Fabrication of alumina ceramics from powders made by sol–gel type hydrolysis in microemulsions

The engineering aspects of the preparation of nanostructured alumina ceramic precursors by alcoholate hydrolysis using microemulsions as reaction media are investigated here. The precipitate was subjected to several treatment steps. Although the properties of the primary precipitated powders are independent of the chemical or reaction engineering parameters of the precipitation procedure, the structure of treated powders and sintered, dense ceramics strongly depends on thermal and mechanical handling like crystallization or grinding of the alumina ceramic precursor. Strong differences are manifested in relative densities and sintering kinetics and can be observed by SEM analysis.     

Man or Boy? Probleme der Rekursion in Compilern

Eingegangen am 20.03.1996, in überarbeiteter Form am 17.02.1997     

The role of control motivation in mortality salience effects on ingroup support and defense.

Terror management research has shown that mortality salience (MS) leads to increased support and defense of cultural ingroups and their norms (i.e., worldview defense, WD). The authors investigated whether these effects can be understood as efforts to restore a generalized sense of control by strengthening one's social ingroup. In Studies 1-3, the authors found that WD was only increased following pure death salience, compared with both dental pain salience and salience of self-determined death. As both the pure death and the self-determined death conditions increased accessibility of death-related thoughts (Study 4), these results do not emerge because only the pure death induction makes death salient. At the same time, Study 5 showed that implicitly measured control motivation was increased in the pure death salience condition but not under salience of both self-determined death and dental pain. Finally, in Study 6, the authors manipulated MS and control salience (CS) independently and found a main effect for CS but not for MS on WD. The results are discussed with regard to a group-based control restoration account of terror management findings. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

On Topological Equivalence of Linear Lows with Applications to Bilinear Control Systems

This paper classifies continuous linear flows using concepts and techniques from topological dynamics. Specifically, the concepts of equivalence and conjugacy are adapted to flows on vector bundles, and the Lyapunov decomposition is characterized using the induced flows on the Grassmann and the flag bundles. These results are then applied to bilinear control systems, for which their behavior in , on the projective space , and on the Grassmannians is characterized. This research was partially supported by Proyecto FONDECYT No. 1060981 and Proyecto FONDECYT de Incentivo a la Cooperación Internacional No. 7020439.     

The instance theory of automaticity: Why the Weibull?

It is shown that in order to derive the Weibull shape for the response time distribution in the instance theory of automaticity (G. D. Logan, 1988) by an asymptotic argument from the theory of extreme value statistics, it is necessary to determine the domain of attraction of the underlying parent distribution. An alternative, nonasymptotic characterization property equivalent to the power law of practice is presented here that gives a more feasible justification for the choice of the Weibull. This result leads to a different emphasis on the empirical conditions testing the theory. Some problems arising from the use of the asymptotic theory of extreme value statistics for the stochastic modeling of behavioral data are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Temporal logic for process specification and recognition

Acting intelligently in dynamic environments involves anticipating surrounding processes, for example to foresee a dangerous situation by recognizing a process and inferring respective safety zones. Process recognition is thus key to mastering dynamic environments including surveillance tasks. In this paper, we are concerned with a logic-based approach to process specification, recognition, and interpretation. We demonstrate that linear temporal logic (LTL) provides the formal grounds on which processes can be specified. Recognition can then be approached as a model checking problem. The key feature of this logic-based approach is its seamless integration with logic inference which can sensibly supplement the incomplete observations of the robot. Furthermore, logic allows us to query for process occurrences in a flexible manner and it does not rely on training data. We present a case study with a robotic observer in a warehouse logistics scenario. Our experimental evaluation demonstrates that LTL provides an adequate basis for process recognition.     

A note on the stop-signal paradigm, or how to observe the unobservable.

A new theoretical analysis of the stop-signal paradigm is proposed. With the concepts of crude and net hazard functions, the nonobservable control-latency distribution can be estimated from observable reaction times. This result allows a test of Logan & Cowan's (1984) model without any simplifying assumptions. (PsycINFO Database Record (c) 2010 APA, all rights reserved)