Chemical characterization of ancient pottery from sudan by x‐ray fluorescence spectrometry (xrf), electron microprobe analyses (empa) and inductively coupled plasma mass spectrometry (ICP–MS)*

Sixty‐four sherds and seven natural clays from prehistoric sites in northwestern Sudan have been submitted to petrological and chemical analysis using XRF spectrometry, EMPA and ICP–MS. According to their texture, the sherds form five different groups. The high contents of P₂O₅ (more than 0.5 wt%) discerned in 19 samples and the variation of the P₂O₅ content in two samples of the same vessel can be explained by post‐depositional processes or by the ancient organic contents (e.g., milk) of the vessel. Chemical classification of the pottery bulk suggests that vessels were made locally, as only sherds from the same area show homogeneity of data.     

PIGMENT IDENTIFICATION IN GREEK POTTERY BY RAMAN MICROSPECTROSCOPY*

Raman microspectroscopy (RMS) is now established as a key technique for the identification of pigments of archaeological pottery that permits the in situ study of art objects by a non‐destructive procedure. The information obtained represents a great aid to restoration and conservation techniques. In this work, the chemical nature of the red, black and white pigments of five samples of Greek pottery from the end of the fifth century and the first half of the fourth century bc , exhumed from the Iberian necropolis of Cabezo Lucero (Guardamar del Segura, Alicante, Spain), has been identified. The black and the red pigments are found to be magnetite (Fe₃O₄) and hematite (α‐Fe₂O₃), respectively. The white pigment is found, for the first time, to be composed of alumina (α‐Al₂O₃ and γ‐Al₂O₃) probably yielded by the thermal decomposition of Greek bauxite.     

Policy Implementation and the Environmental Protection Agency: What Factors Influence Remediation at Superfund Sites?

Since the early 1990s, the Environmental Protection Agency (EPA) has struggled to make Superfund, the program that addresses the nation's worst hazardous waste sites, "faster, fairer, and more efficient." Indeed, agency figures reflect substantial changes in recent years. Since 1993, over 500 Superfund sites have reached the "construction completion" stage in remediation. Comparatively, in the program's first 13 years, only 156 sites reached construction completion. This article explores why some Superfund sites are more likely to be remediated than others. We use survival analysis to empirically test three theoretical models of Superfund remedial progress: (1) Administrative Convenience/Transaction Costs; (2) Problem Severity; and (3) Political Pressure models. The results indicate that the EPA is more likely to tackle "easier" or low-risk sites within the program, community involvement in Superfund is associated with decreased remedial progress, and remedial action is more likely to occur when political oversight is present.     

Welfare Reform and Economic and Housing Capacity for Low-Income Households, 1997–1999

The 1996 Personal Responsibility and Work Opportunity Reconciliation Act (PRWORA) marked the continued devolution of social policy to state and local government in addition to restructuring an ailing welfare system. Despite concerns that welfare recipients would find greater obstacles to economic stability as a result, declining welfare rolls have been accompanied by declining poverty rates over the past seven years. An important question is whether low‐income families have gained greater employment and housing capacity following welfare reform. Moreover, does capacity vary across states with different welfare policies? In addition, do families face greater economic vulnerability with respect to food scarcity and health care? This article uses the data from the 1997 and 1999 waves of the National Survey of America's Families to systematically assess differences in capacity and vulnerability among lower income families across different policy regimes. Using two measures of capacity for housing and employment, and quality of life, findings suggest that more stringent welfare rules are related to greater job and housing attainment but a reduced quality of life.