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

POLICY FOR THE'DESERVING,'BUT POLITICALLY WEAK: THE 1996 WELFARE REFORM ACT AND BATTERED WOMEN

The Personal Responsibility and Work Opportunity Reconciliation Act of 1996 (Public Law #104-193) is perhaps the most visible national legislation since the sweeping Civil Rights laws of the 1960s. For social policy so well entrenched into the American social fabric, the rapidity with which reforms swept through the welfare system was unprecedented and confound conventional theoretical pronouncements on bureaucracy and policy change. The swiftness of reform, and the political rhetoric that surrounded the 1996 Welfare Reform Act, have prompted criticism that reformers responded more to the social construction of welfare recipients than they did to the dictates of sound public policy (Magusson and Dunham, 1996). This article discusses the ramifications of the 1996 Welfare Reform Act for battered women and concludes that battered women's social construction as deserving of public assistance, but politically weak, precipitated welfare reform policy, targeted to battered women, that has been largely rhetorical rather than substantive. Copyright 2001 by The Policy Studies Organization.