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Self-assembly, ordered nanostructures and functionality of polyelectrolyte-amphiphile complexes
(2000)
Polymers at membranes
(2000)
The surface of biological cells consists of a lipid membrane and a large amount of various proteins and polymers, which are embedded in the membrane or attached to it. We investigate how membranes are influenced by polymers, which are anchored to the membrane by one end. The entropic pressure exerted by the polymer induces a curvature, which bends the membrane away from the polymer. The resulting membrane shape profile is a cone in the vicinity of the anchor segment and a catenoid far away from it. The perturbative calculations are confirmed by Monte-Carlo simulations. An additional attractive interaction between polymer and membrane reduces the entropically induced curvature. In the limit of strong adsorption, the polymer is localized directly on the membrane surface and does not induce any pressure, i.e. the membrane curvature vanishes. If the polymer is not anchored directly on the membrane surface, but in a non-vanishing anchoring distance, the membrane bends towards the polymer for strong adsorption. In the last part of the thesis, we study membranes under the influence of non-anchored polymers in solution. In the limit of pure steric interactions between the membrane and free polymers, the membrane curves towards the polymers (in contrast to the case of anchored polymers). In the limit of strong adsorption the membrane bends away from the polymers.
The objective of this thesis is to provide new space compaction techniques for testing or concurrent checking of digital circuits. In particular, the work focuses on the design of space compactors that achieve high compaction ratio and minimal loss of testability of the circuits. In the first part, the compactors are designed for combinational circuits based on the knowledge of the circuit structure. Several algorithms for analyzing circuit structures are introduced and discussed for the first time. The complexity of each design procedure is linear with respect to the number of gates of the circuit. Thus, the procedures are applicable to large circuits. In the second part, the first structural approach for output compaction for sequential circuits is introduced. Essentially, it enhances the first part. For the approach introduced in the third part it is assumed that the structure of the circuit and the underlying fault model are unknown. The space compaction approach requires only the knowledge of the fault-free test responses for a precomputed test set. The proposed compactor design guarantees zero-aliasing with respect to the precomputed test set.
Oftmals bescheinigt das Bundesverfassungsgericht den Fachgerichten objektive Willkür. Die vorliegende Untersuchung zeichnet die Herleitung dieses Topos aus Art. 3 Abs. 1 Grundgesetz nach. Die vom Bundesverfassungsgericht entschiedenen Urteilsverfassungsbeschwerden werden systematisiert und ausgewertet. Dabei wird deutlich, daß das Kriterium der objektiven Willkür in verschiedenen Bereichen recht unterschiedlich gehandhabt wird. Nach einem Abriß über das Verhältnis von Verfassungsgerichtsbarkeit und Fachgerichtsbarkeit setzt sich die Untersuchung mit den Zielen der Rechtsprechung zur objektiven Willkür auseinander. Der Dienst an der Gerechtigkeit wird durch ein gerechtes Verfahren, aus Sicht des Bundesverfassungsgerichts vor allem aber durch ein gerechtes Ergebnis im Einzelfall geleistet. Der Autor prüft nach, ob tatsächlich Defizite bestehen und ob das Bundesverfassungsgericht sie behebt.