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Full-Text Articles in Physical Sciences and Mathematics

Synthesis And Hydration Of Alite-Calcium Sulfoaluminate Cement, Natechanok Chitvoranund, Frank Winnefeld, Craig Hargis, Barbara Lothenbach Feb 2017

Synthesis And Hydration Of Alite-Calcium Sulfoaluminate Cement, Natechanok Chitvoranund, Frank Winnefeld, Craig Hargis, Barbara Lothenbach

Craig Hargis

An alite-calcium sulfoaluminate (ACSA) clinker containing approximately 50% alite and 10% ye'elimite was synthesised at 1300°C using a laboratory furnace and 1% calcium fluoride (CaF2) as a mineraliser, ground and blended with 5% anhydrite. The hydration mechanism of the resulting ACSA cement was investigated experimentally using quantitative X-ray diffraction and thermogravimetry, as well as by thermodynamic modelling. During the first hours, mainly alite reacts. Ye'elimite starts to dissolve significantly after 2 d, as it is predominately present as inclusions within the alite matrix and thus reacts only after sufficient alite has dissolved to expose the ye'elimite domains within …


Pathway Variation Analysis (Pva): Modelling And Simulations, Nagesh Shukla, Sudi Lahiri, Darek Ceglarek Nov 2015

Pathway Variation Analysis (Pva): Modelling And Simulations, Nagesh Shukla, Sudi Lahiri, Darek Ceglarek

Nagesh Shukla

Maintaining a care pathway within a hospital to provide complex care to patients is associated with challenges related to variations from the pathway. This occurs due to ineffective decision-making processes, unclear process steps, the interactions, conflicting performance measures for speciality units, and the availability of resources. These variations from the care pathway or standard care delivery processes lead to longer patient waiting times and lower patient throughput. Traditional approaches to improve the pathway focus primarily on reducing variations within the care pathway such as bottlenecks or throughput within the pathway rather than examining variations from the care pathway. In this …


A Semi-Deterministic Approach For Modelling Of Urban Travel Demand, Nam N. Huynh, Nagesh Shukla, Albert Munoz Aneiros, Vu Lam Cao, Pascal Perez Apr 2015

A Semi-Deterministic Approach For Modelling Of Urban Travel Demand, Nam N. Huynh, Nagesh Shukla, Albert Munoz Aneiros, Vu Lam Cao, Pascal Perez

Nagesh Shukla

This paper presents a methodology to construct travel related activity schedules for individuals in a synthetic population. The resulting list of activity schedules are designed as an input into a micro-simulator for urban transport dynamics analysis. The methodology involves two main steps. The first step generates a synthetic population based on census data sourced from the Australian Bureau of Statistics (ABS). The second step assigns individuals in the synthetic population activity schedules using Household Travel Survey (HTS) data related to the geographical area of interest (in this case, the Sydney Greater Metropolitan area). Each individual is assigned an ordered set …


Atollgame: A Companion Modelling Experience In The Pacific, A Dray, Pascal Perez, Christophe Le Page, Patrick D'Aquino, Ian White Nov 2012

Atollgame: A Companion Modelling Experience In The Pacific, A Dray, Pascal Perez, Christophe Le Page, Patrick D'Aquino, Ian White

Professor Pascal Perez

Multi-Agent Systems (MAS) have been developed to study the interaction between societies and the environment. Here we use MAS in conjunction with a Companion Modelling (ComMod) approach to develop a Negotiation Support System for groundwater management in Tarawa, Republic of Kiribati. In agreement with the complex and dynamic nature of the processes under study, the ComMod approach requires a permanent and iterative confrontation between theories and field circumstances. Therefore, it is based on repetitive back and forth steps between the model and the field situation. The methodology applied in Tarawa relies on 3 successive stages. First, a Global Targeted Appraisal …


Towards An Art And Science Of Decision Aiding For Water Management And Planning: A Participatory Modelling Process, Katherine A. Daniell, Ian White, Nils Ferrand, Alexis Tsoukias, Stewart Burn, Pascal Perez Nov 2012

Towards An Art And Science Of Decision Aiding For Water Management And Planning: A Participatory Modelling Process, Katherine A. Daniell, Ian White, Nils Ferrand, Alexis Tsoukias, Stewart Burn, Pascal Perez

Professor Pascal Perez

Planning and management of water resources are faced with increasingly high levels of complexity, uncertainty and conflict. Traditional technical and top-down management strategies have proved inadequate, forcing a move to more "integrated" forms of management, planning and decision making that can include stakeholders and communities, as well as technical experts and policy makers. These integrated forms of management require not only good technical or scientific ability, but a range of "art-like" skills including communication, creativity and the capacity to acknowledge and integrate diverse points of view. However, processes designed to aid such inter-organisational or multi-stakeholder decisionmaking are rare and in …