Carbon Offshoring: the Legal and Regulatory Framework for Coal Exports

This report examines the legal and regulatory framework for U.S. coal exports, focusing in particular on the significant improvements in railroad and port infrastructure that will be necessary in order to boost the volume of overseas coal shipments to the degree anticipated by recent industry projections. While existing railroads and ports have the capacity to handle current coal export volumes, much more infrastructure will be needed to meet surging foreign demand. A wide variety of new construction projects are under consideration to expand capacity and relieve congestion. These range from double-tracking existing Class I railroad rights of way to dredging harbors and installing a variety of new facilities to load, store, and ship coal from West Coast seaports. Because the phenomenon of large-scale U.S. coal exports is new, no comprehensive analysis has yet been undertaken to explore the federal, state and local laws applicable to each step in the process. It is our hope that this report will contribute to ongoing debates surrounding this important issue

Carbon Offshoring: the Legal and Regulatory Framework for Coal Exports

This report examines the legal and regulatory framework for U.S. coal exports, focusing in particular on the significant improvements in railroad and port infrastructure that will be necessary in order to boost the volume of overseas coal shipments to the degree anticipated by recent industry projections. While existing railroads and ports have the capacity to handle current coal export volumes, much more infrastructure will be needed to meet surging foreign demand. A wide variety of new construction projects are under consideration to expand capacity and relieve congestion. These range from double-tracking existing Class I railroad rights of way to dredging harbors and installing a variety of new facilities to load, store, and ship coal from West Coast seaports. Because the phenomenon of large-scale U.S. coal exports is new, no comprehensive analysis has yet been undertaken to explore the federal, state and local laws applicable to each step in the process. It is our hope that this report will contribute to ongoing debates surrounding this important issue

Quantifying the intra- and extravascular contributions to spin-echo fMRI at 3 T.

Functional MRI (fMRI) by means of spin-echo (SE) techniques provides an interesting alternative to gradient-echo methods because the contrast is based primarily on dynamic averaging associated with the blood oxygenation level-dependent (BOLD) effect. In this article the contributions from different brain compartments to BOLD signal changes in SE echo planar imaging (EPI) are investigated. To gain a better understanding of the underlying mechanisms that cause the fMRI contrast, two experiments are presented: First, the intravascular contribution is decomposed into two fractions with different regimes of flow by means of diffusion-weighting gradient schemes which are either flow-compensated, or will maximally dephase moving spins. Second, contributions from the intra- and extravascular space are selectively suppressed by combining flow-weighting with additional refocusing pulses. The results indicate two qualitatively different components of flowing blood which contribute to the BOLD contrast and a nearly equal share in functional signal from the intra- and extravascular compartments at TE approximately 80 ms and 3 T. Combining these results, there is evidence that at least one-half of the functional signal originates from the parenchyma in SE fMRI at 3 T. The authors suggest the use of flow-compensated diffusion weighting for SE fMRI to improve the sensitivity to the parenchyma