Folgende Arbeit beschäftigt sich mit dem Ising-Modell in drei Dimensionen auf einem {Gitter} mit einer langreichweitigen, potenzförmig korrelierten ($\propto \dist^{-\aexp}$) Unordnung mithilfe von Monte Carlo Simulationstechniken. Der Hauptteil der Arbeit ist die Bestimmung der {kritischen} Exponenten des Ising-Modells in Abhängigkeit von der Korrelationsstärke $\aexp$. Dies wird durch die Anwendung der Finite-Size-Scaling Analyse und der Temperatur-Scaling Analyse umgesetzt. Dabei wird insbesondere die Vorhersage von Weinrib und Halperin ($ν = 2 / \aexp$) überprüft. Weiterführend, werden die kritischen Temperaturen in Abhängigkeit vom Korrelationsexponenten $\aexp$ und der Defektkonzentration ermittelt und die Hyperscaling-Relation studiert. Ergänzend werden vielfältige Aspekte, wie die Autokorrelation der Observablen, die Anwendung der Histogram-Reweighting-Methode und Messung der Korrelationsstärken $\aexp$ auf Gittern erläutert. / In this thesis the three-dimensional Ising model on a lattice with long-range power-law correlated (${\propto \dist^{-\aexp}}$) site disorder is studied with the help of Monte Carlo simulation techniques. The key part of the work is the estimation of the critical exponents of the Ising model in dependence of the correlation strength $\aexp$. This is done by applying finite-size scaling analysis and the temperature scaling analysis. In particular, the conjecture by Weinrib and Halperin ($ν = 2 / \aexp$) is reviewed. Additionally, the critical temperatures in dependence of the correlation exponent $\aexp$ and the concentration of defects are provided and the hyperscaling relation is checked. Supplementary, various aspects such as autocorrelation times of the observables, applicability of the histogram reweighting technique and the measured correlation exponents $\aexp$ on the lattices are provided.

It is well established that modern directional microphones in hearing aids provide listeners with an improved speech understanding in noise. De-spite this, the impact of directional microphones in real life conditions is limited. In fact, hearing in noise remains one of the biggest problems for hearing aid users. Fortunately, recent developments in super-directional technology, at least in laboratory settings, promise to deliver significant benefits to hearing aid users. Experiments suggest large improvements in speech understanding in noise and significant preference for highly directional systems. This advantage is often extrapolated to suggest equal advantages in real world listening situations. However, it is increasingly apparent that hearing in noise entails various complex tasks for the listener. Consequently, super-directional technology may be advantageous in some situations but may also have some limitations in its usage. Here we present a discussion of super-directional microphone technology based on several studies. In our research we have examined various factors that influence benefit such as beam width design, adaptation speed, preservation of spatial cues, vent sizes, acoustic scene, and reverberation. Our evidence appears to be confounded by individual characteristics of the listener such as age, hearing loss, personality traits, and cognition. All these factors combined will guide our discussions and thoughts about future research and development of super-directional systems

Abstract The purpose of this research was to investigate the effects of virtual reality training on the development of cognitive memory and handgun accuracy by law enforcement neophytes. One hundred and six academy students from 6 different academy classes were divided into two groups, experimental and control. The experimental group was exposed to virtual reality training for a period of 8 hours. The control group was exposed to the traditional, non-interactive training that occurred on a gun range, also for a period of 8 hours. After exposing the groups to their respective training, a counter-balance technique was utilized to expose both groups to a series of 3 law enforcement related scenarios. The time and number of shots that each participant used to cognitively process and solve the scenarios were collected and analyzed by group and gender. There was a significant difference, by group, in both time and accuracy, with the virtual reality group using less time and posting more accurate scores. Mean accuracy scores indicated that the males participants were more accurate in their response to the scenario administration.