Dendrite orientation in aluminum magnesium alloys

Aluminum magnesium alloys comprise an important class of alloys often used in the automotive, aerospace, and marine industry because of their low density and good corrosion resistance. These parts are often produced by a casting processing; creating microstructures, most commonly dendrites, that can affect the properties of the material. Critical experiments have been carried out on the Al-Mg system in order to understand how dendrite growth direction varies with composition. Through experimental studies under steady state growth, critical compositions at which the transition in preferred growth direction occurs were examined. The orientations of the resulting dendrites were measured using orientation imaging microscopy (OIM). OIM data showed the primary dendrite trunk was not affect by the change in magnesium composition keeping a (100) orientation throughout. However, there was transition in the secondary dendrite arm orientation from (100) to a (110) that occurred around 15 - 20 wt. % Mg. Though the OIM data suggests only a (100) primary dendrite trunk orientation, at some compositions a 60y angle between the dendrite trunk and side arms was also observed indicating a (110) primary dendrite trunk and (110) secondary arms

Where do we grow from here?

This poster will present the evolution of digital collections at the Regis University Library, highlighting the successes and failures along the way and outlining strategies for future growth

Who Will Own the Mazama? Tribal Power and Forest Ownership in the Klamath Basin

Through the case study of a 90,000-acre section of forest called the Mazama Tree Farm (Mazama), this manuscript explores several dynamics within the State of Jefferson, notably (1) the changing power of Native American tribes relative to other landowners and (2) the transition in rural land uses from productivism toward post-productivism. The Mazama was part of the Klamath Reservation until tribal termination in 1954, when it was purchased by an industrial landowner. The loss of the reservation coincided with the nadir of tribal power within the State of Jefferson, but more recent developments may return the Mazama to tribal ownership as a result of renewed tribal power and the diminishing role of industrial forestry in the region

Concert recording 2019-04-06

[Track 1]. Inno a Diana [Track 2]. Morire? Canto d\u27anime / Giacomo Puccini -- [Track 3]. Cinq mélodies populaires Grecques / Maurice Ravel -- [Track 4]. Quis non posset, from Stabat Mater / Franz Joseph Haydn -- [Track 5]. Hat dich die Liebe berürht / Joseph Marx -- Kling!... op. 48, no. 3 / Richard Strauss -- [Track 6]. Climb every mountain (Sound of music)

Reforming WTO-civil society engagement

Civil society organizations are often seen as playing a crucial role in helping to mitigate the exclusion of weaker states, giving voice to marginalized communities, and raising environmental and developmental concerns within the trade system. The politicization and demystification of the global trade agenda by civil society also opens up space for a more diverse set of actors to influence trade negotiations. This article examines the evolution of the WTO secretariat's engagement with civil society within this context and argues that the dominant mode of engagement, as manifest in WTO Public Forums and civil society participation in ministerial conferences, is no longer fit for purpose. Rather it reflects an outmoded strategy that once served to underscore the existence and value of the WTO as an international organization and works to neutralize political contestation and publicly promote the benefits of free trade. It is now in need of reform

Workout for the average joe

As an athlete on the Iowa State crosscountry team, I run a minimum of 70 miles each week. I’m also a member of the track team, so that treasured “off” season so many athletes talk about — yeah, I’ve never experienced one of those. With yearlong training and competing, I needed a go-to workout that is ideal for off days from practice, or on busy days when school and life got the best of me

What kind of civil society? The changing complexion of public engagement at the WTO

Since the WTO’s creation its relationship with civil society has changed significantly. In this article, we use an original dataset to: (i) plot the changes that have taken place in civil society group representation at the WTO Public Forum; and (ii) assess the significance of these changes for understandings of public interactions with the WTO. We test four hypotheses drawn from prevalent claims made in the academic and policy-facing literatures: (i) that the volume of participation in the Public Forum is determined by the ebb and flow of WTO-centered trade politics, with participation levels peaking during moments of crisis and falling away during times of stasis; (ii) that the stalling of the multilateral trade agenda has led to business interests turning away from the WTO; (iii) that the participation of NGOs in the Public Forum is also sensitive to the rhythms of trade politics; and (iv) that governments – particularly those from the global North – have begun to lose interest in the WTO and shifted attention to other arenas. We find support for hypotheses one and three but not for two and four. We subsequently analyze whose voices are heard at the Public Forum and find that there has been a narrowing of the arena of trade debate over time

A Performance Effectiveness Model for the Assessment of Anxiety\u27s Effect on Muscle Activation in Trumpet Players

The purpose of this research study is to analyze the relationship between anxiety and muscle activation in undergraduate trumpet players. sEMG will be used to measure three muscle groups: the upper trapezius, sternoclidomatoid, and masseter. This data will be analyzed along with State Trait Anxiety Inventory anxiety reports of each subject, and with VAS data of perceived anxiety after performing the repeated playing trials. Through covariate data obtained from the anxiety reports and an anxiety-induction experimental protocol, we hope to discover what effect anxiety will have on general muscle activation and fatigue in trumpet players. We hypothesize that subjects with higher anxiety levels will display greater levels of muscle activation and fatigue over the course of playing the trumpet as compared to subjects with lower anxiety levels. Preliminary data analysis has shown that there is no significant difference in VAS scales between the anxiety-induced group and the control group; the rest of the data analysis is still in progress.https://scholarscompass.vcu.edu/uresposters/1085/thumbnail.jp

Fish mouths as engineering structures for vortical cross-step filtration

Suspension-feeding fishes such as goldfish and whale sharks retain prey without clogging their oral filters, whereas clogging is a major expense in industrial crossflow filtration of beer, dairy foods and biotechnology products. Fishes\u27 abilities to retain particles that are smaller than the pore size of the gill-raker filter, including extraction of particles despite large holes in the filter, also remain unexplained. Here we show that unexplored combinations of engineering structures (backward-facing steps forming d-type ribs on the porous surface of a cone) cause fluid dynamic phenomena distinct from current biological and industrial filter operations. This vortical cross-step filtration model prevents clogging and explains the transport of tiny concentrated particles to the oesophagus using a hydrodynamic tongue. Mass transfer caused by vortices along d-type ribs in crossflow is applicable to filter-feeding duck beak lamellae and whale baleen plates, as well as the fluid mechanics of ventilation at fish gill filaments