9,696 research outputs found

    How does one do a Practice-Based PhD in Filmmaking?

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    This paper seeks to explore the issues raised by the process of engaging in a practice-based PhD in Filmmaking. As a sole practitioner the screenwriting doctoral student is able to explore her practice through the development of a screenplay, but what of the potential doctoral students who may wish to explore their specialist and professional filmmaking practices but who are unable to operate as sole practitioners, because of the collaborative requirements of the professional filmmaking model. Using the experience of the screenwriting doctoral investigation, and particularly the exploration of the relationship between methodology, exegesis and the creative artefact, we explore a potential model that would enable all filmmaking specialists to engage in doctoral research. Art students engaging in practice-based doctoral research do so in an environment formed by Government requirements that demand cultural, environmental and economic impacts as well as a methodology that to a large extent is formed by social science measures of value. Using this framework as a starting point we attempted to identify a suitable model that would enable filmmakers to undertake practice-based doctoral research

    New method for photoresist stripping

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    Vacuum dehydration of negatively working photoresist eliminates trace contamination of conventional stripping methods. The semiconductor substrate is coated with photoresist, exposed, developed, cured, and etched, and then placed in a vacuum. Following dehydration, the resist film is removable with ordinary solvents

    A Data-Driven Regional Model of Stomatal Conductance for Kruger National Park

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    Stomata are the gateway between the lithosphere, the biosphere, and the atmosphere. Because of photosynthesis, plants inevitably lose water through their stomata. The rate at which water moves through stomata is stomatal conductance. As stomatal conductance increases, the rate of CO2 assimilation increases, therefore, plants must reach a balance between acquiring CO2 and losing H2O. Plants achieve this balance by adjusting stomatal aperture. Therefore, modeling stomatal conductance is important to global circulation models and land surface models, as well as for predicting how changing climate conditions affect water use efficiency and plant productivity, and has implications for agriculture and natural resource management. Here a large dataset of field measurements was used to describe stomatal conductance for Kruger National Park, South Africa and develop statistical models of landscape-level stomatal conductance. Then models were used to estimate stomatal conductance across the region over several growing seasons. Over 8,000 measurements of stomatal conductance were made in four sites that represented a range of precipitation regimes and soil types within Kruger National Park from 2007-2012. Known environmental drivers of stomatal conductance, such as soil moisture, temperature, and shortwave radiation, were also measured during this period. Observed mean daytime stomatal conductance for the park was 75 ± 1 and 155 ± 2 mmol m-2 sec1 for grasses and woody plants, respectively. When statistical models were used to produce three years of continuous estimates of gs from environmental data, average daytime stomatal conductance was estimated as 67 and 158 mmol m-2 sec-1 for grasses and woody plants, respectively. The Random Forest statistical models that were used to produce continuous estimates of gs indicated that soil moisture, particularly at shallow depths, and plant species identity are primary drivers of landscape-scale stomatal conductance for Kruger National Park. However, results indicate that there is still a large amount of landscape-scale variability in stomatal conductance that the environmental drivers investigated here were unable to explain. Results provide a rare example of landscape-level estimates of stomatal conductance based on direct measurements. The models give insight into the relative importance of environmental drivers and the nature of their effect on stomatal conductance in savanna ecosystems. Because the measurements were collected over a range of species and soil conditions, the models should provide inference for many deciduous, sub-tropical savannas of southern Africa

    Probabilistic Risk Analysis and Margin Process for a Flexible Thermal Protection System

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    Atmospheric entry vehicle thermal protection systems are margined due to the uncertainties that exist in entry aeroheating environments and the thermal response of the materials and structures. Entry vehicle thermal protections systems are traditionally over-margined for the heat loads that are experienced along the entry trajectory by designing to survive stacked worst-case scenarios. Additionally, the conventional heat shield design and margin process offers very little insight into the risk of over-temperature during flight and the corresponding reliability of the heat shield performance. A probabilistic margin process can be used to appropriately margin the thermal protection system based on rigorously calculated risk of failure. This probabilistic margin process allows engineers to make informed aeroshell design, entry-trajectory design, and risk trades while preventing excessive margin from being applied. This study presents the methods of the probabilistic margin process and how the uncertainty analysis is used to determine the reliability of the entry vehicle thermal protection system and associated risks of failure

    Persistent Severe Hyperkalemia in a Patient with Normal Renal Function

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    Case Report A 75-year-old female with a past medical history significant for hypertension, hyperlipidemia, and colon cancer, status post colectomy with ileostomy, presented to the Methodist Hospital emergency room with muscular low back pain, which began a few hours prior, after abruptly bending over. Upon arrival to the hospital, she had no other complaints and noted that the back pain was starting to resolve without intervention. In triage, her heart rate was measured at 38 beats per minute (BPM) with her other vital signs within normal limits. Her electrocardiogram (EKG) was read as a junctional rhythm with a rate of about 40 BPM, and a wide-complex QRS with what appeared to be a new Right Bundle Branch Block morphology. Previous EKGs, including one from less than a year earlier, were unremarkable. Basic laboratory studies, which returned while the patient was in the ER, revealed a potassium of 7.8 mmol/L with a creatinine of 1.0 mg/dL. Her other labs were unremarkable

    Effectiveness of intervention with visual templates targeting tense and plural agreement in copula and auxiliary structures in school-aged children with complex needs: a pilot study

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    This pilot study aims to evaluate the effectiveness of a school-based intervention using visual strategies for improving accurate use of auxiliary and copula marking in singular and plural, past and present tense by students with moderate learning disability and complex needs. Eleven students, aged 10–14 years, in a specialist school based in the UK, participated in the study. A within participants design was used which included testing at baseline, pre- and post-intervention to consider progress with intervention as compared with progress during a baseline period of similar length. The experimental intervention consisted of eight, bi-weekly, 20 minute sessions, over a four week period, in small groups, in a classroom setting. Half of the participants focused on the auxiliary and half on the copula, but all were tested on both. Techniques included the use of visual templates and rules (the Shape CodingTM system) to support explicit instruction. Eight participants made greater progress during the intervention term than during the baseline term and this was significant at a group level (d = 0.92). A comparison of progress to zero was not significant during the baseline period (d = 0.15) but was during the intervention period (d = 1.07). Progress also appeared to generalise from the targeted to non-targeted structure. This pilot study therefore provides preliminary evidence that older students with complex needs can make progress with morphology when intervention includes explicit instruction and visual templates and that generalisation may be observed
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