Salinity in the South Platte Basin

Presented at the 2008 Central Plains irrigation conference on February 19-20 in Greeley, Colorado.An abstract of the paper presented

Thermal selection in Sceloporus occidentalis during exercise recovery

Ectotherms regulate body temperature (Tb) primarily through behavioral interactions with their environment. These animals also have limited aerobic scopes and must rely on anaerobic metabolism to support intense activity; lactate byproduct and glycogen depletion are two consequences of anaerobic metabolism that must be dealt with during exercise recovery. It has been suggested that, in many ectothermic species, Tb may affect the rate of lactate clearance and glycogen repletion during recovery from intense exercise. This study investigated thermoregulatory behavior in Western Fence Lizards (Sceloporus occidentalis) to determine preferred Tb during exercise recovery. I hypothesized that animals would select higher Tb’sduring the recovery period on the basis that biochemical processes occur at faster rates at high temperatures, which may facilitate a more rapid reduction of lactate and replenishment of glycogen stores. However, it was found that control animals maintained a constant Tb of 33°C, while exercised animals cooled Tb to 30°C 20 minutes after exercising, and eventually warmed to 32°C by the 2 hour mark. Animals were found to be able to cool Tb by a maximum of 0.175°C/min given the available temperatures, which negated possible effects of temperature variation on Tb during exercise trials and transport. My results suggest a benefit of lowered Tb to facilitate exercise recovery in these animals. Behavioral hypothermia in S. occidentalis may be caused by physiological triggers associated with intense activity such as hypoxia, hypercapnia, or elevated blood lactate concentration. However, these speculations must be confirmed by further research

Bounding film drainage in common thin films

A review of thin film drainage models is presented in which the predictions of thinning velocities and drainage times are compared to reported values on foam and emulsion films found in the literature. Free standing films with tangentially immobile interfaces and suppressed electrostatic repulsion are considered, such as those studied in capillary cells. The experimental thinning velocities and drainage times of foams and emulsions are shown to be bounded by predictions from the Reynolds and the theoretical MTsR equations. The semi-empirical MTsR and the surface wave equations were the most consistently accurate with all of the films considered. These results are used in an accompanying paper to develop scaling laws that bound the critical film thickness of foam and emulsion films

Interpreting as Ideologically-Structured Action: Collective Identity between Activist Interpreters and Protesters

In this paper, I explore the work of the American Sign Language-English interpreters who volunteered in the 1988 Deaf President Now protest (DPN). Drawing from the construct of ideologically-structured action (Dalton 1994; Zald 2000), I frame the interpreters’ decisionmaking throughout the protest, showing how their beliefs about and relationships with deaf people shaped their actions. Further, I argue that the activist interpreters exhibited a collective identity (Polletta and Jasper 2001) with the deaf protesters, despite not being deaf themselves. I also discuss the integral role of interpreters to the protesters’ mission of challenging the existing power structure. To develop my argument, I analyze interview data collected from 27 DPN stakeholders to explore how and why the interpreters volunteered their time to push the protest forward. The data reveal strong personal and community relationships that motivated interpreters to volunteer their services. Through my analysis of interview data, I offer an exploration of the work of signed language interpreters in a specific localised setting, providing new insight into how ideology and community ties may guide the actions of interpreters in times of conflict and activism in deaf community settings

Service Learning during the COVID-19 Pandemic: A Model of Temporal, Spatial, and Cultural Adaptability

In this study, the researchers analyze the progress of undergraduate and graduate ASL/English interpreting students (n = 34) in service learning courses during the COVID-19 pandemic. The study was an exploratory investigation of student adaptability and approaches to collaboration with the Deaf community amidst the global crisis. Using student assignments as the primary data source, the analysis yielded five themes that contextualized student growth throughout their service learning journeys: outlook, approach, effort, focus, and locus of control. Further, the findings are framed within the concepts of habitus and boundary work, resulting in a model of temporal, spatial, and cultural adaptability that conceptualizes student experience. Taken together, the data indicate that service learning activities and coursework continue to offer mutually beneficial opportunities to students and community partners even amidst challenging circumstances

Tests of the efficiency of steam separators

Citation: Whipple, James Halley and Seaton, Roy A. Tests of the efficiency of steam separators. Senior thesis, Kansas State Agricultural College, 1904.Morse Department of Special CollectionsIntroduction: Unless steam is passed through a superheater after it leaves the boiler,it will carry with it a certain amount of entrained water. The violent ebulition in the boiler throws more or less water up in the steam space as spray,and some of this is carried along with the steam. Besides this,there is a certain amount of water in the steam caused by condensation in the pipes before it reaches the place where it is to be used. This water increases the initial condensation in the cylinder,and if there is a great deal of it present,may cause the cylinder heads to be blown out. To get rid of,so called "Steam Separators" are used. These depend for their action upon the fact that the water is several hundred times as heavy as the steam,and when the direction of flow of the steam is quickly changed,the inertia of the water carries it on out of the path of the steam into a chamber where it can be drawn off. Ribbed plates called baffles are usually used to collect the water and direct its flow

Optimal control of motorsport differentials

Modern motorsport limited slip differentials (LSD) have evolved to become highly adjustable, allowing the torque bias that they generate to be tuned in the corner entry, apex and corner exit phases of typical on-track manoeuvres. The task of finding the optimal torque bias profile under such varied vehicle conditions is complex. This paper presents a nonlinear optimal control method which is used to find the minimum time optimal torque bias profile through a lane change manoeuvre. The results are compared to traditional open and fully locked differential strategies, in addition to considering related vehicle stability and agility metrics. An investigation into how the optimal torque bias profile changes with reduced track-tyre friction is also included in the analysis. The optimal LSD profile was shown to give a performance gain over its locked differential counterpart in key areas of the manoeuvre where a quick direction change is required. The methodology proposed can be used to find both optimal passive LSD characteristics and as the basis of a semi-active LSD control algorithm