Pit Features: A View From Grand Island, Michigan

Serving a multitude of functions from subterrestrial cavities of storage, basins for cooking, to vessels that securely hold pounds of rice allowing the grains to be danced upon to thresh, pit features are one of North Americas most common archaeological feature. These constructions are dug to fit a diversity of needs based on the people who manufacture them. By understanding the distinct function(s) a pit or group of pit features played at a site-level, the needs of the people who inhabited that landscape are better understood. The nature of a pit feature is to store something or process a food resource that is of value, by virtue of the objects pits once contained, those materials are predominantly reclaimed from the pit when it was in use. This lack of associated material remains found in the archaeological record make it difficult to understand the activates associated with these features. Recorded pit features of the lower peninsula of Michigan have contained varying floral remains, charred wood, burned soils, fire-cracked rocks, and limited amounts of ceramics and lithics. A considerable amount of regional ethnohistoric accounts demonstrates the importance of pit features in the subsistence and settlement patterns of native Upper Great Lakes groups. Despite these accounts, and high frequencies in which these features manifest throughout the region, there have been no formal archaeological investigations into pit feature use in the Upper Peninsula of Michigan. To address this regional gap in research, archaeological investigation of selected pit features at the Muskrat Point site (03-910) was conducted under the direction of the Grand Island Archaeological Project in the summer of 2017. Field survey identified 24 surface depressions, likely to be pit features along the southern end of Grand Island eastern lobe. Fifteen of these are located in the area of the Muskrat Point site, four of these surface depressions were excavated, each confirmed to be pit features. A performance-based approach is used to consider pit stratigraphy, macrobotanical remains, radiocarbon dating, and other contextual evidence in order to investigate pit feature function at this coastal Lake Superior site. This research acts as an initial step towards understanding the rolls pit features played in Native American lifeways of the Upper Peninsula of Michigan

Evaluating the Solar Thermal Energy Recapture Capabilities of a Thermoelectric Tie-in Device

In this study, the energy conversion efficiency of a thermoelectric device was evaluated when paired with a solar thermal system. This application to a real-world solar hot water system was compared to a previously prepared mathematical model of the systems performance. The comparison between theoretical and real-world values is likely due to the small temperature gradient and the inefficiencies inherent in the system\u27s design. It is hoped that this work can result in a less expensive hybrid roof system to further the adoption of alternative energy in the residential sector. Further work will attempt to minimize the effects of efficiency losses

Turbulent boundary-layer heat transfer from rapidly accelerating flow of rocket combustion gases and of heated air

Turbulent boundary layer heat transfer from fast accelerating flow of rocket exhaust gases and heated ai

Clinical review: Oxygen as a signaling molecule

Molecular oxygen is obviously essential for conserving energy in a form useable for aerobic life; however, its utilization comes at a cost - the production of reactive oxygen species (ROS). ROS can be highly damaging to a range of biological macromolecules, and in the past the overproduction of these short-lived molecules in a variety of disease states was thought to be exclusively toxic to cells and tissues such as the lung. Recent basic research, however, has indicated that ROS production - in particular, the production of hydrogen peroxide - plays an important role in both intracellular and extracellular signal transduction that involves diverse functions from vascular health to host defense. The present review summarizes oxygen's capacity, acting through its reactive intermediates, to recruit the enzymatic antioxidant defenses, to stimulate cell repair processes, and to mitigate cellular damage

KELT-22Ab: A Massive, Short-Period Hot Jupiter Transiting a Near-solar Twin

We present the discovery of KELT-22Ab, a hot Jupiter from the KELT-South survey. KELT-22Ab transits the moderately bright (V∼11.1) Sun-like G2V star TYC 7518-468-1. The planet has an orbital period of P = 1.3866529±0.0000027 days, a radius of R_P = 1.285^(+0.12)_(−0.071) R_J, and a relatively large mass of M_P = 3.47^(+0.15)_(−0.14) M_J. The star has R⋆ = 1.099^(+0.079)_(−0.046) R⊙, M⋆ = 1.092^(+0.045)_(−0.041) M⊙, T_(eff) = 5767^(+50)_(−49) K, log g⋆ = 4.393^(+0.039)_(−0.060) (cgs), and [m/H] = +0.259^(+0.085)_(−0.083), and thus, other than its slightly super-solar metallicity, appears to be a near solar twin. Surprisingly, KELT-22A exhibits kinematics and a Galactic orbit that are somewhat atypical for thin disk stars. Nevertheless, the star is rotating quite rapidly for its estimated age, shows evidence of chromospheric activity, and is somewhat metal rich. Imaging reveals a slightly fainter companion to KELT-22A that is likely bound, with a projected separation of 6” (∼1400 AU). In addition to the orbital motion caused by the transiting planet, we detect a possible linear trend in the radial velocity of KELT-22A suggesting the presence of another relatively nearby body that is perhaps non-stellar. KELT-22Ab is highly irradiated (as a consequence of the small semi-major axis of a/R⋆ = 4.97), and is mildly inflated. At such small separations, tidal forces become significant. The configuration of this system is optimal for measuring the rate of tidal dissipation within the host star. Our models predict that, due to tidal forces, the semi-major axis of KELT-22Ab is decreasing rapidly, and is thus predicted to spiral into the star within the next Gyr

Earthworm richness in no-till sites in Paraguay.

ISEE 10

Characterizing the Rigidly Rotating Magnetosphere Stars HD 345439 and HD 23478

The SDSS III APOGEE survey recently identified two new $\sigma$ Ori E type candidates, HD 345439 and HD 23478, which are a rare subset of rapidly rotating massive stars whose large (kGauss) magnetic fields confine circumstellar material around these systems. Our analysis of multi-epoch photometric observations of HD 345439 from the KELT, SuperWASP, and ASAS surveys reveals the presence of a $\sim$0.7701 day period in each dataset, suggesting the system is amongst the faster known $\sigma$ Ori E analogs. We also see clear evidence that the strength of H-alpha, H I Brackett series lines, and He I lines also vary on a $\sim$0.7701 day period from our analysis of multi-epoch, multi-wavelength spectroscopic monitoring of the system from the APO 3.5m telescope. We trace the evolution of select emission line profiles in the system, and observe coherent line profile variability in both optical and infrared H I lines, as expected for rigidly rotating magnetosphere stars. We also analyze the evolution of the H I Br-11 line strength and line profile in multi-epoch observations of HD 23478 from the SDSS-III APOGEE instrument. The observed periodic behavior is consistent with that recently reported by Sikora and collaborators in optical spectra.Comment: Accepted in ApJ

An Efficient Algorithm for Optimizing Adaptive Quantum Metrology Processes

Quantum-enhanced metrology infers an unknown quantity with accuracy beyond the standard quantum limit (SQL). Feedback-based metrological techniques are promising for beating the SQL but devising the feedback procedures is difficult and inefficient. Here we introduce an efficient self-learning swarm-intelligence algorithm for devising feedback-based quantum metrological procedures. Our algorithm can be trained with simulated or real-world trials and accommodates experimental imperfections, losses, and decoherence