Gradient-index (GRIN) microlenses (Fig. 1 inset) are important components for example in highresolution optical sensors, optical communication and in technical as well as in medical endoscopy [1, 2]. The ability of GRIN lenses to have plane optical surfaces offers great qualitative advantages in the mounting and miniaturisation of microoptical systems. Instead of the conventional spherical lens...

For this thesis, I refined and tested a computer-based engineering teaching tool called EDICS. EDICS (Engineering Design Instructional Computer Program) has proven to be a fun and intriguing means of conveying a wide variety of engineering design subjects to undergraduate students. The core audience of EDICS was assumed to be undergraduate engineering students who lacked the practical experienc...

Currently, many researchers pay attention to studying the influence of process variables on quality metal products after manufacture. The most common methods metalworking are forming processes, in which a high degree deformation, uneven plastic and elevated temperatures utilized. In cases manufacturing using these methods, self-balanced system residual stresses is formed that significantly affe...

As part of an ongoing investigation into real-world copying and drawing, I recorded the eye-hand drawing strategies of 16 subjects with drawing experiences ranging from expert to novice while they copied a line drawing of a standing nude. The experts produced accurate copies whereas all the beginners produced marked inaccuracies of overall scaling, proportion and shape. Analysis of eye and hand...

The proper visualization and monitoring of their (ongoing) business processes is crucial for any enterprise. Thus a broad spectrum of processes has to be visualized ranging from simple, short–running processes to complex long–running ones (consisting of up to hundreds of activities). In any case, users shall be able to quickly understand the logic behind a process and to get a quick overview of...

Given an uncountable regular cardinal κ, a partial order is κstationarily layered if the collection of regular suborders of P of cardinality less than κ is stationary in Pκ(P). We show that weak compactness can be characterized by this property of partial orders by proving that an uncountable regular cardinal κ is weakly compact if and only if every partial order satisfying the κ-chain conditio...