Heavy-Quark Hybrid Mass Splittings: Hyperfine and "Ultrafine"

It is argued that the heavy-quark limit of QCD requires a certain combination of hyperfine mass splittings in heavy-quark hybrid-meson multiplets to be unusually small. This observation will assist in the exploration of the heavy-quark hybrid spectrum at facilities such as PANDA. Alternatively, a large measured value for this mass splitting indicates that at least one member of the multiplet must contain significant light-quark degrees of freedom.Comment: Version to appear in Few-Body Systems. Substantial modifications from previous version, including extensive additional references and an expanded discussion of relevant operators. 7 page

Pulse rates recorded by digital film positioner

System converts detector pulse rates to photographs of binary scale indicator lights on continuously moving film. The system then scans the film and transfers the data to computer-compatible magnetic tape

The specificity and robustness of long-distance connections in weighted, interareal connectomes

Brain areas' functional repertoires are shaped by their incoming and outgoing structural connections. In empirically measured networks, most connections are short, reflecting spatial and energetic constraints. Nonetheless, a small number of connections span long distances, consistent with the notion that the functionality of these connections must outweigh their cost. While the precise function of these long-distance connections is not known, the leading hypothesis is that they act to reduce the topological distance between brain areas and facilitate efficient interareal communication. However, this hypothesis implies a non-specificity of long-distance connections that we contend is unlikely. Instead, we propose that long-distance connections serve to diversify brain areas' inputs and outputs, thereby promoting complex dynamics. Through analysis of five interareal network datasets, we show that long-distance connections play only minor roles in reducing average interareal topological distance. In contrast, areas' long-distance and short-range neighbors exhibit marked differences in their connectivity profiles, suggesting that long-distance connections enhance dissimilarity between regional inputs and outputs. Next, we show that -- in isolation -- areas' long-distance connectivity profiles exhibit non-random levels of similarity, suggesting that the communication pathways formed by long connections exhibit redundancies that may serve to promote robustness. Finally, we use a linearization of Wilson-Cowan dynamics to simulate the covariance structure of neural activity and show that in the absence of long-distance connections, a common measure of functional diversity decreases. Collectively, our findings suggest that long-distance connections are necessary for supporting diverse and complex brain dynamics.Comment: 18 pages, 8 figure

Trade Promotion Authority (TPA): Frequently Asked Questions

Legislation to reauthorize Trade Promotion Authority (“TPA”), sometimes called “fast track,” was introduced as the Bipartisan Congressional Trade Priorities and Accountability Act of 2015 (TPA- 2015; H.R. 1890/S. 995) on April 16, 2015. The legislation was reported by the Senate Finance Committee on April 22, 2015, and by the House Ways and Means Committee the next day. TPA, as incorporated into H.R. 1314 by substitute amendment, passed the Senate on May 22 by a vote of 62-37. In the House of Representatives, the measure was voted on under a procedure known as “division of the question,” which requires separate votes on each component, but approval of both to pass. Voting on June 12, TPA (Title I) passed by a vote of 219-211, but TAA (Title II) was defeated 126-302. A motion to reconsider that vote was laid by Speaker Boehner shortly after that vote. The previous grant of authority expired on July 1, 2007. TPA requires that if the President negotiates an international trade agreement that would reduce tariff or non-tariff barriers to trade in ways that require changes in U.S. law, the United States can implement the agreement only through the enactment of legislation. If the trade agreement and the process of negotiating it meet certain requirements, TPA allows Congress to consider the required implementing bill under expedited (“fast track”) procedures, pursuant to which the bill may come to the floor without action by the leadership, and can receive a guaranteed up-or-down vote with no amendments. Under TPA, an implementing bill may be eligible for this expedited consideration if (1) the trade agreement was negotiated during the limited time period for which TPA is in effect; (2) the agreement advances a series of U.S. trade negotiating objectives specified in the TPA statute; (3) the negotiations were conducted in conjunction with an extensive array of required notifications to and consultations with Congress and other stakeholders; and (4) the President submits to Congress a draft implementing bill, which must meet specific content requirements, and a range of required supporting information. If, in any given case, Congress judges that these requirements have not been met, TPA provides mechanisms through which the eligibility of the implementing bill for expedited consideration may be withdrawn in one or both chambers. The most recent previous renewal of TPA covered agreements reached between December 2002 and the end of June 2007. Current legislation would apply to agreements reached before July 1, 2018, with a possible extension to July 1, 2021. The United States is now engaged in several sets of trade agreement negotiations. Legislation to reauthorize TPA was introduced, but not considered, in the 113th Congress. The issue of TPA reauthorization raises a number of questions regarding TPA itself and the pending legislation. This report addresses a number of those questions that are frequently asked, including the following: What is trade promotion authority? Is TPA necessary? What are trade negotiating objectives and how are they reflected in TPA statutes? What requirements does Congress impose on the President under TPA? Does TPA affect congressional authority on trade policy

Mechanical properties of neat polymer matrix materials and their unidirectional carbon fiber-reinforced composites

The mechanical properties of two neat resin systems for use in carbon fiber epoxy composites were characterized. This included tensile and shear stiffness and strengths, coefficients of thermal and moisture expansion, and fracture toughness. Tests were conducted on specimens in the dry and moisture-saturated states, at temperatures of 23, 82 and 121 C. The neat resins tested were American Cyanamid 1806 and Union Carbide ERX-4901B(MPDA). Results were compared to previously tested neat resins. Four unidirectional carbon fiber reinforced composites were mechanically characterized. Axial and transverse tension and in-plane shear strengths and stiffness were measured, as well as transverse coefficients of thermal and moisture expansion. Tests were conducted on dry specimens only at 23 and 100 C. The materials tested were AS4/3502, AS6/5245-C, T300/BP907, and C6000/1806 unidirectional composites. Scanning electron microscopic examination of fracture surfaces was performed to permit the correlation of observed failure modes with the environmental test conditions