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Modeling and optimization of complex systems traditionally have required significant programming efforts in order to encode the model dynamics, the cost functions and the constraints in a format suitable for state of the art numerical algorithms. The availability of dedicated languages for physical modeling has made the design process simpler, but often tools have been limited to a particular opti

Different applications of high power ultrasound in industry and medical applications are based on the propagation and collapse of acoustic cavitation bubbles. This paper presents an enhanced numerical model and simulated results of formation and collapse of a single bubble in a liquid for two cases: bubble with uniform pressure and a bubble with variable pressure inside. For the two cases, both he

We analyse the effects of soil type on mortality of children aged 2-15 living in five rural parishes in Sweden between 1850 and 1914. We use micro-level longitudinal demographic data combined with micro-level longitudinal geographic data. Here, the individuals in the parishes are linked to the property units they lived in. We find that, compared to those living in property units covered by 80-100%

This paper presents an efficient numerical method for designing PI controllers. The design is based on optimization of load disturbance rejection with constraints on sensitivity and weighting of set point response. Thus, the formulation of the design problem captures three essential aspects of industrial control problems, leading to a non-convex optimization problem. Efficient ways to solve the pr

The aim of this study is to develop better understanding of the relationship between microclimate and urban design in the hot dry city of Damascus. This is done by studying the impact of urban regulations on microclimate in different urban design patterns in modern Damascus. This study also investigates the behaviour of different thermal comfort indices to define the thermal comfort and acceptabil

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Missionary work in the Americas

The colophon in Ps 72:20 has long been puzzling psalm scholars. It reads כלו תפלות דוד בן־ישי—the prayers of David, son of Jesse, are ended—and as such it raises a number of questions. The first observation to be made is that the word תפלה is used, not תהלה. That this is a potential problem is clear already in the LXX, where תפלה is corrected to ὕμνοι. Secondly, the claim that the prayers of David

A reformulation of the dual control problem makes it possible to interpret and understand the nature of different approximations to dual control, in particular the Adaptive Predictive Controller (APC) and the Active Suboptimal Dual Controller (ASOD). The analysis makes the origin of the computational problems more clear, and suggests new alternatives for approximations.