THE ECONOMICS OF CLEANING WINTER WHEAT FOR EXPORT: AN EVALUATION OF PROPOSED FEDERAL "CLEAN GRAIN" STANDARDS

Buyer complaints about poor quality U.S. wheat have led to proposals to enforce minimum dockage standards for exports. An economic-engineering approach is used to evaluate costs and benefits of cleaning wheat in order to meet these standards for 13 possible cleaning configurations. These results are used in an optimization framework to estimate costs and benefits of cleaning all U.S. export wheat. The estimates indicate that cleaning U.S. export winter wheat to .35% dockage would cost an average of 1 cent/bu., requiring an initial capital investment of $28 million. Value of wheat lost in cleaning is a significant cost that previously has been overlooked.Agricultural and Food Policy,

Chern-Simons action for zero-mode supporting gauge fields in three dimensions

Recent results on zero modes of the Abelian Dirac operator in three dimensions support to some degree the conjecture that the Chern-Simons action admits only certain quantized values for gauge fields that lead to zero modes of the corresponding Dirac operator. Here we show that this conjecture is wrong by constructing an explicit counter-example.Comment: version as published in PRD, minor change

Multi-lepton Signatures of a Hidden Sector in Rare B Decays

We explore the sensitivity of flavour changing b -> s transitions to a (sub-)GeV hidden sector with generic couplings to the Standard Model through the Higgs, vector and axion portals. The underlying two-body decays of B mesons, B -> X_s S and B0 -> SS, where S denotes a generic new GeV-scale particle, may significantly enhance the yield of monochromatic lepton pairs in the final state via prompt decays of S to a dilepton pair. Existing measurements of the charged lepton spectrum in neutral-current semileptonic B decays provide bounds on the parameters of the light sector that are significantly more stringent than the requirements of naturalness. New search modes, such as B -> X_s + n(l+l-) and B0 -> n(l+l-) with n > 1 can provide additional sensitivity to scenarios in which both the Higgs and vector portals are active, and are accessible to (super-)B factories and hadron colliders.Comment: 12 pages, 2 figures; v2: reference added, minor correction

Cerebellar-dependent delay eyeblink conditioning in adolescents with Specific Language Impairment

This is the published version, also available here: http://dx.doi.org/10.1007/s11689-010-9058-z.Cerebellar impairments have been hypothesized as part of the pathogenesis of Specific Language Impairment (SLI), although direct evidence of cerebellar involvement is sparse. Eyeblink Conditioning (EBC) is a learning task with well documented cerebellar pathways. This is the first study of EBC in affected adolescents and controls. 16 adolescent controls, 15 adolescents with SLI, and 12 adult controls participated in a delay EBC task. Affected children had low general language performance, grammatical deficits but no speech impairments. The affected group did not differ from the control adolescent or control adult group, showing intact cerebellar functioning on the EBC task. This study did not support cerebellar impairment at the level of basic learning pathways as part of the pathogenesis of SLI. Outcomes do not rule out cerebellar influences on speech impairment, or possible other forms of cerebellar functioning as contributing to SLI

The Shareholder Wealth Effects of Delaware Litigation

We collect data on the record of every action in over one thousand cases involving public companies from 2004 to 2011 in the Delaware Court of Chancery, which is the leading court for corporate law disputes in the United States. We use these data to estimate how markets respond to Delaware litigation events and characteristics such as case initiations, procedural motions, case quality, and judge identity. We find that negative abnormal returns are associated with the filing of derivative and contract cases, but we observe little effect associated with the filing of the average merger challenge. When we include measures of case quality, we see that higher quality cases increase the expected impact of derivative and contract litigation on firm value. We also develop evidence that tactics associated with multijurisdictional litigation are associated with a weakened impact of litigation on firm value. This evidence is consistent with the belief that the presence of litigation in another jurisdiction allows defense lawyers to bid down competing groups of plaintiffs’ lawyers during settlement negotiations. Finally, we show that abnormal returns are not associated with information on judicial assignment at the time of case filing, nor are they associated with judge identity at case resolution. These results suggest that the judicial impact on shareholder wealth at the time of judicial assignment and the time of case termination is too small to be statistically detected

Pre-Pandemic Ethics: Triage and Discrimination

UK COVID-19 death rates are disproportionately high among Black African, Black Caribbean, Bangladeshi, Pakistani, and Indian people in the UK, as well as among care home residents, carers, essential workers, and people living with disabilities and pre-existing conditions. The effects of the pandemic demonstrate the systemic social disparities of life and death in the UK. This is the context in which the authors consider Christian pandemic ethics, and this calls for a shift of focus away from pandemic ethics to what we term ‘pre-pandemic ethics’

The Shareholder Wealth Effects of Delaware Litigation

We collect data on the record of every action in over one thousand cases involving public companies from 2004 to 2011 in the Delaware Court of Chancery, which is the leading court for corporate law disputes in the United States. We use these data to estimate how markets respond to Delaware litigation events and characteristics such as case initiations, procedural motions, case quality, and judge identity. We find that negative abnormal returns are associated with the filing of derivative and contract cases, but we observe little effect associated with the filing of the average merger challenge. When we include measures of case quality, we see that higher quality cases increase the expected impact of derivative and contract litigation on firm value. We also develop evidence that tactics associated with multijurisdictional litigation are associated with a weakened impact of litigation on firm value. This evidence is consistent with the belief that the presence of litigation in another jurisdiction allows defense lawyers to bid down competing groups of plaintiffs’ lawyers during settlement negotiations. Finally, we show that abnormal returns are not associated with information on judicial assignment at the time of case filing, nor are they associated with judge identity at case resolution. These results suggest that the judicial impact on shareholder wealth at the time of judicial assignment and the time of case termination is too small to be statistically detected

Observational Analysis of the 27 May 1997 Central Texas Tornadic Event. Part II: Tornadoes

The 27 May 1997 central Texas tornadic event has been investigated in a two-part observational study. As demonstrated in Part I, the 1D environment associated with this event was unfavorable for significant (≥F2) tornadoes. Yet, the storm complex produced at least six significant tornadoes, including one rated F5 (the Jarrell, Texas, tornado). The purpose of this article is to examine the spatiotemporal interrelationships between tornadoes, preexisting boundaries, antecedent low-level mesocyclones, convective cells, and midlevel mesocyclones. It is shown that each of the six observed tornadoes that produced greater than F0 damage formed along the storm-generated gust front, not along preexisting boundaries. Half of these tornadoes formed on the distorted gust front, the portion of the storm-generated gust front whose orientation was deformed largely by the horizontal shear across the cold front. The remaining three tornadoes developed at the gust front cusp (the persistent gust front inflection located at the northeast end of the gust front distortion). Unlike the tornadoes south of the gust front cusp, these tornadoes are found to be associated with antecedent mesocyclones located in the low levels above the boundary layer. Furthermore, these mesocyclonic tornadoes are found to be larger and more destructive than the three nonmesocyclonic tornadoes. The formation of the Jarrell tornado is found to occur as a nearly stationary convective cell became collocated with a south-southwestward-moving low-level mesocyclone near the gust front cusp—a behavior that resembles the formation of nonsupercell tornadoes. It is argued that the back-building propagation/maintenance of the storm complex enabled this juxtaposition of convective cells with vorticity along the distorted gust front and may have therefore enabled tornado formation. Each of the convective cells without midlevel mesocyclones was found to remain farther from the boundaries than the mesocyclonic cells. Since the cells nearest to the boundaries were longer lived than the remaining cells, it is argued that cells near the boundaries were mesocyclonic because the boundaries yielded cells that were more likely to support temporally coherent midlevel rotation