War, Memory, and National Identity in the Hebrew Bible

Drawing on the intriguing interdisciplinary research on war commemoration, the book shows that war pervades the pages of the Bible because its authors were engaged in an effort to forge a corporate identity for Israel, one that can both transcend deep divisions within the population and withstand military conquest by imperial armies

Drought effects on biofuel feedstock production by Populus trichocarpa

As the world population continues to increase, so does the need for sustainable sources of fuel. Biofuels are of particular interest and could be an economically feasible fuel source given the right conditions. Populus trichocarpa, is a rapidly growing plantation species that, in addition to having a fully sequenced genome available for study, displays a wide range of phenotypic traits among genotypes. By analyzing these differences in both plantation and more controlled greenhouse settings, we aimed to discover which genotypes performed the best under drought conditions, and which physiological mechanisms granted them that high performance. In the field, differences in heights and stress tolerance among genotypes were observed, and 60 genotypes of differing water-limitation resistance were selected for further measures. No differences between resistance groups were seen in the physiological measures taken, yet the more resistant genotypes had higher stress tolerances indices and grew taller than susceptible genotypes from similar latitudes. The greenhouse study confirmed the water-limitation resistance rankings for 80% of the genotypes and found that resistant genotypes expressed greater midday stomatal control, enabling them to conserve water. Despite this temporary shutdown to photosynthesis, resistant genotypes assimilate carbon at a higher rate than the susceptible genotypes and can maintain their growth advantage. The quick response rate to water-limited conditions correlates with latitude and water availability of the collection site for the clones, suggesting that clones that do not regularly experience water-limitation are more sensitive to it and are able to make short-term adaptations to avoid such conditions. Further evaluation will be needed to examine if these short-term adaptations can maintain growth over extended periods of drought or on marginal lands in order for these genotypes to be a viable candidate for a rotational crop used for biofuel production

Astrophysical Insights into Radial Velocity Jitter from an Analysis of 600 Planet-search Stars

Radial velocity (RV) detection of planets is hampered by astrophysical processes on the surfaces of stars that induce a stochastic signal, or "jitter," which can drown out or even mimic planetary signals. Here, we empirically and carefully measure the RV jitter of more than 600 stars from the California Planet Search sample on a star by star basis. As part of this process, we explore the activity–RV correlation of stellar cycles and include appendices listing every ostensibly companion-induced signal we removed and every activity cycle we noted. We then use precise stellar properties from Brewer et al. to separate the sample into bins of stellar mass and examine trends with activity and with evolutionary state. We find that RV jitter tracks stellar evolution and that in general, stars evolve through different stages of RV jitter: the jitter in younger stars is driven by magnetic activity, while the jitter in older stars is convectively driven and dominated by granulation and oscillations. We identify the "jitter minimum"—where activity-driven and convectively driven jitter have similar amplitudes—for stars between 0.7 and 1.7 M⊙ and find that more-massive stars reach this jitter minimum later in their lifetime, in the subgiant or even giant phases. Finally, we comment on how these results can inform future RV efforts, from prioritization of follow-up targets from transit surveys like TESS to target selection of future RV surveys

Military crimes

Concerned with Israel’s history and future, the Bible devotes considerable space to war—the most powerful catalyst of change in the lives of nations. The biblical authors often display a consciousness of illicit activities in wartime, anticipating what we would call today “war crimes” or “military crimes.” And they also produced the first known examples of written laws of war. While the so-called Code of Hammurabi from Mesopotamia contains stipulations for soldiers, it is concerned with methods of conscription, military discipline, and concerns of soldiers’ families—yet not conduct on the battlefield. Ancient cultures from the Aegean and Western Asia, however, do reflect a general sense of what one deemed to be “lawful” conduct for armies. In some places they even moved in the direction of formal law. Setting a precedent for later international law and war conventions, some ancient Greek city-states formed interstate leagues (“amphictyonies”) and took oaths that they would not destroy each other’s cities (and especially their municipal water sources). Similarly, in the fifth book of Plato’s Republic, Socrates argues for the necessity of a law sanctioning Hellenic armies that lay waste to arable land. In the Hebrew Bible, we find an even more deliberate effort to define and depict what actions are permissible and forbidden in wartime

Solving Potential Scattering Equations without Partial Wave Decomposition

Considering two-body integral equations we show how they can be dimensionally reduced by integrating exactly over the azimuthal angle of the intermediate momentum. Numerical solution of the resulting equation is feasible without employing a partial-wave expansion. We illustrate this procedure for the Bethe-Salpeter equation for pion-nucleon scattering and give explicit details for the one-nucleon-exchange term in the potential. Finally, we show how this method can be applied to pion photoproduction from the nucleon with $\pi N$ rescattering being treated so as to maintain unitarity to first order in the electromagnetic coupling. The procedure for removing the azimuthal angle dependence becomes increasingly complex as the spin of the particles involved increases.Comment: 15 pages, 4 figure

The InfraRed Imaging Spectrograph (IRIS) for TMT: Reflective ruled diffraction grating performance testing and discussion

We present the efficiency of near-infrared reflective ruled diffraction gratings designed for the InfraRed Imaging Spectrograph (IRIS). IRIS is a first light, integral field spectrograph and imager for the Thirty Meter Telescope (TMT) and narrow field infrared adaptive optics system (NFIRAOS). We present our experimental setup and analysis of the efficiency of selected reflective diffraction gratings. These measurements are used as a comparison sample against selected candidate Volume Phase Holographic (VPH) gratings (see Chen et al., this conference). We investigate the efficiencies of five ruled gratings designed for IRIS from two separate vendors. Three of the gratings accept a bandpass of 1.19-1.37 {\mu}m (J band) with ideal spectral resolutions of R=4000 and R=8000, groove densities of 249 and 516 lines/mm, and blaze angles of 9.86 and 20.54 degrees, respectively. The other two gratings accept a bandpass of 1.51-1.82 {\mu}m (H Band) with an ideal spectral resolution of R=4000, groove density of 141 lines/mm, and blaze angle of 9.86{\deg}. We measure the efficiencies off blaze angle for all gratings and the efficiencies between the polarization transverse magnetic (TM) and transverse electric (TE) states. The peak reflective efficiencies are 98.90 +/- 3.36% (TM) and 84.99 +/- 2.74% (TM) for the H-band R=4000 and J-band R=4000 respectively. The peak reflective efficiency for the J-band R=8000 grating is 78.78 +/- 2.54% (TE). We find that these ruled gratings do not exhibit a wide dependency on incident angle within +/-3{\deg}. Our best-manufactured gratings were found to exhibit a dependency on the polarization state of the incident beam with a ~10-20% deviation, consistent with the theoretical efficiency predictions.Comment: Proceedings of the SPIE, 9147-34