E/V Nautilus EM302 Multibeam Echosounder System Review

Introduction The E/V Nautilus undertook leg NA040 to perform a review of the vessel’s Kongsberg EM302 multibeam echosounder in the vicinity of the continental shelf break offshore of St. Petersburg, Florida, from May 4-9, 2014 (Fig. 1). Paul Johnson and Kevin Jerram provided logistical and technical support for data collection and analysis. This report: • Describes the data collected. • Provides an overview of the processing methods used on the data • Presents the EM302 system performance for accuracy and coverage over the expected operational depth range. • Documents changes made to the system configuration prior to the 2014 field season. • Plots the EM302 transducer impedance data to document transducer health

The implementation and validation of improved landsurface hydrology in an atmospheric general circulation model

Landsurface hydrological parameterizations are implemented in the NASA Goddard Institute for Space Studies (GISS) General Circulation Model (GCM). These parameterizations are: (1) runoff and evapotranspiration functions that include the effects of subgrid scale spatial variability and use physically based equations of hydrologic flux at the soil surface, and (2) a realistic soil moisture diffusion scheme for the movement of water in the soil column. A one dimensional climate model with a complete hydrologic cycle is used to screen the basic sensitivities of the hydrological parameterizations before implementation into the full three dimensional GCM. Results of the final simulation with the GISS GCM and the new landsurface hydrology indicate that the runoff rate, especially in the tropics is significantly improved. As a result, the remaining components of the heat and moisture balance show comparable improvements when compared to observations. The validation of model results is carried from the large global (ocean and landsurface) scale, to the zonal, continental, and finally the finer river basin scales

Soybean Aphid Aphis glycines Population Responses to Bean Leaf Beetle Certoma trifurcata Management, 2004

Our objectives for 2004 was to address the compatibility of current soybean pest management programs used in Iowa and refine the preliminary recommendations. Our primary question was how bean leaf beetle Certoma trifurcata management may affect soybean aphids

Soybean Aphid Aphis glycines Control Response to Insecticide Coverage in South Central Iowa, 2004

We investigated the importance of insecticide coverage as it relates to tank mixes of insecticides with postemergent herbicides. Glyophosate is applied to reduce drift, with low pressure and large droplet size. We refer to this as a herbicide best practice (HBP), which is different from how insecticides should be applied for maximum aphid control. An insecticide best practice (IBP) would be an application with high pressure and small droplet size. We also compared insecticides of different classes alone and in combination. Pyrethroids have a longer residual activity, while organophosphates tend to kill more quickly. Combining these may improve efficacy

Soybean Aphid Aphis glycines Matsumura (Homoptera: Aphididae) Insecticide Performance in Floyd County, Iowa

In 2005 the soybean aphid reached economic populations in many Iowa counties, and a frequent question of growers was “What product offers the highest level of soybean aphid control under Iowa conditions?” To help answer this question we established a replicated field experiment at the Northeast Research Farm located in Floyd County, IA

Student Camera Use in Synchronous Classrooms: A Two-Study Exploration of CTML’s Embodiment Principle

Two studies were conducted to ascertain whether or not the embodiment principle of the Cognitive Theory of Multimedia Learning would apply to student’s use of cameras in synchronous online instruction. Results from a cross sectional dataset indicate that students who utilize their cameras report more positive outcomes than students who do not utilize their cameras. Results from a quasi-experimental design indicate that students do not report any significant differences between experiencing classes where their peers keep their cameras-on or when their peers keep their cameras-off

Nonlocalized modulation of periodic reaction diffusion waves: The Whitham equation

In a companion paper, we established nonlinear stability with detailed diffusive rates of decay of spectrally stable periodic traveling-wave solutions of reaction diffusion systems under small perturbations consisting of a nonlocalized modulation plus a localized perturbation. Here, we determine time-asymptotic behavior under such perturbations, showing that solutions consist to leading order of a modulation whose parameter evolution is governed by an associated Whitham averaged equation