Phase Behavior of Aqueous Na-K-Mg-Ca-CI-NO3 Mixtures: Isopiestic Measurements and Thermodynamic Modeling

A comprehensive model has been established for calculating thermodynamic properties of multicomponent aqueous systems containing the Na{sup +}, K{sup +}, Mg{sup 2+}, Ca{sup 2+}, Cl{sup -}, and NO{sub 3}{sup -} ions. The thermodynamic framework is based on a previously developed model for mixed-solvent electrolyte solutions. The framework has been designed to reproduce the properties of salt solutions at temperatures ranging from the freezing point to 300 C and concentrations ranging from infinite dilution to the fused salt limit. The model has been parameterized using a combination of an extensive literature database and new isopiestic measurements for thirteen salt mixtures at 140 C. The measurements have been performed using Oak Ridge National Laboratory's (ORNL) previously designed gravimetric isopiestic apparatus, which makes it possible to detect solid phase precipitation. Water activities are reported for mixtures with a fixed ratio of salts as a function of the total apparent salt mole fraction. The isopiestic measurements reported here simultaneously reflect two fundamental properties of the system, i.e., the activity of water as a function of solution concentration and the occurrence of solid-liquid transitions. The thermodynamic model accurately reproduces the new isopiestic data as well as literature data for binary, ternary and higher-order subsystems. Because of its high accuracy in calculating vapor-liquid and solid-liquid equilibria, the model is suitable for studying deliquescence behavior of multicomponent salt systems

Nondestructive defect characterization of saw-damage-etched multicrystalline silicon wafers using scanning electron acoustic microscopy

10.1109/JPHOTOV.2012.2218579IEEE Journal of Photovoltaics31370-37

Integrated (automated) photon emission microscope and MOSFET characterization system for combined microscopic and macroscopic device analysis

Proceedings of the International Symposium on the Physical and Failure Analysis of Integrated Circuits, IPFA113-1180023

Government policies and household mobility behaviour in Singapore

10.1080/0042098032000146821Urban Studies40132643-266

The dynamics of the Singapore private housing market

10.1080/0042098042000178708Urban Studies413605-61

Characterizing Roman Artifacts to Investigate Gendered Practices in Contexts Without Sexed Bodies

This article concerns the characterization of Roman artifacts so that they can play a greater role in gendered approaches to Roman sites—sites that constitute lived spaces but lack actual references to sexed bodies. It commences with a brief discussion on gendered approaches in the two main strands of Roman archaeology—classical and provincial. Within the differing frameworks of the wider disciplines of classics and archaeology, both strands focus on contexts with sexed bodies—burials, figurative representation, and inscriptions. The discussion serves as a background for more integrated and more interrogative approaches to relationships between Roman artifacts and gendered practices, approaches that aim to develop interpretative tools for investigating social practice in contexts where no representational or biologically sexed bodies are evident. Three types of artifacts—brooches, glass bottles, and needles—are used to demonstrate how differing degrees of gender associations of artifacts and artifact assemblages can provide insights into gender relationships in settlement contexts. These insights in turn contribute to better understandings of gendered sociospatial practices across the Roman world