac{y}{1-x}\right)^{m}+\frac{1-x-xy}{1-x}\left(k_{m}-\frac{qx^{m}y}{1-x}k_{m-1}\right)}. \end{equation*} where \begin{equation*} k_{m}=\sum_{\j=0}^{m-1}x^{mj-\binom {j}{2}}\left(\frac {y}{1-x}\right)^{j}. \end{equation*} Here x and y respectively track the composition size and number of parts, whilst q tracks the number of such staircases contained.

Article

Exponential synchronization between two classes of chaotic systems

March 2009 · Chaos Solitons & Fractals

Yeong-Jeu Sun

In this paper, the concept of exponential Synchronization is introduced and the chaos synchronization between uncertain Genesion system and Rossler system is investigated. Based on the time-domain approach, a tracking control is proposed such that uncertain Genesion system exponentially synchronizes the Rossler system with any pre-specified exponential convergence rate. Finally, a numerical ... [Show full abstract] example is provided to illustrate the use of the main results. (c) 2007 Elsevier Ltd. All rights reserved.

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SEARCHING FOR A PHILOSOPHY OF HISTORY

May 2018

Terrance Quinn

I wonder if you are familiar enough with the main work of Bernard Lonergan, Insight, to have a sense that I am on the right track when I describe it as a successful search for a philosophy of history. And if you are familiar with his theological works, and his Christian orientation, then you will agree that his searching for such a philosophy was dominated by a desire to arrive at an adequate ... [Show full abstract] theology of history. Indeed, is that not the message of the Epilogue of Insight? To get some sense of that achievement, it can help to retrace Lonergan’s journey through Insight, but now with that long-game as a guide in our reading.