Preterm with appendicular abscess and subcapsular liver haematoma: an unreported association

Neonatal appendicitis is a rare yet serious condition. Known reported associations are Hirschsprung’s disease, necrotising enterocolitis (NEC) and cystic fibrosis. The occurrence of subcapsular liver haematoma in preterm neonates can be life threatening. We present an unreported association of these two serious conditions in a preterm infant with appendicular abscess and subcapsular liver haematoma. She presented with sepsis, enlarged liver and tender right iliac fossa mass. Laparotomy was performed for possible complicated NEC. Intraoperatively, there was an appendicular abscess with a small subcapsular liver haematoma and no evidence of NEC. Appendectomy and peritoneal toilet were performed. She had a stormy postoperative period due to sepsis, thrombocytopaenia and expansion of her liver haematoma. The pathology of her appendix was in keeping with appendicitis, with no evidence of NEC. Her liver haematoma gradually resolved. Suction rectal biopsy showed normal ganglia. She was discharged after 7 weeks and remained well since then.Keywords: hematoma, liver, neonatal appendicitis, preterm, subcapsula

A3_4 Jumping Into Orbit

The possibility of something (or someone) jumping from a moon or planet, directly into orbital motion, using only the initial thrust from the jump, is investigated. A physical model is created using IDL to plot paths of motion from a jump in order to do so. It was found that it is impossible to complete a full orbit of any body in space without landing or escaping gravitational pull

A3_8 The Wings of Pegasus

In this article a physical model is created to ascertain the size of the wings of the mythological flying horse Pegasus. Due to the nature of the physics involved, it was found that many assumptions had to be made that left some doubt for the quality of the final calculations. A minimum surface area of 7.9m2 was calculated.

A3_5 Falling into Straw

The video game “Assassin’s Creed” often depicts and encourages the player to leap off tall build-ings into bales of straw/hay. This article looks into whether this is survivable, and finds the maximum height to which the depicted hay bales are safe to jump into to be about a 12-13m fall, and the max survivable fall height to be about 50m

A3_1 LED Refrigerator

This paper investigates the practicality of using LEDs with an efficiency of 230% as a way of cooling air inside a refrigerator. Using the standard dimensions of a household refrigerator and surrounding the entire surface area with the LEDs, how long would it take to reduce the temperature from 20°C room temperature to 5°C. We found that it would take 14.7 hours

A3_6 Pandora’s Floating Mountains: Rotational Momentum

This report follows a previous article [1], which looked into the physics of how to cause a mountain to float as depicted in the James Cameron movie “Avatar”. This article seeks to prove this is possible through the centrifugal force generated by the rotation of a planet. It was discovered that the necessary period of rotation, if that planet were Earth, was 13.4 minutes

A3_2 Sucking the sea dry

This paper discusses the possibility of removing water from the earth into space using only capillary action. The paper finds that a capillary of radius 2.332x10^-10 would be required meaning that though theoretically possible not realistically plausible to create

A3_3 Pandoras Floating mountains

The mountains in the film Avatar are shown to naturally float in the air unaided by mechanical flight, this paper discuses whether this phenomenon could be created by the mountains containing superconducting materials and floating on the planets earth like magnetic field. The results show that a much larger field would be needed to float any material of a substantial size so the effect is not caused by this method

A3_7 Pandora’s Floating Mountains: Lagrange Point

This article investigates the physical possibility of the floating mountains depicted in the film “Avatar”. It was theorised that should the L1 Lagrange point between the moon the movie was based on, and the gas giant it is shown to orbit lie on the surface of the planet, then any matter at that point should float. It was found that the planet would have to orbit very closely to the gas giant, within 0.6247 planetary radii of the surface, and would therefore be unfeasible in the manner depicted in the movie due to the natural disasters this would incur

Modeling and Reasoning over Distributed Systems using Aspect-Oriented Graph Grammars

Aspect-orientation is a relatively new paradigm that introduces abstractions to modularize the implementation of system-wide policies. It is based on a composition operation, called aspect weaving, that implicitly modifies a base system by performing related changes within the system modules. Aspect-oriented graph grammars (AOGG) extend the classic graph grammar formalism by defining aspects as sets of rule-based modifications over a base graph grammar. Despite the advantages of aspect-oriented concepts regarding modularity, the implicit nature of the aspect weaving operation may also introduce issues when reasoning about the system behavior. Since in AOGGs aspect weaving is characterized by means of rule-based rewriting, we can overcome these problems by using known analysis techniques from the graph transformation literature to study aspect composition. In this paper, we present a case study of a distributed client-server system with global policies, modeled as an aspect-oriented graph grammar, and discuss how to use the AGG tool to identify potential conflicts in aspect weaving