Search for excited electrons through γγ\gamma\gamma scattering

We study the potential of $\gamma \gamma$ option of future high energy linear $e^{+}e^{-}$ colliders to search for excited electrons with spin-1/2. We calculate single production cross sections, give the angular distributions and $f-m^*$ contour plots for $\sqrt{s}=0.5$ TeV and $\sqrt{s}=3$ TeV both using the standard (tree level) couplings and anomal couplings.Comment: 10 pages, 6 figures, accepted for publication in PR

Preparation and characterization of mesoporous carbons using a Turkish natural zeolitic template/furfuryl alcohol system

The template carbonization method was utilized for the production of mesoporous carbons using a Turkish natural zeolite as a template. The major carbon precursor used was furfuryl alcohol. Furfuryl alcohol was polymerized and carbonized between 700 °C and 1000 °C in the channels of the natural zeolite. The structure of the zeolite template and carbons were investigated by surface analysis techniques, scanning electron microscopy, 13C NMR and FTIR spectrometry, and powder X-ray diffraction. At the micrometer level, the carbon material templated with the natural zeolite had the same morphology as the zeolite. The porous carbon samples contained 9199% C and minor amounts of oxygen. While the surface area of the carbon produced without templation was only 18 m2/g, the surface area of the carbons produced within the template was found to be in the range of 400800 m2/g. Average pore diameter of the porous carbons was measured as ca. 510 nm, demonstrating presence of mesoporous framework in the carbons. The 13C NMR and FTIR spectra revealed that the carbons produced in the carbonization range of 7001000 °C contained some hydrogen and oxygen containing functional groups. The XRD results put forward indications to the presence of turbostratic structures and preservation of the structural regularity of the zeolite over extended distances in the carbons

Structural aspects of AlPO4-5 zeotypes synthesized by microwave-hydrothermal process. 1. Effect of heating time and microwave power

AlPO4-5 with AFI structure containing 12-membered rings was prepared using the aluminum isopropoxide precursor as a source of alumina and TEA as the structure directing agent via microwave technique. The influence of microwave power and heating time on the dimensions of AlPO4-5 crystals formed in the system Al2O3:P2O5:(C2H5)3N (or (C3H7)3N):H2O:HF has been studied systematically. It was found that the morphology of the AlPO4-5 depended on the microwave power and heating time. Several mechanisms of fast crystallization existed in the microwave radiation, due to increased dissolution of the gel by lonely water molecules in almost temperature gradient-free and convection-free in situ heating

Anomalous WWgamma couplings in gamma-proton collision at the LHC

We examine the potential of pp-> p gamma p -> p W q X reaction to probe anomalous WWgamma couplings at the LHC. We find 95% confidence level bounds on the anomalous coupling parameters with various values of the integrated luminosity. We show that the reaction pp -> p gamma p -> p W q X at the LHC highly improve the current limits.Comment: 12 pages,3 figure

Development of UAS-Based Construction Stormwater Inspections & Soil Loss Model

Erosion and sediment control practices on construction sites provide vital protection for the environment, minimizing the impact from sediment-laden runoff associated with construction activities. Federal, state, and local regulations require regular inspections of erosion and sediment control practices to ensure their performance is adequate. This study developed an innovative approach to stormwater inspections and design guidance by integrating tools and guidance into aerial stormwater inspection outcomes. Aerial inspections were integrated with photogrammetry, geospatial information systems, and deep learning-based object detection applications to assist in performing inspections and develop site plans, hydrologic analyses, practice detection, and soil loss modeling. Orthomosaic views were used for creating site plans and developing object detection data sources. Digital Surface Models (DSMs) were developed as datasets for evaluating the performance of the E&SC practices on site. These surface models were used for running hydrologic analyses and developing soil loss models. The use of DSMs improves stormwater inspections and design approaches since DSMs serve as datasets for evaluating design efficiency with the incorporation of aerial inspection outcomes. Trial inspections were performed at the U.S. highway 30 construction site in Tama County, Iowa. Preliminary results were prepared to demonstrate a comprehensive framework for aerial inspections in future studies. This research introduces aerial inspections as an effective method to streamline inspection procedures. This could be in the form of using fewer inspectors, providing better record keeping, having faster inspection procedures and developing efficient outcomes to evaluate the performance of practices. The study highlights the potential for this technology and developed approaches to be used in the construction industry

Potential Impacts of Climate Change on Photochemistry of \u3ci\u3eZostera Marina\u3c/i\u3e L.

Seagrasses account for approximately 10% of the ocean’s total carbon storage, although photosynthesis of seagrasses is carbon limited at today’s oceanic pH. Therefore, increasing atmospheric CO2 concentration, which results in ocean acidification/carbonation, is predicted to have a positive impact on seagrass productivity. Previous studies have confirmed the positive influence of increasing CO2 on photosynthesis and survival of the temperate eelgrass Zostera marina L., but the acclimation of photoprotective mechanisms in this context has not been characterized. This study aimed to quantify the long-term impacts of ocean acidification on photochemical control mechanisms that promote photosynthesis while simultaneously protecting eelgrass from photodamage. Eelgrass were grown in controlled outdoor aquarium tanks at different aqueous CO2 concentrations ranging from ~50 to ~2100 μM from May 2013 to October 2014, and compared for differences in optical properties and photochemistry. Even with daily and seasonal variations of temperature and light, CO2 enrichment consistently increased plant size, leaf thickness and chlorophyll use efficiency, and decreased pigment content and the package effect while maintaining similar light harvesting efficiency. These CO2 responses resembled high light acclimation suggesting a common photosynthetic sensory function, such as redox regulation, controls long-term acclimation of leaf morphology. Laboratory incubations resolved this mutual regulation of redox state via carbon and light availability, by measuring O2 production, total CO2 uptake and fluorescence of the acclimated leaves. The morphological acclimations due to CO2 enrichment were facilitated by improved photosynthetic capacity. Increasing CO2 availability, relative to oxygen concentrations, maximized chlorophyll specific photosynthesis to its physiological limits at pH 6.2 by minimizing photorespiration, and increased the light requirement to saturate photosynthesis. The instantaneous increase of photosynthesis up to 8 fold reduced the role of alternative electron pathways and non-photochemical quenching for photoprotection, therefore increasing quantum yield of oxygen production. These findings explained how seagrasses resist photodamage in shallow high light environments, while maintaining long daily period of light-saturated photosynthesis to compensate carbon limitation and sustain growth. The quasi-mechanistic models generated by this study provide a pathway for including the photoprotection and photoacclimation processes in understanding the dynamic response of seagrasses to fluctuating coastal environments and climate change