The analogy between gold and hydrogen is a subject of long‐standing debate. In the present work, we examine the validity of the gold‐hydrogen analogy in a series of small‐sized H‐doped gold clusters, Aun−1H with n varying between 2 and 10 and also investigate its dependence on the cluster size. Keeping in mind the importance of the role of structures, we make use of the genetic algorithm coupled with a density functional theory based method to exhaustively search and identify the energetically low‐lying structures of each of the H‐doped gold clusters. These lower energy structures of H‐doped and pristine gold clusters are then employed to carry out the calculations of their electronic properties, stability analysis as well as their reactivity towards the adsorption and activation of CO and O2 molecules. Our study shows that in line with the gold‐hydrogen analogy, both electronic properties and the adsorption/activation characteristics of H‐doped gold clusters remain very similar to those of pristine gold clusters.
Software Product Lines have emerged as a well-known approach for software reuse. Requirements of product line are organized into features in Feature Oriented Domain Analysis approach. Feature models are widely used to model the information gathered during domain analysis and it is not simply comprehensible to stakeholders. During the early stages of software development the interaction with stakeholders is mainly inconvenient. For this explanation, natural language (Language Extended Lexicon) is still widely used to model requirements information. It is in general understandable by stakeholders thus encouraging their participation but LEL does not provide design level of a system. To obtain design level of a system there is need to transform LEL symbols to UML class diagram as its elements are in abstract form representing blue print of a system. To achieve this transformation we describe in this paper a transformation process to derive a UML class diagram from natural language oriented requirement model, known as Language Extended.
“Surgery is like hunting, If you are going for a rabbit, Be prepared to face a tiger”
Placenta previa accreta, is a rare occurrence which occurs in 3 % of women diagnosed with placenta previa with massive
blood loss in almost every case resulting in cesarean hysterectomy. We report the case of central placenta previa with
accreta in a case with no cause known to precipitate it. With aggressive radical surgery, massive transfusion protocol,
well prepared to face it unexpectedly and vigilant postoperative management, such cases can be managed successfully.
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