Boston College

About: Boston College is a education organization based out in Boston, Massachusetts, United States. It is known for research contribution in the topics: Population & Poison control. The organization has 9749 authors who have published 25406 publications receiving 1105145 citations. The organization is also known as: BC.

Length dependence of carbon nanotube thermal conductivity and the "problem of long waves".

Abstract: We present the first calculations of finite length carbon nanotube thermal conductivity that extend from the ballistic to the diffusive regime, throughout a very wide range of lengths and temperatures. The long standing problem of vanishing scattering of the "long wavelength phonf dramatically here, making the thermal conductivity diverge as the nanotube length increases. We show that the divergence disappears if 3-phonon scattering processes are considered to second or higher order. Nevertheless, for defect free nanotubes, the thermal conductivity keeps increasing up to very large lengths (10 gm at 300 K). Defects in the nanotube are also able to remove the long wavelength divergence.

Chapter 5 Empirical evidence on income inequality in industrialized countries

Abstract: This chapter reviews the evidence on cross-national comparisons of annual disposable income inequality in over 20 wealthy nations. We begin by reviewing a number of conceptual and measurement issues which must be addressed by any cross-national comparison of survey-based household income data. With these caveats in mind, we present data on both the level of inequality during the early to mid-1990s, and in inequality trends since 1970. While most comparisons are made in terms of relative incomes within nations, we also make some real income comparisons at a point in time using purchasing power parities. The data indicate that a wide range of inequality exists across these rich nations during this decade, with the most unequal nation experiencing a level of inequality which is more than twice the level found in the most equal nation. Country specific trends in income inequality are more similar, although not universally so. The large majority of nations have experienced rising income inequality over the last decade or longer. This increase is not offset by changes in income mobility over this period, and follows a period of declining income inequality in most of these same nations.

Superplastic carbon nanotubes

Abstract: Conditions have been discovered that allow extensive deformation of rigid single-walled nanotubes.

Interface engineering of quantum Hall effects in digital transition metal oxide heterostructures

Abstract: Topological insulators are a class of materials with an unusual band structure that makes them metallic at the surface and insulating in the bulk. Okamoto and co-workers use electronic structure calculations to predict a new family of possible topological insulators based on transition-metal oxides.

Growth of p-type hematite by atomic layer deposition and its utilization for improved solar water splitting.

Abstract: Mg-doped hematite (α-Fe2O3) was synthesized by atomic layer deposition (ALD). The resulting material was identified as p-type with a hole concentration of ca. 1.7 × 1015 cm–3. When grown on n-type hematite, the p-type layer was found to create a built-in field that could be used to assist photoelectrochemical water splitting reactions. A nominal 200 mV turn-on voltage shift toward the cathodic direction was measured, which is comparable to what has been measured using water oxidation catalysts. This result suggests that it is possible to achieve desired energetics for solar water splitting directly on metal oxides through advanced material preparations. Similar approaches may be used to mitigate problems caused by energy mismatch between water redox potentials and the band edges of hematite and many other low-cost metal oxides, enabling practical solar water splitting as a means for solar energy storage.