This article reviews the surface science of the heterogeneous olefin polymerization catalysts. The specific focus is on how to prepare and characterize stereochemically specific heterogeneous model catalysts for the Ziegler-Natta polymerization. Under clean, ultra-high vacuum conditions, low-energy electron irradiation during the chemical vapor deposition of model Ziegler-Natta catalysts can be...

The aim here is to emphasise the topological and geometric structure that the Ziegler spectrum carries and to illustrate how this structure may be used in the analysis of particular examples. There is not space here for me to give a survey of what is known about the Ziegler spectrum so there are a number of topics that I will just mention in order to give some indication of what lies beyond wha...

Tilman Laubert ([email protected]) Jens K Habermann ([email protected]) Claudia Hemmelmann ([email protected]) Markus Kleemann ([email protected]) Elisabeth Oevervmann ([email protected]) Ralf Bouchard ([email protected]) Philipp Hildebrand ([email protected]) Thomas Jungluth ([email protected]) Conny Bürk (Conny.Buerk...

If ~q1, . . . , ~qm : Z → Z are polynomials with zero constant terms and E ⊂ Z has positive upper Banach density, then we show that the set E ∩ (E − ~q1(p− 1))∩ . . .∩(E−~qm(p−1)) is nonempty for some prime p. We also prove mean convergence for the associated averages along the prime numbers, conditional to analogous convergence results along the full integers. This generalizes earlier results ...

Ziegler-Nichols tuned PI and PID controllers are usually found to provide poor performances for high-order and nonlinear systems. In this study, an improved auto-tuning scheme is presented for Ziegler-Nichols tuned PI controllers (ZNPICs). With a view to improving the transient response, the proportional and integral gains of the proposed controller are continuously modified based on the curren...

A reply to Ziegler et al.

Ziegler D. Treatment of diabetic neuropathy and neuropathic pain: how far have we come? Diabetes Care 2008;31(Suppl. 2): S255–S261. DOI: 10.2337/dc08-s263 Two tables and the text of this article were first published in “Ziegler D. Treatment of Diabetic Polyneuropathy: Update 2006. Annals of the New York Academy of Sciences 1084:250–266, 2006.” This article is therefore considered a duplicate pu...

Several empirical methods for flood flow rate estimation have been presented. In this study,eight new empirical runoff estimation method including Dredge & Burge, Bourges, Inglis, Faning, Hyderabad, Burkli Ziegler, Cramar and Possenti were calculated in Bakhtegan watershed which is located in Fars province. After studying empirical methods for annual flood flow rate estimation and comparing the...